A range hood with oil fume two-stage separation function

Abstract

A kind of range hood with oil fume two degree separation function, it includes smoke collecting cover, the front end of smoke collecting cover is provided with the smoke collecting area of recess, at least one air inlet is formed in the smoke collecting area, smoke collecting cover top is equipped with suction module, suction module is communicated with the air inlet, suction module generates negative pressure when working, and oil fume is inhaled from the air inlet, filter oil screen is covered and installed at the air inlet, condensing plate is installed in the smoke collecting area along the flow direction of oil fume at the back side of filter oil screen, and annular air inlet area is formed between the periphery and back of condensing plate and smoke collecting area, so that oil fume enters air inlet around flow condensing plate edge to realize two degree separation.The beneficial effects of the utility model are that: in the range hood of the utility model, the setting of condensing plate not only realizes the effective covering of filter oil screen, but also greatly improves the appearance of range hood.In existing range hood, filter oil screen is exposed outside, which often affects the overall appearance, and after oil accumulation, it further aggravates the problem.

Description

Technical Field

[0001] This utility model relates to the field of range hood technology, specifically a range hood with a two-stage oil fume separation function. Background Technology

[0002] With the improvement of people's living standards and the continuous improvement of kitchen environments, range hoods, as one of the essential appliances in modern kitchens, have been widely used in various family kitchens, catering industries, and commercial kitchens. Traditional range hoods typically draw in cooking fumes through an air intake module, perform preliminary separation through a filter screen, and then discharge them outdoors. While this design can reduce kitchen fume pollution to some extent, existing range hoods still have some significant shortcomings in the design of their filter screens, specifically as follows: 1. Currently, many range hoods have exposed grease filters, especially some traditional models where the filter is directly exposed outside the smoke collection hood, making it prone to grease buildup. This not only affects the appearance of the range hood but also creates inconvenience for users in cleaning and maintenance. Because grease easily adheres to the filter, users need to clean it regularly, increasing maintenance costs and inconvenience.

[0003] 2. Some range hoods use high-density oil filters to enhance filtration. However, excessively dense filters slow down the flow of fumes, causing oil to accumulate on the filter surface and gradually clog the pores. As the clogging worsens, the flow of fumes is restricted, potentially weakening the range hood's suction power and affecting its performance. Furthermore, clogged filters are more difficult to clean and disassemble, increasing maintenance costs.

[0004] 3. Relatively speaking, some range hoods choose to use oil filters with larger pores to reduce the risk of clogging. However, excessively large pores in the filter can prevent the effective separation of oil from the fumes, hindering sufficient secondary separation and filtration. This results in the ineffective capture of oil droplets in the fumes, leading to suboptimal separation performance of the range hood. Consequently, it affects the cleanliness of the kitchen environment and may even negatively impact indoor air quality. Therefore, further improvements are necessary. Utility Model Content

[0005] The purpose of this utility model is to overcome the shortcomings of existing technologies and provide a range hood with a more compact structure, a more beautiful appearance, and an effective improvement in the oil fume separation effect and working efficiency.

[0006] The purpose of this utility model is achieved through the following method: a range hood with a secondary oil fume separation function, comprising a smoke collection hood, a concave smoke collection area at the front end of the smoke collection hood, at least one air inlet in the smoke collection area, a suction module installed on the top of the smoke collection hood, the suction module being connected to the air inlet, the suction module generating negative pressure when working, drawing in oil fumes from the air inlet, an oil filter screen covering the air inlet, a condenser plate installed behind the oil filter screen in the smoke collection area along the direction of oil fume flow, the condenser plate forming an annular air intake area around its perimeter and back with the smoke collection area, so that the oil fumes flow around the edge of the condenser plate and enter the air inlet to achieve secondary separation.

[0007] Furthermore, the projected area of ​​the condenser plate is 80% to 90% of the projected area of ​​the smoke collection area.

[0008] Furthermore, hinge seats are provided on both sides of the top of the condenser plate, and the top of the condenser plate is installed in the smoke collection area through the hinge seats. The hinge seats allow the condenser plate to rotate around the hinge seats.

[0009] Furthermore, ball bearing seats are provided on both sides of the bottom of the condenser plate, and the bottom of the condenser plate is detachably installed in the smoke collection area through these ball bearing seats.

[0010] Furthermore, there are two air inlets, arranged symmetrically on the left and right sides.

[0011] Furthermore, the smoke collection area is a trapezoidal concave cavity that is larger on the outside and smaller on the inside, with the opening facing downwards or forwards.

[0012] Furthermore, the condenser plate is made of glass or metal sheet.

[0013] The beneficial effects of this utility model are: 1. Simple structure, low production cost, and improved market competitiveness.

[0014] 2. In this utility model of the range hood, the condenser plate not only effectively covers the grease filter, but also greatly improves the aesthetic appearance of the range hood. In existing range hoods, exposed grease filters often affect the overall appearance, and this problem is exacerbated by grease buildup. This utility model, by designing the condenser plate behind the grease filter, conceals the exposed filter, resulting in a simpler, more streamlined, and easier-to-clean appearance for the range hood, thus enhancing the user experience and the product's aesthetic appeal.

[0015] 3. The condenser plate plays a primary role in oil fume separation in this invention. After the oil fumes are drawn into the range hood, they are first condensed by the condenser plate, and some of the oil is condensed and separated. Due to the condenser plate, the filter screen only needs to handle the remaining oil fumes, which greatly reduces the workload of the filter screen, reduces the accumulation of oil in the fumes, extends the service life of the filter screen, and reduces the need for frequent cleaning.

[0016] 4. Since the condenser plate undertakes the primary task of oil fume separation, the oil filter can be designed with a looser mesh structure, thus avoiding clogging problems caused by overly dense mesh. While ensuring effective oil fume separation, the loose mesh allows for smoother airflow, enabling oil fumes to pass through the filter more efficiently without clogging or reduced suction power. Therefore, the frequency of filter cleaning is greatly reduced during range hood use, making maintenance simpler and further optimizing the user experience.

[0017] 5. By combining the condenser plate and the oil filter, this invention effectively improves the secondary separation of oil fumes. The condenser plate first condenses the oil in the fumes, while the oil filter primarily handles the remaining fumes, significantly enhancing the separation effect. Compared to traditional range hoods, this design reduces the clogging rate of the oil filter while still ensuring efficient oil fume separation, effectively reducing kitchen oil fume pollution and improving indoor air quality. Attached Figure Description

[0018] Figure 1 This is a diagram showing the final assembly and usage effect of this utility model.

[0019] Figure 2 This is a cross-sectional view of the structure of this utility model.

[0020] Figure 3 This is an exploded view of the structure of this utility model.

[0021] Figure 4 This is a schematic diagram of the structure behind the concealed condenser plate of this utility model.

[0022] Explanation of reference numerals in the attached diagram: 1. Smoke hood; 2. Smoke collection area; 3. Air inlet; 4. Air intake module; 5. Oil filter; 6. Condenser plate; 7. Annular air intake area; 8. Hinge seat; 9. Ball bearing seat. Detailed Implementation

[0023] The present invention will be further described in detail below with reference to the accompanying drawings. A range hood with a secondary oil fume separation function includes a smoke collection hood 1, a concave smoke collection area 2 at the front end of the smoke collection hood 1, at least one air inlet 3 in the smoke collection area 2, a suction module 4 installed on the top of the smoke collection hood 1, the suction module 4 being connected to the air inlet 3, the suction module 4 generating negative pressure when working, drawing in oil fumes from the air inlet 3, an oil filter screen 5 covering the air inlet 3, a condenser plate 6 installed behind the oil filter screen 5 in the smoke collection area 2 along the direction of oil fume flow, the condenser plate 6 forming an annular air intake area 7 between its periphery and back and the smoke collection area 2, so that the oil fumes flow around the edge of the condenser plate 6 and enter the air inlet 3 to achieve secondary separation.

[0024] In this embodiment: the suction module 4 generates negative pressure, drawing the fumes into the fume collection area 2 of the fume collection hood 1. The fumes enter the fume collection area 2 through the air inlet 3 and undergo preliminary filtration at the oil filter screen 5. The condenser plate 6 is located behind the oil filter screen. As the fumes flow through the condenser plate, the oil in the fumes is condensed and separated, and the condenser plate plays a first-stage role in fume separation. The remaining fumes enter the annular air intake area 7 and are finally further filtered through the oil filter screen 5. This design enables the range hood to achieve efficient secondary separation of fumes and oil, avoiding excessive oil accumulation and clogging of the oil filter screen. The condenser plate separates the oil in the fumes first, reducing the workload of the oil filter screen, extending its service life, and reducing the cleaning frequency. At the same time, the condenser plate covers the oil filter screen, improving the appearance of the range hood and making it more concise and aesthetically pleasing.

[0025] In one embodiment, the projected area of ​​the condenser plate 6 is 80% to 90% of the projected area of ​​the smoke collection area 2.

[0026] In this embodiment, the size of the condenser plate, ranging from 80% to 90%, ensures that the fumes are fully condensed as they flow through it, while also preventing the condenser plate from occupying excessive space, thus maintaining smooth fume flow. This size ratio makes the overall structure of the range hood more rational, preventing obstruction of fume flow and fully utilizing the separation function of the condenser plate.

[0027] Properly sized condenser plates ensure optimal condensation performance while avoiding wasted space or obstructed fume flow due to excessive size. Furthermore, a reasonable area ratio improves fume separation, ensuring the condenser plate functions fully.

[0028] In one embodiment: hinge seats 8 are provided on both sides of the top of the condenser plate 6, and the top of the condenser plate 6 is installed in the smoke collection area 2 through the hinge seats 8. The hinge seats 8 allow the condenser plate 6 to rotate around the hinge seats 8.

[0029] In this embodiment, the hinged base 8 allows the condenser plate to rotate within a certain angle range, enabling adjustment of the condenser plate's angle or cleaning as needed. When cleaning the condenser plate is required, the user can easily disassemble or adjust its angle by rotating the condenser plate, facilitating maintenance.

[0030] In one embodiment: ball bearing seats 9 are provided on both sides of the bottom of the condenser plate 6, and the bottom of the condenser plate 6 is detachably installed in the smoke collection area 2 through the ball bearing seats 9, so that the condenser plate 6 can be easily disassembled and cleaned.

[0031] In this embodiment, the ball bearing holder 9 is designed as a detachable structure, allowing users to easily remove the condenser plate for cleaning. When the condenser plate needs cleaning or maintenance, the user simply removes the ball bearing holder 9 from the smoke collection area to easily remove the condenser plate for thorough cleaning. This easy-to-disassemble design reduces the frequency and difficulty of cleaning, allowing users to maintain the long-term efficient operation of the range hood.

[0032] In one embodiment: there are two air inlets 3, and the two air inlets 3 are arranged symmetrically from left to right.

[0033] In this embodiment, the air inlets 3 are designed as two symmetrically arranged to ensure that the fumes are evenly distributed when entering the fume collection area, avoiding concentrated flow of fumes that could lead to incomplete separation of fumes in some areas. The symmetrical arrangement makes the flow of fumes more stable, which helps to improve the overall fume separation efficiency.

[0034] Meanwhile, the symmetrical air inlet design ensures that the fumes are evenly distributed within the fume collection area, improving the efficiency of fume separation. The stable flow of fumes prevents uneven distribution, further enhancing the performance of the range hood.

[0035] In one embodiment, the smoke collection area 2 is a trapezoidal concave cavity with a larger outer surface and a smaller inner surface, with the opening facing downwards or forwards. This trapezoidal design effectively guides the oil fumes to the bottom of the collection area, and the optimized angle allows the fumes to be quickly concentrated and guided to the air inlet 3. The trapezoidal structure makes the flow of oil fumes more stable, and the concave cavity design enhances the suction and separation effect of the range hood.

[0036] In one embodiment, the condenser plate 6 is made of glass or metal sheet.

[0037] In this embodiment, the condenser plate 6 is made of glass or metal sheet, possessing good high-temperature resistance and corrosion resistance. The material of the condenser plate can withstand the high temperatures generated during the operation of the range hood and the potential corrosion caused by oil fumes on its surface, ensuring the stability and durability of the condenser plate during long-term use. Simultaneously, the high-quality material has good thermal conductivity, which helps improve the condensation effect of the condenser plate and ensures efficient separation of oil fumes.

[0038] In summary: When the suction module 4 is working, it creates negative pressure in the smoke collection area 2 within the smoke collection hood 1, drawing in surrounding fumes from the stovetop. The fumes first interact with the condenser plate 6 located at the air inlet, resulting in the first stage of separation. The condensed / impacted oil droplets collect along the surface of the condenser plate and fall to the oil collection structure at the bottom of the smoke collection area. Subsequently, the remaining fumes flow around the annular air intake area 7 formed between the condenser plate and the smoke collection area and enter the oil filter 5 located at the rear for the second stage of separation. The filtered or condensed oil is finally discharged into the oil collection tank or oil cup, while clean air is discharged by the suction module through the exhaust channel. This two-stage separation sequence ensures separation efficiency, reduces the frequency of filter clogging, improves appearance, and facilitates maintenance.

[0039] Specifically: When the range hood is working, the suction module 4 generates negative pressure, and the two symmetrical air inlets 3 draw the fumes evenly into the smoke collection area 2.

[0040] The trapezoidal smoke collection area, which is larger on the outside and smaller on the inside, with its opening facing downwards or forwards, uses geometric convergence to gather and guide the oil fumes when they enter the condensation and separation area, forming a flow field distribution that is conducive to separation. This ensures that the oil fume source covers the stove and also forms a stable flow line.

[0041] The condenser plate 6 covers / blocks the oil filter screen 5, serving as the first barrier on the windward or near-windward side. The following are the main mechanisms that occur when the oil fume airflow comes into contact with the condenser plate: a. Inertial impact and retention: Large oil droplets or particles deviate from the airflow line due to inertia, directly impacting the plate surface and adhering to it; b. Surface condensation and coagulation: Oil vapor or submicron oil droplets condense and gradually form larger droplets after heat / mass exchange with the condenser plate or near the wall. c. Turbulent condensation and increased residence time: The design of the condenser plate and its edges and the annular air inlet area causes airflow to circulate and locally recirculate, increasing the chance of oil droplets colliding and coalescing with the wall or other micro-droplets.

[0042] These processes cause a large proportion of the grease to separate from the gas phase in the form of droplets, which then collect, flow down, or drip along the surface of the condenser plate, thus completing the first stage of oil fume separation.

[0043] The oil droplets formed after condensation flow down the condenser plate to the pre-designed oil collection tank under the action of gravity, which facilitates regular cleaning.

[0044] The condenser plate can be easily disassembled / flipped / removed via the hinge seat 8 and the ball bearing seat 9, which facilitates daily cleaning.

[0045] The annular air intake zone formed around and behind the condenser plate and between it and the smoke collection area encourages uncondensed or uninterrupted oil fume to bypass the edges of the condenser plate and enter the oil filter. This annular channel serves two important functions: a. Prolonging the residence time of gaseous oil droplets facilitates the merging or settling of small oil droplets through flow around them, local buffer zones, and shear layers; b. Distribute the airflow evenly to the post-filter screen to avoid excessive local flow velocity, which could reduce filtration efficiency or cause uneven stress on the filter screen.

[0046] Furthermore, the oil filter screen provides a second layer of separation: After being "pre-treated" by the condenser plate, the remaining oil fumes enter the oil filter screen 5. At this time, the amount of oil and the concentration of oil droplets reaching the filter screen are significantly reduced. The filter screen mainly relies on mechanisms such as interception, collision, and coagulation to complete secondary separation. The captured oil droplets are guided by the filter screen into the oil collection system or are scraped off / collected by the downstream flow of the filter screen.

[0047] Since the first layer of the filter plate absorbs a large amount of oil, the filter screen can adopt a relatively sparse pore design to reduce pressure drop and the probability of clogging, thereby maintaining more stable suction and significantly extending the cleaning interval.

[0048] Finally, after dual separation, the purified air is further drawn in by the suction module and discharged outdoors or into the circulation system. Due to the condenser plate's adjustment of the airflow field and the increased pore size of the filter, the overall aerodynamic resistance of the system can be kept at a low level, thus maintaining the working efficiency of the suction module, and therefore it can be widely used.

[0049] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A range hood with a two-stage oil fume separation function, comprising a smoke collection hood (1), a concave smoke collection area (2) provided at the front end of the smoke collection hood (1), at least one air inlet (3) provided in the smoke collection area (2), and a suction module (4) installed on the top of the smoke collection hood (1), the suction module (4) being connected to the air inlet (3), the suction module (4) generating negative pressure when working, and sucking in oil fumes from the air inlet (3), characterized in that: An oil filter screen (5) is installed at the air inlet (3). A condenser plate (6) is installed on the back side of the oil filter screen (5) in the smoke collection area (2) along the direction of oil smoke flow. An annular air inlet area (7) is formed between the condenser plate (6) and the smoke collection area (2) so that the oil smoke flows around the edge of the condenser plate (6) and enters the air inlet (3) to achieve secondary separation.

2. A range hood with a two-stage oil fume separation function according to claim 1, characterized in that: The projected area of ​​the condenser plate (6) is 80% to 90% of the projected area of ​​the smoke collection area (2).

3. A range hood with a two-stage oil fume separation function according to claim 1, characterized in that: The top two sides of the condenser plate (6) are provided with hinge seats (8). The top of the condenser plate (6) is installed in the smoke collection area (2) through the hinge seats (8). The hinge seats (8) allow the condenser plate (6) to rotate around the hinge seats (8).

4. A range hood with a two-stage oil fume separation function according to claim 1, characterized in that: The bottom of the condenser plate (6) is provided with ball bearing seats (9) on both sides, and the bottom of the condenser plate (6) is detachably installed in the smoke collection area (2) through the ball bearing seats (9).

5. A range hood with a two-stage oil fume separation function according to claim 1, characterized in that: The air inlet (3) is provided in two places, which are arranged symmetrically on the left and right.

6. A range hood with a two-stage oil fume separation function according to claim 1, characterized in that: The smoke collection area (2) is a trapezoidal concave cavity with a larger outer surface and a smaller inner surface, with the opening facing downwards or forwards.

7. A range hood with a two-stage oil fume separation function according to claim 1, characterized in that: The condenser plate (6) is made of glass or metal sheet.

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