CN105473853A - Propeller fan and blower - Google Patents

Abstract

Defining gamma as the inner angle formed when connecting an inside reference point (Q1), a blade tip (71) and an outside reference point (Q2) in that order with straight lines, it holds for this propeller fan that 12<=gamma/n<=17; defining Ln as the length along an arc which is a section of a circumscribed circle (CR) and is formed between a first point (P1) and an intermediary portion (P4), it holds that 0.4<=Ln/Lm<=0.7; and, defining R1 as the length of the line segment connecting the center of the circumscribed circle (CR) and the blade tip (71) and R0 as the radius of the circumscribed circle (CR), it holds that 0.8<=R1/R0<=0.95.

Description

Propeller type fan and blast device

Technical field

The present invention relates to propeller type fan and blast device.

Background technique

Known blast and wind speed by making the wind of blowout changes and blows out and there is the blast device (patent documentation 1) of the wind of strong and weak ripple by certain cycle as fluctuated.Patent documentation 1 describes as applying the stimulation of fine motion to scalp and contribute to maintaining the health of scalp and hair.In addition, also known can by blowout air-supply carry out scalp massage and by change nozzle also as blower use blast device (patent documentation 2).

On the other hand, known following propeller type fan (patent documentation 3), it is in order to also not easily be destroyed when blowing wind at a high speed from outside, and from trailing edge to the scope of the regulation in leading edge direction in the region close to wheel hub commissura, be formed with the region that flabellum thickness is thick compared with the flabellum thickness of central part.In addition, also known following axial fan (patent documentation 4), it is in order to improve the rigidity of axial fan and the intensity relative to centrifugal force, is provided with the increased wall thickness extended along flabellum leading edge to flabellum periphery from the joining portion of flabellum front edge and hub portion.In addition, also known following axial fan impeller (patent documentation 5), the rigidity of the root of blade of impeller when it is not in order to reduce rotation, is formed with in the leading edge portion of the root of blade the heavy section that wall thickness increases compared with other root.

prior art document

patent documentation

Patent documentation 1: JP 2012-019865 publication

Patent documentation 2: JP 2010-131259 publication

Patent documentation 3: patent No. 5079063 publication

Patent documentation 4: patent No. 4922698 publication

Patent documentation 5: patent No. 3365374 publication

Summary of the invention

the problem that invention will solve

Propeller type fan requires the air-supply realizing having high directly blowing property and high wind pressure sometimes.Such as in nearest blower, not only require the function drying up hair, also require the function of nursing scalp.When being equipped on the propeller type fan of above-mentioned blower, can by having the air-supply of high directly blowing property and high wind pressure, blow hair open and wind be transported to scalp, the drying can not only carrying out hair can also nurse scalp.

The object of the invention is to, provide and can realize the propeller type fan with the high directly air-supply of blowing property and high wind pressure and the blast device possessing above-mentioned propeller type fan.

for the scheme of dealing with problems

Based on the propeller type fan of the 1st aspect of the present invention, be subject to rotating power and rotate around imaginary running shaft, above-mentioned propeller type fan possesses: hub portion, and n (n is the integer of more than 2) individual flabellum, it extends from above-mentioned hub portion to the outside in turning radius direction, and above-mentioned flabellum comprises: flabellum front end, and it is positioned at sense of rotation foremost, front edge, it extends to above-mentioned hub portion from above-mentioned flabellum front end, forms the leading edge of the above-mentioned flabellum of sense of rotation, hinder marginal part, it is arranged than the rear side of above-mentioned front edge by sense of rotation, extends from above-mentioned hub portion towards the outside in turning radius direction, forms the trailing edge of the above-mentioned flabellum of sense of rotation, periphery rearward end, it is positioned at the end in the outside in the turning radius direction of above-mentioned hinder marginal part, and edge, periphery, it connects above-mentioned flabellum front end and above-mentioned periphery rearward end, form the outer periphery of the above-mentioned flabellum in turning radius direction, when overlooking above-mentioned flabellum from the direction parallel with above-mentioned running shaft, the position being depicted in above-mentioned running shaft has center and the circumcircle circumscribed with above-mentioned flabellum, the straight line connecting above-mentioned center and above-mentioned flabellum front end is set to the 1st straight line, above-mentioned 1st straight line and above-mentioned circumscribed intersection point are set to the 1st point, the straight line connecting above-mentioned center and above-mentioned periphery rearward end is set to the 2nd straight line, above-mentioned 2nd straight line and above-mentioned circumscribed intersection point are set to the 2nd point, the length circumferentially of the circular arc be formed between above-mentioned 1st and above-mentioned 2nd in above-mentioned circumcircle is set to Lm, to be positioned on above-mentioned circumcircle and be set to the 3rd point from above-mentioned 1st point leaving the amount of the length of the circumference along (0.1 × Lm), the straight line connecting above-mentioned center and at above-mentioned 3rd is set to the 3rd straight line, the intersection point of above-mentioned 3rd straight line and above-mentioned front edge is set to inner side reference point, the intersection point of above-mentioned 3rd straight line and edge, above-mentioned periphery is set to outside reference point, by above-mentioned inner side reference point, when the interior angle formed when above-mentioned flabellum front end and above-mentioned outside reference point connect with straight line according to this order is set to γ, the relation of 12≤γ/n≤17 is set up, edge, above-mentioned periphery comprises the midway part be positioned on above-mentioned circumcircle, part between above-mentioned flabellum front end in edge, above-mentioned periphery and above-mentioned middle part divide have with along with dividing from above-mentioned flabellum front end toward above-mentioned middle part away from the shape of the mode at above-mentioned center to the outer expandable in turning radius direction, when the length circumferentially of the circular arc be formed in above-mentioned 1st o'clock between above-mentioned middle part minute in above-mentioned circumcircle is set to Ln, the relation of 0.4≤Ln/Lm≤0.7 is set up, the length of the line segment connecting above-mentioned center and above-mentioned flabellum front end is being set to R1, when above-mentioned circumscribed radius is set to R0, the relation of 0.8≤R1/R0≤0.95 is set up.

Preferably be depicted in the flow direction by rotating the wind generated is positioned at than above-mentioned propeller type fan downstream and with the datum plane of above-mentioned rotating shaft direct cross, when the distance of the distance said reference plane by the direction parallel with above-mentioned running shaft is called height, to form in the position of above-mentioned hub portion and above-mentioned flabellum, the height that flow direction by rotating the wind generated is positioned at the part of side, most upstream is set to h0, the height of above-mentioned flabellum front end is set to h1, the height of the part of above-mentioned hub portion being intersected with above-mentioned front edge is set to h2, the height of the part of above-mentioned hub portion being intersected with above-mentioned hinder marginal part is set to h3, will at h0, h1, h2, the area of the sectional shape of the above-mentioned hub portion formed when each height of h3 hypothetically cuts off above-mentioned hub portion by the plane with above-mentioned rotating shaft direct cross is set to S0 respectively, S1, S2, S3, be set to δ 1=(-S0+S1)/(h0-h1), be set to δ 2=(-S1+S2)/(h1-h2), be set to δ 3=(-S2+S3)/(h2-h3), the relation of δ 1 × 0.9≤δ 2≤δ 1 × 1.1 is set to formula 1, when the relation of δ 2 × 0.9≤δ 3≤δ 2 × 1.1 is set to formula 2, in formula 1 and formula 2 at least any one is set up.

Preferably the part that above-mentioned hub portion and above-mentioned hinder marginal part intersect is set to back root part, the straight line connecting above-mentioned flabellum front end and above-mentioned back root part is set to angled straight lines, when above-mentioned angled straight lines and the plane angulation parallel with above-mentioned running shaft are set to θ A, the relation of 25≤θ A≤45 is set up.

Based on the propeller type fan of the 2nd aspect of the present invention, rotate around imaginary running shaft by being subject to rotating power, above-mentioned propeller type fan possesses: hub portion; And multiple flabellum, it extends from above-mentioned hub portion to the outside in turning radius direction, and above-mentioned flabellum comprises: flabellum front end, and it is positioned at sense of rotation foremost; Front edge, it extends to above-mentioned hub portion from above-mentioned flabellum front end, forms the leading edge of the above-mentioned flabellum of sense of rotation; Hinder marginal part, it is arranged than the rear side of above-mentioned front edge by sense of rotation, extends from above-mentioned hub portion towards the outside in turning radius direction, forms the trailing edge of the above-mentioned flabellum of sense of rotation; Periphery rearward end, it is positioned at the end in the outside in the turning radius direction of above-mentioned hinder marginal part; and edge, periphery, it connects above-mentioned flabellum front end and above-mentioned periphery rearward end, form the outer periphery of the above-mentioned flabellum in turning radius direction, when the thickness of the above-mentioned flabellum by the direction parallel with above-mentioned running shaft is called flabellum thickness, the part of the front side of the sense of rotation in above-mentioned flabellum has heavy section, above-mentioned heavy section extends by banded in part or all the mode along above-mentioned front edge, and the part being formed as flabellum face bloats, above-mentioned heavy section has in the shape forming maximum fan leaf thickness from above-mentioned front edge in the scope of less than 20% of the flabellum chord length of above-mentioned flabellum, the line described when the part being formed with maximum fan leaf thickness in above-mentioned heavy section being connected with 1 line is set to maximum fan leaf thickness line, when distance between the above-mentioned maximum fan leaf thickness line in the direction along flabellum chord length at above-mentioned flabellum and above-mentioned front edge is set to D, above-mentioned maximum fan leaf thickness line has distance D and becomes large part along with from the inner side in turning radius direction gradually toward outside.

Preferably when overlooking above-mentioned flabellum from the direction parallel with above-mentioned running shaft, the length of the line segment connecting above-mentioned running shaft and above-mentioned flabellum front end is being set to R1, the part that above-mentioned hub portion and above-mentioned front edge intersect is set to front root, the length of the line segment connecting above-mentioned running shaft and above-mentioned front root is set to R2, when the length being positioned at the line segment of the outermost part in turning radius direction connected in above-mentioned running shaft and above-mentioned heavy section is set to R3, the relation of 0.4 < (R3-R2)/(R1-R2) is set up.

Preferably the flabellum thickness being formed with the part of maximum fan leaf thickness in above-mentioned heavy section is being set to Tmax, the length of the flabellum chord length of above-mentioned flabellum is set to C, when the flabellum thickness of the position of above-mentioned for the distance in above-mentioned flabellum front edge 0.3 × C is set to Tn, the relation of (Tmax/Tn) < 1.35 is set up.

Preferred above-mentioned heavy section has flabellum thickness along with the thinning shape toward the outside in turning radius direction.

Based on blast device of the present invention, possess: wind path forming member, it has suction port and ejiction opening; Drive motor; And above-mentioned propeller type fan, it is driven by above-mentioned drive motor, is configured in above-mentioned wind path forming member.

invention effect

According to the present invention, can provide and can realize the propeller type fan with the high directly air-supply of blowing property and high wind pressure and the blast device possessing above-mentioned propeller type fan.

Accompanying drawing explanation

Fig. 1 is the sectional view of the blast device representing mode of execution 1.

Fig. 2 is the sectional view represented after being amplified in the region surrounded by II line in Fig. 1.

Fig. 3 is the side view representing the propeller type fan that the blast device of mode of execution 1 possesses.

Fig. 4 is the plan view representing the propeller type fan that the blast device of mode of execution 1 possesses.

Fig. 5 is the plan view of the flabellum representing the propeller type fan that the blast device of mode of execution 1 possesses in detail.

Fig. 6 is the plan view representing the propeller type fan appearance just when rotated that the blast device of mode of execution 1 possesses.

Fig. 7 is the side view representing the propeller type fan appearance just when rotated that the blast device of mode of execution 1 possesses.

Fig. 8 is the plan view of the propeller type fan appearance just when rotated that the blast device of the comparative example representing mode of execution 1 possesses.

Fig. 9 is the side view of the propeller type fan appearance just when rotated that the blast device of the comparative example representing mode of execution 1 possesses.

Figure 10 is the plan view of the flabellum of the propeller type fan that the blast device of the comparative example representing mode of execution 1 in detail possesses.

Figure 11 is that blast device for contrasting mode of execution 1 and comparative example thereof is just at the figure of the appearance of action.

Figure 12 is the side view of the propeller type fan of the relation represented for illustration of 12≤γ/n≤17.

Figure 13 is the plan view of the propeller type fan of the relation represented for illustration of 12≤γ/n≤17.

Figure 14 is the plan view of the model representing the experiment that the relation about 12≤γ/n≤17 is carried out.

Figure 15 is the figure of the result (just from the air quantity after blow-off outlet blowout) representing the experiment that the relation about 12≤γ/n≤17 is carried out.

Figure 16 is the figure of the result (keeping the area of the part of the speed of 0.9 times of wind speed V0) representing the experiment that the relation about 12≤γ/n≤17 is carried out.

Figure 17 is the figure of the result (relation of air quantity and noise) representing the experiment that the relation about 12≤γ/n≤17 is carried out.

Figure 18 represents the plan view for the propeller type fan be described the relation of 0.4≤Ln/Lm≤0.7.

Figure 19 represents the plan view for another propeller type fan be described the relation of 0.4≤Ln/Lm≤0.7.

Figure 20 is the plan view of the model representing the experiment that the relation about 0.4≤Ln/Lm≤0.7 is carried out.

Figure 21 is the figure of the result (just from the air quantity after blow-off outlet blowout) representing the experiment that the relation about 0.4≤Ln/Lm≤0.7 is carried out.

Figure 22 is the figure of the result (keeping the area of the part of the speed of 0.9 times of wind speed V0) representing the experiment that the relation about 0.4≤Ln/Lm≤0.7 is carried out.

Figure 23 is the plan view of the model representing the experiment that the relation about 0.8≤R1/R0≤0.95 is carried out.

Figure 24 is the figure of the result (just from the air quantity after blow-off outlet blowout) representing the experiment that the relation about 0.8≤R1/R0≤0.95 is carried out.

Figure 25 is the figure of the result (keeping the area of the part of the speed of 0.9 times of wind speed V0) representing the experiment that the relation about 0.8≤R1/R0≤0.95 is carried out.

Figure 26 is the plan view of the flabellum representing the propeller type fan that another blast device formed of mode of execution 1 possesses in detail.

Figure 27 is the side view representing the propeller type fan that the blast device of mode of execution 2 possesses.

The propeller type fan that the blast device that Figure 28 relates to mode of execution 2 possesses is the figure schematically showing the flabellum be configured in inner casing.

The propeller type fan that the blast device that Figure 29 relates to the comparative example of mode of execution 2 possesses is the figure schematically showing the flabellum be configured in inner casing.

Figure 30 is the figure of the condition representing the experiment relevant with mode of execution 2.

Figure 31 is another figure of the condition representing the experiment relevant with mode of execution 2.

Figure 32 is the stereogram of the propeller type fan representing the embodiment 1 used in the experiment relevant with mode of execution 2.

Figure 33 is the stereogram of the propeller type fan representing the embodiment 2 used in the experiment relevant with mode of execution 2.

Figure 34 is the stereogram of the propeller type fan representing the comparative example 1 used in the experiment relevant with mode of execution 2.

Figure 35 is the stereogram of the propeller type fan representing the comparative example 1 used in the experiment relevant with mode of execution 2.

Figure 36 is the figure of the result (relation of angle of inclination and air quantity) representing the experiment carried out about mode of execution 2.

Figure 37 is the figure of the result (relation of angle of inclination and noise) representing the experiment carried out about mode of execution 2.

Figure 38 is the figure of the result (relation of angle of inclination and power consumption) representing the experiment carried out about mode of execution 2.

Figure 39 is the stereogram representing the propeller type fan that the blast device of mode of execution 3 possesses.

Figure 40 is the plan view representing the propeller type fan that the blast device of mode of execution 3 possesses.

Figure 41 is the plan view of the flabellum representing the propeller type fan that the blast device of mode of execution 3 possesses in detail.

Figure 42 is the sectional view along the XLII line in Figure 40.

Figure 43 is the sectional view along the XLIII line in Figure 40.

Figure 44 is the sectional view along the XLIV line in Figure 40.

Figure 45 is the sectional view along the XLV line in Figure 40.

Figure 46 is the sectional view along the XLVI line in Figure 40.

Figure 47 is another plan view representing the propeller type fan that the blast device of mode of execution 3 possesses.

Figure 48 is the figure of the flabellum thickness of the part represented along the flabellum chord length LS1 ~ LS4 shown in Figure 47.

Figure 49 is the plan view representing the propeller type fan appearance just when rotated that the blast device of mode of execution 3 possesses.

Figure 50 is the side view representing the propeller type fan appearance just when rotated that the blast device of mode of execution 3 possesses.

Figure 51 is the sectional view representing the propeller type fan appearance just when rotated that the blast device of mode of execution 3 possesses.

Figure 52 is the stereogram of the propeller type fan that the blast device of the comparative example representing mode of execution 3 possesses.

Figure 53 is the plan view of the propeller type fan that the blast device of the comparative example representing mode of execution 3 possesses.

Figure 54 is the sectional view along the LIV line in Figure 53.

Figure 55 is the sectional view along the LV line in Figure 53.

Figure 56 is the sectional view along the LVI line in Figure 53.

Figure 57 is the sectional view along the LVII line in Figure 53.

Figure 58 is the sectional view along the LVIII line in Figure 53.

Figure 59 is another plan view of the propeller type fan that the blast device of the comparative example representing mode of execution 3 possesses.

Figure 60 is the figure of the flabellum thickness of the part represented along the flabellum chord length LT1 ~ LT4 shown in Figure 59.

Figure 61 is the plan view of the propeller type fan appearance just when rotated that the blast device of the comparative example representing mode of execution 3 possesses.

Figure 62 is the side view of the propeller type fan appearance just when rotated that the blast device of the comparative example representing mode of execution 3 possesses.

Figure 63 is the sectional view of the propeller type fan appearance just when rotated that the blast device of the comparative example representing mode of execution 3 possesses.

Figure 64 is the plan view representing the propeller type fan that the blast device of mode of execution 4 possesses.

Figure 65 is the plan view of the flabellum representing the propeller type fan that the blast device of mode of execution 4 possesses in detail.

Figure 66 is the plan view representing the propeller type fan that the blast device of mode of execution 5 possesses.

Figure 67 is the plan view of the flabellum representing the propeller type fan that the blast device of mode of execution 5 possesses in detail.

Figure 68 is the plan view representing the propeller type fan that the blast device of mode of execution 6 possesses.

Figure 69 is the plan view of the flabellum representing the propeller type fan that the blast device of mode of execution 6 possesses in detail.

Figure 70 is the plan view of the propeller type fan possessed for illustration of the blast device of mode of execution 7.

Figure 71 is the plan view of the model representing the 1st experiment carried out about mode of execution 3.

Figure 72 is the sectional view of an example of the model of the flabellum representing the 1st experiment carried out about mode of execution 3.

Figure 73 is the sectional view of another example of the model of the flabellum representing the 1st experiment carried out about mode of execution 3.

Figure 74 is the sectional view of another example of the model of the flabellum representing the 1st experiment carried out about mode of execution 3.

Figure 75 is the figure of the result (air-supply efficiency) representing the 1st experiment carried out about mode of execution 3.

Figure 76 is the figure of the result (keeping the area of the part of the speed of 0.9 times of wind speed V0) representing the 1st experiment carried out about mode of execution 3.

Figure 77 is the plan view of the model representing the 2nd experiment carried out about mode of execution 3.

Figure 78 is the figure of the result representing the 2nd experiment carried out about mode of execution 3.

Figure 79 is the figure of the result (air-supply efficiency) representing the 3rd experiment carried out about mode of execution 3.

Figure 80 is the figure of the result (keeping the area of the part of the speed of 0.9 times of wind speed V0) representing the 3rd experiment carried out about mode of execution 3.

Embodiment

Below, reference accompanying drawing is while illustrate based on the embodiments of the present invention and each experimental example.When relating to number and quantity etc. in the explanation of each mode of execution and each experimental example, except there being special situation about recording, scope of the present invention may not be limited to this number and this quantity etc.In the explanation of each mode of execution and each experimental example, sometimes enclose same reference character for same parts and suitable parts and repeatedly do not carry out illustrating of repetition.As long as no special restriction, the formation shown in the formation shown in each mode of execution and each experimental example is suitably combined rear use by initial just making a reservation for.

[mode of execution 1]

(overall formation)

Fig. 1 is the sectional view of the blast device 100 representing mode of execution 1.Blast device 100 is such as blower, possesses main part 10 and handle 20.Handle 20 is provided with operation unit 23.Main part 10 comprises shell 11, inner casing 12, drive motor 30, propeller type fan 50, rectification flabellum 40 and heater 17.Shell 11 and inner casing 12 have the shape of roughly tubular respectively.Shell 11 has inlet opens 13 and exit opening 14.Inlet opens 13 is communicated with exit opening 14, between inlet opens 13 and exit opening 14, form wind path.

Inner casing 12 as wind path forming member has suction port 15 and ejiction opening 16.Suction port 15 is positioned at inlet opens 13 side, and ejiction opening 16 is positioned at exit opening 14 side.Drive motor 30, propeller type fan 50 and rectification flabellum 40 are located at the inside of inner casing 12.Motor support portion 44 (with reference to Fig. 2) is provided with in the inner side of rectification flabellum 40.The output shaft 31 (with reference to Fig. 2) of drive motor 30 is configured to the long side direction of main part 10 almost parallel.

Propeller type fan 50 is installed on drive motor 30.Propeller type fan 50 configures by suction port 15 side than drive motor 30.The running shaft (running shaft 80 with reference to Fig. 2) that propeller type fan 50 is configured to propeller type fan 50 is almost parallel with the long side direction of main part 10.Propeller type fan 50 is subject to the rotating power from drive motor 30 and rotates around running shaft, produces the air-flow (air stream) flowed towards the ejiction opening 16 in downstream side and exit opening 14 from the inlet opens 13 of upstream side and suction port 15.Heater 17 configures by exit opening 14 side than propeller type fan 50.

Fig. 2 is the sectional view represented after being amplified in the region surrounded by II line in Fig. 1.For the ease of diagram, the sectional view of Fig. 2 is illustrated as the upside that suction port 15 is positioned at paper, and ejiction opening 16 is positioned at the downside of paper.As mentioned above, drive motor 30, propeller type fan 50 and rectification flabellum 40 are located at the inside of inner casing 12.Motor support portion 44 is provided with in the inner side of rectification flabellum 40.

Rectification flabellum 40 configures than propeller type fan 50 downstream.Rectification flabellum 40 comprises plate-like portion 42.Plate-like portion 42 from the outer surface in motor support portion 44 towards foreign side with radial extension.Plate-like portion 42 vacates interval configuration in the circumferential, makes the flow not reducing the air-flow flowed from suction port 15 towards ejiction opening 16.Plate-like portion 42 has upstream edge edge 43 at upstream side.Upstream edge edge 43 has plane shape, and the direction vertical along the running shaft 80 with propeller type fan 50 extends.

(propeller type fan 50)

Fig. 3 and Fig. 4 is the side view and the plan view that represent propeller type fan 50 respectively.Propeller type fan 50 is made as plastic article integratedly by synthetic resin such as such as AS (acrylonitrile-styrene: acrylonitrile vinyl benzene) resins.Propeller type fan 50 is subject to the rotating power from drive motor 30 (with reference to Fig. 1, Fig. 2) and rotates around the direction of imaginary running shaft 80 to arrow A R1.

As shown in Figure 3 and Figure 4, propeller type fan 50 possesses hub portion 60 and 3 flabellums 70.Propeller type fan 50 has rotational symmetric shape.Rotational Symmetry means when making propeller type fan 50 rotate around running shaft 80, repeats the character of identical figure with the angle of swing of the radian of 2 π/n (n is positive integer, in the present embodiment n=3).Propeller type fan 50 has the character that this flabellum 70 is overlapping with another adjacent flabellum 70 when making in flabellum 70 one to rotate by the angle of swing of 360/3=120 (°) around running shaft 80.

Propeller type fan 50 such as both can make by carrying out distortion processing to one piece of sheet metal, and the thin wall shape thing of the one that also can be formed by having curved surface makes.In these cases, this propeller type fan also can be set to the structure that 3 flabellums 70 are engaged with the hub portion 60 be shaped separately.Propeller type fan 50 both can possess the multiple flabellums 70 beyond 3, also only can possess 1 flabellum 70.When propeller type fan 50 only possesses 1 flabellum 70, the plummet as balace weight can be provided with in the side contrary with flabellum 70 relative to running shaft 80.

(hub portion 60)

Hub portion 60 is subject to the rotating power from drive motor 30 thus the direction to arrow A R1 centered by imaginary running shaft 80 rotates.Hub portion 60 comprises outer surface 61, internal surface 68 (Fig. 2) and bearing portion 69 (Fig. 2).Hub portion 60 has rotational symmetric shape as a whole.The outer surface 61 of hub portion 60 comprises upstream end thereof 62, upstream face 64, the downstream 65 of upstream face 64, downstream face 66 and downstream portion 67.Upstream end thereof 62 is formed in the position of the side, most upstream (summit) of outer surface 61.When propeller type fan 50 just when rotated, to form running shaft 80 through the mode of upstream end thereof 62.Upstream face 64 has the shape with upstream end thereof 62 continuous print roughly conical surface, to extend towards the mode that the outside in the turning radius direction of propeller type fan 50 is expanding along with toward downstream side.

Roughly the shape of conical surface refers to the shape in the face that the sectional shape in the direction along running shaft 80 of upstream face 64 is made up of roughly straight line.The situation that the part of close downstream 65 that roughly conical surface also comprises in the part of the close upstream end thereof 62 in upstream face 64 and/or upstream face 64 suitably bends.The shape of upstream face 64 is if to extend towards the mode that the outside in the turning radius direction of propeller type fan 50 is expanding along with toward downstream side, then also can be formed in bending mode as its entirety, in " roughly conical surface ", both comprise the shape making conical surface bending to the direction close to axis, also comprise the shape making conical surface bending to the direction away from axis.

The upstream end thereof 62 of hub portion 60 has interior angle θ 1 (with reference to Fig. 2).Preferred interior angle θ 1 is more than 50 °, is 98 ° in the present embodiment.Interior angle θ 1 is 50 °, though thus propeller type fan 50 just when rotated hair flow from upstream side towards downstream side, hair also can be suppressed to be involved in the output shaft 31 (with reference to Fig. 2) of drive motor 30.

The downstream 65 of upstream face 64 is formed at the position of the most downstream side of upstream face 64.When overlooking downstream 65 of upstream face 64 (with reference to Fig. 4), the downstream 65 of upstream face 64 has circular shape.Downstream portion 67 (with reference to Fig. 3) is positioned at downstream 65 side farther downstream than upstream face 64.Downstream portion 67 is positioned at the most downstream side as whole outer surface 61.

Downstream face 66 is formed in the mode of the downstream 65 and downstream portion 67 that connect upstream face 64.Downstream face 66 has the shape of cylndrical surface as a whole, extends along the direction parallel with running shaft 80.The downstream 65 of upstream face 64 refers to the part that such as radius of curvature is minimum between upstream face 64 and downstream face 66.The internal surface 68 (Fig. 2) of hub portion 60 is formed at the inner side of outer surface 61.Bearing portion 69 (Fig. 2) has the shape of tubular, is located at the position of the central authorities of internal surface 68.Bearing portion 69 is the positions be connected with the output shaft 31 of drive motor 30 (Fig. 2) by propeller type fan 50.

At this, preferably be set to H (with reference to Fig. 3) at the height dimension in the direction parallel with running shaft 80 by upstream face 64, when the height dimension in the direction parallel with running shaft 80 of downstream face 66 being set to h (with reference to Fig. 3), the value of h/ (H+h) is more than 1/5, is about 1/4 in the present embodiment.The value of h/ (H+h) is the ratio of the height dimension h in the direction upstream and downstream face 66 parallel with running shaft 80 shared by the whole height (H+h) of hub portion 60.In other words, the ratio that the height dimension h of downstream face 66 is shared in the whole height (H+h) of hub portion 60 can be more than 1/5.The value of h/ (H+h) is more than 1/5, though thus propeller type fan 50 just when rotated hair flow from upstream side towards downstream side, hair also can be suppressed to be involved in the output shaft 31 (with reference to Fig. 2) of drive motor 30.

When the value of interior angle θ 1 is less than 50 °, also can by guaranteeing that the height dimension h of downstream face 66 suppresses being involved in of hair to a certain extent.Even if when the height dimension h of downstream face 66 less than whole height 1/5, if interior angle θ 1 has value to a certain degree and flowing has the shape peeled off from outer surface 61, then also can suppress being involved in of hair.Thus, the feature of the characteristic sum h/ (H+h) of interior angle θ 1 can be applied independently relative to hub portion 60.In addition, when hope further suppresses hair to being involved in of the output shaft of drive motor, the mode more preferably set up with the relation of " h/ (H+h)=0.0501 × interior angle θ 1max+0.0056 " sets the maximum value of interior angle θ 1.

(flabellum 70)

3 flabellums 70 are located at the outer surface 61 of hub portion 60, the shape that the outside with the turning radius direction from this outer surface 61 towards propeller type fan 50 extends.3 flabellums 70 have same shape.3 flabellums 70 are arranged with equal intervals in the sense of rotation (direction of arrow A R1) of propeller type fan 50.When 3 flabellums 70 rotate to the direction of arrow A R1 centered by running shaft 80,3 flabellums 70 rotate integratedly with hub portion 60.3 flabellums 70 rotate centered by running shaft 80, produce the air-flow flowed towards ejiction opening 16 (with reference to Fig. 1, Fig. 2) from suction port 15 (with reference to Fig. 1, Fig. 2) thus.

With reference to Fig. 3 and Fig. 4, flabellum 70 has flabellum front end 71, front edge 72, root 73, hinder marginal part 74, periphery rearward end 75 and edge, periphery 76.Flabellum front end 71 is positioned at (front side) foremost of the sense of rotation (direction of arrow A R1) of propeller type fan 50.Front edge 72 extends to the outer surface 61 of hub portion 60 from flabellum front end 71, forms the leading edge of the flabellum 70 of sense of rotation.Front edge 72 extends (with reference to Fig. 4) along with the front side from the outer surface 61 of hub portion 60 toward the outside in turning radius direction towards sense of rotation.Between the outer surface 61 that root 73 is formed in flabellum 70 and hub portion 60 (separatrix).Root 73F (Fig. 3) before the part of intersecting at hub portion 60 and front edge 72 is formed, the part of intersecting at hub portion 60 and hinder marginal part 74 forms back root part 73R (Fig. 3).

Hinder marginal part 74 is arranged than the rear side of front edge 72 by sense of rotation (direction of arrow A R1), extend from the outer surface 61 of hub portion 60 towards the outside in turning radius direction, form the trailing edge of the flabellum 70 in the sense of rotation (direction of arrow A R1) of propeller type fan 50.Hinder marginal part 74 extends (with reference to Fig. 4) along with the slightly front side from the outer surface 61 of hub portion 60 toward the outside in turning radius direction towards sense of rotation.Periphery rearward end 75 is formed at the outermost end (outboard end) of the hinder marginal part 74 on turning radius direction.Edge, periphery 76 connects flabellum front end 71 and periphery rearward end 75, forms the outer periphery of the flabellum 70 on turning radius direction.

The shape come to a point with sickle shaped that it is front end that flabellum 70 has with flabellum front end 71.Flabellum 70 has along with toward the inner side in turning radius direction, the shape that the width in the direction along sense of rotation between front edge 72 and hinder marginal part 74 sharply diminishes.In other words, flabellum 70 has along with the outside toward turning radius direction, and the width in the direction along sense of rotation between front edge 72 and hinder marginal part 74 sharply becomes large shape.

Front edge 72 is positioned at the front side of the sense of rotation (direction of arrow A R1) of flabellum 70, forms the leading edge of the flabellum 70 of sense of rotation.When watching propeller type fan 50 from the direction parallel with running shaft 80 (in other words, when overlooking propeller type fan 50), root 73F is starting point before front edge 72, along with the front side from the outer surface 61 of hub portion 60 toward the outside in turning radius direction towards sense of rotation extends.When watching propeller type fan 50 from the direction orthogonal with running shaft 80 (in other words, when watching propeller type fan 50 from the side), root 73F is starting point before front edge 72, along with the upstream side from the outer surface 61 of hub portion 60 toward the outside in turning radius direction towards the flow direction of air-flow extends.

Flabellum front end 71 is positioned at (front side) foremost of the flabellum 70 of sense of rotation (direction of arrow A R1), and is positioned at the outermost in the turning radius direction of front edge 72.Flabellum front end 71 is the parts connecting front edge 72 and edge, periphery 76, is the part that radius of curvature is minimum between front edge 72 and edge, periphery 76.

Hinder marginal part 74 is positioned at the rear side of the sense of rotation of flabellum 70, forms the trailing edge of the flabellum 70 in sense of rotation.When watching propeller type fan 50 from the direction parallel with running shaft 80 (in other words, when overlooking propeller type fan 50), hinder marginal part 74 with back root part 73R for the inner side of starting point from turning radius direction extends towards equidirectional outside.When watching propeller type fan 50 from the direction orthogonal with running shaft 80 (in other words, when watching propeller type fan 50 from the side), hinder marginal part 74 with back root part 73R for starting point, along with the slightly upstream side from the outer surface 61 of hub portion 60 toward the outside in turning radius direction and towards the flow direction of air-flow extends.

Periphery rearward end 75 is positioned at the outermost in the turning radius direction of hinder marginal part 74.Periphery rearward end 75 is the parts connecting hinder marginal part 74 and edge, periphery 76, is the part that radius of curvature is minimum between hinder marginal part 74 and edge, periphery 76.Edge, periphery 76 extends along the sense of rotation (circumference centered by running shaft 80) of flabellum 70, arranges in the mode connected between flabellum front end 71 and periphery rearward end 75.Edge, periphery 76 extends with roughly arc-shaped as a whole between flabellum front end 71 and periphery rearward end 75.When watching propeller type fan 50 from the direction parallel with running shaft 80 (in other words, when overlooking propeller type fan 50), the size between running shaft 80 (upstream end thereof 62) and flabellum front end 71 is less than the size between running shaft 80 (upstream end thereof 62) and periphery rearward end 75.

Flabellum front end 71, front edge 72, root 73, hinder marginal part 74, periphery rearward end 75 and edge, periphery 76 form the periphery of flabellum 70.The flabellum face of flabellum 70 is formed in the whole region of the inner side in the region surrounded by this periphery.The flabellum mask of flabellum 70 has front edge 72 to be positioned at the upstream side of the flow direction of air-flow and hinder marginal part 74 is positioned at the shape in the downstream side of the flow direction of air-flow.The flabellum face of flabellum 70 is to be formed towards the mode that ejiction opening 16 (with reference to Fig. 1, Fig. 2) side is bending smoothly as a whole from suction port 15 (with reference to Fig. 1, Fig. 2) side along with from front edge 72 toward hinder marginal part 74.

With reference to Fig. 3, preferably the straight line connecting flabellum front end 71 and back root part 73R is set to angled straight lines LF, when angled straight lines LF and the plane angulation parallel with running shaft 80 are set to θ A, the relation of 25≤θ A≤45 is set up.Angle θ A refers to and is describing to comprise angled straight lines LF and the plane extended along the direction parallel with running shaft 80, also describe the plane extended along the direction orthogonal with running shaft 80, when describing the intersection formed each other by above-mentioned 2 planes, be formed in the angle between this intersection and angled straight lines LF.In the present embodiment, θ A=33.6 °.

At propeller type fan 50 just when rotated, the face of ejiction opening 16 side in the flabellum face of flabellum 70 forms pressure surface, the face of the suction port 15 in the flabellum face of flabellum 70 forms suction surface.At propeller type fan 50 just when rotated, the flabellum face of flabellum 70 produces the air-flow flowed from suction port 15 towards ejiction opening 16.At propeller type fan 50 just when rotated, produce air stream along with on flabellum face, produce and relatively become pressure distribution that is large, that relatively diminish on suction surface on pressure surface.

On the direction parallel with running shaft 80, flabellum 70 has height dimension ha and height dimension hb.Height dimension ha is the size between the position (being back root part 73R in flabellum 70) of the most downstream side of flabellum 70 and the position of front root 73F on the direction parallel with running shaft 80.Height dimension hb is the size between the position (being back root part 73R in flabellum 70) of the most downstream side of flabellum 70 and the position of flabellum front end 71 on the direction parallel with running shaft 80.

When watching propeller type fan 50 from the direction orthogonal with running shaft 80 (in other words, when watching propeller type fan 50 from the side), front edge 72 with the front end of the sense of rotation in root 73 (front root 73F) for starting point, along with the upstream side from the outer surface 61 of hub portion 60 toward the outside in turning radius direction and towards the flow direction of air-flow extends.The value of preferred hb/ha is more than 1.5, is 2.20 in the present embodiment.

Along with flabellum 70 rotates, near the flabellum front end 71 of flabellum 70, produce flabellum front end whirlpool.This flabellum front end whirlpool produces in the mode extended towards the rear side of sense of rotation (direction of arrow A R1) for front end near flabellum front end 71.The flabellum front end 71 of flabellum 70 is formed at the position of the downstream away from flabellum 70 in the mode meeting hb/ha >=1.5, the occurrence positions of flabellum front end whirlpool and flabellum 70 downstream (hinder marginal part 74) near generation whirlpool occurrence positions between distance elongated.Meet hb/ha >=1.5, the width of the wind path that can flow swimmingly towards ejiction opening from the air of suction port thus broadens, and air also diminishes relative to the reference angle of the internal face of inner casing.Said reference angle refers to when contacting with the internal face of inner casing from the air of suction port herein, the angle formed between the flow direction and the internal face of inner casing of this air.

If meet hb/ha >=1.5, then when contacting with the internal face of inner casing from the air of suction port, also rebound hardly even if contact towards the flowing in the outside in turning radius direction and the internal face of inner casing.The air flowed along outer surface 61 also can not enter inner side, and the air former state contacted with the internal face of inner casing flows towards downstream side.Thus, the foreign matters such as hair can be suppressed efficiently to be wound in the output shaft 31 of drive motor 30 by meeting hb/ha >=1.5.

(detailed construction of flabellum 70)

Fig. 5 is the plan view of the flabellum 70 representing propeller type fan 50 in detail.When overlooking flabellum 70 from the direction parallel with running shaft 80, depicting and there is center and the circumcircle CR circumscribed with flabellum 70 in the position of running shaft 80.Circumcircle CR represents with single dotted broken line in Figure 5.Circumcircle CR refers to the minimum circle comprising 3 flabellums 70 within it.The position consistency of the center of circumcircle CR and the upstream end thereof 62 of hub portion 60.

(12≤γ/n≤17)

The straight line at the center and flabellum front end 71 that connect circumcircle CR is set to the 1st straight line L1, the intersection point of the 1st straight line L1 and circumcircle CR is set to the 1st P1, the straight line at the center and periphery rearward end 75 that connect circumcircle CR is set to the 2nd straight line L2, the intersection point of the 2nd straight line L2 and circumcircle CR is set to the 2nd P2.The length circumferentially of the circular arc be formed between the 1st P1 and the 2nd P2 in circumcircle CR is set to Lm, to be positioned on circumcircle CR and be set to the 3rd P3 from the point that the 1st P1 leaves the amount of the length of the circumference along (0.1 × Lm), the straight line at the center and the 3rd P3 that connect circumcircle CR is set to the 3rd straight line L3, the intersection point of the 3rd straight line L3 and front edge 72 is set to inner side reference point Q1, the intersection point of the 3rd straight line L3 and edge, periphery 76 is set to outside reference point Q2.

When the interior angle formed when inner side reference point Q1, flabellum front end 71 and outside reference point Q2 being connected with straight line according to this order is set to γ, the relation of 12≤γ/n≤17 is set up.N is the integer of more than 2, is the number of the flabellum 70 being equipped on propeller type fan 50.Interior angle γ is equivalent to the degree of the point of flabellum front end 71 when overlooking flabellum 70, flabellum 70.In the present embodiment, be n=3, γ=47 °, γ/n=15.667.

(0.4≤Ln/Lm≤0.7)

Edge, periphery 76 comprises the midway part P4 be positioned on circumcircle CR.Midway part P4 refers to when from rearward end 75 side, flabellum front end 71 side direction periphery viewing periphery edge 76, is positioned at the position that edge, periphery 76 intersects with circumcircle CR at first.That is, the flabellum front end 71 in edge, periphery 76 and the part between the part P4 of midway have with along with from flabellum front end 71 toward midway part P4 away from the shape of the mode at the center of circumcircle CR to the outer expandable in turning radius direction.

When the length circumferentially of the circular arc be formed between the 1st P1 and midway part P4 in circumcircle CR is set to Ln, the relation of 0.4≤Ln/Lm≤0.7 is set up.Ln/Lm represent edge, periphery 76 enter towards flabellum front end 71 from periphery inner side part account for great ratio relative to edge, periphery 76.The value of Ln/Lm is larger, more becomes the shape entering inner side.In the present embodiment, be Ln/Lm=0.587.

(0.8≤R1/R0≤0.9)

And be set to R1 in the length of the line segment by the center and flabellum front end 71 that connect circumcircle CR, when the radius of circumcircle CR is set to R0, the relation of 0.8≤R1/R0≤0.95 is set up.In the present embodiment, be R1/R0=0.904.Formation flabellum 70 as implied above.

(effect)

Fig. 6 and Fig. 7 is the plan view and the side view that represent propeller type fan 50 appearance just when rotated respectively.Flabellum 70 meets the relation of 12≤γ/n≤17, has the shape that front end attenuates near flabellum front end 71.Thus, the whirlpool diameter of the flabellum front end whirlpool (thick-line arrow with reference in figure) produced for starting point with flabellum front end 71 diminishes.Consequently, the energy grow of whirlpool, can make directly blowing property high and the wind with high wind pressure arrives at a distance.

Fig. 8 and Fig. 9 is plan view and the side view of the propeller type fan 50Z of the comparative example representing mode of execution 1 respectively.Propeller type fan 50Z possesses hub portion 60Z and 7 flabellum 70Z.The outer surface 61 of hub portion 60 has dome shape.Describing the circumcircle CR circumscribed with flabellum 70Z, the length of the line segment at the center and flabellum front end 71 that connect circumcircle CR is set to R1, when the radius of circumcircle CR is set to R0, is the relation that R1 ≈ R0, flabellum 70Z do not meet 0.8≤R1/R0≤0.95.

Figure 10 is the plan view of the flabellum 70Z representing propeller type fan 50Z in detail.In the same manner as mode of execution 1, when calculating angle γ (not shown) at definition the 3rd straight line L3, inner side reference point Q1 and outside reference point Q2 etc., be γ=80 ° in flabellum 70Z.That is, when flabellum 70Z, the flabellum front end whirlpool (thick-line arrow with reference in figure) produced for starting point with flabellum front end 71 leaves from flabellum face, and whirlpool diameter becomes large compared with the situation of mode of execution 1.Consequently, due to the energy dissipation of whirlpool, so the energy contributing to the whirlpool directly blown dies down compared with the situation of mode of execution 1, not easily make directly blowing property high and the wind with high wind pressure arrives at a distance.

Figure 11 is that blast device for contrasting mode of execution 1 and comparative example thereof is just at the figure of the appearance of action.When mode of execution 1, produce strong swirl components by acting on the wind blown out from exit opening 14 of flabellum 70, can give strong rotation composition (V θ) thus to wind, the energy that wind can be made to have rises.When mode of execution 1, wind is as shown in single dotted broken line BL1, high and be blown under the state with high wind pressure in directly blowing property.

Even if when the situation of mode of execution 1 identical with being configured to initial velocity Vz when comparative example (even if that is, make air quantity equal), be rotated into point (V θ) also more weak when comparative example, therefore whirlpool can dissipation, and the energy that wind has is little.When comparative example, wind cannot spread and dry up scalp efficiently.When comparative example, wind is as shown in dotted line BL2, low and be blown under the state with weak blast in directly blowing property.On the other hand, when mode of execution 1, due to strong swirl components, the energy of wind rises, and wind arrives scalp completely.That is, the air density of the wind blown out from exit opening 14 is being set to ρ, will be rotated into and be divided into V θ, when initial velocity is set to Vz, between mode of execution 1 and comparative example, following formula is set up.In addition, the size LL1 in figure is such as 3cm, size LL2 is 15cm.(1/2)×ρ×Vz ²＜{(1/2)×ρ×Vz ²+(1/2)×ρ×Vθ ²}

The blast device 100 of mode of execution 1, not only for drying and the moulding of hair, can also dry up scalp fully.On scalp, miscellaneous bacteria both can not be bred, and can also suppress to cause head to itch fully, eczema or stink etc.Due to without the need to making blast device 100 near scalp, the scalp therefore also almost caused by heat over-drying or cause the possibility of damage of the hair near scalp.

In order to realize making wind arrive scalp while the damage suppressing hair, considering that the static pressure improving fan prolongs long range formation, but in this case, worrying to be involved in hair from suction port.According to blast device 100, can be high and the wind with high wind pressure does not extend range with improving the static pressure of fan by directly blowing property, therefore do not have above-mentioned worry yet.As prolonging long range method with not improving static pressure, also consider the formation reducing blow-off outlet to improve blowout wind speed, but air quantity reducing in this case, therefore only cannot be made the air quantity that scalp is dry fully.According to blast device 100, do not have above-mentioned worry yet.

With reference to Figure 12 and Figure 13, further illustrate the relation of 12≤γ/n≤17.In this inequality, remove angle γ with the number n of flabellum.In Figure 12 and Figure 13, illustrate the propeller type fan 50A possessing flabellum 70A and hub portion 60A.In flabellum 70A, when the straight line connecting flabellum front end 71 and back root part 73R is set to angled straight lines LF, angled straight lines LF and the angled θ B of the plane shape parallel with running shaft 80.

Have the fan of identical diameter and identical height when the number n of flabellum becomes many, the inclination (≈ angle θ B) of flabellum becomes precipitous.That is, the intensity of the flabellum front end whirlpool produced by flabellum front end 71 to be come to a point relative to the angle of spread of flabellum by the front end of flabellum and how much decides.It is determined by the number of flabellum that the angle of spread is got much.When flabellum is 3, the maximum value of the angle of spread is 120 °, and when flabellum is 4, the maximum value of the angle of spread is 90 °.That is, the angle of spread is 360 values obtained divided by the number of flabellum.

Have the fan of identical diameter and identical height when the number n of flabellum becomes many, the inclination (≈ angle θ B) of flabellum becomes precipitous.In order to compare the angle γ of the degree of the point of the flabellum representing flabellum front end 71, correct with the number n of flabellum.Therefore, evaluate divided by n with γ.As mentioned above, and not there is the wind facies ratio rotating composition, rotating composition by giving the speed of wind, thus, wind directly to blow personality other places high, flabellum front end whirlpool is elongated, and wind energy gets at and reaches scalp.Although the degree of the point of flabellum front end affects the range of wind significantly, when exceeding desirably thicker in the front end of flabellum, flabellum front end whirlpool also becomes thicker greatly, is easy to dissipation at the rear of flabellum, does not have directly the blowing property arriving scalp degree.In addition, fan blade area increases, even if but more than increase to a certain degree also can become resistance, therefore air quantity does not increase.On the contrary, when point is crossed in flabellum front end, air quantity reduces.When the whirlpool produced is meticulous, the kinetic energy of whirlpool can die down.In view of foregoing, change the value of γ/n in order to evaluate γ/n, after carrying out the measurement of air quantity and above-mentioned area, known 12≤γ/n≤17 are most suitable.Below be described particularly.

With reference to Figure 14 ~ Figure 17, the experiment that the relation about 12≤γ/n≤17 is carried out and result thereof are described.Figure 14 is the plan view of the model representing this experiment.The number n of flabellum 70 is 3.As shown in line 72A, the 72B in figure, making by carrying out various change to the shape of front edge 72 position of inner side reference point Q1 become the position of some Q1A, Q1B, changing the value of γ/n.Do not change flabellum front end 71, edge, periphery 76, the position of periphery rearward end 75 and hinder marginal part 74 and shape.The rotating speed of propeller type fan is 14000rpm, fan diameter for 63mm, fan height is 30mm, and upper numerical value is all set to fixed value.

Change the value of γ/n and measure now firm air quantity (with reference to Figure 15) after blow-off outlet blowout.Air quantity is set to and obtains relative value and the firm air quantity after blow-off outlet blowout obtained during γ=80 ° is set to reference value 1.In addition, the mean value of firm wind speed after blow-off outlet blowout is set to V0, changes γ, measure the area (with reference to Figure 16) of the part of the speed of 0.9 times keeping wind speed V0 at distance blow-off outlet 15cm place.Be set to and also obtain relative value for this area, the area that distance blow-off outlet 15cm place during γ=80 ° becomes 0.9 × V0 is set to reference value 1.

With reference to Figure 15, known when γ/n is less than 10 air quantity reduce.When γ/n is more than 10, do not see the change of air quantity.With reference to Figure 16, known if 12≤γ/n≤17, then 0.9 times of initial velocity can be maintained with the area more than about 2 times (2.5 times) of γ=80 °.Thus, can say that what do not obtain significant effect with reducing air quantity is 12≤γ/n≤17.

With reference to Figure 17, the relation about air quantity and noise is also verified.When γ/n=17.9, be 2.0m at air quantity ³during/min, noise is 62.9dB, is 2.5m at air quantity ³during/min, noise is 68.9dB.On the other hand, when γ/n=15.7, be 2.0m at air quantity ³during/min, noise is 61.3dB, is 2.5m at air quantity ³during/min, noise is 67.1dB.By change γ/n and obtain on the whole more than 1dB, at 2.5m ³the effect of the noise reduction of about 1.8dB is obtained during/min.That is, known when γ/n is 15.7, compared with the situation being 17.9 with γ/n, noise reduction.

With reference to Figure 18 ~ Figure 22, further illustrate the relation of 0.4≤Ln/Lm≤0.7.As mentioned above, Ln/Lm represent edge, periphery 76 enter towards flabellum front end 71 from periphery inner side part account for how many ratios relative to edge, periphery 76.In figure 18, the propeller type fan 50A1 possessing flabellum 70A1 and hub portion 60A1 is illustrated.The midway part P4A of flabellum 70A1 is positioned near periphery rearward end 75 compared with the situation of above-mentioned mode of execution 1, and flabellum 70A does not meet the relation of 0.4≤Ln/Lm≤0.7.In the position of midway part P4A, not easily form good flabellum front end whirlpool, not easily improve directly blowing property etc.

The propeller type fan 50A2 possessing flabellum 70A2 and hub portion 60A2 is illustrated in Figure 19.The midway part P4B of flabellum 70A2 is positioned near flabellum front end 71 compared with the situation of above-mentioned mode of execution 1, and flabellum 70B does not also meet the relation of 0.4≤Ln/Lm≤0.7.In the position of midway part P4B, flabellum front end 71 is close to circumcircle CR, and flabellum front end whirlpool is easy to decay, not easily improves directly blowing property etc.

The experiment and result thereof carried out about the relation of 0.4≤Ln/Lm≤0.7 are described with reference to Figure 20 ~ Figure 22.Figure 20 is the plan view of the model representing this experiment.The number n of flabellum 70 is 3.As shown in line 76A, the 76B in figure, carry out various change by the shape of external peripheral portion 76 and change the value of Ln/Lm.The position of flabellum front end 71 is set to fixing, and the angle γ of flabellum front end 71 is 47 °, and the rotating speed of propeller type fan is 14000rpm, fan diameter for 63mm, fan height is 30mm, and upper numerical value is all set to fixed value.

Change the value of Ln/Lm and measure now firm air quantity (with reference to Figure 21) after blow-off outlet blowout.Air quantity is set to and obtains relative value and the firm air quantity after blow-off outlet blowout obtained during Ln/Lm=1 is set to reference value 1.In addition, the mean value of firm wind speed after blow-off outlet blowout is set to V0, changes the value of Ln/Lm, measure the area (with reference to Figure 21) of the part of the speed of 0.9 times keeping wind speed V0 at distance blow-off outlet 15cm place.Be set to and also obtain relative value for this area and area distance blow-off outlet 15cm place during Ln/Lm=1 being become 0.9 × V0 is set to reference value 1.

With reference to Figure 21, known when Ln/Lm is less than 0.7 air quantity reduce.When 0.4≤Ln/Lm≤0.7, do not see the change of air quantity.With reference to Figure 22, known if 0.4≤Ln/Lm≤0.7, then the increase of expectation about about 10% compared with the situation of Ln/Lm=1.Thus, can say that what obtain suitable effect is 0.4≤Ln/Lm≤0.7 with reducing air quantity hardly.

That is, when the value of Ln/Lm is excessive, reduce with the area of the flabellum of the external lateral portion work of the radial direction in flabellum, the ability of fan reduces.On the contrary, when the value of Ln/Lm is too small, become until flabellum front end near the large shape of radius, the position of the flabellum front end whirlpool produced from flabellum front end becomes the outside of radial direction.Consequently, the flabellum front end whirlpool rearward sprayed and housing collide, and the kinetic energy that whirlpool has is lost by the friction with housing.Think that directly the blowing property of wind and range reduce thus.

With reference to Figure 23 ~ Figure 25, the experiment that the relation about 0.8≤R1/R0≤0.95 is carried out and result thereof are described.R1/R0 represents the position on the turning radius direction of flabellum front end 71.R1/R0 is less, and flabellum front end 71 more enters inner side.Figure 23 is the plan view of the model representing this experiment.The number n of flabellum 70 is 3.As shown in line 71A, the 71B in figure, by carrying out to the position of flabellum front end 71 value that various change changes R1/R0.The position of midway part P4 is set to fixing, and the angle γ of flabellum front end 71 is 36 °, and the rotating speed of propeller type fan is 14000rpm, fan diameter for 63mm, fan height is 30mm, and upper numerical value is all set to fixed value.

Change the value of R1/R0 and measure now firm air quantity (with reference to Figure 24) after blow-off outlet blowout.Air quantity is set to and obtains relative value and the firm air quantity after blow-off outlet blowout obtained during R1/R0=1 is set to reference value 1.In addition, the mean value of firm wind speed after blow-off outlet blowout is set to V0, changes the value of R1/R0, measure the area (with reference to Figure 25) of the part of the speed of 0.9 times keeping wind speed V0 at distance blow-off outlet 15cm place.Be set to and also obtain relative value for this area, the area that distance blow-off outlet 15cm place during R1/R0=1 becomes 0.9 × V0 is set to reference value 1.

With reference to Figure 24, known when R1/R0 is less than 0.8 air quantity reduce.When R1/R0 is more than 0.8, do not see the change of air quantity.With reference to Figure 25, known if 0.8≤R1/R0≤0.95, then the increase of expectation about about 20% compared with the situation of R1/R0=1.Thus, what obtain suitable effect with alternatively reducing air quantity hardly is 0.8≤R1/R0≤0.95.Can saying to obtain significant effect further, being preferably set to 0.9≤R1/R0≤0.92.

That is, when the value of R1/R0 is too small, reduce with the area of the flabellum of the external lateral portion work on the radial direction in flabellum, the ability of fan reduces.On the contrary, when the value of R1/R0 is excessive, become until flabellum front end near the large shape of radius, the position of the flabellum front end whirlpool produced from flabellum front end becomes the outside of radial direction.Consequently, the flabellum front end whirlpool rearward sprayed and housing collide, and the kinetic energy that whirlpool has is lost by the friction with housing.Think that directly the blowing property of wind and range reduce thus.

When γ and Ln/Lm is set to fixing and the position of front end is moved in the radial direction, flabellum front end is more close to periphery, the position of the flabellum front end whirlpool produced from flabellum front end more becomes outside radial direction, therefore the flabellum front end whirlpool rearward sprayed and housing collide, and the kinetic energy that whirlpool has is lost by the friction with housing.Directly the blowing property of wind and range reduce thus.In addition, on the contrary, if flabellum front end too enters inner side, then flabellum front end whirlpool encounters hub portion, and the intensity of whirlpool decays by rubbing.Compared with the situation of encountering the housing in outside with flabellum front end whirlpool, when flabellum front end whirlpool encounters the hub portion of inner side, the loss brought by resistance is larger, and the intensity (kinetic energy) of whirlpool more can decay.

Thus, it is effective for arranging flabellum front end 71 in the position that flabellum front end whirlpool had both not easily also not easily occurred to rub with hub portion with housing, the flabellum 70 used in the blast device 100 of mode of execution 1 all meets the relation of 12≤γ/n≤17,0.4≤Ln/Lm≤0.7 and 0.8≤R1/R0≤0.95, the flabellum front end bent during rotation across circumferentially, can also can not occur to use fan the most efficiently in the scope disturbed with housing thus when rotated.If by wind to scalp, then the massage effect of scalp can also be obtained.Also regular movements wind etc. can be set to as scalp pattern.

As shown in figure 26, the also preferred streamline L71 described on the flabellum face of flabellum 70 through flabellum front end 71, front edge 72 and edge, periphery 76 extend in the mode that to have relative to streamline L71 be roughly symmetrical width W 71A and width 71B.Width W 71A and width 71B refer to the direction orthogonal with streamline L71, distance between streamline L71 and front edge 72 and edge, periphery 76.According to this shape, the air-supply with high directly blowing property and high wind pressure can be realized further.

[mode of execution 2]

(propeller type fan 50B)

The propeller type fan 50B of mode of execution 2 is described with reference to Figure 27 ~ Figure 38.Figure 27 is the side view representing propeller type fan 50B.Propeller type fan 50B except meet 12≤γ/n≤17 of above-mentioned mode of execution 1,0.4≤Ln/Lm≤0.7 and 0.8≤R1/R0≤0.95 relation formation except, also possess following characteristics.

Propeller type fan 50B possesses hub portion 60B and flabellum 70B.The flow direction being described in the wind generated by the rotation of flabellum 70B is positioned at the position than propeller type fan 50B downstream and the datum plane CP orthogonal with running shaft 80.When the distance of the distance datum plane CP on the direction parallel with running shaft 80 being called height, be set to h0 by forming in the position of hub portion 60B and flabellum 70B, be positioned at the part of side, most upstream on the flow direction by rotating the wind generated height, the height of flabellum front end 71 is set to h1.In the present embodiment, be h0=h1.

And the height of the part (that is, front root 73F) of being intersected with front edge 72 by hub portion 60B is set to h2, and the height of the part (that is, back root part 73R) of being intersected with hinder marginal part 74 by hub portion 60B is set to h3.The area of the sectional shape of the hub portion 60B formed when each height of h0, h1, h2, h3 hypothetically cuts off hub portion 60B (propeller type fan 50B) by the plane orthogonal with running shaft 80 is set to S0, S1, S2, S3 respectively.

Be set to δ 1=(-S0+S1)/(h0-h1), be set to δ 2=(-S1+S2)/(h1-h2), be set to δ 3=(-S2+S3)/(h2-h3), the relation of δ 1 × 0.9≤δ 2≤δ 1 × 1.1 is set to formula 1, when the relation of δ 2 × 0.9≤δ 3≤δ 2 × 1.1 is set to formula 2, in propeller type fan 50B, in formula 1 and formula 2 at least any one is set up.

Figure 28 is the figure schematically showing the flabellum 70B be configured in inner casing 12.Conveniently, in Figure 28, only hub portion 60B is illustrated.With reference to Figure 28, when the flow path area of inner casing 12 is set to A, the area closing the sectional shape of the hub portion 60B of stream is equivalent to S0, and the area A 0 (oblique line portion of the h0 in figure) therefore can passed through in height h0 windward becomes (A-S0).Similarly, the area A 1 can passed through in height h1, h2, h3 windward, A2, A3 become (A-S1), (A-S2), (A-S3) respectively.Each value of above-mentioned δ 1, δ 2, δ 3 represents the variance ratio of the enough area of process of wind energy.

Namely, be set to δ 1=(A0-A1)/(h0-h1), when the formula of A0=(A-S0) and A1=(A-S1) is substituted into this formula, obtain the formula of δ 1=(-S0+S1)/(h0-h1).Similarly, be set to δ 2=(A1-A2)/(h1-h2), when the formula of A1=(A-S1) and A2=(A-S2) is substituted into this formula, obtain the formula of δ 2=(-S1+S2)/(h1-h2).Similarly, be set to δ 3=(A2-A3)/(h2-h3), when the formula of A2=(A-S2) and A3=(A-S3) is substituted into this formula, obtain the formula of δ 3=(-S2+S3)/(h2-h3).

In the present embodiment, the relation of δ 1 × 0.9≤δ 2≤δ 1 × 1.1 is being set to formula 1, when the relation of δ 2 × 0.9≤δ 3≤δ 2 × 1.1 is set to formula 2, in formula 1 and formula 2 at least any one is set up.Close in the value of δ 1 and δ 2, when the value of δ 2 and δ 3 is close, the area of sectional shape closing the hub portion 60B of stream gradually changes, and the area of the enough process of wind energy narrows smoothly thus, therefore, it is possible to blow efficiently, the energy of the whirlpool produced in flabellum front end can be improved.Preferably the relation of δ 1 × 0.95≤δ 2≤δ 1 × 1.05 is being set to formula 1, when the relation of δ 2 × 0.95≤δ 3≤δ 2 × 1.05 is set to formula 2, in formula 1 and formula 2 at least any one is set up.Preferred δ 1=δ 2=δ 3 further.

With reference to Figure 29, on the other hand, in the propeller type fan with hub portion 60B1, the relation of δ 1 × 0.9≤δ 2≤δ 1 × 1.1 is being set to formula 1, when the relation of δ 2 × 0.9≤δ 3≤δ 2 × 1.1 is set to formula 2, any one in formula 1 and formula 2 is all false.In this case, the area steeply constriction of the enough process of wind energy, therefore not easily improves the energy of the whirlpool produced in flabellum front end.

With reference to Figure 30 ~ Figure 35, the experiment that the relation about above-mentioned formula 1 and formula 2 is carried out and result thereof are described.With reference to Figure 30 and Figure 31, in this experiment, as embodiment 1,2, the propeller type fan 50E1 (Figure 32) and the propeller type fan 50E2 (Figure 33) that possess δ 2 × 0.9≤δ 3≤δ 2 × 1.1 (formula 2) are prepared.The propeller type fan 50E1 of embodiment 1 has hub portion 60E1 and 3 flabellum 70E1, there is shape that vent area reduces according to roughly fixing ratio (in other words, being the shape that the area of sectional shape of hub portion of closed stream increases according to roughly fixing ratio) (with reference to Figure 31).Similarly, the propeller type fan 50E2 of embodiment 2 has hub portion 60E2 and 4 flabellum 70E2, has the shape (with reference to Figure 31) that vent area reduces according to roughly fixing ratio.

On the other hand, any one all invalid propeller type fan 50E3 in above-mentioned formula 1 and formula 2 (with reference to Figure 34) and propeller type fan 50E4 (reference Figure 35) has been prepared as comparative example 1,2.The propeller type fan 50E3 of comparative example 1 has hub portion 60E3 and 7 flabellum 70E3, has vent area nondecreasing shape (with reference to Figure 31) under roughly fixing ratio.Similarly, the propeller type fan 50E4 of comparative example 2 has hub portion 60E4 and 4 flabellum 70E4, has vent area nondecreasing shape (with reference to Figure 31) under roughly fixing ratio.

Make the propeller type fan of embodiment 1,2 and comparative example 1,2 after identical conditions backspin transfers checking air quantity etc., known in embodiment 1,2, the reduction amplitude of height and area is smooth, and resistance diminishes, and wind speed accelerates gradually.When the energy (potential energy) of static pressure is converted to kinetic energy, loss reduces.Knownly the energy of static pressure can be become kinetic energy and improve kinetic energy.On the other hand, in comparative example 1,2, the known part that there is area and reduce terrifically, produces loss when the energy (potential energy) of static pressure is converted into kinetic energy.

[with mode of execution 1,2 relevant experimental examples]

With reference to Figure 36 ~ Figure 38, the experimental example carried out about above-mentioned mode of execution 1,2 is described.With reference to Fig. 3, as mentioned above, preferably the straight line connecting flabellum front end 71 and back root part 73R is being set to angled straight lines LF, when angled straight lines LF and the plane angulation parallel with running shaft 80 are set to θ A, the relation of 25≤θ A≤45 is set up.Angle θ A refer to description comprise angled straight lines LF and the plane extended along the direction parallel with running shaft 80 and, also describe the plane extended along the direction orthogonal with running shaft 80, and when describing the intersection formed each other by above-mentioned 2 planes, be formed in the angle between this intersection and angled straight lines LF.

Determine air quantity (Figure 36), noise (Figure 37) and the power consumption (Figure 38) during the tilt angle theta A changing flabellum respectively.As experimental condition, the plane shape of propeller type fan is set to identical, the rotating speed of propeller type fan is set to 14000rpm.As shown in figure 36, if carry out word from the viewpoint of air quantity, known preferably 25≤θ A≤65.As shown in figure 37, if carry out word from the viewpoint of noise, known preferably 15≤θ A≤45.In addition, the value of this noise is that air quantity is set to 1.4m ³value during/min.As shown in figure 38, if carry out word from the viewpoint of power consumption, known preferably θ A≤45.In addition, the value of this power consumption is that air quantity is being set to 1.4m ³/ min, is set to disconnection by heater, value when being set to reference value 1 when being 10 ° by tiltangleθ A.

That is, when tilt angle theta A is too small, air quantity reduces, and causes the reduction of directly blowing property further.In addition, when tilt angle theta A is excessive, flows from flabellum face and peel off, the flabellum front end whirlpool produced from flabellum front end is unstable, and therefore whirlpool is understood dissipation and caused the reduction of directly blowing property.In addition, though air quantity increases to a certain extent when inclination θ A becomes large, the problem of noise and power consumption increase also can be there is.According to above content, known in order to be set to air quantity increase about 40% compared with existing shape, noise can not worsen compared with existing shape, and the increase of power consumption is less than 5%, and preferably the relation of 25≤θ A≤45 is set up.

At above mode of execution 1,2 with when diminishing due to the thin-long etc. of main body at propeller type fan with the effect illustrated in mode of execution 1,2 relevant experimental examples, also same effect can be obtained by the number increasing and decreasing flabellum.

[mode of execution 3]

(propeller type fan 50F)

The propeller type fan 50F of mode of execution 3 is described with reference to Figure 39 ~ Figure 51.Figure 39 and Figure 40 is the stereogram and the plan view that represent propeller type fan 50F respectively.Propeller type fan 50F possesses hub portion 60F and flabellum 70F.Figure 41 is the plan view representing flabellum 70F in detail.Figure 42 ~ Figure 46 is the sectional view along the XLII line in Figure 40, XLIII line, XLIV line, XLV line and XLVI line respectively.Figure 47 is another plan view representing propeller type fan 50F, and Figure 48 is the figure of the flabellum thickness of the part represented along the flabellum chord length LS1 ~ LS4 shown in Figure 47.

As shown in Figure 39 ~ Figure 48, the flabellum 70F of propeller type fan 50F is when the thickness of the flabellum by the direction parallel with running shaft 80 is called flabellum thickness, the part of the front side of the sense of rotation (direction of arrow A R1) in flabellum 70F has heavy section 78, above-mentioned heavy section 78 extends by banded in part or all the mode along front edge 72, and the part being formed as flabellum face bloats.The distance between the face of the pressure surface side of flabellum and the face of suction surface side is referred at this said flabellum thickness.The heavy section 78 that the part being preferably formed to flabellum face bloats has the shape bloated to pressure surface side, but also can have the shape bloated to pressure surface side and suction surface side both sides.

Particularly, heavy section 78 has in the shape forming maximum fan leaf thickness from front edge 72 in the scope of less than 20% of the flabellum chord length of flabellum 70F, the line described when the part being formed with maximum fan leaf thickness in heavy section 78 being connected with 1 line is set to maximum fan leaf thickness line 78M, when distance between maximum fan leaf thickness line 78M and front edge 72 is set to D by the direction of the flabellum chord length along flabellum 70F, maximum fan leaf thickness line 78M has distance D along with the inner side from turning radius direction and becomes large part gradually toward outside.Flabellum chord length means the length of the connection front edge 72 of flabellum shape and the line segment of hinder marginal part 74.Heavy section 78 has along with thickening gradually away from front edge 72, is maximum shape at the position flabellum thickness of maximum fan leaf thickness line 78M.

In the present embodiment, flabellum chord length about 5% position be formed with maximum fan leaf thickness line 78M.As shown in figure 41, when representing the length of front edge 72 with percentaeg, distance D increases until be about 30% (D1 < D2 < D3) inside distance radius direction, reduces lentamente afterwards.As shown in Figure 42 ~ Figure 44, heavy section 78 has the shape bloated to pressure surface side.As shown in Figure 45 and Figure 46, the position near flabellum front end 71 does not form heavy section 78, and the part in flabellum face does not bloat.

(effect)

Figure 49 and Figure 50 is the plan view and the side view that represent propeller type fan 50F appearance just when rotated respectively.Flabellum 70F has heavy section 78, and front end is thin and flabellum front end whirlpool that is that produce from flabellum front end 71 is little, therefore the energy of whirlpool by force and the wind that directly blowing property is high arrive at a distance.Particularly, at propeller type fan 50F just when rotated, produce strong flabellum end whirlpool, the energy grow of whirlpool from the pressure surface of flabellum 70F toward suction surface from flabellum end, the wind that therefore directly blowing property is high arrives at a distance.

At this, when flabellum end whirlpool is weak, energy meeting dissipation, directly blowing property reduces, and whirlpool can not arrive at a distance.What intervene this flabellum end whirlpool deeper is circulation.Due to the existence of heavy section 78, this circulation (circular flow) is collaborated efficiently with the flowing being involved in suction surface from pressure surface at flabellum end, after flabellum end leaves, become flabellum end whirlpool.This flabellum end whirlpool is stronger, and the energy of whirlpool is stronger, and the wind that directly blowing property is high more arrives at a distance.Thus, wind energy is enough separated hair and arrives scalp.When circulating strong, the energy grow of whirlpool, the wind that directly blowing property is high arrives at a distance.

In addition, can give wind by producing strong swirl components and rotate composition (V θ), the energy that wind has rises.On the other hand, even if make initial velocity V0 identical, even if that is, make air quantity equal, when rotating composition and being weak, above-mentioned whirlpool also can dissipation, and the energy that wind has also can diminish.Thus, by giving rotation composition to wind, directly the blowing property of wind being improved, maintaining flabellum front end whirlpool longlyer.

With reference to Figure 51, lift acts on flabellum 70F, and this lift is Δ P=ρ (Δ u) ^2/2 according to bernoulli principle, is represented by the poor Δ u of flow velocity.When flabellum face produces lift, relative to blowout wind speed, in suction surface side, relatively produce+the current difference of Δ u (m/s) by the whirlpool around flabellum, in pressure surface side, by the current difference of the whirlpool generation-Δ u (m/s) around flabellum.On flabellum face, the circulation that total flowing generating flabellum upper surface is accelerated, is connected in the whole region circulating in flabellum, brings pressure difference up and down thus, show as lift (hollow arrow in reference Figure 51) to flabellum.

As shown in figure 48, when hope maintains the wind pushing performance of fan, maximum fan leaf thickness position can be set to until flabellum chord length 20%, in addition, when paying attention to the wind pushing performance of fan with when making wind arrive the balance of scalp by strengthening the flabellum end whirlpool that results from flabellum end, preferably maximum fan leaf thickness position is set to until 15%.When the function that the flabellum end whirlpool by resulting from flabellum end makes wind arrive scalp by hope being becomed privileged, preferably maximum fan leaf thickness position being set to until 10%, obtaining significant effect thus.

In addition, as shown in D1 < D2 < D3, according to the formation with the part that width is expanded, the extreme reduction of heavy section/flabellum chord length can be prevented, suitably can strengthen the circulation in the whole region of flabellum.And, according to this formation, near root 73, the width of maximum ga(u)ge position can be expanded gradually.According to this formation, circulation can be strengthened near the radial central part will strengthening the flabellum circulated, and the increase of resistance near the root that can prevent flabellum, therefore, it is possible to more suitably strengthen the circular flow in the whole region of flabellum.

If when the formation that the distance D between the line (maximum fan leaf thickness line 78M) taking connection maximum ga(u)ge position and front edge 72 diminishes gradually, varying in size of whole region Inner eycle on the span direction of the circulation of flabellum, therefore the balance in the whole region of flabellum is destroyed, and the flabellum end whirlpool produced from flabellum end dies down.At root, flabellum chord length is short, if therefore also consider the width (length in chord length direction) too greatly arranging heavy section 78, then resistance increases, and performance reduces.In addition, in flabellum front end 71 side (outside of flabellum), circular flow is strong, if strengthen the circular flow of this part, then the balance of the circular flow in the whole region of flabellum is destroyed.

In contrast, according to flabellum 70F, become the shape also favourable to the generation of lift, the air-supply with high directly blowing property and high wind pressure can be realized, and when due to high-speed rotary then when being subject to large centrifugal force, the intensity of front root 73F also can improve, therefore, it is possible to reduce when ultra high speed rotates, damaged etc. possibility occurs.The flabellum front end bent during rotation across circumferentially, can also can not occur to use fan the most efficiently in the scope disturbed with housing thus when rotated.

(propeller type fan 50G)

Figure 52 and Figure 53 is stereogram and the plan view of the propeller type fan 50G of the comparative example representing mode of execution 3 respectively.Propeller type fan 50G possesses hub portion 60G and flabellum 70G.Figure 54 ~ Figure 58 is the sectional view along the LIV line in Figure 53, LV line, LVI line, LVII line and LVIII line respectively.Figure 59 is another plan view representing propeller type fan 50G, and Figure 60 is the figure of the flabellum thickness of the part represented along the flabellum chord length LT1 ~ LT4 shown in Figure 59.Propeller type fan 50G does not have the position of the heavy section 78 being equivalent to mode of execution 3, and has the 30% neighbouring shape (with reference to Figure 60) forming maximum fan leaf thickness of the flabellum chord length from front edge 72 to flabellum 70G.

Figure 61 and Figure 62 is the plan view and the side view that represent propeller type fan 50G appearance just when rotated respectively.In propeller type fan 50G, circulation (circular flow) less flowing with being involved in suction surface at flabellum end from pressure surface is collaborated efficiently and leaves from flabellum end and become flabellum end whirlpool.As shown in Figure 63, in propeller type fan 50G, do not form heavy section 78, therefore according to shape and the angle of attack of flabellum, generate the circular flow of the flowing accelerated (Δ u) of flabellum suction surface.Thus, produce pressure difference up and down at flabellum, produce lift.

Contrast Figure 51 and Figure 63, the speed U of main flow is identical, and the existence of heavy section 78 brings impact to the flowing near flabellum face.In the flabellum 70F of mode of execution 3, the air quantity dynamic to the suction surface effluent of flabellum 70F increases, and the flowing of the suction surface side of flabellum 70F further accelerated (the Δ u in Δ u ' the > Figure 63 in Figure 51).The air quantity dynamic to the pressure surface effluent of flabellum 70F reduces, and the flowing of the pressure surface side of flabellum 70F is decelerated further.Thus, in the flabellum 70F of mode of execution 3, the circulation of the surrounding of flabellum 70F is reinforced, and the whirlpool resulting from flabellum end is reinforced further.The energy grow of whirlpool, therefore, it is possible to realize the air-supply with high directly blowing property and high wind pressure.

[mode of execution 4]

The propeller type fan 50H of mode of execution 4 is described with reference to Figure 64 and Figure 65.Figure 64 is the plan view representing propeller type fan 50H, and Figure 65 is the plan view of the flabellum 70H representing propeller type fan 50H in detail.Propeller type fan 50H possesses hub portion 60H and 4 flabellum 70H.The diameter of propeller type fan 50H is 39mm, is highly 15mm.About the maximum fan leaf thickness line 78M of heavy section 78, in the same manner as the situation of mode of execution 3, have distance D (same with the D1 < D2 < D3 shown in Figure 41) be increased to front edge 72 about 40% and the shape reduced lentamente afterwards.

[mode of execution 5]

The propeller type fan 50H1 of mode of execution 5 is described with reference to Figure 66 and Figure 67.Figure 66 is the plan view representing propeller type fan 50H1, and Figure 67 is the plan view of the flabellum 70H1 representing propeller type fan 50H1 in detail.Propeller type fan 50H1 possesses hub portion 60H1 and 3 flabellum 70H1.About the maximum fan leaf thickness line 78M of heavy section 78, distance D is increased to about 30% (D1 < D2 < D3) of front edge 72 lentamente, from this near 100% of outside, have in the shape further expanded in the scope of less than 20% of flabellum chord length from front edge 72.

[mode of execution 6]

The propeller type fan 50H2 of mode of execution 6 is described with reference to Figure 68 and Figure 69.Figure 68 is the plan view representing propeller type fan 50H2, and Figure 69 is the plan view of the flabellum 70H2 representing propeller type fan 50H2 in detail.Propeller type fan 50H2 possesses hub portion 60H2 and 3 flabellum 70H2.About the maximum fan leaf thickness line 78M of heavy section 78, distance D is increased to about 30% (D1 < D2 < D3) of front edge 72 lentamente, from this near 100% of outside, there is the shape that distance D is fixing.

[mode of execution 7]

With reference to Figure 70, preferably when overlooking flabellum 70H3 from the direction parallel with running shaft 80, the length of the line segment connecting running shaft 80 and flabellum front end 71 is set to R1 (with reference to Fig. 5), the part of hub portion 60F and front edge 72 being intersected is set to front root 73F, the length of the line segment connecting running shaft 80 and front root 73F is set to R2, when the length being positioned at the line segment of the outermost part ZT in turning radius direction connected in running shaft 80 and heavy section 78 (not shown) is set to R3, the relation of 0.4 < (R3-R2)/(R1-R2) is set up.

That is, time near be positioned at the length of front edge 72 from front edge 72 towards (turning) some CQ that flabellum front end 71 is bending general 0.4 (40%), air-supply efficiency uprises.Thus, can circulate and the effect strengthening flabellum end whirlpool by establishing the near zone to this flex point further to play strengthening to major general's heavy section 78.In above-mentioned mode of execution 3, be (R3-R2)/(R1-R2)=0.825, meet this relation.In above-mentioned mode of execution 4 (Figure 64 and Figure 65), be (R3-R2)/(R1-R2)=0.98, meet this relation.

[the relevant with mode of execution 3 the 1st tests]

1st experiment and the result thereof of carrying out about above-mentioned mode of execution 3 is described with reference to Figure 71 ~ 76.Figure 71 is the plan view of the model representing this experiment.Propeller type fan 50J possesses hub portion 60J and 3 flabellum 70J.As shown in the dotted line in figure and single dotted broken line, various change is carried out to the position of maximum fan leaf thickness line 78M.The mutually identical value of employing is set to about distance D1, distance D2 and distance D3.That is, be provided with heavy section 78, make maximum fan leaf thickness position be located at the position of distance front edge 72 one fixed width, distance D becomes fixing from inner side toward outside.

As shown in flabellum 70J1, the flabellum 70J2 of Figure 72 ~ Figure 74, flabellum 70J3, each flabellum sectional shape modeled is set to rhombus, and maximum ga(u)ge 78K is set to 10% of the flabellum chord length C in each flabellum cross section.Demonstrate (R3-R2)/position of (R1-R2)=0.4, when maximum fan leaf thickness position is changed by 0 ~ 0.5C, the relation (Figure 75) of maximum fan leaf thickness position and air-supply efficiency, also demonstrate the relation (Figure 76) of maximum fan leaf thickness position and the area in the part of the speed of 0.9 times of distance blow-off outlet 15cm place maintenance wind speed V0.About air-supply efficiency and above-mentioned area, the situation of fan blade type when maximum fan leaf thickness line 78M being present in the position of 0.3 × flabellum chord length C, as reference value 1, represents relative value.

With reference to Figure 75, about air-supply efficiency, the known position at 0.3 × flabellum chord length C is provided with maximum fan leaf thickness, become maximum.Known maximum fan leaf thickness position is in the scope of 0 ~ 0.2 × flabellum chord length C, and more close to 0, air-supply efficiency gets over reduction about 10%.

With reference to Figure 76, on the other hand, about the area of the part of the speed of 0.9 times at distance blow-off outlet 15cm place maintenance wind speed V0, knownly to increase when maximum fan leaf thickness position is less than the position of 0.3 × flabellum chord length C.Thus, known by more forward than 0.3 × flabellum chord length C for maximum fan leaf thickness position setting is made such as to improve as the function of blower, the performance drying up scalp is improved.

According to above content, it is known when hope maintains the wind pushing performance of fan, maximum fan leaf thickness position can be set to 15% ~ 20% of flabellum chord length, in addition, when paying attention to the wind pushing performance of fan and resulting from the flabellum end whirlpool of flabellum end by strengthening and make wind arrive the balance of scalp, preferably maximum fan leaf thickness position is set to 10% ~ 15% of flabellum chord length.When the function that the flabellum end whirlpool by resulting from flabellum end makes wind arrive scalp by hope being becomed privileged, preferably maximum fan leaf thickness position being set to 5% ~ 10% of flabellum chord length, obtaining significant effect thus.

[the relevant with mode of execution 3 the 2nd tests]

2nd experiment and the result thereof of carrying out about mode of execution 3 is described with reference to Figure 77 and Figure 78.Figure 77 is the plan view of the model representing this experiment.Propeller type fan 50K possesses hub portion 60K and 3 flabellum 70K.As shown in the dotted line in figure and single dotted broken line, various change is carried out to the position of maximum fan leaf thickness line 78M.About the routine K0 of checking (not shown), be set to the position that maximum fan leaf thickness line 78M is present in 0.3 × flabellum chord length C.

About checking routine K1, be set to maximum fan leaf thickness line 78M be located at from front edge 72 to flabellum chord length 20% scope in, above-mentioned distance D reduces from inner side toward outside (width constriction).About checking routine K2, be set to maximum fan leaf thickness line 78M be located at from front edge 72 to flabellum chord length 20% scope in, above-mentioned distance D is fixing from inner side toward outside, and heavy section 78 disappears smoothly afterwards.About checking routine K3, be set to maximum fan leaf thickness line 78M be located at from front edge 72 to flabellum chord length 20% scope in, above-mentioned distance D increases from inner side toward outside (width expansion), and heavy section 78 disappears smoothly afterwards.In each checking example, the area of 0.9 times of the maintenance initial velocity of the position at measuring distance blow-off outlet 15cm place, is set to 1 and realize nondimensionalization by area when verifying example 1.

With reference to Figure 78, when verifying routine K3, obtain significant effect.Think that its reason is the balance of the circulation can guaranteeing the whole region of flabellum.As verified shown in routine K1, it is known when distance D reduces toward outside, due to the varying in size of whole region Inner eycle stream of the radial direction of the circular flow at flabellum, therefore the balance in the whole region of flabellum is destroyed, and the flabellum end whirlpool produced from flabellum end dies down.In this case, the flabellum chord length of root is short, therefore also thinks if too greatly arrange the width (length on flabellum chord length direction) of heavy section, then resistance can increase and performance can reduce.

On the other hand, as verify routine K2 situation shown in, when distance D is fixing, the fast position of outside radial direction, peripheral velocity is compared with near root, reynolds' number becomes large (Rn=L × U ÷ ρ), thinks that the stripping that flowing can occur, resistance become large thus.That is, by adopting the formation as the routine K4 of checking, can strengthen circulating while suppressing the resistance produced, flabellum face gradually and change smoothly.Can blow efficiently, the reduction amplitude of heavy section becomes smooth, can also reduce resistance.

[the relevant with mode of execution 3 the 3rd tests]

Can be, the flabellum thickness being formed with the part of maximum fan leaf thickness in heavy section 78 is being set to Tmax, the length of the flabellum chord length of flabellum is set to C, when the flabellum thickness being the position of 0.3 × C by the distance front edge 72 in flabellum is set to Tn, the relation of (Tmax/Tn) < 1.35 is set up.Verify about this content.

As experimental condition, it is the position of 5% that maximum fan leaf thickness position is set to distance front edge 72, above-mentioned distance D is set to and increases toward outside from inner side, it is about 30% that distance D is increased to inside the radial direction apart from the front edge 72 of flabellum, reduce lentamente afterwards, heavy section 78 is set to the flabellum shape disappeared in the position of (R3-R2)/(R1-R2)=0.825.

Compared with flabellum thickness (Tn) when being located at the position of 0.3 × C with maximum fan leaf thickness position, to make than 0.2 × C ratio (Tmax/Tn) of maximum fan leaf thickness (Tmax) that (front edge 72 side) is arranged on the front be fixing in each flabellum face and change the value of Tmax/Tn, measure respectively fan air-supply efficiency (Figure 79) and as directly blowing property index at the area (Figure 80) becoming 0.9 × V0 apart from blow-off outlet 15cm place.The situation of Tmax/Tn=1 is set to reference value 1.

With reference to Figure 79, when Tmax/Tn is greater than 1.35, wind pushing performance reduces a little.Think that its reason is the thickness increase of the shape near flabellum front end, thus flowing is peeled off.When Tmax/Tn is greater than 1.35, noise also increases significantly.On the other hand, with reference to Figure 80, known when Tmax/Tn less than 1.35 strengthened and circulate and strengthen the sufficient effect of flabellum end whirlpool.

If synthetically consider above each mode of execution, then find out formation such as follows.The diameter of propeller type fan is 39mm, is highly 15mm, and flabellum number is 4.Make distance D be increased to distance flabellum radial direction inside be about 40%, reduce lentamente afterwards.(R3-R2) value that the value of/(R1-R2) is set to 0.98, Tmax/Tn is 1.06.γ=59 °, γ/n=14.7.Ln/Lm=0.498, R1/R0=0.918.δ 1=21.4, δ 2=21.5, θ A=32.4 °.

Be explained above based on the embodiments of the present invention and each experimental example, but this time disclosed each mode of execution and each experimental example are example but not restricted contents in whole.Technical scope of the present invention is represented by claims, is intended to comprise all changes in the implication and scope that are equal to claims.

description of reference numerals

10 main parts; 11 shells; 12 inner casings; 13 inlet opens; 14 exit openings; 15 suction ports; 16 ejiction openings; 17 heaters; 20 handles; 23 operation units; 30 drive motor; 31 output shafts; 40 rectification flabellums; 42 plate-like portions; 43 upstream edge edges; 44 motor support portions; 50,50A, 50A1,50A2,50B, 50E1,50E2,50E3,50E4,50F, 50G, 50H, 50H1,50H2,50J, 50K, 50Z propeller type fan; 60,60A, 60A1,60A2,60B, 60B1,60E1,60E2,60E3,60E4,60F, 60G, 60H, 60H1,60H2,60J, 60K, 60Z hub portion; 61 outer surfaces; 62 upstream end thereof; 64 upstream faces; 65 downstream; 66 downstream faces; 67 downstream portions; 68 internal surfaces; 69 bearing portions; 70,70A, 70A1,70A2,70B, 70E1,70E2,70E3,70E4,70F, 70G, 70H, 70H1,70H2,70H3,70J, 70J1,70J2,70J3,70K, 70Z flabellum; 71 flabellum front ends; 72 front edges; 73 roots; Root before 73F; 73R back root part; 74 hinder marginal parts; 75 periphery rearward end; 76 edge, peripheries; 78 heavy sections; 78K maximum ga(u)ge; 78M maximum fan leaf thickness line; 80 running shafts; 100 blast devices; C, LS1 ~ LS4, LT1 ~ LT4 flabellum chord length; CP datum plane; CR circumcircle; D, D1, D2, D3 distance; L1 the 1st straight line; L2 the 2nd straight line; L3 the 3rd straight line; L71 streamline; LF angled straight lines; LL1, LL2 size; P1 the 1st point; P2 the 2nd point; P3 the 3rd point; P4, P4A, P4B midway part; Reference point inside Q1; Reference point outside Q2.

Claims (5)

1. a propeller type fan, it is subject to rotating power and rotates around imaginary running shaft, and the feature of above-mentioned propeller type fan is to possess:

Hub portion; And

N (n is the integer of more than 2) individual flabellum, it extends from above-mentioned hub portion to the outside in turning radius direction,

Above-mentioned flabellum comprises:

Flabellum front end, it is positioned at sense of rotation foremost;

Front edge, it extends to above-mentioned hub portion from above-mentioned flabellum front end, forms the leading edge of the above-mentioned flabellum of sense of rotation;

Hinder marginal part, it is arranged than the rear side of above-mentioned front edge by sense of rotation, extends from above-mentioned hub portion towards the outside in turning radius direction, forms the trailing edge of the above-mentioned flabellum of sense of rotation;

Periphery rearward end, it is positioned at the end in the outside in the turning radius direction of above-mentioned hinder marginal part; And

Edge, periphery, it connects above-mentioned flabellum front end and above-mentioned periphery rearward end, forms the outer periphery of the above-mentioned flabellum in turning radius direction,

When overlooking above-mentioned flabellum from the direction parallel with above-mentioned running shaft,

The position being depicted in above-mentioned running shaft has center and the circumcircle circumscribed with above-mentioned flabellum,

The straight line connecting above-mentioned center and above-mentioned flabellum front end is set to the 1st straight line,

Above-mentioned 1st straight line and above-mentioned circumscribed intersection point are set to the 1st point,

The straight line connecting above-mentioned center and above-mentioned periphery rearward end is set to the 2nd straight line,

Above-mentioned 2nd straight line and above-mentioned circumscribed intersection point are set to the 2nd point,

The length circumferentially of the circular arc be formed between above-mentioned 1st and above-mentioned 2nd in above-mentioned circumcircle is set to Lm,

To be positioned on above-mentioned circumcircle and be set to the 3rd point from above-mentioned 1st point leaving the amount of the length of the circumference along (0.1 × Lm),

The straight line connecting above-mentioned center and at above-mentioned 3rd is set to the 3rd straight line,

The intersection point of above-mentioned 3rd straight line and above-mentioned front edge is set to inner side reference point,

The intersection point of above-mentioned 3rd straight line and edge, above-mentioned periphery is set to outside reference point,

When the interior angle formed when above-mentioned inner side reference point, above-mentioned flabellum front end and above-mentioned outside reference point being connected with straight line according to this order is set to γ, the relation of 12≤γ/n≤17 is set up,

Edge, above-mentioned periphery comprises the midway part be positioned on above-mentioned circumcircle,

Part between above-mentioned flabellum front end in edge, above-mentioned periphery and above-mentioned middle part divide have with along with dividing from above-mentioned flabellum front end toward above-mentioned middle part away from the shape of the mode at above-mentioned center to the outer expandable in turning radius direction,

When the length circumferentially of the circular arc be formed in above-mentioned 1st o'clock between above-mentioned middle part minute in above-mentioned circumcircle is set to Ln, the relation of 0.4≤Ln/Lm≤0.7 is set up,

The length of the line segment connecting above-mentioned center and above-mentioned flabellum front end is being set to R1,

When above-mentioned circumscribed radius is set to R0, the relation of 0.8≤R1/R0≤0.95 is set up.

2. propeller type fan according to claim 1, wherein,

Be depicted in the flow direction by rotating the wind generated is positioned at than above-mentioned propeller type fan downstream and with the datum plane of above-mentioned rotating shaft direct cross,

When the distance of the distance said reference plane by the direction parallel with above-mentioned running shaft is called height,

H0 is being set to by forming in the position of above-mentioned hub portion and above-mentioned flabellum, be positioned at the part of side, most upstream on the flow direction by rotating the wind generated height,

The height of above-mentioned flabellum front end is set to h1,

The height of the part of above-mentioned hub portion being intersected with above-mentioned front edge is set to h2,

The height of the part of above-mentioned hub portion being intersected with above-mentioned hinder marginal part is set to h3,

The area of the sectional shape of the above-mentioned hub portion formed when each height of h0, h1, h2, h3 hypothetically cuts off above-mentioned hub portion by the plane with above-mentioned rotating shaft direct cross is set to S0, S1, S2, S3 respectively,

Be set to δ 1=(-S0+S1)/(h0-h1),

Be set to δ 2=(-S1+S2)/(h1-h2),

Be set to δ 3=(-S2+S3)/(h2-h3),

The relation of δ 1 × 0.9≤δ 2≤δ 1 × 1.1 is set to formula 1,

When the relation of δ 2 × 0.9≤δ 3≤δ 2 × 1.1 is set to formula 2,

At least any one formula in formula 1 and formula 2 is set up.

3. a propeller type fan, it is subject to rotating power and rotates around imaginary running shaft, and the feature of above-mentioned propeller type fan is to possess:

Hub portion; And

Multiple flabellum, it extends from above-mentioned hub portion to the outside in turning radius direction,

Above-mentioned flabellum comprises:

Flabellum front end, it is positioned at sense of rotation foremost;

Front edge, it extends to above-mentioned hub portion from above-mentioned flabellum front end, forms the leading edge of the above-mentioned flabellum of sense of rotation;

Hinder marginal part, it is arranged than the rear side of above-mentioned front edge by sense of rotation, extends from above-mentioned hub portion towards the outside in turning radius direction, forms the trailing edge of the above-mentioned flabellum of sense of rotation;

Periphery rearward end, it is positioned at the end in the outside in the turning radius direction of above-mentioned hinder marginal part; And

Edge, periphery, it connects above-mentioned flabellum front end and above-mentioned periphery rearward end, forms the outer periphery of the above-mentioned flabellum in turning radius direction,

When the thickness of the above-mentioned flabellum by the direction parallel with above-mentioned running shaft is called flabellum thickness,

The part of the front side of the sense of rotation in above-mentioned flabellum has heavy section, and above-mentioned heavy section extends by banded in part or all the mode along above-mentioned front edge, and the part being formed as flabellum face bloats,

Above-mentioned heavy section has in the shape forming maximum fan leaf thickness from above-mentioned front edge in the scope of less than 20% of the flabellum chord length of above-mentioned flabellum,

The line described when the part being formed with maximum fan leaf thickness in above-mentioned heavy section being connected with 1 line is set to maximum fan leaf thickness line,

When distance between the above-mentioned maximum fan leaf thickness line in the direction along flabellum chord length at above-mentioned flabellum and above-mentioned front edge is set to D,

Above-mentioned maximum fan leaf thickness line has distance D and becomes large part along with from the inner side in turning radius direction gradually toward outside.

4. propeller type fan according to claim 3, wherein,

The flabellum thickness being formed with the part of maximum fan leaf thickness in above-mentioned heavy section is being set to Tmax,

The length of the flabellum chord length of above-mentioned flabellum is set to C,

When the flabellum thickness of the position of above-mentioned for the distance in above-mentioned flabellum front edge 0.3 × C is set to Tn,

(Tmax/Tn) relation of < 1.35 is set up.

5. a blast device, is characterized in that, possesses:

Wind path forming member, it has suction port and ejiction opening;

Drive motor; And

Propeller type fan described in any one in Claims 1-4, it is driven by above-mentioned drive motor, is configured in above-mentioned wind path forming member.