The present invention relates to a kind of range hood.
At present, range hood on the market (as European range hood) is because outward appearance need often require the size of casing less, cause its bellows system form single, all be the centrifugal fan system of in square casing, laying mostly, centrifugal blower import and casing air inlet have certain included angle, this angle is generally 90 degree, and as shown in Figure 7, mainly there is the defective of following two aspects in such bellows system:
The first, because casing outside is equipped with cover of upholstery,, can't unpick and wash by the cigarette machine so installing the back impeller, use long afterwards that impeller will gather a large amount of greases, cause the impeller air performance to descend, but also can destroy the dynamic balancing of impeller, cause vibrating noise.
The second, the oil smoke passage winding complex from the casing air inlet to the blower fan inducer, flue gas will certainly produce a large amount of streaming and vortex from the casing air inlet flows to the process of blower fan import, and flow losses are serious, thereby cause noise bigger, and smoke exhaust efficiency is lower.
Chinese patent literature CN200982317Y discloses a kind of top suction type fan in small size on November 28th, 2007, it has spiral case, impeller and motor, spiral case comprises lower house, upper shell and connects the ring-type middle casing of the two, spiral case is provided with air inlet and air outlet, be provided with the air-out passage between air outlet and the spiral case inner chamber, the air inlet place is equipped with air-ducting ring, it is characterized in that: described air-out passage is in the spiralling distorted shape that makes progress simultaneously.It is said, this structure has broken through the size restrictions of length direction in the top suction type worm frame, make that length L can be less than in the 400mm, length dimension than traditional top suction type spiral case reduces 100mm～220mm, and air quantity, blast and noise reach the numerical value of regulation, can solve the problem that small box range hood impeller difficulty is unpicked and washed well, but, its air-out passage is in the spiralling distorted shape that makes progress simultaneously, this structure of actual test shows can cause blower fan outlet flow losses bigger, have a strong impact on smoke exhaust efficiency, but also can increase aerodynamic noise.
Summary of the invention
Purpose of the present invention aims to provide a kind of simple and reasonable, noise is lower, cleaning is convenient and smoke exhaust efficiency is high range hood, to overcome weak point of the prior art.
A kind of range hood by this purpose design, comprise the casing air outlet and the casing air inlet that are arranged on the casing, exhaust fume collecting hood links to each other with the casing air inlet, be provided with fan assembly in the casing, fan assembly comprises impeller, inner core, motor, stator and the diffuser that is arranged in the casing, its architectural feature is that described inner core, diffuser form a circular passage respectively and between the casing, and the position of the corresponding casing air outlet in circular passage is provided with the blower fan outlet; Fans entrance on blower fan outlet and the fan assembly connects mutually, and is coaxial setting.
The motor of described fan assembly is arranged at the leading section of inner core, and the motor shaft of motor stretches in the axis hole of impeller, and cooperation is fixing with it, and this impeller is receded disk impeller or diagonal flow type impeller.
Described fan assembly also comprises the air intake circle, and fans entrance and air intake circle are for being wholely set; The air intake circle is arranged on the air inlet position of impeller, and the air outlet of impeller is provided with the outlet current collector, the tapered or awl arc of outlet current collector.
One end of described outlet current collector is provided with the import mounting flange, and air intake circle and import mounting flange cooperatively interact fixing; The other end of outlet current collector and casing are welded to each other fixing or connect and fix, and this casing is square tube shape or cylindrical shape.
Be provided with stator in the inner chamber of described casing, this stator is circular arc, and itself and inner core interconnect; The position of the corresponding blower fan outlet of casing is provided with the outlet mounting flange, and the casing air outlet on fan assembly and the casing cooperatively interacts fixing by securing member, and the casing air outlet is provided with check-valves; Diffuser is fixedly arranged on the inner core rearward end, the tapered or awl arc of diffuser.
That the present invention has is simple and reasonable, with low cost, it is convenient to clean, smoke exhaust efficiency is high, applied widely and be convenient to the characteristics of processing; The outlet of blower fan on the fan assembly is coaxial setting with fans entrance, when realizing that impeller is convenient to dismounting and is cleaned, can improve smoke exhaust efficiency again and reduce aerodynamic noise, effectively avoids owing to gather a large amount of greases, and causes the decline of impeller air performance; The casing of cylindrical shape or tubular has been simplified the design and the manufacturing in air channel, be convenient to be connected with ventilation shaft on the range hood, compact more with the structure that satisfies fan assembly, saved installing space, and the performance curve of range hood is milder, thereby reduce vibrations, noise and wearing and tearing, its operating efficiency is higher than common multiple wing type centrifugal blower fan.
Description of drawings
Fig. 1 is one embodiment of the invention perspective view.
Fig. 2 is along the sectional structure schematic diagram of A-A direction among Fig. 1.
Fig. 3 is the perspective view of fan assembly.
Fig. 4 is along the sectional structure schematic diagram of B-B direction among Fig. 3.
Fig. 5 is the sectional structure schematic diagram of stator.
Fig. 6 is another embodiment perspective view of fan assembly.
Fig. 7 is a range hood sectional structure schematic diagram in the prior art.
Among the figure: 1 is exhaust fume collecting hood, and 2 is casing, and 21 is the casing air inlet, 22 is the casing air outlet, and 3 is fan assembly, and 31 is the air intake circle, 32 is impeller, and 33 are the outlet current collector, and 34 is casing, 35 is inner core, and 36 is motor, and 37 is stator, 38 is diffuser, and 391 are the import mounting flange, and 392 are the outlet mounting flange, 4 is check-valves, and 5 are the blower fan outlet, and 6 is fans entrance.
The specific embodiment
Below in conjunction with drawings and Examples the present invention is further described.
Referring to Fig. 1-Fig. 5, this range hood comprises the casing air outlet 22 and the casing air inlet 21 that are arranged on the casing 2, and casing air outlet 22 is provided with check-valves 4, and check-valves 4 can play the anti-air-return effect, and exhaust fume collecting hood 1 links to each other with casing air inlet 21.Be provided with fan assembly 3 in the casing 2, fan assembly 3 is assembled by the impeller 32, inner core 35, motor 36, stator 37 and the diffuser 38 that are arranged in the casing 34.The axis direction of motor 36 is consistent with the axis direction of casing 34, and motor 36 is arranged at the leading section of inner core 35, and the motor shaft of motor 36 stretches in the axis hole of impeller 32, and cooperation is fixing with it, and this impeller 32 is a receded disk impeller 32.Diffuser 38 is fixedly arranged on the rearward end of inner core 35.Diffuser 38 is tapered, sees Fig. 4, and the effect of diffuser 38 is to the further diffusion of air-flow, and dynamic pressure partly is converted into static pressure, thereby reduces flow losses.
Form a circular passage between inner core 35, diffuser 38 and the casing 34, the position of the corresponding casing air outlet 22 in circular passage is provided with blower fan outlet 5.Fan assembly 3 also comprises air intake circle 31, fans entrance 6 and air intake circle 31 are for being wholely set, and blower fan outlet 5 connects mutually with fans entrance 6, and is coaxial setting, its purpose is: when being convenient to impeller 32 dismounting cleaning, can improving smoke exhaust efficiency again and reduce aerodynamic noise.The position of casing 34 corresponding blower fan outlets 5 is provided with outlet mounting flange 392, and the casing air outlet 22 on fan assembly 3 and the casing 2 cooperatively interacts fixing by screw.Be provided with stator 37 in the inner chamber of casing 34, this stator 37 is circular arc, sees Fig. 5, and itself and inner core 35 interconnect, and stator 37 is that swirling eddy is carried out water conservancy diversion and diffusion, and air-flow is flowed out along axis direction more efficiently.
Air intake circle 31 is arranged on the air inlet position of impeller 32, and the air outlet of impeller 32 is provided with outlet current collector 33, and outlet current collector 33 is the awl arc, and outlet current collector 33 can change the radial air flow in the air outlet of impeller 32 into axial flow.One end of outlet current collector 33 is provided with import mounting flange 391, and air intake circle 31 cooperatively interacts fixing with import mounting flange 391.The other end and the casing 34 of outlet current collector 33 are welded to each other fixing, this casing 34 is cylindrical, can select according to the shape of casing 2, and its purpose is: make the performance curve of range hood milder, its operating efficiency is higher than common multiple wing type centrifugal blower fan, and noise is lower.
Referring to Fig. 6, impeller 32 is the diagonal flow type impeller, thereby produces higher pressure and flow.The casing 34 of square tube shape is convenient to be connected with ventilation shaft on the range hood, makes installation easier, also makes the structure of fan assembly 3 compact more, has saved installing space.Other does not state part with first embodiment.