CN216079942U - Flow guide device and range hood applying same - Google Patents

Abstract

The utility model relates to a flow guide device which is arranged on the inner wall of a flow channel and comprises a first flow guide plate, wherein the first end of the first flow guide plate is connected to the inner wall of the flow channel in a limiting manner; the first end of the second guide plate is in rotating butt joint with the second end of the first guide plate, and the second end can be movably limited on the inner wall of the flow channel; and the driving mechanism is in transmission connection with the second end of the second guide plate and is used for driving the second end of the second guide plate to be close to or far away from the first end of the first guide plate, so that the volume of the enclosed cavity between the first guide plate, the second guide plate and the inner wall of the air duct is changed. The flow guide device can guide air flow in the air duct, can absorb noise adaptively according to noise frequency difference caused by different rotating speeds of the fan in the air duct, and can prevent oil drops from dropping. The range hood using the flow guide device has low noise and better application experience.

Description

Flow guide device and range hood applying same

Technical Field

The utility model relates to a flow guide device applied to a range hood system, and also relates to a range hood applying the flow guide device.

Background

The range hood works by utilizing the fluid dynamics principle, sucks and exhausts oil smoke through a centrifugal fan arranged in the range hood, and filters partial grease particles by using a filter screen. The centrifugal fan comprises a volute, an impeller arranged in the volute and a motor driving the impeller to rotate. When the impeller rotates, negative pressure suction is generated in the center of the fan, oil smoke below the range hood is sucked into the fan, accelerated by the fan and then collected and guided by the volute to be discharged out of a room.

Along with the popularization of the application of the range hood, people have higher and higher requirements on the range hood, such as the dripping problem and the noise problem of oil stains, which are the problems commonly existing in the existing range hood.

In the existing range hood, a guide plate is usually arranged at a smoke inlet to guide the flow direction of the oil smoke and balance the air speed entering an air duct. If the chinese utility model patent with the publication number of CN206504373U "a top suction guide plate type range hood", the guide plate disclosed therein is disposed in the oil collecting cavity, and the rear portion of the guide plate is inclined and extended into the oil cup in order to solve the oil dripping and leaking situation of the oil stain on the guide plate. But the baffle of this kind of structure can't solve the noise problem, and simultaneously, the anterior greasy dirt of baffle still has the possibility of drippage in below operation platform.

As for the noise problem, the sound absorption box is fixed in front of or behind the fan, but the sound absorption box occupies the front space of the fan, which may cause the flow deterioration.

SUMMERY OF THE UTILITY MODEL

The technical problem to be solved by the utility model is to provide a flow guide device aiming at the prior art, which can guide the air flow in the air duct, absorb noise adaptively according to the noise frequency difference caused by different rotating speeds of a fan in the air duct, and prevent oil drops from dropping.

The technical problem to be solved by the utility model is to provide a range hood with the flow guide device, which is low in noise and better in application experience.

The technical scheme adopted by the utility model for solving the first technical problem is as follows: a flow guiding device is arranged on the inner wall of a flow passage, and is characterized in that: comprises that

The first end of the first guide plate is connected to the inner wall of the flow channel in a limiting and rotating manner;

the first end of the second guide plate is in rotating butt joint with the second end of the first guide plate, and the second end can be movably limited on the inner wall of the flow channel;

and the driving mechanism is in transmission connection with the second end of the second guide plate and is used for driving the second end of the second guide plate to be close to or far away from the first end of the first guide plate, so that the volume of the enclosed cavity between the first guide plate, the second guide plate and the inner wall of the air duct is changed.

A plurality of small holes are formed in the first guide plate and the second guide plate.

Preferably, the first guide plate and the second guide plate are distributed along the extending direction of the flow channel.

Preferably, the first baffle is pivotally connected to an upstream end of the second baffle.

The structure is simple, and the first guide plate and the second guide plate are hinged through the connecting pin.

In order to better guide the second guide plate to move, guide parts are respectively arranged on the inner wall of the flow channel corresponding to the two sides of the second guide plate, and the second guide plate is limited on the guide parts.

Simple structure ground, the guide part is for setting up the guide way on the runner inner wall, and actuating mechanism corresponds one of them guide way setting, actuating mechanism includes the motor, sets up lead screw and the cover in the guide way and establishes the guide block on the lead screw, the drive end at the motor is connected to the lead screw, one side of second guide plate second end is passed through the spliced pole and is connected on the guide block, the opposite side of second guide plate second end is spacing in the guide way that corresponds through spacing post.

The technical scheme adopted by the utility model for solving the second technical problem is as follows: the utility model provides a range hood, includes collection petticoat pipe, connects fan cover, the fan system of setting in the fan cover top in collection petticoat pipe top, its characterized in that: the fan cover is characterized by further comprising two flow guiding devices, the two flow guiding devices are arranged on two opposite side walls of a flow channel in the fan cover respectively, the front side edges and the rear side edges of the first flow guiding plates and the second flow guiding plates are correspondingly attached to the front wall surface and the rear wall surface of the flow channel, and the flow guiding devices are located below the fan system.

In order to realize making an uproar, make the installation back better pleasing to the eye simultaneously, the top in fan guard fixed mounting space, the collection petticoat pipe is close to the top of a kitchen range setting, be formed with the oil smoke runner of direction oil smoke between fan guard and the collection petticoat pipe.

Optionally, the lower end of the fan cover extends downwards to be abutted with the smoke collecting cover to form the smoke flow channel, or a smoke guide body with the smoke flow channel is connected between the fan cover and the smoke collecting cover.

Compared with the prior art, the utility model has the advantages that: according to the flow guide device, the first flow guide plate and the second flow guide plate are relatively close to each other during operation, and further form a space with the wall of the flow channel in an enclosing mode, so that the flow guide device not only can realize the flow guide effect on gas in the air channel, but also can reduce noise propagation and play a noise reduction effect. And aiming at the difference of noise frequency caused by different motor rotating speeds under the same air volume, the first guide plate, the second guide plate and the cavity formed by the inner wall of the flow channel have two changes, namely, the second guide plate can form different cavity volumes to the different moving distances of the first guide plate corresponding to the same flow guide angle of the first guide plate, so that the noise with different frequencies is absorbed, and the effective noise reduction of the noise with different frequencies under the same application environment is met. In addition, the small hole structures on the first guide plate and the second guide plate can further realize noise reduction.

When the oil cup is in a non-working state, the first guide plate and the second guide plate can be relatively unfolded and tightly attached to the inner wall of the flow channel, oil drops above the oil cup can flow downwards into the oil cup, the oil hanging phenomenon of the first guide plate and the second guide plate is reduced, and oil stains are prevented from directly dropping below to pollute the cooking bench.

Drawings

Fig. 1 is a perspective view of a range hood in an embodiment of the present invention.

Fig. 2 is an installation diagram of a flow guide device in an oil smoke flow passage in the embodiment of the utility model.

Fig. 3 is a diagram illustrating an operation state of the air guiding device according to the embodiment of the present invention.

Fig. 4 is a diagram illustrating a non-operating state of the air guiding device according to the embodiment of the present invention.

Fig. 5 is a comparison diagram of the operation state of the air guiding device in the embodiment of the utility model.

Detailed Description

The utility model is described in further detail below with reference to the accompanying examples.

Directional terms such as "front," "rear," "upper," "lower," "left," "right," "side," "top," "bottom," and the like are used in the description and claims of the present invention to describe various example structural portions and elements of the utility model, but are used herein for convenience of description only and are to be determined based on the example orientations shown in the drawings. Because the disclosed embodiments of the present invention may be oriented in different directions, the directional terms are used for descriptive purposes and are not to be construed as limiting, e.g., "upper" and "lower" are not necessarily limited to directions opposite to or coincident with the direction of gravity.

The flow guide device in the embodiment can be applied to various range hoods to play the roles of oil smoke flow guide and noise reduction of the range hoods. In the present embodiment, a range hood with a long air duct is taken as an example, and the flow guide device and the range hood with the long air duct using the flow guide device are described in detail at the same time.

As shown in fig. 1, the range hood includes a fume collecting hood 5, a fan hood 6 connected above the fume collecting hood 5, a fan system disposed in the top of the fan hood 6, and a flow guide device.

In order to reduce the noise of the range hood during operation, the range hood adopts a long air duct, namely, a fan cover 6 is fixedly arranged at the top of a mounting space, a smoke collecting cover 5 is arranged close to a cooking bench, and an oil smoke flow channel 7 which extends up and down and is used for guiding oil smoke is formed between the fan cover 6 and the smoke collecting cover 5.

The upper part of the fan guard 6 in this embodiment has a horizontal cavity distributed horizontally and capable of accommodating a fan system, which is usually installed in the ceiling of a kitchen space, while the lower part of the fan guard 6 extends below the ceiling and the lower part of the fan guard 6 is flat in the direction close to the wall. The lower extreme of fan cover 6 continues downwardly extending and dock with collection petticoat pipe 5 and form aforementioned oil smoke runner 7, perhaps is connected with the smoke guide body 8 that has oil smoke runner 7 between fan cover 6 and the collection petticoat pipe 5, and in order to make things convenient for the transportation and the transport of part, in this embodiment, be connected with smoke guide body 8 between fan cover 6 and collection petticoat pipe 5, should lead the setting of cigarette 8 platykurtic and paste and establish on the wall, so can promote the spatial sensation in culinary art region, promote user's impression.

The fan system is arranged above the suspended ceiling, so that the noise source principle of the range hood is realized by the ears of a user, and a certain noise reduction effect is realized. On this basis, the guiding device in this embodiment also can further play the noise reduction effect, reduces the noise that descends from the fan system.

The two flow guiding devices in the embodiment are respectively arranged on the left side wall and the right side wall of the inner flow channel of the fan cover 6, and the flow guiding devices are positioned below the fan system.

As shown in fig. 2 to 5, the flow guiding device includes a first flow guiding plate 1, a second flow guiding plate 2, and a driving mechanism. The first guide plate 1 and the second guide plate 2 are hinged through a connecting pin 3, and the first guide plate 1 and the second guide plate 2 are distributed along the extending direction of the flow channel. Specifically, the first guide plate 1 is rotatably connected to the upstream end of the second guide plate 2, and since the oil smoke flows from bottom to top, the lower part is the upstream of the oil smoke flow passage 7, the first guide plate 1 is disposed below the second guide plate 2 in this embodiment. The preceding side and the back side of first guide plate 1 and second guide plate 2 correspond the laminating on the preceding wall and the back wall of runner, so when first guide plate 1 and second guide plate 2 fold, form the cavity between the inner wall of first guide plate 1, second guide plate 2 and oil smoke runner 7, through the volume size who changes the cavity, and then the performance is to the effect of making an uproar that falls of noise of not using the frequency.

A plurality of apertures 100 have all been seted up on first guide plate 1 and the second guide plate 2, can further realize the effect of making an uproar through aperture 100.

The specific installation structure of the deflector is as follows. First guide plate 1 first end rotates limitedly and connects on the runner inner wall, and in this embodiment, both sides extend respectively around the first end of first guide plate 1 and are provided with the pivot, so first end of first guide plate 1 rotates through the pivot to be connected on the preceding lateral wall and the back side wall of oil smoke runner 7.

The second end of the second guide plate 2 can be movably limited in the flow channel wall, specifically, guide portions are respectively arranged on the inner wall of the oil smoke flow channel 7 corresponding to the front side and the rear side of the second guide plate 2, the guide portions are guide grooves 4 arranged on the inner wall of the flow channel, and the extending wind direction of the guide grooves 4 is the extending direction of the oil smoke flow channel 7, that is, the guide grooves 4 extend along the up-and-down direction. The second guide plate 2 is limited in the guide groove 4.

The driving mechanism is arranged corresponding to one of the guide grooves 4, and the driving mechanism is in transmission connection with the second end of the second guide plate 2 corresponding to the position where the guide groove 4 is arranged. The driving mechanism comprises a motor 9, a screw rod arranged in a guide groove 4 and a guide block sleeved on the screw rod, the screw rod is connected at the driving end of the motor 9, one side of the second end of the second guide plate 2 is connected to the guide block through a connecting column, and the other side of the second end of the second guide plate 2 is limited in the corresponding guide groove 4 through a limiting column. The driving mechanism can drive the lead screw to rotate, the guide block is driven to move back and forth along the direction of the guide groove 4 along with the rotation of the lead screw, and the second end of the corresponding second guide plate 2 is driven to be close to or far away from the first end of the first guide plate 1, so that the volume of the cavity surrounded between the first guide plate 1, the second guide plate 2 and the inner wall of the air duct is changed.

When the range hood works, the distance of the second guide plate 2 moving towards the first guide plate 1 is correspondingly adjusted according to the rotating speed of the fan, so that an included angle is formed between the first guide plate 1 and the plane of the side wall of the oil smoke flow channel 7, and the volume of the cavity surrounded between the first guide plate 1 and the air channel inner wall and between the second guide plate 2 and the air channel inner wall is changed. Particularly, when the included angle between the first guide plate 1 and the plane of the side wall of the lampblack flow channel 7 is determined, as shown in a comparison diagram of fig. 5, the volumes of the enclosed cavities between the first guide plate 1 and the second guide plate 2 and the inner wall of the air duct may be different, so that the targeted noise reduction processing is conveniently performed on the noises with different frequencies.

At the time of cooking, the more starting users in the same public flue, the more oil smoke in the public flue, the higher the pressure, and the larger the pressure, the lower the air volume of the range hood, at the moment, the rotating speed of the motor 9 can be increased to increase the air volume of the range hood to do work on the oil smoke discharge, and the reduced air volume is recovered. Therefore, the same air volume realized by the range hood can correspond to different rotating speeds under different use working conditions.

The discrete noise generated by the fan is caused by the periodic air beating of the impeller, the noise frequency of the range hood is related to the fan rotating speed, and the relationship between the fan rotating speed N and the blade frequency f1 is as follows: and f1 is N/60K, wherein K is the number of blades on the impeller, and f1 is the most dominant noise frequency of the range hood.

Different fan rotating speeds, namely different noise frequencies f1, can be caused under the same air volume due to different back pressures of the common flue, and the volume of the enclosed cavity among the first guide plate 1, the second guide plate 2 and the inner wall of the air flue is changed by adjusting the angle between the first guide plate 1 and the second guide plate 2, so that the cavity absorbs the noise frequency

Where c is the speed of sound, s is the area of the cavity opening, V is the volume of the cavity, and lK is the effective depth of the opening, when f is close to f1, the cavity will absorb the noise propagating downwards from the fan more effectively.

The control process of the range hood is as follows: the range hood is started, the fan rotating speed N and the P-Q-N curve (static pressure-air volume-rotating speed curve) at the moment are read, the required included angle between the first guide plate 1 and the second guide plate 2 is calculated according to the air volume data, the air volume is reduced, the included angle between the first guide plate 1 and the second guide plate 2 is increased, the passing cross sectional area is reduced, the oil smoke flow rate is increased, and the oil smoke can enter the fan at an accelerated speed. The amount of wind increase, the contained angle between first guide plate 1 and the second guide plate 2 reduces, and the oil smoke velocity of flow is very fast this moment, reduces its impact to falling the guiding device of making an uproar, prevents to produce abnormal sound increase noise.

Different fan rotational speeds that are possible to same amount of wind produce, divide into high frequency noise and low frequency noise with it, change and surround the cavity and correspond its noise of absorption between first guide plate 1, second guide plate 2 and the wind channel inner wall, under the unchangeable condition of first guide plate 1 and 7 contained angles of oil smoke runner, during low frequency noise, compare in when high frequency noise, the second end of second guide plate 2 is more close to the first end of first guide plate 1. The different volumes of the cavities for noise reduction under the same flow guide angle are realized, and then the noise with different frequencies is absorbed.

After the range hood is used, the second end of the second guide plate 2 is driven by the driving mechanism to be far away from the first end of the second guide plate 2, so that the first guide plate 1 and the second guide plate 2 are opened to be in a planar state and attached to the inner wall of the oil smoke flow channel 7, the inner wall of the oil smoke flow channel 7 and the first guide plate 1 are convenient, oil stains on the second guide plate 2 flow to an oil cup of the range hood along the inner wall of the oil smoke flow channel 7, the oil stains on the first guide plate 1 and the second guide plate 2 are prevented from falling on a cooking bench below, and the cleaning of the cooking bench is guaranteed.

According to the flow guide device, the first flow guide plate 1 and the second flow guide plate 2 are relatively close to each other during operation, and further form a space with the wall of the flow channel in an enclosing mode, so that the flow guide device not only can achieve the flow guide effect on gas in the air channel, but also can reduce noise propagation and play a noise reduction effect. And aiming at the noise frequency difference caused by different fan rotating speeds under the same air quantity, the cavities formed by the first guide plate 1, the second guide plate 2 and the inner wall of the flow channel have two changes, namely, different cavity volumes can be formed by the second guide plate 2 towards different moving distances of the first guide plate 1 corresponding to the same flow guide angle of the first guide plate 1, so that different frequency noises are absorbed, and the effective noise reduction of different frequency noises under the same application environment is met. In addition, the small holes 100 on the first guide plate 1 and the second guide plate 2 can further reduce noise.

And when being in non-operating condition, first guide plate 1 and second guide plate 2 can expand relatively and paste the runner inner wall, are favorable to the top oil to drip downwards and flow into the oil cup, reduce the oily phenomenon of hanging of first guide plate 1, second guide plate 2, prevent that the greasy dirt from directly dripping the below and polluting the top of a kitchen range, have promoted user experience.

Claims (10)

1. A flow guiding device is arranged on the inner wall of a flow passage, and is characterized in that: comprises that

The first end of the first guide plate (1) is connected to the inner wall of the flow channel in a limiting and rotating manner;

the first end of the second guide plate (2) is in rotating butt joint with the second end of the first guide plate (1), and the second end can be movably limited in the flow channel wall;

and the driving mechanism is in transmission connection with the second end of the second guide plate (2) and is used for driving the second end of the second guide plate (2) to be close to or far away from the first end of the first guide plate (1), so that the volume of the enclosed cavity between the first guide plate (1), the second guide plate (2) and the inner wall of the air duct is changed.

2. The flow directing device of claim 1, wherein: a plurality of small holes (100) are formed in the first guide plate (1) and the second guide plate (2).

3. The flow directing device of claim 1, wherein: the first guide plate (1) and the second guide plate (2) are distributed along the extending direction of the flow channel.

4. The flow directing device of claim 3, wherein: the first guide plate (1) is rotatably connected to the upstream end of the second guide plate (2).

5. Deflector device according to any of claims 1 to 4, wherein: the first guide plate (1) and the second guide plate (2) are hinged through a connecting pin (3).

6. Deflector device according to any of claims 1 to 4, wherein: the inner wall of the flow channel is provided with guide parts corresponding to two sides of the second guide plate (2), and the second guide plate (2) is limited in the guide parts.

7. The flow directing device of claim 6, wherein: the guiding part is for setting up guide way (4) on the runner inner wall, and actuating mechanism sets up corresponding to one of them guide way (4), actuating mechanism includes motor (9), sets up lead screw and the cover in guide way (4) and establishes the guide block on the lead screw, the drive end at motor (9) is connected to the lead screw, the spliced pole is passed through to one side of second guide plate (2) second end and is connected on the guide block, the opposite side of second guide plate (2) second end is spacing in guide way (4) that correspond through spacing post.

8. The utility model provides a range hood, includes collection petticoat pipe (5), connects fan guard (6) in collection petticoat pipe (5) top, sets up the fan system in fan guard (6) top, its characterized in that: the air guide device of any one of claims 1 to 7, wherein the air guide device is provided with two air guide plates which are respectively arranged on two opposite side walls of a flow channel in the fan cover (6), the front side edges and the rear side edges of the first air guide plate (1) and the second air guide plate (2) are correspondingly attached to the front wall surface and the rear wall surface of the flow channel, and the air guide device is positioned below the fan system.

9. The range hood of claim 8, wherein: the kitchen range is characterized in that the top of the space is fixedly installed on the fan cover (6), the smoke collecting hood (5) is arranged close to a kitchen range, and an oil smoke flow channel (7) for guiding oil smoke is formed between the fan cover (6) and the smoke collecting hood (5).

10. The range hood of claim 8, wherein: the lower end of the fan cover (6) extends downwards and is connected with the smoke collecting cover (5) in a butt joint mode to form the oil smoke flow channel (7), or a smoke guide body (8) with the oil smoke flow channel (7) is connected between the fan cover (6) and the smoke collecting cover (5).

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