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Range hood solution
Range hood, also known as range hood, is a kitchen appliance that purifies the kitchen environment. It is installed on the top of the kitchen stove, which can quickly take away the waste burned by the stove and the oil fume harmful to the human body produced during the cooking process, and discharge it to the outside. At the same time, it condenses and collects the oil fume to reduce pollution and purify the air. protection role.
In order to cope with kitchen fumes, range hoods have emerged as the times require. Range hoods have become a must-buy electrical product in modern home kitchens. As an important part of modern families, it not only shoulders the heavy responsibility of cleaning kitchen fumes, but also protects people's health. a powerful tool.
Range hoods can be divided into three types: one is Chinese-style hoods, the other is European-style hoods, the third is side-suction hoods, and the fourth is smart hoods. It can also be divided into top row type, side row type and bottom row type.
1. The principle of the range hood scheme
The range hood is installed on the upper part of the stove, connected to the power supply of the range hood, and drives the motor to make the wind wheel rotate at a high speed, so that a negative pressure area is formed in a certain space above the stove, and the indoor fume gas is sucked into the range hood. After being filtered by the oil screen, the oil fume is separated for the first time, and then enters the inside of the hood air duct, and the oil fume gas is separated for the second time through the rotation of the impeller. The oil fume in the fan cabinet is subjected to centrifugal force, and the oil mist condenses into oil The droplets are collected into the oil cup through the oil circuit, and the purified flue gas is finally discharged along the fixed channel.
1. Power source of range hood
The power part of the range hood is designed on the side of the machine body, the purpose is to keep the oil pollution and the core components of the hood in a state of isolation. After the wind wheel on the side is fed into the wind, a certain air flow will be formed to compress the air through a special cavity. After the air is compressed and accelerated, it enters the annular wind. In the chamber, the inner chamber controls the airflow to flow out at the same time. The width of the air outlet and the angle of the air outlet directly affect the Kohn and Da effect, thus affecting the overall air volume. Specially constructed cavity, the cavity is thicker towards the front side of the air supply, and thinner on the opposite side, the air flow in the cavity will exceed the normal air pressure outside the cavity after being squeezed, and the cavity with a wide upper end and a narrower end will force the internal air flow to the lower end The narrow cavity moves, and the air that is constantly "squeezed" can only be squeezed out from the upper end. This structure can continuously strengthen the air supply pressure, make the air flow at the air outlet faster, and form a strong air pressure difference inside and outside to ensure the air pressure difference. At the same time, a negative area with a large pressure difference is generated in the range hood shell, and a strong suction force is generated near the suction panel of the range hood.
2. The negative pressure principle of range hood
Due to the viscous effect of the oil fume, the surface of the oil suction chamber will generate a frictional force tangential to the chamber surface. The design of the fluid surface of the chamber can effectively reduce the pressure difference resistance. Under the condition of the same windward area, such a chamber pressure The differential resistance is the least. In addition to the windward side and shape of the cavity, the position of the cavity in the airflow also affects the size of the pressure differential resistance. The structure of the compression chamber is designed to be in an annular semi-closed state with a wide upper end and a narrower lower end. Oil will not enter it. The air outlet is designed to be inclined at an angle to achieve the most ideal fluid angle of attack. Increase. The structure of the negative pressure cavity in the hood casing is designed into a ring-shaped closed shape with a narrow upper end and a wider lower end through fluid analysis. It works in a vertical state with small pressure difference resistance and plays the role of air diversion.
The interior of the range hood is a negative pressure cavity. The structure of the cavity needs to fully consider the fluidity of the lampblack. Whether the surface of the cavity is smooth and whether the accumulated oil is easy to remove will affect the air flow in the casing. Moreover, the possibility of turbulent flow needs to be considered.
The air is sucked in through the air inlet on the side, and the impeller on the side ejects the air in a circular trajectory, finally forming an uninterrupted air flow. Since the air passes through a cavity and is forced to blow out from this annular ring, the amount of air passing through is much larger than that at the original air inlet, and the air output generated by it is more stable, because there is no impeller to "cut" the air, no There will be turbulent flow during the use of range hood.
2. The solution to the loud noise of the range hood
1. The reason for the loud noise of the range hood
The range hood is mainly composed of a hood housing, a fan volute, a motor, and a fan impeller. The motor drives the fan impeller to rotate. The motor and the fan impeller are installed in the fan shell, and the fan volute is installed at the rear of the hood. When in use, the motor drives the fan impeller to rotate to cause vibration, and the connection between the motor and the range hood casing causes the casing to resonate, and the friction and impact of the air flowing in the fan also produces noise. Therefore, the noise sources of the range hood mainly include two reasons: the first is the noise of the fan itself, such as the noise generated; the second is the noise generated by the airflow. Through the statistical analysis of domestic and foreign patents, it is concluded that the method of reducing the noise of the range hood is mainly divided into two aspects: one is to improve the structure of the suction system; achieve the effect of noise reduction.
2. The method of reducing the noise of the range hood
1) The method of sound absorption/silence includes two aspects: the use of sound-absorbing materials and the setting of sound-absorbing panels; (2) the setting of shock-absorbing devices, which mainly achieve the effect of shock-absorbing through the setting of shock-absorbing materials; (3) Setting of fan volute, bellows, smoke guide structure and installation of fan/motor; (4) Noise reduction treatment for smoke exhaust pipe.
Through the above-mentioned different forms of noise reduction, the effect of "static braking" of the range hood is realized. At the same time, in the noise reduction of the range hood, the improvement of the structure and the way of sound absorption/silencing occupy the vast majority of the selection of the noise reduction method.
The noise reduction method of the range hood starts with the use of sound-absorbing materials. The researchers then developed the installation of the motor, the sound-absorbing plate, the improvement of the volute structure, the diversion device and even the coexistence of various noise reduction methods, so that the range hood can realize " "Static braking" effect. In the future, sound-absorbing materials will develop in two aspects: how to improve safety and service life; other noise reduction methods have gradually matured, but with the continuous improvement of people's living standards, the requirements for "quietness" are becoming more and more intensified. Because of the strong, based on this demand, range hoods with better noise reduction effects will also be developed.
3.The brand selection of range hood
A brand is the accumulation of consumer recognition and trust, and a sign that a product can be trusted. In comparison, range hoods of well-known brands have guaranteed quality and considerate after-sales service. Don't blindly pursue new products and new models, try to buy classic styles with large sales volume, mature models will bring you peace of mind. For example, touch switches, although beautiful, are often expensive and easy to break, while mechanical switches have a low maintenance rate and high replaceability, and can be repaired if broken.
For the home appliance industry with fierce competition and thin profits, big brands not only embody advantages in various aspects such as products and services, but also have a high degree of professionalism and a deep grasp of consumer demand formed in this field for a long time. In addition, due to shouldering the reputation and image of the entire group brand, the first thing a big brand considers in the production and sales of any product is the honor and responsibility of the entire brand. This will prompt them to pay more attention to the improvement of their own technology and the optimization of product functions, especially in the service level that consumers care about, and the advantages of big brands are more obvious. According to incomplete statistics, there are more than 400 smoking machine brands on the market, but the truly trustworthy ones are those big brands with profound accumulation in technology and market, including professional manufacturers and major appliance brands. Promotional opportunity to sell, very affordable.
4.What kind of range hood is suitable
After considering the type of range hood, you should also pay attention to the core components of the range hood when you actually buy it in the store. Only in this way can we select high-quality products.
1. The product quality of the range hood.
The most important part of the range hood is the motor that drives the wind wheel. At present, the quality of domestically produced motors can fully meet the design requirements of the range hood. When purchasing, do not blindly believe in imported motors, which will increase the purchase cost. The bearing is an important part of the motor. When purchasing, pay attention to choosing a motor with double ball bearings. It has a longer life and lower noise. In addition, you should choose a range hood equipped with an all-metal plastic-sprayed fan wheel. It is durable, stable in performance, and conducive to the separation of oil fumes. When purchasing, press the motor start switch repeatedly to compare the running sound after the motor is started and shut down. The noise is as small as possible. The smoke hood should have as few seams and grooves as possible, leaving no room for dirt. You can ask to turn it on and listen to the noise, and use your hands to feel if there is any air leakage around. If you have any doubts in your mind, you should ask the shopping guide in time. The more vague the answer, the more detailed cross-examination is necessary.
2. Motor power of range hood.
Suction is an important functional index of the range hood, the size of the suction directly affects the smoking effect of the range hood, the greater the motor power, the greater the suction. If you are not familiar with the technical indicators of motor power, then when purchasing. It can be judged by personal intuitive feeling. Sometimes, the guide of the mall will show you some demonstrations, such as putting a piece of paper under the range hood and turning on the motor. The paper will be quickly and tightly adsorbed on the air suction port. In fact, almost all range hoods can achieve this effect, so it is not easy for you to judge the size of the suction force. The easiest way is to test with bare hands. First, turn on the range hood, put your hand near the air suction port, and feel if there is any downwind; put your hand at the air outlet, and feel the wind force; put your hand at the seam of the cabinet , Screw mouth, check whether there is air leakage. The range hood with no wind, no air leakage, and strong wind produces high and uniform negative pressure, and the smoke exhaust effect is relatively good. Those range hoods that can absorb paper may not necessarily have the best smoke exhaust effect, and the best smoke exhaust effect is the balanced smoke exhaust type.
3. Choose the right range hood according to the kitchen area
Choose the range hood according to the size of the kitchen and the amount of oil fume. Tested by the national quality inspection department, the general working power of range hoods currently on the market does not exceed 200w, and the exhaust air volume does not exceed 16.5Pa. In addition, there must be a wind pressure higher than 180Pa to form an effective suction force. As for the noise national standard is not allowed to exceed 68dB. European style is the choice of families who do not often cook, and those who love Chinese food culture had better consider deep-hood range hoods. Generally speaking. The greater the power of the motor, the greater the exhaust air volume, and the more oily fumes are emitted.
4. After-sales service for range hoods.
The main accessories of range hoods include motors, bearings, impellers, panels, etc. The quality of the motor directly affects the effect and noise of the range hood; the quality of the bearing is directly related to the life of the range hood and the size of the noise. The metal impeller is more durable and can reduce noise more effectively. Separation is also better: glass and stainless steel panels require less effort to scrub. Range hoods deal with oil fumes all day long, so they need to be cleaned sooner or later.
5. Installation, use and maintenance of range hood
Buying a satisfactory range hood is not the end of the matter, and the follow-up steps are also the key to determining whether the range hood can function in daily use.
First of all, pay attention to choose the appropriate height when installing. Angle and direction of exhaust pipe. The center of the range hood should be aligned with the center of the stove, and the left and right should be on the same horizontal line. It is best for the suction hole to directly face the furnace eye below. The installation height of the range hood should not be too high, so as not to hinder the operation of people's activities as the standard, generally 65cm-75cm above the stove is better.
In order to make the discharged dirty oil flow into the oil collection cup, there must be an elevation angle before and after installation, that is, the front end of the body facing the operator should be raised by 3-5°C. This is especially the case when the range hood must be mounted on a window, or where other supporting feet are not available.
The exhaust pipe of the range hood should be as short as possible and avoid too many turns, and the turning radius should be as large as possible, so that the air can be released smoothly, the smoking effect is good and the noise is reduced. When installing in a public flue with a check valve, you must first check whether the check valve can be opened and working normally. The power socket of the range hood must use a special socket with a reliable ground wire. Turn on the power first, then turn on the lighting, and perform specific operations according to the situation. The power of the bulb should be less than 40 to ensure the stability of the motor power.
Before cooking, the range hood should be turned on in advance to ensure the effect of removing oil fume. When using the range hood, keep the air circulation in the kitchen, which can prevent the air in the kitchen from forming negative pressure and ensure its suction capacity. Choose an appropriate speed for the range hood. For example, when cooking dishes with a lot of oily smoke, you should choose a higher speed. After cooking, keep the fan blades running for a while, let the oily smoke be completely removed, and then turn off the machine.
The range hood also needs constant maintenance, and regular cleaning is more important. After mastering the above range hood installation and use skills, I believe that your range hood can play its own role, create a healthy, clean and comfortable cooking environment for you, and keep the lampblack completely away.
6.How to clean the range hood
1. Clean the range hood body
Before using the new range hood bought back, sprinkle a thin layer of soap powder in the two oil storage boxes, and then inject about one-third of the water, so that the recovered oil floats on the water surface, and the It's not that it condenses on the wall of the box, wait until the waste oil is almost full, pour it out, and then cook it in the same way.
2. Clean the oil storage box of the range hood
The top layer of the waste oil in the oil storage box of the range hood is filtered out, which is the "best oil remover" for cleaning the stains on the ventilation fan, stove and range hood. The specific method is to use a rag or towel to dip the waste oil and apply it to the oil stain, soak it for about half a minute, wipe it off with a cloth, and then wipe it with a clean scouring pad. At this time, the body of the range hood is bright enough "Look in the mirror".
3. Clean the oil screen
The oil screen protecting the fan blades can be slowly removed with a screwdriver, sprayed with cleaning agent, put it in a plastic bag, let it stand for 15 minutes, take it out, pour 80°C hot water into the basin, and clean it carefully with a rag. If the grease on the oil net is very thick, you can also use a thin bamboo piece to gently scrape off part of the grease and then clean it.
4. Clean the fan blades of the range hood
After covering the countertop under the range hood with newspaper, spray the range hood on the fuselage and fan blades, turn on the range hood after a few minutes, use the centrifugal force of the fan to suck out the range hood and the dissolved dirty oil, and then use wet Wipe it with a paper towel once, and the cleaning of the fuselage and fan blades can be done at home, but the lampblack cleaner is a chemical product after all, which has a certain irritating effect on the skin and respiratory mucous membranes, so it is better to use it sparingly.
The above are the details of the range hood solution introduced by Shenzhen Zuchuang Microelectronics Co., Ltd. for you. If you have electronic function development needs for range hoods, you can trust us. We have rich experience in customized development of electronic products, and can evaluate the development cycle and material prices as soon as possible. We are a number of chip agents at home and abroad, including MCU, voice IC, Bluetooth IC and modules, wifi modules. Our development capabilities cover PCB design, single-chip microcomputer development, software custom development, APP custom development, WeChat official account development and other hardware and software design. It can also undertake the research and development of smart electronic products, household appliances scheme design, beauty equipment development, Internet of Things application development, smart home scheme design, TWS scheme development, Bluetooth audio development, children's toy scheme development, and electronic education product development.
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