CN101099044A

CN101099044A - Turbo fan and air conditioner

Info

Publication number: CN101099044A
Application number: CNA2006800017595A
Authority: CN
Inventors: 池田尚史; 枝吉敦史; 铃木一隆; 柴山胜己; 中岛浩
Original assignee: Mitsubishi Electric Corp
Current assignee: Mitsubishi Electric Corp
Priority date: 2005-10-06
Filing date: 2006-10-04
Publication date: 2008-01-02
Anticipated expiration: 2026-10-04
Also published as: EP2980414A1; EP2980414B1; WO2007040236A1; JPWO2007040236A1; JP4559472B2; JP2010216486A; EP1933040B1; ES2589903T3; ES2800055T3; CN100559031C; EP1933040A4; EP1933040A1; JP5121887B2

Abstract

A turbo fan comprising a main shroud and blades which are integrally formed by use of a thermosetting resin. The turbo fan having high reliability in strength and capable of reducing noise includes the disk-like main shroud (2), a hub (2a) for installing a motor in a space formed by projecting the center part of the main shroud (2) in the direction of a rotating axis, the plurality of blades (3) having a base part formed of the outer peripheral side flat plate part of the main shroud (2) and vertically installed in the projected direction of the hub (2a), and a plurality of motor cooling holes (5) formed in the hub (2a) and communicating with the space in which the motor is disposed. To form the hub (2a), the thermosetting resin is poured into a plurality of hub runners (9a) radially formed in the hub (2a). The motor cooling holes (5) are so disposed as to avoid resin converging parts (A) formed between the adjacent hub runners (9a).

Description

Turbofan and air conditioner

Technical field

The present invention relates to a kind of by thermoplastic resin formed turbofan with carried the air conditioner of turbofan.

Background technique

Prior art guarantee the rigidity of turbofan by thermoplastic resin formed turbofan with rib, thereby reduce wall thickness, realize lighting, this rib constitutes (for example, with reference to patent documentation 1) by the runner of the resin that injects.

In addition, by on the cross part of blade and mainboard, recess being set, can reduce material, (for example, with reference to patent documentation 2) reduces cost.

In addition, the sectional shape of a plurality of blades is formed from housing towards the mainboard similar shape of thickening gradually, and reduce gradually from housing towards mainboard each blade in abutting connection with distance, thereby at the blow-off outlet of turbofan, beginning to blow out by mainboard on the discharge eddy current of air-flow generation time from housing poor, prevent noise resonance etc., realize low noiseization (for example, with reference to patent documentation 3).

In addition, also have such structure, that is, blade-shaped is become the blade-shaped hollow, that vane thickness is big, the distortion when shortening the hardening by cooling time when being shaped and preventing hardening by cooling is crooked, and reduces plastic materials (for example, with reference to patent documentation 4).

Patent documentation 1: No. 3131625 communique of Japan Patent (the 3rd, 4 page, Fig. 1, Fig. 3)

Patent documentation 2: Japan is real open flat 4-116698 communique (the 1st page, Fig. 1)

Patent documentation 3: No. 3544325 communique of Japan Patent (the 7th～9 page, Fig. 5, Fig. 6)

Patent documentation 4: Japan is real open flat 4-116699 communique (the 1st page, Fig. 1)

In the turbofan of the patent documentation 1 of prior art, be provided with rib, this rib double as is the runner that is used for the reinforcing part of thin-walled property of mainboard and resin, can improves formability, but when being shaped, the weakened of the resin fluidic junction that the resin that flows out from rib converges.That is, the position of leaving the cardinal principle same distance from adjacent rib becomes the resin fluidic junction, in this part weak strength.In this existing device, be provided with by the blade front end nearby and the blade front end side rib that radially extends, by the blade rearward end nearby and towards the blade rear end side rib that radially extends, connect the connection rib and the blade strengthening rib of blade front end side rib and blade rear end side rib, for these ribs from 1 resin inlet injection resin.

When the resin that injects from the resin inlet flows to each rib, on blade front end side rib and blade rear end side rib, press radially flowing of rotating center side and outer circumferential side towards both direction, flow towards direction at the connection rib place, flow towards the direction opposite with connection rib at blade strengthening rib place with radial component and circumferential component.That is, cross a plurality of ribs that extend towards radially from the resin flow that 1 inlet injects, the resin that flows out from this rib is in contact with one another, forms the resin fluidic junction.The resin fluidic junction also be formed at and the resin that flows out from the resin inlet of adjacency between, so as turbofan integral body, resin fluidic junction quantity is many, the intensity of turbofan improves limited.In addition, the hole of a plurality of motor cooling usefulness is set near the protuberance of the mainboard the running shaft usually, by cooling off the occasion in hole as the motor of low intensive opening portion, intensity further reduces in above-mentioned resin fluidic junction.For example,, then will crack, connect, then have the problem of the crack propagation that produces as this low intensive part in motor cooling hole, its peripheral resin fluidic junction if turbofan is applied when transporting etc. the impact of the direction that is parallel to running shaft.In addition, in the structure of this runner, also there is the part that extends to the fan outer circumference end in the resin fluidic junction, and the crackle that produces in the resin fluidic junction extends to outer circumference end easily and produces and break the problem that exists quality of product to descend.

In addition, the structure that recess is set on the cross part of blade and mainboard has been shown in patent documentation 2, in this structure, when turbofan is rotated, generation is flowed along the mainboard surface, behind the bight R of the upstream side of the mobile disengaging recess on this mainboard surface, collide the bight R of downstream side, there is the problem that produces extraordinary noise by pressure oscillation.

In addition, in the turbofan shown in the patent documentation 3, because blade is not hollow structure, and, there is significantly thickness difference at each position of blade, so each position at blade during shaping produces the temperature difference.For this reason, mobile inequality causes the local thin wallization (to call shrinkage cavity in the following text) of cavity generation, wall thickness, the problem that exists formability to worsen.In addition,, compare, need more resin, fan weight and cost to uprise with the blade of hollow shape because blade integral is formed by resin.In addition, accompany therewith, it is heavy that the air conditioner of lift-launch also becomes, and has the problem of worker's carrying difference.

In addition, the centrifugal cutter that is recorded in patent documentation 4 forms the big hollow blade of vane thickness, but vane thickness is when excessive, and the air of fan dwindles by area, so, the possibility that exists the increase by wind speed to cause noise to increase.In addition, the blade profile vertical with running shaft is all identical, extracts the occasion of blade when carrying out injection moulding from forming die, does not have pattern draft, exists resin to be attached to forming die and the danger of ftractureing.

Summary of the invention

The present invention makes in order to eliminate problem as described above, its purpose is to obtain a kind of like this turbofan and has carried the air conditioner of this turbofan, this turbofan is by improving by the formability of thermoplastic resin formed turbofan and improving intensity, fragmentation in the time of can preventing to carry etc., the reliability height.

In addition, purpose is to obtain to realize the turbofan of low noiseization and carried the air conditioner of this turbofan.

Turbofan of the present invention is characterised in that: have the wheel hub of discoid mainboard, convex, a plurality of blade, motor cooling hole, a plurality of wheel hub runner, reach the resin fluidic junction; The wheel hub of this convex forms towards the running shaft direction is outstanding by the central part that makes above-mentioned mainboard; These a plurality of blades are base portion with the outer circumferential side plat part of above-mentioned mainboard, establish towards the projected direction of above-mentioned wheel hub is upright; This motor cooling hole is provided with a plurality of on above-mentioned wheel hub, and the motor that is disposed in the convex space that above-mentioned wheel hub surrounds is cooled off; These a plurality of wheel hubs with runners on above-mentioned wheel hub with radial setting, thermoplastic resin flowed into and form above-mentioned wheel hub; This resin fluidic junction is by forming with the above-mentioned thermoplastic resin contact that runner flows out from adjacent above-mentioned wheel hub when the above-mentioned shaping; Above-mentioned motor cooling hole disposes in the mode of avoiding above-mentioned resin fluidic junction.

According to the present invention, because the resin fluidic junction is not connected with motor cooling hole, so, can prevent that fan is with respect to impact and fragmentation.For this reason, has the effect that can improve intensity, obtain the high turbofan of reliability.

Description of drawings

Fig. 1 is plan view (Fig. 1 (a)) that the turbofan of embodiments of the present invention 1 is shown and the explanatory drawing of watching from the side (Fig. 1 (1b)).

Fig. 2 is the perspective view that the turbofan of embodiments of the present invention 1 is shown.

Fig. 3 is the explanatory drawing that the turbofan of embodiments of the present invention 1 is shown.

Fig. 4 is for amplifying the explanatory drawing of the turbofan that embodiment of the present invention 1 is shown.

Fig. 5 relates to embodiments of the present invention 1, is the explanatory drawing in H1-H2 line cross section that Fig. 4 is shown.

Fig. 6 relates to embodiments of the present invention 1, and the explanatory drawing in the O-O1-O2-O3 cross section among Fig. 1 (b) is shown for amplification.

Fig. 7 relates to embodiments of the present invention 1, is the flow chart of forming process that fan is shown.

Fig. 8 relates to embodiments of the present invention 1, for illustrating with respect to the plotted curve of wheel hub with the curring time (from the time that resin is injected into cooling, takes out) of the ratio t1/t0 of the minimum wall thickness (MINI W.) t0 of the other parts of the thickest t1 of runner 9a and mainboard 2.

Fig. 9 relates to embodiments of the present invention 1, for illustrating with respect to the plotted curve of blade with the curring time (from the time that resin is injected into cooling, takes out) of the ratio t2/t0 of the minimum wall thickness (MINI W.) t0 of the other parts of the thickest t2 of runner 9b and mainboard 2.

Figure 10 is the explanatory drawing that the blade of embodiments of the present invention 1 is shown, and the cross section (Figure 10 (b)) of Z-Z line of side (Figure 10 (a)), Figure 10 (a) of 1 blade of fan is shown.

Figure 11 is the explanatory drawing that the blade of embodiment of the present invention 1 is shown, and the longitudinal section of the Y-Y line of Figure 10 (b) is shown.

Figure 12 be the outside that makes blade and hollow inboard be shown upright establish the face relative rotation axi towards hollow inboard by tilt angle theta tilt, fan curring time (sec) when changing tilt angle theta and the plotted curve of noise figure (dB).

Figure 13 relates to the turbofan of embodiments of the present invention 1, for the worm's eye view of the turbofan that is shaped by other flow passage structure is shown.

Figure 14 relates to the turbofan of embodiments of the present invention 1, for the worm's eye view of the turbofan that is shaped by another flow passage structure again is shown.

Figure 15 relates to embodiments of the present invention 1, is the perspective view of the turbofan of watching another configuration example from below.

Figure 16 relates to embodiments of the present invention 1, and the part perspective view of the part of turbofan is shown for amplification.

Figure 17 is the explanatory drawing that the blade of embodiments of the present invention 1 is shown, and the cross section (Figure 17 b) of Z-Z line of side (Figure 17 (a)), Figure 17 (a) of 1 blade of fan is shown).

Figure 18 is the explanatory drawing that the blade of embodiments of the present invention 1 is shown, and is the longitudinal section (Figure 18 (a)) of the Y-Y line of Figure 17 (b) and the explanatory drawing (Figure 18 (b)) that amplification illustrates the part of Figure 18 (a).

Figure 19 relates to embodiments of the present invention 1, is the explanatory drawing of a following part that turbofan is shown.

Figure 20 relates to embodiment of the present invention 1, is the plotted curve of the relation of the noise figure of the ratio of height difference Δ t that blade the place ahead runner 9ba and blade rear runner 9bb are shown and the maximum open width diameter F of the 3b of blade openings portion of hollow structure and same air quantity.

Figure 21 relates to embodiments of the present invention 1, is the perspective view of the air conditioner watched from the room that is provided with.

Figure 22 relates to embodiments of the present invention 1, for the longitudinal section of air conditioner is shown.

Figure 23 relates to embodiments of the present invention 1, for the horizontal sectional view of air conditioner is shown.

Embodiment

Mode of execution 1

The turbofan (hereinafter to be referred as fan) of embodiments of the present invention 1 is described with reference to the accompanying drawings.

Fig. 1 (a) cuts a part of housing and represents blade for to watch the plan view of the turbofan of present embodiment from case side.The explanatory drawing of Fig. 1 (b) for watching from the side of Fig. 1 (a), towards figure, left-half is the longitudinal section that side, right half part illustrate the O-O1-O2-O3 of Fig. 1 (a).In addition, Fig. 2 be present embodiment fan below, i.e. perspective view from watching with the housing opposition side.

As depicted in figs. 1 and 2, fan 1 is made of discoid mainboard 2, and the central part of mainboard 2 constitutes towards the outstanding convex of running shaft direction, configuration motor (not shown) in the space that is surrounded by protuberance.This protuberance is called wheel hub 2a.In addition, at the central part of wheel hub 2a, be that the central part of mainboard 2 forms projection 2c, at this partial fixing motor reel.The part that motor is set is called the fan outer side of mainboard 2, for example 7 blade 3 of multi-disc is set at the outer circumferential side plat part of the fan private side of side in contrast.In order to ensure intensity, the part that is connected in projection 2c of mainboard 2 is provided with wheel hub top heavy section 2d, forms thicker than the wall thickness t0 of the plane of inclination of wheel hub 2a.

In addition, blade 3 is the hollow shape of bag shape,, establishes towards the projected direction of wheel hub 2a is upright from the 3b of blade openings portion of this base portion as base portion with the outer circumferential side plat part of mainboard 2.At base portion, between all side end 3a and the blade outer circumferential side end 3c, the center line 3a-3c of the 3b of blade openings portion and the radius of mainboard 2 are pressed predetermined angle, for example ground of the angle of intersection about 45 ° configuration to the 3b of blade openings portion in blade.In addition, as Fig. 1 (a), with make with respect to running shaft circumferential installation pitch angle σ 1, σ 2, σ 3 ... the mode that σ 7 becomes the unequal pitch of at least a portion disposes a plurality of blades 3.In Fig. 1 (a), σ 1=σ 4＜σ 3=σ 6=σ 7＜σ 2=σ 5 for example.

Fan 1 is that the center rotates towards arrow D direction by motoring with rotating center O.Housing 4 like that, is located at the periphery of fan 1 shown in Fig. 1 (b), from the upper fixed of Fig. 1 (b) on each blade 3.

Near wheel hub 2a, form the inner air channel 6 of fan by housing 4 and mainboard 2 with clamping, on the wheel hub 2a of a side that disposes motor, constitute fan outer side air channel 7.On wheel hub 2a, around rotating center O, have the motor cooling hole 5 that constitutes by a plurality of openings in the position of leaving rotating center O cardinal principle equidistance, be communicated with inner air channel 6 of fan and fan outer side air channel 7.In Fig. 1 (a), motor cooling hole 5 for example is provided with 7, is configured to respectively on the straight line O-3a that connects interior all side end 3a of 1 blade and rotating center O.Here, the circumferential installation pitch angle γ 1 in a plurality of motor cooling hole 5, γ 2, γ 3 ... γ 7 is also same with blade 3, forms in the mode that becomes the different irregular pitch of at least a portion.Here, make motor cooling hole 5 circumferential installation pitch angle γ 1, γ 2, γ 3 ... γ 7 is same with the circumferential installation pitch angle σ of blade 3, for example γ 1=γ 4＜γ 3=γ 6=γ 7＜γ 2=γ 5.

Mainboard 2 and blade 3 are for example integrally formed by thermoplastic resins such as ABS, ASG (being designated hereinafter simply as resin).In Fig. 2, symbol 10 is near the wheel hub 2a and the joggling part between the par of mainboard 2 for the vestige of the resin inlet that is used to inject resin when shaping mainboard 2 and blade 3, and is in the blade of par near all side end 3a, be called resin inlet 10 here.In addition, on fan, be formed on the runner 9 that becomes resin channels when being shaped, in forming die, for becoming the part that makes resin pass through space bigger on thickness direction, ground easily than the major component of mainboard 2, but in the finished product fan, the hardening of resin of runner 9 is and residual, and the minimum wall thickness (MINI W.) t0 of the part beyond the runner of wall ratio mainboard 2 is big.

1 of runner 9 wheel hub runner 9a that forms wheel hub when being shaped.This wheel hub for example is provided with 7 with radial with runner 9a on wheel hub 2a, extend from resin inlet 10 towards rotating center O, does not radially stretch out with straight line shape across with other runner before near the motor cooling hole 5 along fan.Wheel hub is thicker than the minimum wall thickness (MINI W.) t0 on the plane of inclination of wheel hub 2a with runner 9a, be made as predetermined wall thickness t1 (＞t0).Nearby dispose motor cooling hole 5 at wheel hub with fan center's side end of runner 9a, near the opposing party's the fan outer circumferential side end of wheel hub, dispose all side end 3a in the blade of blade 3 with runner 9a.In addition, the wheel hub of straight line shape with the width direction center line 11 of runner 9a disposing by the mode on the motor cooling hole 5, all side end 3a in the blade, resin injection portion 10, wheel hub with runner 9a, and motor cooling hole 5 be that starting point disposes respectively towards the mode on the roughly straight line of radially extension to be positioned at rotating center O.In the present embodiment, be irregular pitch owing to establish the circumferential installation pitch angle σ of blade 3, so motor cooling hole 5, wheel hub are pressed irregular pitch with respect to rotating center O similarly with runner 9a and resin inlet 10 and constituted.When the installation pitch angle σ of blade 3 for equating the occasion of pitch, motor cooling hole 5, wheel hub are with pitches such as runner 9a, the circumferential installation pitch angle that reaches resin inlet 10 become similarly.

In addition, at outer circumferential side plat part as the mainboard 2 of the base portion of hollow shape blade 3, with blade with runner 9b be formed at the 3b of blade openings portion around.For by making resin flow into the runner that forms blade 3 when being shaped, 9a is same with wheel hub usefulness runner with runner 9b for blade, and is thicker than the wall thickness t0 of the outer circumferential side plat part of mainboard 2, be made as regulation wall thickness t2 (＞t0).Connect runner 9c and use the runner of runner 9b with runner 9a and blade for connecting wheel hub.Connect runner 9c for example constituting with the same wall thickness t1 of runner 9a with wheel hub, for width than wheel hub with runner 9a and blade with the little runner of runner 9b.

When fan 1 when the D direction is rotated, by housing 4 ambient air is guided to blade 3, be drawn into the inboard of housing 4, by the inner air channel 6 of fan, shown in the arrow E 1 of Fig. 2, between the blade 3 of fan periphery, blow out like that.At this moment, the inner air channel 6 of fan is in a ratio of negative pressure with the fan external air channel 7 that motor is installed.Therefore, as Fig. 1 (b), as shown in Figure 2, while by the motor that is communicated with the inner air channel 6 of fan and 7 of fan external air channel cool off hole 5, a part of E2 of the air-flow that blows out from fan 1 with the rubbing action of wheel hub 2a under rotate and flow into fan external air channel 7.Then, flow to the inner air channel 6 of fan of negative pressure by motor cooling hole 5.In fan external air channel 7 sides that surround by wheel hub 2a, wheel hub 2c, with fan 1 dispose motor regularly, by air-flow E2 cool motors.

When by the integrally formed turbofan that constitutes like this of resin, in the forming die in space, inject resins from a plurality of resin inlets 10 with fan-shaped.The resin that injects from resin inlet 10 is guided by the runner 9 as the bigger part of wall thickness, flows in the fan integral body, and mainboard 2 and blade 3 are integrally formed.Fig. 3 is for watching the explanatory drawing of fan from below.Wheel hub is to be located at from center side end 9a1 to the runner the fan outer circumferential side end 9a2 with runner 9a, motor cooling hole 5 be disposed at the side end 9a1 of fan center near, in the blade all side end 3a be disposed at fan outer circumferential side end 9a2 near.

The part of resin at wheel hub with after flowing among the runner 9a, flow to mainboard wheel hub 2a, form this part.In addition, another part flows to blade runner 9b from connecting runner 9c, flows to the mainboard 2 of blade 3 and blade 3 peripheries, forms this part.The resin flow of this moment is illustrated by the arrow B of Fig. 3.Resin flows out to forming die by each runner 9 as arrow B, the resin that flows out from adjacent fluid channels 9 leave runner 9 substantially equidistances the contact of resin fluidic junction and converge.By dotted line A this resin fluidic junction is shown.

Resin inlet 10 injects back importing wheel hub and uses the resin of runner 9a radially successfully to flow by unidirectional towards rotating center O.In addition, use the resin that flows among the runner 9a to flow with runner 9a, formation resin fluidic junction A between adjacent wheel hub is with runner 9a towards adjacent wheel hub at wheel hub.Motor cooling hole 5 disposes in the mode of avoiding resin fluidic junction A, so, be formed at motor cooling hole 5 resin fluidic junction A nearby and be not attached to motor cooling hole 5, but be formed between the adjacent motor cooling hole 5.

Resin fluidic junction A is not connected to the motor cooling hole 5 as the opening low with respect to impact strength, so, can prevent to be connected to the crackle that motor cools off hole 5 and resin fluidic junction A, can improve the intensity of the fan 1 of shaping.Therefore, though when transporting etc. the running shaft direction of fan 1, the additional impact of above-below direction of for example Fig. 1 (b), just in case crack, also can prevent the radially extension of the crackle that produces at the periphery in motor cooling hole 5 towards mainboard 2.Like this, fan 1 fragmentation can be prevented, reliability can be improved with respect to the impact of fan 1.

Particularly in the present embodiment, cool off hole 5 on the elongation line of wheel hub with runner 9a, thereby can positively avoid near formation resin fluidic junction A motor cooling hole 5 by motor is set.

In addition, runner 9 is not the structure of intricately branch, but is branched off into wheel hub with runner 9a be connected such 2 directions of runner 9c at resin inlet 10, becomes the blade of both direction runner 9b at connection runner 9c and blade with the joint branch of runner 9b.As described above and since resin fluidic junction A intensity a little less than, so, preferably reduce with doing one's utmost or shorten quantity, the length of the resin fluidic junction A of formation.In the structure of the runner 9 of present embodiment, can't help to form resin fluidic junction A mutually from the resin that 1 resin inlet 10 injects, but the part formation resin fluidic junction A that contact with the resin that injects from adjacent resin inlet 10.For this reason, integral body can reduce the quantity of resin fluidic junction A.Like this, can constitute runner 9 more simply, the easy longshore current of resin road 9 flows, and can reduce the generation of shrinkage cavity, improves formability.

In addition, in the fan of present embodiment, A is as being shown in broken lines for the resin fluidic junction, and an end in contact is radially extended by court between the adjacent motor cooling hole 5 in projection 2c, and the other end is contacted with the central authorities of blade 3.Reach in this wise in the formation of outer circumference end at resin fluidic junction A as prior art, when when resin fluidic junction A cracks, crack growth has the possibility of cutting apart cut-out to the outer circumference end of fan 1.And in this embodiment, be formed at the outer circumferential side end of the resin fluidic junction A of mainboard 2, be contacted with blade and constitute with runner 9b ground.For this reason, can shorten the resin fluidic junction A that is formed at mainboard 2, the position that can shorten weak strength, thus can obtain the high fan 1 of reliability of intensity.In addition, when transporting etc., even crack near resin fluidic junction A, just in case crackle enlarges along resin fluidic junction A, the outer circumferential side end of resin fluidic junction A also is contacted with the big blade of wall thickness runner 9b, so, stop crackle by this part.Failing to stop the occasion of crackle by blade with runner 9b, conjointly becoming strength member with runner 9b in blade 3 integral body that axially have height with blade.For this reason, can prevent that fan 1 from fully being cut apart cut-out, can improve with respect to the reliability of impacting.

The formation of resin fluidic junction A and runner 9 is described in more detail below.If as described above, so that the end in contact of resin fluidic junction A is in wheel hub 2c, radially extend by court between the adjacent motor cooling hole 5, the mode that makes the other end be contacted with the central authorities of blade 3 constitutes the sheet number form shape of blade 3 with respect to the angle of radius, the shape formation of runner 9, the position of resin inlet 10, the shaped position in motor cooling hole 5 etc., then can obtain the fan 1 high with respect to impact reliability.

Fig. 4 is for amplifying the explanatory drawing of the part that Fig. 3 is shown, and Fig. 5 is the explanatory drawing that the H1-H2 line sectional view of Fig. 4 is shown.Resin inlet 10 for example is located at the position near connection runner 9c of wheel hub with runner 9a,, 2 adjacent resin inlet 10m, 10n for example is described here.Resin inlet 10m is connected in wheel hub with runner 9am, blade runner 9bm, connection runner 9cm, injects resin from this, shaping blade 3m and its peripheral mainboard 2.On the other hand, resin inlet 10n is connected in wheel hub with runner 9an, blade runner 9bn, connection runner 9cn, injects resin from this, shaping blade 3n and its peripheral mainboard 2.The upright wall thickness of being located at the blade 3 of mainboard 2 be made as predetermined wall thickness t3 (＞t0), blade 3 on the whole substantially evenly.

Be positioned at the occasion in the place ahead of the fan sense of rotation (arrow D direction) of blade 3n at blade 3m, to be formed at 2 resin fluidic junction A between blade 3m, the 3n and to be not attached to the fan outer circumference end in order to make, as long as constitute the resin of the part that forms area L in mode by the ester moulding that injects from resin inlet 10n.Particularly, if forming near the resin of plat part 3cmt of the blade outer circumferential side end of blade 3m is not the resin that is injected by resin inlet 10m, but be the resin that injects by resin inlet 10n, then be formed at wheel hub and positively be contacted with blade 3m with the resin fluidic junction A between runner 9an, the 9am.For this reason, in the flow channel length of the resin of the plat part 3cmt that flows to blade outer circumferential side end, make to constitute runner 9 apart from the distance of resin inlet 10n than the distance of distance resin inlet 10m shortly get final product.

Specifically, sheet number form shape by setting blade 3, the shape of runner 9 constitute, the shaped position in the position of resin inlet 10, motor cooling hole 5, resin injection rate etc., for example simulate, can form at which position of fan resin fluidic junction A thereby can study when being shaped.The end in contact of the resin fluidic junction A that obtains by simulation is in projection 2c, and the wheel hub 2a by 5 in adjacent motor cooling hole, and the other end is contacted with blade runner 9b.

As described above, wheel hub 2a, a plurality of blade 3, the motor with discoid mainboard 2, convex cools off hole 5, a plurality of wheel hub runner 9a, reaches resin fluidic junction A; The central part that the wheel hub 2a of this convex makes mainboard 2 is outstanding and constitute towards the running shaft direction; These a plurality of blades 3 are base portion with the outer circumferential side plat part of mainboard 2, establish towards the projected direction of wheel hub 2a is upright; This motor cooling hole 5 is provided with a plurality of on wheel hub 2a, and the motor that is disposed in the convex space that wheel hub 2a surrounded is cooled off; These a plurality of wheel hubs are located among the wheel hub 2a with radial with runner 9a, and resin is flowed into, thereby form wheel hub 2a; This resin fluidic junction A is by forming with the resin contact that runner 9a flows out from adjacent wheel hub when being shaped; By dispose motor cooling hole 5 in the mode of avoiding resin fluidic junction A, can obtain with respect to the high turbofan of reliability of impacting.

In addition, wheel hub 2a is provided with a plurality of motor cooling holes 5 and is configured to the part of using runner 9a towards the wheel hub of rotating center O side prolongation, thereby make the low motor cooling hole 5 of relative impact strength not be connected effectively, can obtain the high fan of reliability of impact with resin fluidic junction A.

In addition, by forming wheel hub runner 9a with the radial straight line of pressing, thereby can make resin flow to the projection 2c of rotating center periphery easily, can improve formability around rotating center O.

In addition, being divided into wheel hub becomes the runner 9 of resin channels with runner 9a and blade with runner 9b ground, and the connection runner 9c that connects this runner 9a, 9b is set, in addition, and the resin inlet 10 injection resins at wantonly 1 position from be located at runner 9a, 9b, 9c.That is, flowing into wheel hub crosses with at least one square tube in the resin of runner 9b with runner 9a and blade and is connected runner 9c and flows.For this reason, can be corresponding to the width that connects runner 9c, the setting of wall thickness, adjust and flow to wheel hub with the amount of the resin of runner 9a with flow to the balance of amount of the resin of blade usefulness runner 9b.Flow to this wheel hub with runner 9a and blade injection amount by adjusting well, can prevent the thin-walled property of part of generation, the wall thickness in the cavity that mobile inequality causes, can prevent that intensity from worsening with the resin of runner 9b.

In the present embodiment, resin inlet 10 directly is located at wheel hub with among the runner 9a, but also resin inlet 10 can be located at blade with among the runner 9b.In addition, also can be located among the connection runner 9c.When on connecting runner 9c, resin inlet 10 being set, make resin inlet 10 different with wall thickness, width and resin inlet 10 and the blade of the runner between the runner 9a by resin flow with wall thickness, the width of the runner between the runner 9b with wheel hub corresponding to necessity, thus the balance of adjustable tree fat amount.

In addition, because blade 3 is formed hollow shape, blade runner 9b is set around opening 3b, so, can realize lighting by hollow shape, simultaneously, by making resin flow to forming die integral body easily when the shaping blade 3, thereby also can make blade 3 thin-walled properties, but also lighting.Can alleviate the weight of fan peripheral part with respect to the rotating center of fan 1 by lighting,, the stress that appends to as the mainboard root of the base portion of blade 3 be alleviated so the centrifugal force in the time of can making rotation reduces.As a result, can improve the intensity of fan 1, the breakage when preventing to rotate.In addition, blade with the part of runner 9b as resin residue in formed body, so the blade 3 that stress is concentrated can be increased with runner 9b by blade with the wall thickness at the joining portion of mainboard 2.Like this, can improve Resin Flow and improve formability with runner 9b by blade, and, the intensity of turbofan can be improved.

In addition, as described above, have wheel hub runner 9a, blade runner 9b, reach connection runner 9c; This wheel hub usefulness runner 9a with radial setting, flows into resin when being shaped on wheel hub 2a, form wheel hub 2a; This blade is located at around each the base portion of blade 3 with runner 9b, flows into resin when being shaped, and forms blade 3; This connection runner 9c connects wheel hub respectively with runner 9a and near the blade runner 9b that is positioned at it; Like this, runner 9 forms towards radially being connected to the periphery of mainboard 2 from the rotating center side., on the main flow direction of the resin that injects from resin inlet 10,, do not flow in the opposite direction, on one side and flow through runner 9 and flow to peripheral mainboard 2 being divided into towards the resin of rotating center with behind the resin of outer circumferential side for this reason.

Like this, the resin flow direction is fairly simple, so, can predict the part that forms resin fluidic junction A clearly.In addition, resin is successfully flowed, can improve formability, have the effect of the fan 1 that can obtain high reliability.In addition, can shorten the distance of resin fluidic junction A, can prevent that the intensity of turbofan from worsening.

In addition, with as prior art, compare by the structure of the resin-shaped resin fluidic junction of injecting from resin inlet, in this embodiment, can reduce the quantity of resin fluidic junction A, can simplify mold design, simultaneously, can prevent that the cavity that mobile inequality causes from taking place, the local thin wallization of wall thickness.

Fig. 6 is for amplifying the explanatory drawing of the part that Fig. 1 (b) is shown.Such as shown in the figure, in the fan of present embodiment, on the wall of the wheel hub 2a that constitutes fan external air channel 7, wall thickness be the wheel hub of t1 with runner 9a from the wheel hub 2a of wall thickness t0 towards fan external air channel 7 side-prominent wall thickness difference (t1-t0).Wheel hub with the elongation line of the rotating center side of runner 9a on configuration motor cooling hole 5.For this reason, wheel hub works as wind deflector with runner 9a, causes towards the air-flow G in motor cooling hole 5.Wheel hub becomes wind deflector with runner 9a with respect to air-flow G, thereby increases the air stream on the surface that flows to the motor that is configured in the part that is surrounded by wheel hub 2a, promotes the cooling of motor.Usually the temperature with respect to motor rises, and implement to stop to the such temperature protection control of motor energising when above when reaching a certain temperature, but the cooling by the promotion motor is controlled and can not turned round efficiently thereby do not implement temperature protection.In addition, also can prevent to become the breakage of the motor that high temperature causes because of motor.

Like this, wheel hub with runner 9a from the mainboard 2 of wheel hub 2a to face the fan external air channel 7 that is in the motor configurations side side-prominent, thereby can increase the air stream on the surface that flows to motor, promote the cooling of motor, have the effect of the turbofan that can obtain high reliability.

In addition, the shape of the fan of present embodiment is that the center is provided with by radial how group is cooled off groups that hole 5 constitute with runner 9b, wheel hub with runner 9a, connection runner 9c, motor by blade 3, blade with running shaft O.That is, for a blade 3, resin inlet 10, wheel hub equate with respect to all blades 3 that constitute fan 1 with the configuration in runner 9b, connection runner 9c, motor cooling hole 5 substantially with runner 9a, blade.Therefore, if inject the resin of same amounts substantially from a plurality of resin inlets 10, then can make resin towards same direction along discoid fan 1 overall flow, can form by same molding condition.For this reason, the fan of being finished by shaping can prevent on the whole by mobile uneven and cavity that cause takes place, the local thin wallization of wall thickness, has the effect of the high turbofan of the reliability that can obtain intensity.

In addition, thereby by for example making amount that circumferential pitch variation makes necessary resin with respect to respectively organizing different occasions with runner 9b, wheel hub with what runner 9a, connection runner 9c, motor cooled off that hole 5 constitutes by blade 3, blade, if make from the quantitative changeization of the resin of resin inlet 10 injections corresponding to its amount, then can form, have and above-mentioned same effect by same molding condition.

In addition, by the motor cooling hole 5 and the wheel hub runner 9a of equal number are set, thereby can make identical with respect to the motor cooling hole 5 that constitutes fan 1 with respect to the configuration relation cardinal principle of the blade 3 in motor cooling hole 5.For this reason, flow out to the turbulent E2 in the inner air channel 6 of fan from fan external air channel 7 by motor cooling hole 5, flow to the rear of blade 3, this blade 3 is by forming with the blade usefulness runner 9b that runner 9a is connected with the wheel hub near this motor cooling hole 5.That is, the 5 turbulent E2 that flow out can not flow to respectively between blade 3 and the blade 3 and directly collision mutually from motor cooling hole, so, can not be subjected to big pressure oscillation, but can obtain the turbofan of low noiseization.

Here, though the motor cooling hole 5 and the wheel hub runner 9a of equal number are set, the also comparable wheel hub of quantity in motor cooling hole 5 is few with runner 9a.For example, can be not with the rotating center O side of runner 9a motor cooling hole 5 be set at all wheel hubs yet.By position and the relative uniform position of rotating center O motor cooling hole 5 is set at the resin fluidic junction A that avoids wheel hub 2a, can obtain such turbofan, the strength reliability height of this turbofan, and can prevent that on the whole the cavity that mobile inequality causes from taking place, the thin-walled property of the part of wall thickness by molding condition shaping uniformly on a certain degree.Certainly,, can be shaped, obtain the high turbofan of reliability by uniform molding condition by the motor cooling hole 5 and the wheel hub runner 9a of equal number are set.

In addition, the shape of this fan as shown in Figure 1, with running shaft O is that the center is provided with by radial how group is cooled off groups that hole 5 constitute with runner 9b, wheel hub with runner 9a, connection runner 9c, motor by blade 3, blade, with adjacent group angulation in, differently constitute at least 1 angle with other angle.Like this, can prevent to be discharged to outside turbulent E2 from motor cooling hole 5 and to have periodically from the air-flow E1 that blade 3 blows out.For this reason, can prevent the noise that the rotating speed of fan causes, keep quietness acoustically.

By be the center like this with the running shaft by radial be provided with many groups by blade 3, blade with runner 9b, wheel hub with runner 9a, connect runner 9c, reach motor and cool off the group that hole 5 constitutes, with respect to 1 blade 3, make the configuration in resin inlet 10, wheel hub runner 9a, blade runner 9b, motor cooling hole 5 identical substantially, so, can make molding condition identical, can prevent that the cavity that mobile inequality causes from taking place, the thin-walled property of the part of wall thickness, can obtain the high turbofan of reliability of intensity.

In addition, in the group that constitutes with runner 9a, connection runner 9c, motor cooling hole 5 with runner 9b, wheel hub by blade 3, blade, by with the formed angle of adjacent group in, differently constitute at least 1 angle with other angle, can obtain to reduce anti noise.

In addition, if by with the identical quantity of runner 9a motor cooling hole 5 being set with wheel hub, then can make motor cooling hole 5 identical with the configuration relation of blade 3, can make from fan external air channel 7 towards fan air-flow E2 that inner air channel 6 flows out by motor cooling hole 5, waltz through and flow to the outside between the blade, can reduce noise, obtain the good effect of formability.

The forming process of fan here, is described according to Fig. 7.Fig. 7 is the flow chart that the forming process of fan is shown.Be fixed for the being shaped forming die (ST1) of fan 1 of Fig. 1～shape shown in Figure 6 injects thermoplastic resins (ST2) from resin inlet 10.The resin flow of injecting is crossed wheel hub with runner 9a, connection runner 9c, blade runner 9b, flows to mainboard 2, blade 3 from runner 9 again with expanding.Resin roughly is filled to fan integral body at number msec.Then, cool off, make thermoplastic resin sclerosis (ST3), after sclerosis fully, the fan 1 (ST4) that the demoulding and taking out has been shaped.After this, housing 4 is fixed on the suction side (ST5) of fan 1.Then, advance to the operation that motor reel etc. is installed.

Below, the wall thickness of the each several part of the resin that constitutes fan 1 is described.

As Fig. 5, as shown in Figure 6, if the minimum wall thickness (MINI W.) of the part except that runner 9 of mainboard 2 is t0, wheel hub is t1 with the wall thickness of runner 9a, and the blade that is formed at around the 3b of blade openings portion of hollow shape is t2 with the wall thickness of runner 9b, and the wall thickness of the blade 3 of hollow shape is t3.At least establish wall thickness t1, t2, t3 is thicker than wall thickness t0.Though runner 9 also has the error, the angle part that produce when being shaped to become the occasion of the shape with R, establishes the wall thickness that the wall thickness the best part is a runner 9.In addition, the wall thickness of runner 9 is such as shown in the figure, for the wall thickness that comprises mainboard 2 with from the part of the outstanding part of mainboard face.

Fig. 8 illustrates with respect to wheel hub with partly the plotted curve of curring time of ratio t1/t0 of minimum wall thickness (MINI W.) t0 beyond the runner of the wall thickness t1 of runner 9a and mainboard 2, and transverse axis is represented t1/t0, and the longitudinal axis is represented curring time (sec).Here, formation time is represented the ST2～ST4 institute's time spent in the flow chart shown in Figure 7, for be injected into the time that take out the cooling back from resin.

Such shown in the plotted curve of Fig. 8, be below 1.0, be the wheel hub occasion of the wall thickness t1 of runner 9a smaller or equal to the minimum wall thickness (MINI W.) t0 of the part beyond the runner of mainboard 2 that at t1/t0 runner 9a is a thin-walled, resin flow is poor, it is very time-consuming that resin flows to forming die integral body, and curring time increases.In addition, greatly, promptly establish the wheel hub 2 times big occasions of the wall thickness t1 of runner 9a than the minimum wall thickness (MINI W.) t0 of the part beyond the runner of mainboard 2 at t1/t0 than 2.0, the cooling of resin is very time-consuming, and the time before taking out is elongated.As a result,, then compare with the occasion of same wall thickness (t1/t0=1.0) at least, can shorten curring time if be in the scope of 1.1≤t1/t0≤2.By shortening curring time, can increase output, in addition, also can reduce the electricity charge of having spent by forming machine, can realize energy-conservation.

Fig. 9 illustrates with respect to blade with the wall thickness t2 of runner 9b and the plotted curve of the curring time of the ratio t2/t0 of the minimum wall thickness (MINI W.) t0 of the runner part in addition of mainboard 2, and transverse axis is represented t2/t0, and the longitudinal axis is represented curring time (sec).Here, formation time is represented the ST2～ST4 institute's time spent in the flow chart shown in Figure 7, for be injected into the time till take out the cooling back from resin.

Such shown in the plotted curve of Fig. 9, be below 1.0, be the blade occasion of the wall thickness t2 of runner 9b at t2/t0 smaller or equal to the minimum wall thickness (MINI W.) t0 of the part beyond the runner of mainboard 2, blade is a thin-walled with runner 9b, resin flow is poor, it is very time-consuming that resin flows to forming die integral body, and curring time increases.In addition, greatly, promptly establish the blade 2 times big occasions of the wall thickness t2 of runner 9b than the minimum wall thickness (MINI W.) t0 of the part beyond the runner of mainboard 2 at t2/t0 than 2.0, the cooling of resin is very time-consuming, and the time before taking out is elongated.As a result,, then compare with the occasion of same wall thickness (t2/t0=1.0) at least, can shorten curring time if be in the scope of 1.1≤t2/t0≤2.By shortening curring time, can increase output, in addition, also can reduce the electricity charge of having spent by forming machine, can realize energy-conservation.

Therefore, if establish wheel hub is in 1.1≤t1/t0≤2 with the ratio t1/t0 of the minimum wall thickness (MINI W.) t0 of the part except that runner 9 of the wall thickness t1 of runner 9a and mainboard 2 scope, then compare, have the effect that can shorten curring time with the occasion that constitutes by identical wall thickness (t1/t0=1).In addition, if establish blade is in 1.1≤t2/t0≤2 with the ratio t2/t0 of the minimum wall thickness (MINI W.) t0 of the part except that runner 9 of the wall thickness t2 of runner 9b and mainboard 2 scope, then compare, have the effect that can shorten curring time with the occasion that constitutes by identical wall thickness (t2/t0=1).Particularly wall thickness t1, the t2 of runner 9 is made as below 2 times of minimum wall thickness (MINI W.) t0 of mainboard 2, on the wall thickness of runner 9, the upper limit is set, thereby can shortens curring time, simultaneously, can reduce the amount of resin, can realize that also the lighting of fan 1 and cost reduce.

Here, wheel hub is put down in writing respectively with the wall thickness t1 of runner 9a and the blade wall thickness t2 with runner 9b, but the mode that can satisfy the either party constitutes, or constitute contentedly simultaneously.If constitute contentedly simultaneously, then can shorten curring time morely, respond well.

Is t with the wall thickness of runner 9a and blade with the wall thickness of at least one side in the wall thickness of runner 9b when establishing wheel hub like this, when if the minimum wall thickness (MINI W.) of the part except that runner 9 of mainboard 2 is t0, if ratio t/t0 is in the scope of 1.1≤t/t0≤2, then compare, have the effect that can shorten curring time with the occasion that constitutes by identical wall thickness (t/t0=1).

Below, the shape of blade 3 is described.

Figure 10 and Figure 11 illustrate the formation of 1 blade 3.Figure 10 and Figure 11 are the explanatory drawing that the blade 3 of present embodiment is shown, and Figure 10 (a) illustrates the side of 1 blade, and Figure 10 (b) illustrates the cross section of the Z-Z line of Figure 10 (a), and Figure 11 illustrates the longitudinal section of the Y-Y line of Figure 10 (b).

Like that, all side hollow part 3dc, blade outer circumferential side hollow part 3dd are that base portion towards blade suction side end 3e to the inboard of hollow shape tilt by arbitrarily angled θ 1, θ 2 with the 3b of blade openings portion that is located at mainboard 2 with respect to the straight line X that is parallel to running shaft in the blade of blade hollow part 3d shown in Figure 10 (a).The wall thickness of blade 3 is even substantially, so the inboard to hollow shape tilts from the 3b of blade openings portion towards blade suction side end 3e by arbitrarily angled θ 1, θ 2 with respect to the straight line X that is parallel to running shaft for all side end 3a and blade outer circumferential side end 3c in the blade.

In addition, as shown in Figure 11, with respect to the sense of rotation D of blade 3, the inboard to hollow shape tilts the blade rear hollow part 3db of the despining direction side of blade the place ahead hollow part 3da and blade 3 from the 3b of blade openings portion towards blade suction side end 3e by arbitrarily angled θ 3, θ 4 with respect to the straight line X that is parallel to running shaft.The wall thickness of blade 3 substantially evenly, so, blade the place ahead sidepiece 3f and blade rear sidepiece 3g also opposing parallel the inboard to hollow shape tilts from the 3b of blade openings portion towards blade suction side end 3e by arbitrarily angled θ 3, θ 4 in the straight line X of running shaft.

That is, blade 3 and blade hollow part 3d are made of thin head shapes, have from mainboard 2 towards housing 4 by predetermined angle theta 1, θ 2, θ 3, θ 4 towards the hollow inboard gradient that tilts.For this reason, when from the fan formed body when the running shaft direction is chosen forming die, by tilting can make the demoulding successfully of resin and forming die, can prevent that blade 3 is attached to forming die and causes blade 3 breakages, can improve formability.When the hardening by cooling of resin finishes, forming die is established face 3a, 3c, 3f blade 3 outsides of hollow shape upright, the 3g place closely is contacted with the fan formed body, simultaneously, establish face 3dc, 3dd, 3da hollow inboard upright, the 3db place closely is contacted with the fan formed body.Here, the upright face of establishing of the outside and hollow inboard all forms thin head shapes from base portion towards upright set direction.For this reason, can be in the demoulding easily of the outside of blade 3, simultaneously, can be easily in the hollow inboard demoulding of blade 3.

In addition, by blade 3 is formed hollow shape, and do not compare, can realize lighting for the occasion of hollow shape.In addition, in the even occasion that waits of the wall unevenness of blade 3, the shaping problem that generation is caused by the hardening by cooling time inequality of resin, the problem that has the formability difference, but owing to make the wall thickness of blade 3 roughly even, so, can make the hardening by cooling time of resin even substantially, can prevent the shaping problem, improve formability.

Like this, the wheel hub 2a, and the blade 3 of a plurality of hollow shapes that have discoid mainboard 2, convex; The wheel hub 2a of this convex constitutes towards the running shaft direction is outstanding by the central part that makes mainboard 2; The blade 3 of these a plurality of hollow shapes is a base portion with the outer circumferential side plat part of mainboard 2, establishes towards the projected direction of wheel hub 2a is upright, simultaneously, has opening 3b at base portion; Outer edge-on upright face 3da, 3db, 3dc, the 3dd of establishing of face 3a, 3g, 3c, 3f and hollow inboard that establish of the blade 3 of hollow shape is towards hollow inboard inclination, make the outside and the hollow inboard of blade 3 become the shape that attenuates from base portion towards front end, thereby can easily carry out the demoulding, prevent that blade 3 is attached to forming die and causes the breakage of blade 3 forming die.

In addition, even substantially by the wall thickness that makes blade 3, can make the hardening by cooling time of resin even, can obtain the good turbofan of formability.

In addition, because blade 3 is made as hollow shape, so, can make fan 1 integral lightization.

Figure 12 be make all side end 3a in the blade with respect to angle θ 1, the blade outer circumferential side end 3c of running shaft with respect to angle θ 2, blade the place ahead hollow part 3da of running shaft with respect to the tilt angle theta 3 of running shaft, blade rear hollow part 3db with respect to the tilt angle theta 4 of running shaft all by same angle θ tilt, fan curring time (sec) during the change tilt angle theta and the plotted curve of noise figure (dB), transverse axis is represented tilt angle theta, and the longitudinal axis is represented curring time (sec) and noise figure (dB).This noise figure (dB) is at the ground point measurement that leaves 2m under fan court.In addition, curring time is the time of ST2～ST4 in the flow chart that forming process shown in Figure 7 is shown.

According to diagram shows curring time shown in Figure 12.

Occasion in tilt angle theta＜0 °, blade 3 become the shape of the expansion from mainboard 2 sides towards housing 4 sides, so forming die can not the demoulding, becomes impossible formation.Occasion in θ=0 °, i.e. the occasion that does not tilt with respect to running shaft, blade 3 is big with the friction of forming die, and as the not demoulding lentamente, then blade 3 will be attached on the forming die and damaged, so, need long curring time.By relatively forming tilt angle theta with it, demould time is shortened in the demoulding easily, and in addition, the surface area of blade 3 increases, and it is big that film-cooled heat becomes, so, obtain cool time shortening.For this reason, by the formation tilt angle theta, thereby can shorten curring time.As tilt angle theta is 1 °, and then curring time is compared with the occasion at 0 ° at angle of inclination, becomes about 1/2.Therefore, if tilt angle theta is at least more than 1 °, then curring time shortens, the formability height.

Below, according to diagram shows noise figure shown in Figure 12.

In the relation of tilt angle theta and noise figure, when tilt angle theta was excessive, the stream between adjacent vanes 3 and the blade 3 narrowed down, and rose by wind speed, so noise increases.According to the measurement result of Figure 12, when tilt angle theta tilted greatlyyer than 3 °, it is big that noise becomes.For this reason, if tilt angle theta is constituted the scope of 1 °≤θ≤3 °, then can keep good noise figure.

According to above result, be in the scope of 1 °≤θ≤3 ° by establishing tilt angle theta, can obtain noise and change turbofan little and that formability is high.

Like this, upright face 3da, 3db, 3dc, the 3dd of establishing that makes that blade 3 outsides upright of hollow shape establish face 3a, 3g, 3c, 3f and hollow inboard inboardly tilts towards hollow, can obtain the effect that noise changes little and the turbofan that formability is high by making predetermined tilt angle theta be in the scope of 1 °≤θ≤3 ° respectively, having.

Here, make all side hollow part 3dc in the blade of blade, blade outer circumferential side hollow part 3dd, blade the place ahead hollow part 3da, and blade rear hollow part 3db all inboardly tilt towards hollow with respect to running shaft by identical tilt angle theta, even but, also can obtain same effect respectively by mutual different angle tilt.

In addition, all side end 3a, blade outer circumferential side end 3c in the blade, blade suction side end 3e, with respect to the blade sense of rotation be positioned at blade the place ahead sidepiece 3f in the place ahead, each wall thickness that is positioned at the blade rear sidepiece 3g at rear is wall thickness uniformly substantially on the whole at blade 3, but be not limited to this, also can be more or less different according to shaping error etc.Among all side end 3a, the blade outer circumferential side end 3c, the width of sense of rotation is little, is difficult to constitute in the same manner wall thickness in this part in blade.In the scope of change, the wall thickness of blade 3 is evenly got final product substantially with a certain degree.By constituting wall thickness equably, resin is injected equably, simultaneously, cooling equably, so, can obtain good formed body.

In addition, in the present embodiment, the central part that forms blade 3 from the base portion of mainboard 2 to the vertically upright formation of establishing of the projected direction of wheel hub 2a, make the outside of blade 3 and hollow inboard upright establish to face hollowly inboardly tilt, thereby can obtain effect as described above.In this constitutes, by by the running shaft direction and leave forming die and the demoulding with being parallel to running shaft.With respect to this, on one side for example also can on one side be that the center makes forming die how much rotate some to leave and demoulding ground constitutes in the running shaft direction and with the running shaft.In rotation and the occasion of the demoulding, blade 3 central parts for from the base portion of mainboard 2 to the vertically upright structure of establishing of the projected direction of wheel hub 2a, but make the central part of blade 3 become base portion from mainboard 2 towards the shape of blade suction side end 3e along rotating stripping demoulding direction inclination predetermined angular.Even in the occasion that forms the structure that blade 3 tilts like this, the outside by making blade 3 and hollow inboard upright established to face and hollowly inboardly tilts, and the also demoulding easily obtains and above-mentioned same effect.

Below, illustrate runner 9 is constituted the turbofan 1 that is shaped as other.Figure 13 is the worm's eye view by the turbofan 1 of another flow passage structure shaping.Among the figure, the part that the symbolic representation identical with Fig. 3 is identical or suitable.

In the drawings, the cooling hole runner 9d that forms in the mode on every side that surrounds motor cooling hole 5 is set, connects this cooling hole runner 9d and wheel hub runner 9a, the runner that forms as one.

In the turbofan that constitutes like this, the part of the resin that injects from resin inlet 10 during shaping flows with runner 9d towards cooling hole with runner 9a from wheel hub, flows towards wheel hub 2a, projection 2c again.At this moment, flow through wheel hub past 2 directions of resin branch in cooling hole is used runner 9d with runner 9a, the cooling hole around being located at motor cooling hole 5 is used among the runner 9d mobile.Flow through motor cooling hole 5 around after, promptly, positively converge again, flow to projection 2c in the projection 2c side in motor cooling hole 5.By cooling hole runner 9d is set like this, can improve the Resin Flow of motor cooling hole 5 peripheries, improve formability.

In addition, cooling hole runner 9d is set by periphery in motor cooling hole 5, make as the cooling hole around the motor cooling hole 5 of opening residual with runner 9d sclerosis, the formation heavy wall.For this reason, can improve the intensity of intensity around the motor cooling hole 5 that opening descends easily, be subjected to impacting also with respect to disrumpent feelings turbofan with durability even obtain.

Figure 14 is the worm's eye view by the turbofan 1 of another flow passage structure shaping.In the drawings, the part that identical with Fig. 3 symbolic representation is identical or suitable.

In the drawings, the wheel hub of straight line shape is connected to motor cooling hole 5 cooling hole runner 9d on every side with runner 9a, is connected to wheel hub top heavy section 2d.The rotating center side in motor cooling hole 5 becomes wheel hub top heavy section 2d, is the big part of wall thickness of the major component beyond the runner of wall ratio mainboard 2.

In the turbofan that constitutes like this, the part of the resin that flows into from resin inlet 10 during shaping flows with runner 9d towards cooling hole with runner 9a from wheel hub, flows through wheel hub top heavy section 2d again, forms this part.Identical with structure shown in Figure 13, flow through wheel hub and punish into 2 directions in cooling hole with runner 9d with the resin of runner 9a, the cooling hole around being located at motor cooling hole 5 is used among the runner 9d and is flowed.After flowing through around the motor cooling hole 5, flow towards connected wheel hub top heavy section 2d, this part is shaped.

Similarly cooling hole runner 9d is set by structure in the periphery in motor cooling hole 5 with Figure 13, make as the cooling hole around the motor cooling hole 5 of opening residual with runner 9d sclerosis, constitute heavy wall, can make the intensity intensity raising around the motor cooling hole 5 that opening descends easily.By cooling hole runner 9d is set like this, can improve formability and improve intensity by the Resin Flow that improves motor cooling hole 5 peripheries, even obtain to be subjected to impacting the turbofan that also has durability with respect to breakage.

In this structure, cooling hole is directly connected to projection nearby the wheel hub top heavy section 2d bigger than the wall thickness of wheel hub plane of inclination with runner 9d.For this reason, resin successfully flows to wheel hub top heavy section 2d, the resin that flows in runner 9d in cooling hole in the resin flows direction the place ahead in motor cooling hole 5, be that the projection 2c side in motor cooling hole 5 is positively converged again, flow to wheel hub top heavy section 2d.Therefore, cool off the cooling hole of positively to press in hole 5 at motor on every side and use the wall thickness amount of runner 9d to inject resin, can make intensity cool off hole 5 intensity raising on every side at the motor of opening decline easily as opening.

Be connected in wheel hub with runner 9a, to surround the cooling hole runner 9d that motor cooling hole 5 mode on every side forms by having like this, can obtain such turbofan, this turbofan can improve formability by the Resin Flow that improves motor cooling hole 5 peripheries, simultaneously, can improve intensity.

Below, describe blade runner 9b in detail.Figure 15 relates to this mode of execution, perspective view for the turbofan of watching other configuration example from below, Figure 16 is for amplifying the part perspective view of the part that Figure 15 is shown, Figure 17, Figure 18 are the explanatory drawing that 1 blade 3 is shown, Figure 17 (a) illustrates the side of blade 3, and Figure 17 b illustrates the cross section of the Z-Z line of Figure 17 (a).In addition, Figure 18 (a) illustrates the longitudinal section of the Y-Y line of Figure 17 (b), and Figure 18 (b) amplifies the round M part that Figure 18 (a) is shown.Figure 19 illustrates the following part of turbofan 1.

The structure of the turbofan here illustrates another configuration example that the 3b of the blade openings portion blade on every side that relates to the base portion that is formed at blade 3 is used runner 9b.

For example, in the around openings of the blade 3 of hollow shape blade runner 9b is set as Figure 15～as shown in Figure 18, use runner 9b as blade the place ahead runner 9ba in the blade of blade sense of rotation front side, use runner 9b as blade rear runner 9bb in the blade of blade sense of rotation rear side.Projecting height that the face from mainboard 2 of blade the place ahead runner 9ba is begun and the face from mainboard 2 of blade rear runner 9bb begin projecting height and form difference, and the axial projecting height of rotation of blade the place ahead runner 9ba is given prominence to towards the fan outer side than the only big specified altitude of the projecting height ground of blade rear runner 9bb.

Near the mainboard 2 of the 3b of blade openings portion, the air-flow C that fan 1 produces when the D direction is rotated meets blade the place ahead runner 9ba and lateral bending song outwardly, draws parabola, flows near mainboard 2 ground once more in blade rear side runner 9b side.Figure 16 illustrates this state enlargedly.Wherein, be the occasion of equal height at blade the place ahead runner 9ba and blade rear runner 9bb, when fan rotates, mainboard 2 mobile disengaging blade the place ahead runner 9ba nearby, then, impact the angle of blade rear runner 9bb, have the problem that produces pressure oscillation, produces noise in the herring bone district.

When making blade the place ahead runner 9ba exceed specified altitude than blade rear runner 9bb shown in Figure 18 (b) like that, near the flowing 3b of blade openings portion is mobile as the arrow C of Figure 18 (a).That is, the air-flow after breaking away from from blade the place ahead runner 9ba is drawn towards the parabola of the outside curve of mainboard 2, at the sense of rotation rear of blade rear runner 9bb once more near mainboard 2.When the height that makes blade the place ahead runner 9ba increases, air-flow C from the surface of mainboard 2 outwardly the distance left of lateral bending Qu Shicong mainboard 2 become big.As a result, the attachment point again of air-flow C moves towards the rear of blade rear opening portion 3b.Like this, be attached to the rear of blade rear opening portion 3b smoothly again, can prevent that air-flow C from impacting in the angle of blade rear runner 9bb, can realize low noiseization by making air-flow C.

In addition, because blade becomes big with the wall thickness of the place ahead runner 9ba, so, can make resin more easily flow to blade 3, can prevent shrinkage cavity, and, because the raising of the intensity at runner 9ba place, blade the place ahead, so, the intensity of fan also can be improved.

Like this, runner 9bb compares with the blade rear, making blade the place ahead runner 9ba only exceed specified altitude ground constitutes, and to constitute towards the outstanding mode of fan outer side, but thereby weight reduction, increase intensity, when rotated and also can prevent from when transporting the breakage of fan from can obtain high reliability, low noise turbofan.

Below, with respect to the maximum open diameter F of the 3b of blade openings portion of hollow structure shown in Figure 19, further specify the blade that forms peripherally that surrounds blade 3 with the blade the place ahead runner 9ba of runner 9b and the height difference Δ t of blade rear runner 9bb (illustrating) at Figure 18 (b).Wherein, maximum open width F is the inscribed circle diameter of face of the mainboard 2 of opening, and Δ t is the height difference of height and the blade rear runner 9bb of blade the place ahead runner 9ba.

When height difference Δ t hour, the air-flow that leaves blade the place ahead runner 9ba does not become the parabola with enough height, but impacts the angle of blade rear runner 9bb.For this reason, the pressure oscillation at blade openings portion 3b place causes noise to take place.On the contrary, when blade the place ahead runner 9ba too high, when promptly poor Δ t is excessive, air-flow is peeled off at blade the place ahead runner 9ba place, and the peak sound that causes because of rotating speed takes place.Like this, there is desirable scope in the height difference Δ t of blade the place ahead runner 9ba and blade rear runner 9bb.

But, cross flowing of the 3b of blade openings portion, not only relevant with the height difference Δ t of blade the place ahead runner 9ba and blade rear runner 9bb, and also also relevant with the maximum open diameter F of the 3b of blade openings portion.Therefore, calculate the ratio (Δ t/F) of the height difference Δ t of blade the place ahead runner 9ba and blade rear runner 9bb with respect to the maximum open diameter F of the 3b of blade openings portion.Figure 20 is for illustrating the plotted curve of ratio (Δ t/F) % and the relation of the noise figure (dB) of identical air quantity, and transverse axis is represented ratio Δ t/F (%), and the longitudinal axis is represented noise figure (dB).This noise figure is being measured from the position that fan leaves about 2m under the fan.

According to measurement result shown in Figure 20, constitute by mode, can obtain noise ratio blade the place ahead runner 9ba and blade rear runner 9bb, when being Δ t=0 (Δ t/F=0) low turbofan identical from the projecting height of the face of mainboard 2 with the scope that is in 4%≤Δ t/F≤22% at least.

In the occasion of Δ t/F＜4%, the relative maximum open diameter of the poor Δ t F of runner is less, and the gas shock of leaving blade the place ahead runner 9ba is big to the possibility change at the angle of blade rear runner 9bb, produces pressure oscillation, and noise takes place in the herring bone district.On the other hand, in the occasion of 22%＜Δ t/F, the poor Δ t of the projecting height of runner is bigger with respect to maximum open diameter F, leaves the air-flow of blade the place ahead runner 9ba and peels off, and the peak sound that is caused by rotating speed makes noise become big.

If like this so that poor with respect to the projecting height maximum open diameter F of the 3b of blade openings portion, blade the place ahead runner 9ba and blade rear runner 9bb, the mode that is in the scope of 4%≤Δ t/F≤22% constitutes, then when fan rotates, behind mainboard 2 flow shedding blade the place ahead runner 9ba nearby, the place, angle that can be suppressed at blade rear runner 9bb impacts, causes pressure oscillation, is suppressed at the herring bone district noise takes place.In addition, the air-flow that breaks away from behind blade the place ahead runner 9ba is moved towards the attachment point again at the sense of rotation rear of blade rear runner 9bb to opening portion 3g rear, blade rear, can adhere to again smoothly.In addition, the projecting height at blade the place ahead runner 9ba place can be not too high and produce to flow at blade the place ahead runner 9ba and peel off, and can suppress the generation of the peak sound that rotating speed causes, prevents noise penalty.Therefore, can realize low noiseization.

Therefore, turbofan constitutes by the scope ground that makes blade the place ahead runner 9ba and the ratio Δ t/F of the maximum open diameter F of the 3b of blade openings portion of the relative hollow structure of poor Δ t of the projecting height of blade rear runner 9bb be in 4%≤Δ t/F≤22%, can realize low noiseization.

Certainly, by also have the formation of said fans on the basis of the formation of runner 9b concurrently at this 3b of blade openings portion and blade, can obtain further effect.

For example, by motor cooling hole 5 is set with avoiding the resin fluidic junction, can obtain the high turbofan of strength reliability.In addition,, can make resin flow to mainboard 2 tops easily and go up near projection 2c, can improve the Resin Flow of mainboard integral body by wheel hub runner 9a is set.In addition, because blade 3 is hollow structure, so, but the lighting of turbofan integral body.In addition, because blade hollow part 3d has from mainboard 2 towards housing the 4 thin head shapes of the shaping pattern draft that tilts of angle θ in accordance with regulations,, can prevent that blade 3 is attached to mould and causes blade breakage, formability height so the demoulding of forming die is easy.In addition, owing to make the wall thickness of blade 3 roughly even, so, can make the hardening by cooling time even, thereby can prevent the generation of the shaping problem that causes owing to the inhomogeneous inequality that produces of hardening by cooling time to a certain extent.

In the present embodiment, fan constitutes a plurality of blades 3 by 7, and is corresponding therewith, and 7 runners 9 and motor cooling hole 5 is set, but the quantity in the quantity of the sheet number of blade 3, runner 9, motor cooling hole 5 also can be not limited thereto, but is several.

In addition, though the quantity that motor is cooled off hole 5 constitutes and wheel hub with the identical quantity of runner 9a, the quantity in motor cooling hole 5 is lacked with the quantity of runner 9a than wheel hub.Wherein, be disposed on the elongation line of wheel hub with runner 9a if motor is cooled off hole 5, then motor cooling hole 5 is not connected the intensity height with the resin fluidic junction.For this reason, even the occasion of lacking with the quantity of runner 9a than wheel hub in the quantity in motor cooling hole 5 is also preferably cooled off motor on the elongation line that hole 5 is disposed at wheel hub usefulness runner 9a.If reduce the quantity in motor cooling hole 5, the function reduction of cool motors then, but can improve the intensity of the wheel hub 2a of fan.

Figure 21～Figure 23 is illustrated in any configuration example of the turbofan 1 of having carried the present embodiment record on the air conditioner, Figure 21 is for being provided with the state of air conditioner on ceiling board, perspective view for the air conditioner watched from the room, Figure 22 is the longitudinal section that air conditioner is shown, and Figure 23 is the horizontal sectional view that air conditioner is shown.Here, illustrate fan 1 is equipped on example in the ceiling-embedded air conditioner for example.

Air conditioner shown in Figure 21 is embedded into the upside of ceiling board, by tetragonal decorative sheet 13 roughly towards the room 19.At near suction grid 13a and the filter 20 to by air suck grid 13a after carry out dedusting of the configuration central authorities of decorative sheet 13 as the air suction inlet that leads to the air conditioner main body.In addition, have the plate blow-off outlet 13b that forms along each limit of decorative sheet 13, in addition, on each plate blow-off outlet 13b, also have wind direction stator (wind direction ベ one Application) 13c.

In addition, such as shown in figure 22, air conditioner main body 12 with respect to room 19 with as ceiling board 12c towards be arranged on the top, ceiling board 12c around side plate 12d is installed, 19 modes with open lower side are provided with towards the room.Being disposed at the main body suction port 12a of following central part of air conditioner main body 12 and the suction grid 13a of decorative sheet 13 disposes communicatively.In addition, being disposed at main body suction port 12a main body blow-off outlet 12b and plate blow-off outlet 13b on every side disposes communicatively.In the inside of air conditioner main body 12, have fan 1, form turbofan the suction air channel horn mouth 14 and fan 1 is rotated drive electric motor 8.

In addition, between the blade that blows out part from air-flow, blow out air channel configuration heat exchanger 15 till the plate blow-off outlet 13b as fan 1.Heat exchanger 15 has aluminium fin 15a and heat-transfer pipe 15b, in accordance with regulations at interval stacked multi-disc along the short transverse of air conditioner main body 12, be the rectangular aluminium fin 15a that Vertical direction is extended, from stacked direction multilayer heat-transfer pipe 15b is connected wherein.

Such as shown in figure 23, the outer circumferential side ground that heat exchanger 15 surrounds fan 1 roughly forms C shape.At this connecting pipings 18 of collector 16 that the volume of the cooling medium that flows to each heat-transfer pipe 15b is adjusted, distributor 17 and outdoor unit is installed roughly on a side's of 2 ends of the heat exchanger 15 of C shape the heat-transfer pipe 15b.In heat-transfer pipe 15b, make for example refrigerant cycle of carbon dioxide etc.

According to the air conditioner of such formation, when turbofan 1 was rotated by sense of rotation D, the air in room 19 was subjected to dedusting by suction grid 13a, the filter 20 of decorative sheet 13, after by main body suction port 12a, horn mouth 14, is drawn into turbofan 1.Then, between the blade 3 by turbofan 1, blow out towards heat exchanger 15.Indoor air carries out heat exchange with the refrigeration agent that flows through in the heat-transfer pipe 15b, thereby carries out heat exchange, the dehumidifying of heating installation, refrigeration etc. by heat exchanger 15 time.After this, when from main body blow-off outlet 12b, plate blow-off outlet 13b towards the room 19 when blowing out, by wind direction stator 13c control wind direction.

When transporting this air conditioner, usually the running shaft direction of fan 1 vertical, be that the running shaft of fan motor 8 is vertically kept.That is, horn mouth 14 sides that are in following or air conditioner main body 12 by top body plate 12c are in following state and air conditioner main body 12 is installed on lorry etc. carry.

Be equipped on Figure 21～ceiling-embedded air conditioner shown in Figure 23 by turbofan 1, thereby have following such effect present embodiment.

That is, by improving the formability of fan 1, but thin-walled property, lighting is realized the lighting of the weight of product integral body.In addition, can improve strength reliability, so, can prevent the vibration of turbofan 1 when transporting etc. impact destroyed, even also can improve product reliability as air conditioner.

In addition, making motor cooling hole 5, blade 3 is in the turbofan 1 of unequal pitch, owing to cool off the turbulent flow of the air-flow of discharging towards the outside of fan 1 in hole 5 and do not have periodicity from the air-flow that blade 3 blows out from motor, so, can reduce the noise that the rotating speed because of fan causes, realize low noiseization.By this fan 1 is equipped on the air conditioner, flow out and the disorder that flows to the air-flow of plate blow-off outlet 13b also reduces from fan 1, so, except the noise of fan 1 obtains reducing, also can further reduce noise as air conditioner, obtain quiet air conditioner.In addition, owing under the state that the turbulent flow of air-flow is reduced, carry out heat exchange with heat exchanger 15 and refrigeration agent, so, can obtain the good air conditioner of efficient.

And, be not limited to Figure 21～ceiling-embedded air conditioner shown in Figure 23.Here, have plate blow-off outlet 13b in 4 directions of ceiling board, but also can towards both direction two plate blow-off outlet 13b be set opposite to each other.In addition, also can not be the structure that on ceiling board, embeds all air conditioner main bodys, but by being provided with from the outstanding state of ceiling board.In addition, be not limited to be arranged on the occasion of ceiling board, also can be arranged on the wall.By on the air conditioner of other formation of having carried turbofan, being suitable for the turbofan of present embodiment, with similarly above-mentioned, the fan breakage when product transports can be prevented, low noise, quality of product height, quiet, lightweight, the high air conditioner of carrying can be obtained.

By having like this by wantonly at least 1 turbofan that constitutes and the heat exchanger that are recorded in present embodiment, to carry out heat exchange from the suction port inhaled air at above-mentioned heat exchanger and refrigeration agent by above-mentioned turbofan, blow out from blow-off outlet, thereby can obtain strength reliability height, lightweight, can reduce the air conditioner of noise.

In addition, be not limited to air conditioner,, can obtain and above-mentioned same effect also applicable to the ventilation fan that has carried turbofan, air cleaner.

In addition, according to the present invention, can obtain following such effect.

Promptly, motor side side at mainboard 2 has a plurality of wheel hubs runner 9a in accordance with regulations at interval, these a plurality of wheel hubs are connected to resin inlet 10 with runner 9a, wall thickness than the plane of inclination of wheel hub 2a is big, radially stretch out towards fan with straight line shape, when being shaped, when resin flows towards the projection bigger than the wall thickness of wheel hub plane of inclination wheel hub top heavy section 2d nearby with runner 9a from above-mentioned wheel hub, resin fluidic junction A is free of attachment to the motor cooling hole 5 as opening low with respect to the intensity of impacting, but be formed between the motor cooling hole 5, so, flow to projection 2c easily, formability improves, and simultaneously, can shorten the resin fluidic junction that is created on the mainboard 2, so, impact and just in case crack, turbofan also is difficult for breaking even apply at axial (above-below direction of Fig. 1 (b)) of fan 1 when transporting etc., can improve formability and turbofan with respect to the reliability of impacting.

In addition, near the fan center side end 9a1 of wheel hub, dispose motor cooling hole 5 respectively with runner 9a, at least motor cooling hole 5 is identical with the quantity of runner 9a with wheel hub, in addition, near the fan outer circumferential side end 9a2 of above-mentioned wheel hub, dispose all side end 3a in the blade with runner 9a, above-mentioned wheel hub connects by being connected runner 9c with runner 9b with the blade that forms peripherally of the 3b of blade openings portion that surrounds blade 3 with runner 9a, so the resin fluidic junction A of the resin that flows out with runner 9a from wheel hub positively is created on motor cooling hole 5 each other.As a result, though when transporting etc. towards axial (above-below direction of Fig. 1 (b)) additional impact of fan 1 and just in case when cracking, turbofan also is difficult for breaking, can improve formability and the turbofan reliability of impact mutually.In addition, because wheel hub is not integrally formed with runner 9b with runner 9a and blade, so, can adjust wheel hub with runner 9a and blade injecting and the injection amount of the resin that flows with runner 9b from resin inlet 10, prevent that the cavity that mobile inequality causes from taking place, the thin-walled property of the part of wall thickness, prevent that intensity from worsening.In addition, with runner 9b resin is flowed easily by blade, so, also can realize the thin-walled property of blade 3, simultaneously, can increase the wall thickness at the joining portion of stress concentrated blade 3 and mainboard 2, realize simultaneously by improving the intensity that Resin Flow improves formability and improves turbofan.

In addition, because the wheel hub of adjacent straight line shape does not form mutually overlappingly with runner 9a, so, being branched off into a plurality of occasions with rib that prior art forms runners with respect to a resin inlet 10 like that compares, the main flow direction of resin is for radially, flow direction is uncomplicated, can make resin fluidic junction A clear and definite, and can reduce the quantity of resin fluidic junction A, mold design is simplified, simultaneously, can prevent that mobile inequality from causing the thin-walled property of the part of cavity generation, wall thickness, can prevent that the intensity of turbofan from worsening.

In addition, wheel hub forms towards the fan external air channel 7 of mainboard with runner 9a side-prominently, so, can cause towards the wind deflector of the mobile G in motor cooling hole 5 with runner 9a double as by wheel hub.Like this, can increase the air on the surface that flows to the fan motor of fixing by the projection 2c and the turbofan 1 of fan external air channel 7 sides that are disposed at wheel hub 2a 8, make the motor cooling become easy.Therefore, need not implement temperature protection control, also can suppress high temperature and make the motor breakage for motor temperature rises.

In addition, being located at the interior all side ends of blade resin inlet nearby connects by being connected runner with runner with the blade that forms peripherally of the mainboard outer side opening portion of the blade that surrounds hollow structure, all side hollow parts in the blade of blade hollow part, blade outer circumferential side hollow part, and hollow part surface, blade the place ahead, hollow part surface, blade rear all is the plane of inclination of arbitrarily angled θ with respect to running shaft, all side ends in the blade, blade outer circumferential side end, end, blade suction side, be in blade the place ahead sidepiece in the place ahead with respect to the sense of rotation of blade, be in each wall thickness of the blade rear sidepiece at rear, the mode of identical wall thickness forms to become substantially on blade integral, and blade and blade hollow part become thin head shapes ground and form from mainboard towards case side.Therefore, because blade is hollow structure, so, but the blade lighting, because wall thickness is roughly even, so the shaping problem that causes in the even contingent resin hardening by cooling time inequality of occasion of the wall unevenness of blade is difficult for taking place, formability is good.In addition, because blade and blade hollow part are the thin head shapes with shaping pattern draft towards housing inclination predetermined angular from mainboard, so the easy demoulding of forming die can prevent that blade is attached to mould and causes the breakage of blade, formability height.

In addition, turbofan has discoid mainboard and housing, by thermoplastic resin formed; This discoid mainboard forms the wheel hub of convex in the mode that covers motor at central part, on the wheel hub of this convex, has a plurality of motor coolings hole that is communicated with motor and fan inside, and, the central part of above-mentioned wheel hub have as with the projection of the fixing part of the running shaft of motor; This housing connects multi-disc blade and above-mentioned multi-disc blade and forms the suction air guiding wall; Wherein: the motor side side at mainboard has a plurality of wheel hub runners in accordance with regulations at interval, these a plurality of wheel hubs with runner be located at blade in the resin inlet of all side ends mainboard par nearby link to each other, wall thickness than main board tilt face is thicker, radially stretches out with straight line shape towards fan; The resin fluidic junction that generates between adjacent wheel hub is with runner is not attached to ground, motor cooling hole at least and forms runner, all side hollow parts in the blade of blade hollow part, blade outer circumferential side hollow part, and hollow part surface, blade the place ahead, hollow part surface, blade rear all is the plane of inclination of arbitrarily angled θ with respect to running shaft, all side ends in the blade, blade outer circumferential side end, end, blade suction side, the sense of rotation of blade is in blade the place ahead sidepiece in the place ahead relatively, each wall thickness that is in the blade rear sidepiece at rear forms in the mode that forms the identical wall thickness of cardinal principle on blade integral, blade and blade hollow part become thin head shapes ground and form from mainboard towards case side, so, make at wheel hub with runner by wheel hub, the Resin Flow height at mainboard place, the formability height, in addition, the resin fluidic junction does not form the wheel hub runner with motor cooling hole at least communicatively, so, impact in the time of can preventing to transport etc. causes the breakage of fan, because blade is hollow structure, so, but turbofan integral body lighting, because wall thickness is roughly even, so, be difficult for occurring in the even occasion of the wall unevenness of blade because of the uneven shaping problem that causes of contingent resin hardening by cooling time, formability is good.In addition, because blade and blade hollow part are the thin head shapes with shaping pattern draft towards the housing predetermined oblique angle from mainboard, so the easy demoulding of forming die can prevent that blade is attached to mould and causes the breakage of blade, formability height.

In addition, the weight that the lighting of blade makes the turbofan peripheral part lightens with respect to the rotating center of turbofan, thereby the centrifugal force can reduce to rotate the time reduces the stress that is additional to blade mainboard root, improve intensity, the breakage of the turbofan in the time of can preventing to rotate.According to above result, can obtain the turbofan of lightweight, formability and intensity height, high reliability.

In addition, all side hollow parts in the blade of blade hollow part, blade outer circumferential side hollow part, and hollow part surface, blade the place ahead, hollow part surface, blade rear all is plane of inclination between tilt angle theta=1～3 ° with respect to running shaft, all side ends in the blade, blade outer circumferential side end, end, blade suction side, be in blade the place ahead sidepiece in the place ahead with respect to the blade sense of rotation, each wall thickness that is in the blade rear sidepiece at rear forms in the mode that becomes the identical wall thickness of cardinal principle on blade integral, blade and blade hollow part form from mainboard towards case side in the mode that forms thin head shapes, like this, because blade is hollow structure, so, but lighting, because wall thickness is roughly even, so, be difficult for occurring in the even occasion of the wall unevenness of blade because of the uneven shaping problem that causes of contingent resin hardening by cooling time, formability is good.In addition, because blade and blade hollow part are the thin head shapes with shaping pattern draft towards the housing predetermined oblique angle from mainboard, so the easy demoulding of forming die can prevent that blade is attached on the mould and causes the breakage of blade, formability height.In addition, at least noise change little, do not worsen.According to above result, when being 1 °～3 ° as tilt angle theta at least, can obtaining noise and change the turbofan little, that formability is high.

In addition, because the circumferential installation pitch angle σ of blade 3 presses the irregular pitch configuration, simultaneously, the circumferential pitch angle γ and the blade 3 in motor cooling hole 5 relatively are the irregular pitch angle, and from fan rotating center O towards radially press wheel hub usefulness runner 9a that straight line shape extends also with blade 3, motor cooling hole 5 relatively is an irregular pitch, a resin inlet 10, wheel hub runner 9a, blade runner 9b, the configuration in motor cooling hole 5 is identical substantially, so, molding condition is difficult for changing, can prevent that the cavity that mobile inequality causes from taking place, the thin-walled property of the part of wall thickness can prevent that the intensity of turbofan from worsening.In addition, because motor cooling hole 5 is identical with the configuration relation of blade 3, so, directly do not collide by the turbulent E2 that motor cooling hole 5 flows out to the inner air channel 6 of fan from fan external air channel 7 with blade 3, so, can obtain not to be subjected to big pressure oscillation, can low noiseization turbofan.

In addition, use runner 9a towards cooling hole runner 9d from wheel hub, flow to projection 2c from the resin that resin inlet 10 flows out.At this moment, there is cooling hole runner 9d in 5 peripheries in motor cooling hole, resin flows into the back and positively converges at the resin flows direction rear in motor cooling hole again, flow towards projection 2c, so, do not have the cooling hole runner as prior art around cooling hole, the difficult possibility of converging again that becomes at the resin flows direction rear of cooling hole is low, can improve the intensity around the motor cooling hole 5 of opening reduction intensity easily.As a result, can improve formability and improve intensity by improving motor cooling hole Resin Flow on every side, even obtain to be subjected to impacting also not breakable turbofan.

In addition, if wheel hub with runner 9a and blade with each thickest t1, t2 and the ratio of the minimum wall thickness (MINI W.) t0 of the other parts of mainboard 2 scope that is in t1/t2=1.1～2, t2/t0=1.1～2 of runner 9b, then compare with the occasion of identical wall thickness (t1/t0, t2/t0=) at least and can shorten curring time, can increase output in the identical time, simultaneously, also can reduce the electricity charge that consume by forming machine, save energy.

In addition, the blade that forms peripherally of mainboard outer side opening portion of blade that surrounds hollow structure is with blade the place ahead runner of the suitable portion in blade sense of rotation side of runner, blade rear runner height than the suitable portion of blade sense of rotation opposite sides, form highlightedly towards the fan outside, so, collide in mainboard air-flow nearby bight at blade rear runner after breaking away from blade the place ahead runner in the time of can suppressing to rotate, produce pressure oscillation and produce noise in the herring bone district, make the air-flow that breaks away from behind the runner of blade the place ahead attachment point again at the sense of rotation rear of blade rear runner, move towards blade openings portion rear, successfully adhere to again, so, can realize low noiseization.

In addition, turbofan has discoid mainboard and housing, by thermoplastic resin formed; This discoid mainboard forms the wheel hub of convex in the mode that covers motor at central part, on the wheel hub of this convex, has a plurality of motor coolings hole that is communicated with motor and fan inside, and, the central part of above-mentioned wheel hub have as with the projection of the fixing part of the running shaft of motor; This housing connects multi-disc blade and above-mentioned multi-disc blade and forms the suction air guiding wall; Wherein: the motor side side at mainboard has a plurality of wheel hub runners in accordance with regulations at interval, these a plurality of wheel hubs with runner be located at blade in the resin inlet of all side ends mainboard par nearby link to each other, wall thickness than main board tilt face is thicker, radially stretches out with straight line shape towards fan; The resin fluidic junction that generates between adjacent wheel hub is with runner forms runner in the mode that is not attached to motor cooling hole at least, all side hollow parts in the blade of blade hollow part, blade outer circumferential side hollow part, and hollow part surface, blade the place ahead, hollow part surface, blade rear all is the plane of inclination of arbitrarily angled θ with respect to running shaft, all side ends in the blade, blade outer circumferential side end, end, blade suction side, be in blade the place ahead sidepiece in the place ahead with respect to the sense of rotation of blade, each wall thickness that is in the blade rear sidepiece at rear forms in the mode that forms the identical wall thickness of cardinal principle on blade integral, blade and blade hollow part form from mainboard towards case side in the mode that becomes thin head shapes, be connected with runner with the blade that forms peripherally of the mainboard outer side opening portion of the blade that surrounds above-mentioned hollow structure by connecting runner, above-mentioned blade blade the place ahead runner of the suitable portion in blade sense of rotation side of runner, blade rear runner height than the suitable portion of blade sense of rotation opposite sides, to form towards the outside outstanding mode of fan, so, make wheel hub by wheel hub with runner, the Resin Flow height at mainboard place, the formability height, the resin fluidic junction does not form the wheel hub runner with motor cooling hole at least communicatively, so the impact in the time of can preventing to transport etc. causes the breakage of fan.In addition, because blade is hollow structure, so, but the lighting of turbofan integral body, because wall thickness is roughly even, so, be difficult for the shaping problem of generation because of causing in the contingent resin hardening by cooling time inequality of the even occasion of the wall unevenness of blade, formability is good.In addition, because blade and blade hollow part are the thin head shapes with shaping pattern draft towards housing inclination predetermined angular from mainboard, so the easy demoulding of forming die can prevent that blade is attached to the breakage that mould causes blade, the formability height.Mainboard being flowing in nearby collided in the bight of blade rear runner after breaking away from blade the place ahead runner, produced pressure oscillation and produce the problem of noise in the herring bone district in the time of can suppressing to rotate, make the attachment point again that breaks away from the sense of rotation rear that is flowing in blade rear runner behind the blade passage of blade the place ahead move, successfully adhere to again towards opening portion rear, blade rear, so, can realize low noiseization.In addition, because the blade wall thickness thickening of the place ahead runner, so the easier blade that flows to of resin can prevent shrinkage cavity during shaping, and the intensity of blade the place ahead runner also improves, and the intensity of turbofan also further improves.According to above result, can obtain such turbofan, this turbofan is in light weight, intensity is high, even when rotation and also can prevent the breakage of fan when transporting, noise is low.

In addition, turbofan makes maximum open diameter F and the blade the place ahead runner 9ba of the 3b of blade openings portion of hollow structure, the ratio Δ t/F=4 of height difference Δ t between the runner 9bb of blade rear～22% ground forms, being flowing in when suppressing rotation near the mainboard collided in the bight of blade rear runner after breaking away from blade the place ahead runner, produce pressure oscillation and produce noise in the herring bone district, the attachment point again that breaks away from the sense of rotation rear that is flowing in blade rear runner behind the runner of blade the place ahead is moved towards opening portion rear, blade rear, successfully adhere to again, so, can realize low noiseization.In addition, the wall thickness that can suppress blade the place ahead runner is blocked up, be flowing in blade the place ahead runner peels off and sends the peak sound that is caused by rotating speed, can prevent noise penalty, realize low noiseization.

Air conditioner carries the turbofan 1 of arbitrary structure of mode of execution 1 record, in the suction side of turbofan or blow out side configuration heat exchanger; In this air conditioner, can realize thin-walled property by the formability that improves turbofan 1, so, but lighting, in addition, the strength reliability height, so, impact such as the vibration that turbofan 1 can be when not transporting when being provided with after transporting and destroy the product reliability height.In addition, corresponding with turbofan 1 lightweight that becomes, but also lighting of product weight.

In addition, form ceiling-embedded air conditioner, this ceiling-embedded air conditioner is formed the side plate of air conditioner main body by the sheet metal member, top board, and side plate and at least the air conditioner main body inboard of the part of top board constitute the air channel wall by thermoinsulation material, near the central interior of above-mentioned air conditioner main body, carry the turbofan 1 of any structure of motor and mode of execution 1 record, the central part configuration is as the suction port of said fans and the horn mouth of formation main body suction port below above-mentioned air conditioner main body, with the upright heat exchanger of establishing of the mode that surrounds above-mentioned turbofan periphery, at the drainage tray of the bottom of above-mentioned heat exchanger configuration with foam material formation, around the aforementioned body suction port, roughly the position along air conditioner main body side plate has the main body blow-off outlet, below main body, install and have the plate suction port that is communicated with aforementioned body suction port and aforementioned body blow-off outlet respectively, the decorative sheet of plate blow-off outlet, like this, can realize thin-walled property by the formability that improves turbofan 1, so, can realize lighting, in addition, because strength reliability height, so, when after transporting, being provided with, turbofan 1 can be when not transporting impact such as vibration and destroy the product reliability height.In addition, the weight that alleviates with turbofan 1 is corresponding, and product weight also alleviates.

Claims

1. a turbofan is characterized in that: have the wheel hub of discoid mainboard, convex, a plurality of blade, motor cooling hole, a plurality of wheel hub runner, reach the resin fluidic junction; The wheel hub of this convex forms towards the running shaft direction is outstanding by the central part that makes above-mentioned mainboard; These a plurality of blades are base portion with the outer circumferential side plat part of above-mentioned mainboard, establish towards the projected direction of above-mentioned wheel hub is upright; This motor cooling hole is provided with a plurality of on above-mentioned wheel hub, and the motor that is disposed in the convex space that above-mentioned wheel hub surrounds is cooled off; These a plurality of wheel hubs with runners on above-mentioned wheel hub with radial setting, thermoplastic resin flowed into and form above-mentioned wheel hub; This resin fluidic junction is by forming with the above-mentioned thermoplastic resin contact that runner flows out from adjacent above-mentioned wheel hub when the above-mentioned shaping; Above-mentioned motor cooling hole disposes in the mode of avoiding above-mentioned resin fluidic junction.

2. turbofan according to claim 1, it is characterized in that: above-mentioned blade-shaped becomes the hollow shape that has opening at above-mentioned base portion, have the above-mentioned base portion of being located at above-mentioned each blade around and the blade that forms above-mentioned blade with runner, and connect respectively above-mentioned wheel hub with runner be positioned near the be connected runner of its above-mentioned blade with runner; From be located at above-mentioned wheel hub with runner, above-mentioned connection runner, and above-mentioned blade inject above-mentioned thermoplastic resin with the inlet of any runner of runner, make it flow to all above-mentioned runners and be shaped.

3. turbofan is characterized in that: a plurality of blades, wheel hub with wheel hub, hollow shape of discoid mainboard, convex with runner, blade with runner, and connect runner; The wheel hub of this convex forms towards the running shaft direction is outstanding by the central part that makes above-mentioned mainboard; These a plurality of blades are base portion with the outer circumferential side plat part of above-mentioned mainboard, establish towards the projected direction of above-mentioned wheel hub is upright, and have opening at above-mentioned base portion; This wheel hub is provided with a plurality ofly with radial with runner on above-mentioned wheel hub, thermoplastic resin is flowed into and forms above-mentioned wheel hub; This blade be located at runner above-mentioned each blade above-mentioned base portion around, when above-mentioned shaping, flow into above-mentioned thermoplastic resin and form above-mentioned blade; This connection runner connects above-mentioned wheel hub respectively with runner and near the above-mentioned blade runner that is positioned at it.

4. according to claim 1,2 or 3 described turbofan, it is characterized in that: a plurality of motor coolings hole of being located at above-mentioned wheel hub is configured to towards the rotating center side and prolongs above-mentioned wheel hub with on the part of runner.

5. turbofan according to claim 4 is characterized in that: above-mentioned motor cooling hole and above-mentioned wheel hub runner that equal number is set.

6. according to any one described turbofan in the claim 1～5, it is characterized in that: above-mentioned wheel hub with runner from the above-mentioned mainboard of above-mentioned wheel hub to face above-mentioned motor configurations side-prominent.

7. according to any one described turbofan in claim 2 and 4～6, it is characterized in that: be that the center is provided with by radial how group is cooled off groups that hole constitute with runner, above-mentioned wheel hub with runner, above-mentioned connection runner, above-mentioned motor by above-mentioned blade, above-mentioned blade with the running shaft.

8. turbofan according to claim 7 is characterized in that: with other angle differently constitute with above-mentioned group of adjacent angulation at least 1 angle.

According to claim 1,2, and 4～8 in any one described turbofan, it is characterized in that: have the cooling hole runner, this cooling hole is connected in above-mentioned wheel hub runner with runner, forms to surround the mode on every side that above-mentioned motor cools off the hole.

10. according to any one described turbofan in the claim 2～9, it is characterized in that: is the minimum wall thickness (MINI W.) of the part except that above-mentioned runner of t, above-mentioned mainboard when being t0 with the wall thickness of runner and above-mentioned blade with the wall thickness of at least one side in the wall thickness of runner when establishing above-mentioned wheel hub, and the ratio t/t0 of establishing is in the scope of 1.1≤t1/t0≤2.

11. a turbofan is characterized in that: a plurality of blades, and blade runner with wheel hub, hollow shape of discoid mainboard, convex; The wheel hub of this convex forms towards the running shaft direction is outstanding by the central part that makes above-mentioned mainboard; These a plurality of blades are base portion with the outer circumferential side plat part of above-mentioned mainboard, establish towards the projected direction of above-mentioned wheel hub is upright, and have opening at above-mentioned base portion; This blade is provided with in the mode of giving prominence to towards the direction opposite with the upright set direction of above-mentioned blade from above-mentioned mainboard around above-mentioned opening with runner; Be positioned at the projecting height of sense of rotation the place ahead above-mentioned blade on every side of above-mentioned opening with runner, bigger than the above-mentioned blade around the sense of rotation rear that is positioned at above-mentioned opening with the projecting height of runner.

12. turbofan according to claim 11, it is characterized in that: the inscribe diameter of a circle on the face of the above-mentioned mainboard of establishing above-mentioned opening is maximum open width F, when being positioned at above-mentioned blade around sense of rotation the place ahead of above-mentioned opening and being Δ t with the projecting height of runner and the sense of rotation rear that is positioned at above-mentioned opening above-mentioned blade on every side with the difference of the projecting height of runner, Δ t/F is in the scope of 0.04≤Δ t/F≤0.22.

13. a turbofan is characterized in that: wheel hub, and a plurality of blades of hollow shape with discoid mainboard, convex; The wheel hub of this convex forms towards the running shaft direction is outstanding by the central part that makes above-mentioned mainboard; These a plurality of blades are base portion with the outer circumferential side plat part of above-mentioned mainboard, establish towards the projected direction of above-mentioned wheel hub is upright, and have opening at above-mentioned base portion; Make the outside of blade of above-mentioned hollow shape and hollow inboard upright establish to face hollowly inboardly tilt, make the outside of above-mentioned blade and above-mentioned hollow inboard become the shape that attenuates from above-mentioned base portion towards front end.

14. turbofan according to claim 13 is characterized in that: the wall thickness of above-mentioned blade substantially evenly.

15. according to claim 13 or 14 described turbofan, it is characterized in that: the upright face of establishing that makes the outside of blade of above-mentioned hollow shape and hollow inboard inboardly tilts towards hollow by predetermined tilt angle theta with respect to running shaft, makes above-mentioned predetermined tilt angle theta be in the scope of 1 °≤θ≤3 ° respectively.

16. an air conditioner is characterized in that: have any one described turbofan and heat exchanger in the claim 1～15; In above-mentioned heat exchanger, make by above-mentioned turbofan and carry out heat exchange, blow out from blow-off outlet then from suction port inhaled air and refrigeration agent.