Duct connection and kitchen appliance

Abstract

This invention relates to the field of kitchen appliance technology, and more particularly to a duct connector and a kitchen appliance. The duct connector includes an annular shell, an upper ring body, multiple outer clamping pieces, a lower ring body, and multiple inner clamping pieces. A fixing ring is coaxially fixed inside the annular shell. The upper ring body is positioned above the fixing ring. The multiple outer clamping pieces are movably clamped between the upper ring body and the fixing ring along the circumference of the annular shell. The upper ring body can rotate circumferentially to drive the outer clamping pieces to move radially, thus forming a variable-diameter outer ring. The lower ring body is rotatably positioned below the fixing ring. The multiple inner clamping pieces are movably clamped between the lower ring body and the fixing ring along the circumference of the annular shell. The lower ring body can rotate circumferentially to drive the inner clamping pieces to move radially, thus forming a variable-diameter inner ring, which is coaxially positioned within the variable-diameter outer ring. The kitchen appliance includes the aforementioned duct connector. The air outlet hood is connected and installed with ducts of different sizes through the duct connector, improving the versatility of the kitchen appliance.

Description

Technical Field

[0001] This invention relates to the field of kitchen appliance technology, and more particularly to a duct connector and a kitchen appliance. Background Technology

[0002] In residential homes, when kitchen ventilation is required, the exhaust hood on the integrated cooktop is typically connected to a shared exhaust pipe via ductwork or directly vents the fumes outdoors. The exhaust hood's adapter is usually designed in a conical shape to facilitate connection and installation with the ductwork, allowing for a smooth transition between the two. However, because the conical adapter for the exhaust hood comes in a single size, it is difficult to accommodate the assembly requirements of ducts with different diameters. Summary of the Invention

[0003] The purpose of this invention is to provide a duct connector and a kitchen appliance to solve the problem of the limited assembly size of the air outlet cover and duct in the prior art.

[0004] To achieve this objective, the technical solution adopted by the present invention is as follows:

[0005] Duct fittings, including:

[0006] An annular shell, wherein a fixing ring is coaxially fixedly disposed inside the annular shell;

[0007] The upper ring body and multiple outer clamping pieces are arranged above the fixed ring. The multiple outer clamping pieces are movably clamped between the upper ring body and the fixed ring along the circumference of the annular shell. The upper ring body can rotate circumferentially to drive the outer clamping pieces to move radially, so that the multiple outer clamping pieces form a variable diameter outer ring.

[0008] The lower ring body and multiple inner clamping pieces are rotatably disposed below the fixed ring. The multiple inner clamping pieces are movably clamped between the lower ring body and the fixed ring along the circumference of the annular shell. The lower ring body can rotate circumferentially to drive the inner clamping pieces to move radially, so that the multiple inner clamping pieces surround to form a variable diameter inner ring, and the variable diameter inner ring is coaxially disposed inside the variable diameter outer ring.

[0009] As a preferred embodiment, the outer clamping piece includes a connected outer base plate and an outer fin plate, the outer base plate being movably clamped between the upper ring body and the fixed ring, and a plurality of the outer fin plates surrounding to form the variable diameter outer ring;

[0010] The inner clamping piece includes a connected inner base plate and an inner fin plate. The inner base plate is movably clamped between the lower ring body and the fixed ring, and a plurality of the inner fin plates surround to form the variable diameter inner ring.

[0011] As a preferred embodiment, an outer guide block is provided on the upper end face of the outer substrate, and an outer guide post is provided on the lower end face of the outer substrate. The upper ring body is provided with a plurality of first guide grooves extending radially at an inclination, and the fixed ring is provided with a plurality of second guide grooves extending radially at an inclination. The first guide grooves are inclined in a counterclockwise direction, and the second guide grooves are inclined in a clockwise direction. The outer guide block is slidably engaged with the first guide groove, and the outer guide post is slidably engaged with the second guide groove. The upper ring body rotates counterclockwise to drive the outer fin to move radially inward, and the diameter of the variable-diameter outer ring decreases.

[0012] As a preferred embodiment, the upper end face of the inner substrate is provided with an inner guide post, the lower end face of the inner substrate is provided with an inner guide block, the lower ring body is provided with a plurality of third guide grooves extending radially at an inclination, and the fixed ring is provided with a plurality of fourth guide grooves extending radially at an inclination. The third guide grooves are inclined in a counterclockwise direction, and the fourth guide grooves are inclined in a clockwise direction. The inner guide block is slidably engaged with the third guide groove, and the inner guide post is slidably engaged with the fourth guide groove. The lower ring body rotates clockwise to drive the inner fin plate to move radially outward, and the diameter of the variable-diameter inner ring increases.

[0013] As a preferred embodiment, the annular shell has an upper sliding groove and a lower sliding groove extending circumferentially through its peripheral sidewall.

[0014] The upper ring body has an upper lever protruding from its outer periphery. The upper lever passes through the upper sliding groove and can rotate along the upper sliding groove. The lower ring body has a lower lever protruding from its outer periphery. The lower lever passes through the lower sliding groove and can rotate along the lower sliding groove.

[0015] As a preferred embodiment, the upper end of the upper lever is provided with a first locking block, and the upper ring body is locked to the annular shell by the first locking block;

[0016] The lower end of the lower lever is provided with a second locking block, and the lower ring body is locked to the annular shell by the second locking block.

[0017] As a preferred embodiment, the duct connector further includes a locking rod, the first locking block having a first locking hole, and one of the locking rods being movably inserted into the first locking hole to abut or release the annular shell;

[0018] The second locking block has a second locking hole, and another locking rod is movably inserted into the second locking hole to press against or release the annular shell.

[0019] As a preferred embodiment, the variable diameter outer ring and the variable diameter inner ring can jointly clamp the air outlet pipe, and the contact parts between the air pipe and the top of the variable diameter outer ring and the top of the variable diameter inner ring are respectively provided with sealant.

[0020] The kitchen appliance includes an exhaust hood and the aforementioned duct connector, wherein the exhaust hood is installed in connection with the duct via the duct connector.

[0021] The beneficial effects of this invention are as follows:

[0022] The duct connector proposed in this invention features a variable-diameter outer ring formed by multiple outer clamping pieces within an annular shell, and a variable-diameter inner ring formed by multiple inner clamping pieces, with the inner ring coaxially positioned inside the outer ring. When ducts of different sizes are fitted between the outer and inner rings, the diameter of the inner ring is adjusted by rotating the lower ring to support the inner wall of the duct, while the diameter of the outer ring is adjusted by rotating the upper ring to clamp the duct together. The duct connector allows for connection and installation with ducts of different sizes, improving the versatility of the duct connector.

[0023] The kitchen appliance proposed in this invention includes an exhaust hood and the aforementioned duct connector. The exhaust hood can be connected and installed with ducts of different sizes through the duct connector, thereby improving the versatility of the kitchen appliance. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the assembly structure of the duct connector and the air outlet hood provided in an embodiment of the present invention;

[0025] Figure 2 This is an exploded view of the internal structure of the annular shell provided in an embodiment of the present invention;

[0026] Figure 3 This is a schematic diagram of the structure of the outer clip provided in an embodiment of the present invention. Figure 1 ;

[0027] Figure 4 This is a schematic diagram of the structure of the outer clip provided in an embodiment of the present invention. Figure 2 ;

[0028] Figure 5 This is a schematic diagram of the structure of the inner clip provided in an embodiment of the present invention;

[0029] Figure 6 yes Figure 1 A magnified view of a portion of point A in the middle.

[0030] The component names and labels in the diagram are as follows:

[0031] 100. Air vent cover;

[0032] 1. Annular shell; 11. Fixing ring; 111. Second guide groove; 112. Fourth guide groove; 12. Upper sliding groove; 13. Lower sliding groove;

[0033] 2. Upper ring body; 21. First guide groove; 22. Upper lever; 23. First locking block; 231. First locking hole;

[0034] 3. Outer clamping plate; 30. Variable diameter outer ring; 31. Outer base plate; 32. Outer fin plate; 33. Outer guide block; 34. Outer guide post;

[0035] 4. Lower ring body; 41. Third guide groove; 42. Lower lever; 43. Second locking block; 5. Inner clamping plate; 50. Variable diameter inner ring; 51. Inner base plate; 52. Inner fin plate; 53. Inner guide block; 54. Inner guide post. Detailed Implementation

[0036] To make the technical problems solved by the present invention, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely for explaining the present invention and are not intended to limit the present invention. Furthermore, it should be noted that, for ease of description, only the parts related to the present invention are shown in the accompanying drawings, not all of them.

[0037] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0038] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0039] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0040] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0041] This embodiment proposes a kitchen appliance, which can be an integrated stove, a range hood, or other kitchen appliances requiring ventilation. The kitchen appliance includes an exhaust hood, which is connected to the air duct via a conical adapter to facilitate transitional installation between the two. However, because the conical adapter of the exhaust hood has a single size, it is difficult to meet the assembly requirements of air ducts with different diameters.

[0042] To solve the above problems, such as Figure 1 and Figure 2 As shown, this embodiment also proposes a duct connector, through which the air outlet hood 100 is connected and installed to the duct. The duct connector includes an annular shell 1, an upper ring body 2, multiple outer clamping pieces 3, a lower ring body 4, and multiple inner clamping pieces 5. A fixing ring 11 is coaxially fixed inside the annular shell 1. The upper ring body 2 is disposed above the fixing ring 11. The multiple outer clamping pieces 3 are movably clamped between the upper ring body 2 and the fixing ring 11 along the circumference of the annular shell 1. The upper ring body 2 can rotate circumferentially to drive the outer clamping pieces 3 to move radially, so that the multiple outer clamping pieces 3 surround a variable diameter outer ring 30. The lower ring body 4 is rotatably disposed below the fixing ring 11. The multiple inner clamping pieces 5 are movably clamped between the lower ring body 4 and the fixing ring 11 along the circumference of the annular shell 1. The lower ring body 4 can rotate circumferentially to drive the inner clamping pieces 5 to move radially, so that the multiple inner clamping pieces 5 surround a variable diameter inner ring 50, and the variable diameter inner ring 50 is coaxially disposed inside the variable diameter outer ring 30.

[0043] When the annular shell 1 is fixedly installed on the conical adapter of the air outlet hood 100 of the kitchen appliance, the inner diameter reducing ring 50 is coaxially arranged inside the outer diameter reducing ring 30 within the annular shell 1. When air ducts of different sizes are fitted between the outer diameter reducing ring 30 and the inner diameter reducing ring 50, the diameter of the inner diameter reducing ring 50 is adjusted by rotating the lower ring body 4 to support the inner wall of the air duct, and the diameter of the outer diameter reducing ring 30 is adjusted by rotating the upper ring body 2 so that the outer diameter reducing ring 30 and the inner diameter reducing ring 50 together clamp the air duct. The air outlet hood 100 can be connected and installed with air ducts of different sizes through the air duct connector, improving the versatility of the air duct connector. At the same time, the air duct is clamped by the outer diameter reducing ring 30 and the inner diameter reducing ring 50 together, improving the sealing between the air duct connector and the air duct.

[0044] Furthermore, the outer diameter reducing ring 30 and the inner diameter reducing ring 50 can together clamp the air outlet duct, and sealant can be applied to the contact points between the duct and the top of the outer diameter reducing ring 30 and the top of the inner diameter reducing ring 50. By sealing the gaps between the outer diameter reducing ring 30, the duct, and the inner diameter reducing ring 50 with sealant, the sealing between the duct joint and the duct is further improved.

[0045] like Figure 2 and Figure 3 As shown, the outer clamping piece 3 includes a connected outer base plate 31 and an outer fin plate 32. The outer base plate 31 is movably clamped between the upper ring body 2 and the fixed ring 11, and multiple outer fin plates 32 surround to form a variable diameter outer ring 30. The inner clamping piece 5 includes a connected inner base plate 51 and an inner fin plate 52. The inner base plate 51 is movably clamped between the lower ring body 4 and the fixed ring 11, and multiple inner fin plates 52 surround to form a variable diameter inner ring 50.

[0046] Specifically, both the outer fin 32 and the inner fin 52 are roughly strip-shaped. When multiple outer clamping plates 3 are arranged circumferentially, the outer fins 32 of the multiple outer clamping plates 3 together form a regular polygon. The more outer clamping plates 3 there are, the smaller the side length of the regular polygon formed by the outer clamping plates 3, and the closer the variable diameter outer ring 30 is to a circle. Similarly, the more inner clamping plates 5 there are, the smaller the side length of the regular polygon formed by the inner fins 52, making the variable diameter inner ring 50 closer to a circle, thereby allowing the variable diameter outer ring 30 and the variable diameter inner ring 50 to fit and clamp tightly with the air duct respectively.

[0047] like Figures 2-4 As shown, an outer guide block 33 is provided on the upper end surface of the outer substrate 31, and an outer guide post 34 is provided on the lower end surface of the outer substrate 31. The upper ring body 2 has multiple first guide grooves 21 extending radially at an incline, and the fixing ring 11 has multiple second guide grooves 111 extending radially at an incline. The first guide grooves 21 are inclined counterclockwise, and the second guide grooves 111 are inclined clockwise. The outer guide block 33 slides with the first guide grooves 21, and the outer guide post 34 slides with the second guide grooves 111. The aforementioned counterclockwise direction is... Figure 2 The direction indicated by the middle arrow is clockwise. Figure 2 The opposite direction to the direction indicated by the middle arrow.

[0048] When the duct joint is in its initial state (without duct installed), the outer guide block 33 is located at the outermost end of the first guide groove 21, and the outer guide post 34 is located at the outermost end of the second guide groove 111. When the upper ring body 2 rotates counterclockwise, it drives the outer guide block 33 to slide inward within the first guide groove 21, while the outer guide post 34 slides inward within the second guide groove 111, thereby driving the outer fin 32 to move radially inward, and the diameter of the variable-diameter outer ring 30 decreases. Conversely, when the upper ring body 2 rotates clockwise, it drives the outer guide block 33 to slide outward within the first guide groove 21, while the outer guide post 34 slides outward within the second guide groove 111, thereby driving the outer fin 32 to move radially outward, and the diameter of the variable-diameter outer ring 30 increases.

[0049] like Figure 2 and Figure 5 As shown, an inner guide post 54 is provided on the upper end surface of the inner substrate 51, and an inner guide block 53 is provided on the lower end surface of the inner substrate 51. Multiple third guide grooves 41 extending radially are provided on the lower ring body 4, and multiple fourth guide grooves 112 extending radially are provided on the fixing ring 11. The third guide grooves 41 are inclined counterclockwise, and the fourth guide grooves 112 are inclined clockwise. The inner guide block 53 is slidably engaged with the third guide grooves 41, and the inner guide post 54 is slidably engaged with the fourth guide grooves 112.

[0050] In the initial state of the duct joint, the inner guide block 53 is located at the inner end of the third guide groove 41, and the inner guide post 54 is located at the inner end of the fourth guide groove 112. When the lower ring body 4 rotates clockwise, the inner guide block 53 slides outward in the third guide groove 41, while the inner guide post 54 slides outward in the fourth guide groove 112, driving the inner fin 52 to move radially outward, thus increasing the diameter of the variable-diameter inner ring 50. Conversely, when the lower ring body 4 rotates counterclockwise, the inner guide block 53 slides inward in the third guide groove 41, while the inner guide post 54 slides inward in the fourth guide groove 112, driving the inner fin 52 to move radially inward, thus decreasing the diameter of the variable-diameter inner ring 50.

[0051] In this embodiment, both the first guide groove 21 and the third guide groove 41 are inclined counterclockwise, and their inclination angles are different. Both the second guide groove 111 and the fourth guide groove 112 are inclined clockwise, and their inclination angles are different. The inclination angles, inclination directions, and distribution positions of the first guide groove 21, the second guide groove 111, the third guide groove 41, and the fourth guide groove 112 can be flexibly adjusted according to design requirements, as long as the diameter-changing process of the inner ring 50 and the outer ring 30 can be achieved; no specific limitations are imposed here.

[0052] When the duct is fitted between the inner reducing ring 50 and the outer reducing ring 30, the lower ring 4 rotates clockwise, increasing the diameter of the inner reducing ring 50 and supporting it against the inner wall of the duct. The upper ring 2 rotates counterclockwise, decreasing the diameter of the outer reducing ring 30 and supporting it against the outer wall of the duct, so that the inner reducing ring 50 and the outer reducing ring 30 together clamp the duct, achieving a secure installation of the duct joint and the duct.

[0053] like Figure 1 and Figure 6 As shown, the annular shell 1 has an upper sliding groove 12 and a lower sliding groove 13 extending circumferentially through its peripheral sidewall. An upper lever 22 protrudes from the outer periphery of the upper ring body 2, extending through the upper sliding groove 12 and rotating along it. A lower lever 42 protrudes from the outer periphery of the lower ring body 4, extending through the lower sliding groove 13 and rotating along it. By providing the upper lever 22 and the lower lever 42, it is convenient for assembly personnel to manually operate them, enabling rapid rotation of the upper ring body 2 and the lower ring body 4, thereby improving the assembly efficiency of the duct joint.

[0054] like Figure 1 and Figure 6 As shown, the upper end of the upper lever 22 is provided with a first locking block 23, and the upper ring 2 is locked to the annular shell 1 by the first locking block 23. The lower end of the lower lever 42 is provided with a second locking block 43, and the lower ring 4 is locked to the annular shell 1 by the second locking block 43. After the duct connector and the duct are assembled, the first locking block 23 locks the upper ring 2, and the second locking block 43 locks the lower ring 4, thereby stably clamping and fixing the duct between the variable diameter outer ring 30 and the variable diameter inner ring 50, improving the stability and reliability of the duct connector.

[0055] Specifically, the duct connector also includes a locking rod. The first locking block 23 has a first locking hole 231, and a locking rod is movably inserted into the first locking hole 231 to tighten or loosen the annular shell 1. The second locking block 43 has a second locking hole, and another locking rod is movably inserted into the second locking hole to tighten or loosen the annular shell 1. In this embodiment, both the first locking hole 231 and the second locking hole are threaded holes, and the locking rod is a bolt. When the upper ring 2 and the lower ring 4 are rotated into position, one bolt is threadedly connected to the first locking hole 231 and abuts against the outer circumferential surface of the annular shell 1, and the other bolt is threadedly connected to the second locking hole and abuts against the outer circumferential surface of the annular shell 1, thereby locking the upper ring 2 and the lower ring 4 onto the annular shell 1 respectively. In other embodiments, the locking rod can also be a pin.

[0056] In this embodiment, the kitchen appliance, through the aforementioned duct connector, allows the exhaust hood 100 to be connected and installed with ducts of different sizes, improving the versatility of the kitchen appliance. Simultaneously, the variable-diameter outer ring 30 and the variable-diameter inner ring 50 together clamp the duct, improving the sealing performance of the kitchen appliance.

[0057] The above embodiments merely illustrate the basic principles and characteristics of the present invention. The present invention is not limited to the above embodiments. Various changes and modifications can be made to the present invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A duct connector, characterized in that, include: An annular shell (1), wherein a fixing ring (11) is coaxially fixed inside the annular shell (1); The upper ring body (2) and multiple outer clamping pieces (3) are arranged above the fixed ring (11). The multiple outer clamping pieces (3) are movably clamped between the upper ring body (2) and the fixed ring (11) along the circumference of the annular shell (1). The upper ring body (2) can rotate circumferentially to drive the outer clamping pieces (3) to move radially, so that the multiple outer clamping pieces (3) surround a variable diameter outer ring (30). The lower ring body (4) and a plurality of inner clamping pieces (5) are rotatably disposed below the fixed ring (11). The plurality of inner clamping pieces (5) are movably clamped between the lower ring body (4) and the fixed ring (11) along the circumferential direction of the annular shell (1). The lower ring body (4) can rotate circumferentially to drive the inner clamping pieces (5) to move radially, so that the plurality of inner clamping pieces (5) surround to form a variable diameter inner ring (50), and the variable diameter inner ring (50) is coaxially disposed inside the variable diameter outer ring (30). The outer clamp (3) includes an outer base plate (31) and an outer wing plate (32) connected together. The outer base plate (31) is movably clamped between the upper ring body (2) and the fixed ring (11). A plurality of outer wing plates (32) surround to form the variable diameter outer ring (30). The inner clamp (5) includes a connected inner base plate (51) and an inner wing plate (52). The inner base plate (51) is movably clamped between the lower ring body (4) and the fixed ring (11). A plurality of inner wing plates (52) surround to form the variable diameter inner ring (50). The upper end face of the outer substrate (31) is provided with an outer guide block (33), and the lower end face of the outer substrate (31) is provided with an outer guide post (34). The upper ring body (2) is provided with a plurality of first guide grooves (21) extending radially at an inclination. The fixed ring (11) is provided with a plurality of second guide grooves (111) extending radially at an inclination. The first guide grooves (21) are inclined in a counterclockwise direction, and the second guide grooves (111) are inclined in a clockwise direction. The outer guide block (33) is slidably engaged with the first guide groove (21), and the outer guide post (34) is slidably engaged with the second guide groove (111). The upper ring body (2) rotates counterclockwise to drive the outer fin plate (32) to move radially inward, and the diameter of the variable diameter outer ring (30) becomes smaller. The upper end face of the inner substrate (51) is provided with an inner guide post (54), and the lower end face of the inner substrate (51) is provided with an inner guide block (53). The lower ring body (4) is provided with a plurality of third guide grooves (41) extending radially inclined. The fixed ring (11) is provided with a plurality of fourth guide grooves (112) extending radially inclined. The third guide grooves (41) are inclined in the counterclockwise direction, and the fourth guide grooves (112) are inclined in the clockwise direction. The inner guide block (53) is slidably engaged with the third guide groove (41), and the inner guide post (54) is slidably engaged with the fourth guide groove (112). The lower ring body (4) rotates clockwise to drive the inner fin plate (52) to move radially outward, and the diameter of the variable diameter inner ring (50) increases.

2. The duct connector according to claim 1, characterized in that, The annular shell (1) has an upper sliding groove (12) and a lower sliding groove (13) extending along its circumference through its peripheral sidewall. The upper ring body (2) has an upper lever (22) protruding from its outer periphery. The upper lever (22) passes through the upper sliding groove (12) and can rotate along the upper sliding groove (12). The lower ring body (4) has a lower lever (42) protruding from its outer periphery. The lower lever (42) passes through the lower sliding groove (13) and can rotate along the lower sliding groove (13).

3. The duct connector according to claim 2, characterized in that, The upper end of the upper lever (22) is provided with a first locking block (23), and the upper ring body (2) is locked to the annular shell (1) by the first locking block (23); The lower end of the lower lever (42) is provided with a second locking block (43), and the lower ring body (4) is locked to the annular shell (1) by the second locking block (43).

4. The duct connector according to claim 3, characterized in that, The duct connector also includes a locking rod. The first locking block (23) has a first locking hole (231). One of the locking rods is movably inserted into the first locking hole (231) to abut or release the annular shell (1). The second locking block (43) has a second locking hole, and another locking rod is movably inserted into the second locking hole to press against or loosen the annular shell (1).

5. The duct connector according to any one of claims 1 to 4, characterized in that, The variable diameter outer ring (30) and the variable diameter inner ring (50) can clamp the air outlet pipe together, and the contact parts between the air outlet pipe and the top of the variable diameter outer ring (30) and the top of the variable diameter inner ring (50) are respectively provided with sealant.

6. A kitchen appliance, characterized in that, It includes an air outlet hood (100) and a duct connector according to any one of claims 1 to 5, wherein the air outlet hood (100) is installed in communication with the duct via the duct connector.

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