Efficient range hood

Abstract

An efficient range hood comprises a main body, the front end of the main body is concaved inwards to form a containing cavity, an air cabinet is installed on the top of the main body, and the efficient range hood is characterized in that the upper end of the containing cavity is covered with a fixed panel, the lower end of the containing cavity is covered with a movable panel, a smoke suction opening is formed in the back of the movable panel, a smoke guide pipe is further arranged in the containing cavity, and a smoke outlet is formed in the upper end of the smoke guide pipe. A smoke outlet in the top of the smoke guide pipe is in butt joint with the air cabinet, a smoke inlet in the bottom of the smoke guide pipe is in butt joint with the smoke suction port, and the circulation section of the smoke guide pipe is gradually increased from the smoke outlet to the smoke inlet. The air duct system has the beneficial effects that the air duct system adopts a gradually-changing structural design with a large lower part and a small upper part, namely, the sectional area of the air duct is gradually reduced from the smoke inlet at the lower part to the smoke outlet at the upper part. According to the law of conservation of mass, under the continuous condition of flowing fluid, the airflow speed in the air duct is inversely proportional to the sectional area. As the sectional area of the upper part of the air duct is small, the flowing speed of airflow in the area is higher.

Description

Technical Field

[0001] The utility model relates to a range hood, in particular to a high-efficiency range hood. Background Art

[0002] As people prioritize their living environment and health, kitchen fumes have become a significant concern in daily life. As an essential kitchen appliance, the range hood's primary function is to absorb and exhaust cooking fumes, reducing their impact on the kitchen environment and human health. Existing range hoods typically rely on internal fans to draw in fumes and expel them through air ducts. However, existing range hoods often suffer from technical flaws in their air duct designs, impacting their exhaust effectiveness and efficiency.

[0003] 1. Uniform duct design leads to insufficient pressurization: Most range hoods currently on the market feature a uniform duct structure, meaning the duct's cross-sectional dimensions remain constant from the smoke inlet to the smoke outlet. While this design is simple to manufacture, it has significant practical drawbacks. Uniform ducts cannot effectively regulate pressure fluctuations during smoke flow, resulting in a failure to achieve effective pressurization.

[0004] Due to the lack of pressurization, the flow of oil smoke in the air duct may slow down, especially in long ducts. The smoke resistance gradually increases, resulting in poor oil smoke discharge, some oil smoke may be trapped in the air duct, and even smoke backflow. This not only reduces the operating efficiency of the range hood, but also increases the difficulty of cleaning the air duct and shortens the service life of the range hood.

[0005] 2. Low fume extraction efficiency: The uniform cross-section duct design cannot be optimized for flue gas flow requirements, resulting in eddies and turbulence in the flue gas as it passes through the duct. This further increases the flow resistance of the flue gas and affects the smooth exhaust of the fume. This is especially true when cooking at high power or for long periods of time, as the amount of fume is high. Uniform cross-section ducts are unable to cope with the high load demand, which may result in some fume not being exhausted in time and spreading into the kitchen environment, reducing the effectiveness of fume extraction.

[0006] 3. High energy consumption and noise: Due to the lack of a pressurized design within the air duct, the fan must increase power to compensate for the lack of exhaust efficiency, resulting in increased energy consumption. Furthermore, high fan power operation can also cause increased noise, impacting the user experience. Long-term high power operation can also negatively impact the fan's service life, increasing maintenance and replacement costs. Therefore, further improvements are necessary. Utility Model Content

[0007] The purpose of the utility model is to overcome the shortcomings of the existing technology and provide a high-efficiency range hood with a simple structure, easy use, and the ability to effectively improve the smoke extraction efficiency of the range hood and reduce energy consumption.

[0008] The purpose of the utility model is achieved by the following manner: a high-efficiency range hood, comprising a main body, the front end of the main body being concave to form a accommodating cavity, a wind cabinet being installed on the top of the main body, and characterized in that the upper end of the accommodating cavity is covered with a fixed panel, the lower end of the accommodating cavity is covered with a movable panel, a smoke outlet is provided on the back of the movable panel, and the movable panel is flipped under the drive of a power mechanism to open or close the smoke outlet;

[0009] A smoke guide pipe is also provided in the accommodating cavity. The smoke outlet at the top of the smoke guide pipe is connected to the wind cabinet, and the smoke inlet at the bottom is connected to the smoking port. The flow cross-section of the smoke guide pipe is gradually increased from the smoke outlet to the smoke inlet.

[0010] Furthermore, the smoking port is arranged to be tilted downward, and a guide plate is provided between the bottom of the smoking port and the bottom of the accommodating cavity.

[0011] Furthermore, the inclination angle of the smoking port is set at 45°-60°.

[0012] Furthermore: the smoke guide pipe is arranged in a rectangular trumpet shape with gradually changing width.

[0013] Furthermore, the two sides of the smoking port are connected to the two side walls of the accommodating cavity, the bottom of the smoking port is connected to the bottom of the accommodating cavity, and the front of the smoking port is connected to the front end surface of the accommodating cavity.

[0014] The beneficial effects of the utility model are: 1. Simple structure, low production cost and improved market competitiveness.

[0015] 2. The air duct system of the present invention adopts a gradient structural design with a larger bottom and a smaller top. That is, the cross-sectional area of the air duct gradually decreases from the lower smoke inlet to the upper smoke outlet. According to the law of conservation of mass, under the condition of continuity of the flowing fluid, the airflow velocity in the air duct is inversely proportional to the cross-sectional area. Since the cross-sectional area of the upper part of the air duct is smaller, the airflow velocity in this area is faster. The increase in airflow velocity not only accelerates the discharge of oil smoke, but also effectively reduces the stagnation time of smoke in the air duct, avoids the occurrence of smoke backflow, and significantly improves the overall working efficiency of the range hood.

[0016] 3. The air duct design of this utility model also fully utilizes Bernoulli's principle, which states that as air velocity increases within the duct, pressure decreases accordingly. Because the air velocity in the upper portion of the duct is higher, the pressure in this area is lower. In contrast, the lower portion of the duct, due to its larger cross-sectional area, experiences lower air velocity and higher pressure. This pressure difference between the upper and lower portions creates a natural pressure gradient, encouraging high-pressure gas in the lower portion to flow toward the lower-pressure area above, further facilitating the removal of oil smoke.

[0017] 4. In the air duct system of this utility model, an air deflector is fixedly mounted on the range hood housing. This deflector effectively guides airflow along a pre-set path, avoiding eddies and backflows caused by turbulent airflow in traditional air ducts. By optimizing the airflow path, airflow resistance is reduced, thereby lowering the range hood's energy consumption. Furthermore, the smoother airflow within the duct significantly reduces fan operating noise, improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is the general assembly drawing of the utility model structure.

[0019] Figure 2 This is a schematic diagram of the structure after the movable panel is opened in the utility model.

[0020] Figure 3 This is a schematic diagram of the structure after the hidden movable panel in the utility model.

[0021] Figure 4 This is a schematic diagram of the structure after the movable panel and the fixed panel are hidden in the utility model. DETAILED DESCRIPTION

[0022] The present invention will be further described below in detail with reference to the accompanying drawings. A high-efficiency range hood comprises a main body 1, the front end of the main body 1 being concave to form a receiving chamber 2, a wind cabinet 3 being mounted on the top of the main body 1, and characterized in that: the upper end of the receiving chamber 2 is covered with a fixed panel 4, the lower end of the receiving chamber 2 is covered with a movable panel 5, a smoke outlet 6 is provided on the back of the movable panel 5, and the movable panel 5 is flipped under the drive of a power mechanism to open or close the smoke outlet 6;

[0023] A smoke guide pipe 7 is also provided in the accommodating chamber 2. The smoke outlet at the top of the smoke guide pipe 7 is connected to the wind cabinet 3, and the smoke inlet at the bottom is connected to the smoking port 6. The flow cross-section of the smoke guide pipe 7 is gradually increased from the smoke outlet to the smoke inlet.

[0024] In one embodiment, the smoking port 6 is arranged to be tilted downward, and a guide plate 8 is provided between the bottom of the smoking port 6 and the bottom of the accommodating cavity 2 .

[0025] In one embodiment, the inclination angle of the smoking port 6 is set at 45°-60°.

[0026] In one embodiment, the smoke guide pipe 7 is arranged in a rectangular trumpet shape with a gradually changing width.

[0027] In one embodiment, the two sides of the smoking port 6 are connected to the two side walls of the accommodating chamber 2, the bottom of the smoking port 6 is connected to the bottom of the accommodating chamber 2, and the front of the smoking port 6 is connected to the front end surface of the accommodating chamber 2.

[0028] Working Principle: The range hood of the present invention includes a accommodating chamber located at the front end of the main body, the lower end of which is covered by a movable panel. A smoke outlet is provided on the back of the movable panel. Driven by a power mechanism, the movable panel can be flipped to open or close the smoke outlet. When the user turns on the range hood, the power mechanism drives the movable panel to flip to the open position, and the smoke outlet opens accordingly, starting to absorb the fumes generated during cooking. When not in use, the movable panel rotates back to the closed position, and the smoke outlet automatically closes, preventing external air from flowing back and dust from entering the range hood, thereby keeping the kitchen environment clean.

[0029] The core innovation of this utility model lies in the design of its air duct system. The duct features a gradient structure, with a larger bottom and a smaller top. The cross-sectional area gradually decreases from the inhalation port to the smoke outlet. According to the law of conservation of mass, the airflow velocity within the duct is inversely proportional to the cross-sectional area. Therefore, as the cross-sectional area of the duct decreases, the airflow velocity in the upper part of the duct gradually increases.

[0030] The accelerated airflow not only expel fumes from the duct more quickly, but also, according to Bernoulli's principle, increased air velocity leads to a decrease in air pressure. Because the airflow in the upper part of the duct is faster and the pressure is lower, while the lower part of the duct, due to its larger cross-sectional area, has slower airflow and higher pressure, this pressure difference naturally creates a pressure gradient from bottom to top, forcing the lower high-pressure gas to flow toward the upper low-pressure area, further pushing the fumes out. This design significantly improves the range hood's exhaust efficiency and prevents fumes from stagnating and backflowing in the duct.

[0031] Furthermore, the smoke guide duct within the duct connects to the wind cabinet, and its flow cross-section gradually increases from the smoke outlet to the smoke inlet, forming a rectangular trumpet-like design with a gradually changing width. This design not only helps to smoothly guide oil smoke into the duct, but also minimizes airflow turbulence and eddy currents, ensuring smooth and efficient airflow through the duct. Furthermore, the shape of the smoke guide duct further complements the gradual duct structure, improving the speed and efficiency of oil smoke discharge.

[0032] The air deflector, fixed to the range hood's casing, guides the airflow along a predetermined path, preventing unnecessary vortices from forming within the duct. This design allows for smoother fume flow, reduces flow resistance, and thus lowers the range hood's energy consumption. Furthermore, due to the smoother airflow, range hood noise is significantly reduced, enhancing the user experience.

[0033] The various components of this utility model work together to enable the range hood to efficiently draw in and exhaust oil fumes. The flip design of the movable panel ensures flexible opening and closing of the intake port, effectively preventing air backflow and dust accumulation. The gradient air duct structure combined with the design of the smoke guide pipe accelerates the flow of oil fumes within the duct, utilizing the relationship between airflow velocity and pressure to form a favorable pressure gradient, greatly improving the exhaust efficiency of oil fumes. The guiding effect of the air guide plate further optimizes the airflow path, reducing energy consumption and noise.

[0034] In summary, the utility model realizes a high-efficiency, energy-saving and low-noise range hood system through reasonable structural design and application of scientific fluid mechanics principles. It has significant technical advantages and market competitiveness and can be widely promoted and used.

[0035] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and improvements shall fall within the scope of the present invention as claimed.

Claims

1. A high-efficiency range hood, comprising a main body (1), the front end of the main body (1) being concave to form a receiving cavity (2), and a wind cabinet (3) being installed on the top of the main body (1), characterized in that: The upper end of the accommodating chamber (2) is covered with a fixed panel (4), and the lower end of the accommodating chamber (2) is covered with a movable panel (5). A smoking port (6) is provided on the back of the movable panel (5). The movable panel (5) is flipped under the drive of a power mechanism to open or close the smoking port (6). A smoke guide pipe (7) is further provided in the accommodating chamber (2). The smoke outlet at the top of the smoke guide pipe (7) is connected to the wind cabinet (3), and the smoke inlet at the bottom is connected to the smoking port (6). The flow cross section of the smoke guide pipe (7) is gradually increased from the smoke outlet to the smoke inlet.

2. The high-efficiency range hood according to claim 1, characterized in that: The smoking port (6) is arranged to be tilted downward, and a guide plate (8) is provided between the bottom of the smoking port (6) and the bottom of the accommodating cavity (2).

3. The high-efficiency range hood according to claim 2, characterized in that: The inclination angle of the smoking port (6) is set at 45°-60°.

4. The high-efficiency range hood according to claim 1, characterized in that: The smoke guide pipe (7) is arranged in a rectangular trumpet shape with a gradually changing width.

5. The high-efficiency range hood according to claim 1, characterized in that: The two sides of the smoking port (6) are connected to the two side walls of the accommodating chamber (2), the bottom of the smoking port (6) is connected to the bottom of the accommodating chamber (2), and the front of the smoking port (6) is connected to the front end surface of the accommodating chamber (2).

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