CN106765415A - Based on PM2.5 concentration and clearance control air quantity and the energy-conservation air-curtain type lampblack absorber closed - Google Patents

Abstract

The invention discloses an energy-saving air curtain type range hood for controlling air volume and closing based on PM2.5 concentration and removal rate. Including smoke exhaust duct, frequency conversion oil fume centrifugal fan, air curtain axial flow fan, PM2.5 detector and PLC controller; air curtain axial flow fan is installed on one side of the range hood shell, and is set on the front surface of the range hood shell There is a PM2.5 detector and a human-computer interaction panel, which can display the fan air volume and PM2.5 concentration in real time; the frequency conversion oil fume centrifugal fan is installed on the upper boundary of the range hood shell and connected to the exhaust air duct; the frequency conversion oil fume centrifugal fan and air curtain Axial fans, PM2.5 detectors and man-machine interaction panels are connected to PLC controllers. The invention has the advantages of simple structure, high integration and strong pertinence, which not only protects the health of cooking operators, but also guarantees the quality of indoor air, and at the same time provides intuitive evaluation indicators for cooking personnel, and has good social practical value.

Description

Energy-saving air curtain oil with control of air volume and closing based on PM2.5 concentration and removal rate hood

technical field

The invention relates to the field of kitchen appliances, in particular to an energy-saving air curtain type range hood that controls air volume and shuts down based on PM2.5 concentration and removal rate.

Background technique

The range hood has been widely used as an electrical appliance for air purification in the home kitchen. Through the high-speed rotation of the centrifugal fan of the range hood, the fan turbine is driven to rotate, forming a negative pressure area near the smoke collection chamber, and then sucking the range hood into the inner cavity of the range hood and discharging it Outdoors, reduce indoor air pollution levels. However, most of the range hoods currently on the market simply set several air volume working conditions, which cannot match the air volume of the range hood well according to the actual cooking situation, so excessive and unnecessary fan energy consumption is often generated; in addition, because there is no Objective and practical judgment indicators, users are still confused when choosing the range hood air volume gear, and cannot have a rational understanding of the kitchen environment; moreover, because the range hood is turned off after cooking, the indoor air quality in the kitchen is still relatively poor. Diffusion makes the environment of other functional rooms also be affected badly.

In view of the problems existing in the use of range hoods at present, the authorized public number CN2418397Y proposed improvement measures for range hood fans, and invented a range hood with frequency conversion, and the monitoring signal was transmitted to the microcomputer control center through the temperature monitoring unit and the smoke monitoring unit After the analysis and processing, adjust the fan frequency of the range hood so that the range hood can remove the indoor oil fume with an appropriate air volume. However, the smoke monitoring unit used in this invention only generally takes the oil fume as the control target, and does not analyze the main components of the kitchen oil fume. A more exact and practical control strategy is given; moreover, the range hood of this invention still does not consider the problem of air quality after cooking.

Contents of the invention

In order to solve the deficiencies in the application of existing range hoods, the present invention provides an energy-saving air-curtain range hood that controls air volume and shuts down based on PM2.5 concentration and removal rate. Concentration control variable frequency cooking fume centrifugal fan achieves the purpose of targeted adjustment of the range hood air volume and energy-saving standards; and in consideration of extreme cooking situations, cooking personnel are exposed to a large amount of cooking fume pollutants, so an air curtain is added around the range hood , to reduce the amount of fumes diffused to the breathing area of personnel, and achieve the benefits of protecting the health of personnel; furthermore, the PM2. Due to the influence of the diffusion of kitchen fumes on other functional rooms in the room.

For realizing above-mentioned effect, the technical scheme that the present invention takes is as follows:

An energy-saving air-curtain range hood that controls the air volume and shuts down based on PM2.5 concentration and removal rate; it includes a smoke exhaust duct, a variable-frequency oil fume centrifugal fan, an air-curtain axial fan, a PM2.5 detector, and a PLC controller; The feature is that the air curtain axial flow fan is installed on one side of the range hood shell, and a PM2.5 detector and a human-computer interaction panel are installed on the front surface of the range hood shell to display the fan air volume and PM2.5 concentration in real time; frequency conversion The oil fume centrifugal fan is installed on the upper boundary of the range hood shell and connected to the exhaust air duct; the frequency conversion oil fume centrifugal fan, air curtain axial flow fan, PM2.5 detector and human-computer interaction panel are connected to the PLC controller.

The smoke exhaust duct is connected to the fume collecting hood of the range hood, and the connection between the fume collecting hood of the range hood and the casing of the range hood is in the shape of a "back".

The air curtain tuyere is arranged at the joint between the range hood shell and the range hood fume collecting hood close to the personnel, and the air curtain tuyere is evenly divided into a plurality of openings by the partition to play the role of uniform air flow.

The human-computer interaction panel is provided with a keyboard touch switch device.

The PM2.5 detector is embedded in the center of the front of the range hood housing.

The frequency conversion oil fume centrifugal fan is installed at the center of the upper interface of the range hood housing, and is flush with the upper interface of the range hood housing, and exhausts the oil fumes from the fume collecting hood to the outdoor.

The control method of the air curtain type range hood based on the PM2.5 concentration and removal rate of the present invention to control the air volume and shut down; the human-computer interaction panel sends a signal 1 to the PLC controller, and the PM2.5 detector detects the PM2 near the breathing area of the human body .5 concentration, and transmit the concentration signal 2 to the PLC controller; according to the fan frequency in the corresponding concentration change interval preset in the PLC controller, after the PLC controller processes and judges the signal, with the help of the PLC controller and The connection relationship between the frequency conversion oil fume centrifugal fan and the frequency conversion oil fume centrifugal fan control signal 3 are given to control the frequency of the frequency conversion oil fume centrifugal fan to achieve the purpose of controlling the air volume of the fan; if the air volume of the range hood reaches the maximum value, the concentration of the measuring point exceeds the set value The upper limit value of the fixed interval, at this time, through the signal feedback, the PLC controller sends an execution signal 4 to the air curtain axial flow fan to control the opening of the air curtain axial flow fan, and after the air is sent into the inner cavity of the range hood, it passes through the air curtain The tuyere is sprayed out to form an air curtain to reduce the spread of oil fume to the breathing area of personnel and achieve the purpose of protecting the health of personnel. When the detected PM2.5 concentration is lower than the set upper limit, the PLC controller will flow axially to the air curtain The fan sends a shutdown signal and executes the shutdown command operation.

After cooking, by pressing the off button of the piano key touch device, the delay shutdown system is started, and the PLC controller is switched to the control module for detecting and analyzing the removal rate of PM2.5. When the average value is lower than the set value, then Automatically shut off the range hood.

Combined with kitchen fume components, the range hood of the present invention takes the PM2.5 concentration value as the control index, uses the PM2.5 detector to detect the PM2.5 concentration value of the environment near the breathing area of the cooking staff, and regulates it through the PLC controller in a targeted manner Change the air volume of the frequency conversion centrifugal fan for range hood to adapt to different cooking situations and reduce the energy consumption of the range hood; use the PLC controller to control the opening and closing of the air curtain axial flow fan to effectively ensure the health and safety of personnel; after starting the range hood to delay the shutdown system, Through the analysis of the PM2.5 removal rate by the PLC controller, the delayed shutdown of the variable frequency oil fume centrifugal fan ensures the quality of the kitchen air to the greatest extent and reduces the impact of the kitchen oil fume on other functional rooms in the residential suite; in addition, through human-computer interaction The PM2.5 concentration value displayed on the panel enables cooking staff to have a more intuitive understanding of the kitchen environment. The invention has simple structure, high integration and strong pertinence, which not only protects the health of cooking operators, but also guarantees the quality of indoor air, and at the same time provides intuitive evaluation indicators for cooking personnel, and has good social practical value.

Description of drawings

The structural representation of Fig. 1 range hood of the present invention;

Figure 2(a) PM2.5 mass concentration during the experimental cooking process;

Figure 2(b) Removal rate of PM2.5 mass concentration after cooking;

Figure 2(c) Removal rate of PM2.5 mass concentration after cooking (five-year sliding average);

Figure 3 is a schematic diagram of device connection and signal transmission flow.

detailed description

The present invention will be further introduced according to specific embodiments below:

As shown in Figure 1, the range hood mainly includes a range hood housing 10, a variable frequency range hood centrifugal fan 11, a range hood inner cavity 12, an air curtain axial flow fan 13, an air curtain tuyere 14, a human-computer interaction panel 15 and PM2. 5 Detector 16, smoke exhaust duct 17, range hood smoke collection hood 18. The measuring point of the PM2.5 detector is arranged in front of the range hood shell, closest to the breathing area of the personnel; the variable frequency oil fume centrifugal fan is connected to the PLC controller, and several corresponding concentration changes are set in the PLC controller in advance. The frequency of the fan in the interval is controlled by the monitored PM2.5 concentration to control the frequency of the variable frequency oil fume centrifugal fan; the air curtain axial flow fan is embedded on one side of the range hood shell, and its start and stop conditions are pre-defined in the PLC controller The program control in the range hood is also inlaid with a man-machine interaction panel in front of the range hood housing, which displays the fan air volume and PM2.5 concentration value in real time, and can use the touch device to manually turn on and off the variable frequency range hood centrifugal fan to delay shutting down the system.

A specific example is given below to illustrate the present invention, but specific dimensions and positions are not the only requirements, and are changing and recombining according to specific conditions. All similar replacements and modifications are obvious to those skilled in the art. All are considered to be included in the spirit, scope and content of the present invention.

Example:

The overall size of the range hood housing 10 is 696mm in length, 495mm in width at the bottom, 390mm in width at the top, and 340mm in height, and the range hood is installed against the wall; The distance between its lower edge and the lower edge of the range hood shell is 30mm. The upper surface of the range hood is 350mm long and 300mm wide. The air curtain tuyere 14 is arranged at the connection between the body and the fume collecting hood of the range hood close to the personnel, as shown in Figure 1, the length of the air curtain tuyere is 636mm of the length of the fume collecting hood of the range hood, and the width is 3mm, and the air curtain tuyere is separated by 40mm every 40mm. The partition is evenly divided into multiple openings to distribute the air flow evenly; the air curtain axial flow fan 13 is embedded on one side of the range hood shell, and the common constant air volume axial flow fan on the market can be used, and its opening status is directly Controlled by a PLC controller; the man-machine interaction panel 15 is set on one side of the front of the range hood housing (set on the right side as shown in the figure), and has a real-time display function of PM2.5 concentration and range hood air volume, and is equipped with a keyboard touch The switch device, in addition, the PLC controller 19 is embedded on the back of the man-machine interaction panel; the PM2.5 detector 16 is installed in the inner cavity of the range hood, and is embedded at the center of the front of the range hood shell, 100mm away from the lower boundary of the range hood shell, A commercially available PM2.5 detector can be used; the frequency conversion oil fume centrifugal fan 11 flows according to the air flow of the oil fume, is installed at the center of the upper interface of the range hood shell, is level with the upper interface of the range hood shell, and passes through the range hood shell. The smoke exhaust duct 17 at the center of the surface discharges the oil fumes to the outside from the smoke collection hood.

As shown in Figure 2(a), during the experimental cooking (cooking potato shreds), the concentration of PM2.5 in the oil fume showed a trend of rising first, then falling and finally reaching a stable level. Using this feature, the removal rate of PM2.5 after cooking For analysis, in order to reduce the processing load of the PLC controller, the range hood of the present invention uses the concentration change rate of adjacent measuring points as the PM2.5 removal rate. As shown in Figure 2(b), it is not difficult to find that the overall removal rate is from high to low, and finally reaches a stable state. Combined with Figure 2(a) and Figure 2(b), the removal rate of PM2.5 is carried out for 5 years. Calculate the average value, as shown in Figure 2(c), it can be found that the removal rate is more stable throughout the process, so set an upper limit (such as 0.4mg/h) as the threshold for controlling the shutdown of the range hood. If the moving average value is lower than this limit value, the PLC controller will send a signal to turn off the frequency conversion oil fume centrifugal fan.

As shown in Figure 3, the human-computer interaction panel is connected to the PLC controller. When the personnel start cooking, by pressing the start button of the keyboard touch device on the human-computer interaction panel, a signal 1 is sent to the PLC controller. At this time, each sensor The components are in working condition; the PLC controller is connected with the PM2.5 detector. During the cooking process, the PM2.5 detector detects the concentration of PM2.5 near the human breathing area, and transmits the concentration signal 2 to the PLC control device. Pre-set several fan frequencies corresponding to the concentration range in the PLC controller (according to the PM2.5 concentration value from 0-0.5mg/ ^m3 , ten intervals are equally divided into ten intervals, and each time the concentration increases by one level, the frequency conversion oil fume centrifugal The frequency of the fan is increased by 10% of the highest frequency), after the PLC controller judges the signal operation and processing, with the help of the connection relationship between the PLC controller and the frequency conversion oil fume centrifugal fan, the control signal 3 of the frequency conversion oil fume centrifugal fan is given to control the frequency conversion oil fume centrifugal fan The frequency of the fan is used to achieve the purpose of controlling the air volume of the fan.

Under extreme cooking conditions, if the concentration of the measuring point exceeds the upper limit of the set range when the air volume of the range hood reaches the maximum value, at this time, the feedback of the signal depends on the connection between the PLC controller and the air curtain axial flow fan (as shown in Figure 3 shown), the PLC controller sends an execution signal 4 to the air curtain axial flow fan to control the opening of the air curtain axial flow fan, and after the air is sent into the inner cavity of the range hood, it is sprayed out through the air curtain tuyere to form an air curtain. Reduce the diffusion of oil fumes to the breathing area of personnel within a short time, so as to protect the health of personnel. When the detected PM2.5 concentration is lower than the set upper limit, the PLC controller will send a shutdown signal to the air curtain axial flow fan to execute Close command action.

After cooking, press the off button of the piano key touch device to start the delay shutdown system, switch the PLC controller to the control module for detecting and analyzing the PM2.5 concentration decay rate, and perform the 5-year sliding average and set value When the sliding average of several consecutive (for example, 3) years is lower than the set value, it is considered that the indoor PM2.5 concentration has dropped to the lowest value, and the range hood will be automatically turned off.

The energy-saving air-curtain range hood disclosed and proposed by the present invention based on PM2.5 concentration and removal rate to control the air volume and shut down can be realized by those skilled in the art by referring to the content of this article and appropriately changing the conditions. Although the method and preparation of the present invention The technology has been described through preferred implementation examples, and it is obvious that those skilled in the art can modify or recombine the methods and technical routes described herein without departing from the content, spirit and scope of the present invention to realize the final preparation technology. In particular, it should be pointed out that all similar substitutions and modifications will be obvious to those skilled in the art, and they are all considered to be included in the spirit, scope and content of the present invention.

Claims (9)

1. An energy-saving air-curtain range hood that controls air volume and shuts down based on PM2.5 concentration and removal rate; including exhaust air duct, frequency conversion oil fume centrifugal fan, air curtain axial fan, PM2.5 detector and PLC controller ; It is characterized in that the air curtain axial flow fan is installed on one side of the range hood shell, and a PM2.5 detector and a human-computer interaction panel are installed on the front surface of the range hood shell to display the fan air volume and PM2.5 concentration in real time , The frequency conversion oil fume centrifugal fan is installed on the upper boundary of the range hood shell and connected to the exhaust air duct; the frequency conversion oil fume centrifugal fan, air curtain axial flow fan, PM2.5 detector and human-computer interaction panel are connected to the PLC controller. 2. The range hood according to claim 1, characterized in that the exhaust air duct is connected to the range hood fume collection hood, and the connecting part between the range hood fume collection and the range hood shell is in the shape of a "back". 3. The range hood according to claim 2, characterized in that an air curtain tuyere is arranged at the connection between the range hood shell and the fume collecting hood of the range hood close to the personnel, and the air curtain tuyere is evenly divided by a partition to form a plurality of openings , to play the role of uniform airflow. 4. The range hood as claimed in claim 1, characterized in that the human-computer interaction panel is provided with a keyboard touch switch device. 5. The range hood according to claim 1, characterized in that it is provided with a PM2.5 detector embedded in the center of the front of the range hood housing. 6. The range hood according to claim 1, characterized in that the variable frequency range hood centrifugal fan is installed at the center of the upper interface of the range hood housing, and is level with the upper interface of the range hood housing, and passes through the center of the upper surface of the range hood housing. The air exhaust flue removes the oil fume from the room. 7. Utilize the control method of claim 1 based on the PM2.5 concentration and removal rate to control the air volume of the range hood and close the air curtain type range hood, characterized in that: the human-computer interaction panel sends a signal 1 to the PLC controller, and the PM2. 5 The detector detects the concentration of PM2.5 near the human breathing area, and transmits the concentration signal 2 to the PLC controller; according to the fan frequency corresponding to the concentration change interval in the PLC controller, the signal is processed and judged by the PLC controller Finally, with the help of the connection relationship between the PLC controller and the frequency conversion oil fume centrifugal fan, the control signal 3 of the frequency conversion oil fume centrifugal fan is given to control the frequency of the frequency conversion oil fume centrifugal fan to achieve the purpose of controlling the air volume of the fan; if the air volume of the range hood reaches the maximum value The concentration of the measuring point exceeds the upper limit of the set interval. At this time, through the signal feedback, the PLC controller sends an execution signal 4 to the air curtain axial flow fan to control the opening of the air curtain axial flow fan and send air into the range hood After the inner cavity, it is sprayed out through the air curtain outlet to form an air curtain to reduce the diffusion of oil fumes to the breathing area of personnel and achieve the purpose of protecting personnel health. When the detected PM2.5 concentration is lower than the set upper limit, the PLC will The controller sends a shutdown signal to the air curtain axial flow fan, and executes the shutdown command operation. 8. The method according to claim 7, characterized in that the PM2.5 concentration change and fan frequency are set in the PLC controller: according to the PM2.5 concentration value, ten intervals are equally divided from 0-0.5mg/ ^m3 , each time the concentration increases by one level, the frequency of the frequency conversion lampblack centrifugal fan increases by 10% of the highest frequency. 9. The method as claimed in claim 7, characterized in that after the cooking is finished, by pressing the off button of the piano key touch device, the delay closing system is started, and the PLC controller is switched to the method of detecting and analyzing the PM2.5 concentration decay rate. The control module automatically turns off the range hood when the average value is lower than the set value.