Check valve and range hood

Abstract

The utility model belongs to the technical field of range hoods, and particularly discloses a check valve and a range hood. The check valve comprises an inner shell, an outer shell and a silencing material. The outer shell comprises a first shell and a second shell, and opposite first ends of the first shell and the second shell are rotationally connected with the inner shell; the opposite second ends of the first shell and the second shell are detachably connected, or the opposite second ends of the first shell and the second shell are detachably connected with the inner shell; the first outer shell and the second outer shell are mutually enclosed to form a containing space, the inner shell is installed in the containing space, and the silencing material is arranged between the inner shell and the outer shell. According to the check valve, the disassembly and assembly efficiency of the check valve can be improved, and the silencing material between the inner shell and the outer shell can be replaced and maintained conveniently.

Description

Technical Field

[0001] The utility model relates to the technical field of range hoods, in particular to a check valve and a range hood. Background Art

[0002] A range hood is a kitchen appliance that exhausts cooking fumes outdoors, purifying the kitchen environment and reducing the harmful effects of fumes on the human body. The range hood exhausts fumes into a common flue through a check valve and flue pipe. High resistance in the common flue causes airflow to gather at the check valve and swirl, generating considerable noise.

[0003] In order to solve the problem of loud noise, a check valve with noise reduction function is used in the prior art to solve the above problem. The check valve includes an outer shell, an inner shell and a sound-absorbing material arranged between the inner shell and the outer shell. The sound-absorbing material reduces the noise generated when the smoke is discharged through the check valve. The installation of the check valve is usually to directly cover the outer shell on the outer side of the inner shell. When the sound-absorbing material in the check valve needs to be replaced and maintained, the outer shell needs to be removed from the inner shell before the sound-absorbing material can be replaced and maintained. After the replacement and maintenance are completed, the outer shell needs to be put back on. However, since the inner side of the outer shell of the check valve is sticky with oil during use, the installation of the outer shell will be hindered by the oil, which makes it difficult to install or replace the sound-absorbing material. Therefore, it is inconvenient to install or replace the sound-absorbing material, which is not conducive to improving work efficiency. Utility Model Content

[0004] One of the technical problems solved by the present invention is to provide a check valve, which can effectively solve the problem of inconvenient disassembly, assembly and replacement of silencer materials in the check valve, thereby improving work efficiency.

[0005] The second technical problem solved by the present invention is to provide a range hood, which can effectively solve the problem of inconvenient disassembly and assembly of the silencer material in the check valve in the range hood.

[0006] The first technical problem mentioned above is solved by the following technical solution:

[0007] A check valve comprises an inner housing and a check assembly mounted on the inner housing, the check valve further comprising:

[0008] The outer shell includes a first outer shell and a second outer shell, wherein first ends of the first outer shell and the second outer shell are rotatably connected to the inner shell; second ends of the first outer shell and the second outer shell are detachably connected, or second ends of the first outer shell and the second outer shell are detachably connected to the inner shell, and the first outer shell and the second outer shell can be enclosed with each other to form a storage space, and the inner shell is installed in the storage space;

[0009] The sound-absorbing material is arranged between the outer shell and the inner shell.

[0010] Compared with the background technology, the check valve of the present invention has the following beneficial effects:

[0011] The check valve provided by the present invention facilitates assembly and replacement of the sound-absorbing material by dividing the outer shell into a first outer shell and a second outer shell, that is, the first outer shell and the second outer shell can be aligned and connected. Furthermore, the first end of the first outer shell and the first end of the second outer shell are both rotatably connected to the inner shell, and the second end of the first outer shell and the second end of the second outer shell are detachably connected or both are detachably connected to the inner shell. That is, when the sound-absorbing material needs to be replaced, it is only necessary to disassemble the first and second outer shells and rotate them relative to the first end to open them, without having to remove the entire outer shell during the disassembly process. After the sound-absorbing material is replaced, the first and second outer shells rotate in opposite directions to enclose and connect the second end of the first and second outer shells. This makes the disassembly and assembly of the check valve easier, improves the disassembly and assembly efficiency, facilitates the replacement and maintenance of the sound-absorbing material, and can be completed without the assistance of others. At the same time, due to the significant difference in the structure of the rotating connection and the detachable connection, it is more convenient to position and dock during the installation process to avoid assembly errors.

[0012] In one embodiment, the first end of the first shell and the first end of the second shell are both rotatably connected to the outer side wall of the inner shell; the second end of the first shell and the second end of the second shell are detachably connected.

[0013] In one embodiment, two rotating connecting plates are provided at intervals on the outer side wall of the inner shell along the axial direction of the accommodating space;

[0014] The outer side wall of the first end of the first shell and the outer side wall of the first end of the second shell are both provided with a rotating part rotatably connected between the two rotating connecting plates.

[0015] In one embodiment, each of the rotating connecting plates is provided with two connecting holes;

[0016] The rotating parts on the first shell and the second shell each include two rotating pins arranged along the axial direction of the accommodating space, the two rotating pins of the first shell are respectively rotatably connected to the two corresponding connecting holes on the two rotating connecting plates, and the two rotating pins of the second shell are respectively rotatably connected to the other two corresponding connecting holes on the two rotating connecting plates.

[0017] In one embodiment, the second end of the first shell and the second end of the second shell are snap-connected, and one of the second ends of the first shell and the second end of the second shell has a snap-connecting piece on its outer side wall, and the other has a plug-in hole on its outer side wall, and the snap-connecting piece and the plug-in hole are snap-connected.

[0018] In one embodiment, a protrusion is provided on the outer side wall of the other of the second end of the first shell and the second end of the second shell, and the plug hole is provided on the protrusion.

[0019] In one embodiment, the clamping member includes a plug rod and a clamping protrusion provided on the plug rod, the plug rod is inserted into the plug hole, and the clamping protrusion is located at an end of the protrusion block away from the plug rod.

[0020] In one embodiment, the outer shell and the inner shell clamp the sound-absorbing material.

[0021] In one embodiment, a connecting ring is further included. An annular connecting portion is provided on one end of the outer wall of the inner shell along the axial direction of the accommodating space, and the connecting ring is used to connect the annular connecting portion and the smoke pipe.

[0022] The annular connecting portion includes a middle annular vertical plate connected to one end of the inner shell, the middle annular vertical plate is provided with a clamping groove, and the clamping groove includes an entry groove and a limit groove that are interconnected and arranged at an angle;

[0023] The outer side wall of the connecting ring is provided with a boss, which enters through the entry groove and is limited in the limiting groove;

[0024] A groove wall surface of the limiting groove is provided with a ridge, and the ridge can abut against the boss.

[0025] The second technical problem mentioned above is solved by the following technical solution:

[0026] A range hood comprises a range hood body, a smoke pipe and the check valve described in any one of the above schemes, wherein the check valve is installed at the smoke outlet of the range hood body, and the smoke pipe is connected to the check valve.

[0027] Compared with the background technology, the range hood of the present invention has the following beneficial effects:

[0028] The utility model also provides a range hood. By arranging the above-mentioned check valve at the smoke outlet of the range hood body, the efficiency of disassembly and assembly of the check valve can be improved, and the replacement and maintenance of the silencer material between the inner shell and the outer shell are facilitated. The smoke pipe is connected to the range hood body through the check valve, making the installation of the smoke pipe more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A schematic diagram of the check valve structure provided by an embodiment of the utility model;

[0030] Figure 2 An exploded view of a check valve provided in an embodiment of the utility model;

[0031] Figure 3 for Figure 2 A magnified view of the structure at point A;

[0032] Figure 4 for Figure 2 A magnified view of the structure at B in the middle;

[0033] Figure 5 for Figure 2 A magnified view of the structure at C in the middle;

[0034] Figure 6 This is a schematic structural diagram of the inner shell involved in an embodiment of the present utility model;

[0035] Figure 7 for Figure 6 A magnified view of the structure at D in the middle;

[0036] Figure 8 A schematic diagram of the structure of the connection between the check valve and the smoke pipe provided in an embodiment of the utility model;

[0037] Figure 9 for Figure 8 A magnified view of the structure at E in the middle;

[0038] Figure 10 This is a schematic structural diagram of a connecting ring involved in an embodiment of the present utility model.

[0039] Description of labels:

[0040] 100, tobacco pipe;

[0041] 1. Inner housing; 11. Rotating connecting plate; 111. Connecting hole; 12. Annular connecting portion; 121. Middle annular vertical plate; 1211. Entry slot; 1212. Limiting slot; 1212a. Raised ridge; 122. Inner annular vertical plate; 123. Outer annular vertical plate; 13. Mounting plate; 14. Horizontal connecting rod; 141. Anti-return plate;

[0042] 2. First housing; 21. Rotation pin; 22. Protrusion; 221. Insertion hole;

[0043] 3. Second housing; 31. Connecting rod; 311. Snap-fit protrusion; 3111. Chamfered surface;

[0044] 4. Sound-absorbing materials;

[0045] 5. Connecting ring; 51. Boss; 52. Dial plate; 53. Annular limit plate. DETAILED DESCRIPTION

[0046] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0047] In the description of this application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0048] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. Throughout this application, unless otherwise specified, "plurality" means two or more.

[0049] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0050] The present embodiment provides a check valve and a range hood. The range hood includes a range hood body, a check valve, and a smoke duct 100. The check valve is located at the smoke outlet of the range hood body. One end of the smoke duct 100 is connected to the check valve, while the other end is connected to a public flue or the outside world. By installing the check valve provided in this embodiment at the smoke outlet of the range hood body, the range hood effectively improves the efficiency of disassembly and assembly of the check valve, facilitating replacement and maintenance of the sound-absorbing material between the inner and outer shells. Furthermore, the smoke duct 100 is connected to the range hood body via the check valve, making installation of the smoke duct 100 even more convenient.

[0051] The following is combined with Figures 1-10 Let's explain the check valve in detail.

[0052] The check valve of the present invention comprises an inner housing 1, an outer housing, and a sound-absorbing material 4. The inner housing 1 houses a check assembly. The outer housing comprises a first housing 2 and a second housing 3. The first and second housings 2 and 3 have opposing first ends that are rotatably connected to the inner housing 1, while their second ends are detachably connected. Alternatively, the first and second housings 2 and 3 have opposing first ends that are rotatably connected to the inner housing 1, while their second ends are detachably connected to the outer wall of the inner housing 1.

[0053] like Figure 1-Figure 2 As shown, in this embodiment, the first and second opposing ends of the first and second shells 2, 3 are both rotatably connected to the outer wall of the inner shell 1. The second opposing ends of the first and second shells 2, 3 are detachably connected. When the first and second shells 2, 3 are interlocked, they form a storage space, and the inner shell 1 is installed within the storage space. It is understood that the inner shell 1 can be partially or completely located within the storage space. Sound-absorbing material 4 is disposed between the inner shell 1 and the outer shell. Alternatively, the sound-absorbing material 4 can be disposed on the inner sidewall of the outer shell, or on the outer sidewall of the inner shell.

[0054] The check valve is divided into a first shell 2 and a second shell 3, making assembly and replacement of the sound-absorbing material 4 more convenient. The first shell 2 and the second shell 3 can be aligned and connected. Furthermore, the first end of the first shell 2 and the first end of the second shell 3 are rotatably connected and fixed to the inner shell 1 or both are rotatably connected to the inner shell 1, and the second end of the first shell 2 and the second end of the second shell 3 are detachably connected or both are detachably connected to the inner shell 1. That is, when the sound-absorbing material 4 needs to be replaced, it is only necessary to remove the second end of the first shell 2 and the second shell 3 and rotate them relative to the first end to open, without having to remove the entire outer shell during assembly and disassembly. After the sound-absorbing material 4 is replaced, the first shell 2 and the second shell 3 rotate in opposite directions to enclose and connect the second end of the first shell 2 and the second end of the second shell 3. This makes the disassembly and assembly of the check valve simpler, improves disassembly and assembly efficiency, facilitates replacement and maintenance of the sound-absorbing material 4, and can be completed without the assistance of others. At the same time, due to the significant difference in the structure of the rotational connection and the detachable connection, it is more convenient to position and dock during installation to avoid assembly errors.

[0055] Optionally, the inner side walls of the first shell 2 and the second shell 3 are both provided with sound-absorbing material 4. By setting the outer shell body as the first shell 2 and the second shell 3, it is more convenient to install the sound-absorbing material 4 on the inner side walls of the first shell 2 and the second shell 3.

[0056] The outer shell and inner shell 1 clamp the sound-absorbing material 4. By providing a split outer shell, the sound-absorbing material 4 can be clamped between the outer shell and inner shell 1 during installation, completely filling the gap between the outer shell and inner shell 1, thereby achieving a better noise reduction effect. In the prior art installation method where the outer shell is encased within the inner shell, there is a risk of damage to the sound-absorbing material 4 due to excessive friction when the sound-absorbing material 4 is clamped between the outer shell and inner shell 1.

[0057] In this embodiment, a plurality of through holes are provided in the inner shell 1. The first and second shells 2, 3 are both made of hard plastic (e.g., engineering PP). The sound-absorbing material 4 includes, but is not limited to, a soft damping material bonded to the inner sidewalls of the first and second shells 2, 3. The soft damping material is made of butyl rubber or nitrile rubber and has high damping properties, effectively reducing the vibration of the sound source and achieving the purpose of reducing noise.

[0058] Specifically, the first end of the first shell 2 and the first end of the second shell 3 are both rotatably connected to the outer wall of the inner shell 1, and the second end of the first shell 2 and the second end of the second shell 3 are detachably connected. This structural design is simple, and the first and second shells 2, 2 can be fixed to the inner shell while being rotatably connected to the outer wall of the inner shell, eliminating the need for other fixing methods to the inner shell, thereby making assembly and disassembly more convenient.

[0059] Optionally, two rotating connecting plates 11 are provided at intervals on the outer wall of the inner shell 1 along the direction of the axis of the accommodating space (the same as the direction of the axis of the inner shell 1), and the outer wall of the first end of the first shell 2 and the outer wall of the first end of the second shell 3 are both provided with a rotating part rotatably connected between the two rotating connecting plates 11, so that the first shell 2 and the second shell 3 are more conveniently rotatably connected to the inner shell 1.

[0060] Furthermore, if Figure 6 Combined with Figure 3As shown, each rotating connecting plate 11 is provided with two connecting holes 111; the rotating parts on the first shell 2 and the second shell 3 each include two rotating pins 21. Along the axial direction of the accommodating space, the outer side wall of the first end of the first shell 2 and the outer side wall of the first end of the second shell 3 are provided with two rotating pins 21 spaced apart. The two rotating pins 21 of the first shell 2 are symmetrically arranged and are respectively rotatably connected to the two corresponding connecting holes 111 on the two rotating connecting plates 11. The two rotating pins 21 of the second shell 3 are symmetrically arranged and are respectively rotatably connected to the other two corresponding connecting holes 111 on the two rotating connecting plates 11, so as to achieve the rotational connection between the first shell 2 and the second shell 3 and the inner shell 1. Compared with the structure of directly connecting the first shell 2 and the second shell 3 to the inner shell 1 through the same rotating shaft, this method of providing the first shell 2 and the second shell 3 with rotating pins 21 and connecting them to the connecting holes 111 on the inner shell 1 avoids the need for adding a separate rotating shaft component, making the overall structure more simplified.

[0061] Optionally, the rotating pin 21 can be set to a stepped structure, and the smaller diameter part of the rotating pin 21 is inserted into the corresponding connecting hole 111, and the rotating connecting plate 11 can abut against the larger diameter part of the rotating pin 21 to limit the rotating pin 21 from falling out.

[0062] Alternatively, as Figure 4-Figure 5 Combined with Figure 8-Figure 9 As shown, one of the second ends of the first shell 2 and the second end of the second shell 3 has a snap-fit member provided on its outer wall, while the other has a raised block 22 provided on its outer wall. The raised block 22 has an insertion hole 221. When the first shell 2 and the second shell 3 are rotated and fastened together, the snap-fit member can be snapped into the insertion hole 221, thereby connecting the second ends of the first shell 2 and the second shell 3, making the opening and fastening of the first shell 2 and the second shell 3 more convenient. Furthermore, compared to a structure in which both the first shell 2 and the second shell 3 are detachably connected to the inner shell 1, this structure avoids the need for additional snap-fit structures on the inner shell 1, simplifying the structure of the inner shell 1 and reducing production costs.

[0063] In order to ensure that the first shell 2 and the second shell 3 are firmly connected, the connecting part includes a plug rod 31 and a plug protrusion 311 provided on the plug rod 31. When the plug rod 31 is inserted into the plug hole 221, the plug protrusion 311 passes through the plug hole and is limited to the end of the protrusion block 22 away from the plug rod 31.

[0064] In order to facilitate the locking protrusion 311 to pass through the insertion hole 221, the outer edge of the locking protrusion 311 is provided with a chamfered surface 3111. When the plug rod 31 is plugged into the insertion hole 221, the chamfered surface 3111 can facilitate the locking boss 51 and the plug rod 31 to be inserted into the insertion hole 221.

[0065] Optionally, the plug rods 31 correspond to the protruding blocks 22 one by one and two are arranged at intervals along the axial direction of the accommodating space. The two plug rods 31 are respectively plugged into the plug holes 221 on the two protruding blocks 22, making the plugging more secure.

[0066] In order to facilitate the connection between the check valve and the smoke pipe 100 , an annular connecting portion 12 is provided at one end of the inner shell 1 along the axial direction of the accommodating space. The annular connecting portion 12 is connected to the smoke pipe 100 via a connecting ring 5 .

[0067] Further, refer to Figures 6-10 As shown, the annular connecting portion 12 includes a middle annular vertical plate 121 connected to one end of the inner shell 1, and the middle annular vertical plate 121 is provided with a snap-in groove, which includes an entry groove 1211 and a limit groove 1212 that are interconnected and arranged at an angle (can be a 90° angle); the outer wall of the connecting ring 5 is provided with a boss 51. When the connecting ring 5 is connected to the annular connecting portion 12, the connecting ring 5 is inserted into the middle annular vertical plate 121, and the boss 51 is inserted into the entry groove 1211 and then the connecting ring 5 is rotated. The boss 51 can enter the limit groove 1212, so that the boss 51 is snap-fitted into the limit groove 1212, thereby realizing the snap-fit connection between the connecting ring 5 and the annular connecting portion 12, and the installation is convenient.

[0068] Furthermore, a groove wall surface of the limiting groove 1212 is provided with a ridge 1212 a. When the boss 51 is engaged with the limiting groove 1212 , the ridge 1212 a can abut against the boss 51 to ensure a firm engagement.

[0069] Optionally, the snap-fit grooves and bosses 51 correspond one to one and are each provided in plurality. The plurality of bosses 51 can be snap-fitted into the limiting grooves 1212 of the plurality of snap-fit grooves respectively, so as to make the connection between the connecting ring 5 and the annular connecting portion 12 more stable.

[0070] In order to facilitate the rotation of the connecting ring 5, the outer wall of the connecting ring 5 is provided with a dial plate 52. The operator can facilitate the rotation of the connecting ring 5 by dialing the dial plate 52. Further, a plurality of dial plates 52 can be provided at intervals to make the operation more convenient.

[0071] Optionally, an annular limiting plate 53 is provided on the outer side wall of the connecting ring 5 , and the shift plate 52 is connected to the annular limiting plate 53 and the outer side wall of the connecting ring 5 , so that the structural design is more reasonable.

[0072] Furthermore, the annular connecting portion 12 also includes an inner annular vertical plate 122 arranged in the middle annular vertical plate 121, the connecting ring 5 is inserted between the middle annular vertical plate 121 and the inner annular vertical plate 122, and the annular limiting plate 53 is supported on the middle annular vertical plate 121 and the inner annular vertical plate 122, so that the connecting ring 5 is installed more stably.

[0073] In order to facilitate the connection between the rotating connecting plate 11 and the outer wall of the inner shell 1, the annular connecting part 12 also includes an outer annular vertical plate 123 surrounded by the middle annular vertical plate 121. A mounting plate 13 is provided on the outer side wall of one end of the inner shell 1 facing away from the annular connecting part 12. One rotating connecting plate 11 is provided on the outer annular vertical plate 123, and the other rotating connecting plate 11 is provided on the mounting plate 13.

[0074] It can be understood that the annular connecting portion 12 also includes an annular transverse plate, an annular support plate is arranged on the outer side wall of one end of the inner shell 1, and the outer annular vertical plate 123, the middle annular vertical plate 121 and the inner annular vertical plate 122 are all arranged on the annular transverse plate.

[0075] In this embodiment, Figure 6 Combined with Figure 1 As shown, the anti-return assembly includes two anti-return plates 141, and the inner side wall of the inner annular vertical plate 122 is provided with a horizontal connecting rod 14. The horizontal connecting rod 14 divides the inner annular vertical plate 122 into two semicircles. Two anti-return plates 141 are symmetrically provided on the horizontal connecting rod 14. The two anti-return plates 141 can respectively block the two semicircles in a natural state. When the range hood is exhausting smoke, the two anti-return plates 141 can rotate and open under the action of the smoke to discharge the smoke.

[0076] In the specific contents of the above-mentioned specific implementation methods, the various technical features can be combined in any non-contradictory manner. In order to make the description concise, not all possible combinations of the above-mentioned technical features are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0077] The specific contents of the above-mentioned specific embodiments only express several embodiments of the present invention. Although the description is relatively specific and detailed, it should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be based on the appended claims.

Claims

1. A check valve comprising an inner housing (1) and a check assembly mounted on the inner housing (1), characterized in that: The check valve further comprises: An outer shell, comprising a first outer shell (2) and a second outer shell (3), wherein first ends of the first outer shell (2) and the second outer shell (3) opposite to each other are both rotatably connected to the inner shell (1); The second ends of the first shell (2) and the second shell (3) opposite to each other are detachably connected, or the second ends of the first shell (2) and the second shell (3) opposite to each other are detachably connected to the inner shell (1), and the first shell (2) and the second shell (3) can be enclosed with each other to form a receiving space, and the inner shell (1) is installed in the receiving space; A sound-absorbing material (4) is provided between the outer shell and the inner shell (1).

2. The check valve according to claim 1, characterized in that: The first end of the first shell (2) and the first end of the second shell (3) are both rotatably connected to the outer side wall of the inner shell (1); the second end of the first shell (2) and the second end of the second shell (3) are detachably connected.

3. The check valve according to claim 2, characterized in that: Two rotating connecting plates (11) are provided at intervals on the outer side wall of the inner shell (1) along the axial direction of the accommodating space; The outer side wall of the first end of the first shell (2) and the outer side wall of the first end of the second shell (3) are both provided with a rotating portion rotatably connected between the two rotating connecting plates (11).

4. The check valve according to claim 3, characterized in that: Each of the rotating connecting plates (11) is provided with two connecting holes (111); The rotating parts on the first shell (2) and the second shell (3) each include two rotating pins (21) arranged along the axial direction of the accommodating space, the two rotating pins (21) of the first shell (2) are respectively rotatably connected to the two corresponding connecting holes (111) on the two rotating connecting plates (11), and the two rotating pins (21) of the second shell (3) are respectively rotatably connected to the other two corresponding connecting holes (111) on the two rotating connecting plates (11).

5. The check valve according to claim 2, characterized in that: The second end of the first shell (2) and the second end of the second shell (3) are snap-fitted; one of the second end of the first shell (2) and the second end of the second shell (3) has a snap-fitting piece provided on its outer wall, and the other has a plug-in hole (221) provided on its outer wall; the snap-fitting piece and the plug-in hole (221) are snap-fitted.

6. The check valve according to claim 5, characterized in that: A protruding block (22) is provided on the outer side wall of the other of the second end of the first shell (2) and the second end of the second shell (3), and the plug hole (221) is provided on the protruding block (22).

7. The check valve according to claim 6, characterized in that: The clamping member comprises a plug rod (31) and a clamping protrusion (311) provided on the plug rod (31); the plug rod (31) is plugged into the plug hole (221); and the clamping protrusion (311) is located at an end of the protruding block (22) facing away from the plug rod (31).

8. The check valve according to claim 1, characterized in that: The outer shell and the inner shell (1) clamp the sound-absorbing material (4).

9. The check valve according to any one of claims 1 to 8, characterized in that: It also includes a connecting ring (5), an annular connecting portion (12) is provided on one end of the outer wall of the inner shell (1) along the axial direction of the accommodating space, and the connecting ring (5) is used to connect the annular connecting portion (12) and the smoke pipe (100); The annular connecting portion (12) comprises a middle annular vertical plate (121) connected to one end of the inner shell (1); the middle annular vertical plate (121) is provided with a snap-fitting groove, and the snap-fitting groove comprises an entry groove (1211) and a limiting groove (1212) that are interconnected and arranged at an angle; The outer side wall of the connecting ring (5) is provided with a boss (51), and the boss (51) enters through the entry groove (1211) and is limited in the limiting groove (1212); A groove wall surface of the limiting groove (1212) is provided with a ridge (1212a), and the ridge (1212a) can abut against the boss (51).

10. A range hood, characterized in that: The smoke hood comprises a smoke hood body, a smoke pipe (100) and a check valve according to any one of claims 1 to 9, wherein the check valve is installed at the smoke outlet of the smoke hood body, and the smoke pipe (100) is connected to the check valve.

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