CN114412807B

CN114412807B - Box type low noise fan special for kitchen

Info

Publication number: CN114412807B
Application number: CN202210327752.3A
Authority: CN
Inventors: 郭红飞; 霍慧; 胡锦康
Original assignee: Foshan City Nanhai Popula Fan Co ltd
Current assignee: Foshan City Nanhai Popula Fan Co ltd
Priority date: 2022-03-31
Filing date: 2022-03-31
Publication date: 2022-06-07
Anticipated expiration: 2042-03-31
Also published as: CN114412807A

Abstract

The invention relates to the technical field of fans, in particular to a box-type low-noise special fan for a kitchen, which comprises a volute, a power assembly, a sound insulation box, a fan wheel, an air outlet sealing element and an air guide element, wherein the volute is arranged on the top of the volute; the volute comprises a spiral plate and a volute side plate; the volute is provided with an air outlet groove communicated with the inner cavity of the spiral plate; the volute side plate is provided with an air collecting opening; the wind impeller is at least partially positioned in the spiral plate; the sound insulation box is provided with a front air outlet and a rear air inlet, the volute is fixed in the sound insulation box, the air collecting port is communicated with the inner cavity of the sound insulation box, and the air outlet groove is communicated with the front air outlet; the power assembly is in driving connection with the wind impeller; the sound insulation box comprises a bottom sealing plate provided with an oil leakage opening; the air outlet sealing piece can close the front air outlet, and the spiral plate is provided with a second air outlet communicated with the air outlet groove; the air guide piece is provided with an air guide inlet and an air guide outlet, the air guide inlet is communicated with the second air outlet, and the air guide outlet faces the bottom sealing plate and the oil leakage port. The invention can improve the oil stain removing effect and speed.

Description

Box type low noise fan special for kitchen

Technical Field

The invention relates to the technical field of fans, in particular to a box-type low-noise fan special for a kitchen.

Background

With the rapid development of the fan industry, people continuously put forward new requirements on the performance and the structure of the fan. The fans used in various industries have specific use environments, and in the industries of kitchen purification and air purification, the fans need to have the characteristics of large air quantity and convenience in installation, and have higher requirements on sealing and noise reduction of the fans.

The conventional transmission mode of the kitchen blower adopts a direct-connected single unit single air inlet mode, a box body is not designed for sound insulation, the noise is large in the using process, and the air volume cannot meet the requirement. Although the conventional box type fan is designed with a box body to reduce noise, the box type fan on the market can only be used for ventilation in a common working environment; secondly, because the tank body does not have an oil leakage prevention design, after the tank body is used for a long time, oil stains can leak out from gaps of the tank body to pollute a working environment, and the oil stains which cannot leak out are accumulated in the tank body and are difficult to remove; moreover, the bearing is arranged in the box body, and under the combined action of the oil smoke and the steam, the bearing is easy to damage, and the service life of the bearing is shortened.

Disclosure of Invention

It is an object of the present invention to provide a box-type low noise kitchen fan which solves or alleviates the above technical problems.

The invention adopts the measure that the box type low-noise special fan for the kitchen comprises a volute, a power assembly, a sound insulation box and a fan wheel provided with fan blades; the volute comprises a spiral plate and volute side plates fixed on two sides of the spiral plate; the volute is provided with an air outlet groove communicated with the inner cavity of the spiral plate, and the inner wall of the bottom end of the air outlet groove is tangent to the inner wall of the spiral plate; the volute side plate is provided with an air collecting opening; the wind impeller is at least partially positioned in the spiral plate; when viewed along the axis of rotation of the impeller, the inner edge of the spiral plate is spiral; the sound insulation box is provided with a front air outlet and a rear air inlet, the volute is fixed in the sound insulation box, the air collecting port is communicated with the inner cavity of the sound insulation box, and the air outlet groove is communicated with the front air outlet; the power assembly is in driving connection with the wind impeller; the sound insulation box comprises a bottom sealing plate provided with an oil leakage opening, the box-type low-noise kitchen special fan further comprises an air outlet sealing piece and an air guide piece, the air outlet sealing piece is movably connected with the sound insulation box and can close a front air outlet, and the spiral plate is provided with a second air outlet communicated with the air outlet groove; the air guide piece is provided with an air guide inlet and an air guide outlet, the air guide inlet is communicated with the second air outlet, and the air guide outlet faces the bottom sealing plate and the oil leakage port.

The invention can ensure that the swirl of the airflow in the spiral plate is reduced, ensure the air outlet pressure, and improve the oil stain removing effect and the oil stain removing speed.

Further technical scheme, sound-proof box still includes preceding shrouding, back shrouding, top shrouding and two side shrouding, and preceding shrouding, back shrouding, top shrouding, end shrouding and two side shroudings are riveted into box structure each other.

This further technical scheme, when being convenient for make the sound-proof box, can ensure the leakproofness of sound-proof box.

According to the further technical scheme, the oil leakage opening is provided with a detachable plug, and the oil leakage opening is sealed by the plug.

The plug is detached, so that oil stains accumulated on the bottom sealing plate can be conveniently discharged.

According to the technical scheme, the wind impeller further comprises a wind impeller shaft, the side sealing plates comprise side combination plates and a supporting plate with a U-shaped cross section, the side combination plates are fixedly connected with the side edges of the supporting plate to form the side sealing plates, the supporting plate is fixedly provided with a bearing, the wind impeller shaft penetrates through the bearing, the bottom end of the supporting plate is fixedly connected with the bottom sealing plate, and the bearing is located outside the sound insulation box.

The bearing plate can provide great bearing capacity, improves the reliability, and the bearing is difficult for contacting oil smoke and steam, long service life.

According to the technical scheme, the wind impeller comprises two wind impeller members which are attached to each other, the fan blades are arranged on the wind impeller members, and the two wind impeller members which are attached to each other are mirror-symmetrical about planes of the two wind impeller members which are attached to each other.

The wind impeller is universal left and right during installation, high in universality and stable in operation.

Further technical scheme still includes the shielding piece, and the second air outlet is seted up in the bottom inner wall of air-out groove, and the shielding piece is articulated and can be rotatory around the horizontal axis with the lateral wall of air-out groove, and the shielding piece is rotatory to be closed during operating condition for the rear portion of shielding piece shelters from the second air outlet, and the shielding piece is rotatory to be opened during the cleaning state, makes to form the clearance between the rear portion of shielding piece and the bottom inner wall of air-out groove.

When the box type low-noise kitchen special fan is in a working state, the pressure loss of blowing air from the air outlet groove can be reduced; when the box type low-noise kitchen special fan is in a cleaning state, the oil stain cleaning effect and speed can be improved.

Further technical scheme, shielding member possesses the front portion, and air outlet sealing member and soundproof box are along vertical direction straight line sliding connection, and shielding member's front portion is located air outlet sealing member's straight line sliding path.

When the working state becomes the cleaning state, the linkage of the air outlet sealing piece and the shielding piece can be realized, and the operation that the working state becomes the cleaning state is simpler and more convenient.

According to the further technical scheme, the rear portion of the shielding piece has a trend close to the inner wall of the bottom end of the air outlet groove.

The rear part of the shielding piece can be attached to the bottom end face of the air outlet groove in the working state, pressure loss in the working state can be reduced, and meanwhile the cleaning state is changed into the working state, and the operation is simple and convenient.

According to the technical scheme, the rear end of the shielding piece is provided with an attaching end, the bottom end face of the attaching end is attached to the inner wall of the bottom end of the air outlet groove in the working state, and/or the front end of the shielding piece is provided with a supported end, and the top end face of the supported end is perpendicular to the linear sliding path of the air outlet sealing piece and is located on the linear sliding path of the air outlet sealing piece in the working state.

This further technical scheme can further reduce the loss of pressure when operating condition, and/or, the gliding in-process of air outlet sealing member straight line, when air outlet sealing member was held the end and is offseted with being supported, the contact surface is great and be difficult to the card extremely, and the reliability is higher.

The technical scheme is further that the wind guide device comprises a pressurizing plate, the pressurizing plate is movably connected with the sound insulation box, in a cleaning state, the pressurizing plate and the bottom sealing plate are encircled to form a pressurizing space, and the wind guide outlet is located in the pressurizing space.

This further technical scheme can improve the speed of following the oil leak mouth oil discharge dirt.

In conclusion, the invention can achieve the following technical effects:

1. can guarantee that the air current reduces the swirl in the spiral plate, guarantee air-out pressure to when being convenient for make the sound-proof box, can guarantee the leakproofness of sound-proof box.

2. Can improve the oil stain removing effect and the oil stain removing speed.

3. The rear part of the shielding piece can be attached to the bottom end face of the air outlet groove in the working state, pressure loss in the working state can be reduced, and the cleaning state is changed into the working state, so that the operation is simple and convenient.

Drawings

Fig. 1 to 7 show a first embodiment; fig. 8 to 17 show a second embodiment; fig. 18 shows a third embodiment.

Fig. 1 is a perspective view of a box type low noise kitchen fan according to a first embodiment of the present invention.

Fig. 2 is a schematic exploded perspective view of a box-type low-noise kitchen fan according to a first embodiment of the present invention.

Fig. 3 is a perspective exploded view of another view of the box-type low noise kitchen fan according to the first embodiment of the present invention.

Fig. 4 is a perspective exploded view schematically showing another exploded state of the box type low noise kitchen fan according to the first embodiment of the present invention.

Fig. 5 is a perspective view of a bottom closure plate in accordance with a first embodiment of the present invention.

Fig. 6 is a perspective view of another perspective of the bottom sealing plate of the first embodiment of the present invention.

FIG. 7 is a schematic view of a wind impeller of a first embodiment of the invention, cut in half; LINE one LINE1 represents the plane in which the two impeller members meet each other.

Fig. 8 is a perspective view of a box type low noise kitchen fan according to a second embodiment of the present invention.

Fig. 9 is a perspective exploded view of a box type low noise kitchen fan according to a second embodiment of the present invention.

Fig. 10 is a half-cut schematic view of an air guide according to a second embodiment of the present invention.

Figure 11 is a schematic view, cut in half, of a second embodiment of a blanking member according to the invention.

Figure 12 is a schematic view, in half, of a bottom closure plate in accordance with a second embodiment of the present invention; the plugs are not shown.

Fig. 13 is a perspective view of the outlet vertical beam according to the second embodiment of the present invention.

Fig. 14 is a schematic top view of a box-type low-noise kitchen fan according to a second embodiment of the present invention.

FIG. 15 is a cross-sectional view taken along line A-A of FIG. 14; the box type low-noise kitchen special fan is in a working state; the arrow ARR1 indicates the path and direction of air flow within the outlet slot.

Fig. 16 is a partially enlarged view of a portion B in fig. 15; in the figure, the box type low-noise kitchen special fan is in a working state; arrow ARR1 indicates the air flow path and direction during the operating condition.

Fig. 17 is a partially enlarged view of a portion B in fig. 15; in the figure, the box type low-noise kitchen special fan is in a cleaning state; arrow two ARR2 indicates the direction of downward movement of the outlet seal to close the front outlet; arrow three ARR3 indicates the direction in which the outlet seal abuts against the abutted end so that the engaging end rotates to open; arrows four ARR4 indicate the air flow path and direction during the purge condition.

FIG. 18 is a schematic view of a third embodiment formed by adding a pressure increasing plate to that of FIG. 17; in the figure, the box type low-noise kitchen special fan is in a cleaning state; arrows four ARR4 indicate the air flow path and direction during the purge condition.

Arrow one ARR 1; arrow two ARR 2; arrow three ARR 3; arrow tetra ARR 4; LINE one LINE 1; a volute 1; a spiral plate 11; a volute side plate 12; an air collection port 121; a wind-collecting ring 122; an air outlet groove 13; a second air outlet 131; a volute mounting bracket 19; a wind impeller 2; a wind impeller shaft 21; a wind impeller member 22; a fan blade 221; a shaft coupling disk 222; a power assembly 3; a motor 31; a transmission 32; a transmission output wheel 33; a protective cover 39; a sound insulation box 4; a front closure plate 41; a front air outlet 411; a rear closure plate 42; a rear air inlet 421; side seal plates 43; a support plate 431; a side combination plate 432; a bearing 433; a waterproof box 434; a top closure plate 44; a bottom closure plate 45; an oil leak port 451; a plug 452; inclined surfaces 453; a horizontal surface 454; an air outlet flange 461; an air outlet vertical beam 463; a guide slot 464; an air outlet sealing member 5; an air guide member 6; an air guide inlet 61; a wind guide outlet 62; a shield 7; a fitting end 71; a held end 72; a hinge shaft 79; a pressure increasing plate 8; the plenum space 81.

Detailed Description

The following description will be made in conjunction with the accompanying drawings.

A first embodiment; please refer to fig. 1-7.

The box-type low-noise fan special for the kitchen of the first embodiment comprises a volute 1, a power assembly 3, a sound insulation box 4 and a fan wheel 2 provided with fan blades 221.

The volute 1 comprises a spiral plate 11 and volute side plates 12 fixed on two sides of the spiral plate 11.

The volute 1 is provided with an air outlet groove 13 communicated with the inner cavity of the spiral plate 11, and the inner wall of the bottom end of the air outlet groove 13 is tangent to the inner wall of the spiral plate 11. For example, a square frame (not shown in the drawings) is fixedly arranged on the outer side of the spiral plate 11, the inner wall of the bottom end of the square frame is tangent to the inner wall of the spiral plate 11, and an air outlet groove 13 is formed in the inner cavity of the square frame.

The volute side plate 12 is opened with an air collecting opening 121. The wind-collecting opening 121 is circular when viewed along the rotation axis of the wind-vane wheel 2, and the axis of the wind-collecting opening 121 coincides with the rotation axis of the wind-vane wheel 2. The wind collecting opening 121 is fixedly provided with a wind collecting ring 122, and the section of the wind collecting ring 122 (the section cut by a plane vertical to the rotation axis of the wind impeller 2) is reduced from outside to inside, so that the function of collecting air is achieved. For example, as shown in fig. 2 and 3, the wind-collecting ring 122 has a horn shape as one specific embodiment.

The wind impeller 2 is at least partly located within the spiral plate 11. The wind wheel 2 is wholly or partly located within the spiral plate 11 when viewed perpendicular to the rotational axis of the wind wheel 2.

The inner edge of the spiral plate 11 is spiral (spiral refers to a locus of moving points that rotates around a central point or axis and gradually moves away from the central point or axis, as will be seen from the relevant books) when viewed along the axis of rotation of the impeller 2. It should be noted that the spiral includes the logarithmic spiral and the archimedean spiral described in CN 102789646A.

The wind impeller 2 includes two wind impeller members 22 attached to each other, the blades 221 are disposed on the wind impeller members 22, and the two wind impeller members 22 attached to each other are mirror-symmetrical with respect to a plane (LINE 1 shown in fig. 7) where the two wind impeller members 22 are attached to each other. The left and right sides are universal when the wind impeller 2 is installed, the universality of the wind impeller 2 is high, and the stability in operation can be ensured so as to reduce vibration. The wind impeller 2 further comprises a wind impeller shaft 21; one end of each wind wheel component 22 is fixedly provided with a shaft connecting disc 222, and the wind wheel shaft 21 passes through the center of the shaft connecting disc 222 and is fixedly connected with the shaft connecting disc 222.

The sound-proof box 4 is provided with preceding air outlet 411 and back air inlet 421, spiral case 1 is fixed in sound-proof box 4, air collection opening 121 and sound-proof box 4's inner chamber intercommunication, air-out groove 13 and preceding air outlet 411 intercommunication, during the use, the air gets into (or inhales) the inner chamber of sound-proof box 4 from back air inlet 421, under the rotation of wind impeller 2, air collection opening 121 department forms the negative pressure and siphons away the air from sound-proof box 4's inner chamber, and the air blows out toward air-out groove 13 (also be preceding air outlet 411) under the effect of wind impeller 2, realize the function of fan. The front air outlet 411 is rectangular, and the cross section of the inner cavity of the air-out groove 13 (the cross section of the inner cavity is the cross section of the air-out groove 13 taken parallel to the plane of the front sealing plate 41) is rectangular as same as the front air outlet 411.

The volute side plate 12 is fixedly connected with a volute mounting bracket 19, and the volute mounting bracket 19 is fixedly connected with the inner wall of the sound insulation box 4, so that the volute 1 is fixed in the sound insulation box 4.

The power assembly 3 is in driving connection with the wind impeller 2. As one of the specific embodiments, the power assembly 3 includes a motor 31, a transmission 32, and a transmission output wheel 33; the transmission output wheel 33 is fixedly connected with the wind wheel shaft 21, and the rotation output end of the motor 31 is in driving connection with the transmission output wheel 33 through a transmission device 32, for example, the transmission device 32 is a belt, and the transmission output wheel 33 is a belt pulley; alternatively, the transmission 32 is a chain and the transmission output wheel 33 is a sprocket. The transmission 32 and the transmission output wheel 33 are both enclosed in a protective cover 39.

As will be readily understood from the above description, the power assembly 3 drives the wind wheel 2 to rotate, and after the air passes through the rear wind inlet 421 and the wind collecting opening 121 in sequence, the air is discharged from the front wind outlet 411 under the action of the wind wheel 2 to form a wind. Under the effect of the inward flange of spiral plate 11, can guarantee that the air current reduces the swirl in spiral plate 11, guarantee air-out pressure.

As shown in fig. 4, the soundproof box 4 includes a front sealing plate 41, a rear sealing plate 42, a top sealing plate 44, a bottom sealing plate 45, and two side sealing plates 43 which are riveted to each other to form a box-shaped structure, and the riveted connection means that, taking the front sealing plate 41 as an example, four sides of the front sealing plate 41 are respectively connected to the top sealing plate 44, the bottom sealing plate 45, and the two side sealing plates 43 by rivets. The mode that adjacent interplate adopts mutual riveting to connect not only is convenient for make sound-proof box 4, can ensure sound-proof box 4's leakproofness again, prevents that the connection gap between the board leaks the air. The front sealing plate 41, the rear sealing plate 42, the top sealing plate 44, the bottom sealing plate 45 and the two side sealing plates 43 are all galvanized plates to realize rust prevention.

The bottom sealing plate 45 is provided with an oil leakage port 451, the oil leakage port 451 is provided with a detachable plug 452, and the plug 452 seals the oil leakage port 451. For example, the plug 452 is screwed into the oil drain 451. The plug 452 is removed, so that oil stains accumulated on the bottom sealing plate 45 can be conveniently discharged.

The side sealing plate 43 includes a side combination plate 432 and a support plate 431 having a U-shaped cross section (the cross section is a cross section of the side combination plate 432 taken parallel to a plane of the bottom sealing plate 45), the side combination plate 432 is fixedly connected to a side edge (for example, one side or both sides) of the support plate 431 to form the side sealing plate 43, the support plate 431 is fixedly provided with a bearing 433, the wind impeller shaft 21 passes through the bearing 433, and a bottom end of the support plate 431 is fixedly connected to the bottom sealing plate 45. The U-shaped support plate 431 can provide a large load bearing force and improve reliability. Bearing 433 is a UKF bearing. For example, both ends of the wind wheel shaft 21 respectively pass through the wind collecting opening 121 and the support plate 431 and then are connected with the bearings 433, thereby realizing an E-type fan structure (in other words, the wind wheel 2 is between the two bearings 433, and the transmission output wheel 33 is in cantilever transmission). Of course, other fan configurations may be used, such as an a-fan configuration in which the rotational output of the motor is directly and coaxially fixedly connected to the fan shaft 21. The side sealing plate 43 is provided with a waterproof case 434 for waterproofing the bearing 433. Bearing 433 sets up in the outside of sound-proof box 4, and like this oil smoke or steam are difficult for touching bearing 433, increase bearing 433's life.

A second embodiment; please refer to fig. 8-17.

The second embodiment is different from the first embodiment in that the box-type low-noise kitchen dedicated fan further includes an air outlet sealing member 5 and an air guide member 6, the air outlet sealing member 5 is movably connected with the sound insulation box 4 to be able to close the front air outlet 411, for example, the air outlet sealing member 5 is linearly slidably connected or hinged with the sound insulation box 4, and the air outlet sealing member 5 completely covers the front air outlet 411 after linearly sliding or rotating, thereby closing the front air outlet 411; the spiral plate 11 is provided with a second air outlet 131 communicated with the air outlet groove 13; the air guide member 6 is provided with an air guide inlet 61 and an air guide outlet 62, as shown in fig. 15 and 16, the air guide inlet 61 is communicated with the second air outlet 131, the air guide outlet 62 faces the bottom sealing plate 45 and the oil leakage port 451, for example, the air guide outlet 62 is located on the front side of the bottom sealing plate 45, an included angle of an acute angle exists between the air blowing direction of the air guide outlet 62 and the bottom inner wall of the bottom sealing plate 45, and the air leakage port 451 faces the rear side of the bottom sealing plate 45. The air guide member 6 is fixedly connected to the spiral plate 11, but the air guide member 6 may be mounted on the scroll casing 1 or the soundproof case 4 only when the case type low noise kitchen fan is in a cleaning state. The air outlet sealing member 5 does not close the front air outlet 411, the front air outlet 411 is completely opened, at this time, the box-type low-noise kitchen special fan is in a working state, and air is blown out from the air outlet groove 13 to form air blowing. Although there may be some air flowing out from the second outlet 131, the air blowing from the air outlet slot 13 can still be formed; of course, this problem can also be solved by means provided later in this application. As shown in fig. 17, when the greasy dirt on the bottom sealing plate 45 needs to be cleaned, the air outlet sealing member 5 is moved to close the front air outlet 411, at this time, the special fan for the box-type low-noise kitchen is in a cleaning state, the air cannot pass through the front air outlet 411 and can only be blown out from the air guide outlet 62 after passing through the second air outlet 131, the air is blown out from the air guide outlet 62 to push the greasy dirt on the bottom sealing plate 45, so that the greasy dirt rapidly flows to the oil leakage port 451, and the greasy dirt removing effect and the greasy dirt removing speed can be improved.

As shown in fig. 16, the area (the projected area on the plane perpendicular to the air blowing direction) of the air guide outlet 62 is smaller than the area (the projected area on the plane perpendicular to the air blowing direction) of the air guide inlet 61, so that the air outlet speed of the air guide outlet 62 is increased, and the oil stain cleaning effect and speed are improved.

The special fan of box low noise kitchen of second embodiment, still include shielding piece 7, second air outlet 131 is seted up in the bottom inner wall of air-out groove 13, shielding piece 7 is articulated and can be rotatory around the horizontal axis with the lateral wall of air-out groove 13, shielding piece 7 is rotatory to be closed during operating condition, make shielding piece 7's rear portion shelter from second air outlet 131, shielding piece 7 is rotatory to be opened during the cleaning status, make and form the clearance between shielding piece 7's rear portion and the bottom inner wall of air-out groove 13, in order to relieve the sheltering from to second air outlet 131. Note that the front and rear portions of the shutter 7 are distinguished by the hinge shaft 79 of the shutter 7 as a boundary. It will be readily understood that the front part of the shield 7 is not essential and that it is also one of the embodiments that only the rear part of the shield 7 is provided. When the box-type low-noise kitchen fan is in an operating state, air flowing in the air outlet groove 13 cannot directly pass through the second air outlet 131, and pressure loss of air blowing from the air outlet groove 13 can be reduced. When the special fan of box low noise kitchen is the cleaning state, shielding piece 7 plays the wind-guiding effect for the pressure through second air outlet 131 is great, can improve greasy dirt clearance effect and speed.

As shown in fig. 16 and 17, the shield 7 includes a front portion, the outlet seal 5 and the soundproof box 4 are linearly slidably connected in the vertical direction, and the front portion of the shield 7 is positioned on a linear sliding path of the outlet seal 5. For example, an air outlet flange 461 is fixedly arranged at the front air outlet 411 of the sound insulation box 4, the air outlet flange 461 comprises an air outlet vertical beam 463, the air outlet vertical beam 463 is provided with a vertical guide slot 464, and the air outlet sealing member 5 is embedded into the guide slot 464, so that the air outlet sealing member 5 and the sound insulation box 4 are linearly and slidably connected in the vertical direction, it is easy to understand that, in order to realize abdicating, a top end cross beam (not shown in the drawing) of the air outlet flange 461 is provided with a strip-shaped through hole penetrating through the top end cross beam to abdicating the air outlet sealing member 5, although the strip-shaped through hole can cause slight pressure leakage, the influence is not large, and a rubber strip with low friction coefficient can be added for sealing; in addition, it is conceivable that the outlet seal 5 may be removed and the strip-shaped through hole may be sealed with a sealing tape or the like when the box-type low-noise kitchen fan is in an operating state.

When the box-type low-noise kitchen fan is changed from the working state to the cleaning state, the bottom end of the air outlet sealing member 5 abuts against the front portion of the shielding member 7 in the process that the air outlet sealing member 5 slides downwards to close the front air outlet 411, so that the rear portion of the shielding member 7 tilts, and a gap is formed between the rear portion of the shielding member 7 and the inner wall of the bottom end of the air outlet groove 13. As can be seen from the above, when the working state is changed into the cleaning state, the air outlet sealing member 5 and the shielding member 7 can be linked without operating the air outlet sealing member 5 and the shielding member 7 respectively, and the operation of changing the working state into the cleaning state is relatively simple.

As shown in fig. 16, the rear part of the shield 7 has a tendency to approach the inner wall of the bottom end of the air-out channel 13. For example, the weight of the front of the shield 7 is less than the weight of the rear of the shield 7, and the weight of the rear of the shield 7 tends to cause the rear of the shield 7 to approach the inner wall of the bottom end of the air outlet channel 13. For another example, the box-type low-noise fan dedicated for kitchens further includes a spring (not shown in the drawings), two ends of the spring are respectively hinged or fixedly connected with the rear portion of the shielding member 7 and the inner wall of the bottom end of the air outlet slot 13, and the spring provides a pulling force so that the rear portion of the shielding member 7 tends to be close to the inner wall of the bottom end of the air outlet slot 13. For another example, the box-type low-noise fan dedicated for kitchens further comprises a spring, wherein two ends of the spring are hinged or fixedly connected with the front part of the shielding piece 7 and the inner wall of the bottom end of the air outlet groove 13 respectively, and the spring provides repulsive force, so that the rear part of the shielding piece 7 tends to be close to the inner wall of the bottom end of the air outlet groove 13. The rear part of the shielding piece 7 can be attached to the inner wall of the bottom end of the air outlet groove 13 in the working state, and the pressure loss in the working state can be reduced. Meanwhile, when the cleaning state is changed into the working state, the air outlet sealing element 5 is moved upwards, the shielding element 7 is automatically reset, and the operation that the cleaning state is changed into the working state is simpler.

As shown in fig. 16, the rear end of the shielding member 7 is provided with a fitting end 71, and the bottom end face of the fitting end 71 is fitted with the bottom end inner wall of the air outlet groove 13 in the working state, so that the pressure loss in the working state can be further reduced; and/or the front end of the shielding piece 7 is provided with a supported end 72, and the top end surface of the supported end 72 is perpendicular to the linear sliding path of the air outlet sealing piece 5 and is positioned on the linear sliding path of the air outlet sealing piece 5 in the working state. In the process of linear sliding of the air outlet sealing member 5, when the air outlet sealing member 5 abuts against the abutted end 72, the contact surface between the air outlet sealing member 5 and the abutted end 72 is large (if the abutted end 72 is not provided, when the air outlet sealing member 5 directly contacts with the shielding member 7, only one ridge line is formed between the air outlet sealing member 5 and the shielding member 7, the contact surface is small), so that the air outlet sealing member is not easily clamped, and the reliability is high.

As shown in fig. 12, 15, and 17, the bottom seal plate 45 is provided with an inclined surface 453, the inclined surface 453 is gradually lowered from the front side of the bottom seal plate 45 toward the rear side of the bottom seal plate 45, the rear side of the bottom seal plate 45 is provided with a horizontal surface 454 flush with the bottom end of the inclined surface 453, and the oil drain port 451 is opened in the horizontal surface 454. The oil stain can automatically flow to the oil leakage opening 451 by the dead weight of the oil stain, and the speed of removing the oil stain is improved.

A third embodiment; please refer to fig. 18.

The third embodiment is different from the second embodiment in that, as shown in fig. 18, the box-type low-noise kitchen fan of the third embodiment further includes a pressure increasing plate 8, the pressure increasing plate 8 is movably connected to the soundproof box 4, for example, the pressure increasing plate 8 can be horizontally moved from the lower portion of the side sealing plate 43 and inserted into the soundproof box 4, or the pressure increasing plate 8 is detachably connected to or hinged to the soundproof box 4, when the box-type low-noise kitchen fan is in a cleaning state, the pressure increasing plate 8 and the bottom sealing plate 45 surround to form a pressure increasing space 81, and the air guide outlet 62 is located in the pressure increasing space 81. When the box-type low-noise kitchen fan is in a cleaning state, after the plug 452 is opened, air enters the plenum space 81 through the air guide outlet 62, so that the pressure in the plenum space 81 is increased, and the speed of discharging oil from the oil leakage port 451 can be increased.

As used in the present invention, the wording: first, second, etc. do not denote any order, quantity, or importance, but rather are used to distinguish one element from another.

As used in the present invention, the wording: one, etc. do not denote a limitation of quantity, but rather denote the presence of at least one of the referenced item.

As used in the present invention, the term indicating orientation or position: top, bottom, side, longitudinal, lateral, middle, center, outer, inner, horizontal, vertical, left, right, above, below, and the like are intended to reflect relative positions, not absolute positions.

The term as used in the present invention: approximate, whole, approximate, close, etc., are words of definition that specify the presence of stated features but allow for certain deviations. The amount of tolerance for a certain deviation may vary depending on the particular context; for example, the specific context in which deviations from size may be relied upon includes, but is not limited to, national standards for dimensional tolerances.

Claims

1. The box-type low-noise fan special for the kitchen comprises a volute (1), a power assembly (3), a sound insulation box (4) and a fan wheel (2) provided with fan blades (221); the volute (1) comprises a spiral plate (11) and volute side plates (12) fixed on two sides of the spiral plate (11); the volute (1) is provided with an air outlet groove (13) communicated with the inner cavity of the spiral plate (11), and the inner wall of the bottom end of the air outlet groove (13) is tangent to the inner wall of the spiral plate (11); an air collecting opening (121) is formed in the volute side plate (12); the wind impeller (2) is at least partially positioned in the spiral plate (11); when viewed along the rotating axis of the wind impeller (2), the inner edge of the spiral plate (11) is spiral; the sound insulation box (4) is provided with a front air outlet (411) and a rear air inlet (421), the volute (1) is fixed in the sound insulation box (4), the air collecting port (121) is communicated with the inner cavity of the sound insulation box (4), and the air outlet groove (13) is communicated with the front air outlet (411); the power assembly (3) is in driving connection with the wind impeller (2); the sound insulation box (4) comprises a bottom sealing plate (45) provided with an oil leakage opening (451), and is characterized by further comprising an air outlet sealing piece (5) and an air guide piece (6), wherein the air outlet sealing piece (5) is movably connected with the sound insulation box (4) and can close a front air outlet (411), and the spiral plate (11) is provided with a second air outlet (131) communicated with the air outlet groove (13); the air guide piece (6) is provided with an air guide inlet (61) and an air guide outlet (62), the air guide inlet (61) is communicated with the second air outlet (131), and the air guide outlet (62) faces the bottom sealing plate (45) and the oil leakage opening (451);

still include shielding piece (7), the bottom inner wall in air-out groove (13) is seted up in second air outlet (131), shielding piece (7) are articulated and can be rotatory around the horizontal axis with the lateral wall in air-out groove (13), shielding piece (7) are rotatory to be closed during operating condition for the rear portion of shielding piece (7) shelters from second air outlet (131), shielding piece (7) are rotatory to be opened during the cleaning condition, make and form the clearance between the rear portion of shielding piece (7) and the bottom inner wall in air-out groove (13).

2. The fan for low-noise box type kitchen according to claim 1, wherein the soundproof box (4) further comprises a front sealing plate (41), a rear sealing plate (42), a top sealing plate (44), and two side sealing plates (43), and the front sealing plate (41), the rear sealing plate (42), the top sealing plate (44), a bottom sealing plate (45), and the two side sealing plates (43) are riveted to each other to form a box-shaped structure.

3. The box-type low-noise kitchen special fan as claimed in claim 2, wherein the oil leakage opening (451) is provided with a detachable plug (452), and the plug (452) seals the oil leakage opening (451).

4. The special fan for the box-type low-noise kitchen according to claim 2, wherein the fan wheel (2) further comprises a fan wheel shaft (21), the side sealing plate (43) comprises a side combination plate (432) and a supporting plate (431) with a U-shaped cross section, the side combination plate (432) is fixedly connected with the side edge of the supporting plate (431) to form the side sealing plate (43), the supporting plate (431) is fixedly provided with a bearing (433), the fan wheel shaft (21) penetrates through the bearing (433), the bottom end of the supporting plate (431) is fixedly connected with the bottom sealing plate (45), and the bearing (433) is positioned outside the sound insulation box (4).

5. The box-type low-noise special fan for the kitchen according to claim 2, wherein the fan wheel (2) comprises two fan wheel components (22) which are attached to each other, the fan blades (221) are arranged on the fan wheel components (22), and the two fan wheel components (22) which are attached to each other are mirror-symmetrical about the plane where the two fan wheel components (22) are attached to each other.

6. The special box-type low-noise fan for kitchens as claimed in claim 1, wherein the shielding member (7) is provided with a front portion, the air outlet sealing member (5) is linearly slidably connected with the soundproof box (4) along a vertical direction, and the front portion of the shielding member (7) is located on a linear sliding path of the air outlet sealing member (5).

7. A low noise, box-like kitchen fan according to claim 6, characterized in that the rear part of the shield (7) has a tendency to approach the inner wall of the bottom end of the air outlet channel (13).

8. The box-type low-noise fan special for kitchens as claimed in claim 7, wherein the rear end of the shielding member (7) is provided with an attaching end (71), the bottom end surface of the attaching end (71) is attached to the inner wall of the bottom end of the air outlet groove (13) in the working state, and/or the front end of the shielding member (7) is provided with a supported end (72), and the top end surface of the supported end (72) is perpendicular to the linear sliding path of the air outlet sealing member (5) and is located on the linear sliding path of the air outlet sealing member (5) in the working state.

9. The special box-type low-noise fan for kitchens as claimed in claim 1, further comprising a pressure increasing plate (8), wherein the pressure increasing plate (8) is movably connected with the sound insulation box (4), when in a cleaning state, the pressure increasing plate (8) and the bottom sealing plate (45) surround to form a pressure increasing space (81), and the air guide outlet (62) is positioned in the pressure increasing space (81).