CN101092975A

CN101092975A - Spiral case of blower fan in apparatus with inlet air from two sides for sucking oil fume

Info

Publication number: CN101092975A
Application number: CN 200710069947
Authority: CN
Inventors: 茅忠群
Original assignee: Ningbo Fotile Kitchen Ware Co Ltd
Current assignee: Ningbo Fotile Kitchen Ware Co Ltd
Priority date: 2007-07-06
Filing date: 2007-07-06
Publication date: 2007-12-26
Anticipated expiration: 2027-07-06
Also published as: CN101092975B

Abstract

This invention discloses a fan turbine casing inletting wind from two sides including a front cover plate, a back cover plate and a circular middle shell connecting the two, a front air-inlet and a back air-inlet are set on them separately, and the projection of the center of the front one on the plane where the back cover places is coincident with that of the back one characterizing that a curved panel projecting downward is connected between the down edges of the two plates to shield the middle shell, so smoke can be led to the front and back air-inlets smoothly.

Description

A kind of double-faced ventilated cooking-fume exhauster blower volute

Technical field

The present invention relates to the component structural of range hood, particularly to the improvement of the volute of blower of double-faced ventilated range hood.

Background technique

Range hood is one of requisite machine for kitchen use equipment of family.At present, European-style range hood is subjected to increasing Consumer's favor because of having clean and tidy light and handy, the advantage such as little that takes up room of outward appearance.European-style range hood generally comprises exhaust fume collecting hood, is positioned at blower fan body (inlet box) also perpendicular on the exhaust fume collecting hood, the motor that the blower fan body is equipped with volute of blower, impeller and drives impeller, wherein volute of blower comprises front shroud, back shroud and is connected the two ring-type middle casing, the middle casing part except that snail tongue place usually is all vertical with front shroud, back shroud, have intake grill on the front shroud, back shroud is provided with motor, and impeller is promptly between forward and backward cover plate.And the difference of European-style range hood and traditional kitchen ventilator maximum is: intake grill is positioned at the side of volute of blower, it is the single side face air intake, its incoming air area is less, the cooking-fume discharging amount is not very desirable, therefore, some can be invented by double-faced ventilated volute of blower, as the patent No. is the Chinese utility model patent " two air-inlet range hood " of ZL200420082377.8, the patent No. is that the Chinese utility model patent " blower volute structure of the European range hood that a kind of energy is double-faced ventilated " of CN200620103331.9 and the Chinese utility model patent that the patent No. is CN200620103332.3 " blower volute structure of European range hood that can be double-faced ventilated " just provide a kind of like this scheme, it is preceding, all have intake grill on the back shroud, oil smoke promptly on the intake grill from the front shroud and the back shroud gap between motor and the intake grill enter volute of blower.But the forward and backward cover plate of existing these spiral cases is all perpendicular to middle casing, that is to say, middle casing and forward and backward cover plate joint are the right angle transition, thus, the most oil smoke that enter kitchen ventilator directly strike on the middle casing from Vertical direction at first substantially, and then flow toward the intake grill place of both sides, thereby cause the air-flow on this bulk zone very disorderly, consequently: noise is bigger on the one hand, is that windage is big, wind loss is big on the other hand.In addition, above-mentioned patent has also been carried out optimal design to the radius of curvature at upper shell, lower shell body, ring-type middle casing and snail tongue place based on the design concept of active noise reduction.Based on same design concept, in the deficiency on overcoming existing worm frame, also need each radius of curvature is redesigned.

Summary of the invention

Technical problem to be solved by this invention is a kind of improved double-faced ventilated cooking-fume exhauster blower volute of exploitation, can enter blower fan more smoothly in the hope of oil smoke, reduces noise, reduces windage and reduce wind loss.

Another technical problem to be solved by this invention is double-faced ventilated cooking-fume exhauster blower volute to be carried out on the above-mentioned improved basis, each radius of curvature is given optimal design, with further reduction noise, reduce windage and reduce wind loss, obtain better air performance.

The present invention solves the problems of the technologies described above the technological scheme that is adopted: the cooking-fume exhauster blower volute that this is double-faced ventilated, have front shroud, back shroud and be connected the two ring-type middle casing, have preceding intake opening, back intake opening on front shroud, the back shroud, and the projection of the center of circle of preceding intake opening on plane, back shroud place overlaps with the center of circle of back intake opening, it is characterized in that being connected with the curved plate of downward protrusion between the lower limb of the lower limb of described front shroud and back shroud, and therefore covered described middle casing.From being convenient to process and help the smooth and easy flowing angle consideration of oil smoke, described curved plate is preferably with described front shroud, back shroud and is integral part.

Because the mobile of oil smoke is to flow from bottom to top earlier, run into behind the curved plate promptly under the guide function of curved plate and to flow to forward and backward intake grill from both sides, as long as, be two straight lines that intersect etc. as cylindrical shape and cross section so the shape of curved plate can play shunting and guide function and avoid turbulent appearance as far as possible.Obviously, described curved plate preferably is cylindrical shape, and the bus of this cylinder is and all parallel horizontal line section in plane, described front shroud place and plane, back shroud place.Because curved plate is earlier to its shunting to the guided procedure of oil smoke, forward and backward intake grill then leads respectively, so the further preferable shape of curved plate is: described curved plate is seen from its cross section and is divided into three sections, the i.e. straightway IJ of the straightway GH of Zhong Jian arc section HI, rear side and front side, and middle arc section HI position is minimum.Test through reality, take all factors into consideration the air performance and the noise level of spiral case, the decision design of this curved plate is: the angle of described straightway GH and described back shroud is 135 °, and the angle of described straightway IJ and described front shroud is 168 °, and the radius of curvature of described arc section HJ is preferably 50mm.

For realizing the better air performance under the spiral case small size, can do following further optimal design to spiral case:

Described middle casing is a dissymmetrical structure at snail tongue place, and the middle casing at this place is connected described front shroud, back shroud with the warp surface of continuously smooth transition, and,

The edge contour of 1. described middle casing front side is by straight line AB, curve B C, circular arc C D and the straight line DE of rounding off are formed by connecting successively, and, straight line AB and curve B C are tangential on a B, and curve B C and circular arc C D are cut in a C outward, and circular arc C D and straight line DE are tangential on a D; Wherein, curve B C slips over the curve that crosses formed spline curve or obtained by this spline curve scaled down or amplification by 30 null circles in the following form:

Angle	Radius mm	Angle	Radius mm	Angle	Radius mm	Angle	Radius mm	Angle	Radius mm
Angle	Radius mm	Angle	Radius mm	Angle	Radius mm	Angle	Radius mm	Angle	Radius mm	-6°	-140.336	0°	140.575	10°	141.174	20°	142.046	30°	143.132
40°	144.756	50°	146.797	60°	148.662	70°	150.293	80°	151.635	-6°	-140.336	0°	140.575	10°	141.174	20°	142.046	30°	143.132
40°	144.756	50°	146.797	60°	148.662	70°	150.293	80°	151.635	90°	152.639	100°	154.283	110°	156.304	120°	158.662	130°	161.298
140°	164.141	150°	167.111	160°	170.120	170°	173.063	180°	175.869	90°	152.639	100°	154.283	110°	156.304	120°	158.662	130°	161.298
140°	164.141	150°	167.111	160°	170.120	170°	173.063	180°	175.869	190°	179.221	200°	183.206	210°	187.332	220°	191.442	230°	195.404
240°	199.179	250°	202.335	260°	205.050	270°	207.120	281°	208.544	190°	179.221	200°	183.206	210°	187.332	220°	191.442	230°	195.404

30 centers of circle that the pairing true origin of point is described preceding intake opening in the above table;

The edge contour of 2. described middle casing rear side is by straight line A ' B ', curve B ' C ', circular arc C ' D ' and the straight line D ' E ' of rounding off are formed by connecting successively, and, straight line A ' B ' and curve B ' C ' are tangential on a B ', curve B ' C ' and circular arc C ' D ' are cut in a C ' outward, and circular arc C ' D ' and straight line D ' E ' are tangential on a D '; Wherein, curve B ' C ' slips over the curve that crosses formed spline curve or obtained by this spline curve scaled down or amplification by 31 null circles in the following form:

Angle	Radius mm	Angle	Radius mm	Angle	Radius mm	Angle	Radius mm	Angle	Radius mm
Angle	Radius mm	Angle	Radius mm	Angle	Radius mm	Angle	Radius mm	Angle	Radius mm	-15°	136.000	-10°	135.827	0°	136.398	10°	137.773	20°	139.391
30°	141.185	40°	143.115	50°	145.125	60°	147.155	70°	149.144	-15°	136.000	-10°	135.827	0°	136.398	10°	137.773	20°	139.391
30°	141.185	40°	143.115	50°	145.125	60°	147.155	70°	149.144	80°	151.026	90°	152.699	100°	154.279	110°	156.303	120°	158.663
130°	161.298	140°	164.141	150°	167.111	160°	170.120	170°	173.063	80°	151.026	90°	152.699	100°	154.279	110°	156.303	120°	158.663
130°	161.298	140°	164.141	150°	167.111	160°	170.120	170°	173.063	180°	175.869	190°	179.221	200°	183.206	210°	187.332	220°	191.442
230°	195.404	240°	199.079	250°	202.335	260°	205.050	270°	207.120	180°	175.869	190°	179.221	200°	183.206	210°	187.332	220°	191.442
230°	195.404	240°	199.079	250°	202.335	260°	205.050	270°	207.120	281°	208.554

31 centers of circle that the pairing true origin of point is a described back intake opening in the above table;

Some A on the edge contour of 3. described middle casing front side, B, C, D, E respectively with the edge contour of described middle casing rear side on A ', B ', C ', D ', E ' corresponding one by one.

For obtaining good active noise reduction effect, described middle casing is preferably 8: 18 at the ratio of the radius R 1 of the forward edge profile circular arc C D of snail tongue place correspondence and the radius R 2 of posterior edges profile circular arc C ' D '.

Compared with prior art, the invention has the advantages that:

1, because set up curved plate, can so both effectively reduced noise, reduce windage again effectively very swimmingly by its forward and backward intake grill that leads, reduce the wind loss of blower fan, improve the air performance of spiral case so enter the oil smoke of kitchen ventilator; 2, the spiral case middle casing is carried out optimal design, realized air performance better under the spiral case small size, and noise has had obvious reduction.Prove that through comparative trial repeatedly the design can control the separation of air-flow in the spiral case process of flowing through effectively, air-flow is little along the loss of journey static pressure, has guaranteed that blower fan reaches higher efficient; 3, both keep the double-faced ventilated advantage in front and back, also had the advantage that volume is little, air quantity is big, blast is high, noise is low, and can satisfy the good requirement of combination property that Chinese kitchen environment heavy wool is greasy, Gao Zhiyan proposes range hood preferably.

Description of drawings

Fig. 1 is the schematic perspective view of embodiment of the invention spiral case;

Fig. 2 is the plan view of spiral case shown in Figure 1;

Fig. 3 is the A-A sectional view of spiral case shown in Figure 2;

Fig. 4 is the A-A three-dimensional cutaway view of spiral case shown in Figure 2;

Fig. 5 is the B-B sectional view of spiral case shown in Figure 3;

Fig. 6 is the B-B three-dimensional cutaway view of spiral case shown in Figure 3;

Fig. 7 is the projection sketch of edge wheel profile of the middle casing front side of embodiment of the invention spiral case;

Fig. 8 is the projection sketch of edge wheel profile of the middle casing rear side of embodiment of the invention spiral case;

Fig. 9 is the cross-sectional of back shroud, curved plate and front shroud;

Figure 10 is for installing the stereogram behind motor and the impeller in the spiral case shown in Figure 1;

Figure 11 is the stereogram (filter screen and lubricating cup state are not installed) that the double-air intake cooking fume machine of embodiment of the invention spiral case is installed.

Embodiment

Embodiment describes in further detail the present invention below in conjunction with accompanying drawing.

As Fig. 1～illustrated in Figure 9, be a preferred embodiment of the present invention.As Fig. 1～shown in Figure 9, the cooking-fume exhauster blower volute that present embodiment is double-faced ventilated, the ring-type middle casing 3 that it has front shroud 1, back shroud 2 and is connected the two, except that snail tongue place, middle casing 3 and front shroud 1, back shroud 2 are all vertical, intake opening 4, back intake opening 5 before having on front shroud 1, the back shroud 2, and the projection of the center of circle of preceding intake opening 4 on plane, back shroud 2 place overlaps with the center of circle of back intake opening 5.Be connected with the curved plate 6 of the cylindrical shape of downward protrusion between the lower limb of the lower limb of front shroud 1 and back shroud 2, and this curved plate 6 be integral piece with front shroud 1, back shroud 2, and so and covered middle casing 3.

Referring to Fig. 4, Fig. 5, Figure 10, the minimum point place of middle casing 3 offers oil dripping hole 7, has corresponding oil leaking hole 8 on the curved plate 6, so that draw drawing oil pipe 9 and can pass from this oil leaking hole 8 from oil dripping hole 7.

Referring to Fig. 4, the curved plate 6 of cylindrical shape, the bus of its cylinder are and all parallel horizontal line section in front shroud plane, 1 place and plane, back shroud 2 place.

Referring to Fig. 9 as seen, curved plate 6 sees from its cross section and is divided into three sections, i.e. the straightway IJ of the straightway GH of Zhong Jian arc section HI, rear side and front side, and middle arc section HI position is minimum.And in the present embodiment, the angle α of straightway GH and back shroud is 135 °, and the angle β of straightway IJ and front shroud is 168 °, and the radius of curvature R of arc section HI is 50mm.

Referring to Fig. 4, Fig. 6, described middle casing 3 is a dissymmetrical structure at snail tongue 10 places, and the middle casing 3 at this place is connected described front shroud 1, back shroud 2 with the warp surface of continuously smooth transition.

And, referring to Fig. 7, Fig. 8 as seen:

The edge contour of described middle casing front side is formed by connecting by straight line AB, curve B C, circular arc C D and the straight line DE of rounding off successively, and straight line AB and curve B C are tangential on a B, and curve B C and circular arc C D are cut in a C outward, and circular arc C D and straight line DE are tangential on a D; Wherein, curve B C is slipped over by 30 null circles in the table 1 to cross formed spline curve.

The edge contour of described middle casing rear side is by straight line A ' B ', curve B ' C ', circular arc C ' D ' and the straight line D ' E ' of rounding off are formed by connecting successively, and, straight line A ' B ' and curve B ' C ' are tangential on a B ', curve B ' C ' and circular arc C ' D ' are cut in a C ' outward, and circular arc C ' D ' and straight line D ' E ' are tangential on a D '; Wherein, curve B ' C ' is slipped over by 31 null circles in the table 2 to cross formed spline curve.

Table 1

30 centers of circle that the pairing true origin of point is described preceding intake opening in the table 1;

Table 2

31 centers of circle that the pairing true origin of point is a described back intake opening in the table 2;

And, the some A on the edge contour of described middle casing front side, B, C, D, E respectively with the edge contour of described middle casing rear side on A ', B ', C ', D ', E ' corresponding one by one.In the present embodiment, middle casing is 8: 18 at the ratio of the radius R 1 of the forward edge profile circular arc C D of snail tongue place correspondence and the radius R 2 of posterior edges profile circular arc C ' D '.

Referring to Figure 10 as can be known, back intake opening 5 places of spiral case are installed with motor frame 11, and the motor 12 of kitchen ventilator promptly is installed on this motor frame 11, and impeller 13 is installed in the spiral case.Referring to Figure 11 as seen, the present embodiment spiral case is under user mode, its curved plate 6 is positioned at the below, and oil smoke promptly divides under the guiding of curved plate 6 after rising in kitchen ventilator below and flows to the spiral case both sides, and and then intake grill 4, rear air inlet 5 enter spiral case and discharge outdoor in the past.

Claims

1, a kind of double-faced ventilated cooking-fume exhauster blower volute, have front shroud, back shroud and be connected the two ring-type middle casing, have preceding intake opening, back intake opening on front shroud, the back shroud, and the projection of the center of circle of preceding intake opening on plane, back shroud place overlaps with the center of circle of back intake opening, it is characterized in that being connected with the curved plate of downward protrusion between the lower limb of the lower limb of described front shroud and back shroud, and therefore covered described middle casing.

2, volute of blower according to claim 1 is characterized in that described curved plate and described front shroud, back shroud are integral piece.

3, volute of blower according to claim 2 is characterized in that described curved plate is cylindrical shape, and the bus of this cylinder is and all parallel horizontal line section in plane, described front shroud place and plane, back shroud place.

4, volute of blower according to claim 3 is characterized in that described curved plate is seen from its cross section and is divided into three sections, i.e. the straightway IJ of the straightway GH of Zhong Jian arc section HI, rear side and front side, and middle arc section HI position is minimum.

5, volute of blower according to claim 4, the angle that it is characterized in that described straightway GH and described back shroud is 135 °, the angle of described straightway IJ and described front shroud is 168 °.

6, volute of blower according to claim 4, the radius of curvature that it is characterized in that described arc section HI is 50mm.

7, according to the described volute of blower of arbitrary claim in the claim 1 to 6, it is characterized in that described middle casing is a dissymmetrical structure at snail tongue place, the middle casing at this place is connected described front shroud, back shroud with the warp surface of continuously smooth transition, and,

Angle Radius mm Angle Radius mm Angle Radius mm Angle Radius mm Angle Radius mm -6° -140.336 0° 140.575 10° 141.174 20° 142.046 30° 143.132 40° 144.756 50° 146.797 60° 148.662 70° 150.293 80° 151.635 90° 152.639 100° 154.283 110° 156.304 120° 158.662 130° 161.298 140° 164.141 150° 167.111 160° 170.120 170° 173.063 180° 175.869 190° 179.221 200° 183.206 210° 187.332 220° 191.442 230° 195.404 240° 199.179 250° 202.335 260° 205.050 270° 207.120 281° 208.544

Angle Radius mm Angle Radius mm Angle Radius mm Angle Radius mm Angle Radius mm -15° 136.000 -10° 135.827 0° 136.398 10° 137.773 20° 139.391 30° 141.185 40° 143.115 50° 145.125 60° 147.155 70° 149.144 80° 151.026 90° 152.699 100° 154.279 110° 156.303 120° 158.663 130° 161.298 140° 164.141 150° 167.111 160° 170.120 170° 173.063 180° 175.869 190° 179.221 200° 183.206 210° 187.332 220° 191.442 230° 195.404 240° 199.079 250° 202.335 260° 205.050 270° 207.120 281° 208.554

8, volute of blower according to claim 5 is characterized in that the radius R of described middle casing at the forward edge profile circular arc C D of snail tongue place correspondence ₁Radius R with posterior edges profile circular arc C ' D ' ₂Ratio be 8: 18.