CN221221461U - Electric check valve and range hood - Google Patents

Abstract

The utility model relates to the technical field of range hoods and discloses an electric check valve and a range hood, wherein the electric check valve comprises a valve body, a valve block assembly and a driving device, an air duct is arranged in the valve body, the valve body is provided with an axle hole, the valve block assembly is rotationally arranged in the air duct, the driving device is arranged on the valve body, a rotating shaft of the driving device is rotationally arranged in the axle hole and is connected with the valve block assembly, and the driving device is used for driving the valve block assembly to rotate so as to open or close the air duct of the valve body; the valve block subassembly includes valve block and sealing washer, and the valve block links to each other with drive arrangement's pivot, and the sealing washer sets up in the circumference of valve block to can with the inner wall butt of valve body, be provided with on the sealing washer and dodge the structure, dodge the structure and enclose the circumference outside of locating the shaft hole, and with the inner wall butt of valve body, thereby avoid because drive arrangement's pivot and the emergence of the clearance that causes tiny leakage between the shaft hole, prevent that the range hood from appearing the condition of crossing smell.

Description

Electric check valve and range hood

Technical Field

The utility model relates to the technical field of range hoods, in particular to an electric check valve and a range hood.

Background

In order to solve the problems of dirty air flowing backward, odor and the like in public exhaust ducts of high-rise houses, electric check valves are arranged on smoke exhaust pipelines of many smoke exhaust hoods. The electric check valve product on the market at present mainly comprises a butterfly valve with simple and reliable structure, and the butterfly valve sealing mode is the best mode of interference fit sealing between a valve plate peripheral sealing ring and the inner wall of the valve body, but the sealing mode has the problem of odor tainting easily due to the existence of assembly errors and fit gaps at the shaft hole.

Disclosure of utility model

The utility model aims to provide an electric check valve and a range hood, which solve the technical problem that in the prior art, the sealing mode shaft hole of a sealing ring of the electric check valve is easy to cause odor mixing due to assembly errors and fit gaps.

To achieve the purpose, the utility model adopts the following technical scheme:

The present utility model provides an electric check valve comprising: the valve comprises a valve body, a valve block assembly and a driving device, wherein an air channel is arranged in the valve body, the valve body is provided with an axle hole, the valve block assembly is rotationally arranged in the air channel, the driving device is arranged on the valve body, a rotating shaft of the driving device is rotationally arranged in the axle hole and is connected with the valve block assembly, and the driving device is used for driving the valve block assembly to rotate so as to open or close the air channel of the valve body;

The valve block assembly comprises a valve block and a sealing ring, the valve block is connected with a rotating shaft of the driving device, the sealing ring is arranged in the circumferential direction of the valve block and can be abutted against the inner wall of the valve body, an avoidance structure is arranged on the sealing ring, and the avoidance structure is arranged on the outer side of the circumferential direction of the shaft hole in a surrounding mode and is abutted against the inner wall of the valve body.

The driving device of the electric check valve drives the valve plate to rotate in the valve body so as to open or close the air duct of the valve body, the valve plate of the valve plate assembly is connected with the rotating shaft of the driving device, the sealing ring of the circumference of the valve plate is propped against the inner wall of the valve body, the avoidance structure is arranged on the circumference outside of the shaft hole in a surrounding mode and propped against the inner wall of the valve body, and therefore tiny leakage gaps caused by fit gaps between the rotating shaft of the driving device and the shaft hole are avoided, and odor tainting is avoided.

As a preferable scheme of the electric check valve, the avoidance structure is an arc structure.

Dodge the structure and be arc structure, dodge the outside that the structure can enclose to locate the shaft hole, promptly with the pivot of drive arrangement with the clearance dislocation set in shaft hole, avoid appearing the smell of mixing, this simple structure is convenient for prepare.

As a preferred scheme of the electric check valve, the shaft hole comprises a driving shaft hole and a driven shaft hole, the driving shaft hole and the driven shaft hole are oppositely arranged, the driving shaft hole penetrates through the side wall of the valve body, the driven shaft hole is formed in the inner wall of the valve body, a driving shaft of the driving device stretches into and rotates to be arranged in the driving shaft hole, a driven shaft of the driving device rotates to be arranged in the driven shaft hole, and the valve plate assembly is respectively connected with the driving shaft and the driven shaft.

Through the cooperation of driving shaft and initiative shaft hole, the cooperation of driven shaft and driven shaft, valve block subassembly links to each other with driving shaft and driven shaft respectively, realizes the smooth rotation of valve block subassembly.

As a preferable scheme of the electric check valve, two avoidance structures are arranged on the sealing ring, one of the avoidance structures is arranged on the outer side of the periphery of the driving shaft hole in a surrounding mode, and the other avoidance structure is arranged on the outer side of the periphery of the driven shaft hole in a surrounding mode.

The arrangement can avoid the leakage clearance generated by the fit clearance between the driving shaft hole and the driving shaft and the fit clearance between the driven shaft hole and the driven shaft.

As a preferable scheme of the electric check valve, the sealing ring and the avoidance structure are integrally formed.

The sealing ring and the avoiding structure are integrally formed, so that the formed structure is simple and the preparation is easy; and the number of parts is reduced, assembly is not needed, and the working efficiency is improved.

As a preferable scheme of the electric check valve, two ends of the valve body are respectively provided with an air inlet and an air outlet which are communicated with the air duct, one end of the valve body, which is provided with the air outlet, is detachably provided with an adapter, and the adapter is communicated with the valve body.

The one end that is provided with the air outlet of valve body can be dismantled and be provided with the adaptor, can make things convenient for the installation of tuber pipe or valve member through the adaptor, and the adaptor can be dismantled and set up moreover, can realize the dismouting of adaptor and change and maintain.

As a preferable mode of the electric check valve, the diameter of the adapter gradually increases or gradually decreases from one end connected to the valve body to the other end.

The arrangement enables the adapter to be suitable for installation of air pipes or valve members with different sizes, and interface matching and convenience of the electric check valve are improved.

As a preferable mode of the electric check valve, the wall thickness of the adapter is gradually increased from one end connected with the valve body to the other end; or alternatively

The wall thickness of the adapter piece is gradually reduced from one end connected with the valve body to the other end.

The wall thickness of the connecting piece is gradually increased from one end connected with the valve body to the other end, and after shearing according to the requirements, the weight of the rest materials of the adapter piece is reduced, so that the installation of the adapter piece and the air pipe or the valve piece is facilitated;

The wall thickness of the connecting piece is gradually thinned from one end connected with the valve body to the other end so as to facilitate shearing according to requirements, and the shearing is labor-saving.

As a preferable mode of the electric check valve, the adapter is engaged with the valve body.

The adapter is clamped with the valve body, so that the adapter is convenient to assemble and disassemble.

The utility model also provides a range hood, which comprises a range hood main body and the electric check valve connected with the range hood main body.

The range hood can realize the discharge of oil smoke through the electric check valve, avoid the backward flow of the oil smoke and avoid the situation of odor tainting.

The utility model has the beneficial effects that:

According to the electric check valve provided by the utility model, the driving device of the electric check valve drives the valve plate to rotate in the valve body so as to open or close the air duct of the valve body, the valve plate of the valve plate assembly is connected with the rotating shaft of the driving device, the sealing ring in the circumferential direction of the valve plate is propped against the inner wall of the valve body, the avoiding structure is arranged on the circumferential outer side of the shaft hole in a surrounding manner and propped against the inner wall of the valve body, and therefore, tiny leakage gaps caused by fit gaps between the rotating shaft of the driving device and the shaft hole are avoided, and odor tainting is avoided.

According to the range hood provided by the utility model, through the electric check valve, the discharge of oil smoke can be realized, the backward flow of the oil smoke is avoided, and the situation of odor tainting is avoided.

Drawings

FIG. 1 is a schematic view of an electric check valve according to the present utility model;

FIG. 2 is a front view of the electric check valve provided by the present utility model;

FIG. 3 is a side view of the electrically operated check valve provided by the present utility model;

FIG. 4 is a cross-sectional view taken along line A-A of FIG. 3;

FIG. 5 is another cross-sectional view of the electrically operated check valve provided by the present utility model;

FIG. 6 is a schematic view of a valve plate assembly according to the present utility model;

FIG. 7 is a schematic diagram II of a valve plate assembly according to the present utility model;

FIG. 8 is a schematic diagram III of a valve plate assembly according to the present utility model;

FIG. 9 is a partial cross-sectional view of the valve body, valve plate assembly, driven shaft of the electric check valve provided by the present utility model mated;

FIG. 10 is a partial cross-sectional view of the valve body, valve plate assembly cooperation of the electric check valve provided by the present utility model.

FIG. 11 is a schematic view of an adaptor according to the present utility model;

FIG. 12 is a front view of an adapter provided by the present utility model;

FIG. 13 is a side view of an adapter provided by the present utility model;

Fig. 14 is a cross-sectional view of fig. 13 taken along line B-B.

In the figure:

1. a valve body; 12. an air inlet; 13. an air outlet; 131. a driving shaft hole; 132. a driven shaft hole;

2. an adapter; 21. a connecting ring; 22. a connection part; 23. a buckle;

3. A valve plate assembly; 31. a valve plate; 311. a fixing hole; 32. a seal ring; 33. an avoidance structure;

4. A driving device; 41. a driving shaft; 42. and a driven shaft.

Detailed Description

The utility model is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present utility model are shown in the drawings.

In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", etc. orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the utility model. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.

In order to solve the problems of dirty air flowing backward, odor and the like in public exhaust ducts of high-rise houses, electric check valves are arranged on smoke exhaust pipelines of many smoke exhaust hoods. The electric check valve product on the market at present mainly comprises a butterfly valve with simple and reliable structure, and the butterfly valve sealing mode is the best by adopting the interference fit sealing mode of the valve plate peripheral sealing ring and the valve body inner wall, but the shaft hole of the sealing mode is easy to cause tiny leakage clearance due to assembly errors and fit clearance, so that the problem of odor tainting is caused.

In order to solve the above problems, as shown in fig. 1-8, the embodiment provides an electric check valve, which comprises a valve body 1, a valve block assembly 3 and a driving device 4, wherein an air channel is arranged in the valve body 1, a shaft hole is arranged on the valve body 1, the valve block assembly 3 is rotationally arranged in the air channel, the driving device 4 is arranged on the valve body 1, a rotating shaft of the driving device 4 is rotationally arranged in the shaft hole and is connected with the valve block assembly 3, and the driving device 4 is used for driving the valve block assembly 3 to rotate so as to open or close the air channel of the valve body 1, thereby realizing exhaust of oil smoke and backflow prevention. The valve block subassembly 3 includes valve block 31 and sealing washer 32, and valve block 31 links to each other with the pivot of drive arrangement 4, and sealing washer 32 sets up in the circumference of valve block 31 to can with the inner wall looks butt in valve body 1, be provided with on the sealing washer 32 and dodge structure 33, dodge structure 33 and enclose the circumference outside of locating the shaft hole, and with the inner wall looks butt in valve body 1, thereby avoid because the cooperation clearance between drive arrangement 4 pivot and the shaft hole leads to the appearance of little leakage clearance, avoid the smell of linking.

Specifically, as shown in fig. 4, the shaft hole includes a driving shaft hole 131 and a driven shaft hole 132, the driving shaft hole 131 and the driven shaft hole 132 are disposed opposite to each other, the driving shaft hole 131 is disposed through a side wall of the valve body 1, the driven shaft hole 132 is disposed on an inner wall of the valve body 1, the driving shaft 41 of the driving device 4 extends into and is rotatably disposed in the driving shaft hole 131, and the driven shaft 42 of the driving device 4 is rotatably disposed in the driven shaft hole 132 (see fig. 9); the valve plate assembly 3 is connected to a driving shaft 41 and a driven shaft 42, respectively. In the present embodiment, the driving shaft hole 131 and the driven shaft hole 132 are vertically symmetrically arranged. The valve plate 31 can rotate around the vertical axis through the arrangement, and the influence of the gravity of the valve plate 31 on the rotation of the valve plate 31 is avoided.

In this embodiment, as shown in fig. 6-8, two avoidance structures 33 are provided, where the two avoidance structures 33 are disposed at equal intervals along the circumferential direction of the sealing ring 32, one of the avoidance structures 33 covers the circumferential outer side of the driving shaft hole 131 (see fig. 4), and the other avoidance structure 33 covers the circumferential outer side of the driven shaft hole 132 (see fig. 4, 9 and 10), so that a leakage gap can be avoided due to a fit gap between the driving shaft hole 131 and the driving shaft 41 and a fit gap between the driven shaft hole 132 and the driven shaft 42.

Preferably, as shown in fig. 6, 9 and 10, the avoiding structure 33 is an arc structure, and can be wrapped outside the shaft hole, so that the gap between the rotating shaft of the driving device 4 and the shaft hole can be effectively avoided, and the smell can be avoided. In other embodiments, the avoidance structure 33 is not limited to an arc structure, and may be a cover structure of other shapes, as long as it is capable of being dislocated with the gap between the rotation shaft of the driving device 4 and the shaft hole.

Preferably, the sealing ring 32 and the avoidance structure 33 are integrally formed, in this embodiment, the sealing ring 32 and the avoidance structure 33 are integrally formed through vulcanization or injection molding, so that the structure is simple, and the preparation is easy; and the number of parts is reduced, assembly is not needed, and the working efficiency is improved.

As shown in fig. 6 and 7, the valve plate 31 is provided with a fixing hole 311, and the fixing member passes through the fixing hole 311 to be connected with the rotating shaft of the driving device 4. The valve plate 31 is connected with the rotating shaft of the driving device 4 through the cooperation of the fixing hole 311 and the fixing piece, and the connection mode is simple and convenient and has better connection strength. In this embodiment, the fixing holes 311 are provided in two groups, each group includes two fixing holes 311, the valve plate 31 is connected to the driving shaft 41 through the two fixing holes 311 and two fixing members, and the valve plate 31 is connected to the driven shaft 42 through the two fixing holes 311 and two fixing members, thereby enhancing the connection strength. It should be noted that, the connection between the valve plate 31 and the driving shaft 41 is not limited to the connection between the two fixing holes 311 and the two fixing members, and may be adjusted according to the requirement. The connection between the valve plate 31 and the driven shaft 42 is not limited to the connection between the two fixing holes 311 and the two fixing members, and can be adjusted according to the requirement.

In order to facilitate the connection of the rotating shaft of the driving device 4 and the valve plate 31, a plane is usually cut out in the rotating shaft so as to be convenient for the fitting installation with the valve plate 31, in addition, a groove for avoiding the sealing ring 32 is further arranged in the rotating shaft, so that the end part of the rotating shaft forms a step structure, the step structure and the shaft hole form a fault fall to easily form a leakage gap, the structure setting of the avoidance structure 33 can form a dislocation setting with the leakage gap, the sealing effect is achieved, the oil smoke is prevented from flowing back from the leakage gap, and the odor mixing condition is avoided.

As shown in fig. 1, 2, 4 and 5, two ends of the valve body 1 are respectively provided with an air inlet 12 and an air outlet 13 which are communicated with the air duct, one end of the valve body 1 provided with the air outlet 13 is provided with an adapter piece 2, the adapter piece 2 is communicated with the valve body 1, and the caliber of the adapter piece 2 is gradually increased or gradually reduced from one end connected with the valve body 1 to the other end so as to adapt to the installation of air pipes or valve pieces with different sizes, and the interface matching performance and convenience of the electric check valve are improved.

As shown in fig. 11 to 14, the adapter 2 includes a plurality of connection rings 21, and two adjacent connection rings 21 are connected by a connection portion 22, in this embodiment, the diameter of each connection ring 21 gradually increases in the axial direction of the valve body 1 toward a direction away from the valve body 1. The adaptor 2 comprises a plurality of connecting rings 21, two adjacent connecting rings 21 are connected through a connecting part 22 to form an integral structure, and the connecting rings 21 can adapt to the installation of air pipes or valve members with different sizes due to different calibers. In other embodiments, the diameter of each connecting ring 21 gradually decreases in the axial direction of the valve body 1 toward a direction away from the valve body 1.

Alternatively, as shown in fig. 12 and 14, the connection portion 22 is of a ring-shaped structure or a horn-shaped structure. The connecting part 22 is of an annular structure, so that the structure is simple and the preparation is convenient; the connecting part 22 has a horn-shaped structure so as to gradually change the caliber between two adjacent connecting rings 21, thereby further improving the adaptability with the air pipe or the valve. In this embodiment, the connection portion 22 between two adjacent connection rings 21 near one end of the air outlet 13 of the valve body 1 is in a ring structure, and the connection portion 22 between two adjacent connection rings 21 far from one end of the air outlet 13 of the valve body 1 is in a horn structure, so as to better adapt to the connection of the air pipe or the valve member.

As shown in fig. 14, the wall thickness of the adaptor 2 is gradually reduced from one end connected with the valve body 1 to the other end so as to facilitate shearing according to requirements, and the shearing is labor-saving. In other embodiments, the wall thickness of the adaptor 2 may be gradually increased from one end connected to the valve body 1 to the other end, and when the adaptor 2 is sheared according to the requirement, the weight of the rest materials of the adaptor 2 is reduced, so that the adaptor is convenient to be installed with an air pipe or a valve; of course, the wall thickness of the adapter 2 can be consistent, so that the adapter is convenient to prepare and the manufacturing cost is reduced.

With continued reference to fig. 14, in this embodiment, the adaptor 2 includes 4 connection rings 21, two adjacent connection rings 21 are connected by a connection portion 22, and for convenience of description, the 4 connection rings 21 are named as a first connection ring, a second connection ring, a third connection ring, and a fourth connection ring in order, where the diameter of the first connection ring is Φa, the diameter of the second connection ring is Φb, the diameter of the third connection ring is Φc, and the diameter of the fourth connection ring is Φd, where Φa < Φb < Φc < Φd. The wall thickness of the first connecting ring, the second connecting ring, the third connecting ring and the fourth connecting ring is sequentially increased, the wall thickness of the first connecting ring is t1, the wall thickness of the fourth connecting ring is t2, t1 is more than t2, t1 is preferably consistent with the wall thickness of the valve body 1, the strength phase adaptation of the valve body 1 can be realized, the thickness of t2 is preferably 0.6mm, the adaptor 2 is easy to carry out injection molding, and the adaptor 2 is easy to carry out on-site shearing according to an air pipe or a valve matched with an interface during installation. In other embodiments, the number of the connection rings 21 is not limited to 4, but may be 2,3, 5 or more.

Not only the wall thicknesses of the first, second, third, and fourth connection rings increase in order, but also the wall thickness of the connection portion 22 increases in order from one end near the valve body 1 to the other end, and the wall thickness of the entire adapter 2 increases in order from one end connected to the valve body 1 to the other end.

Optionally, the adaptor 2 is clamped with the valve body 1, so that the adaptor 2 is convenient to assemble and disassemble. As shown in fig. 11 and 12, one of the adapter 2 and the valve body 1 is provided with a buckle 23, and the other of the adapter 2 and the valve body 1 is provided with a clamping hole clamped with the buckle 23. The matching of the buckle 23 and the clamping hole realizes the clamping connection of the adapter 2 and the valve body 1, and has simple structure and convenient preparation. In this embodiment, the buckle 23 is disposed in the circumference of the adapter 2, the clamping holes are disposed in the circumference of the valve body 1, a plurality of buckles 23 are uniformly disposed in the circumference of the adapter 2, a plurality of clamping holes are disposed in the circumference of the valve body 1, and the buckles 23 are in one-to-one clamping fit with the clamping holes. The adaptor 2 is stably mounted on the valve body 1 by the cooperation of a plurality of uniformly arranged buckles 23 and clamping holes. In other embodiments, the clip 23 may be disposed in the circumferential direction of the valve body 1, and the clip hole may be disposed in the circumferential direction of the adapter 2.

In this embodiment, as shown in fig. 13, four buckles 23 are disposed on the circumferential outer wall of the adapter 2, the four buckles 23 are disposed at equal intervals along the circumferential direction of the adapter 2, 4 clamping holes are uniformly disposed in the circumferential direction of the valve body 1, and the four buckles 23 are in one-to-one fit with the four clamping holes, so that stable connection between the adapter 2 and the valve body 1 is realized. In other embodiments, the number of the buckles 23 is not limited to 4, but may be 2, 3, 5 or more, which is not particularly limited herein. It should be noted that: the specific structures of the buckle 23 and the clamping hole are not particularly limited, and the adaptor 2 and the valve body 1 can be conveniently assembled and disassembled as long as the clamping of the buckle 23 and the clamping hole can be realized.

The embodiment also provides a range hood, which comprises a range hood main body and the electric check valve connected with the range hood main body. The range hood can realize the discharge of oil smoke through the electric check valve, avoid the backward flow of the oil smoke and avoid the situation of odor tainting; and the mounting of tuber pipe or valve member of different sizes can also be adapted to, the interface matching nature and the convenience of electronic check valve have been promoted, the commonality of part has been improved, have reduced the manufacturing cost of range hood.

It is to be understood that the above examples of the present utility model are provided for clarity of illustration only and are not limiting of the embodiments of the present utility model. Various obvious changes, rearrangements and substitutions can be made by those skilled in the art without departing from the scope of the utility model. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the utility model are desired to be protected by the following claims.

Claims (10)

1. An electric check valve, comprising: the valve comprises a valve body (1), a valve block assembly (3) and a driving device (4), wherein an air channel is arranged in the valve body (1), the valve body (1) is provided with an axle hole, the valve block assembly (3) is rotatably arranged in the air channel, the driving device (4) is arranged on the valve body (1), a rotating shaft of the driving device (4) is rotatably arranged in the axle hole and is connected with the valve block assembly (3), and the driving device (4) is used for driving the valve block assembly (3) to rotate so as to open or close the air channel of the valve body (1);

Valve block subassembly (3) are including valve block (31) and sealing washer (32), valve block (31) with the pivot of drive arrangement (4) links to each other, sealing washer (32) set up in the circumference of valve block (31), and can with the inner wall looks butt of valve body (1), be provided with on sealing washer (32) and dodge structure (33), dodge structure (33) enclose and locate the circumference outside in shaft hole, and with the inner wall looks butt of valve body (1).

2. The electric check valve according to claim 1, characterized in that the relief structure (33) is an arc-shaped structure.

3. The electric check valve according to claim 1, wherein the shaft hole comprises a driving shaft hole (131) and a driven shaft hole (132), the driving shaft hole (131) and the driven shaft hole (132) are oppositely arranged, the driving shaft hole (131) penetrates through the side wall of the valve body (1), the driven shaft hole (132) is arranged on the inner wall of the valve body (1), a driving shaft (41) of the driving device (4) stretches into and rotates in the driving shaft hole (131), a driven shaft (42) of the driving device (4) rotates in the driven shaft hole (132), and the valve plate assembly (3) is connected with the driving shaft (41) and the driven shaft (42) respectively.

4. An electric check valve according to claim 3, characterized in that two avoidance structures (33) are provided on the seal ring (32), one of the avoidance structures (33) is arranged around the peripheral outer side of the driving shaft hole (131), and the other avoidance structure (33) is arranged around the peripheral outer side of the driven shaft hole (132).

5. The electric check valve according to claim 1, characterized in that the sealing ring (32) is integrally formed with the relief structure (33).

6. The electric check valve according to any one of claims 1-5, characterized in that both ends of the valve body (1) are respectively provided with an air inlet (12) and an air outlet (13) which are communicated with the air duct, one end of the valve body (1) provided with the air outlet (13) is detachably provided with an adapter (2), and the adapter (2) is communicated with the valve body (1).

7. An electric non-return valve according to claim 6, characterized in that the caliber of the adapter (2) increases or decreases gradually from one end connected to the valve body (1) to the other.

8. The electric non-return valve according to claim 7, wherein the wall thickness of the adapter (2) gradually increases from one end connected to the valve body (1) to the other; or alternatively

The wall thickness of the adapter (2) is gradually reduced from one end connected with the valve body (1) to the other end.

9. The electric non-return valve according to claim 6, wherein the adapter (2) is snapped into engagement with the valve body (1).

10. A range hood comprising a range hood body and an electrically operated check valve according to any one of claims 1 to 9 connected to the range hood body.