阅读说明：本技术 一种基于piv技术的油烟机逃逸量的测试装置及方法 (Device and method for testing escape amount of range hood based on PIV technology ) 是由 刘俊杰 刘智琳 于 2020-11-18 设计创作，主要内容包括：本发明公开一种基于PIV技术的油烟机逃逸量的测试装置,包括油烟机安装装置、一套2D-3C PIV粒子图像测速系统、干扰装置；所述2D-3C PIV粒子图像测速系统包括一套大功率激光器系统、两台高信噪比的CCD相机及计算机采集系统；所述油烟机安装装置主要由多组导轨组成,采用不锈钢板材进行围挡并喷涂为黑色,以避免PIV拍摄过程中发生反射影响结果,所述油烟机安装装置还包括挂钩及实验用灶台；所述干扰装置,包括滑轨、滑轨平台和假人装置、电机、计算机控制系统。本发明提出了一种可以定量描述了油烟机侧面逃逸的方法,有效解决了难以评估油烟机排出效果的问题。(The invention discloses a device for testing the escape amount of a range hood based on a PIV technology, which comprises a range hood installation device, a set of 2D-3C PIV particle image speed measurement system and an interference device, wherein the range hood installation device is provided with a plurality of 2D-3C PIV particle image speed measurement devices; the 2D-3C PIV particle image speed measurement system comprises a set of high-power laser system, two CCD cameras with high signal-to-noise ratio and a computer acquisition system; the range hood mounting device mainly comprises a plurality of groups of guide rails, is surrounded by stainless steel plates and is sprayed in black to avoid reflection influence in the PIV shooting process, and further comprises a hook and an experimental cooking bench; the interference device comprises a slide rail, a slide rail platform, a dummy device, a motor and a computer control system. The invention provides a method capable of quantitatively describing escape of the side face of a range hood, and effectively solves the problem that the exhaust effect of the range hood is difficult to evaluate.)

1. A testing device for escape quantity of a range hood based on a PIV technology is characterized by comprising a range hood mounting device, a set of 2D-3C PIV particle image speed measuring system and an interference device; the 2D-3C PIV particle image speed measurement system comprises a set of high-power laser system, two CCD cameras with high signal-to-noise ratio and a computer acquisition system; the range hood mounting device mainly comprises a plurality of groups of guide rails, is surrounded by stainless steel plates and is sprayed in black to avoid reflection influence in the PIV shooting process, and further comprises a hook and an experimental cooking bench; the interference device comprises a slide rail, a slide rail platform, a dummy device, a motor and a computer control system;

the hook is arranged in the guide rail and moves left and right, the guide rail where the hook is arranged can move up and down, and the hook is suitable for installing range hoods in different forms and different models and can adjust the installation height according to the requirement;

the dummy device is arranged on the sliding rail platform, the computer control system transmits motion parameters including speed, acceleration and start-stop time to the motor, and the sliding rail platform is driven by the motor to drive the dummy device to move.

2. The device for testing escape amount of the range hood based on the PIV technology as claimed in claim 1, wherein the hook and the guide rail where the hook is located can be connected and fixed in an I-shaped connection manner.

3. The device for testing the escape amount of the range hood based on the PIV technology as claimed in claim 1, wherein the cooking bench is set to be single-eye electric heating and single-eye gas heating, and the fixed placement height is 800 mm.

4. A method for testing escape quantity of a range hood based on PIV technology according to the device of any one of claims 1-3, which is characterized by comprising the following steps:

1) the method comprises the following steps of installing a device for testing the escape volume of the range hood based on the PIV technology in a proper experimental kitchen, installing the range hood installation device and an interference device in the experimental kitchen, adopting transparent acrylic organic glass for an enclosure structure, installing a 2D-3C PIV particle image speed measurement system outside the experimental kitchen, connecting a laser system and a CCD camera by adopting guide rails, and adjusting and fixing the relative position according to a testing area;

2) filling the tracer particles into an experimental kitchen all the time, wherein the tracer particles can be diisooctyl sebacate (DEHS) or other tracer particles meeting the PIV test requirements; placing a stainless steel pot at the cooking bench, wherein the pot body is integrally blackened, and the pot does not need to be replaced in the same group of experiments; generating in the pot by adopting heat sources with different temperatures according to requirements, and installing a temperature controller to control the generated temperature;

3) debugging the interference device and the 2D-3C PIV particle image speed measurement system, and setting the shooting frequency and the shooting duration of the laser system 21 and the CCD camera to finish the preparation work;

4) observing the distribution condition of tracer particles in an experimental kitchen, turning on an electric heating or gas heating switch of the cooking bench to generate a heat source, and turning on a range hood to be tested; setting the speed, the acceleration and the start-stop time of the interference device, respectively considering the conditions of opening and closing the interference device, and respectively shooting from the front side and one side surface of the range hood by using a laser system and a CCD camera;

5) image data obtained by a CCD camera is transmitted to a computer acquisition system, flow fields on the front side and one side surface of the range hood are calculated by a computer program, a plurality of grids with equal areas are automatically divided from an image obtained at each moment, and when the escape flow of the range hood is calculated, attention is paid to the direction perpendicular to a test section and the direction is outward (the direction is defined as positive, and the direction is selected to be outward>0.1m/s), and the escape velocity of the section at the moment of shooting can be obtained by accumulative summation(m/s), the escape speed and the grid area are integrated to obtain the escape flow (m) at the moment³/s)。

Technical Field

The invention relates to a method for testing the escape quantity of a range hood, in particular to a device and a method for testing the escape quantity of the range hood based on a PIV technology.

Background

It is well known that cooking activities generate a large amount of pollutants, and that cooking activities are already the most important source of indoor pollutants. Pollutants generated by cooking comprise CO, formaldehyde, VOCs, SVOCs, PM10, PM2.5, UFPs and the like, and the human body is exposed in the kitchen environment for a long time, so that respiratory symptoms, lung cancer and other diseases are possibly induced. Because of the multiple exposure influence of cooking pollutant discharge on indoor air quality and human health, the focus of people's attention is always, and the lampblack absorber is a more effective oil smoke removing device.

In fact, the range hood has been widely used in a household kitchen, but the range hood leaving factory cannot make consumers well obtain the information of the effect of removing cooking pollutants, the Chinese standard GB/T17713-2011 makes provisions on the degree of odor reduction of the range hood and the testing method thereof, but on the one hand the pollutant emissions of the actual cooking activity can be approximated as a non-point source, with great differences from the way in which the method takes place, and on the other hand the method is based on the theory of total ventilation, therefore, the result of the test mode leads the odor to be reduced only in positive correlation with the air quantity of the range hood, and the increase of the air quantity at one step not only consumes serious energy, and the elimination of pollutants cannot be improved more, so how to adopt a more scientific and effective method to quantitatively evaluate the elimination effect of the range hood is the problem to be solved at present.

The invention overcomes the defects of the prior art, provides a testing device and a testing method based on a PIV technology and capable of quantitatively calculating escape quantities of different range hoods, and the method can be used for evaluating the pollutant discharge effect of the range hoods.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a testing device and a testing method which are based on a PIV technology and can quantitatively calculate the escape quantity of a range hood.

In order to achieve the purpose, the invention adopts the technical scheme that: a testing device for escape quantity of a range hood based on a PIV technology comprises a range hood mounting device, a set of 2D-3C PIV particle image speed measurement system and an interference device; the 2D-3C PIV particle image speed measurement system comprises a set of high-power laser system, two CCD cameras with high signal-to-noise ratio and a computer acquisition system; the range hood mounting device comprises a guide rail, a hook and an experimental cooking bench, wherein the hook is mounted in the guide rail and can move left and right, the guide rail where the hook is located can move up and down, and the range hood mounting device is suitable for mounting range hoods of different forms and different models and can adjust the mounting height according to requirements; the cooking bench is set to be single-hole electric heating and single-hole gas heating, and the fixed placement height is 800 mm; the interference device comprises a sliding rail, a sliding rail platform, a dummy device, a motor and a computer control system, wherein the dummy device is installed on the sliding rail platform, the computer control system transmits motion parameters including speed, acceleration and start-stop time to the motor, and the sliding rail platform is driven by the motor.

A method for testing escape quantity of a range hood based on a PIV technology comprises the following steps:

(1) the testing device for the escape quantity of the range hood based on the PIV technology is installed in a proper experiment kitchen, the range hood installation device and the interference device are installed in the experiment kitchen, a building enclosure is made of transparent acrylic organic glass, the 2D-3C PIV particle image speed measurement system is installed outside the experiment kitchen, the laser system and the CCD camera are connected through a guide rail, and the relative position is adjusted and fixed according to a testing area;

(2) filling the tracer particles into an experimental kitchen all the time, wherein the tracer particles can be diisooctyl sebacate (DEHS) or other tracer particles meeting the PIV test requirements; placing a stainless steel pot at the cooking bench, wherein the pot body is integrally blackened, and the pot does not need to be replaced in the same group of experiments; generating in a pot by adopting heat sources with different temperatures according to requirements, such as corn oil at 260 ℃, water at 100 ℃ and the like, and installing a temperature controller to control the generation temperature;

(3) debugging the interference device and the 2D-3C PIV particle image speed measurement system, and setting the shooting frequency and the shooting duration of the laser system 21 and the CCD camera to finish the preparation work;

(4) observing the distribution condition of tracer particles in an experimental kitchen, turning on an electric heating or gas heating switch of the cooking bench to generate a heat source, and turning on a range hood to be tested; setting the speed, the acceleration, the start-stop time and the like of the interference device, respectively considering the conditions of opening and closing the interference device, and respectively shooting from the front side and one side surface of the range hood by using a laser system and a CCD camera;

(5) image data obtained by a CCD camera is transmitted to a computer acquisition system, flow fields on the front side and one side surface of the range hood are calculated by a computer program, a plurality of grids with equal areas are automatically divided from an image obtained at each moment, and when the escape flow of the range hood is calculated, attention is paid to the direction perpendicular to a test section and the direction is outward (the direction is defined as positive, and the direction is selected to be outward>0.1m/s), the escape velocity (m/s) of the section at the shooting moment can be obtained by accumulative summation, and the escape velocity and the grid area are subjected to product to obtain the escape flow (m) at the moment³/s)。

Compared with the prior art, the invention has the following beneficial effects:

1. the invention provides a method capable of quantitatively describing escape of the side face of a range hood, and effectively solves the problem that the exhaust effect of the range hood is difficult to evaluate.

2. The invention can effectively observe the three-dimensional flowing state of the side surface of the range hood.

3. The interference device is additionally arranged, so that the interference conditions of each experiment are kept consistent, and the influence of the interference device on the escape of the side surface of the range hood can be quantitatively analyzed.

4. The method provided by the invention has strong operability and high reliability, and can provide reference for how to improve the trapping efficiency of the range hood in the next step.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, the drawings in the following description are only 1 embodiment of the present invention, and other drawings can be obtained according to the drawings without creative efforts for those skilled in the art.

FIG. 1 is a layout view-top view of a preferred embodiment of the present invention;

FIG. 2 is a schematic view of a range hood mounting arrangement of a preferred embodiment of the present invention;

FIG. 3 is a diagram illustrating an interference apparatus according to a preferred embodiment of the present invention;

FIG. 4 is a trellis diagram for escape computation according to the preferred embodiment of the present invention.

Detailed Description

The invention is described in detail below with reference to specific embodiments and drawings, and with reference to the apparatus and method for testing the escaping amount of a range hood based on the PIV technology.

The invention discloses a schematic layout diagram of a device for testing escape volume of a range hood based on PIV technology, which is shown in attached figure 1, and comprises a range hood installation device 1, a set of 2D-3C PIV particle image speed measurement system 2 and an interference device 3; the 2D-3C PIV particle image speed measurement system 2 comprises a set of high-power laser system 21, two CCD cameras 22 with high signal-to-noise ratio and a computer acquisition system 23; the schematic diagram of the range hood installation device shown in the attached figure 2 mainly comprises a plurality of groups of guide rails, a stainless steel plate is adopted for surrounding and blocking and is sprayed with black color so as to avoid reflection influence in the PIV shooting process, the range hood installation device further comprises a hook 11 and an experimental cooking bench 12, the hook 11 is installed in the guide rails 13 and can move left and right, the guide rails 13 where the hook is located can move up and down, the range hood installation device is suitable for installation of range hoods of different forms and different models, installation height can be adjusted according to needs, and the hook 11 and the guide rails 13 where the hook is located can be connected and fixed in a mode shown in the attached figure 2; the cooking bench 12 is set to be single-hole electric heating and single-hole gas heating, and the fixed placement height is 800 mm; the interference device shown in fig. 3 comprises a slide rail 31, a slide rail platform 32, a dummy device 33, a motor 34 and a computer control system 23, wherein the dummy device 33 is mounted on the slide rail platform 32, the computer control system 23 transmits motion parameters including speed, acceleration and start-stop time to the motor 34, and the slide rail platform 32 is driven by the motor 34 to drive the dummy device 33 to move.

The invention relates to a specific implementation mode of a method for testing the escape quantity of a range hood based on a PIV technology, which comprises the following steps of:

(1) the testing device for the escape quantity of the range hood based on the PIV technology is installed in a proper experiment kitchen, the range hood installation device 1 and the interference device 3 are installed in the experiment kitchen, an enclosure structure is made of transparent acrylic organic glass, the 2D-3C PIV particle image speed measurement system 2 is installed outside the experiment kitchen, the laser system 21 and the CCD camera 22 are connected through a guide rail, and the relative position is adjusted and fixed according to a testing area;

(2) filling the tracer particles into an experimental kitchen all the time, wherein the tracer particles can be diisooctyl sebacate (DEHS) or other tracer particles meeting the PIV test requirements; placing a stainless steel pot 121 with the diameter of 230mm and the depth of 120mm at the cooking bench 12, spraying black on the whole pot body, generating by adopting heat sources with different temperatures according to requirements, such as corn oil at 260 ℃, water at 100 ℃ and the like, and installing a temperature controller to control the generation temperature;

(3) debugging the interference device 3 and the 2D-3C PIV particle image speed measurement system 1, and setting the shooting frequency and the shooting duration of the laser system 21 and the CCD camera 22 to finish the preparation work;

(4) observing the distribution condition of tracer particles in an experimental kitchen, turning on an electric heating or gas heating switch of the cooking bench 12 to generate a heat source, and turning on the range hood 4 to be tested; setting the speed, the acceleration and the start-stop time of the interference device 3, respectively considering the conditions of opening and closing the interference device, and respectively shooting from the front side and one side surface of the range hood by using a laser system 21 and a CCD camera 22;

(5) the image data obtained by the CCD camera 22 is transmitted to the computer acquisition system 23, and the flow field of the front and side of the range hood is calculated by the computer program, and the image obtained at each moment is automatically divided into a plurality of grids with equal area, as shown in fig. 4, the shooting area and grid division condition of one experiment of the present invention, the specific size of the shooting area is 788.9387mm × 645.4953mm, the average division is 111 × 91 grids, and the area of each grid is about equal to 50mm². When calculating the escape flow of the range hood, paying attention to the direction perpendicular to the test section and outward (defined as positive, selecting>0.1m/s), the escape velocity (m/s) of the section at the shooting moment can be obtained by accumulative summation, and the escape velocity and the grid area are subjected to product to obtain the escape flow (m) at the moment³/s)。

The present invention is also intended to be limited to the above examples, and variations, modifications, additions, and substitutions that are within the spirit and scope of the invention may be made by those of ordinary skill in the art without departing from the spirit and scope of the invention as defined in the accompanying drawings.