Range hood and air pipe seat for exhausting oil smoke

Abstract

The utility model provides an improved range hood and an air pipe seat for exhausting oil smoke. The utility model provides an air pipe seat for exhausting oil smoke. The air pipe seat comprises an exhaust pipe body and a buckle piece, the first valve plate is provided with a rotating shaft; the second valve plate is provided with a rotating shaft; the exhaust pipe body is provided with a supporting seat; the exhaust pipe body is further provided with a first insertion hole and a second insertion hole which are opposite to the supporting seat; one end of a rotating shaft of the first valve plate is inserted into the first insertion hole, and the other end of the rotating shaft is lapped on the supporting seat; one end of a rotating shaft of the second valve plate is inserted into the second insertion hole, and the other end is put on the supporting seat; when the other end of the rotating shaft of the first valve plate is put on the supporting seat and the other end of the rotating shaft of the second valve plate is put on the supporting seat, the buckling piece is clamped to the supporting seat, and the other end of the rotating shaft of the first valve plate and the other end of the rotating shaft of the second valve plate are both arranged on the supporting seat based on the limiting effect of the buckling piece. Therefore, the first valve plate and the second valve plate are easy and convenient to install and operate.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of range hood.

BACKGROUND

[0002] In the Asian region, due to the traditional cooking habit of stir-frying, the oil content in the smoke generated during cooking is particularly high. Therefore, the range hood for extracting the oil smoke generated during cooking has become an important household appliance indispensable to daily life. With the continuous improvement of people's requirements for the quality of life, the range hood is also constantly upgrading.

[0003] The existing range hood is generally provided with a duct seat. A rotatable valve plate is arranged in the duct seat to control the opening and closing of the air duct. When installing the valve plate, the valve plate will undergo a certain elastic deformation so that the rotating shaft of the valve plate can be inserted into the corresponding assembly hole of the duct seat. However, during the installation of the valve plate, improper operation and other reasons can easily cause the valve plate to deform excessively, so that the elastic deformation of the rotating shaft of the valve plate inserted into the assembly hole of the duct seat cannot be completely restored after the installation, affecting the function realization of the valve plate and requiring replacement. This not only affects the manufacturing efficiency, but also increases the manufacturing cost.

[0004] Unless sufficient evidence is provided, the prior art described herein does not mean that these prior art is admitted to be known to those skilled in the art related to the present application before the filing date of the present application.

SUMMARY

[0005] One purpose of the embodiments of the present application is to propose an improved range hood and a duct seat for extracting oil smoke in order to solve at least one of the above technical problems and / or other possible technical problems not mentioned in the present application.

[0006] According to a first aspect of the present application, embodiments of the present application provide a duct base for discharging oil fume, comprising an exhaust pipe body and a buckle; further comprising a first valve piece provided with a rotating shaft and a second valve piece provided with a rotating shaft; the first valve piece and the second valve piece are both semicircular and are adapted to rotate around the rotating shaft to open or close the airflow passage of the exhaust pipe body; when the airflow passage of the exhaust pipe body is closed, the first valve piece and the second valve piece are spliced together to form a whole circle; the exhaust pipe body is provided with a support seat; the exhaust pipe body is further provided with a first insertion hole and a second insertion hole which are oppositely arranged with the support seat; one end of the rotating shaft of the first valve piece is inserted into the first insertion hole and the other end is placed on the support seat; one end of the rotating shaft of the second valve piece is inserted into the second insertion hole and the other end is placed on the support seat; when the other end of the rotating shaft of the first valve piece and the other end of the rotating shaft of the second valve piece are placed on the support seat, the buckle is buckled on the support seat, and the other end of the rotating shaft of the first valve piece and the other end of the rotating shaft of the second valve piece are arranged on the support seat based on the limiting action of the buckle. Thus, when assembling the first valve piece and the second valve piece, the first valve piece and the second valve piece do not elastically deform, there is no risk of excessive deformation of the first valve piece and the second valve piece, and the installation operation of the first valve piece and the second valve piece is simple.

[0007] In one or some embodiments, the buckle comprises an elastically deformable buckling part; the buckling part is arranged to be adapted to elastically deform to be buckled on the support seat. Thus, when the buckling part is buckled on the support seat, the operation is simple.

[0008] In one or some embodiments, the support seat comprises a first convex edge and a second convex edge arranged opposite to each other; the buckling part comprises a first clamping hook and a second clamping hook arranged opposite to each other; when the buckle is buckled on the support seat, the first clamping hook is clamped on the first convex edge and the second clamping hook is clamped on the second convex edge. Thus, when the buckling part is buckled on the support seat, the operation is simple.

[0009] In one or some embodiments, the buckle is provided with a first stopper and a second stopper; when the buckle is buckled on the support seat, the first stopper is adapted to resist the end of the other end of the rotating shaft of the first valve piece to make one end of the rotating shaft of the first valve piece not to be separated from the first insertion hole, and the second stopper is adapted to resist the end of the other end of the rotating shaft of the second valve piece to make one end of the rotating shaft of the second valve piece not to be separated from the second insertion hole.

[0010] In one or some embodiments, the first stopper and the second stopper are spaced apart to form a plug-in notch; the support base is provided with a plug-in protrusion; when the buckle is buckled to the support base, the plug-in protrusion is inserted into the plug-in notch. Thus, when the buckle is buckled to the support base, the buckle and the support base are fixed firmly.

[0011] In one or some embodiments, the inner wall of the exhaust pipe body is provided with a first support protrusion and a second support protrusion; the first support protrusion is arranged to support the first valve plate when the first valve plate closes the airflow passage of the exhaust pipe body; the second support protrusion is arranged to support the second valve plate when the second valve plate closes the airflow passage of the exhaust pipe body; the cross-sectional area of the first support protrusion increases in a streamline manner along the airflow direction in the airflow passage; the cross-sectional area of the second support protrusion increases in a streamline manner along the airflow direction in the airflow passage.

[0012] In one or some embodiments, the rotating shaft of the first valve plate is integrally formed on the first valve plate; the rotating shaft of the second valve plate is integrally formed on the second valve plate.

[0013] In one or some embodiments, when the buckle is buckled to the support base, the buckle and the support base are spaced apart to form a third insertion hole and a fourth insertion hole; the other end of the rotating shaft of the first valve plate is inserted into the third insertion hole; the other end of the rotating shaft of the second valve plate is inserted into the fourth insertion hole.

[0014] In one or some embodiments, the first valve plate and the second valve plate have the same structure and can be replaced with each other; and / or

[0015] The buckle is integrally formed.

[0016] The first valve plate and the second valve plate have the same structure and can be replaced with each other; thus, the first valve plate and the second valve plate are suitable for being manufactured by the same set of molds, and the manufacturing cost is low.

[0017] In one or some embodiments, the exhaust pipe body is provided with an outer pipe wall around the exhaust pipe port; the outer pipe wall and the exhaust pipe port of the exhaust pipe body are spaced apart to form a circular groove suitable for embedding the air inlet pipe head of the smoke exhaust pipe; the support base is arranged at the groove bottom of the circular groove; the exhaust pipe port of the exhaust pipe body is provided with a notch, and the support base is arranged at the notch.

[0018] In one or some embodiments, the gap is arranged such that before one end of the rotating shaft of the first valve plate is inserted into the first insertion hole, the plate body of the first valve plate is adapted to be partially inserted into the annular groove through the gap, so that the first valve plate does not deform when being assembled; the gap is arranged such that before one end of the rotating shaft of the second valve plate is inserted into the second insertion hole, the plate body of the second valve plate is adapted to be partially inserted into the annular groove through the gap, so that the second valve plate does not deform when being assembled.

[0019] According to a second aspect of the present application, embodiments of the present application provide an extractor hood, comprising a body and the duct seat as claimed in any one of the above; a top wall of the body is provided with an exhaust hole; the duct seat is connected to the exhaust hole.

[0020] It should be noted here that the directional expressions such as "top wall", "bottom end", "upward", "downward" appearing in the present application are based on the normal use state of the extractor hood, unless otherwise specified.

[0021] It should be noted here that the "first", "second", "third", "fourth" appearing in the specification are only for descriptive purposes and do not indicate relative importance; moreover, they are not a limitation on the number of features defined thereby; in addition, they are also not a limitation on the logical relationship or order relationship of the features defined thereby.

[0022] The above technical solution content of the present application is not used to describe all possible embodiments of the present application. Throughout the application, examples are provided by listing to guide, which can be used in various feasible combinations. BRIEF DESCRIPTION OF DRAWINGS

[0023] The following drawings only schematically illustrate and explain the present application and do not limit the scope of the present application, in which:

[0024] Figure 1 is a structural schematic view of an embodiment of the duct seat for discharging oil fume of the present application;

[0025] Figure 2 is Figure 1 is another structural schematic view of an embodiment of the duct seat for discharging oil fume;

[0026] Figure 3 is Figure 2 is an enlarged view of the local structure at A in FIG. 8;

[0027] Figure 4 is Figure 1 is still another structural schematic view of an embodiment of the duct seat for discharging oil fume;

[0028] Figure 5 is Figure 4 is an enlarged view of the local structure at B in FIG. 6;

[0029] Figure 6 is Figure 1 is an assembly process schematic view of the second valve piece of the first valve piece of the duct seat embodiment for discharging oil fume shown in FIG. 7;

[0030] Figure 7 is Figure 1 is another assembly process schematic view of the second valve piece of the first valve piece of the duct seat embodiment for discharging oil fume shown in FIG. 8;

[0031] Figure 8 is Figure 1 is another structure schematic view of the duct seat embodiment for discharging oil fume shown in FIG. 9;

[0032] Figure 9 is still another structure schematic view of the duct seat embodiment for discharging oil fume shown in FIG. 10; Figure 1

[0033] is a sectional view along the line D-D in FIG. 11; Figure 10 Figure 9 is

[0034] is an enlarged view of the local structure at G in FIG. 12; Figure 11 Figure 10 is a sectional view along the line E-E in FIG. 13;

[0035] Figure 12 Figure 9 is

[0036] Figure 13 is an enlarged view of the local structure at F in FIG. 14; Figure 12

[0037] is a structure schematic view of the first valve piece of the duct seat embodiment for discharging oil fume according to the present application; Figure 14

[0038] is a structure schematic view of the buckle piece of the duct seat embodiment for discharging oil fume according to the present application; Figure 15

[0039] is another structure schematic view of the buckle piece of the duct seat embodiment for discharging oil fume according to the present application. Figure 16 Reference signs:

[0040]

[0041] ​​​1 - first valve piece, 2 - second valve piece, 3 - rotation shaft, 4 - exhaust pipe body, 5 - air flow channel, 6 - flange edge, 7 - first insertion hole, 8 - second insertion hole, 9 - oil leakage hole, 10 - support seat, 11 - first convex edge, 12 - second convex edge, 13 - circular annular groove, 14 - notch, 15 - screw hole, 16 - buckle, 17 - body part, 18 - interval convex point, 19 - first clamping hook, 20 - second clamping hook, 21 - first stopper, 22 - second stopper, 23 - insertion slot, 24 - inverted T-shaped support, 25 - first guide surface, 26 - second guide surface, 27 - interval convex plate, 28 - first limiting convex part, 29 - second limiting convex part, 30 - insertion convex part, 31 - first support convex point, 32 - second support convex point. DETAILED DESCRIPTION

[0042] In order to make the technical problems, technical solutions and beneficial technical effects of the present application more clear, the present application will be further described in detail below in combination with the drawings and multiple exemplary embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, but not to limit the protection scope of the present application, and each embodiment can share the same view or multiple views described, but all the features appearing in the same view should not be interpreted as the features that an embodiment must have. On the contrary, they can be combined in any suitable way as long as they are not technically incompatible. Moreover, for the sake of brevity, different aspects of different embodiments can be presented in the same specific design, but such presentation does not mean that the embodiments of these aspects should appear together. The disassembly and / or combination of all possible embodiments and / or technical features should also consider the description in the specification and what can be directly and unambiguously determined by those skilled in the art based on the description in the specification.

[0043] An embodiment of the present application for the exhaust pipe seat for discharging oil fume is provided, which comprises an exhaust pipe body 4, a buckle 16, a first valve piece 1 provided with a rotation shaft 3 and a second valve piece 2 provided with a rotation shaft 3, as shown in Figures 1 to 13 The bottom end of the exhaust pipe body 4 is provided with a square flange edge 6. In other words, the air inlet of the exhaust pipe body 4 is provided with a square flange edge 6. The air outlet of the exhaust pipe body 4 is circular.

[0044] The first valve piece 1 and the second valve piece 2 are both semicircular and are adapted to rotate around the rotation shaft 3 to open or close the air flow channel 5 of the exhaust pipe body 4. In other words, the first valve piece 1 is semicircular and is adapted to rotate around the rotation shaft 3 to open or close half of the air flow channel 5 of the exhaust pipe body 4; the second valve piece 2 is semicircular and is adapted to rotate around the rotation shaft 3 to open or close half of the air flow channel 5 of the exhaust pipe body 4.

[0045] When the air flow passage 5 of the exhaust pipe body 4 is closed, the first valve piece 1 and the second valve piece 2 are spliced together and integrally round, as shown in Figure 8 , thereby preventing the oil fume of the public chimney from backflowing and preventing small animals from climbing into the room through the air flow passage 5 from the outside. The rotation shaft 3 of the first valve piece 1 and the rotation shaft 3 of the second valve piece 2 are parallel to each other and arranged side by side.

[0046] The exhaust pipe body 4 is provided with a support seat 10, as shown in Figure 1 , 2 and 3. The exhaust pipe body 4 is a plastic or rubber integrally injection molded part. The support seat 10 is integrally formed on the exhaust pipe body 4.

[0047] The exhaust pipe body 4 is also provided with a first insertion hole 7 and a second insertion hole 8, which are arranged opposite to the support seat 10, as shown in Figure 4 and 5 . One end of the rotation shaft 3 of the first valve piece 1 is inserted into the first insertion hole 7, and the other end is placed on the support seat 10. One end of the rotation shaft 3 of the second valve piece 2 is inserted into the second insertion hole 8, and the other end is placed on the support seat 10.

[0048] When the other end of the rotation shaft 3 of the first valve piece 1 and the other end of the rotation shaft 3 of the second valve piece 2 are placed on the support seat 10, the buckle 16 is clamped on the support seat 10, at this time, based on the limiting action of the buckle 16, the other end of the rotation shaft 3 of the first valve piece 1 and the other end of the rotation shaft 3 of the second valve piece 2 are rotatably arranged on the support seat 10. Thus, the assembly of the first valve piece 1 and the second valve piece 2 is completed, as shown in Figure 8 , at this time, the first valve piece 1 and the second valve piece 2 are rotatably arranged in the air flow passage 5 of the exhaust pipe body 4.

[0049] The exhaust pipe body 4 is provided with a circular outer pipe wall around the exhaust pipe opening. The outer pipe wall and the exhaust pipe opening of the exhaust pipe body 4 are spaced apart to form a circular annular groove 13 suitable for embedding the air inlet head of the smoke pipe, as shown in Figure 1 , 2 , 4, 6, 7, 8, 10 and 12.

[0050] The support seat 10 is arranged at the groove bottom of the circular annular groove 13. The exhaust pipe opening of the exhaust pipe body 4 is provided with a notch 14, and the support seat 10 is arranged at the notch 14, as shown in Figure 1 , 2 , 8 and 12. The notch 14 is in the shape of an inverted trapezoid.

[0051] The outer pipe wall is provided with a screw hole 15, as shown in Figure 4When the air inlet head of the smoke exhaust pipe is embedded in the circular groove 13 of the air duct seat, a screw is screwed through the screw hole 15 from the outside to the inside, and the screw passes through the air inlet head of the smoke exhaust pipe, thereby firmly fixing the air inlet head of the smoke exhaust pipe in the circular groove 13 of the air duct seat. The number of screw holes can be one or multiple, evenly arranged along the outer pipe wall.

[0052] The air outlet end of the smoke exhaust pipe is connected to the public flue. The air inlet head of the smoke exhaust pipe is embedded in the circular groove 13 of the air duct seat.

[0053] The wall of the air outlet of the exhaust pipe body 4 is provided with an oil leakage hole 9, as shown in Figure 5 When the air inlet head of the smoke exhaust pipe is embedded in the circular groove 13 of the air duct seat, the grease attached to the smoke exhaust pipe may flow into the circular groove 13 of the air duct seat, and this part of the grease will eventually flow into the air flow channel 5 of the exhaust pipe body 4 through the oil leakage hole 9, and finally flow into the oil collecting device, for example, the oil cup of the range hood.

[0054] The notch 14 is arranged such that when the first valve plate 1 is assembled, before the one end of the rotating shaft 3 of the first valve plate 1 is inserted into the first insertion hole 7, the plate body of the first valve plate 1 is adapted to be partially inserted into the circular groove 13 through the notch 14, so that the first valve plate 1 will not be deformed during assembly, as shown in Figure 6 Similarly, the notch 14 is arranged such that when the second valve plate 2 is assembled, before the one end of the rotating shaft 3 of the second valve plate 2 is inserted into the second insertion hole 8, the plate body of the second valve plate 2 is adapted to be partially inserted into the circular groove 13 through the notch 14, so that the second valve plate 2 will not be deformed during assembly, as shown in Figure 6 Then, the first valve plate 1 and the second valve plate 2 are translated in the direction of the arrow in Figure 6 , so that the one end of the rotating shaft 3 of the first valve plate 1 is inserted into the first insertion hole 7, and the one end of the rotating shaft 3 of the second valve plate 2 is inserted into the second insertion hole 8, as shown in Figure 7 Then, the buckle 16 is buckled to the support seat 10, and the assembly of the first valve plate 1 and the second valve plate 2 is completed, as shown in Figure 8 At this time, the other end of the rotating shaft 3 of the first valve plate 1 and the other end of the rotating shaft 3 of the second valve plate 2 are rotatably arranged in the support seat 10. When the buckle 16 is buckled to the support seat 10, due to the limitation of the buckle 16, the other end of the rotating shaft 3 of the first valve plate 1 and the other end of the rotating shaft 3 of the second valve plate 2 cannot be separated from the support seat 10, so that the one end of the rotating shaft 3 of the first valve plate 1 cannot be separated from the first insertion hole 7, and the one end of the rotating shaft 3 of the second valve plate 2 cannot be separated from the second insertion hole 8.

[0055] The buckle 16 includes a body part 17 and an elastically deformable buckling part, as shown in Figure 15 and 16The clamping portion is arranged to be suitable for elastic deformation to clamp the support base 10. Specifically, the clamping portion comprises a first clamping hook 19 and a second clamping hook 20 arranged oppositely. The first clamping hook 19 and the second clamping hook 20 are integrally formed at the left and right ends of the body portion 17 respectively. The support base 10 comprises a first protruding edge 11 and a second protruding edge 12 arranged oppositely, as shown in Figure 3 When the clamping member 16 is clamped to the support base 10, the first clamping hook 19 is elastically deformed to clamp the first protruding edge 11, and the second clamping hook 20 is elastically deformed to clamp the second protruding edge 12, as shown in Figure 13

[0056] The clamping member 16 is integrally formed. Preferably, the clamping member 16 is integrally injection molded by plastic or rubber.

[0057] When the clamping member 16 is assembled to the support base 10, the specific operation is as follows: first, place the clamping member 16 on the support base 10, then apply a certain pressing force downward, the first clamping hook 19 is elastically deformed to clamp the first protruding edge 11, and the second clamping hook 20 is elastically deformed to clamp the second protruding edge 12, so that the clamping member 16 is clamped to the support base 10, as shown in Figure 13

[0058] When it is necessary to remove the clamping member 16 from the support base 10, a certain external force is applied manually or with the aid of a tool to make the first clamping hook 19 elastically deform to disengage from the first protruding edge 11 and make the second clamping hook 20 elastically deform to disengage from the second protruding edge 12, so that the clamping member 16 is removed from the support base 10. At this time, without the restriction of the clamping member 16, the first valve plate 1 and the second valve plate 2 can be manually removed from the exhaust pipe body 4.

[0059] The clamping member 16 is provided with a first stopper 21 and a second stopper 22, as shown in Figure 16 When the clamping member 16 is clamped to the support base 10, the first stopper 21 is suitable for resisting the end of the other end of the rotating shaft 3 of the first valve plate 1 to make one end of the rotating shaft 3 of the first valve plate 1 not disengage from the first insertion hole 7, and the second stopper 22 is suitable for resisting the end of the other end of the rotating shaft 3 of the second valve plate 2 to make one end of the rotating shaft 3 of the second valve plate 2 not disengage from the second insertion hole 8.

[0060] The insertion slot 23 is formed between the first stopper 21 and the second stopper 22, as shown in Figure 15 and 16 The support base 10 is provided with an insertion protruding portion 30, a first limiting protruding portion 28 and a second limiting protruding portion 29, as shown in Figure 3 ​​The insertion protrusion 30 is located between the first limiting protrusion 28 and the second limiting protrusion 29. The insertion protrusion 30, the first limiting protrusion 28 and the second limiting protrusion 29 are integrally formed on the support base 10. When the buckle member 16 is clamped on the support base 10, the insertion protrusion 30 is inserted into the insertion slot 23, as shown in Figure 8 .

[0061] The first limiting protrusion 28 and the second limiting protrusion 29 are higher than the insertion protrusion 30, as shown in Figure 3 . Thus, when the buckle member 16 is clamped on the support base 10, the first limiting protrusion 28 and the second limiting protrusion 29 are suitable for limiting the movement of the buckle member 16 in the horizontal dimension, thereby improving the stability of the clamping. In other words, when the buckle member 16 moves outward in the horizontal direction, it will be blocked by the first limiting protrusion 28, and when the buckle member 16 moves inward in the horizontal direction, it will be blocked by the second limiting protrusion 29.

[0062] The buckle member 16 is provided with two spacing protrusions 18, as shown in Figure 15 and 16 . The two spacing protrusions 18 are arranged on the outer side wall of the buckle member 16. When the buckle member 16 is clamped on the support base 10, the two spacing protrusions 18 are both abutted against the inner wall of the outer pipe wall, as shown in Figure 8 .

[0063] When assembling the buckle member 16 on the support base 10, the two spacing protrusions 18 are both slid downward along the inner wall of the outer pipe wall, thereby the spacing protrusions 18 can play a certain guiding role, facilitating the assembly operation.

[0064] The inner wall of the exhaust pipe body 4 is provided with a first support protrusion 31 and a second support protrusion 32, as shown in Figure 6 . The first support protrusion 31 is arranged to support the first valve piece 1 when the first valve piece 1 closes the airflow passage 5 of the exhaust pipe body 4. The number of the first support protrusion 31 is two, and the two first support protrusions 31 are arranged at a certain distance. The second support protrusion 32 is arranged to support the second valve piece 2 when the second valve piece 2 closes the airflow passage 5 of the exhaust pipe body 4. The number of the second support protrusion 32 is two, and the two second support protrusions 32 are arranged at a certain distance.

[0065] The cross-sectional area of the first support protrusion 31 increases in the direction of the airflow in the airflow passage 5. The cross-sectional area of the second support protrusion 32 increases in the direction of the airflow in the airflow passage 5. Thus, the first support protrusion 31 and the second support protrusion 32 reduce the obstruction to the airflow in the airflow passage 5, and the smoke exhaust is more smooth.

[0066] The rotating shaft 3 of the first valve piece 1 is integrally formed on the first valve piece 1. The rotating shaft 3 of the second valve piece 2 is integrally formed on the second valve piece 2. The first valve piece 1 and the second valve piece 2 have the same structure and can be replaced with each other. The first valve piece 1 and the second valve piece 2 are as shown in Figure 14

[0067] When the clamping piece 16 is clamped on the support seat 10, the third insertion hole and the fourth insertion hole are formed between the clamping piece 16 and the support seat 10. The third insertion hole and the fourth insertion hole are arranged side by side. The other end of the rotating shaft 3 of the first valve piece 1 is arranged in the third insertion hole. The other end of the rotating shaft 3 of the second valve piece 2 is arranged in the fourth insertion hole.

[0068] The inner wall of the exhaust pipe body 4 is provided with a reverse T-shaped support 24, as shown in Figure 5 and 11 The reverse T-shaped support 24 is provided with a first guide surface 25 and a second guide surface 26 arranged oppositely. The first guide surface 25 and the second guide surface 26 are provided with a spacing protruding plate 27 arranged therebetween. The first guide surface 25 is arranged to guide the one end of the rotating shaft 3 of the first valve piece 1 to be inserted into the first insertion hole 7. The second guide surface 26 is arranged to guide the one end of the rotating shaft 3 of the second valve piece 2 to be inserted into the second insertion hole 8.

[0069] The application also provides an exhaust hood, which comprises a machine body, a centrifugal fan and the above-mentioned air duct seat. The centrifugal fan is arranged in the machine body. The top wall of the machine body is provided with an exhaust hole.

[0070] The square flange edge 6 of the exhaust pipe body 4 of the air duct seat is connected to the exhaust hole. Specifically, the square flange edge 6 at the bottom end of the exhaust pipe body 4 is attached to the top wall of the machine body, and the two are fixed together by screws. At this time, the exhaust pipe opening of the exhaust pipe body 4 is open upward, and the airflow channel 5 of the exhaust pipe body 4 is in communication with the exhaust hole.

[0071] The exhaust pipe opening of the exhaust pipe body 4 of the air duct seat is connected to the air inlet end of the smoke exhaust pipe. Specifically, the air inlet pipe head of the smoke exhaust pipe is embedded in the annular groove 13 of the air duct seat. The air outlet end of the smoke exhaust pipe is connected to the public flue.

[0072] When it is necessary to exhaust oil fume, the exhaust hood is started, the centrifugal fan is operated, a negative pressure is formed, an oil fume airflow is generated, the oil fume airflow flows into the machine body, the oil fume airflow flows through the centrifugal fan, and then the oil fume airflow flows into the airflow channel 5 of the exhaust pipe body 4 of the air duct seat, and then the oil fume airflow flows into the smoke exhaust pipe, and then the oil fume airflow flows into the public flue. It should be noted that the oil fume airflow generated by the operation of the centrifugal fan can push open the first valve piece 1 and the second valve piece 2, so that the oil fume airflow can smoothly flow through the airflow channel 5 of the exhaust pipe body 4 of the air duct seat.

[0073] ​The spacer 27 is adapted to stop the first valve plate 1 and the second valve plate 2, thereby limiting the maximum opening angle of the first valve plate 1 and the second valve plate 2 when they are pushed open by the oil fume flow.

[0074] The first limiting protrusion 28 and / or the second limiting protrusion 29 are also adapted to stop the first valve plate 1 and the second valve plate 2, thereby limiting the maximum opening angle of the first valve plate 1 and the second valve plate 2 when they are pushed open by the oil fume flow.

[0075] When the range hood is turned off, the centrifugal fan stops running, the negative pressure for generating the oil fume flow disappears, and the first valve plate 1 and the second valve plate 2 are reset under the action of their own gravity. The free end of the first valve plate 1 is placed on the first support protrusion 31, and the free end of the second valve plate 2 is placed on the second support protrusion 32, as shown in FIG. 5. At this time, the first valve plate 1 and the second valve plate 2 jointly close the air flow passage 5 of the exhaust pipe body 4. Figure 8

[0076] Exemplarily, the present application also proposes another range hood embodiment, in which the centrifugal fan is external, i.e. the centrifugal fan is arranged outside the machine body and is connected with the machine body through an oil fume conveying pipeline. Preferably, the centrifugal fan is hiddenly arranged above the kitchen ceiling. The air inlet of the exhaust pipe body 4 of the air duct seat is connected with the smoke exhaust port of the centrifugal fan. The difference between this embodiment and the above-mentioned embodiment is mainly described, and the same and similar parts of this embodiment can be referred to the above-mentioned embodiment.

[0077] Although specific embodiments have been described above, these embodiments are not intended to limit the scope of the present application, even if a single embodiment is described with respect to a particular feature. The features provided in the present application are intended to be illustrative rather than limiting, unless explicitly stated otherwise. In actual implementation, a plurality of features can be combined with each other as long as they are technically feasible according to actual needs. Various alternatives, modifications, and improvements can be conceived without departing from the spirit and scope of the present application.​

Claims

1. A duct base for exhausting cooking fumes, characterized in that: Includes exhaust pipe body (4) and fastener (16); It also includes a first valve plate (1) with a rotating shaft (3) and a second valve plate (2) with a rotating shaft (3); The first valve plate (1) and the second valve plate (2) are both semi-circular and are adapted to rotate around their axis (3) to open or close the airflow passage (5) of the exhaust pipe body (4); When the airflow passage (5) of the exhaust pipe body (4) is closed, the first valve plate (1) and the second valve plate (2) are spliced ​​together and the whole is circular; The exhaust pipe body (4) is provided with a support base (10); The exhaust pipe body (4) is also provided with a first insertion hole (7) and a second insertion hole (8) that are both arranged facing the support base (10); The first valve plate (1) has a rotating shaft (3) with one end inserted into the first insertion hole (7) and the other end resting on the support base (10); The shaft (3) of the second valve plate (2) is inserted into the second insertion hole (8) at one end and rests on the support base (10) at the other end. When the other end of the shaft (3) of the first valve plate (1) rests on the support base (10) and the other end of the shaft (3) of the second valve plate (2) rests on the support base (10), the buckle (16) is snapped onto the support base (10). Based on the limiting effect of the buckle (16), the other end of the shaft (3) of the first valve plate (1) and the other end of the shaft (3) of the second valve plate (2) are both located on the support base (10).

2. The duct base according to claim 1, characterized in that: The fastener (16) includes a snap-fit ​​portion that can be elastically deformed; The snap-fit ​​portion is configured to snap onto the support base (10) by undergoing elastic deformation.

3. The duct base according to claim 2, characterized in that: The support base (10) includes a first protruding edge (11) and a second protruding edge (12) arranged opposite to each other; The latching part includes a first latch (19) and a second latch (20) arranged opposite to each other; When the buckle (16) is engaged with the support base (10), the first hook (19) is engaged with the first protruding edge (11), and the second hook (20) is engaged with the second protruding edge (12).

4. The duct base according to claim 1, characterized in that: The buckle (16) is provided with a first stop (21) and a second stop (22); When the buckle (16) is engaged with the support base (10), the first stop (21) is adapted to abut against the other end of the shaft (3) of the first valve plate (1) so that one end of the shaft (3) of the first valve plate (1) does not disengage from the first insertion hole (7), and the second stop (22) is adapted to abut against the other end of the shaft (3) of the second valve plate (2) so that one end of the shaft (3) of the second valve plate (2) does not disengage from the second insertion hole (8).

5. The duct seat according to claim 4, characterized in that: An insertion slot (23) is formed between the first stop (21) and the second stop (22); The support base (10) is provided with a plug-in protrusion (30); When the buckle (16) is engaged with the support base (10), the insertion protrusion (30) is inserted into the insertion slot (23).

6. The duct base according to claim 1, characterized in that: The inner wall of the exhaust pipe body (4) is provided with a first support protrusion (31) and a second support protrusion (32); The first support protrusion (31) is configured to support the first valve plate (1) when the first valve plate (1) closes the airflow passage (5) of the exhaust pipe body (4); The second support protrusion (32) is configured to support the second valve plate (2) when the second valve plate (2) closes the airflow passage (5) of the exhaust pipe body (4); Along the airflow direction within the airflow channel (5), the cross-sectional area of ​​the first support protrusion (31) increases in a streamlined manner; Along the airflow direction within the airflow channel (5), the cross-sectional area of ​​the second support protrusion (32) increases in a streamlined manner.

7. The duct base according to claim 1, characterized in that: The rotating shaft (3) of the first valve plate (1) is integrally formed on the first valve plate (1); The pivot (3) of the second valve plate (2) is integrally formed on the second valve plate (2).

8. The duct base according to claim 1, characterized in that: When the buckle (16) is engaged with the support base (10), a third insertion hole and a fourth insertion hole are formed between the buckle (16) and the support base (10); The other end of the shaft (3) of the first valve plate (1) is inserted into the third insertion hole; The other end of the shaft (3) of the second valve plate (2) is inserted into the fourth insertion hole.

9. The duct base according to claim 1, characterized in that: The first valve plate (1) and the second valve plate (2) have the same structure and are interchangeable; and / or The buckle (16) is integrally molded.

10. The duct seat according to any one of claims 1 to 9, characterized in that: The exhaust pipe body (4) has an outer pipe wall surrounding the exhaust pipe opening; The outer pipe wall and the exhaust pipe opening of the exhaust pipe body (4) are spaced apart by an annular groove (13) suitable for embedding the intake pipe head of the exhaust pipe; The support base (10) is disposed at the bottom of the annular groove (13); The exhaust pipe body (4) has an exhaust pipe opening with a notch (14), and the support seat (10) is located at the notch (14).

11. The duct seat according to claim 10, characterized in that: The notch (14) is configured such that when assembling the first valve piece (1), before one end of the shaft (3) of the first valve piece (1) is inserted into the first insertion hole (7), the body of the first valve piece (1) is adapted to partially pass through the notch (14) and be placed in the annular groove (13) so that the first valve piece (1) will not be deformed during assembly. The notch (14) is configured such that when assembling the second valve piece (2), before one end of the pivot (3) of the second valve piece (2) is inserted into the second socket (8), the body of the second valve piece (2) is adapted to partially pass through the notch (14) and be placed in the annular groove (13) so that the second valve piece (2) will not deform during assembly.

12. A range hood, characterized in that: Includes the body and the duct seat as described in any one of claims 1 to 11; The top wall of the machine body is provided with an exhaust port; The duct seat is connected to the exhaust port.

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