Double centrifugal fan multiple oil fume purification range hood
By combining a dual centrifugal fan design with a multi-stage purification structure, the problem of insufficient oil fume purification efficiency and equipment stability in traditional range hoods is solved, achieving efficient oil fume separation and purification to meet the high standards required by modern kitchens.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHONGSHAN JINHUA CATERING EQUIPMENT CO LTD
- Filing Date
- 2025-07-15
- Publication Date
- 2026-07-21
Smart Images
Figure CN224534324U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of range hood technology, specifically a range hood with dual centrifugal fans and multiple oil fume purification functions. Background Technology
[0002] With the continuous improvement of modern living standards, both residential and commercial kitchens have increasingly stringent requirements for air quality. As a crucial piece of equipment for controlling kitchen fumes, the performance of range hoods directly impacts the cleanliness of the kitchen air and the health of users. Traditional range hoods primarily rely on the suction power of a fan to draw fumes into the machine, where they are purified through simple filtration or separation devices before being discharged. However, with the diversification of cooking methods and the increasing complexity of fumes, traditional range hoods have several shortcomings in terms of fume purification efficiency and equipment stability.
[0003] Existing technologies commonly employ range hood designs that combine a single-stage centrifugal fan with a single-stage linear fume conveying structure. In this structure, fumes are directly drawn in by the fan and transported along a straight channel to the exhaust port. During the purification process, it is difficult for fume particles to remain and separate sufficiently, resulting in incomplete removal of grease and fine particles, thus limiting the purification effect. Furthermore, the suction power and airflow control capabilities of a single-fan design are limited, making it difficult to meet the demands of high-concentration fume environments. In addition, the linear conveying path results in a relatively high airflow velocity, preventing sufficient contact between the fumes and the purification components, thus reducing condensation and filtration efficiency.
[0004] More importantly, the single-fan linear conveyor structure lacks an effective airflow regulation and uniform distribution mechanism, which easily leads to localized accumulation or overflow of oil fumes. This not only affects the hygiene of the kitchen environment but also increases the difficulty of equipment maintenance and the risks of use. When dealing with high-temperature, high-concentration oil fumes, existing equipment is prone to problems such as excessive fan load, increased noise, and high energy consumption, making it difficult to achieve the goal of energy conservation and environmental protection.
[0005] Therefore, in view of the shortcomings of traditional single-stage fans and linear smoke guide structures, there is an urgent need for a high-efficiency range hood that can optimize airflow path, improve suction power, extend the residence time of oil fumes, and combine multiple purification structures to achieve more thorough oil fume separation and purification, and meet the higher requirements of modern kitchens for air quality and equipment performance. Utility Model Content
[0006] To address the shortcomings of existing technologies, this utility model provides a dual centrifugal fan multi-stage oil fume purification range hood to solve the aforementioned problems.
[0007] To achieve the above objectives, this utility model provides the following technical solution: a dual centrifugal fan multi-stage oil fume purification range hood, comprising a lower casing and an upper casing installed on top of it, including: The dual heavy oil fume purification component is installed at the front port of the lower chassis. It includes a mounting frame directly installed on the front port of the lower chassis, a heavy oil condensation glass panel installed in front of the mounting frame, and a filter screen installed behind the mounting frame. The primary centrifugal fan is installed in the left half of the lower casing. The secondary centrifugal fan is installed in the right half of the upper casing. The electrostatic adsorption device and the activated carbon adsorption box are stacked and installed in the left half of the upper chassis as the second and third heavy-duty oil fume purification structures. The upper and lower chassis are connected by an air guide channel located on the left side of the connecting surface.
[0008] As a preferred technical solution of this utility model, the lower port of the electrostatic adsorption device is specifically snapped into the upper port position of the air guide channel.
[0009] As a preferred technical solution of this utility model, the front port of the lower casing is set to a forward-sloping structure, and a partition is installed at the front end of the lower casing. The partition, the left and right front walls of the lower casing, and the top frame of the mounting frame enclose a smoke collection chamber.
[0010] As a preferred technical solution of this utility model, a strip-shaped air guide hole is provided on the top frame of the mounting frame to connect to the inside of the smoke collection chamber.
[0011] As a preferred technical solution of this utility model, the heavy oil condensing glass panel is specifically snapped onto the hanging brackets provided on the front face of the side frames of the mounting frame.
[0012] As a preferred technical solution of this utility model, a U-shaped smoke inlet channel is formed between the outer edge of the heavy oil condensing glass panel and the inner frame of the mounting frame.
[0013] As a preferred technical solution of this utility model, the air outlet end of the first-stage centrifugal fan is sealed and connected to the lower port of the air guide channel.
[0014] As a preferred technical solution of this utility model, the electrostatic adsorption device is specifically equipped with a high-voltage electrostatic field and an ozone generator.
[0015] As a preferred technical solution of this utility model, the primary centrifugal fan and the secondary centrifugal fan are diagonally distributed vertically.
[0016] As a preferred technical solution of this utility model, a horizontally distributed oil collection groove is snapped into the bottom of the lower casing.
[0017] Compared with the prior art, this utility model provides a dual centrifugal fan multi-stage oil fume purification range hood, which has the following beneficial effects: This dual-centrifugal fan multi-stage fume purification range hood utilizes an innovative diagonally distributed dual centrifugal fan design, significantly optimizing the internal space layout of the casing. This achieves an S-shaped upward path for the fume airflow, extending the residence time of the fumes within the purification system and thus greatly improving the efficiency of fume capture and purification. The diagonal arrangement of the primary and secondary centrifugal fans not only fully utilizes the lateral space of the casing and avoids airflow interference between the fans but also enhances the overall suction power, allowing the fumes to be drawn into the purification system more quickly and thoroughly.
[0018] The rational configuration of multiple oil fume purification structures, combined with dual heavy-duty oil fume purification components (heavy-duty oil condensing glass panel and multi-layer stainless steel filter screen), electrostatic adsorption device, and activated carbon adsorption box, forms a four-dimensional purification system. First, the heavy-duty oil condensing glass panel utilizes the temperature difference effect and oleophobic coating to achieve efficient condensation and separation of grease, effectively reducing the oil fume load. Second, the multi-layer filter screen mechanically intercepts larger oil fume particles, ensuring the stable operation of subsequent purification devices. Third, the electrostatic adsorption device precisely captures fine oil fume particles and decomposes harmful gases through a high-voltage electric field, improving air purification quality. Finally, the activated carbon adsorption box deeply adsorbs oil fume odors and harmful gases, ensuring that the emitted air is clean and harmless.
[0019] Based on the above design, this range hood not only achieves efficient separation and purification of oil fumes, but also effectively prevents oil fume overflow, ensuring a clean kitchen environment and operational safety. Its multi-stage purification structure and the synergistic effect of dual centrifugal fans significantly improve the overall performance of oil fume purification and the lifespan of the equipment, meeting the modern kitchen's demand for efficient and environmentally friendly oil fume treatment equipment, and possessing broad market application prospects and promotional value.
[0020] This dual-centrifugal fan, multi-stage fume purification range hood features an innovative S-shaped airflow path created by a diagonally distributed dual-fan layout. This significantly extends the residence time of fumes within the purification system, enhancing suction power and purification efficiency. The rationally combined multi-layered, multi-structure fume purification components form a four-stage purification system, including condensation separation, mechanical filtration, electrostatic adsorption, and activated carbon adsorption. This system effectively removes grease particles, odors, and harmful gases, ensuring clean and environmentally friendly exhaust air. Furthermore, the scientifically designed casing prevents fume overflow, improving equipment safety and ease of use. Overall, this range hood balances high-efficiency purification with energy conservation and environmental protection, meeting the high standards required by modern kitchens and possessing significant practical value and widespread application potential. Attached Figure Description
[0021] Figure 1 This is a schematic diagram of the internal structure of this utility model; Figure 2 This is a schematic diagram of the external structure of this utility model; Figure 3This is an exploded separation diagram of the dual heavy oil fume purification component of this utility model; Figure 4 This is a schematic diagram showing the distribution of the strip-shaped air guide holes in this utility model; Figure 5 This is a schematic diagram of the oil fume purification path of this utility model.
[0022] The components include: 1. Lower casing; 2. Upper casing; 3. Dual heavy-duty oil fume purification components; 4. Primary centrifugal fan; 5. Secondary centrifugal fan; 6. Electrostatic adsorber; 7. Activated carbon adsorption box; 8. Oil collection tank. 11. Air duct; 12. Partition; 31. Mounting frame; 32. Glass panel; 33. Filter screen; 311. Strip-shaped air vent; 312. Hanging bracket. Detailed Implementation
[0023] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. Obviously, the described embodiments are only a part of the embodiments of the utility model, and not all of them. Unless otherwise specified, the embodiments and features described in this application can be combined with each other. All other embodiments obtained by those skilled in the art based on the embodiments of the utility model without creative effort are within the scope of protection of the utility model.
[0024] It should be noted that if the utility model embodiment involves directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators 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 indicators will also change accordingly.
[0025] Furthermore, "multiple" refers to two or more. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of a person 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 a combination of technical solutions does not exist and is not within the scope of protection claimed by the utility model.
[0026] Please see Figure 1-5A dual-centrifugal fan multi-stage fume purification range hood includes a lower casing 1 and an upper casing 2 mounted on top of it. A dual heavy-duty fume purification assembly 3 is located at the front port of the lower casing 1. This assembly includes a mounting frame 31 directly mounted on the front port of the lower casing 1, a heavy-duty oil condensation glass panel 32 mounted in front of the mounting frame 31, and a filter screen 33 mounted behind the mounting frame 31. The heavy-duty oil condensation glass panel 32 is fixed to the mounting brackets 312 on the front side of both sides of the mounting frame 31 by a snap-fit method, and its outer edge forms a U-shaped smoke inlet channel with the inner frame of the mounting frame 31, which is beneficial for the effective introduction and condensation of oil fumes.
[0027] The heavy-duty oil condensation glass panel 32 serves as the first stage of purification in this range hood. Made of specially treated tempered glass with an oleophobic coating, it causes the grease in the hot fumes to rapidly condense into droplets upon contact with the relatively cool glass panel. These droplets flow down the glass surface and eventually into the oil collection tank 8 at the bottom, achieving initial oil-fume separation. The U-shaped smoke inlet channel design ensures even distribution of fumes across the entire glass panel surface, improving condensation efficiency. The filter plate 33, the second stage of purification, uses a multi-layered stainless steel mesh structure to intercept larger oil fume particles while ensuring smooth airflow.
[0028] The front port of the lower casing 1 adopts a forward-sloping structure and is equipped with a partition 12 inside. The partition 12, the left and right front walls of the lower casing 1 and the top frame of the mounting frame 31 enclose a smoke collection chamber. The top edge of the mounting frame 31 is provided with a strip-shaped air guide hole 311 that connects to the inside of the smoke collection chamber, forming a negative pressure area, which can effectively prevent oil fumes from overflowing.
[0029] A primary centrifugal fan 4 is installed in the left half of the lower casing 1. Its outlet is sealed and connected to the lower port of the air guide channel 11 located on the left side of the connection surface between the lower casing 1 and the upper casing 2. The air guide channel 11 runs through the left side of the upper and lower casings, allowing the oil fumes to be transported in a closed manner to the electrostatic adsorption device 6 and the activated carbon adsorption box 7.
[0030] The upper casing 2 houses a secondary centrifugal fan 5 in the right half of the casing, forming a diagonal arrangement with the primary centrifugal fan 4. This diagonal arrangement of the two fans not only optimizes the use of internal space but also creates an S-shaped upward airflow path, extending the residence time of fumes in the purification system. Furthermore, compared to the traditional single-fan design, this design further enhances the suction power of the range hood.
[0031] An electrostatic adsorption device 6 and an activated carbon adsorption box 7 are stacked vertically in the left half of the upper casing 2, forming the second and third layers of oil fume purification structure. The lower port of the electrostatic adsorption device 6 is snapped into the upper port of the air guide channel 11, ensuring that airflow enters the electrostatic adsorption zone from the air guide channel. The electrostatic adsorption device is equipped with a high-voltage electrostatic field and an ozone generator, which can effectively capture fine oil fume particles and decompose harmful gases, improving the purification effect. The activated carbon adsorption box 7 has excellent adsorption performance for harmful substances such as oil fume odors, benzene compounds, and aldehydes. The adsorption box can adopt a drawer-type design for easy periodic replacement of the activated carbon filter.
[0032] The working process of this dual centrifugal fan multi-stage fume purification range hood is as follows: When the range hood is turned on, kitchen fumes first enter the system through the dual heavy-duty oil fume purification assembly 3 at the front of the lower casing 1. When the high-temperature oil fumes come into contact with the heavy-duty oil condensing glass panel 32, the grease components in the fumes quickly condense into droplets due to the temperature difference. These droplets flow down the oleophobic glass surface and collect in the bottom oil collection tank 8, completing the first stage of purification. The uncondensed fumes are evenly distributed through the U-shaped smoke inlet channel formed between the outer edge of the heavy-duty oil condensing glass panel 32 and the inner frame of the mounting frame 31, and then enter the filter plate 33. Its multi-layer stainless steel mesh structure intercepts larger oil fume particles, achieving the second stage of purification.
[0033] After initial purification, the oil fumes are strongly drawn in by the primary centrifugal fan 4. The fumes near the top are collected in the upper smoke collection chamber, and then, along with the fumes from other directions, are drawn into the primary centrifugal fan 4 and conveyed upwards through the air guide channel 11 sealed at its outlet. The oil fumes then enter the electrostatic adsorption device 6 on the left side of the upper casing 2 along the air guide channel 11 that runs through the left side area of the upper and lower casings 2. Under the action of a high-voltage electrostatic field, fine oil fume particles are effectively captured, while the ozone generator decomposes harmful gases, completing the third stage of purification.
[0034] Subsequently, the airflow continues to rise into the activated carbon adsorption box 7, where the activated carbon filter fully adsorbs residual oil fumes, odors, benzene compounds, aldehydes, and other harmful substances, achieving the fourth stage of purification. Finally, the clean air, after four stages of purification, is extracted by the secondary centrifugal fan 5 installed in the right half of the upper casing 2 and discharged outdoors.
[0035] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
[0036] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.
[0037] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.
Claims
1. A dual-centrifugal fan multi-stage oil fume purification range hood, comprising a lower casing (1) and an upper casing (2) mounted on top thereof, characterized in that, include: The dual heavy oil fume purification component (3) is installed at the front port of the lower chassis (1). It includes a mounting frame (31) directly installed on the front port of the lower chassis (1), a heavy oil condensation glass panel (32) installed in front of the mounting frame (31), and a filter screen (33) installed behind the mounting frame (31). A primary centrifugal fan (4) is installed in the left half of the lower casing (1); A secondary centrifugal fan (5) is installed in the right half of the upper casing (2); Electrostatic adsorption device (6) and activated carbon adsorption box (7), wherein the activated carbon adsorption box (7) and electrostatic adsorption device (6) are used as the second and third heavy oil fume purification structures and are stacked on top of each other in the left half of the upper casing (2); The upper casing (2) and the lower casing (1) are connected by an air guide channel (11) provided on the left side of the connecting surface.
2. The dual centrifugal fan multi-stage oil fume purification range hood according to claim 1, characterized in that: The lower port of the electrostatic adsorption device (6) is specifically snapped into the upper port of the air guide channel (11).
3. The dual centrifugal fan multi-stage oil fume purification range hood according to claim 1, characterized in that: The front port of the lower casing (1) is configured to be tilted forward. A partition (12) is installed at the front end of the lower casing (1). The partition (12), the left and right walls of the front end of the lower casing (1), and the top frame of the mounting frame (31) enclose a smoke collection chamber.
4. The dual centrifugal fan multi-stage oil fume purification range hood according to claim 3, characterized in that: The mounting frame (31) has a strip-shaped air guide hole (311) on its top edge that connects to the inside of the smoke collection chamber.
5. The dual centrifugal fan multi-stage oil fume purification range hood according to claim 1, characterized in that: The heavy oil condensing glass panel (32) is specifically snapped onto the mounting bracket (312) provided on the front end of the side frames of the mounting frame (31).
6. The dual centrifugal fan multi-stage oil fume purification range hood according to claim 1, characterized in that: A U-shaped smoke inlet channel is formed between the outer edge of the heavy oil condensing glass panel (32) and the inner frame of the mounting frame (31).
7. The dual centrifugal fan multi-stage oil fume purification range hood according to claim 1, characterized in that: The outlet end of the primary centrifugal fan (4) is sealed and connected to the lower port of the air guide channel (11).
8. The dual centrifugal fan multi-stage oil fume purification range hood according to claim 1, characterized in that: The electrostatic adsorption device is specifically equipped with a high-voltage electrostatic field and an ozone generator.
9. The dual centrifugal fan multi-stage oil fume purification range hood according to claim 1, characterized in that: The primary centrifugal fan (4) and the secondary centrifugal fan (5) are diagonally distributed vertically.
10. The dual centrifugal fan multi-stage oil fume purification range hood according to claim 1, characterized in that: The bottom of the lower casing (1) is fitted with a horizontally distributed oil collection trough (8).