Exhaust system and range hood

Abstract

This application discloses a ventilation device and a range hood. The ventilation device includes a housing, a volute, and a connector. The housing has a first cavity, the volute is located within the first cavity and has an air outlet, and the connector is located within the volute to communicate with the air outlet and protrudes from the housing to connect with an exhaust duct. The connector extends laterally and has a first oil leakage hole communicating with the first cavity. This technical solution, by providing a first oil leakage hole in the connector, allows oil flowing from the volute to flow into the housing through the first oil leakage hole in the connector, facilitating the collection and cleaning of oil. This effectively prevents oil from accumulating in the connector or flowing into the exhaust duct with the flow of fumes, reducing exhaust resistance and ensuring the normal operation of the ventilation device.

Description

Technical Field

[0001] This application relates to the field of range hood technology, and in particular to an exhaust device and a range hood. Background Technology

[0002] A split-type range hood has separate exhaust and smoke collection devices. The exhaust device is located above the smoke collection device, and the two devices are connected by a connecting pipe to transport the cooking fumes. The exhaust device is connected to an exhaust duct to discharge the fumes to the outside. During the operation of the exhaust device, grease will form inside the casing. This grease may accumulate or flow into the exhaust duct with the flow of cooking fumes, increasing air resistance and affecting the normal smoke extraction function of the range hood. Summary of the Invention

[0003] This application aims to at least partially solve the technical problems in the related art. To this end, this application proposes a ventilation device.

[0004] To achieve the above objectives, this application discloses a ventilation device, which includes:

[0005] The box body has a first cavity;

[0006] A volute, disposed in the first cavity, and provided with an air outlet; and

[0007] An adapter is provided on the volute to communicate with the air outlet and protrudes from the outside of the housing to be suitable for communication with the exhaust pipe. The adapter extends laterally and is provided with a first oil leakage hole that communicates with the first cavity.

[0008] In some embodiments of this application, the first oil leakage hole is located in the first cavity.

[0009] In some embodiments of this application, the first oil leakage hole is located at the lowest point of the adapter.

[0010] In some embodiments of this application, the adapter includes a first flow section, a second flow section, and a third flow section arranged sequentially along the smoke exhaust direction, wherein the lower part of the first flow section is lower than the lower part of the third flow section.

[0011] In some embodiments of this application, the second flow section is gradually narrowed along the exhaust direction.

[0012] In some embodiments of this application, the first oil leakage hole is located at the intersection of the first flow section and the second flow section.

[0013] In some embodiments of this application, the adapter is provided with an annular groove adapted for insertion of a smoke exhaust pipe, and a second oil leakage hole communicating with the annular groove and the first cavity.

[0014] In some embodiments of this application, the second oil leakage hole is located in the first cavity.

[0015] In some embodiments of this application, a portion of the second flow section of the adapter is located upstream of the second oil leak hole to block the second oil leak hole.

[0016] In some embodiments of this application, the adapter includes a first housing and a second housing connected to each other, the first housing being disposed on the volute housing and the second housing protruding from the outer surface of the housing.

[0017] In some embodiments of this application, the first housing and the second housing together enclose the first oil leakage hole.

[0018] In some embodiments of this application, the first housing forms a first flow segment of the adapter, and the second housing forms a second flow segment and a third flow segment of the adapter.

[0019] In some embodiments of this application, the second housing includes an inner annular wall and an outer annular wall, an annular groove is formed between the inner annular wall and the outer annular wall to accommodate the insertion of a smoke exhaust duct, and the inner annular wall forms the second flow section and the third flow section.

[0020] In some embodiments of this application, the inner ring wall and the outer ring wall pass through the box body from the first cavity, and a second oil leakage hole communicating with the annular groove and the first cavity is also formed between the outer ring wall and the inner ring wall.

[0021] The technical solution of this application provides a first oil leakage hole in the adapter, allowing oil flowing out of the volute to flow into the housing through the first oil leakage hole in the adapter, which facilitates the collection and cleaning of oil. This effectively prevents oil from accumulating in the volute and adapter, or from flowing into the exhaust duct and accumulating with the flow of fumes, thereby reducing exhaust resistance and ensuring the normal operation of the exhaust device.

[0022] Other advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description or may be learned by practice of this application. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other designs can be obtained based on the structures shown in these drawings without creative effort.

[0024] Figure 1 These are schematic diagrams of range hoods in some embodiments;

[0025] Figure 2 Here are exploded views of the range hood in some embodiments;

[0026] Figure 3 for Figure 2 Enlarged view of the area marked A (the black dots in the image represent oil stains);

[0027] Figure 4 Schematic diagram of the adapter in some embodiments;

[0028] Figure 5 Exploded views of the adapter in some embodiments;

[0029] Figure 6 This is a schematic diagram of the second housing in some embodiments;

[0030] Figure 7 Cross-sectional view of the adapter in some embodiments.

[0031] Explanation of icon numbers:

[0032] Exhaust device 1000;

[0033] 1100 for the housing, 1110 for the air inlet, and 1120 for the first cavity;

[0034] 1200 for the volute and 1210 for the air outlet;

[0035] Adapter 1300;

[0036] First housing 1310, first flow section 1311, first oil leakage hole 1312;

[0037] Second shell 1320, second flow section 1321, third flow section 1322, inner ring wall 1323, outer ring wall 1324, annular groove 1325, second oil leakage hole 1326;

[0038] Connecting pipe 2000;

[0039] Smoke collection device 3000;

[0040] Smoke exhaust duct 4000.

[0041] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0042] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0043] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0044] In this application, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0045] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. If the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed in this application.

[0046] This application discloses a ventilation device 1000. The ventilation device 1000 will be described in detail below in conjunction with a range hood. It is understood that the ventilation device 1000 disclosed in this application is not limited to use in range hoods, but can also be applied to other smoke extraction and exhaust equipment.

[0047] Combination Figures 1 to 3As shown in some embodiments of this application, the exhaust device 1000 includes a housing 1100, a volute 1200, and a connector 1300. The housing 1100 is provided with a first cavity 1120, the volute 1200 is disposed in the first cavity 1120, and the connector 1300 is provided with a first oil leakage hole 1312. Through the cooperation of the first oil leakage hole 1312 and the first cavity 1120, the oil in the volute 1200 can flow to the connector 1300 and then flow to the housing 1100 through the first oil leakage hole 1312. The oil formed on the connector 1300 can also flow to the housing 1100 through the first oil leakage hole 1312. The housing 1100 facilitates the collection of oil, so that the oil will not accumulate in the volute 1200, nor will it enter the exhaust duct 4000 with the flow of oil fumes.

[0048] Specifically, the exhaust device 1000 is adapted to cooperate with the connecting pipe 2000 and the smoke collection device 3000 to form a range hood. The main function of the smoke collection device 3000 is to gather and collect the oil fumes, the function of the connecting pipe 2000 is to transmit the oil fumes, and the main function of the exhaust device 1000 is to create negative pressure, thereby providing power for the flow of oil fumes and achieving the suction of oil fumes. The smoke collection device 3000 forms a hollow cavity, in which oil fumes easily gather and are then conveniently sucked away by the exhaust device 1000 through the connecting pipe 2000. The exhaust device 1000 includes a fan, which includes a volute 1200, a fan wheel installed in the volute 1200, and a motor driven by the fan wheel. The operation of the fan creates negative pressure, thereby achieving the suction of oil fumes. The smoke collection device 3000 and the exhaust device 1000 are two separate components, connected by a connecting pipe 2000 to transfer cooking fumes. This means that this type of fume extraction system has a split structure. The exhaust device 1000 can be placed inside the kitchen ceiling, which is a relatively sealed space, effectively minimizing the noise emitted by the exhaust device 1000. The separation of the exhaust device 1000 from the smoke collection device 3000 also frees up space at the front of the smoke collection device 3000, reducing the impact of the exhaust device 1000's size on the overall design of the smoke collection device 3000. It is understood that the cooking fumes referred to in this article are a gaseous mixture produced during cooking, containing air, water vapor, and various organic compounds.

[0049] The exhaust fan 1000 needs to be connected to the exhaust duct 4000, which is connected to the outside. The fumes extracted by the exhaust fan 1000 are discharged to the outside through the exhaust duct 4000. During the operation of the exhaust fan 1000, oil mist particles in the fumes adhere to the structures corresponding to the flow path, forming oil stains, such as oil stains in the volute 1200 and the adapter 1300. The oil stains may accumulate in the volute 1200 or enter the exhaust duct 4000 with the flow of fumes, thereby increasing the resistance of the entire flow of fumes and affecting the normal exhaust operation of the range hood. To solve the above problems, the following solution is adopted.

[0050] The housing 1100 is primarily used to house the fan; therefore, the housing 1100 needs to be a hollow structure to allow the fan to be installed within it. For example, combined with... Figure 1 and Figure 2 As shown, the housing 1100 has a flat cubic structure with six side panels (not marked in the figure): an upper side panel, a lower side panel, a front side panel, a rear side panel, a left side panel, and a right side panel. The lower side panel has an air inlet 1110. The connecting pipe 2000 and the exhaust device 1000 are connected to the lower side panel of the housing 1100, communicating with the air inlet 1110. Oil fumes transmitted through the connecting pipe 2000 enter the interior of the housing 1100 through the air inlet 1110 and are then exhausted by the fan. The upper side panel, lower side panel, front side panel, rear side panel, left side panel, and right side panel together form a first cavity 1120, in which the fan can be installed.

[0051] The fan is located in the first cavity 1120 within the housing 1100, and the volute 1200 houses the impeller, thus guiding the fumes. In this embodiment, the volute 1200 is placed horizontally, meaning its axial direction extends vertically, thereby reducing the overall thickness of the exhaust device 1000. The volute 1200 has a vent and an outlet 1210. The rotation of the impeller draws the fumes entering the housing 1100 through the vent into the volute 1200, and then discharges them through the outlet 1210.

[0052] To facilitate the connection between the volute 1200 and the exhaust duct 4000, an adapter 1300 is provided. The adapter 1300 is a structure designed to connect with the exhaust duct 4000. The adapter 1300 is connected to the air outlet 1210, thus receiving the fumes discharged from the volute 1200. For example, the adapter 1300 can be mounted on the volute 1200. It can be that the volute 1200 and the adapter 1300 are two independent components, connected to each other by screws, plugs, or snap-fits. Alternatively, the volute 1200 and the adapter 1300 can be an integrated structure. Of course, a separate structure for the volute 1200 and the adapter 1300 would significantly reduce the manufacturing difficulty of both. The fumes output through the air outlet 1210 of the volute 1200 then enter the exhaust duct 4000 through the adapter 1300. It can be understood that the adapter 1300 is a hollow tubular structure, so as to connect with the air outlet 1210 and transmit the fumes to the exhaust duct 4000.

[0053] The volute 1200 will accumulate oil to some extent. This oil can flow into the adapter 1300 with the flow of fumes, thus preventing oil buildup within the volute 1200. However, if the oil flowing into the adapter 1300 continues into the exhaust duct 4000, it will accumulate there. Alternatively, fumes flowing through the adapter 1300 may also create oil on it, which may then flow into the exhaust duct 4000. Since oil fumes may form oil on the inner wall of the exhaust duct 4000 upon entering, further accumulation will exacerbate the problem. Even if the oil does not flow into the exhaust duct with the fumes, it will still accumulate in the volute 1200, adapter 1300, and other areas. Therefore, in this embodiment, a first oil drain hole 1312 is provided on the adapter 1300. The first oil drain hole 1312 is a through hole structure that connects the inside and outside of the adapter 1300. In this way, when oil flows through the adapter 1300, the oil can be drained away through the first oil drain hole 1312. This avoids the accumulation of oil on the volute 1200 and the adapter 1300, and also prevents oil from entering the exhaust pipe 4000. In addition, the exhaust pipe 4000 can be designed with a certain slope, so that the oil formed in the exhaust pipe 4000 can flow to the first oil drain hole 1312 during the backflow process, and then be drained away through the first oil drain hole 1312.

[0054] The first oil drain hole 1312 can be set to one, two, or more, as long as the first oil drain hole 1312 is set in the path of oil flow, so that the oil can be drained away.

[0055] Since the first oil drain hole 1312 is connected to the first cavity 1120, the oil discharged from the first oil drain hole 1312 enters the housing 1100, and the oil entering the housing 1100 is convenient for further collection and treatment. It is understandable that, generally speaking, range hoods are equipped with oil collection devices, and the oil flowing into the housing 1100 is eventually collected by the oil collection device for easy handling by the user.

[0056] Furthermore, the adapter 1300 in this embodiment is arranged horizontally, that is, in a roughly horizontal state, and can be tilted at a certain angle relative to the horizontal state, for example, see [reference needed]. Figure 1 and Figure 2 As shown, the adapter 1300 extends in the left-right direction, which complements the lateral orientation of the volute 1200 (the axial direction of the volute 1200 extends in opposite directions vertically). This allows the range hood to exhaust air from the left and right, making it suitable for a wider range of kitchen installation environments. Furthermore, the lateral orientation of the adapter 1300 also ensures that the volute 1200 is lateral, making it easier for grease in the volute 1200 to be discharged with the flow of fumes. Additionally, it prevents grease in the adapter 1300 and the exhaust duct 4000 from flowing back into the volute 1200.

[0057] As can be seen from the above, the technical solution of this application provides a first oil leakage hole 1312 in the adapter 1300, so that the oil flowing out of the volute 1200 can flow into the housing 1100 through the first oil leakage hole 1312 in the adapter 1300, which facilitates the collection and cleaning of oil. This can effectively prevent oil from accumulating in the volute and adapter 1300, or from flowing into the exhaust pipe 4000 and accumulating with the flow of oil fumes, thereby reducing exhaust resistance and ensuring the normal operation of the exhaust device 1000.

[0058] To facilitate the removal of oil sludge drained through the first oil drain hole 1312 into the housing 1100, in some embodiments of this application, combined with Figure 2 and Figure 3 As shown, the first oil drain hole 1312 is set in the first cavity 1120. In this way, the oil discharged through the first oil drain hole 1312 flows into the first cavity 1120 under the action of gravity, eliminating the need for additional intermediate parts and simplifying the structure.

[0059] Optionally, to further prevent oil buildup or entry into the exhaust duct 4000, and to drain as much oil as possible from the adapter 1300 through the first oil drain hole 1312, in some embodiments of this application, combined with Figure 3As shown, the first oil drain hole 1312 is located at the lowest position of the adapter 1300. Specifically, the adapter 1300 has a lowest position, and the oil will flow towards this lowest position under the action of the oil fumes and the gravity of the oil itself, so that as much oil as possible can flow away through the first oil drain hole 1312.

[0060] Combination Figure 3 and Figure 7 As shown, in some embodiments of this application, in order to further prevent oil stains from entering the exhaust duct 4000 along with the flow of oil fumes and accumulating in the exhaust duct 4000, the adapter 1300 is designed with three flow segments along the exhaust direction, namely the first flow segment 1311, the second flow segment 1321 and the third flow segment 1322. The second flow segment 1321 is located between the first flow segment 1311 and the third flow segment 1322 and is connected to the first flow segment 1311 and the third flow segment 1322, which is equivalent to the second flow segment 1321 forming a transition segment. The lower part of the first flow segment 1311 is designed to be higher than the lower part of the third flow segment 1322. Understandably, when oil flows, it tends to flow downwards under the influence of gravity. Therefore, the oil will mainly flow from the lower part of the volute 1200 to the lower part of the adapter 1300. By designing the lower part of the first flow section 1311 to be lower, the oil will be obstructed when it flows from the first flow section 1311 to the second flow section 1321, making it difficult for the oil to enter the third flow section 1322. This can prevent the oil from entering the exhaust pipe 4000 to the greatest extent.

[0061] Optionally, in some embodiments of this application, the second flow section 1321 is designed to taper along the direction of smoke exhaust. This, in conjunction with the third flow section 1322, forms a stepped structure in the circumference of the adapter 1300. This stepped structure effectively blocks oil contaminants throughout the circumference of the adapter 1300. It is understood that while oil contaminants primarily flow from the lower part of the adapter 1300, a small amount may also be present in the upper part. Forming this stepped structure along the circumference maximizes the prevention of oil contaminants from entering the smoke exhaust duct 4000. Furthermore, designing the second flow section 1321 as a tapering structure significantly reduces the manufacturing difficulty of the adapter 1300, and makes the structure of the adapter 1300 more symmetrical, further reducing resistance to oil fumes.

[0062] Optionally, because the cooperation of the first flow section 1311, the second flow section 1321, and the third flow section 1322 causes obstruction when oil enters the second flow section 1321, placing the first oil drain hole 1312 at the junction of the second flow section 1321 and the first flow section 1311 makes it easier to discharge the oil into the housing 1100. It is understandable that because the bottom of the third flow section 1322 is higher than the bottom of the first flow section 1311, oil will encounter obstruction when entering the second flow section 1321 from the first flow section 1311. Therefore, oil tends to accumulate in the area between the first flow section 1311 and the second flow section 1321. Placing the first oil drain hole 1312 at this location makes it easier to drain the oil.

[0063] Combination Figure 3 , Figure 4 , Figure 5 and Figure 7 As shown, in some embodiments of this application, to facilitate the connection of the exhaust pipe 4000, an annular groove 1325 is provided on the adapter 1300, so that the exhaust pipe 4000 can be easily inserted into the annular groove 1325. During the formation of oil stains, oil stains may flow into the annular groove 1325 from the gap between the exhaust pipe 4000 and the annular groove 1325. Therefore, a second oil leakage hole 1326 is also provided on the adapter 1300. The annular groove 1325 is connected to the second oil leakage hole 1326, and the second oil leakage hole 1326 is connected to the first receiving cavity. When oil stains enter the second annular groove 1325, they can be discharged into the first receiving cavity 1120 through the second oil leakage hole 1326, preventing oil stains from overflowing and dripping to the outside from the gap between the exhaust pipe 4000 and the annular groove 1325.

[0064] Optionally, to facilitate the discharge of oil through the second oil drain hole 1326 into the housing 1100, in some embodiments of this application, combined with Figure 3 As shown, the second oil drain hole 1326 is set in the first cavity 1120. In this way, the oil discharged through the second oil drain hole 1326 flows into the second cavity under the action of gravity, eliminating the need for additional intermediate parts and simplifying the structure.

[0065] Because the adapter 1300 is provided with a first oil drain hole 1312 and a second oil drain hole 1326, during the process of exhausting oil fumes, some oil may flow out through the first oil drain hole 1312 and enter the second oil drain hole 1326, and then be directly discharged into the kitchen environment. In some embodiments of this application, combined with Figure 3 and Figure 6As shown, a portion of the second flow section 1321 is located upstream of the second oil drain hole 1326. For example, when the second flow section 1321 is designed to taper, a portion of the second flow section 1321 faces the direction of smoke exhaust and extends at an angle. In this way, when the fumes flow out through the first oil drain hole 1312, due to the obstruction of the second flow section 1321, the fumes are not easily able to enter the annular groove 1325 through the second oil drain hole 1326 and then be directly discharged into the kitchen environment.

[0066] The adapter 1300 is a component used to connect the volute 1200 and the exhaust duct 4000. The adapter 1300 can be a one-piece molded structure, but one-piece molding of the adapter 1300 is difficult to manufacture. Therefore, to reduce the manufacturing difficulty of the adapter 1300, a combination of... Figure 5 As shown, in some embodiments of this application, the adapter 1300 is designed to consist of two parts: a first housing 1310 and a second housing 1320. The first housing 1310 and the second housing 1320 are connected together as a whole. The first housing 1310 is disposed on the volute 1200, meaning that the first housing 1310 and the volute 1200 are fixed to each other. This can be achieved by the first housing 1310 and the volute 1200 being integrally formed, or by a connection method. In this embodiment, the first housing 1310 and the volute 1200 are manufactured separately and connected to each other using screw connections, plug-in connections, or other methods. The first housing 1310 and the second housing 1320 can also be fixed to each other using screw connections, snap-fit ​​connections, or other methods.

[0067] Optionally, when the adapter 1300 is composed of two parts, in order to reduce the manufacturing difficulty of the first oil leakage hole 1312, the first oil leakage hole 1312 is set to be formed by the connection of the first housing 1310 and the second housing 1320. That is, the first housing 1310 cannot form the first oil leakage hole 1312 on its own, and the second housing 1320 cannot form the first oil leakage hole 1312 on its own. Thus, the first housing 1310 and the second housing 1320 only need to form a notch, and the first housing 1310 and the second housing 1320 can form the first oil leakage hole 1312 after being connected.

[0068] Optionally, combined Figures 5 to 7 As shown, in some embodiments of this application, the first housing 1310 constitutes the first flow section 1311 mentioned above, and the second housing 1320 constitutes the second flow section 1321 and the third flow section 1322 mentioned above. Since oil stains are more likely to accumulate between the first flow section 1311 and the second flow section 1321, by forming a first oil leakage hole 1312 by enclosing the first housing 1310 and the second housing 1320, the first oil leakage hole 1312 is more conveniently located at the lowest position of the adapter 1300, thereby making it easier to drain the oil stains.

[0069] Specifically, in combination Figure 7 As shown, the second housing 1320 includes an outer ring wall 1324 and an inner ring wall 1323. The inner ring wall 1323 is disposed inside the outer ring wall 1324. The inner ring wall 1323 forms the second flow section 1321 and the third flow section 1322. The outer ring wall 1324 is a hollow annular structure, and the inner ring wall 1323 is also a hollow annular structure. In this way, an annular groove 1325 can be formed between the outer ring wall 1324 and the inner ring wall 1323, which facilitates the insertion and fixation of the smoke exhaust pipe 4000.

[0070] Combination Figure 3 As shown, in some embodiments of this application, a portion of the second housing 1320 is located within the first cavity 1120, thereby cooperating with the first housing 1310 to achieve mutual connection between the first housing 1310 and the second housing 1320. When a portion of the second housing 1320 is located within the first cavity 1120, it means that a portion of the inner ring wall 1323 and a portion of the outer ring wall 1324 are also located within the first cavity 1120. Thus, when a second oil leakage hole 1326 communicating with the first cavity 1120 is formed between the inner ring wall 1323 and the outer ring wall 1324, the second oil leakage hole 1326 can be directly connected to the first cavity 1120.

[0071] This application also discloses a range hood, which includes the exhaust device 1000 of the above embodiments. It is understood that the structure of the exhaust device 1000 in this embodiment adopts the technical solution of the above embodiments, and therefore has at least the beneficial effects brought by the technical solution of the above embodiments, which will not be repeated here.

[0072] The above description is merely a preferred embodiment of this application and does not limit the patent scope of this application. Any equivalent structural transformations made based on the concept of this application and the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this application.

Claims

1. A range hood, characterized in that, The range hood includes a smoke collection device, a connecting pipe, and an exhaust device. The smoke collection device and the exhaust device are connected through the connecting pipe. The exhaust device includes: The housing has a first cavity and the first cavity is connected to the connecting pipe; A volute, disposed in the first cavity, and provided with an air outlet; and An adapter is disposed on the volute to communicate with the air outlet and protrudes from the outside of the housing to be suitable for communication with the exhaust duct. The adapter extends laterally and has a first oil leakage hole communicating with the first cavity. The adapter includes a first flow section, a second flow section, and a third flow section arranged sequentially along the exhaust direction. The lower part of the first flow section is lower than the lower part of the third flow section. The second flow section is gradually narrowed along the exhaust direction. The first oil leakage hole is disposed at the intersection of the first flow section and the second flow section.

2. The range hood as described in claim 1, characterized in that, The first oil leakage hole is located in the first cavity.

3. The range hood as described in claim 1, characterized in that, The first oil leakage hole is located at the lowest point of the adapter.

4. The range hood as described in claim 1, characterized in that, The adapter is provided with an annular groove for insertion of a smoke exhaust pipe, and a second oil leakage hole communicating with the annular groove and the first cavity.

5. The range hood as described in claim 4, characterized in that, The second oil leakage hole is located in the first cavity.

6. The range hood as described in claim 4, characterized in that, The second flow section of the adapter is located upstream of the second oil leak hole to block the second oil leak hole.

7. The range hood as described in claim 1, characterized in that, The adapter includes a first housing and a second housing connected to each other, the first housing being disposed on the volute housing and the second housing protruding from the outer body of the housing.

8. The range hood as described in claim 7, characterized in that, The first housing and the second housing together form the first oil leakage hole.

9. The range hood as described in claim 8, characterized in that, The first housing forms the first flow section of the adapter, and the second housing forms the second and third flow sections of the adapter.

10. The range hood as described in claim 9, characterized in that, The second housing includes an inner annular wall and an outer annular wall, with an annular groove formed between the inner and outer annular walls to accommodate the insertion of a smoke exhaust duct, and the inner annular wall forming the second flow section and the third flow section.

11. The range hood as described in claim 10, characterized in that, The inner and outer ring walls extend through the first cavity into the housing, and a second oil leakage hole is formed between the outer and inner ring walls, communicating with the annular groove and the first cavity.

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