Air bellow assembly and range hood with air bellow assembly

Abstract

The air bellow assembly comprises an inner air bellow, an air inlet is formed in a bottom plate of the inner air bellow, an air outlet is formed in a top plate of the inner air bellow, the part, located on the left side of the air outlet, of the top plate inclines downwards from right to left, and the part, located on the right side of the air outlet, of the top plate inclines downwards from left to right; turnups are arranged on the front side edge and the rear side edge of the air inlet, and an included angle of 45 degrees is formed between the turnups and the bottom plate. Compared with the prior art, the parts, located on the two sides of the air outlet, of the air bellow assembly flow upwards and collide with the wall faces of the parts, located on the two sides of the air outlet, of the top plate, then flow downwards along the wall faces of the corresponding sides, then spiral airflow is formed, flows upwards, and is guided by the turned edges after flowing through the turned edges of the corresponding sides; the two strands of spiral airflow form an air path between the turnups on the two sides of the air inlet, airflow entering through the air inlet cannot be prevented from directly flowing to the air inlet side of the smoke exhaust fan through the air outlet, and noise can be lowered.

Description

Technical Field

[0001] The utility model relates to the technical field of range hoods, and in particular to a bellows assembly and a range hood having the same. Background Art

[0002] For a top-suction range hood, the air intake port is arranged on the top of the range hood body, and the inner bellows is installed in the installation cavity of the range hood body. The thickness of the inner bellows is relatively small. When the air intake port is a narrow and long air intake port, the width of the air intake port is much smaller than the width of the air outlet of the inner bellows. In this way, when the external airflow enters the inner bellows through the narrow and long air intake port, the airflow enters from the air intake port and hits the top of the air intake cavity and is divided into two streams, front and back. The two airflows spiral toward the smoke exhaust fan located in the middle, which will disturb the airflow flowing directly to the air inlet of the smoke exhaust fan through the air intake port, and generate greater noise in the smoke collecting cavity of the inner bellows. Utility Model Content

[0003] The purpose of the utility model is to provide a bellows assembly and a range hood having the same, which are used to solve the above-mentioned technical problems.

[0004] A bellows assembly for a range hood comprises an inner bellows, an air inlet is arranged on the bottom plate of the inner bellows, an air outlet is arranged on the top plate of the inner bellows, the portion of the top plate located on the left side of the air outlet is tilted downward from right to left, and the portion of the top plate located on the right side of the air outlet is tilted downward from left to right, so that the thickness of the air collecting cavity of the inner bellows located on the left and right sides of the air outlet gradually decreases from close to the air outlet to far away from the air outlet; flanges are arranged on the front and rear edges of the air inlet, the projection of the flanges falls into the air inlet, and the flanges form an angle of 45° with the bottom plate.

[0005] According to one embodiment of the utility model, a connecting portion connecting the front and rear sides of the air inlet is provided on the left and right sides, and the portion where the connecting portion is connected to the flange on the corresponding side adopts an arc transition, and the connecting portion forms a 45° angle with the bottom plate.

[0006] According to one embodiment of the utility model, the front plate of the inner bellows is tilted backward from top to bottom, and the rear plate of the inner bellows, at least the lower part thereof, is tilted forward from top to bottom, and the flange and the connecting part form an oil baffle arranged around the air inlet.

[0007] According to one embodiment of the utility model, an oil leakage hole is provided on the bottom plate of the inner bellows at the rear side of the air inlet, and the bottom plate is tilted downward from front to back, with a slope smaller than that of the front plate. The oil at the flange on the front side of the air inlet flows to both sides of the flange and is guided to the rear side of the air inlet through the connecting parts on both sides.

[0008] According to one embodiment of the utility model, it also includes an outer bellows, which is connected to the top of the inner bellows and communicated with the inner bellows through an air outlet. A smoke exhaust fan is provided in the outer bellows, and the smoke exhaust fan is arranged to be inclined forward from top to bottom, with its suction side facing the back plate of the outer bellows, and the air inlet is located on the rear side of the lower edge of the smoke exhaust fan.

[0009] According to one embodiment of the utility model, an oil collecting pan is provided at the air outlet of the inner bellows, the oil collecting pan is located below the smoke exhaust fan, an oil drain hole is provided at the bottom of the volute of the smoke exhaust fan, the oil drain hole is aligned with the oil collecting pan, the oil collecting pan extends to both sides of the air inlet, and oil drain ports located outside the air inlet are provided on both sides of the oil collecting pan.

[0010] According to one embodiment of the utility model, it also includes an oil guide groove, which is connected to the lower surface of the top plate of the inner bellows, and is tilted downward from front to back. The oil drain port is aligned with the oil guide groove, and the oil outlet end of the oil guide groove extends to the rear side of the air inlet.

[0011] A range hood adopts the above-mentioned bellows assembly, including a range hood body, the range hood body having an installation cavity, an inner bellows installed in the installation cavity, the range hood body also having an air suction panel, the air suction panel is provided with an air suction port, the air suction panel is connected to the bottom plate of the inner bellows, and the air inlet is arranged around the air suction port.

[0012] According to one embodiment of the utility model, wind and liquid guiding parts are provided on both sides of the air suction port, a guide groove is formed between the flange and the wind and liquid guiding parts located on the same side of the air inlet, and a liquid guiding hole is provided on the flange located on the rear side of the air inlet.

[0013] According to an embodiment of the utility model, a liquid guiding groove is provided on the wind and liquid guiding member, and the liquid guiding groove is communicated with the guide groove.

[0014] Compared with the prior art, the bellows assembly of the utility model has the following advantages:

[0015] After the bellows assembly of the utility model is applied to the range hood, when the range hood is working, the external airflow enters the inner bellows through the air inlet. After the external airflow enters the inner bellows through the air inlet, a part of it flows directly to the air inlet side of the smoke exhaust fan of the range hood through the air inlet, and the parts located on both sides of the air outlet flow upward and collide with the wall surface of the part of the top plate located on both sides of the air outlet, then flow downward along the wall surface of the corresponding side and then form a spiral airflow and then flow upward, and after flowing through the flange on the corresponding side, it is guided by the flange so that the two spiral airflows form an air path between the flanges on both sides of the air inlet, which will not block the airflow entering through the air inlet from flowing directly to the air inlet side of the smoke exhaust fan through the air outlet, and can also reduce noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of an inner bellows of a bellows assembly of the utility model;

[0017] Figure 2 is a cross-sectional view of the inner bellows;

[0018] Figure 3 It is a structural schematic diagram of a range hood having a bellows assembly of the utility model;

[0019] Figure 4 It is a schematic structural diagram of a range hood having a bellows assembly of the utility model with the cover plate and the back plate of the outer bellows removed;

[0020] Figure 5 It is a cross-sectional view of a range hood having the bellows assembly of the utility model;

[0021] Figure 6 for Figure 5 A magnified view of middle;

[0022] In the figure: 1. inner bellows, 11. bottom plate, 111. air inlet, 112. flange, 1121. liquid guide hole, 113. connection part, 114. oil leakage hole, 115. guide groove, 12. top plate, 121. air outlet, 13. front plate, 14. rear plate, 2. outer bellows, 3. smoke exhaust fan, 4. oil receiving tray, 41. air guide hole, 5. oil guide groove, 6. smoke machine body, 61. air suction panel, 611. air suction port, 7. air guide and liquid guide part, 71. liquid guide groove

[0023] The realization of the functions and advantages of the utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0024] The following will disclose multiple embodiments of the present invention with drawings. For the purpose of clear description, many practical details will be described together in the following description. However, it should be understood that these practical details should not be used to limit the present invention. In other words, in some embodiments of the present invention, these practical details are not necessary. In addition, in order to simplify the drawings, some conventional structures and components will be depicted in a simple schematic manner in the drawings.

[0025] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0026] In addition, in the present utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes, and do not specifically refer to the order or sequence, nor are they used to limit the present utility model. They are only used to distinguish components or operations described with the same technical terms, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0027] In order to further understand the content, features and effects of the present invention, the following embodiments are given as examples and described in detail with reference to the accompanying drawings:

[0028] See also Figure 1 and Figure 2 The utility model discloses a bellows assembly, which is used for a range hood, and comprises an inner bellows 1, an air inlet 111 is provided on a bottom plate 11 of the inner bellows 1, an air outlet 121 is provided on a top plate 12 of the inner bellows 1, a portion of the top plate 12 located on the left side of the air outlet 121 is tilted downward from right to left, and a portion of the top plate 12 located on the right side of the air outlet 121 is tilted downward from left to right, so that the thickness of the portion of the air collecting cavity of the inner bellows located on the left and right sides of the air outlet 121 gradually decreases from close to the air outlet 121 to far away from the air outlet 121; a flange 112 is provided on the front and rear edges of the air inlet 111, a projection of the flange 112 falls into the air inlet 111, and the flange 112 forms an angle of 45° with the bottom plate 11. After the bellows assembly of the utility model is applied to the range hood, when the range hood is working, the external airflow enters the inner bellows 1 through the air inlet 111. After the external airflow enters the inner bellows 1 through the air inlet 111, a part of it flows directly to the air inlet side of the smoke exhaust fan of the range hood through the air inlet 111, and the parts located on both sides of the air outlet 121 flow upward and collide with the wall surface of the part of the top plate 12 located on both sides of the air outlet 121, then flow downward along the wall surface of the corresponding side and then form a spiral airflow and then flow upward, and after flowing through the flange 112 on the corresponding side, it is guided by the flange 112, so that the two spiral airflows form an air path between the flanges 112 on both sides of the air inlet 111, which will not block the airflow entering through the air inlet 111 from flowing directly to the air inlet side of the smoke exhaust fan through the air outlet 121, and can also reduce noise.

[0029] In the bellows assembly of the utility model, a connecting portion 113 is provided on the left and right sides of the air inlet 111 to connect the flanges 112 on the front and rear sides thereof, and the portion where the connecting portion 113 is connected to the flanges 112 on the corresponding side adopts an arc transition, and the connecting portion 113 forms a 45° angle with the bottom plate 11. The flanges 112 and the connecting portion 113 form an oil retaining portion arranged around the air inlet 111, and the oil on the inner wall surface of the inner bellows 1 will flow downward, and then gather on the bottom plate 11 of the inner bellows 1, and the oil gathered on the bottom plate 11 of the inner bellows 1 is blocked by the oil retaining portion and cannot flow from the air inlet 111 to the outside of the inner bellows 1.

[0030] See also Figure 1 and Figure 2 In the bellows assembly of the utility model, the front plate 13 of the inner bellows 1 is tilted backward from top to bottom, and at least the lower portion of the rear plate 14 of the inner bellows 1 is tilted forward from top to bottom. The flange 112 and the connecting portion 113 form an oil retaining portion arranged around the air inlet 111. After the bellows assembly of the utility model is applied to the range hood, when the smoke exhaust fan of the range hood is working, the oil smoke enters the inner bellows 1 through the air inlet 111 and is then discharged by the smoke exhaust fan of the range hood. When the oil smoke passes through the inner bellows 1, the oil liquid formed by the mixture of oil and water in the oil smoke will adhere to the wall surface of the inner bellows 1. After long-term use, the oil and water mixture adhered to the wall surface of the inner bellows 1 will flow downward along the wall surface of the inner bellows 1. The front plate 13 of the inner bellows 1 is tilted backward from top to bottom, and the oil liquid thereon flows downward along the front plate 13 and drips onto the bottom plate 11 of the inner bellows 1. The oil on the rear plate 14 drips downward onto the inclined portion thereof, then flows downward along the inclined portion thereof and drips onto the bottom plate 11 of the inner bellows 1, and the oil on the portion of the bottom plate 11 located in front of the air inlet 111 flows downward along the bottom plate 11, and then is blocked by the flange 112 at the flange 112 on the front side of the air inlet 111, which can avoid flowing over the air inlet 111 to the outside of the air inlet 111, and the blocked oil flows to both sides of the flange 112 at the bottom of the flange 112 on the corresponding side, and is guided by the connecting portion 113 to flow to the rear side of the air inlet 111. In the bellows assembly of the utility model, an oil leakage hole 114 is provided on the portion of the bottom plate 11 of the inner bellows 1 located at the rear side of the air inlet 111. The bottom plate 11 is tilted downward from front to back, and its inclination is smaller than the inclination of the front plate 13. The oil at the flange on the front side of the air inlet 111 flows to both sides of the flange and is guided to the rear side of the air inlet 111 through the connecting parts 113 on both sides, and then discharged through the oil leakage hole 114.

[0031] See also Figure 3 and Figure 4The bellows assembly of the utility model also includes an outer bellows 2, which is connected to the top of the inner bellows 1 and communicated with the inner bellows 1 through the air outlet 121. A smoke exhaust fan 3 is arranged in the outer bellows 2, which is tilted forward from top to bottom, with its air suction side facing the back plate of the outer bellows 2, and the air inlet 111 is located at the rear side of the lower edge of the smoke exhaust fan 3. The smoke exhaust fan 3 is tilted forward from top to bottom in the outer bellows 2, so that the air inlet side of the smoke exhaust fan 3 can be closer to the air outlet 121 of the inner bellows 1, which can improve the suction force of the smoke exhaust fan 3 on the oil smoke; after the bellows assembly is applied to the range hood, when the range hood is started, the smoke exhaust fan 3 is running, and the smoke exhaust fan 3 sucks the gas in the inner bellows 1 and discharges it to the outside, forming a negative pressure in the smoke exhaust fan 3. Under the action of the negative pressure, the external airflow enters the inner bellows 1 through the air inlet 111, and part of the smoke exhaust fan 3 is sucked out. The partial airflow directly enters the outer wind box 2 through the air outlet 121, and rushes into the air inlet side of the smoke exhaust fan 3 between the rear plate of the outer wind box 2 and the smoke exhaust fan 3. Another part of the airflow collides with the top plate 12 on the corresponding side when flowing toward the air outlet 121, and then flows back along the top plate 12 to form a spiral airflow that rises. When passing through the flange 112, it is guided by the flange 112 to flow toward the air outlet 121, and flows into the outer wind box 2 through the air outlet 121, and then is discharged by the smoke exhaust fan 3.

[0032] See also Figure 4 and Figure 5 In the bellows assembly of the utility model, an oil receiving pan 4 is provided at the air outlet 121 of the inner bellows 1, and the oil receiving pan 4 is located below the smoke exhaust fan 3. An oil drain hole is provided at the bottom of the volute of the smoke exhaust fan 3, and the oil drain hole is aligned with the oil receiving pan 4. The oil receiving pan 4 extends to both sides of the air inlet 111, and oil drain ports located outside the air inlet 111 are provided on both sides of the oil receiving pan 4. The bellows assembly of the utility model, when applied to the range hood, the inner bellows 1 is installed in the installation of the range hood body, and the range hood body is provided with an air suction port connected with the air inlet 111. When the range hood is started, the smoke exhaust fan 3 runs, and the oil smoke generated by the user's cooking enters the air collecting chamber of the inner bellows 1 through the air inlet 111 connected with the air suction port, then flows to the air inlet side of the smoke exhaust fan 3, and is discharged by the smoke exhaust fan 3; after the operation of the smoke exhaust fan 3 is finished, the oil on the volute of the smoke exhaust fan 3 is discharged downwardly through the oil discharge hole at the bottom of the volute, and then is received by the oil receiving pan 4, flows along the oil receiving pan 4, and is finally discharged through the oil outlets on both sides of the oil receiving pan 4. Since the oil collecting pan 4 is provided, the oil discharged from the volute of the smoke exhaust fan 3 will not be directly discharged onto the bottom plate 11 of the inner bellows 1, so that when the distance between the bottom of the volute of the smoke exhaust fan 3 and the bottom plate 11 of the inner bellows 1 is too high, the oil splashing can be avoided, which not only causes noise but also has the risk of splashing out of the inner bellows 1 through the air inlet 111.

[0033] See also Figure 4 and Figure 5In the bellows assembly of the utility model, the oil receiving pan 4 is arranged in the air collecting chamber in a downwardly inclined manner from front to back, the downward projection of the oil receiving pan 4 is located in front of the air inlet 111, and the parts of the oil receiving pan 4 located on both sides of the smoke exhaust fan 3 are provided with air guide holes 41. When the range hood is started, the smoke exhaust fan 3 is running, and the oil smoke generated by the user's cooking enters the air collecting chamber of the inner bellows 1 through the air inlet 111 connected to the air suction port of the range hood body, and then flows to the air inlet side of the smoke exhaust fan 3. When flowing to the air inlet side of the smoke exhaust fan 3, since the oil receiving pan 4 is arranged below the smoke exhaust fan 3 and the air guide holes 41 are arranged on the oil receiving pan 4, in the flue part of the air collecting chamber blocked by the oil receiving pan 4, the oil smoke flows to the top of the oil receiving pan 4 through the air guide holes 41 on the oil receiving pan 4, and then flows to the air inlet side of the smoke exhaust fan 3. After the smoke exhaust fan 3 stops running, the oil in the volute is discharged through the oil drain hole at the bottom of the volute and is received by the oil receiving pan 4, then flows along the oil receiving pan 4, and is finally discharged through the oil outlets on both sides of the oil receiving pan 4. Since the downward projection of the oil receiving pan 4 is located in front of the air inlet 111, the oil receiving pan 4 will not directly block the flow path of the oil smoke entering the air collecting chamber through the air inlet 111.

[0034] See also Figure 4 and Figure 5 The bellows assembly of the utility model also includes an oil guide groove 5, which is connected to the lower surface of the top plate 12 of the inner bellows 1, and is tilted downward from front to back. The oil discharge port is aligned with the oil guide groove 5, and the oil outlet end of the oil guide groove 5 extends to the rear side of the air inlet 111. The oil on the volute of the smoke exhaust fan 3 flows out through the oil discharge hole at the bottom of the volute and drips onto the oil receiving pan 4, then flows from front to back along the bottom surface of the oil receiving pan 4, and then gathers at the rear end of the oil receiving pan 4, and finally is discharged into the oil guide groove 5 through the oil outlets on both sides of the rear end of the oil receiving pan 4, flows along the oil guide groove 5 and is finally discharged through the oil outlet end of the oil guide groove 5. In the bellows assembly of the utility model, the oil outlet end of the oil guide groove 5 is located at the rear side of the air inlet 111, and the oil on the volute of the smoke exhaust fan 3 is finally discharged to the bottom of the inner bellows 1 located at the rear side of the air inlet 111. The bottom of the inner bellows 1 is also provided with an oil leakage hole 114, and the oil discharged by the oil guide groove 5 to the bottom of the inner bellows 1 located at the rear side of the air inlet 111 is discharged from the air collecting cavity through the oil leakage hole 114. In actual application, the oil guide groove 5 is tilted downward from front to back, so that the oil outlet end of the oil guide groove 5 is as close to the bottom of the bellows body 1 as possible, and when the oil is discharged through the oil guide groove 5, it is prevented from splashing and splashing to the outside of the air collecting cavity through the air inlet 111.

[0035] See also Figures 3 to 5The utility model also discloses a range hood, which adopts the above-mentioned bellows assembly. The range hood disclosed in the utility model includes a range hood body 6, which has an installation cavity, in which an inner bellows 1 is installed. The range hood body 6 also has an air suction panel 61, on which an air suction port 611 is provided. The air suction panel 61 is connected to the bottom plate 11 of the inner bellows 1, and the air inlet 111 is arranged around the air suction port 611. The hood disclosed in the utility model is a top suction hood. The air suction panel 61 of the hood is the top plate of the hood. An air suction port 611 connected to the air collecting chamber through the air inlet 111 is provided on the air suction panel 61 of the hood. When the hood is started, the smoke exhaust fan 3 is in operation, and the oil smoke generated by the user's cooking enters the air collecting chamber through the air inlet 111 connected to the air suction port 611. After the external oil smoke enters the inner wind box 1 through the air inlet 111, a part of it flows directly to the air inlet side of the smoke exhaust fan 3 through the air inlet 111, and the part located on both sides of the air outlet 121 flows upward. After colliding with the wall surface of the top plate 12 on both sides of the air outlet 121, it flows downward along the wall surface on the corresponding side, forms a spiral airflow and then flows upward. After flowing through the flange 112 on the corresponding side, it is guided by the flange 112 and flows toward the air inlet side of the smoke exhaust fan 3. At the same time, due to the guidance of the flange 112, two spiral airflows form an air path between the flanges 112 on both sides of the air inlet 111, which will not block the airflow entering through the air inlet 111 from flowing directly through the air outlet 121 to the air inlet side of the smoke exhaust fan 3, and can also reduce noise.

[0036] See also Figure 5 and Figure 6 In the smoke exhaust fan of the present invention, wind and liquid guiding parts 7 are provided on both sides of the air inlet 611, and a guide groove 115 is formed between the flange 112 and the wind and liquid guiding parts 7 located on the same side of the air inlet 111, and a liquid guiding hole 1121 is provided on the flange 112 located at the rear side of the air inlet 111. When the oil smoke passes through the air inlet 611, it is guided by the wind and liquid guiding parts 7, and then flows to the air inlet side of the smoke exhaust fan 3, and the projection of the wind and liquid guiding parts 7 to the bottom of the inner bellows 1 is located outside the air inlet 611, so that the oil liquid accumulated on the wind and liquid guiding parts 7 will drip into the guide groove 115, and the guide groove 115 is connected with the part of the bottom plate of the inner bellows 1 located at the rear side of the air inlet 111 through the liquid guiding hole 1121, and flows to the part of the bottom plate of the inner bellows 1 located at the rear side of the air inlet 111 through the liquid guiding hole 1121, and then discharged from the inner bellows 1 through the oil leakage hole 114.

[0037] See also Figure 5 and Figure 6In the range hood of the utility model, a liquid guiding groove 71 is provided on the air guiding and liquid guiding member 7, and the liquid guiding groove 71 is connected with the guide groove 115. The air guiding and liquid guiding member 7 includes a liquid guiding surface and a liquid guiding groove 71 located below the liquid guiding surface. The liquid guiding surface on each side is inclined from bottom to top in a direction away from the air inlet 611, and the downward projection of the lower edge of the liquid guiding surface falls into the liquid guiding groove 71. When the oil smoke passes through the liquid guiding surface, the oil liquid formed by the mixture of oil and water in the oil smoke will adhere to the liquid guiding surface and accumulate on the liquid guiding surface. When a certain amount of oil is accumulated, it will flow along the liquid guiding surface and drip into the liquid guiding groove 71 near the lower edge of the liquid guiding surface, and then enter the guide groove 115 through the liquid guiding groove 71. The oil liquid in the guide groove 115 flows through the liquid guiding hole 1121 to the bottom plate of the inner bellows 1 located at the rear side of the air inlet 111, and then is discharged from the inner bellows 1 through the oil leakage hole 114. This can prevent the oil on the liquid guide surface from dripping to the outside of the range hood through the air suction port 611.

[0038] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions or improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A bellows assembly for a range hood, characterized in that: The invention comprises an inner bellows (1), wherein an air inlet (111) is provided on a bottom plate (11) of the inner bellows (1), and an air outlet (121) is provided on a top plate (12) of the inner bellows (1); a portion of the top plate (12) located on the left side of the air outlet (121) is tilted downward from right to left, and a portion of the top plate (12) located on the right side of the air outlet (121) is tilted downward from left to right, so that the thickness of the portion of the air collecting cavity of the inner bellows located on the left and right sides of the air outlet (121) gradually decreases from close to the air outlet (121) to far away from the air outlet (121); a flange (112) is provided on the front edge and the rear edge of the air inlet (111), the projection of the flange (112) falls into the air inlet (111), and the flange (112) forms an angle of 45° with the bottom plate (11).

2. The bellows assembly according to claim 1, characterized in that: The left and right sides of the air inlet (111) are provided with connecting parts (113) connecting the flanges (112) on the front and rear sides thereof, and the portion where the connecting part (113) is connected to the flanges (112) on the corresponding side adopts an arc surface transition, and the connecting part (113) forms an angle of 45° with the bottom plate (11).

3. The bellows assembly according to claim 2, characterized in that: The front plate (13) of the inner bellows (1) is arranged to tilt backward from top to bottom, and at least the lower portion of the rear plate (14) of the inner bellows (1) is arranged to tilt forward from top to bottom, and the flange (112) and the connecting portion (113) form an oil retaining portion arranged around the air inlet (111).

4. The bellows assembly according to claim 3, characterized in that: An oil leakage hole (114) is provided on the bottom plate (11) of the inner bellows (1) at a portion located at the rear side of the air inlet (111); the bottom plate (11) is tilted downward from front to rear, and its tilt is smaller than the tilt of the front plate (13); the oil at the flange on the front side of the air inlet (111) flows toward both sides of the flange and is guided to the rear side of the air inlet (111) through the connecting portions (113) on both sides.

5. The bellows assembly according to claim 1, characterized in that: The invention also comprises an outer wind box (2), wherein the outer wind box (2) is connected to the upper part of the inner wind box (1) and is in communication with the inner wind box (1) through the air outlet (121); a smoke exhaust fan (3) is arranged inside the outer wind box (2); the smoke exhaust fan (3) is arranged to be inclined forward from top to bottom, with its air suction side facing the back plate of the outer wind box (2); and the air inlet (111) is located at the rear side of the lower edge of the smoke exhaust fan (3).

6. The bellows assembly according to claim 5, characterized in that: An oil receiving pan (4) is provided at the air outlet (121) of the inner bellows (1), the oil receiving pan (4) is located below the smoke exhaust fan (3), an oil drain hole is provided at the bottom of the volute of the smoke exhaust fan (3), the oil drain hole is aligned with the oil receiving pan (4), the oil receiving pan (4) extends to both sides of the air inlet (111), and oil drain holes are provided on both sides of the oil receiving pan (4) and are located outside the air inlet (111).

7. The bellows assembly according to claim 6, characterized in that: It also includes an oil guide groove (5), which is connected to the lower surface of the top plate (12) of the inner bellows (1) and is arranged to be tilted downward from front to back. The oil discharge port is aligned with the oil guide groove (5), and the oil outlet end of the oil guide groove (5) extends to the rear side of the air inlet (111).

8. A range hood, using the bellows assembly according to any one of claims 1 to 7, characterized in that: The range hood body (6) comprises a range hood body (6), the range hood body (6) having an installation cavity, the inner bellows (1) being installed in the installation cavity, the range hood body (6) further comprising an air suction panel (61), the air suction panel (61) being provided with an air suction port (611), the air suction panel (61) being connected to a bottom plate (11) of the inner bellows (1), and the air inlet (111) being arranged around the air suction port (611).

9. The range hood according to claim 8, characterized in that: Wind and liquid guiding parts (7) are provided on both sides of the air inlet (611); a guide groove (115) is formed between the flange (112) and the wind and liquid guiding part (7) located on the same side of the air inlet (111); and a liquid guiding hole (1121) is provided on the flange (112) located on the rear side of the air inlet (111).

10. The range hood according to claim 9, characterized in that: The air and liquid guiding member (7) is provided with a liquid guiding groove (71), and the liquid guiding groove (71) is connected to the guide groove (115).

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