Variable frequency fume exhaust system
By designing the exhaust stack, rain shelter, and drip plate of the variable frequency smoke exhaust system, the problems of oil mist adhesion and rainwater diffusion in the fume system are solved, achieving oil fume purification and rainwater separation, reducing oil pollution and leakage risks, and simplifying the cleaning process.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JIANGXI BAOFENG ELECTROMECHANICAL EQUIP CO LTD
- Filing Date
- 2025-07-15
- Publication Date
- 2026-06-02
AI Technical Summary
Existing commercial smoke exhaust systems have downward-bending pipes connected to the exhaust fan, causing oil mist to adhere to the ground and form oil stains. This affects the appearance and may lead to leakage and corrosion. When it rains, the oil stains spread and increase, and the smoke purifier cannot completely prevent them from escaping, resulting in pollution and safety hazards.
Design a variable frequency smoke exhaust system, which adopts a structure of smoke exhaust duct, rain shelter, drip plate and oil drain pipe. Oil fumes are discharged upward and drip back into the duct after two collisions. The overflow of grease is treated by the baffle and oil drain pipe. A sealing door and guide plate are set up to facilitate cleaning. The rain shelter prevents rainwater from entering. The grease is treated by an oil-water treatment system.
It effectively avoids oil pollution caused by spraying oil fumes, reduces grease buildup, prevents rainwater from entering, achieves oil fume purification and rainwater separation, simplifies the cleaning process, and reduces maintenance costs.
Smart Images
Figure CN224316256U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of oil fume emission systems, specifically a variable frequency smoke exhaust system. Background Technology
[0002] Variable frequency exhaust systems are a highly efficient and energy-saving commercial kitchen fume treatment solution, specifically designed for high-fume emission locations such as commercial restaurants and hotels. This system utilizes intelligent variable frequency technology to automatically adjust fan speed based on the actual fume emissions from the kitchen, reducing energy consumption during off-peak hours and enhancing extraction efficiency during peak hours, achieving a dynamic balance.
[0003] Existing smoke extraction systems, especially commercial ones like those in restaurants, produce large volumes of smoke containing oil mist. Even pre-filters cannot completely prevent the escape of oil fumes. To prevent water from entering the fan, the exhaust end of existing smoke extraction systems is usually connected to a downward-curving pipe. While this prevents rainwater from entering, the smoke is sprayed directly onto the ground, making it easy for oil mist to adhere. Although the amount of oil mist is very small after purification, it will still form oil stains on the ground over time, affecting aesthetics and causing leaks and corrosion. Furthermore, when it rains, the oil stains may mix with rainwater and spread, increasing their area and making the surrounding area slippery and prone to falls. Utility Model Content
[0004] Therefore, the purpose of this utility model is to provide a variable frequency smoke exhaust system to solve the technical problems mentioned in the background art.
[0005] To achieve the above objectives, this utility model provides the following technical solution: a variable frequency exhaust system applied to a stove, comprising a variable frequency fan, an exhaust pipe connected to the exhaust fan's outlet, a rain shelter connected to the top of the exhaust pipe, and a drip plate fixed to the bottom of the rain shelter; a baffle fixed inside the exhaust pipe, an oil drain pipe connected to one side of the exhaust pipe; a cleaning port provided on the other side of the exhaust pipe, with a sealing door connected to the top of the cleaning port, and a guide plate connected to the lower part of the exhaust pipe.
[0006] By adopting the above technical solution, the exhaust hood directs the fumes upwards, thus avoiding fumes spraying downwards and causing oil pollution. The fumes enter the exhaust hood vertically and are discharged upwards, with the drip plate ensuring that the fumes, after two collisions, drip back into the lower part of the exhaust hood, reducing surrounding oil. The oil drain pipe overflows, sending the oil dripping back into the lower part of the exhaust hood to the restaurant's oil and water treatment system for treatment and discharge together with kitchen wastewater, reducing pollution. The baffle acts as a liquid seal, preventing fumes from flowing back into the drain pipe. If the liquid level is too low to form a liquid seal during initial use or after cleaning, water can be poured into the lower part of the exhaust hood to create a liquid seal. During rainfall, a rain shelter protects the area from rain, with the shelter sloping downwards on all sides to prevent water accumulation at the top and horizontal water flow at the bottom. The grease flows through the drip plate into the exhaust pipe. Cleaning is scheduled monthly or weekly. For example, if there is a lot of grease, the lower part of the exhaust pipe can be cleaned weekly; if there is less grease, it can be cleaned monthly. During cleaning, the staff opens the sealed door. The cleaning port and guide plate facilitate the collection of viscous grease, and the lowest point of the cleaning port outlet is higher than the highest point of the grease drain pipe to prevent grease and water from overflowing when the sealed door is opened. Therefore, staff can use tools such as shovels to scrape or remove the deposited grease. A container is placed below the cleaning port outlet beforehand to collect the grease for later transport. After cleaning, the staff rotates the sealed door downwards to close it. The sealed door is composed of stainless steel and fluororubber sealing rings. After the sealed door is closed, rainwater is prevented from directly entering the exhaust pipe through the cleaning port.
[0007] Furthermore, the outer surface, back, and sides of the rain shelter are all inclined downwards.
[0008] By adopting the above technical solution, rainwater is blocked by the rain shelter during rainfall. The rain shelter is tilted downwards on all sides to prevent water from accumulating at the top of the rain shelter and to prevent rainwater from flowing horizontally at the bottom of the rain shelter and falling into the exhaust pipe through the drip plate.
[0009] Furthermore, the bottom of the drip plate is conical.
[0010] By adopting the above technical solution, the fumes are discharged upward through the exhaust pipe, thereby avoiding oil pollution caused by the fumes spraying to the ground. In addition, the fumes are vertically cut into the exhaust pipe and discharged upward, and with the help of the drip plate, the fumes are colliding twice and dripping back into the lower part of the exhaust pipe, reducing the surrounding oil.
[0011] Furthermore, the baffle is in the shape of a "7" and corresponds to the oil drain pipe.
[0012] By adopting the above technical solution, the plate acts as a liquid seal to prevent flue gas from entering the oil drain pipe and causing flue gas backflow. If the liquid level is too low to form a liquid seal during initial use or after cleaning, water can be poured into the lower part of the flue to form a liquid seal.
[0013] Furthermore, the sealing door is rotatably connected to the exhaust pipe.
[0014] By adopting the above technical solution, staff can set the cleaning time to be once a month or once a week. For example, if there is a lot of oil fumes, the grease inside the bottom of the exhaust pipe can be cleaned once a week. If there are less oil fumes, it can be cleaned monthly. When cleaning, staff can open the sealed door to start the cleaning work.
[0015] Furthermore, the bottom of the cleaning port is inclined, and the cross-section of the guide plate is triangular.
[0016] By adopting the above technical solution, the cleaning port and guide plate facilitate the gathering of viscous grease, so workers can use tools such as shovels to scrape or remove the deposited grease.
[0017] Furthermore, the cleaning port is located on the upper side of the oil drain pipe.
[0018] By adopting the above technical solution, the lowest point of the cleaning port outlet is higher than the highest point of the oil drain pipe, which avoids oil and water overflow when the sealing door is opened and prevents grease overflow and pollution.
[0019] Furthermore, the variable frequency fan has a flexible connector at its air inlet end, and one end of the flexible connector is connected to an oil fume purifier via a pipe. The oil fume purifier's air inlet end is connected to a smoke collection hood via a pipe, and the stove is located below the smoke collection hood.
[0020] By adopting the above technical solution, when the restaurant cooks food with the stove, the variable frequency fan will extract the oil fumes. The oil fumes enter the exhaust system through the fume collection hood, and then enter the oil fume purifier to remove most of the oil. Subsequently, the oil fumes enter the variable frequency fan through the flexible connector, and the variable frequency fan sends the oil fumes into the exhaust stack.
[0021] Furthermore, a drip edge and a water-stop groove are respectively provided on one side of the inside of the chimney, and both the drip edge and the water-stop groove are sloping.
[0022] By adopting the above technical solution, the inlet of the flue is protected by a sloping drip edge and a water-stop groove, preventing rainwater drifting into the flue from flowing horizontally through the inlet and entering the variable frequency fan.
[0023] Furthermore, a locking bolt is connected between the sealing door and the exhaust pipe, and the locking bolt is detachably connected to the sealing door and the exhaust pipe.
[0024] By adopting the above technical solution, the staff can reinstall the locking bolts to limit the sealing door and prevent it from being opened directly by external forces such as wind.
[0025] In summary, the present invention has the following main advantages:
[0026] 1. This utility model, through the setting of a chimney, a rain shelter, and a drip plate, allows the fumes to be discharged upwards by adding a rain shelter to the chimney, preventing rainwater from entering and thus avoiding oil pollution caused by the fumes spraying to the ground. In addition, the fumes are vertically cut into the chimney and discharged upwards, and with the drip plate, the fumes are collided twice and drip back into the lower part of the chimney, reducing the surrounding oil and preventing grease pollution caused by the fumes spraying to the ground.
[0027] 2. This utility model, through the setting of an oil drain pipe and a baffle, sends the oil dripping back into the lower part of the exhaust pipe to the restaurant's oil-water treatment system for treatment together with the kitchen wastewater, reducing pollution. The baffle acts as a liquid seal to prevent flue gas from entering the oil drain pipe and causing flue gas backflow; it also facilitates automatic processing of the dripping oil.
[0028] 3. This utility model, through the setting of guide plate, cleaning port and sealing door, makes it easy to gather viscous grease. Later, the deposited grease can be dug out through the cleaning port. The lowest point of the cleaning port outlet is higher than the highest point of the oil drain pipe to prevent oil and water from overflowing when the sealing door is opened. In daily use, the sealing plate prevents rainwater from directly entering the exhaust pipe through the cleaning port. It is also convenient to clean the deposited grease. Attached Figure Description
[0029] Figure 1 This is a simplified system diagram of the present invention;
[0030] Figure 2 This is a schematic diagram of the variable frequency fan structure of this utility model;
[0031] Figure 3 This is a schematic cross-sectional view of the exhaust pipe structure of this utility model;
[0032] Figure 4 This is a schematic diagram of the cross-sectional structure of the cleaning port of this utility model;
[0033] Figure 5 This is a schematic diagram of the rain shelter structure of this utility model from below.
[0034] In the diagram: 1. Variable frequency fan; 2. Flexible connector; 3. Fume purifier; 4. Smoke hood; 5. Stove; 6. Exhaust pipe; 7. Rain shelter; 8. Drip plate; 9. Oil drain pipe; 10. Baffle; 11. Guide plate; 12. Cleaning port; 13. Sealing door; 14. Drip edge; 15. Water stop groove; 16. Locking bolt. Detailed Implementation
[0035] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.
[0036] The embodiments of this utility model will be described below based on its overall structure. Example 1
[0037] A variable frequency smoke exhaust system, such as Figures 2-5 As shown, the system includes a variable frequency fan 1, with an exhaust pipe 6 connected to the outlet end of the fan 1. The exhaust pipe 6 directs the fumes upwards, preventing them from spraying onto the ground and causing oil pollution. The fumes are vertically inserted into the exhaust pipe 6 and discharged upwards, working in conjunction with a drip plate 8 to ensure the fumes are colliding twice and dripping back into the lower part of the exhaust pipe 6, reducing surrounding oil. A rain shelter 7 is connected to the top of the exhaust pipe 6. The outer surface, back, and sides of the rain shelter 7 slope downwards, and a drip plate 8 is fixed to the bottom of the rain shelter 7. The bottom of the drip plate 8 is conical. During rainfall, the rain shelter 7 blocks rainwater, and the rain shelter 7 slopes downwards on all sides to prevent water from accumulating at the top of the rain shelter 7 and to prevent rainwater from flowing horizontally at the bottom of the rain shelter 7 and falling into the exhaust pipe 6 through the drip plate 8. A baffle 10 is fixed inside the exhaust pipe 6, and the baffle 10 is shaped like a "7". An oil drain pipe 9 is connected to one side of the exhaust pipe 6, corresponding to the baffle 10. The oil drain pipe 9 overflows and sends the oil dripping back into the lower part of the exhaust pipe 6 to the restaurant's oil and water treatment system. The system treats and discharges wastewater together with kitchen wastewater to reduce pollution. The baffle 10 acts as a liquid seal to prevent flue gas from flowing into the grease drain pipe 9 and causing flue gas backflow. If the liquid level is too low to form a liquid seal during initial use or after cleaning, water can be poured into the lower part of the exhaust pipe 6 to form a liquid seal. A cleaning port 12 is provided on the other side of the exhaust pipe 6. The cleaning port 12 is located above the grease drain pipe 9. The bottom of the cleaning port 12 is inclined. A sealing door 13 is connected to the top of the cleaning port 12. The sealing door 13 is rotatably connected to the exhaust pipe 6. A guide plate 11 is connected to the lower part of the exhaust pipe 6. The guide plate 11 has a triangular cross section. The cleaning port 12 and the guide plate 11 facilitate the collection of viscous grease. The lowest point of the outlet of the cleaning port 12 is higher than the highest point of the grease drain pipe 9 to prevent oil and water from overflowing when the sealing door 13 is opened. Therefore, workers can use shovels or other tools to scrape or remove the deposited grease. Workers should also place a container below the outlet of the cleaning port 12 in advance to facilitate the collection and transportation of grease.
[0038] See Figure 1 In the above embodiment, the air inlet end of the variable frequency fan 1 is connected to a flexible connector 2. One end of the flexible connector 2 is connected to an oil fume purifier 3 through a pipe. The air inlet end of the oil fume purifier 3 is connected to a smoke collection hood 4 through a pipe. The stove 5 is located below the smoke collection hood 4. When the restaurant cooks food through the stove 5, the variable frequency fan 1 will extract the oil fumes. The oil fumes enter the exhaust system through the smoke collection hood 4. Then, the oil fumes enter the oil fume purifier 3 to remove most of the oil. Subsequently, the oil fumes enter the variable frequency fan 1 through the flexible connector 2. The variable frequency fan 1 sends the oil fumes into the exhaust pipe 6. Example 2
[0039] Based on the above embodiment one, the following settings are now implemented to enhance the rainproof effect.
[0040] See Figure 3 and Figure 4 In the above embodiment, a drip edge 14 and a water stop groove 15 are respectively provided on one side of the inside of the flue 6. Both the drip edge 14 and the water stop groove 15 are sloping. The sloping drip edge 14 and the water stop groove 15 protect the inlet of the flue 6 and prevent rainwater drifting into the flue 6 from flowing laterally and entering the variable frequency fan 1 through the flue inlet. Example 3
[0041] Based on the above embodiment 1, in order to increase the stability of the sealing door 13 after it is closed, the following settings are now implemented.
[0042] See Figure 2 and Figure 3 In the above embodiment, a locking bolt 16 is connected between the sealing door 13 and the exhaust pipe 6. The locking bolt 16 is disconnected from the sealing door 13 and the exhaust pipe 6. The operator can reinstall the locking bolt 16 to limit the sealing door 13 and prevent the sealing door 13 from being directly opened by external forces such as wind.
[0043] The implementation principle of this utility model is as follows: First, when the restaurant cooks food through the stove 5, the variable frequency fan 1 will draw out the oil fumes. The oil fumes enter the exhaust system through the fume collection hood 4. Then, the oil fumes enter the oil fume purifier 3 to remove most of the oil. Subsequently, the oil fumes enter the variable frequency fan 1 through the flexible connector 2. The variable frequency fan 1 sends the oil fumes into the exhaust pipe 6.
[0044] The exhaust duct 6 directs the fumes upwards, preventing them from spraying downwards and causing oil pollution. The fumes enter the exhaust duct 6 vertically and are discharged upwards, working in conjunction with the drip plate 8 to cause the fumes to collide twice and drip back into the lower part of the exhaust duct 6, reducing the surrounding oil. The oil drain pipe 9 overflows and sends the oil dripping back into the lower part of the exhaust duct 6 to the restaurant's oil and water treatment system for treatment and discharge together with the kitchen wastewater, reducing pollution. The baffle 10 acts as a liquid seal to prevent fumes from flowing into the oil drain pipe 9 and causing backflow. If the liquid level is too low to form a liquid seal during initial use or after cleaning, water can be poured into the lower part of the exhaust duct 6 to form a liquid seal.
[0045] During rainfall, the rain shelter 7 blocks the rainwater, and the rain shelter 7 is tilted downwards on all sides. This is to prevent water from accumulating on the top of the rain shelter 7 and to prevent rainwater from flowing horizontally at the bottom of the rain shelter 7 and falling into the exhaust pipe 6 through the drip plate 8. The sloping drip edge 14 and water stop groove 15 protect the entrance of the exhaust pipe 6 and prevent rainwater that has drifted into the exhaust pipe 6 from flowing horizontally and entering the variable frequency fan 1 through the exhaust port entrance.
[0046] Staff will clean the chimney 6 monthly or weekly. For example, if there is a lot of oil fumes, the grease inside the lower part of the chimney 6 can be cleaned weekly. If there are fewer oil fumes, it can be cleaned monthly. During cleaning, the staff will remove the locking bolt 16, and then open the sealing door 13. The cleaning port 12 and the guide plate 11 facilitate the collection of viscous grease. The lowest point of the cleaning port 12 outlet is higher than the highest point of the oil drain pipe 9 to prevent oil and water from overflowing when the sealing door 13 is opened. Therefore, the staff can use tools such as shovels to scrape or remove the deposited grease. The staff will also place a container below the cleaning port 12 outlet in advance to collect the grease for later transportation. After cleaning, the staff will turn the sealing door 13 downward to close it. The sealing door 13 is composed of stainless steel and fluororubber sealing rings. After the sealing door 13 is closed, it prevents rainwater from directly entering the chimney 6 through the cleaning port 12. Then the staff will reinstall the locking bolt 16 to limit the sealing door 13 and prevent the sealing door 13 from being directly opened by external forces such as wind.
[0047] Although embodiments of the present invention have been shown and described, these specific embodiments are merely explanations of the present invention and are not intended to limit the invention. The specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions, and variations to the embodiments as needed without departing from the principles and spirit of the present invention, provided that such modifications, substitutions, and variations are within the scope of the claims of the present invention and are protected by patent law.
Claims
1. A variable frequency smoke extraction system, applied to a stove (5), comprising a variable frequency fan (1), characterized in that: The variable frequency fan (1) is connected to a chimney (6) at its outlet. A rain shelter (7) is connected to the top of the chimney (6), and a drip plate (8) is fixed to the bottom of the rain shelter (7). A baffle (10) is fixed inside the chimney (6). An oil drain pipe (9) is connected to one side of the chimney (6). A cleaning port (12) is provided on the other side of the chimney (6), and a sealing door (13) is connected to the top of the cleaning port (12). A guide plate (11) is connected to the bottom inside the chimney (6).
2. The variable frequency smoke exhaust system according to claim 1, characterized in that: The outer surface, back and sides of the rain shelter (7) are all inclined downwards.
3. The variable frequency smoke exhaust system according to claim 1, characterized in that: The bottom of the drip plate (8) is conical.
4. The variable frequency smoke exhaust system according to claim 1, characterized in that: The baffle (10) is in the shape of a "7" and corresponds to the oil drain pipe (9).
5. The variable frequency smoke exhaust system according to claim 1, characterized in that: The bottom of the cleaning port (12) is inclined, and the sealing door (13) is rotatably connected to the exhaust pipe (6).
6. The variable frequency smoke exhaust system according to claim 1, characterized in that: The guide plate (11) has a triangular cross-section.
7. The variable frequency smoke exhaust system according to claim 4, characterized in that: The cleaning port (12) is located on the side above the drain pipe (9).
8. The variable frequency smoke exhaust system according to claim 1, characterized in that: The variable frequency fan (1) has a flexible connector (2) at its air inlet end, and one end of the flexible connector (2) is connected to an oil fume purifier (3) through a pipe. The oil fume purifier (3) has a smoke collection hood (4) at its air inlet end through a pipe, and the stove (5) is located below the smoke collection hood (4).
9. The variable frequency smoke exhaust system according to claim 1, characterized in that: The inside of the chimney (6) is provided with a drip edge (14) and a water stop groove (15) on one side, and both the drip edge (14) and the water stop groove (15) are sloping.
10. The variable frequency smoke exhaust system according to claim 5, characterized in that: A locking bolt (16) is connected between the sealing door (13) and the exhaust pipe (6), and the locking bolt (16) is detachably connected to the sealing door (13) and the exhaust pipe (6).