CN106568109A - Noise reducing impeller and range hood applying impeller - Google Patents

Abstract

A noise reduction impeller and a range hood using the impeller, the noise reduction impeller has a noise reduction hole on the front blade of the middle plate, and the fan air inlet of the range hood is arranged on the rear side plate of the volute The rear air inlet of the volute is opened on the front side plate of the volute, which is connected with the fan outlet. A noise-reducing cavity communicating with the front air vent is formed below. The noise reduction impeller can reduce the running noise by setting the noise reduction hole on the front blade of the center plate. In addition, the range hood adopts the rear side air intake mode, and after the noise reduction chamber is set on the front side of the fan, it can avoid the front The vent sucks oil fumes from the bottom of the fume collecting hood, eliminates the flow noise caused by the turbulent air flow in the space in front of the fan housing, and at the same time blocks the path of noise propagating outward through the front of the fan housing, and, in the case of large resistance in the public flue , the noise reduction cavity can also play a pressure relief role.

Description

A noise-reducing impeller and a range hood using the impeller

technical field

The invention relates to a range hood, in particular to a noise reduction impeller and a range hood using the impeller.

Background technique

At present, most of the existing European-style range hoods do not have a noise-reducing structure inside the air duct. When the fan rotates, the powerful airflow directly rushes into the air duct, which easily forms eddies or turbulence in the upper space of the air inlet. Make the range hood louder. There are also range hoods that set a partition at the air inlet of the fan, so that the oil fume enters the air inlet of the fan after passing through the partition. The installation of the partition has a certain effect on improving the oil filtering effect, but it is easy to generate additional noise caused by the airflow blowing the partition. In addition, range hoods that can reduce noise have also been disclosed in the prior art, such as the "Rectification and Noise Reduction Type Range Hood" disclosed in the Chinese invention patent No. ZL 2009130429746.6 (authorized announcement number is CN 202350141 U), The rectifying and noise-reducing range hood includes a centrifugal fan and an air duct housing. The centrifugal fan is provided with an air inlet and installed in the air duct housing. A rectifying plate is arranged in the air duct housing between them, and the rectifying plate is located between the upper part of the air inlet of the centrifugal fan and the top plate of the air duct. Due to the function of the rectifying plate, the flue gas cannot form turbulent flow in the space above the air inlet and between the top plate of the air duct, so the turbulent flow noise can be reduced, and the suction efficiency of the range hood can be improved. Although the above-mentioned improved rectification and noise reduction type range hood can reduce noise, the noise reduction effect is not obvious enough. In addition, the existing range hoods also adopt a rear air intake structure. In order to avoid the adverse effect of the motor on the intake air, these range hoods place the motor on the front side of the fan, so it is not convenient for the impeller to move from the front. Side disassembly is also not conducive to the later maintenance of the fan and the cleaning of the volute.

In addition, the air inlet of the top-suction range hood is located on the side of the volute, and usually adopts a single-side air intake, resulting in a small air intake area and a small amount of exhaust fume. In order to overcome the defect of one-side air intake, the existing A range hood with double-side air intake has been disclosed in the technology, such as the "A Range Hood with Air Suction Double Ejection Acceleration" disclosed in the Chinese invention patent No. 201110027636.1 (authorized announcement number is CN 102072515A). 》, the range hood has a chassis and a smoke collection hood. A volute is arranged in the chassis, an impeller and a motor are arranged in the volute, and a front air inlet and a rear air inlet are arranged on the volute. The tuyere has a first oil fume channel, and there is a second oil fume channel from the beginning of the smoke collecting area to the rear air inlet. The diameters of the two oil fume channels gradually become smaller, which is conducive to accelerating the rise of the air flow and accelerating the oil fume being sucked away, thereby improving oil absorption. Effect. However, due to the formation of two oil fume channels, the oil fume enters the fan from the front and rear air inlets, and the noise of the range hood mainly comes from the inside of the centrifugal fan, so the centrifugal fan will go out through the two air inlets during operation. Radiates loud noise.

Contents of the invention

The first technical problem to be solved by the present invention is to provide a noise-reducing impeller with a simple structure and good noise-reducing effect in view of the above-mentioned prior art status.

The second technical problem to be solved by the present invention is to provide a noise-reducing range hood that can take in air at the rear of the fan and form a noise-reducing chamber at the front of the fan.

The technical solution adopted by the present invention to solve the above-mentioned first technical problem is: the noise-reducing impeller includes a central plate and blades installed on the central plate, and the blades include front blades and The rear blade on the rear side of the center plate is characterized in that: a noise reduction hole is opened on the front blade.

In order to obtain a better noise reduction effect, the noise reduction holes are arranged in rows along the length direction of the front blade, and at least three rows of noise reduction holes are distributed on one front blade.

Further preferably, the front blades have a first row of noise reduction holes that are arranged in such a way that the diameter of the noise reduction holes at both ends is the largest, the diameter of the middle noise reduction hole is the smallest, and the diameter of the noise reduction holes gradually decreases from the two ends to the middle. The front blade also has the second row of noise reduction holes with the smallest noise reduction holes at the two ends, the largest noise reduction hole in the middle, and the second noise reduction hole with the diameter of the noise reduction holes gradually decreasing from the middle to the two ends, and the first noise reduction hole The arrangement rows and the second noise reduction hole arrangement rows are alternately distributed.

Further preferably, the diameters of adjacent noise reduction holes in the first row of noise reduction holes and the second row of noise reduction holes are distributed in an arithmetic sequence. In this way, through the regular openings on the blades on the front side of the center plate, the noise reduction holes with different apertures are distributed at different positions, which is beneficial to reduce various frequency noises.

Further preferably, the length of the front blade is shorter than the length of the rear blade.

Further preferably, the front blade and the rear blade are separately provided. Certainly, the impeller blade may also adopt an integrated structure.

The technical solution adopted by the present invention to solve the above-mentioned second technical problem is: the range hood with the above-mentioned noise-reducing impeller includes a fan, a fan cover and a smoke collecting hood arranged under the fan cover, and is characterized in that: The fan includes a volute, a noise-reducing impeller, and a motor that drives the noise-reducing impeller. The volute has a volute rear side plate and a volute front side plate. The air inlet of the fan is located on the volute rear side plate. The rear air inlet on the front side plate of the volute is provided with a front air outlet connected to the fan outlet, the front air inlet and the rear air inlet are blocked from each other by the middle plate of the noise-reducing impeller. In front of the fan or in front of and below the fan is formed a noise reduction cavity communicating with the front vent.

Further preferably, a deflector is provided below the fan, and the noise reduction cavity is formed between the deflector, the volute and the fan housing. After the deflector is installed, the oil fume in the fume collecting hood can be quickly introduced into the fan impeller. The deflector can not only guide the oil fume, but also cooperate with the volute and the fan cover to form a noise reduction cavity, which can also play a role in noise reduction .

The deflector can have a variety of installation structures. Preferably, the deflector is arranged horizontally and obliquely upward from front to rear, the front side of the deflector is fixed on the front cover of the fan housing, and the rear side of the deflector It is fixed on the rear side plate of the volute.

In order to further reduce noise, the noise reduction cavity is filled with sound-absorbing cotton. Of course, other noise reduction materials such as filter orifices can also be arranged in the noise reduction cavity.

Compared with the prior art, the present invention has the advantages that: the noise reduction impeller can reduce the operating noise of the range hood using the noise reduction impeller by setting the noise reduction hole on the front blade of the middle plate; in addition, the oil suction The hood adopts the rear side air intake mode, and after the noise reduction chamber is set on the front side of the fan, it can prevent the front vent from sucking oil fumes from the bottom of the fume collecting hood, eliminate the flow noise of the air flow disorder in the front side space of the fan cover, and at the same time block The noise is transmitted outward through the front side of the fan housing, and, in the case of a large resistance in the public flue, the noise reduction chamber can also play a role of pressure relief, so that the flow noise caused by the air flow back into the noise reduction chamber is eliminated. Blocked in the noise reduction chamber.

Description of drawings

Fig. 1 is the structural representation of the noise-reducing impeller of the embodiment of the present invention;

Fig. 2 is a structural schematic diagram of the blades on the front side of the middle disc of the impeller shown in Fig. 1;

3 is a schematic structural view of a range hood according to an embodiment of the present invention;

Fig. 4 is a sectional view of the range hood shown in Fig. 3;

Fig. 5 is a schematic structural diagram of a fan according to an embodiment of the present invention.

detailed description

The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

As shown in Fig. 1 and Fig. 2, the noise reduction impeller 5 in the present embodiment includes a middle disc 51 and blades installed on the middle disc, wherein the blades include a front vane 52 arranged on the front side of the middle disc and a For the rear blade 53 on the rear side of the center plate, the front blade 52 is shorter and the rear blade 53 is longer. The front blade 52 and the rear blade 53 may adopt an integral structure or a separate structure. Noise reduction holes 54 are opened on the front blade 52 , and the noise reduction holes 54 are arranged in rows along the length direction of the front blade 52 , and at least three rows of noise hole rows are distributed on one front blade 52 .

In this embodiment, five rows of noise reduction holes are arranged on one front blade 52 . The front blade 52 has the first noise reduction hole arrangement row a in which the diameter of the noise reduction hole at both ends is the largest, the diameter of the middle noise reduction hole is the smallest, and the diameter of the noise reduction hole gradually decreases from the two ends to the middle. The second noise-reduction holes are arranged in rows b with the smallest noise-reduction holes at both ends, the largest noise-reduction holes in the middle and the diameter of the noise-reduction holes gradually decreases from the middle to both ends, and the first noise-reduction holes are arranged in row a The rows b and the second noise reduction holes are arranged alternately. In addition, the diameters of adjacent noise reduction holes 54 in the first row a of noise reduction holes and the second row b of noise reduction holes are distributed in an arithmetic sequence. After the noise reduction holes 54 of the front blade 52 adopt the above structure, the noise reduction holes 54 with different apertures are distributed in different positions, which is beneficial to reduce various frequency noises.

As shown in Figures 3 to 5, the noise reduction range hood in this embodiment includes a fan 1, a fan cover 2 and a smoke collection hood 3, the fan 1 is arranged inside the fan cover 2, and the smoke collection hood 3 is arranged under the fan cover 2 . The fan 1 includes a volute 4 , a noise reduction impeller 5 and a motor 6 for driving the noise reduction impeller 5 , the volute has a volute rear side plate 41 and a volute front side plate 42 . Taking the direction indicated by the arrow A in Figure 4 as the rear direction, a rear air inlet 11 is provided on the rear side plate 41 of the volute, a front air inlet 12 is provided on the front side plate 42 of the volute, and the rear air inlet 11 and the front air outlet 12 The middle plate 51 of the noise-reducing impeller 5 blocks each other, and both the rear air inlet 11 and the front air outlet 12 communicate with the fan outlet 13 . A collector ring 9 is installed on the rear air inlet 11 and the front air inlet 12, and a guide cone 10 is installed on the collector ring 9 of the rear air inlet 11, and the diameter of the guide cone 10 gradually increases along the air inlet direction , and the center of the diversion cone 10 coincides with the center of the collector ring 9 , that is, the diversion cone 10 is located at the center of the collector ring 9 .

The motor 6 is located at the rear side of the noise reduction impeller 5 and faces the diversion cone 10. The motor 6 is fixed on the back of the diversion cone 10, and the outer diameter of the motor 6 is less than or equal to the diameter of the largest end of the diversion cone 10. In this embodiment Among them, the diameter of the largest end of the diversion cone 10 is 80 mm to 100 mm. In this way, the guide cone 10 can completely cover the motor 6, thereby avoiding the influence of the motor 6 on the way of the rear air intake. It can be seen that the diversion cone 10 not only plays the role of diversion and noise reduction, reducing the noise at the collector ring 9, but also can be used to fix the motor 6 of the fan. Moreover, after the motor 6 is placed on the rear side of the fan 1, the noise reduction impeller 5 can be easily disassembled from the front side, thereby making the post-maintenance of the fan 1 and cleaning of the volute more convenient.

A deflector 8 is arranged below the blower fan 1, and the deflector 8 is arranged horizontally and obliquely upwards from the front to the rear. The sides are fixed on the rear side plate 41 of the volute. After the deflector 8 is set, the oil fume in the smoke collecting hood 3 can be quickly introduced into the noise reduction impeller 5, that is, the deflector 8 plays the role of guiding the oil fume, reducing the resistance of the pipe network and improving the air performance.

In addition, the deflector 8, the volute 4 and the fan housing 2 form a noise reduction cavity 7 connected with the front air vent 12, and noise reduction materials such as sound-absorbing cotton and filter orifice plates can be installed in the noise reduction cavity 7. Further improve the noise reduction effect. When the range hood is working, the airflow is sucked into the rear side of the noise reduction impeller 5 from the rear air inlet 11 of the fan. Since the rear air inlet 11 and the front air outlet 12 are mutually blocked, the airflow can only flow out from the fan outlet 13, and, in public When the flue has a large resistance, the air flow at the air outlet 13 of the fan can flow back to the front side of the noise reduction impeller 5 , and then flow back into the noise reduction chamber 7 through the front vent 12 . It can be seen that after the noise reduction chamber 7 is provided, not only can the front vent 12 be prevented from inhaling oil fume from the bottom of the smoke collecting hood 3, but also the flow noise of the air flow disorder in the space in front of the fan housing 2 can be eliminated, and the noise can be blocked from passing through the front of the fan housing 2. The path of lateral outward propagation, and in the case of large resistance in the public flue, it can also play a role of pressure relief, reducing the impact noise of airflow resistance resistance. According to experiments, the range hood in this embodiment can reduce fan noise by 2-4db compared with the existing forward wind or left and right air intake.

The above descriptions are only preferred embodiments of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, various modifications or improvements can be made to the present invention, and these are all regarded as within the protection scope of the present invention.

Claims (10)

1. A noise reduction impeller (5), comprising a middle disc (51) and a blade installed on the middle disc, the blades include a front blade (52) located at the front side of the middle disc and a rear blade located at the middle disc The rear blade (53) on the side is characterized in that: a noise reduction hole (54) is opened on the front blade (52). 2. The noise reduction impeller according to claim 1, characterized in that: the noise reduction holes (54) are arranged in rows along the length direction of the front blades (52), and one of the front blades (52) ) are distributed with at least three rows of noise reduction holes. 3. The noise-reducing impeller according to claim 2, characterized in that: the front blades (52) are arranged so that the noise-reducing holes at both ends have the largest aperture, the middle noise-reducing hole has the smallest aperture, and the noise-reducing holes have an aperture of from The first noise reduction holes are arranged in rows (a) that gradually decrease from both ends to the middle, and the front blade (52) also has the smallest aperture of the noise reduction holes at the two ends, the largest aperture of the middle noise reduction hole, and the largest diameter of the noise reduction hole. The second row of noise reduction holes (b) whose hole diameter gradually decreases from the middle to both ends, and the first row of noise reduction holes (a) and the second row of noise reduction holes (b) are alternately distributed. 4. The noise reduction impeller according to claim 3, characterized in that: the diameters of the adjacent noise reduction holes in the first row of noise reduction holes (a) and the second row of noise reduction holes (b) are the same. Arithmetic distribution. 5. The noise reduction impeller according to claim 4, characterized in that: the length of the front blade (52) is smaller than the length of the rear blade (53). 6. The noise reducing impeller according to any one of claims 1 to 5, characterized in that the front blade (52) and the rear blade (53) are arranged separately. 7. A range hood that uses the noise reduction impeller as claimed in any one of claims 1 to 6, comprising a fan (1), a fan cover (2) and a smoke collection hood (3) located below the fan cover , is characterized in that: the fan (1) includes a volute (4), a noise reduction impeller (5) and a motor (6) driving the noise reduction impeller, and the volute (4) has a volute rear side plate ( 41) and the front side plate of the volute (42), the air inlet of the fan (1) is the rear air inlet (11) located on the rear side plate of the volute (41), and the front side plate of the volute (42) is provided with a front vent (12) connected to the fan outlet (13), the front vent (12) and the rear air inlet (11) pass through the middle plate of the noise reduction impeller (5) (51) are mutually blocked, and a noise reduction cavity (7) communicated with the front air vent (12) is formed in front of the fan (1) or in front and below the fan. 8. The range hood according to claim 7, characterized in that: a deflector (8) is provided under the fan (1), and the deflector (8), volute (4) and The noise reduction chamber (7) is enclosed between the fan housings (2). 9. The range hood according to claim 8, characterized in that: the deflector (8) is arranged horizontally and obliquely upward from front to rear, and the front side of the deflector (8) is fixed on the fan housing (2) On the front cover plate (21), the rear side of the deflector (8) is fixed on the described volute rear side plate (41). 10. The range hood according to claim 7, characterized in that: the noise reduction cavity (7) is filled with sound-absorbing cotton.