CN109595630B

CN109595630B - Fume exhauster

Info

Publication number: CN109595630B
Application number: CN201710923592.8A
Authority: CN
Inventors: 刘戈; 梁雪斐; 刘逸; 周佳杰; 茅忠群; 诸永定
Original assignee: Ningbo Fotile Kitchen Ware Co Ltd
Current assignee: Ningbo Fotile Kitchen Ware Co Ltd
Priority date: 2017-09-30
Filing date: 2017-09-30
Publication date: 2024-02-20
Anticipated expiration: 2037-09-30
Also published as: CN109595630A

Abstract

The invention discloses a range hood, which comprises a fume collecting hood, a machine case arranged above the fume collecting hood and a fan arranged in the machine case, wherein an air inlet is formed in the fume collecting hood, a smoke guide plate is arranged below the air inlet, the fan is a ternary fan, and at least one part of the lower surface of the smoke guide plate gradually inclines upwards from the middle to the edge, so that an accelerating flow passage with the cross section gradually reduced from bottom to top is defined by being matched with the corresponding wall surface of the fume collecting hood. The amount of the oil smoke entering the range hood in unit time can be increased through the acceleration flow channel, the oil smoke absorbing effect is improved, the oil smoke passes through the rotary filter screen at the inlet of the horizontal three-way fan and the air channel at a lower flow speed before being accelerated by the air channel, the oil smoke and the rotary filter screen are in contact with each other for a longer time, and the oil smoke and the rotary filter screen can be fully collided.

Description

Fume exhauster

Technical Field

The invention relates to kitchen appliances, in particular to a range hood.

Background

The range hood has become one of the indispensable kitchen appliances in modern families. The conventional range hood comprises a top suction type range hood and a near suction type range hood, wherein the top suction type range hood utilizes the principle of rising hot air to suck and discharge the naturally rising oil smoke generated during cooking, and has wider and wider application due to the advantages of neatness, light weight, small occupied space and the like.

The conventional range hood is provided with a filter screen for collecting oil smoke, smoke dust and the like generated during cooking. A smoke exhaust ventilator as disclosed in chinese patent application No. 200780027956.9, comprising a hood having an air duct, an exhaust fan disposed in the air duct, a filter screen disposed in the air duct and in front of the exhaust fan, a driving part connected to the filter screen, and a flat rectifying plate disposed near an air suction port in the hood; as another example, the chinese patent application No. 201620110299.0 discloses a flat-plate smoke exhaust ventilator, which comprises a smoke collecting cavity, an air duct arranged above the smoke collecting cavity, a fan arranged in the air duct, and a smoke filtering device, wherein the smoke filtering device comprises a filter screen disc coaxially installed with the fan, and the filter screen disc comprises a support frame connected with a rotating shaft of the fan and a filter screen fixed on the support frame.

According to the range hood, the rotary filter screen is arranged, so that the oil smoke can be efficiently purified, filtered and decomposed. However, in the top-draft type range hood, the arrangement of the fans cannot realize direct-draft and direct-exhaust of the oil smoke air flow, so that wind resistance is increased, and smoking efficiency is reduced. In addition, the rectifying plate of setting in the air intake department of range hood is the planarization form, can't play drainage, the effect of accelerating to the oil smoke, is difficult to effectively promote the oil smoke effect, and rectifying plate relative position is fixed moreover, and the negative pressure district can not be adjusted according to the in service behavior of top of a kitchen range.

In another example, a rotary net purifying device of a smoke exhaust ventilator is disclosed in chinese patent application No. 98202073.2, a rotary frame is fixed on a motor shaft of a fan port of the smoke exhaust ventilator, a purse net is welded around the rotary frame, a rotary net is fixed on the inner sides of the rotary frame and the purse net by using a snap ring, a fan wheel, the rotary frame, the rotary net and the purse net are driven to rotate by a motor, and the rotary net separates slag, oil and gas from the smoke. The smoke extractor can realize direct suction and direct discharge, however, similar to the vertical or inclined fans, the rotary filter screen can only be arranged at the air inlet of the centrifugal fan and driven to rotate by the motor of the centrifugal fan or an independent motor, so that not only can larger wind resistance be caused, but also the rotary filter screen can play a certain rectifying role on the smoke and then enter the centrifugal fan, the path is too short, and the smooth effect of the air flow cannot be reflected to the greatest extent by the rotary filter screen.

Disclosure of Invention

The invention aims to solve the technical problems of the prior art and provides a range hood capable of improving the oil fume suction efficiency and the oil and fat separation effect.

The technical scheme adopted for solving the technical problems is as follows: the utility model provides a range hood, includes collection petticoat pipe, sets up the quick-witted case and the fan of setting in quick-witted incasement of collection petticoat pipe top, set up the air intake on the collection petticoat pipe, be located the air intake below and be provided with the smoke guide plate, its characterized in that: the fan is a ternary fan, and at least one part of the lower surface of the smoke guide plate gradually inclines upwards from the middle to the edge, so that the lower surface of the smoke guide plate is matched with the corresponding wall surface of the smoke collecting hood to define an accelerating flow passage with the cross section gradually reduced from bottom to top.

Preferably, for effectively accelerating the lampblack around the smoke guide plate, the lower surface of the smoke guide plate comprises at least one of a first inclined plane, a second inclined plane and a third inclined plane, the first inclined plane is inclined upwards from the middle to the left side and forms a first accelerating flow channel with the left side plate of the smoke collecting hood, the second inclined plane is inclined upwards from the middle to the right side and forms a second accelerating flow channel with the right side plate of the smoke collecting hood, and the third inclined plane is inclined from the middle to the front side and forms a third accelerating flow channel with the front side plate of the smoke collecting hood.

Preferably, in order to further enhance the acceleration effect of the acceleration flow path, the inner surfaces of the left side plate, the right side plate and the front side plate are inclined surfaces which are gradually inclined inwards from bottom to top.

Further, in order to facilitate the installation of the smoke guide plate, four corners of the upper surface of the smoke guide plate are respectively provided with a connecting column, and the connecting columns are connected to the outer edge of the air inlet of the smoke collecting hood, so that the smoke guide plate is connected with the smoke collecting hood.

Preferably, for filtering, the rotary filter screen comprises a net disk for filtering oil fume and a motor for driving the net disk to rotate, an output shaft of the motor is inserted into the center of the net disk to be fixedly connected, and the motor is fixedly connected with the case through a motor bracket.

In order to improve the rigidity of the net disk and the filtering effect as much as possible, arc-shaped grooves which are symmetrical along the center and are arranged in an array are formed in the surface of the net disk, each groove extends along the radial direction of the net disk, and at least two layers of grooves are distributed along the radial direction of the net disk.

In order to enable the smoke guide plate to be capable of adjusting the height according to the size of the oil smoke so as to better improve the oil smoke suction effect, the smoke guide plate can be lifted to the highest position to close the air inlet when the range hood is closed, the oil smoke backflow of a public flue is avoided, and the connecting column is a telescopic rod driven by a motor.

In order to enable the oil fume to pass through the rotary filter screen at the minimum flow rate, the two are in contact with each other for a long time, so that a good filtering effect is achieved, and the air duct is in a shape gradually shrinking from bottom to top.

In order to facilitate forming the air duct and reduce noise of the fan, the case comprises four side walls, at least one side wall is provided with a silencing device which gradually inclines towards the corresponding side wall from top to bottom, and the air duct is located on the inner side of the silencing device away from the corresponding side wall.

In order to ensure that the oil smoke passes through the rotary filter screen at a low flow rate so as to be sufficiently filtered, and meanwhile, the rotary filter screen is prevented from exceeding the maximum limit of a negative pressure area of the fan, the fan is horizontally arranged and positioned at the top of the case, the fan comprises a ternary impeller, and the distance between the center of the fan and the rotary filter screen is 1.5-2 times of the diameter of the ternary impeller.

Compared with the prior art, the invention has the advantages that: the smoke guide plate with the inclined lower surface and the smoke collecting cover form an oil smoke accelerating flow channel together, so that the amount of oil smoke entering the range hood in unit time can be increased, the oil smoke absorbing effect is improved, the horizontal three-way fan is arranged, the rotary filter screen is arranged at the air duct inlet in the case, the oil smoke can pass through the rotary filter screen at a lower flow rate before being accelerated by the air duct, the time of mutual contact between the two is longer, the oil smoke and the rotary filter screen can be fully collided, meanwhile, the passing oil smoke has a rectifying effect, and the rectification is completed by the longer air duct, so that a better filtering effect is achieved; the interval between fan and the rotary filter screen is controlled, so that oil smoke is ensured to smoothly enter the fan, and the rotary filter screen is prevented from exceeding the maximum limit of the negative pressure area of the fan.

Drawings

Fig. 1 is a schematic view of a range hood according to the present invention;

fig. 2 is a front cross-sectional view of the range hood of the present invention;

fig. 3 is a side sectional view of the range hood of the present invention;

fig. 4 is a schematic view of a hidden front side wall of a cabinet of the range hood according to the present invention;

fig. 5 is a schematic view of a smoke guide plate of the range hood according to the present invention;

fig. 6 is a schematic view of a rotary screen of the range hood of the present invention.

Detailed Description

The invention is described in further detail below with reference to the embodiments of the drawings.

Referring to fig. 1 to 4, a range hood comprises a fume collecting hood 1 and a case 2 arranged above the fume collecting hood 1, wherein a fan 4 is arranged in the case 2. The fume collecting hood 1 is provided with an air inlet 11, so that the fan 4 in the case 2 can suck fume, enter the case 2 through the air inlet 11 and then be discharged to a public flue.

The chassis 2 includes a left side wall 21, a right side wall 22, a front side wall 23, and a rear side wall 24. The left side wall 21 is provided with a first muffler device 31 which gradually inclines from top to bottom to the left side wall 21, the right side wall 22 is provided with a second muffler device 32 which gradually inclines from top to bottom to the right side wall 22, the front side wall 23 is provided with a third muffler device 33 which gradually inclines from top to bottom to the front side wall 23, and the rear side wall 24 is provided with a fourth muffler device 34 which gradually inclines from top to bottom to the rear side wall 24. The four silencing devices are located below the fan 4, and cavities among the silencing devices form an air duct 25 of the lampblack airflow, namely the air duct 25 is located on the inner side, away from the corresponding side wall, of the silencing devices. The above-mentioned silencing devices can adopt the structure of combining common pore plate with sound-absorbing cotton. The number of the muffler devices may be other than four, or may not be all inclined, so long as the air duct 25 is gradually reduced from bottom to top.

In this embodiment, the fan 4 is a three-way fan, and the three-way fan may be a three-way fan according to the prior art, as disclosed in chinese patent No. 201310418009. The fan 4 is arranged horizontally, that is, the air inlet 44 of the fan 4 faces downwards, and the fan 4 is arranged at the top in the case 2 and above the air duct 25. The blower 4 includes a three-way impeller 41, a volute 42 provided outside the three-way impeller 41, and a motor 43 for driving the three-way impeller 41 to rotate. An air outlet cover 7 connected with an air outlet of the fan 4 is arranged above the case 2, so that the oil smoke can be discharged into a public flue through the air outlet cover 7.

An upwardly concave smoke collecting cavity 12 is formed in the smoke collecting cover 1, an air inlet 11 is positioned at the top of the smoke collecting cavity 12, a smoke guide plate 8 is arranged in the smoke collecting cavity 12 and at a position opposite to the air inlet 11, and condensation and filtration treatment is carried out on the smoke before the smoke enters the smoke exhauster through the smoke guide plate 8, so that the first smoke separation is carried out. With reference to fig. 5, the shape and size of the smoke-guiding plate 8 substantially coincides with the cross-section of the smoke-collecting chamber 12.

At least a portion of the lower surface of the smoke guide plate 8 is inclined gradually upwards from the middle to the edge, thereby defining an accelerating flow path with a gradually decreasing cross section from bottom to top in cooperation with the corresponding wall surface of the smoke collecting hood 1. When the oil smoke flows from bottom to top to contact with the lower surface of the smoke guide plate 8, the oil smoke is guided to split in the horizontal direction by utilizing the coanda effect, then guided into the acceleration flow channel from the edge of the smoke guide plate 8, flows upwards into a cavity formed between the upper surface of the smoke guide plate 8 and the smoke collecting cover 1, and finally enters the chassis 2 through the air inlet 11.

Because the cross section of the accelerating flow channel is gradually reduced from bottom to top, the flow speed is continuously increased after the oil fume enters the accelerating flow channel, and the suction force of the oil fume is correspondingly increased, so that the oil fume can quickly enter the machine case 2 to be separated, and the oil fume suction amount in unit time of the range hood is further improved.

The lower surface of the smoke guide plate 8 may be entirely inclined, or may be partially inclined or partially flat. The inclined surface may be an inclined plane or an arc surface. In the present embodiment, the lower surface of the smoke guide plate 8 includes at least one of a first inclined surface 81, a second inclined surface 82 and a third inclined surface 83, wherein the first inclined surface 81 is inclined upward from the middle to the left side, a first accelerating flow path 84 is formed between the first inclined surface 81 and the left side plate 13 of the smoke collecting hood 1, the second inclined surface 82 is inclined upward from the middle to the right side, a second accelerating flow path 85 is formed between the second inclined surface 82 and the right side plate 14 of the smoke collecting hood 1, the third inclined surface 83 is inclined toward the front from the middle, and a third accelerating flow path 86 is formed between the third inclined surface 83 and the front side plate 15 of the smoke collecting hood 1. The inclined surfaces constitute the complete lower surface of the smoke guide plate 8. The inner surfaces (surfaces facing the inside of the smoke collecting chamber 12) of the left side plate 13, the right side plate 14, and the front side plate 15 may be inclined surfaces that gradually incline inward from bottom to top.

Therefore, the drainage and acceleration of the lampblack are realized by arranging the acceleration flow channel between the fume collecting hood 1 and the fume guide plate 8, so that the fume sucking quantity of the range hood in unit time is improved.

The four corners of smoke guide plate 8 upper surface are provided with spliced pole 87 respectively, be connected to the outward flange of air intake 11 of collection petticoat pipe 1, thereby be connected smoke guide plate 8 and collection petticoat pipe 1, spliced pole 87 can be fixed member, also can be by motor drive's telescopic link, the telescopic link can adopt prior art, thereby smoke guide plate 8 can be according to the size height-adjusting of oil smoke, in order to improve the oil smoke effect better, simultaneously when the range hood is closed, smoke guide plate 8 can rise to the highest position and close air intake 11, avoid the oil smoke backward flow of public flue.

A rotary filter screen 6 is arranged in the case 2 below the fan 4, and the rotary filter screen 6 is arranged below each muffler device and at the bottom of the case 2. That is, the rotary filter 6 is disposed at the inlet of the air duct 25, and the air duct 25 gradually decreases from bottom to top, so that the oil smoke passing through the rotary filter 6 is not accelerated by the air duct 25, and at this time, the oil smoke passes through the rotary filter 6 at the minimum flow rate, and the time of contact between the two is long, so that the oil smoke and the rotary filter 6 can collide fully, thereby achieving a better filtering effect.

The rotary filter screen 6 needs to keep a certain distance from the fan 4 to ensure that the oil smoke passes through the rotary filter screen 6 at a lower flow rate (the flow rate of the oil smoke is lower than that of the oil smoke accelerated by the air duct 25), so that the oil smoke is sufficiently filtered, and the rotary filter screen 6 rectifies the oil smoke to ensure that the oil smoke reaches the fan 4 through a certain flow path direction so as to ensure that the oil smoke is smooth enough; the distance between the two cannot be too far, otherwise the rotary screen 6 will exceed the maximum limit of the negative pressure zone of the fan 4. Therefore, it is preferable that the distance between the center of the fan 4 (typically the center of the ternary impeller 41) and the rotary screen 6 is 1.5 to 2 times the diameter of the ternary impeller 41. Because the air volume of the centrifugal fan is small, if the arrangement mode is adopted, the negative pressure (suction force) at the air inlet 11 cannot be ensured, so that the oil smoke absorbing effect is difficult to ensure, and only the three-way fan can adopt the arrangement mode.

The rotary screen 6 includes a screen tray 61 for filtering oil smoke and a motor 62 for driving the screen tray 61 to rotate. Referring to fig. 5, arc-shaped grooves 611 are formed on the surface of the net disk 61, the grooves 611 are through grooves penetrating through the net disk 61, at least two layers of groove 611 arrays can be radially formed on the surface of the net disk 61, and as the concentration distribution of the fume on the circumference is influenced by the rotating speed of the fan, the types of the impellers and the parameters of inlet and outlet angles before entering the fan impeller, the rigidity of the net disk 61 is improved after layered design, and on the other hand, each layer of groove 611 can be more freely distributed to the optimal width size according to the actual fume concentration distribution characteristic after a specific fan system is selected, and the filtering effect is improved as much as possible.

The array of grooves 611 are arranged in a centrally symmetrical circular ring shape, and each groove 611 extends radially, preferably with a uniform curvature and curvature. By providing radially extending grooves 611 having a certain curvature, the grease can smoothly flow from inside to outside when it contacts the mesh plate 61, and a higher centrifugal force can be obtained to achieve a higher efficiency of the centrifugal separation of the grease.

The motor 62 is disposed above the net tray 61, and an output shaft 621 of the motor 62 may be inserted into the center of the net tray 61 to be fixedly connected thereto, whereby the motor 62 may drive the net tray 61 to rotate. The left and right sides of the motor 62 are respectively connected and fixed with the left and right side walls 21 and 22 of the casing 2 through the motor bracket 622, thereby completing the installation of the rotary screen 6.

The rear end of the smoke guide plate 8 is provided with an oil drop hole 88, an oil cup 5 is arranged below the rear side of the smoke collecting cover 1, and the oil drop hole 88 is arranged above the oil cup 5, so that grease dropped from the machine case 2, the fan 4 and the rotary filter screen 6 can be received on the upper surface of the smoke guide plate 8, and is dropped into the oil cup 5 from the oil drop hole 88 at the rear end of the smoke guide plate 8, so that pollution to a cooking bench or a cooker is avoided.

Claims

1. The utility model provides a range hood, includes collection petticoat pipe (1), sets up quick-witted case (2) and fan (4) of setting in quick-witted case (2) in collection petticoat pipe (1), set up air intake (11) on collection petticoat pipe (1), be provided with smoke guide plate (8), its characterized in that below being located air intake (11): the fan (4) is a ternary fan, and at least one part of the lower surface of the smoke guide plate (8) gradually inclines upwards from the middle to the edge, so that the lower surface of the smoke guide plate is matched with the corresponding wall surface of the smoke collecting hood (1) to define an accelerating flow passage with the cross section gradually reduced from bottom to top;

the four corners of the upper surface of the smoke guide plate (8) are respectively provided with a connecting column (87), and the connecting columns (87) are connected to the outer edge of the air inlet (11) of the smoke collecting cover (1), so that the smoke guide plate (8) is connected with the smoke collecting cover (1);

an air duct (25) is formed in the case (2), a rotary filter screen (6) is arranged at the bottom in the case (2) and at the inlet of the air duct (25), the fans (4) are horizontally arranged and located at the top of the case (2), the fans (4) comprise ternary impellers (41), and the distance between the center of each fan (4) and the rotary filter screen (6) is 1.5-2 times the diameter of each ternary impeller (41).

2. The range hood of claim 1, wherein: the lower surface of the smoke guide plate (8) comprises at least one of a first inclined surface (81), a second inclined surface (82) and a third inclined surface (83), wherein the first inclined surface (81) is inclined upwards from the middle to the left side, a first accelerating flow channel (84) is formed between the first inclined surface and the left side plate (13) of the smoke collecting hood (1), the second inclined surface (82) is inclined upwards from the middle to the right side, a second accelerating flow channel (85) is formed between the second inclined surface and the right side plate (14) of the smoke collecting hood (1), and the third inclined surface (83) is inclined towards the front side from the middle to the third accelerating flow channel (86) is formed between the second inclined surface and the front side plate (15) of the smoke collecting hood (1).

3. The range hood of claim 2, wherein: the inner surfaces of the left side plate (13), the right side plate (14) and the front side plate (15) are inclined planes which are gradually inclined inwards from bottom to top.

4. The range hood of claim 1, wherein: the connecting column (87) is a telescopic rod driven by a motor.

5. The range hood according to any one of claims 1 to 4, wherein: the rotary filter screen (6) comprises a screen disc (61) for filtering oil smoke and a motor (62) for driving the screen disc (61) to rotate, an output shaft (621) of the motor (62) is inserted into the center of the screen disc (61) to be fixedly connected, and the motor (62) is fixedly connected with the chassis (2) through a motor bracket (622).

6. The range hood of claim 5, wherein: arc-shaped grooves (611) which are symmetrical along the center and are arranged in an array are formed in the surface of the net disc (61), each groove (611) extends along the radial direction of the net disc, and at least two layers of grooves (611) are distributed along the radial direction of the net disc (61).

7. The range hood of claim 5, wherein: the air duct (25) is in a shape gradually shrinking from bottom to top.

8. The range hood of claim 7, wherein: the case (2) comprises four side walls, at least one side wall is provided with a silencing device which gradually inclines towards the corresponding side wall from top to bottom, and the air duct (25) is positioned on the inner side of the silencing device away from the corresponding side wall.