Exhaust hood system and control method for an exhaust hood system

Abstract

The application relates to a range hood system and a control method of the range hood. The control method comprises the following steps: when cooking is finished, the range hood is turned off, and the concentration of oil fume in air is monitored; when the monitored concentration of oil fume is greater than a first preset concentration within a certain time after cooking is finished, the range hood is turned on; when the monitored concentration of oil fume is greater than a second preset concentration after a certain time after cooking is finished, the range hood is controlled to maintain an open state; wherein the first preset concentration is greater than the second preset concentration. When the concentration of oil fume in air decreases after the range hood is turned on, the range hood is not directly turned off, but the relationship between the concentration of oil fume at the moment and the second preset concentration is continuously judged. Compared with the prior art, the control method can increase the opening time of the range hood, thereby improving the removal efficiency of the range hood system on oil fume, reducing the number of times of turning on and off the range hood, prolonging the service life of the range hood, and saving energy.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cooking appliances, and in particular to an extractor hood system and a control method of the extractor hood system. BACKGROUND

[0002] An extractor hood is used to remove the waste gas such as oil fume and steam generated by a cooking appliance during cooking, so as to improve the cleanliness of air. The extractor hood is usually installed above the cooking appliance. When the extractor hood is working, negative pressure is generated near the inlet of the extractor hood, so that the oil fume is sucked into the extractor hood. During cooking, the temperature near the cooking appliance is high, and the oil fume rises and can easily enter the extractor hood. Generally, the extractor hood is closed after cooking, and when the concentration of oil fume at a test position increases, the extractor hood can be automatically opened, and when the concentration of oil fume decreases, the extractor hood is closed.

[0003] However, since the oil fume is in a diffusion state in the air, when the extractor hood is automatically opened and the oil fume at the test position is discharged, the oil fume at other positions diffuses to the test position. At this time, the extractor hood is opened again, which causes the extractor hood to be opened and closed multiple times, thereby reducing the service life and working efficiency of the extractor hood. SUMMARY

[0004] The present application provides an extractor hood system and a control method of the extractor hood system, which can reduce the number of times of opening and closing of the extractor hood.

[0005] The present application provides an extractor hood system and a control method of the extractor hood system, which can reduce the number of times of opening and closing of the extractor hood.

[0006] When cooking is completed, the extractor hood is closed, and the concentration of oil fume in the air is monitored.

[0007] When the monitored concentration of oil fume is greater than a first preset concentration within a certain time after cooking is completed, the extractor hood is opened.

[0008] When the monitored concentration of oil fume is greater than a second preset concentration after a certain time after cooking is completed, the extractor hood is controlled to maintain an opened state.

[0009] The first preset concentration is greater than the second preset concentration.

[0010] The control method of the range hood system in the embodiment of the application can increase the opening time of the range hood, thereby improving the removal efficiency of the range hood system on the oil fume, reducing the number of opening and closing of the range hood, prolonging the service life of the range hood, and saving energy.

[0011] In a possible design, after the monitored oil fume concentration is greater than the first preset concentration and the range hood (1) is turned on, the monitoring of the oil fume concentration in the air is continued.

[0012] In the embodiment, the monitoring of the oil fume concentration in the air is not performed immediately after the range hood is turned on, but is performed after the range hood is operated for a first preset time. At this time, the oil fume concentration in the air is relatively stable, and the reliability of the monitoring result is high, thereby improving the accuracy of the control of the range hood system.

[0013] In a possible design, after the monitored oil fume concentration is greater than the second preset concentration after a certain time after the cooking is completed, the control method further includes: controlling the range hood to continue operating for a second preset time, and judging whether the concentration is greater than the first preset concentration after the range hood operates for the second preset time; if yes, controlling the range hood to maintain the opened state; and if no, controlling the range hood to be closed.

[0014] In the embodiment, the second preset time can ensure that the concentration of the oil fume in the air is less than the second preset concentration, increase the operating time of the range hood, promote the oil fume to enter the range hood fully, improve the removal efficiency of the oil fume, and reduce the number of opening and closing of the range hood.

[0015] In a possible design, after the monitored oil fume concentration is greater than the second preset concentration after a certain time after the cooking is completed, the control method further includes:

[0016] When the concentration is less than the second preset concentration, and the time for which the oil fume concentration in the air is less than the second preset concentration reaches a third preset time, it is judged whether the concentration is greater than the first preset concentration; if yes, the range hood is controlled to maintain the opened state; and if no, the range hood is controlled to be closed.

[0017] In the embodiment, the third preset time is the time for which the concentration of the oil fume in the air is less than the second preset concentration, thereby ensuring that the range hood can effectively remove the oil fume in the air.

[0018] In a possible design, the cooking ends a certain time, the monitored oil fume concentration is greater than the first preset concentration, after the oil fume extractor is started, the control method further includes: when the concentration is less than the second preset concentration, determining whether the concentration is less than the first preset concentration; if yes, controlling the oil fume extractor to be turned off; if no, controlling the oil fume extractor to maintain the started state.

[0019] In this embodiment, after the cooking ends and the oil fume extractor is turned off, the concentration of the oil fume in the air only satisfies the triggering condition of the first mode, that is, the oil fume extractor only operates in the first mode and will not enter the second mode.

[0020] In a possible design, when the concentration is between the first preset concentration and the second preset concentration, the oil fume extractor operates at a first power; when the concentration reaches the second preset concentration, the oil fume extractor operates at a second power; the second power is greater than the first power.

[0021] In this embodiment, the operating power of the oil fume extractor in the second mode is greater than the operating power in the first mode, so that the exhaust of the oil fume in the second mode (higher oil fume concentration) is promoted, and the energy consumed by the oil fume extractor in the first mode (lower oil fume concentration) is saved while ensuring the smooth exhaust of the oil fume in the first mode.

[0022] In a possible design, when the concentration is between the first preset concentration and the second preset concentration, the oil fume extractor operates for a fourth preset time; when the concentration reaches the fifth preset concentration, the oil fume extractor operates for a fifth preset time; the second preset time is greater than the fourth preset time.

[0023] In this embodiment, the operating time of the oil fume extractor in the second mode is greater than the operating time in the first mode, so that the exhaust of the oil fume in the second mode (higher oil fume concentration) is promoted, and the energy consumed by the oil fume extractor in the first mode (lower oil fume concentration) is saved while ensuring the smooth exhaust of the oil fume in the first mode.

[0024] Meanwhile, the embodiment of the present application further provides an oil fume extractor system, which includes: an oil fume extractor; a monitoring component, configured to monitor the concentration of oil fume in the air; a control component, connected with the oil fume extractor and the monitoring component; wherein the control component is configured to control the oil fume extractor to be started when the concentration reaches a first preset concentration; the control component is further configured to control the oil fume extractor to maintain the started state when the concentration reaches a second preset concentration; the second preset concentration is greater than the first preset concentration.

[0025] Compared with the prior art, the range hood system can increase the opening time of the range hood, thereby improving the removal efficiency of the range hood system on the oil fume, reducing the number of times of opening and closing of the range hood, prolonging the service life of the range hood, and saving energy.

[0026] In a possible design, the control member is further configured to control the range hood to be turned off when the concentration is less than the first preset concentration.

[0027] In a possible design, the range hood comprises an outlet, and the outlet is in communication with a public flue; and the monitoring member is arranged at a position where the outlet is connected to the public flue. In this embodiment, when the monitoring member is arranged at the position, the monitoring member can not only monitor the concentration of the flue gas in the kitchen, but also monitor the concentration of the flue gas in the public flue, so as to find out whether the flue gas in the public flue flows back into the kitchen in time.

[0028] Meanwhile, the range hood control method and the control device in the embodiments of the present application can be applied to the case that the concentration of the oil fume in the kitchen increases even if the range hood is in the opened state (the first mode) after the cooking is completed, and the concentration of the oil fume in the air in the second mode can be reduced by controlling the range hood to be in the opened state. After the cooking is completed and the range hood is turned off, when the concentration of the oil fume in the air is greater than the first preset concentration, the range hood is turned on and is in the first mode; after the range hood is operated in the first mode for a period of time, if the concentration of the oil fume in the air increases (the concentration of the oil fume in the air is greater than the second preset concentration), the concentration of the oil fume in the air in the second mode can be reduced by controlling the range hood to be in the opened state, the removal efficiency of the range hood system on the oil fume is improved, the range hood can be prevented from being turned on and turned off multiple times in the first mode and / or the second mode, the service life of the range hood is prolonged, and energy is saved.

[0029] It should be understood that the foregoing general description and the following detailed description are only exemplary, and cannot limit the present application. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 Structure schematic diagram of the range hood system and the cooktop provided in the present application in a specific embodiment;

[0031] Figure 2 Flowchart of the control method of the range hood system provided in the present application in a first specific embodiment;

[0032] Figure 3 Flowchart of the control method of the range hood system provided in the present application in a second specific embodiment.

[0033] REFERENCE SIGNS:

[0034] 1 - range hood;

[0035] 11 - inlet;

[0036] 12 - outlet;

[0037] 2 - monitoring component;

[0038] 3 - hob;

[0039] 4 - common flue;

[0040] 5 - wall surface.

[0041] The accompanying drawings, which are incorporated herein and constitute part of this specification, illustrate embodiments consistent with the application and serve to explain the principles of the application. DETAILED DESCRIPTION

[0042] For a better understanding of the technical solutions of the present application, the embodiments of the present application are described in detail below with reference to the drawings.

[0043] It should be clear that the described embodiments are only some of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0044] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms "a", "an" and "the" used in the embodiments of the present application and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise.

[0045] It should be understood that the term "and / or" used herein is only to describe the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents that the front and rear associated objects are a "or" relationship.

[0046] It should be noted that the "up", "down", "left", "right" and other directional words described in the embodiments of the present application are described from the angle shown in the drawings, and should not be understood as a limitation on the embodiments of the present application. In addition, in the context, it should also be understood that when referring to an element connected to another element "on" or "below", it can not only be directly connected to another element "on" or "below", but also indirectly connected to another element "on" or "below" through an intermediate element.

[0047] The embodiments of the present application provide a range hood system, such as Figure 1As shown, the range hood system includes a range hood 1, which is installed above the stove 3 and on the wall 5 of the kitchen. The range hood 1 has an inlet 11 and an outlet 12. The outlet 12 is connected to the common flue 4. The cooking fumes enter the range hood 1 through the inlet 11 and are discharged through the common flue 4.

[0048] Normally, after cooking is finished, range hood 1 is turned off. However, some cooking fumes remain in the air. To remove these fumes, range hood 1 is turned on again. When the concentration of cooking fumes near range hood 1 decreases, it is turned off again. However, because the cooking fumes diffuse in the air, the concentration near range hood 1 rises again, causing range hood 1 to turn on again. Therefore, range hood 1 is turned on and off multiple times after cooking, which affects its lifespan.

[0049] To address the issue of the range hood 1 being turned on and off multiple times after cooking, the range hood system also includes a monitoring component 2 and a control component ( Figure 1 (Not shown in the image), wherein the monitoring component 2 is used to monitor the concentration of cooking fumes in the air. Specifically, the monitoring component 2 monitors the concentration of cooking fumes in the air after cooking. The concentration of cooking fumes specifically represents the content of cooking fumes in the air. For example, the concentration of cooking fumes can be the molar ratio of cooking fumes to air in the same volume. The monitoring component 2 can be a concentration sensor or a VOC gas sensor. The concentration sensor can directly monitor the concentration of cooking fumes, while the VOC gas sensor can be used to monitor air quality, thereby reflecting the concentration of cooking fumes in the air.

[0050] The control component is connected to the range hood 1 and the monitoring component 2. This connection can include signal connections and electrical connections, as long as it enables the control component to control the state of the range hood 1 based on the monitoring results from the monitoring component 2. The control component can be a control unit built into the range hood 1 or a control assembly located externally to the range hood 1.

[0051] Based on this range hood system, such as Figure 2 and Figure 3 As shown, its control method includes the following steps:

[0052] S1: When the range hood 1 is in the off state, monitor the concentration of cooking fumes in the air;

[0053] The monitoring component 2 can be used to monitor the concentration of oil fume in the air. The monitoring component 2 can be used to monitor the concentration of oil fume in the air after cooking. The concentration of oil fume can be used to represent the content of oil fume in the air. For example, the concentration of oil fume can be the molar ratio of oil fume to air in the same volume. The monitoring component 2 can be a particulate matter concentration sensor or a VOC gas sensor. The particulate matter concentration sensor can be used to directly monitor the concentration of oil fume. The VOC gas sensor can be used to monitor the air quality, thereby reflecting the concentration of oil fume in the air.

[0054] The monitoring component 2 can be used to monitor the concentration of oil fume in different positions in the kitchen. The monitoring component 2 can be arranged on the housing of the range hood 1, arranged at a distance from the housing of the range hood 1, or arranged inside the range hood 1. Therefore, the monitoring position of the monitoring component 2 is not limited in the present application.

[0055] S2: determining whether the concentration reaches a first preset concentration. If yes, performing step S31. If no, performing step S32.

[0056] S31: controlling the range hood 1 to start.

[0057] S32: controlling the range hood 1 to stop.

[0058] Meanwhile, after step S31, i.e. after the range hood 1 starts, the concentration of oil fume in the air is continuously monitored, and step S4 is performed: determining whether the concentration reaches a second preset concentration. If yes, performing step S5.

[0059] S5: controlling the range hood 1 to maintain the starting state.

[0060] The first preset concentration and the second preset concentration are both critical values of the concentration of oil fume in the air. The first preset concentration and the second preset concentration can be critical values in different modes. The first preset concentration is a critical value of the concentration of oil fume in the air in the first mode of the range hood 1. The second preset concentration is a critical value of the concentration of oil fume in the air in the second mode of the range hood 1. The second preset concentration is greater than the first preset concentration.

[0061] When the cooking is finished and the range hood 1 is closed, the concentration of the oil fume in the air is relatively large, and when the concentration is greater than the first preset concentration, the range hood 1 is opened to suck the oil fume, and at this time, the range hood 1 is in the first mode. Then, when the monitored concentration of the oil fume in the air is greater than the second preset concentration, it indicates that the oil fume in the air still does not meet the requirements, and at this time, the range hood 1 is controlled to maintain the opened state, and at this time, the range hood 1 is in the second mode. The range hood system and the control method thereof in the application can continue to judge the relationship between the concentration of the oil fume at this time and the second preset concentration after the range hood 1 is opened for a period of time, rather than directly closing the range hood 1, compared with the prior art, the control method can increase the opening time of the range hood 1, thereby improving the removal efficiency of the oil fume by the range hood system, reducing the number of opening and closing of the range hood 1, prolonging the service life of the range hood 1, and saving energy.

[0062] In a possible design, the second preset concentration is greater than the first preset concentration, that is, the triggering critical condition of the second mode is greater than the triggering critical condition of the first mode, and at this time, the first mode and the second mode are as follows: in the first mode, the oil fume in the air can be caused by the backflow of the public chimney 4 (or caused by the residual oil fume after the cooking is finished), the concentration of the oil fume in the air is A in the first mode, and the concentration of the oil fume in the air will not rise quickly (for example, the oil fume concentration rises by 5% to 10% per unit time) in this mode; in the second mode, the oil fume in the air can be caused by the backflow of the public chimney 4 (or the residual oil fume in the kitchen after the cooking is finished) and the emission of the oil fume containing food in the kitchen, the concentration of the oil fume in the air is A+B in the second mode, and since the emission amount of the oil fume containing food after the cooking is finished is large (B is large), the concentration of the oil fume in the air monitored in this mode rises quickly (for example, the oil fume concentration rises by more than 10% per unit time), that is, the concentration of the oil fume in the second mode is greater than the concentration of the oil fume in the first mode, that is, A+B>A, and the second preset concentration is also greater than the first preset concentration.

[0063] Therefore, the range hood 1 control method and control device in this application embodiment can be applied to situations where the concentration of oil fumes in the kitchen still increases after a period of time following cooking, even if the range hood 1 is in the on state (first mode). Furthermore, it can reduce the concentration of oil fumes in the air in the second mode by controlling the range hood 1 to remain on. After cooking is finished and the range hood 1 is turned off, when the concentration of oil fumes in the air is greater than a first preset concentration, the range hood 1 is turned on and enters the first mode. After running in the first mode for a period of time, if the concentration of oil fumes in the air increases instead (the concentration of oil fumes in the air is greater than a second preset concentration), the concentration of oil fumes in the air in the second mode is reduced by controlling the range hood 1 to remain on, thereby improving the efficiency of the range hood system in removing oil fumes. It also prevents the range hood 1 from being turned on and off multiple times in the first mode and / or the second mode, thus extending the lifespan of the range hood 1 and saving energy.

[0064] It should be noted that this control method applies only to the situation where cooking is finished and range hood 1 is turned off. That is, the steps of the above control method are only performed when cooking is finished and range hood 1 is turned off. In actual operation, the following methods can be used to determine whether the state of "cooking finished and range hood 1 turned off" is in effect: Method 1: Determine whether the state is in effect based on the status of stove 3. That is, if range hood 1 is also turned off when stove 3 is turned off, then the state of "cooking finished and range hood 1 turned off" is determined. Method 2: A switch can be added to range hood 1, allowing the user to control the state of "cooking finished and range hood 1 turned off" manually. Of course, other methods can also be used to determine whether the state of "cooking finished and range hood 1 turned off" is in effect.

[0065] In one possible design, step S31 above further includes the following step: after controlling the range hood 1 to run for a first preset time, monitoring the concentration of oil fumes in the air.

[0066] In this embodiment, the concentration of cooking fumes in the air is not monitored immediately after the range hood 1 is turned on, but rather after the range hood 1 has been running for a first preset time. At this time, the concentration of cooking fumes in the air is relatively stable, and the reliability of the monitoring results is high, thereby improving the accuracy of the range hood system control.

[0067] like Figure 2 In the embodiment shown, step S5 further includes: controlling the range hood 1 to continue running for a second preset time, and after the range hood 1 has run for the second preset time (at this time, the range hood 1 is running in the second mode), returning to step S2, that is, continuing to determine whether the concentration is greater than the first preset concentration.

[0068] S31: If so, control the range hood 1 to remain on (at this time, the range hood 1 operates in the first mode);

[0069] S32: If no, control the extractor hood 1 to be closed.

[0070] In this embodiment, after the cooking is finished and the extractor hood 1 is closed, when the concentration of oil fume in the air is greater than the first preset concentration and the extractor hood 1 is opened, the extractor hood 1 is in the first mode, and in the first mode, after the extractor hood 1 runs for the first preset time, when the concentration of oil fume in the air is greater than the second preset concentration and the extractor hood 1 is maintained to be opened, the extractor hood 1 is in the second mode, and in the second mode, after the extractor hood 1 runs for the second preset time, the extractor hood 1 exits the second mode and determines whether the concentration of oil fume in the air is less than the first preset concentration, that is, determines whether the extractor hood 1 meets the first mode, if yes, the extractor hood 1 enters the first mode to run, and if no, the extractor hood 1 is closed.

[0071] It should be noted that in this embodiment, the second preset time can ensure that the concentration of oil fume in the air is less than the second preset concentration, in order to achieve this purpose, the second preset time can be set to a relatively long time, so as to ensure that the extractor hood 1 can effectively remove the oil fume in the air, for example, it can be set to 30 min.

[0072] As shown in the embodiment shown in Figure 3 After the concentration of oil fume in the air is greater than the second preset concentration and the extractor hood 1 is maintained to be opened (that is, after the extractor hood 1 runs for a period of time in the second mode), the following steps are further included:

[0073] S7: Determine whether the concentration of oil fume in the air is less than the second preset concentration, and after the time when the concentration of oil fume in the air is less than the second preset concentration reaches the third preset time, return to step S2, that is, continue to determine whether the concentration of oil fume in the air is greater than the first preset concentration, if yes, the extractor hood 1 is maintained to be opened (at this time, the extractor hood 1 runs in the first mode), and if no, the extractor hood 1 is closed.

[0074] In this embodiment, after the cooking is finished and the extractor hood 1 is closed, when the concentration of oil fume in the air is greater than the first preset concentration and the extractor hood 1 is opened, the extractor hood 1 is in the first mode, and in the first mode, after the extractor hood 1 runs for the first preset time, when the concentration of oil fume in the air is greater than the second preset concentration and the extractor hood 1 is maintained to be opened, the extractor hood 1 is in the second mode, when the concentration of oil fume in the air is still greater than the second preset concentration, the extractor hood 1 continues to run in the second mode, when the concentration of oil fume in the air is less than the second preset concentration and the time when the concentration of oil fume in the air is less than the second preset concentration reaches the third preset time, the extractor hood 1 exits the second mode and determines whether the concentration of oil fume in the air is greater than the first preset concentration, if yes, the extractor hood 1 enters the first mode to run, and if no, it is closed.

[0075] It should be noted that in the embodiment, after the range hood 1 runs in the second mode for a period of time, the range hood 1 can continue to run in the second mode for a third preset time, the third preset time being a time during which the concentration of oil fume in the air is less than the second preset concentration, so as to ensure that the range hood 1 can effectively remove the oil fume in the air. For example, the third preset time can be set to 20 min.

[0076] Therefore, in the above two embodiments, after the cooking is completed and the range hood 1 is turned off, the range hood 1 can run in the first mode and the second mode, so as to increase the running time, promote the oil fume to fully enter the range hood 1, improve the oil fume removal efficiency, and reduce the time of turning on and turning off the range hood 1. Figure 2 The embodiment shown in the figure is different from the embodiment shown in Figure 3 in that how to determine whether to enter the first mode when the range hood 1 runs in the second mode.

[0077] In the above embodiments, as shown in Figure 2 and Figure 3 , after step S4, when the concentration is less than the second preset concentration (i.e., the triggering condition of the second mode is not met), it is returned to step S2, i.e., it is determined whether the concentration is less than the first preset concentration. If yes, the range hood 1 is controlled to be turned off. If no, the range hood 1 is controlled to be maintained in the turned-on state (at this time, the range hood 1 runs in the first mode).

[0078] In the embodiment, after the cooking is completed and the range hood 1 is turned off, when the concentration of oil fume in the air is greater than the first preset concentration and the range hood 1 is turned on, the range hood 1 is in the first mode, and in the first mode, after the range hood 1 runs for the first preset time, when the concentration of oil fume in the air is less than the second preset concentration, the range hood 1 does not enter the second mode. At this time, it is continuously determined whether the concentration is greater than the first preset concentration. If yes, the range hood 1 continues to run in the first mode. If no, the range hood 1 is turned off.

[0079] Alternatively, after step S4, when the concentration is less than the second preset concentration (i.e., the triggering condition of the second mode is not met), the range hood 1 can be directly turned off. That is, after the cooking is completed and the range hood 1 is turned off, when the range hood 1 runs in the first mode for a period of time and the concentration of oil fume in the air does not meet the triggering condition of the second mode, the range hood 1 can be directly turned off. At this time, during the process in which the range hood 1 runs in the first mode for a period of time, the oil fume in the air can be removed.

[0080] Therefore, in the embodiment, after the cooking is completed and the range hood 1 is turned off, the concentration of oil fume in the air only meets the triggering condition of the first mode, i.e., the range hood 1 only runs in the first mode and does not enter the second mode.

[0081] Based on this, in the above embodiments, when the concentration of oil fume in the air is between the first preset concentration and the second preset concentration, the range hood 1 operates at the first power and is in the first mode; when the concentration of oil fume in the air is greater than the second preset concentration, the range hood 1 operates at the second power and is in the second mode. At this time, the second power is greater than the first power, that is, the operating power of the range hood 1 in the second mode is greater than the operating power in the first mode, so as to promote the exhaust of oil fume in the second mode (high concentration of oil fume) and save the energy of the range hood 1 operating in the first mode while ensuring the smooth exhaust of oil fume in the first mode (low concentration of oil fume).

[0082] In another possible design, when the concentration of oil fume in the air is between the first preset concentration and the second preset concentration, the range hood 1 is in the first mode and operates for a fourth preset time; when the concentration of oil fume in the air reaches the second preset concentration, the range hood 1 is in the second mode and operates for a fifth preset time, where the fifth preset time is greater than the fourth preset time. That is, the operating time of the range hood 1 in the second mode is greater than the operating time in the first mode, so as to promote the exhaust of oil fume in the second mode (high concentration of oil fume) and save the energy of the range hood 1 operating in the first mode while ensuring the smooth exhaust of oil fume in the first mode (low concentration of oil fume).

[0083] In the above embodiments, as shown in Figure 1 The range hood 1 includes an inlet 11 and an outlet 12, where the inlet 11 faces the cooktop 3, and the outlet 12 communicates with the public flue 4, so as to exhaust the oil fume in the range hood 1 to the public flue 4. The monitoring component 2 is installed at the position where the outlet 12 of the range hood 1 connects with the public flue 4. When the monitoring component 2 is installed at this position, it can not only monitor the concentration of oil fume in the kitchen, but also monitor the concentration of oil fume in the public flue 4, so as to timely find out whether the oil fume flows back from the public flue 4 into the kitchen.

[0084] In summary, in the embodiments of the present application, after the cooking is completed and the range hood 1 is turned off, when the concentration of oil fume meets the triggering condition of the first mode, the range hood 1 can operate in the first mode for a period of time t1, and after operating for a period of time t1, the range hood 1 does not directly turn off, but continues to judge whether the concentration of oil fume meets the triggering condition of the second mode. If it meets, the range hood 1 operates in the second mode for a period of time t2. If it does not meet, it continues to judge whether the concentration of oil fume in the air still meets the triggering condition of the first mode. If it meets, the range hood 1 continues to be turned on and operates in the first mode for a period of time t3. If it does not meet (the concentration of oil fume in the air is small, which meets the requirement), the range hood 1 is turned off.

[0085] Therefore, the existing range hood opens for a time t1 after cooking, while the range hood 1 of the present application opens for a time of t1, t1+t2 or t1+t2+t3 after cooking. Obviously, the range hood system and the control method thereof can effectively increase the opening time of the range hood 1 after cooking, thereby improving the removal rate of oil fume and reducing the number of opening and closing of the range hood 1.

[0086] The preferred embodiments of the present application have been described above with the aid of drawings and are not intended to limit the present application, and various modifications and changes can be made by those skilled in the art to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A control method of an extractor hood system, the extractor hood system comprising an extractor hood (1), characterized in that, The control method comprises: cooking is completed, the extractor hood (1) is in a closed state, monitoring the concentration of oil fume in the air; when the monitored concentration of oil fume is greater than a first preset concentration, turning on the extractor hood (1); after the monitored concentration of oil fume is greater than the first preset concentration and the extractor hood (1) is turned on, continuing to monitor the concentration of oil fume in the air; when the monitored concentration of oil fume is greater than a second preset concentration, controlling the extractor hood (1) to continue to operate for a second preset time, and after the extractor hood (1) operates for the second preset time, judging whether the concentration is greater than the first preset concentration; if yes, controlling the extractor hood (1) to maintain an open state; if no, controlling the extractor hood (1) to be closed; or when the monitored concentration of oil fume is greater than a second preset concentration, controlling the extractor hood (1) to continue to operate, and when the concentration of oil fume in the air is less than the second preset concentration and the time during which the concentration of oil fume in the air is less than the second preset concentration reaches a third preset time, judging whether the concentration is greater than the first preset concentration; if yes, controlling the extractor hood (1) to maintain an open state; if no, controlling the extractor hood (1) to be closed; wherein the second preset concentration is greater than the first preset concentration.

2. The control method according to claim 1, characterized by, "after the monitored concentration of oil fume is greater than the first preset concentration and the extractor hood (1) is turned on, continuing to monitor the concentration of oil fume in the air" comprises: after the extractor hood (1) operates for a first preset time, continuing to monitor the concentration of oil fume in the air.

3. The control method according to claim 1, characterized by, after the monitored concentration of oil fume is greater than a first preset concentration and the extractor hood (1) is turned on, the control method further comprises: when the monitored concentration is less than the second preset concentration, judging whether the concentration is less than the first preset concentration; if yes, controlling the extractor hood (1) to be closed; if no, controlling the extractor hood (1) to maintain an open state.

4. The control method according to any one of claims 1 to 3, characterized by, when the concentration is between the first preset concentration and the second preset concentration, the extractor hood (1) operates at a first power; when the concentration is greater than the second preset concentration, the extractor hood (1) operates at a second power; the second power is greater than the first power.

5. The control method according to any one of claims 1 to 3, characterized by, when the concentration is between the first preset concentration and the second preset concentration, the extractor hood (1) operates for a fourth preset time; when the concentration is greater than the second preset concentration, the extractor hood (1) operates for a fifth preset time; the fifth preset time is greater than the fourth preset time.

6. A range hood system characterized by, The extractor hood system comprises: an extractor hood (1); a monitoring component (2) for monitoring the concentration of oil fume in the air; a control component connected with the extractor hood (1) and the monitoring component (2); wherein the control component is configured to control the extractor hood (1) to be turned on when the concentration is greater than a first preset concentration; The control component is further configured to control the range hood (1) to continue running when the concentration is greater than a second preset concentration, and to determine whether the concentration is greater than the first preset concentration after the range hood (1) runs for the second preset time; if yes, control the range hood (1) to maintain an open state; if no, control the range hood (1) to be closed; or The control component is further configured to control the range hood (1) to continue running when the concentration is greater than a second preset concentration, and to determine whether the concentration is greater than the first preset concentration after the concentration of oil fume in the air is less than the second preset concentration and the time less than the second preset concentration reaches a third preset time; if yes, control the range hood (1) to maintain an open state; if no, control the range hood (1) to be closed. The second preset concentration is greater than the first preset concentration.

7. The range hood system of claim 6, wherein, The control component is further configured to determine whether the concentration is less than the first preset concentration when the concentration is greater than a first preset concentration after the range hood (1) is turned on and the concentration is less than a second preset concentration; if yes, control the range hood (1) to be closed; if no, control the range hood (1) to maintain an open state.

8. The range hood system of claim 6, wherein, The range hood (1) comprises an outlet (12), and the outlet (12) is in communication with a public flue (4); The monitoring component (2) is arranged at a position where the outlet (12) is connected with the public flue (4).

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