Method and system for testing oil guiding and anti-accumulation performance of oil passage of smoke machine

Abstract

The application discloses a method and system for testing oil guiding and oil accumulation resistance performance of a range hood, and belongs to the technical field of kitchen appliance detection. The method comprises the following steps: obtaining initial data of a range hood to be tested; generating oil fume by using a target fume generating formula through a fume generating simulation device, and starting the range hood to be tested to perform cyclic multi-round testing; each time a target round of testing is completed, a data acquisition node is formed, a self-cleaning program of the range hood to be tested is started, and the range hood to be tested is stopped after cleaning for a third time length, and node data of the range hood to be tested is obtained; and a test result of the range hood to be tested is generated based on the initial data and the node data of the plurality of data acquisition nodes. According to the method, the running and intermittent working conditions of the range hood in a real use scene are simulated through the cyclic multi-round testing mode, the quantitative evaluation of the oil guiding performance and the oil accumulation resistance performance is realized by combining the initial data and the node data of the plurality of data acquisition nodes, and the accuracy and the horizontal comparability of the oil guiding and oil accumulation resistance performance testing of the oil circuit of the range hood are improved.

Description

Technical Field

[0001] This application belongs to the field of kitchen appliance testing technology, and in particular relates to a method and system for testing the oil guiding and anti-oil accumulation performance of a range hood. Background Technology

[0002] During the actual operation of a range hood, the liquid grease formed after the oil fumes are separated needs to be collected along a pre-set oil path to the oil collection device. If the oil path's oil guiding and anti-oil accumulation performance is insufficient, grease can easily accumulate inside the range hood, causing problems such as oil path blockage, poor oil guiding, and grease overflow, which in turn leads to a decrease in the smoke extraction effect. Therefore, during the research and development and production stages of a range hood, it is necessary to test the oil guiding and anti-oil accumulation performance of the range hood's oil path.

[0003] In related technologies, testing the oil guiding and anti-oil accumulation performance of range hood oil circuits mainly involves simulating oil fumes by burning vegetable oil, allowing the range hood to run continuously for a certain period, and then visually judging whether there is oil leakage or oil accumulation. However, this method is highly dependent on the experience of the testing personnel, and the results from different testing personnel and laboratories cannot be compared horizontally, resulting in significant fluctuations in the accuracy of the test data. Summary of the Invention

[0004] This application aims to address at least one of the technical problems existing in the prior art. To this end, this application proposes a method and system for testing the oil guiding and anti-oil accumulation performance of a range hood's oil circuit, thereby improving the accuracy and cross-comparison of the oil guiding and anti-oil accumulation performance tests.

[0005] In a first aspect, this application provides a method for testing the oil guiding and anti-oil accumulation performance of a range hood's oil path, including: Obtain the initial data of the range hood under test; the initial data includes the initial operating parameters of the range hood under test, the initial weight of the entire range hood under test, and the initial weight of the oil circuit components in the range hood under test; Using a target smoke-generating formula, oil fumes are generated through a smoke-generating simulation device, and the smoke machine under test is started for multiple rounds of cyclic testing. Each round of testing includes the smoke machine under test running in a simulated oil fume environment for a first duration, and then stopping for a second duration. Each completed test round is considered a data acquisition node. The self-cleaning program of the range hood under test is started, and the machine is stopped for three hours after cleaning. The node data of the range hood under test is then acquired. The node data includes the node operating parameters of the range hood under test, the node weight of the entire range hood under test, and the node weight of the oil circuit components. The test results of the smoke machine under test are generated based on the initial data and node data from multiple data acquisition nodes.

[0006] According to the oil guiding and anti-oil accumulation performance test method of the range hood oil circuit in this application, the operation and intermittent working conditions of the range hood in real use scenarios are simulated through multiple rounds of cyclic testing. Each round of testing includes alternating between a first duration of operation in a simulated oil fume environment and a second duration of shutdown, which better reflects the generation and dissipation patterns of oil fumes in actual use. After each target round of testing, data acquisition nodes are set. By starting the self-cleaning program and stopping the machine for a third period after cleaning, node data is acquired, further simulating the cleaning of the range hood by the self-cleaning function in actual use. Combining the initial data with the node data from multiple data acquisition nodes, a quantitative evaluation of the oil guiding and anti-oil accumulation performance is achieved, thereby reducing the interference of the tester's subjective experience on the test results and improving the accuracy and horizontal comparability of the oil guiding and anti-oil accumulation performance test of the range hood oil circuit.

[0007] According to one embodiment of this application, obtaining initial data of the smoke machine to be tested includes: Place the smoke machine under test in a preset constant temperature environment, remove the check valve at the exhaust end and start the smoke machine under test. Under the condition that the smoke machine under test is in a stable operating state, collect the initial operating parameters. The range hood under test was disassembled, and the initial weight of the entire range hood and the initial weight of the oil circuit components in the range hood were measured.

[0008] In this embodiment, by placing the smoke machine under test in a preset constant temperature environment, the interference of ambient temperature fluctuations on the operation of the smoke machine can be reduced. By removing the check valve, the influence of exhaust resistance on airflow parameters is reduced. By disassembling the smoke machine under test and measuring the initial weight of the whole machine and the initial weight of the oil circuit components, the changes in the weight of the whole machine and the weight of the oil circuit components during subsequent testing can reflect the oil accumulation and oil guiding conditions of the whole machine and the oil circuit, further improving the accuracy and comparability of the test results.

[0009] According to one embodiment of this application, the initial operating parameters include at least one of the following: operating power, motor speed, air inlet velocity, and air volume dynamic balance value; the oil circuit assembly includes a volute and / or a fan wheel.

[0010] According to one embodiment of this application, the smoke simulation device includes a heating device, a container, and a dripping device; the target smoke formulation includes a base liquid and a dripping medium; using the target smoke formulation, the smoke simulation device generates oil fumes, including: The base liquid in the container is heated using a heating device; When the temperature of the base liquid is greater than or equal to the target temperature, the dripping medium is added to the container using a dripping device.

[0011] In this embodiment, the base liquid in the container is heated by a heating device, and then a dripping medium is added by a dripping device when the base liquid temperature is greater than or equal to the target temperature. This utilizes the instantaneous heat conduction of the high-temperature base liquid to rapidly decompose and vaporize the dripping medium, simulating the composition and generation process of cooking fumes that are closer to actual cooking fumes, thus improving the accuracy of the fume environment simulation.

[0012] According to one embodiment of this application, the target smoke-generating formula includes a first formula for simulating everyday cooking conditions and a second formula for simulating heavy oil smoke conditions.

[0013] In this embodiment, by setting a first formula to simulate daily cooking conditions and a second formula to simulate heavy oil fume conditions, the test can correspond to the operating status of the range hood in regular home cooking and high-intensity stir-frying, deep-frying and other oil fume environments, respectively. The test results can also reflect the oil guiding and anti-oil accumulation performance of the range hood in different usage scenarios, further improving the accuracy of the test.

[0014] According to one embodiment of this application, the base liquid of the first formulation includes vegetable oil, and the dropper medium of the first formulation includes water; the base liquid of the second formulation includes animal oil, and the dropper medium of the second formulation includes a mixture of water, soy sauce, aged vinegar, dark soy sauce, salt and oyster sauce in a target ratio.

[0015] In this embodiment, by using vegetable oil as the base liquid and water as the dripping medium, the aerosol environment of oil decomposition due to heat and coexistence of water vapor in daily cooking is simulated. By using animal oil as the base liquid and a mixture of water, soy sauce, aged vinegar, dark soy sauce, salt and oyster sauce in a target ratio as the dripping medium, the composition of oil fumes under heavy oil fume conditions is simulated. This makes the simulated oil fumes closer to actual high-intensity cooking scenarios such as stir-frying and braising, and further improves the accuracy of oil fume simulation.

[0016] According to one embodiment of this application, generating test results for the smoke machine under test based on initial data and node data from multiple data acquisition nodes includes: Acquire the change index data of each data acquisition node relative to the initial data; the change index data includes at least one of the following: overall oil accumulation weight gain rate, oil accumulation weight gain rate of oil circuit components, wind speed attenuation rate, and power change rate. Based on the threshold range of the change index data corresponding to each data acquisition node, the test results, including the oil guiding and anti-oil accumulation performance level of the range hood under test, are determined.

[0017] In this embodiment, by using at least one of the following indicators—the overall oil accumulation weight gain rate, the oil accumulation weight gain rate of the oil circuit components, the wind speed attenuation rate, and the power change rate—the change index data corresponding to each data acquisition node are compared with a preset threshold range to determine the test results, including the oil circuit guiding and anti-oil accumulation performance levels. This reduces the judgment fluctuations caused by differences in the experience of different testers, achieves standardization of oil circuit guiding and anti-oil accumulation performance testing, and further improves the accuracy and horizontal comparability of the oil circuit guiding and anti-oil accumulation performance testing of the range hood.

[0018] According to one embodiment of this application, the method further includes: Before starting the self-cleaning program, obtain the weight of the entire range hood under test after the oil has accumulated; The self-cleaning rate of the range hood under test is obtained based on the weight of the entire range hood after oil accumulation, the weight of the nodes of the entire range hood under test, and the initial weight of the entire range hood under test.

[0019] In this embodiment, by obtaining the weight of the entire range hood under test after oil accumulation before starting the self-cleaning program, and combining the node weight after the self-cleaning process with the initial weight, the self-cleaning rate of the range hood under test is calculated, thereby improving the accuracy of the range hood self-cleaning ability assessment.

[0020] Secondly, this application provides a testing system for the oil guiding and anti-oil accumulation performance of a range hood, comprising: The smoke machine to be tested; A fume simulation device for generating fumes using a target fume-generating formula; A control device for performing the test method for the oil guiding and anti-oil accumulation performance of the oil circuit of the range hood as described in the first aspect above.

[0021] The oil guiding and anti-oil accumulation performance testing system for range hoods disclosed in this application simulates the operation and intermittent working conditions of a range hood in real-world usage scenarios through multiple rounds of cyclic testing. Each round of testing includes alternating periods of operation in a simulated oil fume environment and periods of inactivity, thus better reflecting the actual generation and dissipation patterns of oil fumes in use. After each target round of testing, data acquisition nodes are set up. By initiating a self-cleaning program and stopping the machine for a third period after cleaning, node data is acquired, further simulating the actual cleaning of the range hood through the self-cleaning function. Combining the initial data with node data from multiple data acquisition nodes, a quantitative evaluation of oil guiding and anti-oil accumulation performance is achieved, thereby reducing the interference of subjective experience of testing personnel on the test results and improving the accuracy and horizontal comparability of the oil guiding and anti-oil accumulation performance testing of the range hood's oil circuit.

[0022] According to one embodiment of this application, the fume simulation device includes a heating device, a container, and a dripping device, and the target fume-generating formula includes a base liquid and a dripping medium; Containers used to hold the base liquid; Heating equipment used to heat containers; A dripping device is used to add a dripping medium to a container when the temperature of the base liquid is greater than or equal to a target temperature.

[0023] Thirdly, this application provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the oil guiding and anti-oil accumulation performance test method for the range hood oil circuit as described in the first aspect above.

[0024] Fourthly, this application provides a non-transitory computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the method for testing the oil guiding and anti-oil accumulation performance of the range hood oil circuit as described in the first aspect above.

[0025] The above-described one or more technical solutions in the embodiments of this application have at least one of the following technical effects: According to the oil guiding and anti-oil accumulation performance test method of the range hood oil circuit in this application, the operation and intermittent working conditions of the range hood in real use scenarios are simulated through multiple rounds of cyclic testing. Each round of testing includes alternating between a first duration of operation in a simulated oil fume environment and a second duration of shutdown, which better reflects the generation and dissipation patterns of oil fumes in actual use. After each target round of testing, data acquisition nodes are set. By starting the self-cleaning program and stopping the machine for a third period after cleaning, node data is acquired, further simulating the cleaning of the range hood by the self-cleaning function in actual use. Combining the initial data with the node data from multiple data acquisition nodes, a quantitative evaluation of the oil guiding and anti-oil accumulation performance is achieved, thereby reducing the interference of the tester's subjective experience on the test results and improving the accuracy and horizontal comparability of the oil guiding and anti-oil accumulation performance test of the range hood oil circuit.

[0026] In some embodiments, by placing the smoke machine under test in a preset constant temperature environment, the interference of ambient temperature fluctuations on the operation of the smoke machine can be reduced. By removing the check valve, the influence of exhaust resistance on airflow parameters is reduced. By disassembling the smoke machine under test and measuring the initial weight of the whole machine and the initial weight of the oil circuit components, the changes in the weight of the whole machine and the weight of the oil circuit components during subsequent testing can reflect the oil accumulation and oil guiding conditions of the whole machine and the oil circuit, thereby further improving the accuracy and comparability of the test results.

[0027] In some embodiments, the base liquid in the container is heated by a heating device, and then a dripping medium is added by a dripping device when the base liquid temperature is greater than or equal to the target temperature. This utilizes the instantaneous heat conduction of the high-temperature base liquid to rapidly decompose and vaporize the dripping medium, simulating the composition and generation process of cooking fumes that are closer to actual cooking fumes, thereby improving the accuracy of the fume environment simulation.

[0028] In some embodiments, by setting a first formula for simulating daily cooking conditions and a second formula for simulating heavy oil fume conditions, the test can correspond to the operating status of the range hood in regular home cooking and high-intensity stir-frying, deep-frying and other oil fume environments, respectively. The test results can also reflect the oil guiding and anti-oil accumulation performance of the range hood in different usage scenarios, further improving the accuracy of the test.

[0029] In some embodiments, vegetable oil is used as the base liquid and water is used as the dripping medium to simulate the aerosol environment in daily cooking where oil decomposes under heat and water vapor coexists. Animal oil is used as the base liquid and a mixture of water, soy sauce, aged vinegar, dark soy sauce, salt and oyster sauce in a target ratio is used as the dripping medium to simulate the composition of oil fumes under heavy oil fume conditions. This makes the simulated oil fumes closer to the actual high-intensity cooking scenarios such as stir-frying and braising, and further improves the accuracy of oil fume simulation.

[0030] In some embodiments, by using at least one of the following indicators—the overall oil accumulation weight gain rate, the oil accumulation weight gain rate of the oil circuit components, the wind speed attenuation rate, and the power change rate—the change index data corresponding to each data acquisition node are compared with a preset threshold range to determine the test results, including the oil circuit guiding and anti-oil accumulation performance levels. This reduces the judgment fluctuations caused by differences in the experience of different testers, achieves standardization of the oil circuit guiding and anti-oil accumulation performance test, and further improves the accuracy and horizontal comparability of the oil circuit guiding and anti-oil accumulation performance test of the range hood.

[0031] In some embodiments, by obtaining the weight of the entire range hood under test after oil accumulation before starting the self-cleaning program, and combining the node weight after the self-cleaning process with the initial weight, the self-cleaning rate of the range hood under test is calculated, thereby improving the accuracy of the self-cleaning ability assessment of the range hood.

[0032] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0033] The above and / or additional aspects and advantages of this application will become apparent and readily understood in conjunction with the following description of the embodiments in conjunction with the accompanying drawings, wherein: Figure 1 This is a schematic flowchart of the method for testing the oil guiding and anti-oil accumulation performance of the range hood oil circuit according to an embodiment of this application; Figure 2 This is a schematic diagram illustrating a scenario example provided in the embodiments of this application; Figure 3 This is a schematic diagram of a test scenario provided in an embodiment of this application; Figure 4 This is a schematic diagram of the structure of the electronic device provided in the embodiments of this application. Detailed Implementation

[0034] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0035] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0036] A range hood, also known as a kitchen exhaust hood, is an essential piece of equipment in the kitchen used to remove cooking fumes and exhaust gases, keeping the kitchen air fresh. A range hood typically includes components such as a fan system, exhaust ducts, a control panel, air inlets, and air outlets.

[0037] The air inlet is where the range hood absorbs cooking fumes and exhaust gases. It is usually located at the bottom or side of the range hood, close to the stove, to capture the fumes generated during cooking. The air outlet is located at the top or rear of the range hood, and it exhausts the absorbed fumes and exhaust gases outdoors through the exhaust duct.

[0038] The fan system is the core power component of the range hood, consisting of a motor and a fan wheel. When the motor drives the fan wheel to rotate at high speed, a negative pressure area is formed inside the fan. The oil fumes are drawn into the machine through the air pressure difference and then discharged outdoors through the air outlet and exhaust pipe.

[0039] The control panel of the range hood is used to enable users to interact with the range hood. Users can control the range hood's on / off function, fan speed adjustment, lighting, and other functions through physical buttons or a touch interface on the control panel.

[0040] After the fumes enter the machine through the air inlet, they form an airflow under the action of the fan system. As the grease in the fumes flows through components such as the oil filter, volute, and impeller, it separates from the fumes due to collisions and centrifugal separation. Under the action of gravity, the separated grease flows and collects along the surfaces of the oil filter, the inner wall of the volute, and the oil guide plate, eventually flowing into the oil collection box located at the bottom of the range hood. These components through which the grease flows or collects form the oil passages inside the range hood.

[0041] However, if the oil circuit's oil guiding and anti-oil accumulation performance is insufficient, grease can easily accumulate inside the range hood, causing problems such as oil circuit blockage, poor oil guiding, and grease overflow, which in turn leads to a decrease in smoke extraction efficiency. Therefore, it is necessary to test the oil guiding and anti-oil accumulation performance of the range hood's oil circuit during the research and development and production stages.

[0042] Based on this, this application provides a method and system for testing the oil guiding and anti-oil accumulation performance of a range hood's oil circuit. The following, in conjunction with the accompanying drawings, provides a detailed description of the method and system for testing the oil guiding and anti-oil accumulation performance of a range hood's oil circuit through specific embodiments and application scenarios.

[0043] like Figure 1 As shown, the method for testing the oil guiding and anti-oil accumulation performance of the range hood in this application includes steps 110, 120, 130 and 140.

[0044] Step 110: Obtain the initial data of the range hood under test; the initial data includes the initial operating parameters of the range hood under test, the initial weight of the entire range hood under test, and the initial weight of the oil circuit components in the range hood under test.

[0045] In this embodiment of the application, the initial data is the basic data for benchmark measurement of the smoke machine under test before the test begins, including the initial operating parameters of the smoke machine under test, the initial weight of the entire smoke machine under test, and the initial weight of the oil circuit components in the smoke machine under test.

[0046] Initial operating parameters are parameters that reflect the operating status of the range hood under test before the test begins. They can characterize the normal working status of the range hood when it is not in contact with simulated oil fumes. These parameters include at least one of the following: operating power, motor speed, inlet air velocity, air volume dynamic balance value, operating current, duct air pressure, and start / stop response parameters.

[0047] In some embodiments, the smoke machine under test can be placed in a standard test environment with constant temperature and humidity for a preset time, and then the smoke machine under test can be started to run under no-load. The initial operating parameters under stable conditions can be collected and recorded by measuring equipment such as power analyzer, photoelectric tachometer, and multi-point anemometer.

[0048] The initial weight of the range hood under test refers to the weight value obtained by weighing the entire range hood before the test begins. It represents the total mass of the range hood in a clean state, including the sum of the masses of all components such as the outer casing, internal oil circuit components, fan system, and control system. During the test, as the grease separated from the fumes condenses and accumulates on the surfaces of various components inside the range hood, the overall weight will increase. Therefore, the change in the overall weight can be used to indirectly assess the degree of grease accumulation on the range hood as a whole.

[0049] The initial weight of the oil circuit components refers to the weight value obtained by individually weighing the components related to grease flow inside the range hood before the start of the test. The oil circuit components can include parts through which grease flows and collects, such as grease guide plates, grease collection troughs, grease cups, filters, volutes, and impellers. Changes in the weight of the oil circuit components directly reflect the accumulation of grease in the oil circuit.

[0050] In some embodiments, a high-precision electronic balance can be used to weigh the entire range hood and its oil circuit components. The weighing accuracy can be set according to the test requirements, for example, to 0.01g or higher. Before weighing, the entire range hood and its oil circuit components should be kept clean and dry to reduce interference from moisture or other impurities on the weight measurement.

[0051] In some embodiments, the initial weight of the oil circuit component can be determined by disassembling the range hood under test and weighing the oil circuit component separately.

[0052] Step 120: Using the target smoke-generating formula, generate oil fumes through a smoke-generating simulation device, and start the smoke machine under test for multiple rounds of cyclic testing; wherein, one round of testing includes the smoke machine under test running in the simulated oil fume environment for a first time and then stopping for a second time.

[0053] In some embodiments, the range hood under test needs to be correctly installed before testing. For example, it can be installed according to the minimum installation height specified in the instruction manual of the range hood under test. For example, if the instruction manual specifies a minimum installation height of 690mm, it can be fixedly installed at an installation height of 690mm. This ensures that the air intake and exhaust performance of the range hood under test is tested under the boundary conditions required by the design, thereby fully verifying the oil guiding and anti-oil accumulation performance of the range hood under test under the most unfavorable installation conditions.

[0054] In practical applications, due to factors such as multiple households simultaneously venting smoke in a shared flue, flue structure design, and differences in floor height, range hoods typically need to overcome a certain back pressure to function properly. Therefore, a pressure regulating device can be installed in the exhaust duct to maintain a constant back pressure during testing. The back pressure is the resistance that the range hood needs to overcome during smoke extraction. For example, maintaining a constant back pressure of 200 Pa can simulate the resistance conditions faced by the range hood when used in a shared flue in a high-rise residential building. By controlling the back pressure through a pressure regulating device, different range hoods under test can be tested under the same resistance conditions, reducing test result deviations caused by differences in exhaust resistance and improving the comparability of the tests.

[0055] In some embodiments, the pressure regulating device may be a device that can adjust the pipeline resistance, such as a throttle valve or a variable frequency fan, and monitor the back pressure value in the flue gas pipeline through a pressure sensor, and adjust the pressure regulating device accordingly to maintain a constant back pressure.

[0056] In this embodiment of the application, the cyclical testing can simulate the periodic operation and intermittent working conditions of the range hood in real-world usage scenarios, making the testing process more consistent with the patterns of oil fume generation and dissipation in actual cooking habits.

[0057] A target smoke-generating formula refers to the material ratio scheme used to generate simulated cooking fumes. A smoke simulation device can simulate a cooking fume environment by heating the target smoke-generating formula to produce aerosols with similar physicochemical properties to real cooking fumes.

[0058] The target smoke-generating formula can be configured according to testing requirements. For example, the target smoke-generating formula can be a mixture of vegetable oil and water, and the amount of smoke generated under different cooking intensities can be simulated by controlling the heating temperature and drip rate.

[0059] The smoke simulation device may include components such as a heating furnace, a frying pan, and a dripping device. During the test, the frying pan can be placed below the range hood under the test, so that the simulated fumes can rise naturally and directly enter the range hood's suction and exhaust area, simulating the process of fumes being generated above the cookware and sucked into the range hood during real cooking.

[0060] The heating furnace is used to heat the test oil in the oil pan to the temperature required to produce oil fumes; the dripping device is used to add distilled water to the oil pan at a target rate, and a large amount of oil fumes are generated through the contact between the water and the high-temperature oil.

[0061] In some embodiments, the oil temperature can be controlled within the range of 260℃±5℃, and the dripping rate is about one drop per second, with each drop being about 1 / 20mL, in order to simulate the generation of oil fumes during real cooking to the greatest extent.

[0062] The test consists of two phases: a first phase of continuous operation of the range hood in a simulated cooking fume environment, followed by a second phase of inactivity. The first phase represents the continuous operation of the range hood in the simulated environment, simulating its fume extraction during cooking. The second phase represents the intermittent period when the range hood stops operating, simulating the gradual dissipation of fumes after cooking. This alternating cycle of the first and second phases more realistically reflects the repeated start-stop cycles and the intermittent generation and accumulation of fumes during actual use, thus improving the accuracy of the test results.

[0063] In some embodiments, the first duration can be determined based on the duration of a single cooking session. For example, in actual cooking, the duration of a single cooking session is approximately 1 hour, so the first duration can be set to 1 hour. The second duration can be determined based on the time for grease deposition and cooling in the fumes. For example, the second duration can be set to 1 hour, meaning that each round of testing includes the continuous generation of fumes by the fume-generating simulation device. After the tested fume hood runs in the simulated fume environment for 1 hour, it stops generating fumes and controls the tested fume hood to stop running for 1 hour.

[0064] Of course, the specific values ​​of the first duration and the second duration can be adjusted according to actual testing needs, and this application embodiment does not limit this.

[0065] The total number of rounds of cyclic testing can be set according to the testing purpose, such as conducting 7, 14, 20, 40 or more rounds of testing to evaluate the oil guiding and anti-oil accumulation performance of the range hood under different usage cycles.

[0066] Through multiple rounds of cyclical testing, the oil circuit inside the range hood undergoes repeated condensation, diversion, and accumulation of grease during repeated operation and intermittent cycles. This fully exposes the deficiencies in the oil circuit design regarding oil diversion smoothness and anti-grease accumulation capabilities during long-term operation.

[0067] Step 130: Each completed test round is considered a data acquisition node. Start the self-cleaning program of the range hood under test and stop the machine for three hours after cleaning. Acquire the node data of the range hood under test. The node data includes the node operating parameters of the range hood under test, the node weight of the entire range hood under test, and the node weight of the oil circuit components.

[0068] In this embodiment of the application, the data acquisition node is a node set at the target round interval during the test process, which is used to acquire relevant data of the range hood at different stages of the test, so as to determine the trend of the oil guiding performance and anti-oil accumulation performance of the range hood under test as a function of usage time.

[0069] The target number of rounds can be set according to actual needs. For example, every 5 rounds of testing can be set as a data collection node, or every 10 rounds of testing can be set as a data collection node.

[0070] The self-cleaning program is an automatic cleaning function built into the range hood under test. It can include methods such as hot melt cleaning, high-pressure spraying, and centrifugal oil removal to remove grease accumulated inside the range hood under test.

[0071] After completing the target round of testing, the self-cleaning program of the tested range hood is activated to simulate the user's regular cleaning and maintenance operations in actual use.

[0072] After the self-cleaning process is completed, the machine will be shut down for a third period of time. This third period refers to the duration the tested range hood remains off after self-cleaning to allow any residual cleaning liquid (such as water stains from spray cleaning) to evaporate fully and for the internal temperature to return to room temperature. This third period can be set according to the self-cleaning method, ambient temperature and humidity, for example, to 12 hours, 24 hours, 36 hours, 48 ​​hours, or other durations.

[0073] After the third time interval, node data for the tested range hood is acquired. Node data includes node operating parameters, the node weight of the entire range hood, and the node weight of the oil circuit components. Node operating parameters are the operating status parameters of the range hood at the data acquisition node. The types of node operating parameters are the same as the initial operating parameters, including at least one of the following: operating power, motor speed, inlet air velocity, airflow dynamic balance value, operating current, duct air pressure, and start / stop response parameters.

[0074] In some embodiments, the node data is acquired in the same way as the initial data, that is, by using a high-precision electronic balance of the same accuracy for weighing and by using the same measuring equipment to collect node operating parameters.

[0075] Step 140: Generate the test results of the smoke machine under test based on the initial data and the node data of multiple data acquisition nodes.

[0076] In this embodiment, the oil guiding performance and anti-oil accumulation performance mainly evaluate the efficiency of oil flow and the ability to resist oil accumulation within the oil path of the range hood. Test results can be determined by comparing different change indicators of initial data and node data from multiple data acquisition nodes.

[0077] For example, by comparing the weight of the oil circuit component nodes at each data acquisition node with the initial weight of the oil circuit component, the amount of oil accumulated in the oil circuit component at each data acquisition node can be calculated. If the amount of oil accumulated in the oil circuit component increases rapidly with the increase of test rounds, it indicates that the grease is not well guided in the oil circuit, has poor resistance to grease, and grease easily accumulates on the surface of the oil circuit component. If the amount of oil accumulated in the oil circuit component increases slowly or tends to stabilize, it indicates that the grease is well guided in the oil circuit and has high resistance to grease. Alternatively, an oil accumulation threshold can be preset. If the amount of oil accumulated at any data acquisition node is greater than the oil accumulation threshold, it can be considered that the oil guiding performance and oil accumulation resistance performance are poor.

[0078] In some embodiments, test results can be presented in the form of quantitative indicators, such as change index data values. The change index data value can be defined as: (initial data - node data) / initial data × 100%, with lower values ​​indicating better oil guiding performance and anti-oil accumulation performance. Alternatively, multiple value ranges can be set, and the test results can be divided into excellent, good, qualified, and unqualified levels based on the range of the change index data value.

[0079] In some embodiments, the test results may also include a performance degradation curve to characterize the changing trends of oil guiding performance and anti-oil accumulation performance. The horizontal axis of the performance degradation curve may be the test round, and the vertical axis may be the value of the changing index data.

[0080] According to the oil guiding and anti-oil accumulation performance test method of the range hood oil circuit in this application, the operation and intermittent working conditions of the range hood in real use scenarios are simulated through multiple rounds of cyclic testing. Each round of testing includes alternating between a first duration of operation in a simulated oil fume environment and a second duration of shutdown, which better reflects the generation and dissipation patterns of oil fumes in actual use. After each target round of testing, data acquisition nodes are set. By starting the self-cleaning program and stopping the machine for a third period after cleaning, node data is acquired, further simulating the cleaning of the range hood by the self-cleaning function in actual use. Combining the initial data with the node data from multiple data acquisition nodes, a quantitative evaluation of the oil guiding and anti-oil accumulation performance is achieved, thereby reducing the interference of the tester's subjective experience on the test results and improving the accuracy and horizontal comparability of the oil guiding and anti-oil accumulation performance test of the range hood oil circuit.

[0081] In some embodiments, obtaining initial data of the smoke machine under test includes: Place the smoke machine under test in a preset constant temperature environment, remove the check valve at the exhaust end and start the smoke machine under test. Under the condition that the smoke machine under test is in a stable operating state, collect the initial operating parameters. The range hood under test was disassembled, and the initial weight of the entire range hood and the initial weight of the oil circuit components in the range hood were measured.

[0082] In this embodiment, the preset constant temperature environment is a test environment where the temperature is kept constant, and the temperature value can be set according to the test standard. It should be noted that the preset constant temperature environment does not mean that the temperature is kept absolutely constant. In actual scenarios, the temperature of the preset constant temperature environment will fluctuate. For example, the temperature value of the preset constant temperature environment can be set to 25℃±5℃.

[0083] A check valve is a one-way valve installed at the outlet of the exhaust pipe of a range hood to prevent backflow of fumes into the common flue. The opening and closing state of the check valve changes with variations in the exhaust back pressure, thus affecting the actual exhaust performance of the range hood. Since a constant exhaust back pressure needs to be controlled via a pressure regulating device during subsequent testing, the presence of a check valve could introduce additional resistance variables due to its opening and closing, interfering with back pressure control. Therefore, the exhaust check valve needs to be removed before collecting initial operating parameters.

[0084] After removing the check valve, start the range hood under test and wait until it reaches a stable operating state before collecting initial operating parameters. A stable operating state means that parameters such as the range hood's motor speed, operating current, and power remain constant at the set fan speed without significant fluctuations. For example, the range hood under test will reach a stable operating state 2-5 minutes after startup; therefore, initial operating parameters can be collected 2-5 minutes after starting the range hood.

[0085] In some embodiments, the range hood to be tested can be disassembled before or after the initial operating parameters are collected, and the entire range hood (i.e., the complete body containing all components) can be weighed to obtain the initial weight of the entire machine. The oil circuit component can be removed from the entire machine and weighed separately to obtain the initial weight of the oil circuit component.

[0086] In this embodiment, by placing the smoke machine under test in a preset constant temperature environment, the interference of ambient temperature fluctuations on the operation of the smoke machine can be reduced. By removing the check valve, the influence of exhaust resistance on airflow parameters is reduced. By disassembling the smoke machine under test and measuring the initial weight of the whole machine and the initial weight of the oil circuit components, the changes in the weight of the whole machine and the weight of the oil circuit components during subsequent testing can reflect the oil accumulation and oil guiding conditions of the whole machine and the oil circuit, further improving the accuracy and comparability of the test results.

[0087] In some embodiments, the smoke simulation device includes a heating device, a container, and a dripping device; the target smoke formulation includes a base liquid and a dripping medium; using the target smoke formulation, generating oil fumes through the smoke simulation device includes: The base liquid in the container is heated using a heating device; When the temperature of the base liquid is greater than or equal to the target temperature, the dripping medium is added to the container using a dripping device.

[0088] In this embodiment, the smoke simulation device may include a heating device, a container, and a dripping device. The container is used to hold the base liquid and may be a heat-resistant metal cookware or ceramic ware.

[0089] Heating equipment is used to heat the base liquid in a container to bring it to the temperature required to produce oil fumes. Heating equipment can be a gas stove, induction cooker, etc.

[0090] A dripping device is used to add a dripping medium to a container at a set rate after the base liquid reaches a target temperature. The contact between the dripping medium and the high-temperature base liquid generates a large amount of oily fumes. The dripping device may include a storage container, a flow control unit, and a delivery pipeline. The storage container holds the pre-prepared dripping medium, and the flow control unit regulates the output flow rate of the dripping medium. The flow control unit can be a peristaltic pump, a syringe pump, etc. The delivery pipeline connects the storage container and the flow control unit and is used to deliver the dripping medium. The outlet end of the delivery pipeline is located above the container and is used to drip the dripping medium into the high-temperature base liquid. Of course, the dripping device can also be of other structures, and this application embodiment does not limit this.

[0091] The base liquid is the basic material for generating oil fumes, used to simulate the composition and characteristics of oil fumes. For example, the base liquid can be vegetable oil, such as peanut oil, rapeseed oil, corn oil, soybean oil, etc., or animal oil, such as lard, tallow, etc., or a mixture of vegetable oil and animal oil, etc.

[0092] A dripping medium is a liquid that, when added to a high-temperature base liquid, triggers a violent vaporization reaction, thereby producing a large amount of oily fumes. Examples include water, or a mixture of common condiments such as soy sauce, vinegar, dark soy sauce, salt, and oyster sauce with water.

[0093] In some embodiments, different target smoke formulations may be used depending on the needs of the test. For example, the target smoke formulation may include a first formulation for simulating everyday cooking conditions and a second formulation for simulating heavy oil fume conditions.

[0094] In this embodiment, by setting a first formula to simulate daily cooking conditions and a second formula to simulate heavy oil fume conditions, the test can correspond to the operating status of the range hood in regular home cooking and high-intensity stir-frying, deep-frying and other oil fume environments, respectively. The test results can also reflect the oil guiding and anti-oil accumulation performance of the range hood in different usage scenarios, further improving the accuracy of the test.

[0095] In some embodiments, the first formulation is used to simulate everyday cooking conditions, and the base liquid includes vegetable oils, such as rapeseed oil, peanut oil, soybean oil, etc.

[0096] It should be noted that vegetable oil is the most commonly used type of oil in daily household cooking. The smoke point, viscosity, fatty acid composition and other properties of vegetable oil are highly consistent with the oil fumes produced in daily cooking. Therefore, using vegetable oil as the base liquid of the first formula can make the simulated oil fumes more realistically reflect the characteristics of oil fumes that the range hood comes into contact with in daily cooking scenarios.

[0097] The first formula uses water as the drip medium. When the water comes into contact with the hot vegetable oil, it vaporizes rapidly, producing a large amount of water vapor and oil fumes mixed aerosol, simulating the process of water evaporation and oil fumes rising when ingredients are put into the pan during daily cooking.

[0098] The second formula is used to simulate heavy oil fume conditions, and the base liquid includes animal oils, such as lard and tallow.

[0099] It should be noted that animal fats have a higher content of saturated fatty acids and more complex volatile components than vegetable oils. When heated at high temperatures, they produce more oil fumes, have a more complex composition, and higher viscosity, making them more likely to form stubborn oil buildup inside the range hood. Therefore, using animal fat as the base liquid in the second formula can simulate heavy oil fume conditions such as stir-frying and deep-frying during cooking, thus more thoroughly testing the oil guiding performance and anti-oil buildup ability of the range hood's oil circuit under extreme usage conditions.

[0100] The second formula uses a liquid mixture of water, soy sauce, aged vinegar, dark soy sauce, salt, and oyster sauce in the target proportions. This mixture simulates the complex chemical changes that occur in seasonings at high temperatures, such as Maillard reactions and caramelization, producing various volatile organic compounds such as aldehydes, ketones, and furans. This makes the simulated cooking fumes more complex in composition and more intense in aroma, more closely resembling the characteristics of cooking fumes from heavy oil cooking scenarios such as stir-frying and braising.

[0101] The target ratio can be set according to the test requirements. For example, for 150g of lard in a container, the drip medium is 150mL water + 20mL soy sauce + 20mL aged vinegar + 20mL dark soy sauce + 20g salt + 20mL oyster sauce.

[0102] In this embodiment, by using vegetable oil as the base liquid and water as the dripping medium, the aerosol environment of oil decomposition due to heat and coexistence of water vapor in daily cooking is simulated. By using animal oil as the base liquid and a mixture of water, soy sauce, aged vinegar, dark soy sauce, salt and oyster sauce in a target ratio as the dripping medium, the composition of oil fumes under heavy oil fume conditions is simulated. This makes the simulated oil fumes closer to actual high-intensity cooking scenarios such as stir-frying and braising, and further improves the accuracy of oil fume simulation.

[0103] In this embodiment, after the temperature of the base liquid reaches or exceeds the target temperature, the dripping device is activated to add the dripping medium to the container. The target temperature is a temperature threshold that allows the base liquid to generate sufficient oil fumes, and is higher than the smoke point of the base liquid. For example, the target temperature can be set to 280℃±5℃, thereby enabling vegetable oils and animal oils to reach a state of vigorous volatilization and decomposition, thus generating a large amount of simulated oil fumes. Of course, the specific value of the target temperature can be adjusted according to the type of base liquid and the testing requirements, and this embodiment does not limit this.

[0104] In this embodiment, the base liquid in the container is heated by a heating device, and then a dripping medium is added by a dripping device when the base liquid temperature is greater than or equal to the target temperature. This utilizes the instantaneous heat conduction of the high-temperature base liquid to rapidly decompose and vaporize the dripping medium, simulating the composition and generation process of cooking fumes that are closer to actual cooking fumes, thus improving the accuracy of the fume environment simulation.

[0105] In some embodiments, the test results of the smoke machine under test are generated based on initial data and node data from multiple data acquisition nodes, including: Acquire the change index data of each data acquisition node relative to the initial data; the change index data includes at least one of the following: overall oil accumulation weight gain rate, oil accumulation weight gain rate of oil circuit components, wind speed attenuation rate, and power change rate. Based on the threshold range of the change index data corresponding to each data acquisition node, the test results, including the oil guiding and anti-oil accumulation performance level of the range hood under test, are determined.

[0106] In this embodiment, the change index data are calculation indicators used to quantitatively evaluate the oil guiding performance and anti-oil accumulation performance of the range hood's oil circuit, including at least one of the following: overall oil accumulation weight gain rate, oil circuit component oil accumulation weight gain rate, wind speed attenuation rate, and power change rate.

[0107] The overall oil accumulation weight gain rate characterizes the degree of oil accumulation in the tested range hood during the test, and the calculation formula is: η1=(Wn W0) / W0×100% Where η1 represents the overall oil accumulation weight gain rate, Wn represents the node weight of the entire range hood under test, and W0 represents the initial weight of the entire range hood under test.

[0108] The oil accumulation weight gain rate of the oil circuit components characterizes the degree of grease accumulation in the internal oil circuit components of the range hood under test, and its calculation formula is as follows: η2=(Wm W1) / W1×100% Where η2 represents the oil accumulation weight gain rate of the oil circuit component, Wm represents the node weight of the oil circuit component, and W1 represents the initial weight of the oil circuit component.

[0109] Wind speed attenuation rate is an indicator reflecting the degree to which the exhaust performance of a range hood decreases due to grease buildup. The calculation formula is: δV=(V0 Vn) / V0×100% Where δV represents the wind speed attenuation rate, V0 represents the initial inlet wind speed in the initial operating parameters, and Vn represents the node inlet wind speed in the node operating parameters.

[0110] The power change rate is an indicator reflecting the change in the energy consumption of a range hood due to oil accumulation. The calculation formula is: δP=(Pn P0) / P0×100% Where δP represents the power change rate, P0 represents the initial power in the initial operating parameters, and Pn represents the node power in the node operating parameters.

[0111] In some embodiments, the above-mentioned change index data can be used alone or in combination. For example, only the overall oil accumulation weight gain rate can be used to evaluate and generate test results, or multiple indicators can be used for comprehensive evaluation to generate test results. This application embodiment does not limit this approach.

[0112] After acquiring the change index data from each data collection node, the oil guiding and anti-oil accumulation performance of the tested range hood is graded according to the threshold range of each index, generating the final test results. For example, each change index data may correspond to the same or different threshold ranges, and the threshold range may include multiple ranges. For instance, the overall oil accumulation weight gain rate corresponds to three ranges: less than or equal to 1.5%, 1.5%-3%, and greater than 3%, while the impeller oil accumulation weight gain rate corresponds to three ranges: less than or equal to 3%, 3%-6%, and greater than 6%, etc.

[0113] In some embodiments, test results can be divided into multiple levels, such as excellent, qualified, and unqualified. The specific level can be determined based on the combination of threshold ranges of the changing indicator data.

[0114] For example, the criteria for an excellent rating are: overall oil accumulation weight gain rate ≤ 1.5%, impeller oil accumulation weight gain rate ≤ 3%, wind speed attenuation rate ≤ 5%, and power change rate within ±3%. A range hood achieving an excellent rating indicates that its oil circuit design performs well in guiding and preventing oil accumulation, with minimal grease buildup on the entire unit and impeller, and that the range hood maintains near-initial ventilation performance and energy consumption levels even after long-term operation.

[0115] The criteria for determining the pass / fail level are as follows: the overall oil accumulation weight gain rate is within the range of 1.5% to 3%, the oil accumulation weight gain rate of the impeller is within the range of 3% to 6%, the wind speed attenuation rate is within the range of 5% to 10%, and the power change rate is within ±6%. A range hood that meets the pass / fail level indicates that its oil circuit design can meet basic usage requirements, and that grease accumulation and performance degradation are within acceptable limits.

[0116] The criteria for determining a non-compliant grade are: overall oil accumulation weight gain rate > 3%, or impeller oil accumulation weight gain rate > 6%, or wind speed reduction rate > 10%. Meeting any of these conditions constitutes a non-compliant grade. A non-compliant range hood indicates a significant problem with the oil circuit design, such as poor oil drainage or insufficient oil accumulation resistance. Grease accumulates severely on the entire machine or impeller components, leading to a significant decrease in exhaust performance. In actual use, this may result in problems such as oil circuit blockage, poor oil drainage, and grease overflow.

[0117] In some embodiments, the level corresponding to each data acquisition node can be determined. If the level corresponding to any data acquisition node is unqualified, the final test result can be determined as unqualified. When the level corresponding to any data acquisition node is unqualified, the test can be stopped and the result can be directly judged as unqualified.

[0118] In this embodiment, by using at least one of the following indicators—the overall oil accumulation weight gain rate, the oil accumulation weight gain rate of the oil circuit components, the wind speed attenuation rate, and the power change rate—the change index data corresponding to each data acquisition node are compared with a preset threshold range to determine the test results, including the oil circuit guiding and anti-oil accumulation performance levels. This reduces the judgment fluctuations caused by differences in the experience of different testers, achieves standardization of oil circuit guiding and anti-oil accumulation performance testing, and further improves the accuracy and horizontal comparability of the oil circuit guiding and anti-oil accumulation performance testing of the range hood.

[0119] In some embodiments, the method further includes: Before starting the self-cleaning program, obtain the weight of the entire range hood under test after the oil has accumulated; The self-cleaning rate of the range hood under test is obtained based on the weight of the entire range hood after oil accumulation, the weight of the nodes of the entire range hood under test, and the initial weight of the entire range hood under test.

[0120] In this embodiment, the weight after oil accumulation is the weight value obtained by weighing the entire smoke machine to be tested after completing the target cycle test and before starting the self-cleaning program.

[0121] After obtaining the weight of the accumulated grease, the self-cleaning program is initiated. Then, the weight of each node of the entire range hood under test is obtained. Combined with the initial weight of the entire range hood, the self-cleaning rate is calculated. The self-cleaning rate characterizes the efficiency of the range hood's self-cleaning function in removing internally accumulated grease. The calculation formula is as follows: Q=(Wn mn) / (Wn W0)×100% Where Q represents the self-cleaning efficiency, Wn represents the node weight of the entire range hood under test, mn represents the weight of the entire range hood under test after oil accumulation, and W0 represents the initial weight of the entire range hood under test.

[0122] In some embodiments, by comparing the self-cleaning rate at different data acquisition nodes, the trend of self-cleaning performance changing with usage time can be analyzed. For example, if the self-cleaning rate shows a gradual decreasing trend with the increase of test rounds, it indicates that the adhesion of grease inside the range hood is stronger as the grease accumulation time increases, and the cleaning effect of the self-cleaning function gradually diminishes.

[0123] In some embodiments, the self-cleaning rate can be used as a supplement to the test results to more comprehensively evaluate the oil guiding performance and anti-oil accumulation performance of the range hood's oil circuit.

[0124] In this embodiment, by obtaining the weight of the entire range hood under test after oil accumulation before starting the self-cleaning program, and combining the node weight after the self-cleaning process with the initial weight, the self-cleaning rate of the range hood under test is calculated, thereby improving the accuracy of the range hood self-cleaning ability assessment.

[0125] The following scenario example illustrates the implementation process of the oil guiding and anti-oil accumulation performance testing method for the range hood oil circuit according to this application embodiment.

[0126] Testing equipment: high-precision electronic balance (0.01g precision electronic balance is leveled and calibrated before each weighing), power analyzer, photoelectric tachometer, multi-point anemometer, closed-loop back pressure regulating device, smoke generation simulation device (including dual-station stove, cookware, and dripping device); Test media: peanut oil, lard, water, soy sauce, aged vinegar, dark soy sauce, salt, and oyster sauce.

[0127] The range hoods to be tested are: Range hood A, Range hood B, Range hood C, and Range hood D.

[0128] In this scenario example, such as Figure 2 As shown, it includes steps S210-S206.

[0129] S210: Preprocessing and initial benchmark acquisition.

[0130] First, place the smoke machine under test in an environment of 25℃±5℃ and let it stand still. Remove the check valve and run it at high speed until it is stable. Collect the initial power, motor speed, air velocity at multiple points in the air inlet, and air volume dynamic balance value. Disassemble the whole machine, volute, and impeller and record the initial weight W0 of the whole machine, the initial weight of the volute and the impeller respectively. Take photos for archiving and then restore the smoke machine under test.

[0131] S220: Standardized installation.

[0132] like Figure 3 As shown, the range hood 301 to be tested is fixed at the minimum installation height of 690mm according to the instruction manual. A pressure regulating device is installed in the exhaust pipe to maintain a constant exhaust back pressure of 200Pa throughout the process. A dual-station stove 302 and a pot 303 are arranged below the range hood to be tested. The dripping device 304 can be set on both sides of the range hood 301 to be tested.

[0133] S230: Oil fume circulation and smoke generation test.

[0134] The target smoke-generating formula was used to generate fumes. A single test consisted of the range hood under test running in a continuous smoke-generating environment for 1 hour and then stopping for 1 hour, for a total of 20 cycles. Throughout the test, the range hood under test was kept at a high speed, and the temperature in the cookware was 260℃±5℃.

[0135] The target smoke-generating formula may include: Recipe A (simulating daily cooking conditions): Add 150mL of peanut oil to each of the two pots, and use 150mL of water as the drip medium.

[0136] Formula B (simulating heavy oil fume conditions): Add 150g of lard to each of the two pots. The drip medium is 150mL water + 20mL soy sauce + 20mL aged vinegar + 20mL dark soy sauce + 20g salt + 20mL oyster sauce.

[0137] S240: Data Acquisition.

[0138] Every 10 rounds of cyclic testing constitute a data acquisition node. The automatic cleaning function of the range hood under test is activated. After cleaning, the entire machine is left to stand for 48 hours. Then, the entire machine, impeller, and volute are weighed again. After restoration, the machine is powered on, and the current high-power setting, speed, inlet air velocity, and airflow dynamic balance value are collected. Among them, the airflow dynamic balance value is the dynamic balance offset of the impeller after oil accumulation. It is used to evaluate the operational eccentricity and abnormal vibration caused by oil accumulation in the impeller. The larger the value, the worse the operational stability, and it can be used as an auxiliary evaluation indicator.

[0139] S250: Indicator Calculation.

[0140] Calculate the change index data of each data acquisition node relative to the initial data, such as the overall oil accumulation weight gain rate, the oil accumulation weight gain rate of oil circuit components, the wind speed attenuation rate, and the power change rate.

[0141] S260: Overall Evaluation.

[0142] Based on the changing index data, the oil guiding and anti-oil accumulation performance level of the range hood under test is determined.

[0143] In this scenario example, the initial data and node data of each smoke machine under test are shown in the table below.

[0144]

[0145] Taking 20 rounds of data as an example, the change index data of each tested smoke machine are as follows.

[0146] Range Hood A: Overall oil accumulation weight gain rate = (31.65 - 31.35) / 31.35 × 100% ≈ 0.96%; The weight gain rate due to oil accumulation on the wind turbine = (1.153 - 1.132) / 1.132 × 100% ≈ 1.85%; Wind speed attenuation rate = (11.4 - 9.83) / 11.4 × 100% ≈ 13.77%; Range Hood B: Overall weight gain rate due to oil accumulation = (24.15 - 23.90) / 23.90 × 100% ≈ 1.05%; The weight gain rate due to oil accumulation on the wind turbine = (1.498 - 1.472) / 1.472 × 100% ≈ 1.77%; Wind speed attenuation rate = (4.31 - 3.68) / 4.31 × 100% ≈ 14.62%; Range Hood C: Overall weight gain rate due to oil accumulation = (24.50 - 23.95) / 23.95 × 100% ≈ 2.30%; The weight gain rate due to oil accumulation on the wind turbine = (1.339 - 1.300) / 1.300 × 100% = 3.00%; Wind speed attenuation rate = (4.76 - 4.56) / 4.76 × 100% ≈ 4.20%; Range Hood D: Overall weight gain rate due to oil accumulation = (24.45 - 24.20) / 24.20 × 100% ≈ 1.03%; The weight gain rate due to oil accumulation on the wind turbine = (1.374 - 1.358) / 1.358 × 100% ≈ 1.18%; Wind speed attenuation rate = (6.46 - 5.58) / 6.46 × 100% ≈ 13.62%; Taking 20 rounds of data as an example, the comprehensive evaluation and grading criteria are as follows: Excellent: Overall oil accumulation weight gain rate ≤1.5%, impeller oil accumulation weight gain rate ≤3%, wind speed reduction rate ≤5%; Acceptable: Overall oil accumulation weight gain rate 1.5%~3%, impeller oil accumulation weight gain rate 3%~6%, wind speed reduction rate 5%~10%; Unqualified: Overall oil accumulation weight gain rate >3%, or impeller oil accumulation weight gain rate >6%, or wind speed reduction rate >10%.

[0147] The test results are as follows: Grading standards: After 20 cycles, the overall weight gain rate is ≤3%, the wind turbine weight gain rate is ≤6%, and the wind speed attenuation rate is ≤10% to be considered qualified; all three indicators are excellent to be considered good, and any indicator exceeding the standard is considered unqualified.

[0148] Range Hood A: Excessive wind speed reduction, therefore unqualified; Range Hood B: Excessive wind speed reduction, therefore unqualified; Range hood C: Pass; Range Hood D: Excessive wind speed attenuation, unqualified.

[0149] Preliminary test conclusions: In this scenario example, the built-in cleaning functions of the four range hoods under test can also be activated. After cleaning, the range hoods were left to stand for 24 hours and then weighed to calculate the cleaning rate. The test results show that range hood B (steam wash) has the highest cleaning rate (≥82%), followed by range hood C (high-pressure water wash) (≥75%), range hood A (centrifugal oil removal) has a cleaning rate of about 65%, and range hood B (hot melt wash) has the lowest cleaning rate (≤60%).

[0150] This application embodiment also provides a testing system for the oil guiding and anti-oil accumulation performance of a range hood, including: The smoke machine to be tested; A fume simulation device for generating fumes using a target fume-generating formula; A control device is used to perform the above-mentioned test method for the oil guiding and anti-oil accumulation performance of the range hood oil circuit.

[0151] In some embodiments, the fume simulation device includes a heating device, a container, and a dripping device, and the target fume-generating formula includes a base liquid and a dripping medium; Containers used to hold the base liquid; Heating equipment used to heat containers; A dripping device is used to add a dripping medium to a container when the temperature of the base liquid is greater than or equal to a target temperature.

[0152] The oil guiding and anti-oil accumulation performance testing system for range hoods disclosed in this application simulates the operation and intermittent working conditions of a range hood in real-world usage scenarios through multiple rounds of cyclic testing. Each round of testing includes alternating periods of operation in a simulated oil fume environment and periods of inactivity, thus better reflecting the actual generation and dissipation patterns of oil fumes in use. After each target round of testing, data acquisition nodes are set up. By initiating a self-cleaning program and stopping the machine for a third period after cleaning, node data is acquired, further simulating the actual cleaning of the range hood through the self-cleaning function. Combining the initial data with node data from multiple data acquisition nodes, a quantitative evaluation of oil guiding and anti-oil accumulation performance is achieved, thereby reducing the interference of subjective experience of testing personnel on the test results and improving the accuracy and horizontal comparability of the oil guiding and anti-oil accumulation performance testing of the range hood's oil circuit.

[0153] In some embodiments, such as Figure 4 As shown, this application embodiment also provides an electronic device 400, including a processor 401, a memory 402, and a computer program stored in the memory 402 and executable on the processor 401. When the program is executed by the processor 401, it implements the various processes of the above-described method embodiment for testing the oil guiding and anti-oil accumulation performance of the range hood oil circuit, and can achieve the same technical effect. To avoid repetition, it will not be described again here.

[0154] This application also provides a non-transitory computer-readable storage medium storing a computer program. When the computer program is executed by a processor, it implements the various processes of the above-described method embodiment for testing the oil guiding and anti-oil accumulation performance of the range hood oil circuit, and can achieve the same technical effect. To avoid repetition, it will not be described again here.

[0155] The processor is the processor in the electronic device described in the above embodiments. The readable storage medium includes computer-readable storage media, such as computer read-only memory (ROM), random access memory (RAM), magnetic disk, or optical disk.

[0156] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0157] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a computer software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) and includes several instructions to cause a terminal (which may be a mobile phone, computer, server, or network device, etc.) to execute the methods described in the various embodiments of this application.

[0158] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

[0159] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0160] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A method for testing the oil guiding and anti-oil accumulation performance of a range hood's oil circuit, characterized in that, include: Obtain the initial data of the range hood under test; The initial data includes the initial operating parameters of the smoke machine under test, the initial weight of the entire smoke machine under test, and the initial weight of the oil circuit components in the smoke machine under test. Using a target smoke-generating formula, oil fumes are generated through a smoke-generating simulation device, and the smoke machine under test is started to undergo multiple rounds of cyclic testing; wherein, one round of the test includes the smoke machine under test running in a simulated oil fume environment for a first duration, and then stopping running for a second duration; Each completed test round constitutes a data acquisition node. The self-cleaning program of the range hood under test is initiated, and the machine is stopped for three hours after cleaning. The node data of the range hood under test is then acquired. The node data includes the node operating parameters of the range hood under test, the node weight of the entire range hood under test, and the node weight of the oil circuit components. The test results of the tobacco appliance under test are generated based on the initial data and the node data from the multiple data acquisition nodes.

2. The method according to claim 1, characterized in that, The acquisition of initial data for the smoke machine under test includes: Place the smoke machine under test in a preset constant temperature environment, remove the check valve at the exhaust end and start the smoke machine under test. When the smoke machine under test is in a stable operating state, collect the initial operating parameters. The test smoke machine was disassembled, and the initial weight of the entire smoke machine and the initial weight of the oil circuit components in the smoke machine were measured.

3. The method according to claim 1, characterized in that, The initial operating parameters include at least one of the following: operating power, motor speed, air inlet velocity, and air volume dynamic balance value; the oil circuit assembly includes a volute and / or a fan wheel.

4. The method according to claim 1, characterized in that, The smoke generation simulation device includes a heating device, a container, and a dripping device; the target smoke generation formula includes a base liquid and a dripping medium; the process of generating oil fumes using the target smoke generation formula through the smoke generation simulation device includes: The base liquid in the container is heated by the heating device. When the temperature of the base liquid is greater than or equal to the target temperature, the dripping medium is added to the container through the dripping device.

5. The method according to claim 1, characterized in that, The target smoke-generating formula includes a first formula for simulating everyday cooking conditions and a second formula for simulating heavy oil smoke conditions.

6. The method according to claim 5, characterized in that, The base liquid of the first formulation includes vegetable oil, and the drop medium of the first formulation includes water; the base liquid of the second formulation includes animal oil, and the drop medium of the second formulation includes a mixture of water, soy sauce, aged vinegar, dark soy sauce, salt and oyster sauce in the target ratio.

7. The method according to claim 1, characterized in that, The process of generating the test results for the smoke machine under test based on the initial data and node data from multiple data acquisition nodes includes: Obtain the change index data of each data acquisition node relative to the initial data; the change index data includes at least one of the following: overall machine oil accumulation weight gain rate, oil circuit component oil accumulation weight gain rate, wind speed attenuation rate, and power change rate. Based on the threshold range of the change index data corresponding to each data acquisition node, the test results, including the oil guiding and anti-oil accumulation performance level of the range hood under test, are determined.

8. The method according to claim 1, characterized in that, The method further includes: Before starting the self-cleaning program, obtain the weight of the entire range hood under test after oil accumulation; The self-cleaning rate of the range hood under test is obtained based on the weight of the entire range hood after oil accumulation, the weight of the nodes of the entire range hood under test, and the initial weight of the entire range hood under test.

9. A testing system for the oil guiding and anti-oil accumulation performance of a range hood, characterized in that, include: The smoke machine to be tested; A fume simulation device is used to generate oil fumes using a target fume-generating formula. A control device for performing the method as described in any one of claims 1-8.

10. The system according to claim 9, characterized in that, The fume simulation device includes a heating device, a container, and a dripping device, and the target fume-generating formula includes a base liquid and a dripping medium; The container is used to hold the base liquid; The heating device is used to heat the container; The dripping device is used to add the dripping medium to the container when the temperature of the base liquid is greater than or equal to the target temperature.

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