Anti-backflow hood structure of kitchen exhaust pipe
By designing a backflood hood structure on the hood of the kitchen exhaust pipe, the roof cover and annular box prevent rainwater from entering, and combining the exhaust mechanism to increase suction, the problem of rainwater entering and insufficient suction in the existing exhaust pipe is solved, and effective smoke exhaust and anti-flood effect is achieved.
Patent Information
- Application Number
- CN202421865114.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-03
- Publication Date
- 2025-05-27
- Estimated Expiration
- 2034-08-03
AI Technical Summary
There are gaps in the hood of the existing kitchen exhaust pipe, causing rainwater to enter the exhaust pipe, affecting operation; at the same time, insufficient suction force causes the smoke to stay and backflow.
A backflood-proof hood structure is designed, including exhaust pipes, fixed square sleeves, conical round tubes, exhaust mechanisms, support seats, support rods, top covers, elastic rain cloths and ring boxes. The design of the top cover and ring box prevents rainwater from entering, and the suction force is increased by using the exhaust mechanism to prevent backflow.
Effectively prevent rainwater from entering the exhaust pipe, improve the flue gas discharge efficiency in the exhaust pipe, avoid backflow, and improve the practicality of the device.
Smart Images
Figure CN222909323U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of kitchen exhaust pipes, and more specifically to a backflow prevention hood structure of a kitchen exhaust pipe. Background Art
[0002] The exhaust duct is a chimney installed in the kitchen and bathroom of a house to discharge the smoke to the outside space. It is a non-metallic pipe product used to remove the oil smoke generated by cooking activities in the kitchen of the house or the foul air in the bathroom. It is also called a residential exhaust duct, a residential ventilation duct, and a residential flue. A hood will be set at the top of the exhaust duct; however, there are gaps between the blades of the hood. In rainy weather, rainwater from the outside may enter through the gaps, affecting the operation of the exhaust duct; in addition, the suction force of the smoke in the exhaust duct is small only by the rotation of the hood, which is not convenient for smoothly extracting the smoke, which will cause the smoke to stay in the exhaust duct and cause backflow. For this reason, we proposed a backflow prevention hood structure for kitchen exhaust pipes. Utility Model Content
[0003] In view of the problems mentioned in the above background technology, the purpose of the present utility model is to provide a backflow prevention hood structure for a kitchen exhaust pipe.
[0004] In order to solve the above problems, the utility model adopts the following technical solutions:
[0005] A backflow prevention hood structure for a kitchen exhaust pipe comprises an exhaust duct, the top end of the exhaust duct is provided with a fixed square sleeve, the top of the fixed square sleeve is provided with a conical circular tube, the conical circular tube is provided with an exhaust mechanism, the side of the fixed square sleeve is fixedly connected to a plurality of support seats, the top surfaces of the plurality of support seats are fixedly connected to support rods, the top ends of the plurality of support rods are fixedly connected to a top cover, the bottom surface of the top cover is fixedly connected to an elastic tarpaulin, and the bottom end of the elastic tarpaulin is fixedly connected to an annular box.
[0006] As a preferred solution of the utility model, the exhaust mechanism includes a support frame fixedly sleeved on the inner side of a conical circular tube, a self-lubricating bearing is fixedly sleeved in the middle of the support frame, a vertical shaft is fixedly sleeved in the middle of the self-lubricating bearing, the bottom end of the vertical shaft extends to the inner cavity of the exhaust duct and is fixedly connected to an exhaust blade, and a fan cap is fixedly connected to the top end of the vertical shaft.
[0007] As a preferred solution of the utility model, a plurality of bolts are provided on the side of the fixing square sleeve, and the ends of the plurality of bolts are threadedly installed into the interior of the exhaust pipe.
[0008] As a preferred solution of the utility model, the outer side surface of the elastic rain cloth is flush with the outer side surface of the top cover, and the outer diameter of the top cover is larger than the outer diameter of the wind blade cap.
[0009] As a preferred solution of the utility model, the inner side surface of the fixed square sleeve is in contact with the outer side surface of the top end of the exhaust pipe.
[0010] As a preferred solution of the utility model, the outer side surface of the top end of the conical circular tube and the inner side surface of the bottom end of the fan blade cap are in contact with each other.
[0011] The advantages of the utility model are:
[0012] (1) In the utility model, a top cover above the fan cap is used to protect it. When it rains, the top cover is used to shield the top of the fan cap, and at the same time, rainwater on the top cover falls from the side into the annular box. As the amount of rainwater in the annular box increases, the annular box gradually moves downward. At this time, the elastic tarpaulin is stretched, and the elastic tarpaulin and the annular box are used to effectively shield the side of the fan cap from rain, preventing rainwater from entering the exhaust duct through the gap on the fan cap.
[0013] (2) In the utility model, natural wind is used to drive the fan cap to rotate, and the fan cap is used to drive the vertical shaft and the exhaust blades to rotate, and the rotation of the exhaust blades is used to blow air upward, so that the rotation of the exhaust blades sucks air from the inner cavity of the exhaust duct, and then the smoke in the exhaust duct is quickly discharged, thereby avoiding the problem of smoke in the exhaust duct not being discharged in time and prone to backflow, thereby improving its practicality. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 It is a schematic diagram of the overall structure of the utility model;
[0015] Figure 2 It is an exploded view of the overall structure of the utility model;
[0016] Figure 3 It is a cross-sectional schematic diagram of a tapered circular tube of the utility model;
[0017] Figure 4 It is a structural schematic diagram of the fan blade cap of the utility model.
[0018] Description of the numbers in the figure:
[0019] 1. Exhaust duct; 2. Fixed square sleeve; 3. Conical round tube; 4. Exhaust mechanism; 5. Support seat; 6. Support rod; 7. Top cover; 8. Elastic rain cloth; 9. Ring box; 10. Support frame; 11. Self-lubricating bearing; 12. Vertical shaft; 13. Fan blade cap; 15. Exhaust blade; 16. Bolt. DETAILED DESCRIPTION
[0020] The following will clearly and completely describe the technical solutions in the embodiments of the utility model in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0021] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.
[0022] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "set / connected", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.
[0023] Example:
[0024] See also Figure 1-4 A backflow prevention hood structure for a kitchen exhaust pipe comprises an exhaust pipe 1, a fixed square sleeve 2 is provided at the top end of the exhaust pipe 1, a conical circular tube 3 is provided at the top of the fixed square sleeve 2, an exhaust mechanism 4 is provided on the conical circular tube 3, a plurality of support seats 5 are fixedly connected to the side of the fixed square sleeve 2, a plurality of support seats 5 are fixedly connected to the top surfaces of the plurality of support seats 5, a top cover 7 is fixedly connected to the top ends of the plurality of support rods 6, an elastic rain cloth 8 is fixedly connected to the bottom surface of the top cover 7, and an annular box 9 is fixedly connected to the bottom end of the elastic rain cloth 8.
[0025] In this embodiment, the top cover 7 and the annular box 9 are made of lightweight materials to avoid the weight of the top cover 7 and the annular box 9 affecting the device.
[0026] For details, please refer to Figures 1 to 4The exhaust mechanism 4 includes a support frame 10 fixedly sleeved on the inner side of the conical circular tube 3, a self-lubricating bearing 11 is fixedly sleeved in the middle of the support frame 10, a vertical shaft 12 is fixedly sleeved in the middle of the self-lubricating bearing 11, the bottom end of the vertical shaft 12 extends to the inner cavity of the exhaust duct 1 and is fixedly connected to an exhaust blade 15, and a fan cap 13 is fixedly connected to the top of the vertical shaft 12.
[0027] In this embodiment, natural wind outside the impeller cap 13 is used to drive the impeller cap 13, the vertical shaft 12 and the exhaust blades 15 to rotate. The rotation of the exhaust blades 15 causes the inner cavity of the fixed square sleeve 2 to exhaust air into the inner cavity of the exhaust duct 1, so as to extract the smoke in the fixed square sleeve 2.
[0028] For details, please refer to Figure 1 The side of the fixing square sleeve 2 is sleeved with a plurality of bolts 16 , and the ends of the plurality of bolts 16 are threadedly installed into the interior of the exhaust pipe 1 .
[0029] In this embodiment, the fixing square sleeve 2 is installed on the exhaust pipe 1 by using bolts 16 .
[0030] For details, please refer to Figure 1 The outer side surface of the elastic rain cloth 8 is flush with the outer side surface of the top cover 7, and the outer diameter of the top cover 7 is greater than the outer diameter of the wind blade cap 13.
[0031] In this embodiment, the fit between the side of the top cover 7 and the side of the elastic tarp 8 ensures that rainwater above the top cover 7 can fall into the annular box 9. In addition, the top cover 7 can completely cover the top of the fan blade cap 13.
[0032] For details, please refer to Figure 1 The inner side surface of the fixed square sleeve 2 is in contact with the outer side surface of the top end of the exhaust pipe 1.
[0033] In this embodiment, the stability of the fixed square sleeve 2 being sleeved on the top end of the exhaust pipe 1 is ensured.
[0034] For details, please refer to Figure 1 The outer side surface of the top end of the conical tube 3 and the inner side surface of the bottom end of the fan blade cap 13 are fitted.
[0035] In this embodiment, the stability of the fan blade cap 13 being sleeved on the top of the conical circular tube 3 is ensured, and the sealing between the conical circular tube 3 and the fan blade cap 13 is ensured.
[0036] Working principle: When in use, the fixed square sleeve 2 is installed on the outside of the top of the exhaust duct 1 by bolts 16, and the natural wind is used to drive the fan cap 13 to rotate, and the fan cap 13 is used to drive the vertical shaft 12 and the exhaust blade 15 to rotate, and the rotation of the exhaust blade 15 is used to blow air upward, so that the rotation of the exhaust blade 15 sucks air from the inner cavity of the exhaust duct 1, and then the smoke in the exhaust duct 1 is quickly discharged. In addition, the top cover 7 above the fan cap 13 is used to protect it. When it rains, the top of the fan cap 13 is first covered by the top cover 7, and the top of the fan cap 13 is also covered. The rainwater on the top cover 7 falls from the side into the annular box 9. As the amount of rainwater in the annular box 9 increases, the annular box 9 gradually moves downward. At this time, the elastic tarpaulin 8 is stretched, and the elastic tarpaulin 8 and the annular box 9 are used to cover the side of the bottom end of the top cover 7, thereby effectively blocking the rain from the side of the wind blade cap 13, preventing rainwater from entering the exhaust duct 1 through the gap on the wind blade cap 13. When the sky is clear, the rainwater in the annular box 9 evaporates due to heat. At this time, the weight of the annular box 9 is reduced, and the elastic tarpaulin 8 shrinks and resets, ensuring that the external natural wind blows the wind blade cap 13.
[0037] The above is only a preferred specific implementation method of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can make equivalent substitutions or changes within the technical scope disclosed by the utility model according to the technical solution and improved ideas of the utility model, which should be included in the protection scope of the utility model.
Claims
1. A backflow prevention hood structure for a kitchen exhaust pipe, comprising an exhaust pipe (1), characterized in that: The top end of the exhaust duct (1) is provided with a fixed square sleeve (2), the top of the fixed square sleeve (2) is provided with a conical circular tube (3), the conical circular tube (3) is provided with an exhaust mechanism (4), the side of the fixed square sleeve (2) is fixedly connected to a plurality of support seats (5), the top surfaces of the plurality of support seats (5) are fixedly connected to support rods (6), the top ends of the plurality of support rods (6) are fixedly connected to a top cover (7), the bottom surface of the top cover (7) is fixedly connected to an elastic rain cloth (8), and the bottom end of the elastic rain cloth (8) is fixedly connected to an annular box (9).
2. The anti-backflow hood structure of a kitchen exhaust pipe according to claim 1, characterized in that: The exhaust mechanism (4) comprises a support frame (10) fixedly sleeved on the inner side of the conical circular tube (3); a self-lubricating bearing (11) is fixedly sleeved in the middle of the support frame (10); a vertical shaft (12) is fixedly sleeved in the middle of the self-lubricating bearing (11); the bottom end of the vertical shaft (12) extends to the inner cavity of the exhaust duct (1) and is fixedly connected to an exhaust blade (15); and the top end of the vertical shaft (12) is fixedly connected to a blade cap (13).
3. The anti-backflow hood structure of a kitchen exhaust pipe according to claim 1, characterized in that: The side of the fixed square sleeve (2) is sleeved with a plurality of bolts (16), and the ends of the plurality of bolts (16) are threadedly mounted to the inside of the exhaust pipe (1).
4. The anti-backflow hood structure of a kitchen exhaust pipe according to claim 2, characterized in that: The outer side surface of the elastic rain cloth (8) is flush with the outer side surface of the top cover (7), and the outer diameter of the top cover (7) is greater than the outer diameter of the fan blade cap (13).
5. The anti-backflow hood structure of a kitchen exhaust pipe according to claim 1, characterized in that: The inner side surface of the fixed square sleeve (2) fits the outer side surface of the top end of the exhaust pipe (1).
6. The anti-backflow hood structure of a kitchen exhaust pipe according to claim 2, characterized in that: The outer side surface of the top end of the conical circular tube (3) fits in with the inner side surface of the bottom end of the fan blade cap (13).