A check device

Abstract

The utility model relates to range hood fittings technical field discloses a check device, it includes the casing, be equipped with the check piece on the casing, the check piece has first edge and second edge, oil guide groove is equipped on the check piece, and it includes the first flow surface and second flow surface that one side is connected, the other side is inclined to the opposite direction, and the both ends of flow groove extend to the first edge and the second edge respectively and communicate with the outside. The utility model has the advantages of reducing grease accumulation and simple structure, low production cost.

Description

Technical Field

[0001] This utility model relates to the technical field of range hood accessories, and in particular to a backflow prevention device. Background Technology

[0002] In existing kitchen exhaust systems, mechanical or electric check valves are typically installed at the exhaust vents of range hoods to prevent backflow of fumes and cross-contamination of odors from the shared exhaust duct. These check valves mainly consist of a valve body and a valve plate. When the range hood is running, most of the fumes are exhausted through the fume duct of the valve body, while some fumes accumulate as grease on the valve plate. This continuous accumulation of grease leads to two problems: first, the grease reduces the sealing performance of the valve plate, causing fumes and odors from the shared exhaust duct to seep back into the room; second, the difficulty and frequency of cleaning grease significantly increase, severely impacting the user experience. Utility Model Content

[0003] In view of the above-mentioned shortcomings of the existing technology, the technical problem to be solved by this utility model is to propose a check valve device that can reduce grease buildup, has a simple structure, and low production cost.

[0004] The technical solution adopted by this utility model to solve its technical problem is to provide a non-reverse check device, comprising:

[0005] A housing, wherein a backflow preventer is provided on the housing, the backflow preventer having a first edge and a second edge;

[0006] The guide channel is disposed on the anti-reverse plate and includes a first guide surface and a second guide surface that are connected on one side and inclined in opposite directions on the other side. The two ends of the guide channel extend to the first edge and the second edge respectively and communicate with the outside.

[0007] Furthermore, the guide channels are provided in several forms, arranged in a straight line or in a continuous arrangement.

[0008] Furthermore, the first edge and the second edge are arranged opposite to each other, and the length of the guide groove is equal to the straight-line distance between the first edge and the second edge.

[0009] Furthermore, the housing is provided with a through-hole air duct, and the anti-reverse plate is rotatably disposed in the air duct, and the anti-reverse plate has a first rotation position and a second rotation position; when the anti-reverse plate is in the first rotation position, the air duct can be opened; when the anti-reverse plate is in the second rotation position, the air duct can be closed, at which time the guide groove is perpendicular to the axis of the air duct.

[0010] Furthermore, it includes a drive assembly, which includes a drive member detachably disposed on the housing. The output end of the drive member is connected to the anti-reverse plate and can drive the anti-reverse plate to switch between the first rotational position and the second rotational position.

[0011] Furthermore, the anti-reverse plate includes a first mounting portion and a second mounting portion located on both sides of the guide groove. The output end of the drive member passes through the side wall of the housing and is detachably connected to the first mounting portion. The second mounting portion is detachably provided with a rotating shaft that is rotatably connected to the side wall of the housing.

[0012] Furthermore, it includes a limiting structure, which includes a first limiting member and a second limiting member located within the air duct, the extension lines of the first limiting member and the second limiting member being perpendicular to each other; when the anti-reverse plate rotates to the first rotation position, the first limiting member can restrict the anti-reverse plate from continuing to rotate in the original direction; when the anti-reverse plate rotates to the second rotation position, the second limiting member can restrict the anti-reverse plate from continuing to rotate in the original direction.

[0013] Furthermore, the first limiting member is detachably disposed on the inner wall of the housing, and when the anti-reverse plate rotates to the first rotation position, the first limiting member abuts against the anti-reverse plate. The second limiting member is welded to the anti-reverse plate, and when the anti-reverse plate rotates to the second rotation position, the second limiting member abuts against the inner wall of the housing.

[0014] Furthermore, a protective cover is detachably provided on the housing, which covers the drive component and encloses it.

[0015] Furthermore, it includes a sealing ring, which is disposed around the periphery of the check sheet.

[0016] Compared with the prior art, the present invention has at least the following beneficial effects:

[0017] 1. In this utility model, the check valve is provided with a guide groove, which includes a first guide surface and a second guide surface connected on one side and inclined in opposite directions on the other side. The two ends of the guide groove extend to the first edge and the second edge, respectively, and communicate with the outside. This design can effectively and quickly concentrate grease on the surface of the check valve to the bottom of the guide groove through the first and second guide surfaces, and discharge it through the edge of the check valve. This effectively avoids the accumulation of grease on the check valve, thereby ensuring the sealing performance of the check valve and reducing maintenance costs.

[0018] 2. In this invention, several guide channels are provided, arranged in a straight line or continuously. This design can cover a wider area, effectively collect grease from different locations, and significantly improve the overall oil guiding capacity.

[0019] 3. In this invention, the first edge and the second edge are arranged opposite to each other, and the length of the guide channel is equal to the straight-line distance between the first edge and the second edge. This design allows the guide channel to extend in a straight line, ensuring that the grease can flow smoothly to the edge for discharge under its guidance, avoiding the formation of grease residue areas. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the anti-reverse device of this utility model.

[0021] Figure 2 This is a partial structural schematic diagram of a backflow prevention device according to the present invention.

[0022] Figure 3 This is an exploded view of a partial structure of a backflow prevention device according to this utility model.

[0023] Figure 4 This is a schematic diagram of the structure of the reversing plate of this utility model.

[0024] In all the accompanying drawings, the same reference numerals denote the same technical features, specifically:

[0025] 100. Housing; 110. Air duct; 200. Anti-reverse plate; 201. First edge; 202. Second edge; 210. First mounting part; 220. Second mounting part; 300. Guide groove; 310. First guide surface; 320. Second guide surface; 400. Drive component; 410. Output end; 500. Rotating shaft; 600. Limiting structure; 610. First limiting component; 620. Second limiting component; 700. Protective cover; 800. Mounting plate; 900. Control board; 910. Socket hole. Detailed Implementation

[0026] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0027] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0028] Furthermore, in this utility model, the use of terms such as "first," "second," and "a" is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0029] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0030] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0031] like Figures 1 to 4 As shown, in this embodiment, a non-reverse check device includes:

[0032] The housing 100 is provided with a backstop plate 200, which has a first edge 201 and a second edge 202;

[0033] A flow guide 300 is provided on the check plate 200. It includes a first flow guide surface 310 and a second flow guide surface 320 connected on one side and inclined in opposite directions on the other. The two ends of the flow guide 300 extend to a first edge 201 and a second edge 202, respectively, and communicate with the outside. This design effectively and quickly concentrates grease on the surface of the check plate 200 through the first flow guide surface 310 and the second flow guide surface 320 to the bottom of the flow guide 300, and then discharges it through the edges of the check plate 200. This effectively prevents grease accumulation on the check plate 200, thereby ensuring the sealing performance of the check device and reducing maintenance costs.

[0034] Specifically, such as Figures 1 to 4As shown, in this embodiment, the backflow prevention device includes a housing 100, a backflow prevention plate 200, and a drive assembly. The backflow prevention plate 200 is rotatably disposed inside the housing 100, and the drive assembly is disposed outside the housing 100, capable of driving the backflow prevention plate 200 to rotate inside the housing 100, thereby opening or closing the air duct 110 of the housing 100, effectively preventing oil fumes in the public flue from flowing back into the room.

[0035] In this embodiment, the housing 100 has a hollow structure and a duct 110 extending through it along its axis. The cross-sectional dimensions of the duct 110 gradually increase along the axis to facilitate efficient exhaust of cooking fumes. Preferably, the housing 100 is made of plastic and injection molded, effectively reducing the production cost of the backflow prevention device.

[0036] In this embodiment, the anti-reverse plate 200 is rotatably disposed within the air duct 110, and the diameter of the anti-reverse plate 200 is slightly smaller than the diameter of the installation position of the air duct 110. This design, by placing the anti-reverse plate 200 within the air duct 110, effectively reduces the occupation of external space, making the overall structure of the anti-reverse device more compact.

[0037] In this embodiment, the anti-reverse slip 200 is circular, with a first edge 201 and a second edge 202 arranged in an arc shape and opposite to each other. This design allows the anti-reverse slip 200 to fit the shape of the air duct 110, ensuring that the anti-reverse slip 200 can better fit the inner wall of the air duct 110 in the closed state, thereby improving the sealing performance.

[0038] To further improve the sealing effect of the check plate 200, in this embodiment, a sealing ring (not shown in the figure) is also provided. The sealing ring is a rubber ring and is arranged around the periphery of the check plate 200.

[0039] To improve the oil guiding effect of the check valve 200, in this embodiment, the check valve 200 is provided with a guide groove 300. The guide groove 300 includes a first guide surface 310 and a second guide surface 320 connected on one side and inclined in opposite directions on the other, so that the guide groove 300 forms a V-shaped structure. Through the design of the V-shaped guide groove 300, grease on the surface of the check valve 200 can be efficiently concentrated and guided to the bottom of the guide groove 300 for rapid discharge through the edge, reducing grease accumulation and effectively avoiding problems such as poor sealing, incomplete opening and closing, and excessive cleaning frequency caused by grease buildup.

[0040] In this embodiment, the two ends of the guide channel 300 extend to the first edge 201 and the second edge 202 respectively and are connected to the outside. This design facilitates the flow of grease along the guide surface under the action of gravity and its rapid discharge, avoiding the accumulation of grease on the surface of the check plate 200, thereby improving cleaning performance. On the other hand, the through design of the two ends of the guide channel 300 also helps the airflow to pass smoothly during the smoke exhaust process, avoiding airflow disturbance or local pressure accumulation caused by structural closure or blind end setting.

[0041] In this embodiment, several guide channels 300 are provided and located in the middle area of ​​the check valve 200. The guide channels 300 are arranged in a straight line or continuously. This design can cover a larger area and effectively collect grease from different locations. Compared with the single-channel design, the multi-channel structure significantly improves the overall oil guiding capacity and further reduces the phenomenon of grease retention on the surface.

[0042] Preferably, in this embodiment, the multiple guide grooves 300 are arranged in a continuous line to give the middle area of ​​the anti-reverse plate 200 a wave-like structure. This design further ensures the compactness of the structure.

[0043] In this embodiment, the length of the guide groove 300 is equal to the straight-line distance between the first edge 201 and the second edge 202. That is, the guide groove 300 completely penetrates along the width direction of the anti-reverse plate 200, achieving full-width coverage from one edge to the other. This design makes the guide groove 300 extend in a straight line, ensuring that grease can flow smoothly to the edge for discharge under its guidance, avoiding the formation of oil accumulation blind spots.

[0044] In this embodiment, the anti-reverse slip 200 has a first rotational position and a second rotational position. When the anti-reverse slip 200 is in the first rotational position, it can open the air duct 110 to discharge oil fumes. When the anti-reverse slip 200 is in the second rotational position, it can close the air duct 110 to prevent oil fumes from flowing back in. At this time, the guide groove 300 is perpendicular to the axis of the air duct 110. That is, the guide groove 300 is arranged vertically, so that the grease inside the guide groove 300 can flow smoothly along its length under the action of gravity, and finally be discharged to the outside through the second edge 202 set at the bottom. This design not only realizes reliable opening and closing control of the air duct 110, but also makes full use of the physical principle of gravity to enable grease to be discharged efficiently.

[0045] In this embodiment, the first rotation position is the position after the reversing plate 200 has rotated 90° from a vertical position around its own axis, and the second rotation position is the position after the reversing plate 200 has rotated 90° from a horizontal position around its own axis. When the reversing plate 200 is in the first rotation position, the reversing device is in the open state; when the reversing device is in the second rotation position, the reversing device is in the closed state.

[0046] In this embodiment, the anti-reverse plate 200 includes a first mounting portion 210 and a second mounting portion 220 located on both sides of the guide groove 300. Both the first mounting portion 210 and the second mounting portion 220 are semi-circular and arranged opposite each other, and each has a through mounting hole. The first mounting portion 210 is used for connection to the drive component 400, and the second mounting portion 220 is used for mounting the rotating shaft 500. This design not only ensures that the anti-reverse plate 200 can rotate smoothly within the air duct 110, but also guarantees the convenience of disassembly, assembly, and maintenance of the anti-reverse device.

[0047] In this embodiment, a rotating shaft 500 is detachably provided on the second mounting part 220. One end of the rotating shaft 500 is rotatably embedded in the side wall of the housing 100, and the other end is detachably connected to the second mounting part 220 by bolts. This design can work with the driving component 400 to drive the anti-reverse plate 200 to rotate, further ensuring the stability of the rotation of the anti-reverse plate 200.

[0048] In this embodiment, the driving assembly includes a driving member 400 detachably mounted on the outer wall of the housing 100. The output end 410 of the driving member 400 is connected to the anti-reverse plate 200 and can drive the anti-reverse plate 200 to switch between a first rotational position and a second rotational position. This design realizes the electric control opening and closing function of the anti-reverse device, which not only improves the response speed but also provides basic support for subsequent intelligent operation. In addition, the detachable design of the driving member 400 further ensures the convenience of disassembly, assembly, and maintenance.

[0049] In this embodiment, the drive member 400 is disposed on the side wall of the outer side of the housing 100, and the output end 410 of the drive member 400 passes through the side wall of the housing 100 and is detachably connected to the first mounting part 210 by bolts. This design not only ensures that the drive member 400 can accurately control the rotation of the anti-reverse plate 200, but also provides great convenience for the installation and maintenance of the anti-reverse device.

[0050] Preferably, in this embodiment, the drive component 400 is a rotary motor.

[0051] In this embodiment, the drive assembly includes a mounting plate 800, which is bolted to the outside of the drive member 400, serving as a support and fixing structure for the drive member 400. This design not only enhances the installation stability of the drive member 400 but also provides better stability and ease of maintenance for the entire anti-reverse device.

[0052] In this embodiment, the drive member 400 is fixed to the mounting plate 800 by bolts, and the mounting plate 800 has a through hole through which the output end 410 of the drive member 400 passes.

[0053] To ensure that the anti-reverse slip 200 accurately reaches the preset position during rotation, a limiting structure 600 is provided in this embodiment. This limiting structure 600 includes a first limiting member 610 and a second limiting member 620 disposed within the air duct 110. The extension lines of the first limiting member 610 and the second limiting member 620 are perpendicular to each other. When the anti-reverse slip 200 rotates to the first rotation position, the first limiting member 610 restricts the anti-reverse slip 200 from continuing to rotate in the original direction. When the anti-reverse slip 200 rotates to the second rotation position, the second limiting member 620 restricts the anti-reverse slip 200 from continuing to rotate in the original direction. The first limiting member 610 and the second limiting member 620 correspond to the two extreme positions of the anti-reverse slip 200, ensuring that the anti-reverse slip 200 stops precisely with each rotation, achieving precise control and effective limitation of the rotation angle of the anti-reverse slip 200. This design effectively improves the stability and reliability of the anti-reverse device during the opening and closing process.

[0054] In this embodiment, the first limiting member 610 is cylindrical and is detachably and horizontally inserted into the inner wall of the housing 100. When the anti-reverse plate 200 rotates to the first rotation position, the first limiting member 610 abuts against the surface of the first mounting portion 210 of the anti-reverse plate 200. At this time, the output terminal 410 of the drive member 400 generates a sudden current change due to the reverse resistance. The controller determines that the anti-reverse plate 200 has reached the limit position based on the signal and controls the drive member 400 to stop working.

[0055] In this embodiment, the second limiting member 620 is L-shaped and welded to the bottom position corresponding to the center line of the anti-reverse plate 200. When the anti-reverse plate 200 rotates to the second rotation position, the second limiting member 620 abuts against the housing 100. At this time, the driving member 400 also generates a current change due to obstruction, and the controller recognizes the positioning state and stops the driving action accordingly. The L-shaped design of the second limiting member 620 can expand the contact surface and ensure the stability of the second limiting member 620 in fixing and limiting.

[0056] Preferably, in this embodiment, the horizontal segment of the second limiting member 620 extending beyond the edge of the anti-reverse plate 200 has a length of 3-5 mm. This design ensures that the second limiting member 620 achieves a stable limiting effect while preventing interference between the second limiting member 620 and the anti-reverse plate 200 when the anti-reverse plate 200 has not rotated to the second rotation position.

[0057] In this embodiment, a protective cover 700 is detachably provided on the housing 100. The protective cover 700 covers the drive component 400 and encloses the drive component 400. This design not only protects the drive component 400, but also integrates the protective cover 700 into the appearance of the anti-reverse device, allowing the drive component to be hidden inside and improving the overall neatness of the product design.

[0058] To achieve linkage with the opening and closing of the range hood, in this embodiment, the drive assembly also includes a control board 900. The control board 900 has a built-in circuit board (not shown in the figure) that is electrically connected to the drive component 400, and the control board 900 has a socket hole 910 that is electrically connected to the circuit board for connecting the power line of the range hood, and driving the drive component 400 to rotate forward or reverse according to the opening and closing of the range hood.

Claims

1. A non-reverse flow prevention device, characterized in that, include: A housing, wherein a backflow preventer is provided on the housing, the backflow preventer having a first edge and a second edge; The guide channel is disposed on the anti-reverse plate and includes a first guide surface and a second guide surface that are connected on one side and inclined in opposite directions on the other side. The two ends of the guide channel extend to the first edge and the second edge respectively and communicate with the outside.

2. The anti-reverse device according to claim 1, characterized in that, The flow guide grooves are provided in several forms, arranged in a straight line or in a continuous arrangement.

3. The anti-reverse device according to claim 1, characterized in that, The first edge and the second edge are arranged opposite to each other, and the length of the guide groove is equal to the straight-line distance between the first edge and the second edge.

4. The anti-reverse device according to claim 1, characterized in that, The housing is provided with a through-hole air duct, and the anti-reverse plate is rotatably disposed in the air duct, and the anti-reverse plate has a first rotation position and a second rotation position; when the anti-reverse plate is in the first rotation position, the air duct can be opened; when the anti-reverse plate is in the second rotation position, the air duct can be closed, at which time the guide groove is perpendicular to the axis of the air duct.

5. A check valve according to claim 4, characterized in that, The device includes a drive assembly, which includes a drive member detachably mounted on the housing. The output end of the drive member is connected to the anti-reverse plate and can drive the anti-reverse plate to switch between a first rotational position and a second rotational position.

6. A check valve according to claim 5, characterized in that, The anti-reverse plate includes a first mounting portion and a second mounting portion located on both sides of the guide groove. The output end of the drive component passes through the side wall of the housing and is detachably connected to the first mounting portion. The second mounting portion is detachably provided with a rotating shaft that is rotatably connected to the side wall of the housing.

7. A check valve according to claim 4, characterized in that, The device includes a limiting structure, which comprises a first limiting member and a second limiting member located within the air duct, wherein the extension lines of the first limiting member and the second limiting member are perpendicular to each other; when the anti-reverse plate rotates to the first rotation position, the first limiting member can restrict the anti-reverse plate from continuing to rotate in the original direction; when the anti-reverse plate rotates to the second rotation position, the second limiting member can restrict the anti-reverse plate from continuing to rotate in the original direction.

8. A check valve according to claim 7, characterized in that, The first limiting member is detachably disposed on the inner wall of the housing, and when the anti-reverse plate rotates to the first rotation position, the first limiting member abuts against the anti-reverse plate. The second limiting member is welded to the anti-reverse plate, and when the anti-reverse plate rotates to the second rotation position, the second limiting member abuts against the inner wall of the housing.

9. A check valve according to claim 5, characterized in that, The housing is detachably provided with a protective cover, which covers the drive component and encloses it.

10. A check valve according to claim 1, characterized in that, Includes a sealing ring, which is disposed around the periphery of the check plate.

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