CN109780595B - Fume exhauster - Google Patents

Abstract

The invention discloses a range hood, which comprises a fume collecting hood, a case and a fume filtering device, wherein the case is arranged above the fume collecting hood, an air inlet is formed in the fume collecting hood, an air duct is formed in the case, the fume filtering device comprises an oil net arranged at the air inlet, the oil net is integrally in a cone shape which is large at the upper part and small at the lower part and extends downwards from the air inlet, a fan system is arranged in the case, the fan system comprises a first ternary fan and a second ternary fan which are arranged in parallel, and the fume filtering device also comprises a rotary filter screen arranged in the case and at the inlet of the air duct. Through setting up oil net and rotary filter screen, the oil net can be to air current rectification and guide, and rotary filter screen is favorable to the air current evenly distributed at the air intake to make the oil smoke that gets into in the wind channel can get into the air inlet intracavity that corresponding fan corresponds respectively, gas is at every air inlet intracavity independent flow, avoids appearing the phenomenon of robbing the wind between the air intake of two adjacent fans, and then makes the amount of wind of every air intake department of twin-blower even.

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 oil smoke filter device is an important component of the range hood, and technical improvement on the oil smoke filter device is always a technical hot spot in the field of the range hood. The existing range hood is provided with a filter screen for collecting oil smoke, smoke dust and the like generated in cooking, such as a range hood disclosed in China patent with the application number of 201310359754.1, and comprises an oil filter screen, an oil receiving box and a fan assembly, wherein the oil receiving box is arranged below the oil filter screen, the oil smoke firstly passes through the oil filter screen to mechanically filter oil, and the filtered large-particle grease can fall into the oil receiving box due to the action of gravity; as disclosed in the chinese patent application No. 201610642513.1, the bionic filter screen is a metal thin shell of a cone, a cuboid or a square cone with a big top and a small bottom, and is arranged at the smoke cage at the lower end of the main machine of the range hood and at the air inlet at the upper end of the oil cup.

In recent years, the multilayering of oil nets and the meandering of oil smoke air flow channels are becoming a technical trend. The oil guiding structure of the novel European style range hood disclosed in China patent with the application number of 201410013980.9 comprises an outer oil net and a net rack positioned and arranged on the inner side of the outer oil net, wherein a plurality of through first vent holes and third vent holes are respectively formed in the outer oil net and the net rack, oil guiding grooves are formed in the periphery of the plurality of first vent holes, the openings of the plurality of oil guiding grooves face the interior of the range hood, the plurality of oil guiding grooves are communicated with each other to form a path for oil drops to flow, and a plurality of flat inner oil nets are positioned and arranged between the outer oil net and the net rack; another example is a compound screen panel of lampblack absorber that chinese patent of application number is 20161013691. X discloses, including the screen panel body, the screen panel body includes lateral part and bottom, and lateral part integrated into one piece has the round interval to set up and by outside-in convex boss, and the boss is rectangular form structure and one end setting at lateral part upper end edge, and the other end setting constitutes the oil groove between two adjacent bosses of lateral part internal surface, and a plurality of meshes are densely distributed at the boss top.

The existing multi-layer oil nets have the average proportion of the ventilation hole area of each layer of oil net to the total area of the layer of oil net not exceeding 50 percent. The exhaust efficiency and the noise of the range hood can be directly influenced by the proportion of the area of the vent hole to the total area of the oil net. And the filtering and rectifying functions cannot be achieved by only using a plurality of layers of oil nets. Therefore, further improvements are still needed.

Disclosure of Invention

The invention aims to solve the technical problems of the prior art and provides a range hood capable of improving the efficiency of fume suction and reducing noise.

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 quick-witted case and the oil smoke filter equipment in collection petticoat pipe top, be formed with the air intake on the collection petticoat pipe, the machine incasement is formed with the wind channel, the oil smoke filter equipment is including setting up the oil net of air intake department, the oil net is big-end-up, by the toper of air intake department downwardly extending wholly, the machine incasement is provided with fan system, its characterized in that: the fan system comprises a first ternary fan and a second ternary fan which are arranged in parallel, and the oil smoke filtering device further comprises a rotary filter screen arranged in the machine box and at the inlet of the air duct.

For being convenient for carry out the water conservancy diversion to the oil smoke for the oil smoke gas gets into the range hood more smoothly, and furthest strengthens the range hood's oil absorption ability, and ensure sufficient air inlet area, can avoid the direct whereabouts of oil droplet again to the top of a kitchen range on, the oil net includes inlayer oil net and the outer oil net of setting in inlayer oil net periphery, inlayer oil net includes inlayer net body and sets up the first ventilation hole on inlayer net body, outer oil net includes outer net body and sets up the second ventilation hole on outer net body, first ventilation hole is less than the second ventilation hole, first ventilation hole and second ventilation hole staggered arrangement make orthographic projection partially overlap on same horizontal plane.

In order to reduce the noise of oil smoke passing through, ensure enough air inlet area and ensure better filtering effect, the first ventilation holes are diamond-shaped, the length of each first ventilation hole is 1.0-2.0 mm, the width of each first ventilation hole is 1.0-2.0 mm, and the shortest edge distance between any two adjacent first ventilation holes is 0.3-0.6 mm.

Preferably, in order to facilitate the arrangement of the rotary filter screen, the rotary filter screen comprises a net disk for filtering oil smoke 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 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 prevent grease of machine case and fan from dripping to the range hood below, the machine incasement is located rotatory filter screen below and is provided with the oil receiving dish, the oil receiving dish includes a set body, the shape, the size of set body and the cross section adaptation of machine case to the edge of set body is located the below of machine case, and extends the bottom edge of machine case and support in the air intake edge below of collection petticoat pipe.

In order to be convenient for guide the oil smoke air current, the centre of disk body forms the opening, the disk body upwards extends certain distance in the opening part and forms the water conservancy diversion portion, water conservancy diversion portion is relative with rotatory filter screen, rotatory filter screen's edge exceeds water conservancy diversion portion.

For on the basis of not changing the machine case size, increase the amount of wind, first ternary fan includes first ternary impeller and first air intake, the ternary fan of second includes second ternary impeller and second air intake, on the oil smoke flow path, second air intake is equal with first air intake position, first air intake and second air intake set up side by side to the left and right sides of quick-witted case respectively.

Preferably, in order to reduce wind resistance and improve the oil fume absorbing effect on the premise of not increasing the size of the case, the first ternary impeller of the first ternary fan and the second ternary impeller of the second ternary fan respectively form 60-90 degrees with the horizontal direction, and the two ternary impellers incline towards opposite directions.

According to one aspect of the invention, the first ternary fan further comprises a first volute, the first ternary impeller is arranged in the first volute, the second ternary fan further comprises a second volute, the second ternary impeller is arranged in the second volute, the first volute and the second volute are arranged at intervals and side by side, the first air inlet is formed in the first volute, the second air inlet is formed in the second volute, a first oil smoke channel is formed in the first volute, a first air outlet is formed at the top end of the first oil smoke channel, a second oil smoke channel is formed in the second volute, and a second air outlet is formed at the top end of the second oil smoke channel.

According to another aspect of the invention, the first ternary impeller and the second ternary impeller are arranged at intervals and side by side in the same volute, a first air inlet corresponding to the first ternary impeller and a second air inlet corresponding to the second ternary impeller are respectively formed at two opposite sides of the volute, a mounting plate is arranged between the first ternary impeller and the second ternary impeller and extends to the top end of the volute, so that the interior of the volute is divided into two independent first oil smoke channels and second oil smoke channels, the top end of each first oil smoke channel forms a first air outlet, and the top end of each second oil smoke channel forms a second air outlet.

In order to drive two impellers simultaneously, the device further comprises a driving motor arranged between the first ternary impeller and the second ternary impeller, and the driving motor is provided with double output shafts for driving the first ternary impeller and the second ternary impeller respectively.

For playing the guide effect to the gas of the corresponding export of two ternary fans, be favorable to the outlet gas to form laminar flow to reduce by a wide margin flow loss, raise the efficiency, fan system's air outlet department is provided with the air outlet cover, the air outlet cover is including being hollow tube-shape's cover body, the cover body has relative, open-ended first end and second end, the bore of first end is greater than the bore of second end, be provided with first guide plate and second guide plate in the cover body, every guide plate extends to the second end from the first end of cover body, form first diffusion runner between the inside wall of first guide plate and the cover body, form the second diffusion runner between the inside wall of second guide plate and the cover body, the cross-sectional area of first diffusion runner and second diffusion runner is reduced by the first end of the cover body to the second end respectively, first runner corresponds with the first air outlet of first ternary fan in the first end department of the cover body, the second diffusion runner corresponds with the second diffusion of second ternary fan in the first end department of the cover body.

Compared with the prior art, the invention has the advantages that: through setting up oil net and rotary filter screen, the oil net can be to air current rectification and guide, and rotary filter screen is favorable to the air current to distribute at the air intake uniformly to make the oil smoke that gets into in the wind channel can get into the air inlet chamber that corresponding fan corresponds respectively, and gas flows independently in every air inlet chamber, avoids appearing the phenomenon of robbing the wind between the air intake of two adjacent fans, and then makes the amount of wind of every air intake department of two fans even; by arranging the double-layer oil nets, because the ventilation holes of the two layers of oil nets are arranged in a staggered manner, oil drops dropping in the cavity can be blocked, so that the oil drops can not directly drop on the cooking bench, the air inlet area of the oil nets is ensured by limiting the arrangement mode of inner-layer meshes, the sizes of the meshes and the intervals among the meshes, and the outer-layer oil nets play a role in guiding the oil fume gas, so that the oil fume gas can more smoothly enter the range hood; the rotary filter screen is arranged at the air duct inlet in the case, so that the oil smoke passes through the rotary filter screen at a lower flow rate, the time of mutual contact between the rotary filter screen and the oil smoke is longer, and the oil smoke and the rotary filter screen can be fully collided, so that a better filtering effect is achieved.

Drawings

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

fig. 2 is a sectional view of a range hood according to an embodiment of the present invention;

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

fig. 4 is a schematic view of an oil screen of a range hood according to an embodiment of the present invention;

FIG. 5 is an exploded view of the oil screen of FIG. 4;

fig. 6 is a schematic view of a rotary screen of a range hood according to an embodiment of the present invention;

fig. 7 is a schematic view of an oil pan of a range hood according to an embodiment of the present invention;

FIG. 8 is a cross-sectional view of a first embodiment of a fan system and an outlet hood of the extractor hood of the present invention;

fig. 9 is a schematic view of an outlet hood of the range hood of fig. 1;

fig. 10 is a schematic view of a fan system and a second embodiment of an outlet hood of the range hood of the present invention;

fig. 11 is a cross-sectional view of a fan system and an outlet hood of the range hood of fig. 10.

Detailed Description

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

Example 1

Referring to fig. 1 to 3, the range hood comprises a fume collecting hood 1 and a case 2 arranged above the fume collecting hood 1, wherein a fan system 4 is arranged in the case 2. The fume collecting hood 1 is provided with an air inlet 11, so that the fan system 4 in the case 2 can suck fume, enter the case 2 through the air inlet 11 and then are discharged to a public flue.

An air duct 25 is formed in the case, and the air duct 25 is preferably gradually reduced from bottom to top.

The fan system 4 in the case 2 adopts a ternary fan, and can adopt the prior art, such as the fan structure disclosed in the patent of the applicant with the application number of 201620102790.9, and an air outlet of the fan system 4 is provided with an air outlet cover 5 for discharging the oil smoke discharged by the fan system 4 to an air outlet pipeline. The specific structure of the fan system 4 will be described in detail below.

The range hood further comprises a fume filtering device, in this embodiment two filters are used, comprising an upstream oil screen 8 and a downstream rotary screen 6. The rotary filter screen 6 is arranged in the case 2 and below the fan system 4 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 system 4 to ensure that the oil smoke passes through the rotary filter screen 6 at a low flow rate so as to be filtered fully, and after the vortex of the oil smoke is broken by the rotary filter screen 6, the oil smoke reaches the fan system 4 through a flow path with a certain distance so as to ensure that the oil smoke is enough to be smooth; 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 system 4. The structure of the rotary screen 6 will be described in detail below.

The oil net 8 is arranged at the air inlet 11, and an oil cup 9 is arranged at the bottom of the oil net 8. The oil screen 8 is in a cone shape with a large upper part and a small lower part, and extends downwards from the air inlet 11. Referring to fig. 2, 4 and 5, the oil screen 8 includes an inner oil screen 81 and an outer oil screen 82 provided at the outer periphery of the inner oil screen 81, and both the inner oil screen 81 and the outer oil screen 82 have a tapered shape with large upper portions and small lower portions.

The inner layer oil net 81 comprises an inner layer net body 811 and a first vent hole 812 formed in the inner layer net body 811, in this embodiment, the first vent hole 812 is diamond-shaped, noise generated when oil smoke passes through the inner layer oil net 81 is reduced, and grease molecules with uneven sizes are guided into grease molecules with even sizes, so that the rotary filter screen 6 at the rear end can remove oil better. The thickness of the inner net body 81 is preferably 0.3 to 1mm, the length of the first ventilation holes 812 is 1.0 to 2.0mm, the width (the length of the shorter one of the diagonal lines) is 1.0 to 2.0mm, and the shortest edge distance between any two adjacent first ventilation holes 812 is 0.3 to 0.6mm, thereby not only ensuring the air inlet area of the inner net 81, but also ensuring a better filtering effect.

The outer oil screen 82 includes an outer screen body 821 and a second ventilation hole 822 formed in the outer screen body 821. The outer layer net body 821 is provided with four side walls which are all obliquely arranged, so that the oil smoke can be guided in four directions, the oil smoke gas can enter the range hood more smoothly, and the oil smoke absorbing capacity of the range hood is enhanced to the greatest extent. The second ventilation holes 822 are rectangular or elliptical extending vertically, and have a width of 6mm to 10mm, and the shortest side distance between any two adjacent second ventilation holes 822 is 2mm to 5mm.

The first ventilation holes 811 and the second ventilation holes 821 are staggered, that is, orthographic projections of the first ventilation holes 811 and the second ventilation holes 821 on the same horizontal plane are partially overlapped to form an overlapped part, the sizes of the two ventilation holes are different, the staggered part increases the oil smoke collecting area, and the overlapped part can block oil drops dropping in the range hood, so that the oil drops cannot directly drop on the cooking bench.

The oil smoke sucked into the negative pressure area is contacted with the oil net 8 before entering the air inlet channel, so that large-particle grease is attached to the inner oil net 81, and the large-particle grease is prevented from entering the range hood. The oil net 8 forms multiple oil particle separation such as condensation, rectification, impact and the like by overlapping and staggered two layers of oil nets under high-speed air flow, so that the oil smoke is absorbed more cleanly.

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. 2 and 6, arc-shaped grooves 611 are formed on the surface of the net disk 61, the grooves 611 are through grooves penetrating 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 inlet and outlet angle parameters before the fume enters the fan impeller, the rigidity of the net disk 61 is improved after layered design, and on the other hand, each layer of grooves 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 of the cabinet 2 through the motor bracket 622, thereby completing the installation of the rotary screen 6.

The bottom end of the cabinet 2 extends to the air inlet 11 of the fume collecting hood 1, and an oil receiving disc 7 is arranged in the cabinet 2 below the rotary filter screen 6, and referring to fig. 7, the oil receiving disc 7 comprises a disc body 71 and a flow guiding part 72, the shape and the size of the disc body 71 are matched with the cross section of the cabinet 2, the disc body 71 is horizontally or nearly horizontally arranged in the cabinet 2, and the edge of the disc body 71 is arranged below the cabinet 2 and beyond the bottom end edge of the cabinet 2 to be supported below the edge of the air inlet 11 of the fume collecting hood 1. Thus, the grease dropped in the casing 2 and the grease thrown out by the fan system 4 can fall onto the tray body 71. The sides of the air duct 25 of the housing 2 are inclined to facilitate the introduction of oil thrown off by the fan system 4 onto the pan body 71.

The middle of the disk body 71 forms an opening 711, the disk body 71 extends upwards at the opening 711 for a certain distance to form a diversion part 72, the diversion part 72 is opposite to the screen disk 61 of the rotary filter screen 6, the cross sections of the opening 711 and the diversion part 72 can also be round, and the edge of the screen disk 61 can exceed the diversion part 72, so that grease thrown out of the rotary filter screen 6 can fall onto the disk body 71, and meanwhile, the diversion part 72 can also play a role in diversion of the oil fume entering from the fume collecting hood 1.

Referring to fig. 2, 8 and 9, in the present embodiment, the fan system 4 preferably includes two independently operable first and second tertiary fans 41 and 42, which are disposed in parallel. By using the ternary impeller, compared with a centrifugal fan, the flow efficiency can be greatly increased, and the air quantity can be improved.

The first tertiary fan 41 includes a first scroll 411 and a first tertiary impeller 412 disposed within the first scroll 411, and the second tertiary fan 42 includes a second scroll 421 and a second tertiary impeller 422 disposed within the second scroll 421. The first volute 411 and the second volute 421 are arranged side by side at intervals, a first air inlet 413 is formed on the first volute 411, a second air inlet 423 is formed on the second volute 421, the air inlets of the two volutes are far away from each other, namely, the air inlet 313 of the first volute 411 is formed on one side far away from the second volute 421, the two volutes are arranged back to back, so that the two three-way fans are arranged side by side left and right, and the first air inlet 413 faces the left side of the case 2, and the second air inlet 423 faces the right side of the case 2. When the fume enters from the fume collecting hood 1, the fume enters into the fan system 4 from the left side and the right side respectively. A first oil smoke channel 441 is formed in the first volute 411, a first air outlet 414 is formed at the top end of the first oil smoke channel 441, a second oil smoke channel 442 is formed in the second volute 421, a second air outlet 424 is formed at the top end of the second oil smoke channel 442, and the first air outlet 414 and the second air outlet 424 are arranged side by side at intervals.

The first tertiary impeller 412 and the second tertiary impeller 422 may employ prior art techniques, such as those disclosed in applicant's application number 201620102790.9. The first and second three-way impellers 412 and 422 share the same driving motor 43, the driving motor 43 is disposed between the first and second volutes 411 and 421, and the driving motor 43 has a double output shaft, so that the output shaft 431 extending leftwards may be connected to the first three-way impeller 412 to drive the first three-way impeller 412 to operate, and the output shaft 431 extending rightwards may be connected to the second three-way impeller 422 to drive the second three-way impeller 422 to operate. Therefore, the two ternary fans have good synchronism, and meanwhile, energy sources can be saved.

The first and second three-way impellers 412 and 422 may respectively form 60 to 90 ° with the horizontal direction, and the two impellers are inclined in opposite directions (the first three-way impeller 412 is inclined to the left and the second three-way impeller 422 is inclined to the right), thereby reducing wind resistance and improving the oil fume absorbing effect. The center of the first ternary impeller 412 is kept at a certain distance from the inlet of the air duct 25 of the range hood, which is 1-2 times the diameter of the first ternary impeller 412, the center of the second ternary impeller 422 is kept at a certain distance from the inlet of the air duct 25 of the range hood, which is 1-2 times the diameter of the second ternary impeller 422, and the distance between the center of the impeller and the inlet of the air duct 25 must be greater than the diameter of the impeller, so that the rotary filter screen 26 at the inlet of the air duct 25 can only work, but cannot be greater than 2 times the diameter, otherwise, the distance from the negative pressure area is too far.

The two ternary fans can adopt the same structure, and the overall size of the fan system is smaller in the arrangement mode, so that the original size of the case 2 is not changed, the air quantity can be doubled under the condition of keeping higher air pressure, and the oil fume suction efficiency is improved. The two air inlets face to the left and the right sides respectively, so that the area of the negative pressure areas at the periphery of the two sides is increased, the two air inlets are suitable for two cooking heads, and the effect of no smoke leakage is achieved; the noise propagation path is directed to the left and right sides, not toward the user as in the prior art, thereby reducing noise.

An air outlet cover 5 is arranged above the fan system 4, and a cover body 51 of the air outlet cover 5 covers a first air outlet 414 of a first volute 411 of the first ternary fan 41 and a second air outlet 424 of a second volute 421 of the second ternary fan 42 and are communicated. In this embodiment, the air outlet cover 5 includes a cover body 51 and a deflector disposed in the cover body 51. The hood 51 is hollow and cylindrical, and has opposite first and second ends 511 (lower and upper ends) and 512, the first end 511 having a larger diameter than the second end 512, i.e., the opening gradually decreases from a position closer to the fan system 4 to a position farther from the fan system 4, and the flow of soot enters the hood 51 from the first end 511 and exits the hood 51 from the second end 512 into an external duct connected to the exhaust hood 5.

The baffle includes a first baffle 521 and a second baffle 522, the first baffle 521 extends from the first end 511 to the second end 512 of the housing 51, and the first baffle 521 corresponds to a first edge 415 (a right edge of the first air outlet) of the first air outlet 414 of the first tertiary fan 41 near the second air outlet 424 of the second tertiary fan 42, at the first end 511 of the housing 51, and the second baffle 522 corresponds to a second edge 425 (a left edge of the second air outlet) of the second air outlet 424 of the second tertiary fan 42 near the first air outlet 414 of the first tertiary fan 41. Each baffle has a width extending in the front-to-rear direction. The first baffle 521 is gradually inclined toward the second baffle 522 (rightward) from the first end 511 to the second end 512, and the second baffle 522 is gradually inclined toward the first baffle 521 (leftward) from the first end 511 to the second end 512, i.e., each baffle extends from a position offset from the middle of the bottom of the casing 51 toward a position in the middle of the top of the casing 51. The top ends of the first baffle 521 and the second baffle 522 (near the second end 512 of the shroud 51) are connected to each other, and preferably, the connection between the two baffles is rounded, so as to guide the air flow to smoothly transition.

The front and rear side edges 5211, 5212 of the first baffle 521 are always connected to the inner side wall of the cover 51, and the front and rear side edges 5221, 5222 of the second baffle 522 are always connected to the inner side wall of the cover 51. The interior of the housing 51 is thus divided into a first diffusion flow passage 531 between the inner side wall of the housing 51 and the first baffle 521, and a second diffusion flow passage 532 between the inner side wall of the housing 51 and the second baffle 522, the first diffusion flow passage 531 and the second diffusion flow passage 532 being independent of each other. The first diffuser 531 corresponds to the first air outlet 414 of the first tertiary fan 41 at the first end 511 of the housing 51, i.e., completely covers the first air outlet 414, and the second diffuser 532 corresponds to the second air outlet 424 of the second tertiary fan 42 at the first end 511 of the housing 51, i.e., completely covers the second air outlet 424. The cross-sectional area of the first diffusion flow channel 531 gradually decreases from the first end 511 to the second end 512, and the cross-sectional area of the second diffusion flow channel 532 gradually decreases from the first end 511 to the second end 512, so that the outlet speed at the top of the first diffusion flow channel 531 is greater than the outlet speed at the bottom of the first diffusion flow channel 531, and the outlet speed at the top of the second diffusion flow channel 532 is greater than the outlet speed at the bottom of the second diffusion flow channel 532.

By providing the above-described baffle, the air flow speeds of the first diffuser 531 communicating with the first air outlet 414 of the first three-way fan 41 and the second diffuser 42 communicating with the second air outlet 424 of the second three-way fan 42 are made close to each other. The diversion effect of the air outlet cover 5 is beneficial to the formation of laminar flow of the outlet air, and the air enters the external pipeline after forming the laminar flow, so that the defect that the air flow directly enters the external pipeline in a turbulent state after exiting from the volute is avoided, and the strong friction and impact during the mixing of the air flows at the air outlets of the two three-way fans are also avoided, thereby greatly reducing the flow loss and improving the efficiency.

The sound absorbing holes 54 are densely distributed on the first baffle 521 and/or the second baffle 522, which is beneficial to reducing outlet noise. To further reduce noise, a partition 55 may be further provided in the space between the first and second baffles 521 and 522 such that the space between the first and second baffles 521 and 522 is partitioned into at least two resonant cavities 551. Alternatively, sound absorbing cotton may be provided in a space between the first baffle 521 and the second baffle 522. Alternatively, the baffle 55 may be replaced with a reinforcing rib to enhance the strength of the baffle.

The parallel double fans are vertically arranged, so that the strongest negative pressure area of the fan system 4 is opposite to the air flow entering from the left side and the right side, and the double air inlet channels on the smoke collecting plate 3 can enable the air flow entering from the lower side to enter the fan system 4 from the area with strongest negative pressure from the left side and the right side, and the escape rate of oil smoke is reduced.

Through setting up oil net 8 and rotary filter screen 6, oil net 8 can be to air current rectification and guide, and rotary filter screen 6 is favorable to the air current evenly distributed at the air intake to make the oil smoke that gets into in wind channel 25 can get into the air inlet intracavity that corresponding fan corresponds respectively, and gas is at every air inlet intracavity independent flow, avoids appearing the phenomenon of robbing the wind between the air intake of two adjacent fans, and then makes the amount of wind of every air intake department of twin-blower even.

Example two

Referring to fig. 10 and 11, in the present embodiment, the difference from the first embodiment described above is that the first tertiary fan 41 and the second tertiary fan 42 share the same volute 44, that is, the first tertiary impeller 412 of the first tertiary fan 41 and the second tertiary impeller 422 of the second tertiary fan 42 are disposed together in the same volute 44.

A mounting plate 45 is provided between the two three-way impellers so as to separate the two three-way impellers on both sides of the mounting plate 45, and the mounting plate 45 extends to the top end of the volute 44 so as to separate the interior of the volute 44 into two independent first oil smoke channel 441 and second oil smoke channel 442. The driving motor 43 passes through the mounting plate 45 and is fixedly connected with the mounting plate 45.

In the present embodiment, the air outlet cover 5 includes only the cover body 51 and the baffle 56 disposed in the cover body 51, the baffle 56 extends in the flow direction of the oil smoke, and in the present embodiment, the baffle 56 is located corresponding to the mounting plate 45 so as to partition the cover body 51 into the independent first diffuser 531 and the second diffuser 532 corresponding to the oil smoke passage in the volute 44.

Alternatively, the air outlet cover 5 may also adopt the structure of the first embodiment.

Claims (10)

1. The utility model provides a range hood, includes collection petticoat pipe (1), sets up quick-witted case (2) and the oil smoke filter equipment in collection petticoat pipe (1) top, be formed with air intake (11) on collection petticoat pipe (1), be formed with wind channel (25) in machine case (2), the oil smoke filter equipment is including setting up oil net (8) of air intake (11) department, oil net (8) are big-end-up, by the toper of air intake (11) department downwardly extending wholly, be provided with fan system (4) in machine case (2), its characterized in that: the fan system (4) comprises a first ternary fan (41) and a second ternary fan (42) which are arranged in parallel, and the oil smoke filtering device further comprises a rotary filter screen (6) which is arranged in the machine case (2) and at the inlet of the air duct (25);

the first ternary fan (41) comprises a first ternary impeller (412) and a first air inlet (413), the second ternary fan (42) comprises a second ternary impeller (422) and a second air inlet (423), on the oil smoke flow path, the second air inlet (423) is identical to the first air inlet (413) in position, and the first air inlet (413) and the second air inlet (423) are arranged in parallel and face the left side and the right side of the case (2) respectively;

the first ternary fan (41) further comprises a first volute (411), the first ternary impeller (412) is arranged in the first volute (411), the second ternary fan (42) further comprises a second volute (421), the second ternary impeller (422) is arranged in the second volute (421), the first volute (411) and the second volute (421) are arranged at intervals and side by side, the first air inlet (413) is formed in the first volute (411), the second air inlet (423) is formed in the second volute (421), a first oil smoke channel (441) is formed in the first volute (411), a first air outlet (414) is formed at the top end of the first oil smoke channel (441), a second oil smoke channel (442) is formed in the second volute (421), and a second air outlet (424) is formed at the top end of the second oil smoke channel (442);

an air outlet cover (5) is arranged at an air outlet of the fan system (4), the air outlet cover (5) comprises a cover body (51) which is hollow and cylindrical, the cover body (51) is provided with a first end (511) and a second end (512) which are opposite and open, the caliber of the first end (511) is larger than that of the second end (512), a first guide plate (521) and a second guide plate (522) are arranged in the cover body (51), each guide plate extends from the first end (511) to the second end (512) of the cover body (51), a first diffusion flow channel (531) is formed between the first guide plate (521) and the inner side wall of the cover body (51), a second flow channel (532) is formed between the second guide plate (522) and the inner side wall of the cover body (51), the diffusion sectional areas of the first diffusion flow channel (531) and the second diffusion flow channel (532) are gradually reduced from the first end (511) to the second end (512) of the cover body (51) respectively, the diffusion sectional areas of the first diffusion flow channel (531) and the inner side wall of the first diffusion channel (51) are correspondingly reduced from the first end (511) to the second end (512) of the fan, the second diffusion flow passage (532) corresponds to a second air outlet (424) of the second ternary fan (42) at the first end (511) of the cover body (51);

the first guide plate (521) is gradually inclined towards the second guide plate (522) from the first end to the second end, the second guide plate (522) is gradually inclined towards the first guide plate (521) from the first end to the second end, and the top ends of the first guide plate (521) and the second guide plate (522) are mutually connected.

2. The range hood of claim 1, wherein: the oil net (8) comprises an inner-layer oil net (81) and an outer-layer oil net (82) arranged on the periphery of the inner-layer oil net (81), the inner-layer oil net (81) comprises an inner-layer net body (811) and first vent holes (812) formed in the inner-layer net body (811), the outer-layer oil net (82) comprises an outer-layer net body (821) and second vent holes (822) formed in the outer-layer net body (821), the first vent holes (812) are smaller than the second vent holes (822), and the first vent holes (812) and the second vent holes (822) are staggered so that orthographic projections on the same horizontal plane are partially overlapped.

3. The range hood of claim 2, wherein: the first ventilation holes (812) are diamond-shaped, the length of each first ventilation hole (812) is 1.0-2.0 mm, the width of each first ventilation hole (812) is 1.0-2.0 mm, and the shortest edge distance between any two adjacent first ventilation holes (812) is 0.3-0.6 mm.

4. A range hood according to any one of claims 1 to 3, 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).

5. The range hood of claim 4, 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).

6. The range hood of claim 4, wherein: the air duct (25) is in a shape gradually shrinking from bottom to top.

7. A range hood according to any one of claims 1 to 3, wherein: the novel smoke collecting device is characterized in that an oil receiving disc (7) is arranged in the case (2) and below the rotary filter screen (6), the oil receiving disc (7) comprises a disc body (71), the shape and the size of the disc body (71) are matched with the cross section of the case (2), and the edge of the disc body (71) is located below the case (2) and extends out of the bottom edge of the case (2) to be supported below the edge of an air inlet (11) of the smoke collecting cover (1).

8. The range hood of claim 7, wherein: an opening (711) is formed in the middle of the disc body (71), the disc body (71) extends upwards at the opening (711) for a certain distance to form a flow guide part (72), the flow guide part (72) is opposite to the rotary filter screen (6), and the edge of the rotary filter screen (6) exceeds the flow guide part (72).

9. A range hood according to any one of claims 1 to 3, wherein: the first ternary impeller (412) of the first ternary fan (41) and the second ternary impeller (422) of the second ternary fan (42) are respectively 60-90 degrees with the horizontal direction, and the two ternary impellers are inclined towards opposite directions.

10. A range hood according to any one of claims 1 to 3, wherein: the motor (43) is arranged between the first ternary impeller (412) and the second ternary impeller (422), and the motor (43) is provided with double output shafts for driving the first ternary impeller (412) and the second ternary impeller (422) respectively.