A segmented, spaced-drainage flue type of smoke exhaust duct
By designing a segmented, spaced-drainage exhaust duct with an upper inlet, lower inlet, and intermediate drainage channel structure, the problems of backflow and oil blockage in the kitchen exhaust duct were solved, achieving accelerated smoke extraction and fire prevention, and improving the safety of the exhaust system.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- BEIJING LIHAOJIAYUAN BUILDING MATERIALS CO LTD
- Filing Date
- 2025-09-05
- Publication Date
- 2026-07-31
AI Technical Summary
The existing kitchen exhaust system suffers from backflow and grease blockage, resulting in poor ventilation and fire hazards.
Design a segmented, spaced-drainage smoke exhaust duct, including an upper inlet, a lower inlet, and a middle drainage duct. Oil is collected by an oil guide slope and an oil collection box, and combined with a fire-pull pipe to accelerate smoke exhaust and prevent backflow and fire.
It accelerates smoke extraction, prevents backflow and fire, improves ventilation capacity, prevents oil blockage, and enhances the system's fire resistance.
Smart Images
Figure CN224579010U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of civil ventilation ducts, and particularly relates to a segmented interval diversion channel type smoke exhaust duct. Background Technology
[0002] Currently, kitchens in each building are equipped with a shared exhaust pipe or exhaust duct. The exhaust duct has a rectangular cross-section and exhaust ports are installed on the pipe wall that connects to the upper part of each floor's kitchen. The exhaust duct is a pipe system that can collect the exhaust ports of the range hoods of each floor's kitchen into one exhaust duct, and then guide them from the exhaust duct to the top of the exhaust duct to be discharged into the atmosphere for dilution. This type of duct system can meet the needs of kitchen fume extraction. The system connects kitchens on different floors at the same vertical position. When a kitchen's range hood is turned on and forces exhaust into the duct system, the shared exhaust duct system, which uses only a simple duct structure, is under positive pressure everywhere. This causes varying amounts of "backflow" and "odor" to the intake of other range hoods that are not in operation. Backflow is even more serious when multiple range hoods are working together. On the other hand, the fumes extracted from the kitchen contain a large amount of oil. After entering the exhaust duct, the oil will gradually adhere to the duct wall, clogging the exhaust duct, reducing the exhaust efficiency, and creating a fire hazard. Often, if a fire breaks out in a kitchen on the ground floor, the flames will rise along the exhaust duct, making it easy for kitchens on higher floors to catch fire as well. Summary of the Invention
[0003] The purpose of this invention is to design a segmented, spaced-drainage flue-type exhaust duct to overcome the above-mentioned shortcomings of exhaust ducts, and to have the advantages of oil collection, fire prevention, accelerated smoke exhaust and prevention of backflow and gas leakage.
[0004] Therefore, a segmented, spaced-drainage-type smoke exhaust duct is provided, consisting of an exhaust duct and a smoke exhaust port located at the upper end of one side wall of the exhaust duct. On the inner wall of the smoke exhaust port side of each section of the exhaust duct that connects each floor above the first floor, there are three sections of drainage ducts arranged at intervals. The three drainage ducts are, from top to bottom, an upper inlet drainage duct, a middle drainage duct, and a lower inlet drainage duct. The lower side wall of the upper inlet drainage duct at the upper end connects to the smoke exhaust port of the exhaust duct on the same floor. The lower end face of the lower inlet drainage duct at the lower end connects to and connects to the upper end face of the upper inlet drainage duct on the adjacent lower floor. Only the upper inlet drainage duct is provided in the exhaust duct on the first floor of the building.
[0005] As a preferred technical solution of this utility model, the diversion channel is U-shaped and made of thin iron plate, with its two end faces integrated with the inner wall of the corresponding exhaust duct.
[0006] As a preferred technical solution of this utility model, the lower end face of the upper inlet channel and the middle channel is an inwardly oriented oil guiding slope, and the lower middle part of the oil guiding slope is bent inward with a bending angle of 25° to 30°.
[0007] As a preferred technical solution of this utility model, the exhaust port is provided with a flame-drawing tube. The lower side wall of the flame-drawing tube is connected to the exhaust port, or is connected to the exhaust port through a conduit. The flame-drawing tube is located in the upper inlet channel. The diameter of the lower end of the flame-drawing tube is larger than the diameter of the upper end. The lower end face of the flame-drawing tube is an arc-shaped sealing surface.
[0008] As a preferred embodiment of this utility model, an oil collection box is provided at the bottom of the exhaust duct.
[0009] As a preferred embodiment of this utility model, the spacing between the drainage channels is 15-25cm.
[0010] As a preferred embodiment of this utility model, the cross-sectional area of the drainage channel accounts for 20% to 25% of the cross-sectional area of the exhaust channel.
[0011] As a preferred embodiment of this utility model, the center vertical lines of each drainage channel are on the same vertical line.
[0012] Compared with the prior art, the beneficial effects that this utility model can achieve are:
[0013] (1) In this utility model, on the inner wall of the exhaust duct of each floor above the first floor of the building, there are three sections of diversion channels arranged at intervals. The three diversion channels are the upper inlet diversion channel, the middle diversion channel and the lower inlet diversion channel from top to bottom. The lower side wall of the upper inlet diversion channel at the upper end is connected to the exhaust duct of the floor where it is located. The lower end face of the lower inlet diversion channel at the lower end is connected to the upper end face of the upper inlet diversion channel of the adjacent lower floor. Only the upper inlet diversion channel is provided in the exhaust duct of the first floor of the building. In operation, kitchen fumes first enter the vent pipe through a duct and then flow into the upper inlet channel of the same floor. The vent pipe and upper inlet channel effectively draw and guide the fumes, accelerating exhaust and preventing backflow. Simultaneously, the walls of the upper, middle, and lower inlet channels effectively absorb oil from the fumes. Excess oil adhering to the walls flows downwards, dripping into each channel and descending layer by layer until it finally falls into the oil collection box at the bottom of the floor, providing excellent oil collection and fire prevention. Because the upper and lower inlet channels are spaced apart from the middle channel, the fumes can be adjusted according to changes in wind speed and pressure within the exhaust duct or each channel, ensuring the fumes are discharged from the exhaust duct as quickly as possible via the optimal path, thus accelerating exhaust.
[0014] (2) This utility model can improve the system's ventilation capacity, help prevent fires, effectively prevent "gas leakage" and easy fires in kitchens on different floors, and has the advantages of oil collection, fire prevention, accelerated smoke exhaust and prevention of backflow and gas leakage. It is also easy to produce and install and has good performance. Attached Figure Description
[0015] Figure 1 This is a schematic diagram of the structure of this utility model in use;
[0016] Figure 2 This is a schematic diagram of one section of the exhaust duct structure of this utility model;
[0017] Figure 3 This is the port structure of a section of the exhaust channel of this utility model;
[0018] Figure 4 for Figure 3 Schematic diagram of the cross-sectional structure of the middle AA section;
[0019] Figure 5 This is a schematic diagram of the connection structure of the two-story exhaust duct of this utility model. Detailed Implementation Plan
[0020] To make the technical means, creative features, and achieved objectives and effects of this utility model readily understandable, the present utility model is further described below in conjunction with specific embodiments. However, the following embodiments are merely preferred embodiments of this utility model and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments described herein without creative effort are all within the protection scope of this utility model. Unless otherwise specified, the experimental methods in the following embodiments are conventional methods. Unless otherwise specified, the materials and reagents used in the following embodiments are commercially available. Furthermore, unless otherwise explicitly stated and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0021] Example 1: As Figures 1 to 5As shown, a segmented, spaced-apart exhaust duct consists of an exhaust duct 9 and an exhaust port 5 located at the upper end of one side wall of the exhaust duct. The exhaust port 5 connects to the upper side wall of the kitchen on that floor. On the inner wall of the exhaust port 5 in each section of the exhaust duct 9 connecting to each floor above the first floor 6, three spaced-apart diversion channels are provided. The three diversion channels, from top to bottom, are the upper inlet diversion channel 3, the middle diversion channel 2, and the lower inlet diversion channel 31. The lower side wall of the upper inlet diversion channel 3 at the upper end connects to the exhaust port 5 of the exhaust duct on the same floor. The lower end face of the lower inlet diversion channel 31 at the lower end is connected to and communicates with the upper end face of the upper inlet diversion channel 3 on the adjacent lower floor.
[0022] like Figure 1 As shown, each floor from the first floor (6) to the top floor (7) of the building has an exhaust duct (9). These exhaust ducts (9) are connected in series to form a continuous exhaust duct system. The exhaust duct on the top floor (8) passes through the roof (10) and then through the ductwork to the ventilation cap (1), facilitating the discharge of smoke into the atmosphere. On the inner wall of the exhaust port (5) of each exhaust duct, there are three spaced-apart diversion channels: the upper inlet diversion channel (3), the middle diversion channel (2), and the lower inlet diversion channel (31). The lower side wall of the upper inlet diversion channel (3) connects to the exhaust port (5) of the exhaust duct on the same floor. The lower end face of the lower inlet diversion channel (31) connects to and is connected to the upper end face of the upper inlet diversion channel (3) on the adjacent lower floor.
[0023] The exhaust duct on the first floor of the building is equipped with only an upper inlet duct 3, but not a middle duct 2 or a lower inlet duct 31.
[0024] Each drainage channel is U-shaped and made of thin iron plate with a thickness of 0.8 to 1 mm. Its two ends are integrated with the inner wall of the corresponding exhaust duct.
[0025] The lower end face of each upper inlet channel and the lower end face of the middle channel form an inwardly oriented oil guiding slope 12. The lower middle part of the oil guiding slope bends inward with a bending angle of 25° to 30° to facilitate oil guiding 13.
[0026] The smoke exhaust port 5 is equipped with a flame extraction tube 4. The lower side wall of the flame extraction tube is connected to the smoke exhaust port, or it is connected to the smoke exhaust port through a conduit. The flame extraction tube is located in the upper inlet drainage channel. The diameter of the lower end of the flame extraction tube is larger than the diameter of the upper end. The lower end face of the flame extraction tube is an arc-shaped sealing surface.
[0027] An oil collection box 11 is provided at the bottom of the exhaust duct. An opening is provided on the side wall of the exhaust duct corresponding to the outer side wall of the oil collection box 11, for taking out or putting in the oil collection box.
[0028] The spacing between each section of the diversion channel is 15–25 cm to ensure that the flue gas can be discharged from the exhaust duct as quickly as possible along the optimal path. The cross-sectional area of the diversion channel accounts for 20%–25% of the cross-sectional area of the exhaust duct. The center vertical lines of each section of the diversion channel are on the same vertical line to facilitate oil guiding and collection.
[0029] In operation, kitchen fumes first enter the vent pipe through a duct and then flow into the upper inlet channel of the same floor. The vent pipe and upper inlet channel effectively draw and guide the fumes, accelerating exhaust and preventing backflow. Simultaneously, the walls of the upper, middle, and lower inlet channels effectively absorb oil from the fumes. Excess oil adhering to the walls flows downwards, dripping into each channel and descending layer by layer until it finally falls into the oil collection box at the bottom of the floor, providing excellent oil collection and fire prevention. Because the upper and lower inlet channels are spaced apart from the middle channel, the fumes can be adjusted according to changes in wind speed and pressure within the exhaust duct or each channel, ensuring the fumes are discharged from the exhaust duct as quickly as possible via the optimal path, thus accelerating exhaust.
[0030] The above description is merely a preferred embodiment of this utility model; however, the protection scope of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the technical scope disclosed in this utility model, based on the technical solution and its improved concept, should be included within the protection scope of this utility model.
Claims
1. A segmented, spaced-apart flue-type exhaust duct, comprising an exhaust duct and an exhaust port located at the upper end of one side wall of the exhaust duct, characterized in that: On the inner wall of the exhaust duct on one side of the smoke outlet in each section of the exhaust duct connecting each floor above the first floor of the building, there are three diversion channels arranged at intervals. The three diversion channels are, from top to bottom, the upper inlet diversion channel, the middle diversion channel, and the lower inlet diversion channel. The lower side wall of the upper inlet diversion channel at the top is connected to the smoke outlet of the exhaust duct of the floor where it is located. The lower end face of the lower inlet diversion channel at the bottom is connected to and connected to the upper end face of the upper inlet diversion channel of the adjacent lower floor. Only the upper inlet diversion channel is provided in the exhaust duct on the first floor of the building.
2. A segmented, spaced-apart flue-type exhaust duct according to claim 1, characterized in that: The aforementioned diversion channel is U-shaped and made of thin iron plate, with its two ends connected to the inner wall of the corresponding exhaust duct.
3. A segmented, spaced-apart flue-type exhaust duct according to claim 1, characterized in that: The lower end face of the upper inlet channel and the middle channel is an inwardly oriented oil guiding slope, and the lower middle part of the oil guiding slope bends inward with a bending angle of 25° to 30°.
4. A segmented, spaced-apart flue-type exhaust duct according to claim 1, characterized in that: The exhaust port is equipped with a flame-drawing tube. The lower side wall of the flame-drawing tube is connected to the exhaust port, or it is connected to the exhaust port through a conduit. The flame-drawing tube is located in the upper inlet channel. The diameter of the lower end of the flame-drawing tube is larger than the diameter of the upper end. The lower end face of the flame-drawing tube is an arc-shaped sealing surface.
5. A segmented, spaced-apart flue gas exhaust duct according to claim 1, characterized in that: An oil collection box is provided at the bottom of the exhaust duct.
6. A segmented, spaced-apart flue-type exhaust duct according to claim 1, characterized in that: The spacing between the various drainage channels is 15-25cm.
7. A segmented, spaced-apart flue-type exhaust duct according to claim 1, characterized in that: The cross-sectional area of the drainage channel accounts for 20% to 25% of the cross-sectional area of the exhaust channel.
8. A segmented, spaced-apart flue-type exhaust duct according to claim 1, characterized in that: The center perpendicular lines of each drainage channel are on the same perpendicular line.