Anti-backflow structure of range hood

Abstract

The utility model relates to range hood technical field, and disclose a kind of anti-backflow structure of range hood, including smoke exhaust duct, anti-backflow component and initiative sealing component;The one end of smoke exhaust duct is communicated with the smoke outlet of range hood, and the other end is used to be communicated with public flue or outdoor;The anti-backflow component is set in the inside of smoke exhaust duct, including fixed frame, movable sealing plate and elastic reset piece.The anti-backflow structure of this range hood, through the synergic effect of anti-backflow component and initiative sealing component, realizes double sealing guarantee, when fan is closed, electric push rod extends and pushes movable sealing plate and presses tight sealing, simultaneously elastic reset piece provides auxiliary sealing force, effectively prevent the oil smoke backflow in public flue, this design not only solves the problem of single check valve poor sealing performance, also avoids the phenomenon that valve is jammed due to oil stain attachment, significantly improves the reliability and durability of anti-backflow structure.

Description

Technical Field

[0001] This utility model relates to the field of range hood technology, and more specifically to an anti-backflow structure for a range hood. Background Technology

[0002] Range hoods are commonly used kitchen fume purification devices. They use a fan to create negative pressure, drawing in cooking fumes and expelling them through exhaust ducts to a shared ventilation duct or outdoors. However, in actual use, when the range hood stops working, fumes in the shared ventilation duct can easily flow back into the room through the exhaust duct, causing kitchen air pollution and affecting the living environment and human health.

[0003] Existing range hoods often employ a single check valve to prevent backflow, which is closed by gravity or a spring. However, this type of structure suffers from poor sealing performance. After long-term use, the valve is prone to jamming due to grease buildup, resulting in incomplete closure. At the same time, a single mechanical seal is insufficient to withstand the positive pressure in the shared flue, and oil fume leakage can still occur.

[0004] Therefore, it is necessary to design a reliable, non-stick anti-backflow structure for range hoods to address the shortcomings of existing technologies. Utility Model Content

[0005] In order to overcome the above-mentioned defects of the prior art, the present invention provides an anti-backflow structure for a range hood to solve the problems existing in the background art.

[0006] This utility model provides the following technical solution: an anti-backflow structure for a range hood, comprising an exhaust pipe, an anti-backflow component, and an active sealing component; One end of the exhaust pipe is connected to the exhaust port of the range hood, and the other end is used to connect to a public flue or the outdoors. The anti-backflow assembly is disposed inside the smoke exhaust duct and includes a fixed frame, a movable sealing plate, and an elastic reset member. The fixed frame is fixedly connected to the inner wall of the smoke exhaust duct. The movable sealing plate is hinged to the fixed frame via a rotating shaft. One end of the elastic reset member is connected to the fixed frame, and the other end is connected to the movable sealing plate. The elastic reset member drives the movable sealing plate to conform to the side of the fixed frame to close the passage of the smoke exhaust duct. The active sealing assembly includes an electric push rod and a trigger switch. The electric push rod is fixed to the outer wall of the exhaust duct. The output end of the electric push rod penetrates the wall of the exhaust duct and extends into the interior of the exhaust duct, abutting against the side of the movable sealing plate away from the exhaust port of the range hood. The trigger switch is electrically connected to the fan circuit of the range hood and is used to control the electric push rod to retract when the fan is started and to control the electric push rod to extend and push the movable sealing plate to press and seal when the fan is turned off.

[0007] Furthermore, a sealing ring is affixed to the side edge of the movable sealing plate, and the sealing ring is adapted to fit the inner wall of the fixing frame.

[0008] As a further description of the above technical solution: by setting a sealing ring, the sealing performance between the movable sealing plate and the fixed frame is enhanced. Even if there are small gaps, the sealing ring can effectively fill them, preventing oil fume leakage and further improving the anti-backflow effect.

[0009] Furthermore, the elastic reset element is a torsion spring, which is sleeved on the rotating shaft, and its two ends are respectively engaged with the fixed frame and the movable sealing plate.

[0010] As a further description of the above technical solution: by using a torsion spring as an elastic reset element, not only is the structure simple and easy to install, but the elastic force of the torsion spring is uniform and stable, thus making it easy to maintain a good sealing state.

[0011] Furthermore, the fixing frame has a ring structure, and its outer peripheral wall is welded and sealed to the inner wall of the exhaust pipe. The inner peripheral wall of the fixing frame has a limiting ring groove corresponding to the movable sealing plate.

[0012] As a further description of the above technical solution: the ring structure design of the fixed frame and the opening of the limiting ring groove provide stable support and limit for the movable sealing plate, preventing it from shifting or shaking during operation, and further enhancing the stability and reliability of the anti-backflow structure.

[0013] Furthermore, the output end of the electric push rod is provided with a buffer pad, which abuts against the movable sealing plate. A guide slide rod is fixedly installed on the surface of the buffer pad and inserted into the side wall of the smoke exhaust pipe.

[0014] As a further description of the above technical solution: the buffer pad design at the output end of the electric push rod effectively reduces the impact force between the electric push rod and the movable sealing plate, extending the service life of the equipment. At the same time, the setting of the guide slide rod also ensures that the extension and retraction direction of the electric push rod is accurate, improving the operating accuracy of the equipment.

[0015] Furthermore, a protective net is provided at the end of the exhaust duct near the public flue, and the protective net is detachably connected to the inner wall of the exhaust duct by threads.

[0016] As a further description of the above technical solution: the protective net installed at the end of the exhaust duct near the public flue can effectively prevent large particles or insects from entering the exhaust duct, avoiding problems such as poor exhaust or failure of the anti-backflow structure caused by the accumulation of debris or insect nests, and further improving the overall performance and user experience of the range hood.

[0017] The technical effects and advantages of this utility model are as follows: 1. Compared with existing technologies, the anti-backflow structure of this range hood achieves double sealing protection through the synergistic effect of the anti-backflow component and the active sealing component. When the range hood fan starts, the trigger switch controls the electric push rod to retract, releasing the pushing action on the movable sealing plate. At this time, the elastic reset component drives the movable sealing plate to fit against the side of the fixed frame, but it is in an open state, ensuring that the smoke exhaust channel is unobstructed. When the fan is turned off, the electric push rod extends and pushes the movable sealing plate to press and seal it. At the same time, the elastic reset component provides auxiliary sealing force, effectively preventing the backflow of oil fumes in the common flue. This design not only solves the problem of poor sealing performance of a single check valve, but also avoids the phenomenon of valve jamming due to oil stains, significantly improving the reliability and durability of the anti-backflow structure.

[0018] 2. Compared with existing technologies, the anti-backflow structure of this range hood enhances the sealing performance between the movable sealing plate and the fixed frame by setting a sealing ring. Even if there are small gaps, the sealing ring can effectively fill them, preventing oil fume leakage and further improving the anti-backflow effect. By using a torsion spring as an elastic reset component, the structure is not only simple and easy to install, but the torsion spring's elasticity is also uniform and stable, thus facilitating the maintenance of a good sealing state. The annular structure design of the fixed frame and the opening of the limiting ring groove provide stable support and limitation for the movable sealing plate, preventing it from shifting or shaking during operation. The design further enhances the stability and reliability of the anti-backflow structure; the buffer pad design at the output end of the electric push rod effectively reduces the impact force between the electric push rod and the movable sealing plate, extending the service life of the equipment. At the same time, the guide slide rod ensures the accurate extension and retraction direction of the electric push rod, improving the operating precision of the equipment; the protective net installed at the end of the exhaust duct near the public flue effectively prevents large particles or insects from entering the exhaust duct, avoiding problems such as poor exhaust or failure of the anti-backflow structure caused by the accumulation of debris or insect nests, further improving the overall performance and user experience of the range hood. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural schematic diagram of the present invention from one perspective; Figure 2 This is a two-dimensional structural schematic diagram of the present invention from a different perspective; Figure 3 This is a partial cross-sectional view of the smoke exhaust duct of this utility model; Figure 4 for Figure 3 Enlarged structural diagram at point A in the middle; Figure 5 This is a side-section three-dimensional structural diagram of the smoke exhaust pipe of this utility model.

[0020] The attached diagram is labeled as follows: 1. Smoke exhaust duct; 2. Anti-backflow assembly; 3. Active sealing assembly; 101. Protective netting; 201. Fixed frame; 2011. Limiting ring groove; 202. Movable sealing plate; 2021. Sealing ring; 203. Elastic reset component; 204. Rotating shaft; 301, Electric push rod; 3011, Buffer pad; 3012, Guide slide rod; 302, Trigger switch. Detailed Implementation

[0021] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. In addition, the forms of the various structures described in the following embodiments are merely illustrative. The anti-backflow structure of the range hood involved in this utility model is not limited to the structures described in the following embodiments. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0022] Reference Figures 1 to 5 This utility model provides an anti-backflow structure for a range hood, including an exhaust pipe 1, an anti-backflow component 2, and an active sealing component 3.

[0023] One end of the exhaust pipe 1 is connected to the exhaust port of the range hood, and the other end is used to connect to a public flue or the outdoors.

[0024] By installing exhaust pipe 1, which is connected to the exhaust port of the range hood, the fumes generated when the range hood is working can be smoothly discharged to the public flue or outdoors, preventing the fumes from accumulating in the kitchen.

[0025] The exhaust duct 1 is usually made of corrosion-resistant and high-temperature-resistant metal or special plastic to ensure that it will not be damaged by the high temperature, high humidity and chemical corrosion of oil fumes during long-term use, thus ensuring smooth and stable exhaust.

[0026] A protective net 101 is installed at one end of the exhaust duct 1 near the public flue. The protective net 101 is detachably connected to the inner wall of the exhaust duct 1 by threads.

[0027] The protective net 101 installed at the end of the exhaust pipe 1 near the public flue can effectively prevent large particles or insects from entering the exhaust pipe 1, avoiding problems such as poor exhaust or failure of the anti-backflow structure caused by the accumulation of debris or insect nests, and further improving the overall performance and user experience of the range hood.

[0028] The anti-backflow component 2 is installed inside the smoke exhaust duct 1 and includes a fixed frame 201, a movable sealing plate 202, and an elastic reset component 203. The fixed frame 201 is fixedly connected to the inner wall of the smoke exhaust duct 1. The movable sealing plate 202 is hinged to the fixed frame 201 through a rotating shaft 204. One end of the elastic reset component 203 is connected to the fixed frame 201, and the other end is connected to the movable sealing plate 202. The elastic reset component 203 drives the movable sealing plate 202 to fit against the side of the fixed frame 201 to seal the passage of the smoke exhaust duct 1.

[0029] The active sealing assembly 3 includes an electric push rod 301 and a trigger switch 302. The electric push rod 301 is fixed to the outer wall of the exhaust pipe 1. The output end of the electric push rod 301 penetrates the pipe wall of the exhaust pipe 1 and extends into the interior of the exhaust pipe 1, and abuts against the side of the movable sealing plate 202 away from the exhaust port of the range hood. The trigger switch 302 is electrically connected to the fan circuit of the range hood and is used to control the electric push rod 301 to retract when the fan is started, and to control the electric push rod 301 to extend and push the movable sealing plate 202 to press and seal when the fan is turned off.

[0030] The anti-backflow structure of this range hood achieves double sealing protection through the synergistic action of the anti-backflow component 2 and the active sealing component 3. When the range hood fan starts, the trigger switch 302 receives the information and controls the electric push rod 301 to retract, releasing the pushing action on the movable sealing plate 202. At this time, the elastic reset component 203 drives the movable sealing plate 202 to fit against the side of the fixed frame 201, but it is in an open state. Under the action of wind force, it can push open the movable sealing plate 202 to ensure that the smoke exhaust channel is unobstructed. When the fan is turned off, the electric push rod 301 extends and pushes the movable sealing plate 202 to press and seal it. At the same time, the elastic reset component 203 provides auxiliary sealing force, effectively preventing the backflow of oil fumes in the common flue. This design not only solves the problem of poor sealing performance of a single check valve, but also avoids the phenomenon of valve jamming due to oil stains, significantly improving the reliability and durability of the anti-backflow structure.

[0031] A sealing ring 2021 is affixed to the side edge of the movable sealing plate 202, and the sealing ring 2021 fits and conforms to the inner wall of the fixing frame 201.

[0032] By setting the sealing ring 2021, the sealing performance between the movable sealing plate 202 and the fixed frame 201 is enhanced. Even if there are small gaps, the sealing ring 2021 can effectively fill them, preventing oil fume leakage and further improving the anti-backflow effect.

[0033] The elastic reset component 203 is a torsion spring, which is sleeved on the rotating shaft 204, and its two ends are respectively engaged with the fixed frame 201 and the movable sealing plate 202.

[0034] By using a torsion spring as the elastic reset element 203, the structure is not only simple and easy to install, but the elastic force of the torsion spring is uniform and stable, thus making it easy to maintain a good sealing state.

[0035] The fixing frame 201 has a ring structure, and its outer peripheral wall is welded and sealed to the inner wall of the exhaust pipe 1. The inner peripheral wall of the fixing frame 201 has a limiting ring groove 2011 corresponding to the movable sealing plate 202.

[0036] The ring structure design of the fixed frame 201 and the opening of the limiting ring groove 2011 provide stable support and limit for the movable sealing plate 202, preventing it from shifting or shaking during operation, and further enhancing the stability and reliability of the anti-backflow structure.

[0037] The output end of the electric push rod 301 is provided with a buffer pad 3011, which abuts against the movable sealing plate 202. A guide slide rod 3012 is fixedly installed on the surface of the buffer pad 3011, and the guide slide rod 3012 is inserted into the side wall of the smoke exhaust pipe 1.

[0038] The design of the buffer pad 3011 at the output end of the electric push rod 301 effectively reduces the impact force between the electric push rod 301 and the movable sealing plate 202, extending the service life of the equipment. At the same time, the setting of the guide slide rod 3012 also ensures that the extension and retraction direction of the electric push rod 301 is accurate, improving the operating accuracy of the equipment.

[0039] Finally, it should be noted that the accompanying drawings of the embodiments disclosed in this utility model only involve the structures involved in the embodiments disclosed in this utility model. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this utility model can be combined with each other.

Claims

1. A backflow prevention structure for a range hood, characterized in that, It includes a smoke exhaust duct (1), an anti-backflow assembly (2), and an active sealing assembly (3); One end of the exhaust pipe (1) is connected to the exhaust port of the range hood, and the other end is used to connect to the public flue or the outdoors; The anti-backflow component (2) is installed inside the exhaust pipe (1) and includes a fixed frame (201), a movable sealing plate (202) and an elastic reset component (203). The fixed frame (201) is fixedly connected to the inner wall of the exhaust pipe (1). The movable sealing plate (202) is hinged to the fixed frame (201) through a rotating shaft (204). One end of the elastic reset component (203) is connected to the fixed frame (201) and the other end is connected to the movable sealing plate (202). The elastic reset component (203) drives the movable sealing plate (202) to fit against the side of the fixed frame (201) to close the passage of the exhaust pipe (1). The active sealing assembly (3) includes an electric push rod (301) and a trigger switch (302). The electric push rod (301) is fixed to the outer wall of the exhaust pipe (1). The output end of the electric push rod (301) penetrates the pipe wall of the exhaust pipe (1) and extends into the interior of the exhaust pipe (1), and abuts against the side of the movable sealing plate (202) away from the exhaust port of the range hood. The trigger switch (302) is electrically connected to the fan circuit of the range hood and is used to control the electric push rod (301) to retract when the fan is started, and to control the electric push rod (301) to extend and push the movable sealing plate (202) to press and seal when the fan is turned off.

2. The anti-backflow structure for a range hood according to claim 1, characterized in that: A sealing ring (2021) is affixed to the side edge of the movable sealing plate (202), and the sealing ring (2021) is adapted to fit the inner wall of the fixing frame (201).

3. The anti-backflow structure for a range hood according to claim 1, characterized in that: The elastic reset component (203) is a torsion spring, which is sleeved on the rotating shaft (204) and its two ends are respectively engaged with the fixed frame (201) and the movable sealing plate (202).

4. The anti-backflow structure for a range hood according to claim 1, characterized in that: The fixing frame (201) has an annular structure, and its outer peripheral wall is welded and sealed to the inner wall of the exhaust pipe (1). The inner peripheral wall of the fixing frame (201) has a limiting annular groove (2011) corresponding to the movable sealing plate (202).

5. The anti-backflow structure for a range hood according to claim 1, characterized in that: The output end of the electric push rod (301) is provided with a buffer pad (3011), which abuts against the movable sealing plate (202). A guide slide rod (3012) is fixedly installed on the surface of the buffer pad (3011), and the guide slide rod (3012) is inserted into the side wall of the smoke exhaust pipe (1).

6. The anti-backflow structure for a range hood according to claim 1, characterized in that: The exhaust pipe (1) is provided with a protective net (101) at one end near the public flue. The protective net (101) is detachably connected to the inner wall of the exhaust pipe (1) by a thread.

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