Anti-reverse adapter and extractor hood

Abstract

The utility model relates to a kind of reverse stop adapter and range hood, reverse stop adapter includes check valve and adapter, check valve is used to connect in the air outlet end of fan, and first clamping portion is provided on the outer wall of check valve;Adapter includes first end and second end, and first clamping portion is formed on the outer wall of first end, for with first clamping portion detachable connection;Second end is used for with smoke pipe retainer ring detachable connection;When the size of the model of range hood and the reserved smoke pipe is not matched, the matching connection of range hood and smoke pipe can be realized by the reverse stop adapter, meet the model selection range of range hood of user is not limited, user experience is good, and the connection sealing property between range hood and smoke pipe after replacement is good, avoid smoke leakage.

Description

Technical Field

[0001] This utility model belongs to the field of household appliance technology, and in particular relates to an anti-reverse connection device and a range hood. Background Technology

[0002] A range hood is a kitchen appliance that purifies the kitchen environment and has now become an essential appliance in the kitchen. Range hoods can improve the hygiene of the kitchen environment and are beneficial to the health of users.

[0003] Range hoods are typically installed above kitchen stoves to quickly remove combustion waste and harmful fumes produced during cooking, venting them outdoors through a flue to reduce fume inhalation. The size of the flue varies depending on the model of the range hood. Some flues are pre-installed in walls or ceilings during renovation, making them inconvenient to replace along with the range hood. When replacing a range hood with a different model, the opening size of the check valve on the range hood may not match the pre-installed flue size, resulting in a larger gap between the flue and the replaced check valve, making connection difficult and potentially causing fumes to leak. Utility Model Content

[0004] The purpose of this utility model is to provide a reverse connection device and a range hood to solve the problems in the prior art, such as the mismatch between the size of the range hood and the reserved smoke pipe, the limitation of the reserved smoke pipe size when selecting a range hood, and the poor user experience.

[0005] To achieve the above-mentioned objectives, the present invention employs the following technical solution:

[0006] In one aspect, the present invention provides a reverse connection prevention device, comprising:

[0007] A check valve is used to connect to the air outlet of a fan, and a first snap-fit ​​part is provided on the outer wall of the check valve;

[0008] The adapter includes a first end and a second end. A first snap-fit ​​portion is formed on the outer wall of the first end, and the first snap-fit ​​portion is detachably connected to the first snap-fit ​​portion. The second end is used for detachable connection with the smoke pipe guard ring.

[0009] In some embodiments of this application, the air outlet end of the check valve is provided with a first connecting peripheral wall and a first mating peripheral wall. Along the radial direction of the air outlet end of the check valve, the first mating peripheral wall is located inside the first connecting peripheral wall, and the first snap-fit ​​portion is formed on the first connecting peripheral wall.

[0010] The first connecting peripheral wall is used to connect and fix with the adapter. At least a portion of the first connecting peripheral wall overlaps with the adapter and is inserted into the inner side of the adapter, which helps to reduce flue gas leakage.

[0011] In some embodiments of this application, the adapter includes an adapter body and a second connecting peripheral wall. The second connecting peripheral wall is formed at a first end of the adapter body. The first snap-fit ​​portion is formed on the second connecting peripheral wall. A first connecting recess is formed between the first connecting peripheral wall and the first mating peripheral wall. The second connecting peripheral wall is connected to the first connecting recess.

[0012] The second connecting peripheral wall is snapped together with the first connecting peripheral wall to improve connection efficiency and facilitate operation. The second connecting peripheral wall is inserted into the first connecting recess so that the adapter and the check valve at least partially overlap, thereby improving the sealing effect of the connection and reducing the connection gap.

[0013] In some embodiments of this application, at least two first snap-fit ​​portions are provided at intervals along the periphery of the first connecting peripheral wall. Each first snap-fit ​​portion includes a connecting notch and a slot portion. Each connecting notch has an opening at the top. The slot portion communicates with the corresponding connecting notch and extends along the same rotation direction. The first snap-fit ​​portion is configured to connect to the connecting notch from top to bottom and rotate and snap into the slot portion.

[0014] The aforementioned structure of the first snap-fit ​​part and the first snap-lock part is simple to process and easy to operate, which helps to improve assembly and disassembly efficiency.

[0015] In some embodiments of this application, a second snap-fit ​​portion is formed on the adapter body, and a second latch portion is correspondingly provided on the outer wall of the flue guard ring, wherein the second latch portion and the second snap-fit ​​portion are detachably connected.

[0016] The adapter and the flue gas tube guard ring are detachably connected by a snap-fit ​​structure, which helps to improve assembly efficiency and facilitates assembly and disassembly.

[0017] In some embodiments of this application, at least two second snap-fit ​​portions are provided at intervals along the periphery of the adapter body. Each second snap-fit ​​portion includes a connection notch and a slot portion. Each connection notch has an opening at the top. The slot portion communicates with the corresponding connection notch and extends along the same rotation direction. The second snap-fit ​​portion is configured to connect to the connection notch from top to bottom and rotate and snap into the slot portion.

[0018] The number of the second snap-fit ​​part and the second snap-lock part is set to at least two, which helps to improve the connection stability. The above-mentioned structure of the second snap-fit ​​part and the second snap-lock part is simple to process and easy to operate, which helps to improve the efficiency of assembly and disassembly.

[0019] In some embodiments of this application, the adapter further includes a second mating peripheral wall, which is formed at the second end of the adapter body. The second mating peripheral wall is disposed radially along the inner side of the adapter body, and a second connecting recess is formed between the adapter body and the second mating peripheral wall. The smoke tube guard is connected in the second connecting recess.

[0020] The flue casing is inserted into the second connecting recess, and the adapter overlaps with the flue casing, improving the connection sealing effect and reducing flue gas leakage.

[0021] In some embodiments of this application, the radial dimension of the first docking peripheral wall is smaller than the radial dimension of the second docking peripheral wall, and at least two first locking notches are provided at intervals on the second docking peripheral wall.

[0022] When the reserved flue pipe size is larger than the air outlet size of the corresponding range hood's check valve, the radial dimension of the first connecting peripheral wall is smaller than the radial dimension of the second connecting peripheral wall. The first clamping notch causes the second connecting peripheral wall to retract inward during the process of connecting to the flue pipe guard ring. After connecting to the second connecting peripheral wall, the third connecting peripheral wall expands outward under its own restoring force, forming a tight connection with the flue pipe guard ring, thus improving the connection effect.

[0023] In some embodiments of this application, the radial dimension of the first docking peripheral wall is greater than the radial dimension of the second docking peripheral wall, and at least two second locking notches are provided at intervals on the first docking peripheral wall.

[0024] When the reserved flue pipe size is smaller than the air outlet size of the corresponding range hood's check valve, the radial dimension of the first connecting peripheral wall is larger than the radial dimension of the second connecting peripheral wall. The second locking notch causes the first connecting peripheral wall to retract inward during the process of connecting to the adapter. After connecting to the adapter, the first connecting peripheral wall expands outward under its own restoring force, forming a tight connection with the adapter and improving the connection effect.

[0025] In another aspect, this utility model also proposes a range hood, which includes the anti-reverse connection device involved in any of the above claims; in addition, the range hood further includes:

[0026] An outer casing, wherein a smoking cavity is formed within the outer casing;

[0027] A smoke exhaust pipe assembly, which has a smoke exhaust chamber that communicates with the smoking inner cavity;

[0028] A fan is detachably connected inside the smoke exhaust chamber;

[0029] The anti-reverse connection device is installed at the output end of the fan.

[0030] Compared with the prior art, the advantages and positive effects of this utility model are:

[0031] The anti-reverse connection device involved in this application has an adapter detachably connected to the anti-reverse valve. The first end of the adapter is detachably connected to the anti-reverse valve, and the second end of the adapter is detachably connected to the flue gas liner. The size of the first end of the adapter is adapted to the size of the air outlet end of the anti-reverse valve, and the size of the second end is adapted to the size of the flue gas liner. When the model of the range hood does not match the size of the reserved flue gas liner, the anti-reverse connection device can achieve a matching connection between the range hood and the flue gas liner, satisfying the user's unlimited range of range hood model selection, providing a good user experience, and ensuring good sealing between the replaced range hood and the flue gas liner, thus preventing smoke leakage.

[0032] Other features and advantages of this utility model will become clearer after reading the detailed embodiments of this utility model in conjunction with the accompanying drawings. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 This is an external view of one embodiment of the range hood proposed in this utility model;

[0035] Figure 2 This is an internal structural diagram of one embodiment of the range hood proposed in this utility model;

[0036] Figure 3 This is one of the structural diagrams of the anti-reverse connection device proposed in this utility model;

[0037] Figure 4 yes Figure 3 A split diagram of the anti-reverse connection device in the middle;

[0038] Figure 5 yes Figure 3 A structural diagram of the check valve in the anti-reverse connection device;

[0039] Figure 6 yes Figure 3 Structural diagram of the adapter component in the anti-reverse connection device;

[0040] Figure 7 This is the second structural diagram of the anti-reverse connection device proposed in this utility model;

[0041] Figure 8 yes Figure 7 A split diagram of the anti-reverse connection device in the middle;

[0042] Figure 9 yes Figure 7 A structural diagram of the check valve in the anti-reverse connection device;

[0043] Figure 10 yes Figure 7 Structural diagram of the adapter component in the anti-reverse connection device;

[0044] Figure 11 This is a diagram showing the anti-reverse connection device on a range hood.

[0045] In the picture,

[0046] 100. Outer shell;

[0047] 200. Smoke exhaust pipe assembly; 210. Central partition; 211. Smoke exhaust outlet;

[0048] 300. Fan;

[0049] 400. Anti-reverse connection device;

[0050] 410. Check valve; 411. Mounting base; 412. First connecting peripheral wall; 413. First mating peripheral wall; 414. First connecting recess; 415. First locking notch;

[0051] 420. Adapter; 421. Adapter body; 422. Second mating peripheral wall; 4221. Second locking notch; 423. Second connecting peripheral wall; 4231. First snap-fit ​​part; 424. Oil drain groove; 425. Second connecting recess;

[0052] 430. Smoke pipe guard ring; 431. Second buckle part;

[0053] 440. First snap-fit ​​part; 441. Connecting notch; 442. Slot part; 450. Second snap-fit ​​part. Detailed Implementation

[0054] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0055] It should be noted that in the description of this utility model, the terms "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," which indicate directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. These are merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0056] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0057] 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" 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.

[0058] The following disclosure provides many different embodiments or examples for implementing various structures of this invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0059] refer to Figure 1 , Figure 2This utility model proposes a reverse connection device 400 and a range hood. The range hood includes a housing 100, an exhaust pipe assembly 200 and a fan 300. The reverse connection device 400 is used to connect the air outlet of the fan 300 to the exhaust pipe.

[0060] refer to Figure 3 The backflow prevention device 400 includes a backflow prevention valve 410 and an adapter 420. The backflow prevention valve 410 is connected to the air outlet of the fan 300 to prevent flue gas from flowing back.

[0061] The adapter 420 is connected between the check valve 410 and the flue pipe. It is used to connect the range hood to the reserved flue pipe when the size of the reserved flue pipe does not match the size of the replacement range hood.

[0062] For example, when the diameter of the flue is smaller than the diameter of the air outlet of the check valve 410, such as, but not limited to, when the reserved flue diameter is 180mm and the air outlet diameter of the check valve 410 of the replaced range hood is 190mm, the flue and the check valve 410 are connected by an adapter 420 of the corresponding size.

[0063] Alternatively, when the diameter of the flue is larger than the diameter of the air outlet of the check valve 410, for example, but not limited to, when the flue diameter is 190mm and the air outlet diameter of the check valve 410 of the replaced range hood is 180mm, the flue and the check valve 410 are connected by an adapter 420 of the corresponding size.

[0064] The structure and connection method of the check valve 410 and the adapter 420 in the check valve connection device 400 will be described below:

[0065] refer to Figures 4-6 In some embodiments of this application, the check valve 410 and the adapter 420 are detachably connected by a snap-fit ​​connection.

[0066] The adapter 420 includes a first end and a second end. The first end of the adapter 420 is detachably connected to the check valve 410, and the second end is detachably connected to the flue pipe.

[0067] One end of the flue that connects to the range hood has a flue guard ring 430, and the second end is used for detachable connection with the flue guard ring 430.

[0068] The check valve 410 and the first end of the adapter 420 are fixed together by a snap-fit ​​connection.

[0069] A first snap-fit ​​portion 440 is provided on the outer wall of the check valve 410, and a first latch portion 4231 is formed on the outer wall of the first end of the adapter 420 for detachable connection with the first snap-fit ​​portion 440.

[0070] Specifically, in some embodiments of this application, the air outlet end of the check valve 410 is provided with a first connecting peripheral wall 412 and a first mating peripheral wall 413. Along the radial direction of the air outlet end of the check valve 410, the first mating peripheral wall 413 is located inside the first connecting peripheral wall 412, and a first snap-fit ​​portion 440 is formed on the first connecting peripheral wall 412.

[0071] In other words, both the first connecting peripheral wall 412 and the first docking peripheral wall 413 are annular, with the first connecting peripheral wall 412 located outside the first docking peripheral wall 413.

[0072] The height of the first mating peripheral wall 413 is greater than that of the first connecting peripheral wall 412. The first connecting peripheral wall 412 is used to connect and fix with the adapter 420. At least a portion of the first mating peripheral wall 413 overlaps with the adapter 420 and is inserted into the inner side of the adapter 420, which helps to reduce flue gas leakage.

[0073] In some embodiments of this application, the adapter 420 includes an adapter body 421 and a second connecting peripheral wall 423, the second connecting peripheral wall 423 being formed at a first end of the adapter body 421.

[0074] The adapter body 421 and the second connecting peripheral wall 423 are both annular structures. The adapter body 421 is located outside the second docking body. The second docking body extends towards the side closer to the check valve 410 relative to the adapter body 421, and is used to connect and fix with the first connecting peripheral wall 412 on the check valve 410.

[0075] The first latching part 4231 is formed on the second connecting peripheral wall 423, and the second connecting peripheral wall 423 is connected to the first latching part 440 of the first connecting peripheral wall 412 through the first latching part 4231.

[0076] A first connecting recess 414 is formed between the first connecting peripheral wall 412 and the first mating peripheral wall 413, and a second connecting peripheral wall 423 is connected within the first connecting recess 414.

[0077] The second connecting peripheral wall 423 is snapped together with the first connecting peripheral wall 412, which improves the connection efficiency and facilitates operation. The second connecting peripheral wall 423 is inserted into the first connecting recess 414 so that the adapter 420 and the check valve 410 at least partially overlap, thereby improving the sealing effect of the connection and reducing the connection gap.

[0078] In some embodiments of this application, at least two first snap-fit ​​portions 440 are provided at intervals along the periphery of the first connecting peripheral wall 412, and the position and number of the first snap-fit ​​portions 4231 correspond one-to-one with the first snap-fit ​​portions 440, so as to improve the stability of the connection between the first connecting peripheral wall 412 and the second connecting peripheral wall 423.

[0079] Each first snap-fit ​​portion 440 includes a connecting notch 441 and a slot portion 442. Each connecting notch 441 has an opening at the top, and the slot portion 442 communicates with the corresponding connecting notch 441 and extends along the same rotation direction.

[0080] In other words, the openings of each connecting notch 441 on the first snap-fit ​​portion 440 face the adapter 420, and the first snap-fit ​​portion 4231 is a protrusion formed on the second connecting peripheral wall 423.

[0081] During installation, the first latching part 4231 is configured to connect from top to bottom into the connecting notch 441 and rotate into the slot part 442.

[0082] The above-described structure of the first snap-fit ​​part 440 and the first snap-fit ​​part 4231 is simple to process and easy to operate, which helps to improve assembly and disassembly efficiency.

[0083] In some embodiments of this application, a second snap-fit ​​portion 450 is formed on the adapter body 421, and a second latching portion 431 is correspondingly provided on the outer wall of the flue guard ring 430. The second latching portion 431 and the second snap-fit ​​portion 450 are detachably connected.

[0084] The adapter 420 and the flue gas tube guard ring 430 are detachably connected by a snap-fit ​​structure, which helps to improve assembly efficiency and facilitates assembly and disassembly.

[0085] In some embodiments of this application, at least two second snap-fit ​​portions 450 are provided at intervals along the periphery of the adapter body 421. Each second snap-fit ​​portion 450 includes a connection notch 441 and a slot portion 442. Each connection notch 441 has an opening at the top, and the slot portion 442 communicates with the corresponding connection notch 441 and extends along the same rotation direction.

[0086] In other words, the direction of the connecting notch 441 on the second latching part 431 is towards the flue, and the second latching part 431 is configured to connect from top to bottom to the connecting notch 441 and rotate to latch into the slot part 442.

[0087] In other embodiments, in order to improve the stability of the connection between the adapter 420 and the shut-off valves and flue pipes at both ends, the slots 442 on the first snap-fit ​​portion 440 and the second snap-fit ​​portion 450 are designed to rotate in the same direction as the connection notch 441.

[0088] During installation, after the first latching part 4231 is connected to the connecting notch 441 on the first slot part 442 and the second latching part 431 is connected to the connecting notch 441 on the second slot part 442, rotating the adapter 420 can simultaneously connect the adapter 420 to the shut-off valve and the flue.

[0089] The number of the second snap-fit ​​part 450 and the second snap-fit ​​part 431 is at least two, which helps to improve the connection stability. The above-mentioned structure of the second snap-fit ​​part 450 and the second snap-fit ​​part 431 is simple to process and convenient to operate, which helps to improve the efficiency of assembly and disassembly.

[0090] In some embodiments of this application, the adapter 420 further includes a second mating peripheral wall 422, which is formed at the second end of the adapter body 421. The second mating peripheral wall 422 is disposed on the inner side of the adapter body 421 along the radial direction of the adapter body 421. A second connecting recess 425 is formed between the adapter body 421 and the second mating peripheral wall 422, and the smoke pipe guard ring 430 is connected in the second connecting recess 425.

[0091] The smoke pipe protective ring 430 is partially inserted into the second connecting recess 425, and the adapter 420 overlaps with the smoke pipe protective sleeve, which improves the connection sealing effect and reduces smoke leakage.

[0092] The dimensions of the first mating peripheral wall 413 and the inner wall of the adapter 420 are matched, and the dimensions of the second mating peripheral wall 422 are matched with the inner diameter of the flue pipe to avoid connection gaps.

[0093] In the specific assembly process, in order to improve the sealing effect, a sealing layer can be attached to the inner wall of the connection between the adapter 420, the check valve 410, and the flue pipe to further improve the sealing effect.

[0094] refer to Figures 8-10 In some embodiments of this application, an oil drain groove 424 is formed at the bottom of the second connecting recess 425. The oil drain groove 424 is used to connect the second connecting recess 425 with the oil collection box in the oil draining chamber, so as to drain the oil downward and prevent the oil from accumulating in the second connecting recess 425.

[0095] Similarly, an oil drain groove 424 is also formed at the bottom of the first connecting recess 414 to drain the oil in the first connecting recess 414 into the oil collection box.

[0096] Combination Figures 4-6 In some embodiments of this application, the radial dimension of the first docking peripheral wall 413 is smaller than the radial dimension of the second docking peripheral wall 422, and at least two first locking notches 415 are provided at intervals on the second docking peripheral wall 422.

[0097] When the reserved flue pipe size is larger than the air outlet size of the corresponding range hood's check valve 410, the radial dimension of the first mating peripheral wall 413 is smaller than the radial dimension of the second mating peripheral wall 422. The first locking notch 415 causes the second mating peripheral wall 422 to retract inward during the process of connecting to the flue pipe guard ring 430. After connecting to the second mating peripheral wall 422, the third connecting peripheral wall expands outward under its own restoring force, forming a tight connection with the flue pipe guard ring 430, thus improving the connection effect.

[0098] refer to Figures 8-10 In some embodiments of this application, the radial dimension of the first docking peripheral wall 413 is greater than the radial dimension of the second docking peripheral wall 422, and at least two second locking notches 4221 are provided on the first docking peripheral wall 413 at intervals.

[0099] That is, when the reserved flue pipe size is smaller than the air outlet size of the corresponding range hood's check valve 410, the radial dimension of the first connecting peripheral wall 413 is larger than the radial dimension of the second connecting peripheral wall 422. The second locking notch 4221 causes the first connecting peripheral wall 413 to retract inward during the process of connecting to the adapter 420. After connecting to the adapter 420, the first connecting peripheral wall 412 expands outward under its own restoring force, forming a tight connection with the adapter 420, thus improving the connection effect.

[0100] The oil drain groove 424 can be connected to the bottom of the first clamping notch 415 or the second clamping notch 4221, or it can be set up independently.

[0101] The anti-reverse connection device 400 involved in this application has an adapter 420 detachably connected to the anti-reverse valve 410. The first end of the adapter 420 is detachably connected to the anti-reverse valve 410, and the second end of the adapter 420 is detachably connected to the flue gas duct guard 430. The size of the first end of the adapter 420 is adapted to the size of the air outlet end of the anti-reverse valve 410, and the size of the second end is adapted to the size of the flue gas duct guard 430. When the model of the range hood does not match the size of the reserved flue gas duct, the anti-reverse connection device 400 can achieve a matching connection between the range hood and the flue gas duct, satisfying the user's unlimited range of range hood model selection, providing a good user experience, and ensuring good sealing between the replaced range hood and the flue gas duct, thus preventing smoke leakage.

[0102] refer to Figure 11 The outer casing 100 of the range hood involved in this application is located above the stove, and its back side is in contact with the wall. A smoke extraction cavity is formed inside the outer casing 100, a smoke exhaust cavity is formed inside the exhaust pipe assembly 200, and a fan 300 is installed inside the smoke exhaust cavity.

[0103] The exhaust chamber is connected to the smoke extraction chamber. When the fan is turned on at 300, the fumes are output through the smoke extraction chamber and the exhaust chamber with the airflow.

[0104] The fan 300 is a centrifugal fan 300, which is vertically installed in the smoke exhaust chamber, making the overall thickness of the range hood smaller and facilitating miniaturization.

[0105] The air inlet of the fan 300 is located on the side, and the air outlet is located on the top.

[0106] To prevent the air inlet of the fan 300 from being blocked by the side wall of the exhaust chamber, the fan 300 is detachably connected to the exhaust chamber at an angle via a support assembly. The side of the exhaust pipe assembly 200 away from the wall is the front wall, and the air inlet faces the front wall.

[0107] The smoke exhaust pipe assembly 200 is provided with a middle partition 210, and a smoke exhaust port 211 is formed on the middle partition 210. The exhaust end located at the top of the fan 300 is connected to the smoke exhaust port 211.

[0108] The check valve 410 is provided with a mounting base 411, which has fixing holes. Fastening screws and other fasteners are fixed to the smoke exhaust port 211 of the partition plate 210 through the fixing holes, so as to realize the connection between the smoke exhaust chamber and the check valve 410.

[0109] The check valve 410 has a check valve core inside, which enables the unidirectional transport of airflow from the exhaust chamber to the flue, preventing backflow of flue gas.

[0110] In the installed state, the bottom of the fan 300 is at a certain distance from the front wall, and the top of the fan 300 is tilted towards the front wall so that the air inlet end of the fan 300 forms an air inlet gap with the front wall.

[0111] An outlet for the smoke extraction chamber is provided on the upper part of the outer casing 100. The outlet is connected to the air inlet gap. The oil stains in the smoke extraction chamber are output from the outlet to the air inlet gap with the airflow, and enter the fan 300 from the air inlet end, and are output from the air outlet end to the downstream of the smoke exhaust chamber.

[0112] Currently, the range hoods on the market are available in two models based on their exhaust volume: one with a 180mm diameter exhaust pipe and the other with a 190mm diameter exhaust pipe. There are also two models of range hoods that match these pipes, namely the 410 anti-backflow valve with an exhaust port diameter of 180mm and 190mm.

[0113] Recombined Figures 3-6 Generally, for a range hood with a check valve 410 outlet port diameter of 180, the check valve 410 and adapter 420 configured to meet the following requirements:

[0114] The radial dimension of the first mating peripheral wall 413 on the check valve 410 is smaller than the radial dimension of the second mating peripheral wall 422 on the adapter 420.

[0115] At least two first locking notches 415 are provided at intervals on the second docking peripheral wall 422.

[0116] When the diameter of the flue pipe reserved indoors by the user is also 180mm, the adapter 420 can be removed, and the check valve 410 can be directly connected to the flue pipe size.

[0117] When the diameter of the flue pipe reserved in the user's room is 190, that is, when the reserved flue pipe size is larger than the size of the air outlet of the corresponding range hood's check valve 410, the radial dimension of the first connecting peripheral wall 413 is smaller than the radial dimension of the second connecting peripheral wall 422. The first clamping notch 415 causes the second connecting peripheral wall 422 to retract inward during the process of connecting to the flue pipe guard ring 430. After connecting to the second connecting peripheral wall 422, the third connecting peripheral wall expands outward under its own restoring force, forming a tight connection with the flue pipe guard ring 430.

[0118] Specifically, the diameter of the second connecting peripheral wall 422, that is, the radial dimension, needs to be adapted to the 190mm flue pipe, and the dimension of the second connecting peripheral wall 423 is adapted to the dimension of the 180mm check valve 410. The check valve 410 and the flue pipe are connected through the adapter 420.

[0119] Recombined Figures 7-10 For a range hood with a 190mm diameter air outlet port for the check valve 410, the check valve 410 and adapter 420 configured to meet the following requirements:

[0120] The radial dimension of the first mating peripheral wall 413 on the check valve 410 is greater than the radial dimension of the second mating peripheral wall 422 on the adapter 420.

[0121] When the diameter of the flue pipe reserved indoors by the user is also 190mm, the adapter 420 can be removed, and the check valve 410 can be directly connected to the flue pipe size.

[0122] When the diameter of the flue pipe reserved in the user's room is 180, the diameter of the flue pipe is smaller than the diameter of the air outlet port of the check valve 410 on the range hood.

[0123] That is, the radial dimension of the first mating peripheral wall 413 is greater than the radial dimension of the second mating peripheral wall 422, and at least two second locking notches 4221 are provided at intervals on the first mating peripheral wall 413 of the check valve 410.

[0124] When the reserved flue pipe size is smaller than the air outlet size of the corresponding range hood's check valve 410, the radial dimension of the first connecting peripheral wall 413 is larger than the radial dimension of the second connecting peripheral wall 422. The second locking notch 4221 causes the first connecting peripheral wall 413 to retract inward during the process of connecting to the adapter 420. After connecting to the adapter 420, the first connecting peripheral wall 412 expands outward under its own restoring force, forming a tight connection with the adapter 420, thus improving the connection effect.

[0125] Whenever possible, the various aspects and features described and shown in the specification can be applied individually, and these individual aspects can serve as the subject of a divisional application.

[0126] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0127] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions claimed by this utility model.

Claims

1. A reverse connection prevention device, characterized in that, include: A check valve is used to connect to the air outlet of a fan, and a first snap-fit ​​part is provided on the outer wall of the check valve; The adapter includes a first end and a second end. A first snap-fit ​​portion is formed on the outer wall of the first end, and the first snap-fit ​​portion is detachably connected to the first snap-fit ​​portion. The second end is used for detachable connection with the smoke pipe guard ring.

2. The anti-reverse connection device according to claim 1, characterized in that, The air outlet of the check valve is provided with a first connecting peripheral wall and a first mating peripheral wall. Along the radial direction of the air outlet of the check valve, the first mating peripheral wall is located inside the first connecting peripheral wall, and the first snap-fit ​​portion is formed on the first connecting peripheral wall.

3. The anti-reverse connection device according to claim 2, characterized in that, The adapter includes an adapter body and a second connecting peripheral wall. The second connecting peripheral wall is formed at a first end of the adapter body. The first snap-fit ​​portion is formed on the second connecting peripheral wall. A first connecting recess is formed between the first connecting peripheral wall and the first mating peripheral wall. The second connecting peripheral wall is connected to the first connecting recess.

4. The anti-reverse connection device according to claim 2, characterized in that, At least two first snap-fit ​​portions are provided at intervals along the periphery of the first connecting wall. Each first snap-fit ​​portion includes a connecting notch and a slot portion. Each connecting notch has an opening at the top. The slot portion communicates with the corresponding connecting notch and extends along the same rotation direction. The first snap-fit ​​portion is configured to connect to the connecting notch from top to bottom and rotate into the slot portion.

5. The anti-reverse connection device according to claim 3, characterized in that, The adapter body has a second snap-fit ​​part, and the outer wall of the flue guard ring is provided with a second buckle part. The second buckle part and the second snap-fit ​​part are detachably connected.

6. The anti-reverse connection device according to claim 5, characterized in that, At least two second snap-fit ​​portions are provided at intervals along the periphery of the adapter body. Each second snap-fit ​​portion includes a connection notch and a slot portion. Each connection notch has an opening at the top. The slot portion communicates with the corresponding connection notch and extends in the same direction. The second snap-fit ​​portion is configured to connect to the connection notch from top to bottom and rotate to snap into the slot portion.

7. The anti-reverse connection device according to claim 3, characterized in that, The adapter also includes a second mating peripheral wall, which is formed at the second end of the adapter body. The second mating peripheral wall is arranged radially along the inner side of the adapter body. A second connecting recess is formed between the adapter body and the second mating peripheral wall, and the smoke tube guard is connected in the second connecting recess.

8. The anti-reverse connection device according to claim 7, characterized in that, The radial dimension of the first docking peripheral wall is smaller than that of the second docking peripheral wall, and at least two first locking notches are provided at intervals on the second docking peripheral wall.

9. The anti-reverse connection device according to claim 7, characterized in that, The radial dimension of the first docking peripheral wall is larger than the radial dimension of the second docking peripheral wall, and at least two second locking notches are provided at intervals on the second docking peripheral wall.

10. A range hood, characterized in that, Including the anti-reverse connection device as described in any one of claims 1-9; In addition to the above, the range hood also includes: An outer casing, wherein a smoking cavity is formed within the outer casing; A smoke exhaust pipe assembly, which has a smoke exhaust chamber that communicates with the smoking inner cavity; A fan is detachably connected inside the smoke exhaust chamber; The anti-reverse connection device is installed at the output end of the fan.

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