CN106524263A - Range hood - Google Patents

Abstract

The invention discloses a range hood which comprises a smoke collecting cover, a fan cover and a centrifugal fan arranged in the fan cover. The centrifugal fan is provided with an air inlet facing downwards and comprises an outer volute and an impeller. The outer volute comprises an outer volute annular wall, a front volute cover located at the bottom, and a rear volute cover located at the top. An opening is formed in the rear volute cover so as to serve as an air outlet of the centrifugal fan. The impeller comprises a plurality of blades. The range hood is characterized in that an annular-wall-shaped inner volute is arranged above the impeller, and a runner is formed between the inner volute and the outer volute annular wall. Through arrangement of the inner volute, lampblack gas is gradually distributed to the outlet side while lampblack flows around the impeller, friction losses of the impeller can be reduced, and meanwhile, leakage losses in the fan system can be reduced.

Description

A kind of range hood

Technical field

The present invention relates to a kind of cooking apparatus, especially a kind of range hood.

Background technology

Range hood has become one of indispensable machine for kitchen use equipment in Modern Family.Range hood is in use state Under air draft flow depend primarily on the blast of cooking-fume exhauster blower system, blast is bigger, and air draft flow is also bigger.Normal domestic use Range hood when in use, oil smoke needs to discharge oil smoke by drag devices such as smoke exhaust pipe, check (non-return) valve and discharge flues, this The presence of a little drag devices so that oil smoke has certain back pressure at oil smoke outlet, and the presence of back pressure can largely effect on oil The air draft flow of cigarette machine.The blast of blower fan system has a positive effect to the air draft flow of range hood, and the presence of back pressure is then to inhaling The air draft flow of lampblack absorber plays negative influence.

Generally range hood includes top suction type and side-suction type, and the range hood of top suction type is empty due to clean and tidy light and handy, occupancy Between it is little the advantages of, it is and in an increasingly wide range of applications.Top-sucking kitchen ventilator generally includes exhaust fume collecting hood, on exhaust fume collecting hood Blower housing, is provided with spiral case, impeller and drives the motor of impeller in blower housing.

The range hood of conventional top suction type, it is a kind of as disclosed in the Chinese patent of Application No. 201410704669.9 to inhale Lampblack absorber, including the exhaust fume collecting hood with inlet scoop, is arranged on the wind cabinet on exhaust fume collecting hood top, is arranged on the wind with spiral case in wind cabinet Machine, by the effect of blower fan, forms negative pressure so as to outside oil smoke is sucked in wind cabinet while the gas in wind cabinet is discharged, Realize the purpose of fume-exhausting.

Existing range hood is due to installation dimension and the restriction with cabinet dimensional fits so as to the suction inlet of blower fan system Or it is vertical with kitchen range plane or in larger angle, it is difficult to suction inlet is realized just to lower section, when oil smoke enters range hood, As path is longer, cause loss excessive, when oil smoke amount is excessive, be also easy to the phenomenon for fumes escaping occur.

The content of the invention

The technical problem to be solved is the problem existed for above-mentioned prior art, there is provided a kind of to reduce blast Loss, the cylindrical range hood for lifting smoke absorption effect.

The present invention solve the technical scheme that adopted of above-mentioned technical problem for：A kind of range hood, including exhaust fume collecting hood, blower fan Cover, and the centrifugal blower that is placed in fan shroud, the centrifugal blower have air inlet directed downwardly, and the centrifugal blower includes outer Spiral case and impeller, the outer spiral casing include outer spiral casing ring wall, the spiral case protecgulum positioned at bottom and the spiral case bonnet positioned at top, institute State the upper shed of spiral case bonnet and form the air outlet of centrifugal blower, the impeller includes multiple blades, it is characterised in that：The leaf Wheel top is provided with the inner spiral casing of ring wall shape, forms runner between the inner spiral casing and outer spiral casing ring wall.

Preferably, the molded line of the inner spiral casing includes interior spiral pieces.

Preferably, it is the efficiency that improves inner spiral casing, the interior spiral pieces are obtained by equation below：

Wherein, initial angles of the θ 0 for inner spiral casing, C2m are component of the impeller outlet speed in axial direction, and C2u is impeller outlet speed The component in circumferencial direction is spent, R2 is impeller outer diameter；R0 is outer spiral casing ring wall diameter；Corresponding interior helical when R is arbitrarily angled θ Section radius；B0 is width of blade plus the anterior diastema between spiral case protecgulum, and B is inner spiral casing width.

To realize directly inhaling in line, the outlet of the outer spiral casing ring wall and inner spiral casing and the air outlet pair of the centrifugal blower Should, air-out mask is provided with above the air outlet.

To avoid oil vapor backstreaming, connecting plate is provided between the outer spiral casing ring wall and the outlet of inner spiral casing, so as to close The outlet of outer spiral casing ring wall and inner spiral casing radial direction.

In order that the oil smoke inside fan shroud is not easy accumulation, it is easy to oil smoke to be preferably flowed in lubricating cup, the wind Hood is in cylinder.

For ease of oil smoke air-flow is directed to centrifugal blower from exhaust fume collecting hood, on the air inlet and exhaust fume collecting hood of the centrifugal blower The ring-type conducting element for tapering into from the bottom to top is provided between the air inlet for opening up.

For ease of to filtering oil smoke and rectification, being provided with filter screen below the air inlet of the centrifugal blower, in conducting element.

Compared with prior art, it is an advantage of the current invention that：By arranging inner spiral casing so that oil smoke is around impeller flowing Soot gas are gradually assigned to outlet side simultaneously, wheel friction loss can be reduced, while can reduce in blower fan system The leakage loss in portion；Realize and directly inhale in line smoke absorption effect, can be with the oil suction smoke performance of significant increase lampblack absorber；Fan shroud Column type is presented, internal oil smoke is not easy accumulation, is easy to oil smoke to be preferably flowed in lubricating cup.

Description of the drawings

Fig. 1 is the schematic diagram of the range hood of the present invention；

Fig. 2 is the sectional view of the range hood of the present invention；

Fig. 3 is the partial schematic diagram of the range hood of the present invention；

Fig. 4 is the partial schematic diagram of the range hood of the present invention；

Decomposition texture schematic diagrams of the Fig. 5 for Fig. 3；

Fig. 6 is the sectional view of the centrifugal blower of the range hood of the present invention；

Fig. 7 is the top view (hiding spiral case bonnet) of the range hood of the present invention.

Specific embodiment

The present invention is described in further detail below in conjunction with accompanying drawing embodiment.

Referring to Fig. 1～Fig. 5, a kind of range hood, including exhaust fume collecting hood 1, fan shroud 2 and centrifugal blower 4, during fan shroud 2 is in Hollow-cylindrical, centrifugal blower 4 are placed in fan shroud 2, and blower hood 3 is then placed in 2 periphery of fan shroud.The air-out of centrifugal blower 4 Air-out mask 6 is provided with mouthful.The bottom rear of exhaust fume collecting hood 1 is provided with lubricating cup 7.As the profile of fan shroud 2 is presented column type, Without corner angle, therefore the oil smoke of inside is not easy accumulation, is easy to oil smoke to be preferably flowed in lubricating cup, and range hood pattern is new Grain husk, modern science and technology sense are strong, with larger market value.

The bottom rear of exhaust fume collecting hood 1 is provided with lubricating cup 5, offers air inlet 11 on exhaust fume collecting hood 1, centrifugal blower 4 be it is horizontal, Its air inlet 41 down, is provided between the air inlet 11 of the air inlet 41 and exhaust fume collecting hood 1 of centrifugal blower 4 and gradually becomes from the bottom to top Little ring-type conducting element 5, to guide oil smoke air-flow to enter in centrifugal blower 4 from exhaust fume collecting hood 1.Under the air inlet 41 of centrifugal blower 4 Filter screen 12 is provided with side, conducting element 5.Oil smoke is produced from immediately below range hood and with certain speed ascension upwards, oil suction Cigarette machine suction inlet (air inlet 41 of air inlet 11, centrifugal blower 41 on exhaust fume collecting hood 1) is directly just to oil smoke so that oil smoke without Cross any to turn round just be inhaled in range hood.Oil smoke is once filtered by filter screen 12, while filter screen 12 can be with Rectification is carried out to fume-exhausting, improves the inflow condition of centrifugal blower 4, oil smoke is entered in centrifugal blower 4, carries out secondary filter and energy Amount is lifted.Oil smoke from centrifugal blower 4 out, is discharged by air-out mask 6.Thus achieve and directly inhale in line fume-exhausting effect Really, can be with the oil suction smoke performance of significant increase lampblack absorber.

Centrifugal blower 4 includes outer spiral casing 42, impeller 43, inner spiral casing 44 and the motor 45 for driving impeller 43, impeller 43 Including multiple blades 431, outer spiral casing 42 includes outer spiral casing ring wall 421, the spiral case protecgulum 422 positioned at bottom, positioned at the snail at top Shell bonnet 423.Offer opening to form the air inlet 41 of above-mentioned centrifugal blower 4, spiral case bonnet 423 on spiral case protecgulum 422 On offer and be open to form the air outlet 48 of centrifugal blower 4, air-out mask 6 is corresponding with air outlet 48.

Wheel disc 46 is provided with impeller 43, motor 45 is arranged on the top of impeller 43, and the output shaft connection of motor 45 To wheel disc 46, so that motor 45 can drive impeller 43 to rotate.Motor 45 is solid with spiral case bonnet 423 by electric machine support 451 It is fixed.When above-mentioned 4 structure of this centrifugal blower, the direct mode directed downwardly of air inlet of employing, therefore impeller 43 rotate, due to inertia Effect, in entrance meeting one effect of prewhirling of self-assembling formation, when the oil smoke impulse force for rising is not very strong, it can be seen that oil smoke The state that volume is inhaled can be presented so that suction oil smoke is presented the form of tornado, further enhances the effect of gathering of oil smoke, strengthens The effect of fume-exhausting.

Inner spiral casing 44 is the ring wall similar with outer spiral casing ring wall 421, is arranged on the top of impeller 43, and is located at outer spiral casing On the inside of ring wall 421, the outside of motor 45.The outlet of inner spiral casing 44 is corresponding with the exit position of outer spiral casing 42, and inner spiral casing 44 Connecting plate 47 is provided between the two ends in exit, between the two ends in 42 exit of outer spiral casing, by inner spiral casing 44 and outer spiral casing 42 Outlet diametrically close, prevent oil smoke airflow reflux.The flow path of oil smoke air-flow is substantially presented such as the arrow institute in Fig. 2 Show, air-flow through impeller 43 from radially flowing out, the then stream between along on the inside of outer spiral casing ring wall 421 and on the inside of inner spiral casing 44 Road 49 is gradually arranged to outlet, and due to the suction mouth down of impeller 43, therefore air-flow is in outer spiral casing 42 and the exit of inner spiral casing 44 Gradually turned to by radial direction and axially discharged.

The molded line of outer spiral casing ring wall 421 can adopt prior art, be formed between inner spiral casing 44 and outer spiral casing ring wall 421 Flow area is designed by the swirl distribution of air stream outlet, after the molded line of outer spiral casing ring wall 421 determines, by from leaf The air-flow circular rector of 43 outlet of wheel, just can determine the molded line of inner spiral casing 44.Outer spiral casing 42 and inner spiral casing 44 reclaim the dynamic of impeller 43 Can, static energy is translated into, according to Bernoulli equation, kinetic energy is reclaimed and enlargement in section, speed is reduced, thus Static energy can be converted kinetic energy into.And the principle of inner spiral casing 44 is just so that oil smoke is surrounded soot gas while impeller flows Outlet side is gradually assigned to, wheel friction loss can be reduced, while the leakage loss inside centrifugal blower 4 can be reduced. The molded line of inner spiral casing 44 is obtained based on the constant Design Theory of circular rector, including the interior spiral pieces 442 extended by snail tongue 441.

Referring to Fig. 6 and Fig. 7, the determination mode of the interior spiral pieces 442 of 44 molded line of inner spiral casing is：

Wherein, initial angles of the θ 0 for inner spiral casing 44, C2m are component of 43 muzzle velocity of impeller in axial direction, can be according to wind Amount and the number of blade are calculated, and C2u is component of 43 muzzle velocity of impeller in circumferencial direction, can be according to blade angle, rotating speed, wind Amount is calculated；R2 is 43 external diameter of impeller；R0 is 421 diameter of outer spiral casing ring wall；Corresponding interior spiral pieces 442 half when R is arbitrarily angled θ Footpath；B0 is 431 width of blade plus the anterior diastema between spiral case protecgulum 422；B is 44 width of inner spiral casing.

Claims (8)

1. a kind of range hood, including exhaust fume collecting hood (1), fan shroud (2), and the centrifugal blower (4) that is placed in fan shroud (2), The centrifugal blower (4) includes outer spiral casing (42) and impeller (43) with air inlet directed downwardly (41), the centrifugal blower (4), The outer spiral casing (42) is including outer spiral casing ring wall (421), positioned at the spiral case protecgulum (422) and the spiral case bonnet positioned at top of bottom (423), spiral case bonnet (423) upper shed and form the air outlet (48) of centrifugal blower (4), the impeller (43) is including more Individual blade (431), it is characterised in that：The inner spiral casing (44) of ring wall shape, the inner spiral casing are provided with above the impeller (43) (44) formation runner (49) and outer spiral casing ring wall (421) between.

2. range hood as claimed in claim 1, it is characterised in that：The molded line of the inner spiral casing (44) includes interior spiral pieces (442)。

3. range hood as claimed in claim 2, it is characterised in that：The interior spiral pieces (442) are obtained by equation below：

$\mathrm{\θ}0=Y\frac{C2u}{C2m}Y|\left(\frac{B0+B}{B}\right)ln\left(\frac{R0}{R2}\right)$

$ln\left(\frac{R}{R2}\right)=\mathrm{\θ}\left|\frac{C2u}{C2m}\right|\frac{B0}{B}$

Wherein, initial angles of the θ 0 for inner spiral casing (44), C2m are component of impeller (43) muzzle velocity in axial direction, and C2u is impeller (43) component of the muzzle velocity in circumferencial direction, R2 are impeller (43) external diameter；R0 is outer spiral casing ring wall (421) diameter；R is any Corresponding interior spiral pieces (442) radius during angle, θ；B0 is blade (431) width plus between front between spiral case protecgulum (422) Gap, B are inner spiral casing (44) width.

4. range hood as claimed in claim 1, it is characterised in that：The outer spiral casing ring wall (421) and inner spiral casing (44) Outlet is corresponding with the air outlet (48) of the centrifugal blower (4), is provided with air-out mask (6) above the air outlet (48).

5. range hood as claimed in claim 4, it is characterised in that：The outer spiral casing ring wall (421) and inner spiral casing (44) Connecting plate (47) is provided between outlet, so as to close the outlet of outer spiral casing ring wall (421) and inner spiral casing (44) radial direction.

6. the range hood as any one of Claims 1 to 5, it is characterised in that：The fan shroud (2) is in cylinder.

7. the range hood as any one of Claims 1 to 5, it is characterised in that：The air inlet of the centrifugal blower (4) (41) the ring-type conducting element (5) for tapering into from the bottom to top is provided between the air inlet (11) for and on exhaust fume collecting hood (1) opening up.

8. range hood as claimed in claim 7, it is characterised in that：Below the air inlet of the centrifugal blower (4), conducting element (5) filter screen (12) is provided with.