CN117948624A - Range hood and control method thereof - Google Patents

Abstract

The embodiment of the application provides a range hood and a range hood control method. The range hood comprises: the device comprises a case assembly, a smoke collecting assembly, a driving device, a first distance measuring device, a second distance measuring device and a controller, wherein the smoke collecting assembly is connected with the case assembly in a lifting manner, and an air suction port is arranged on the smoke collecting assembly; the driving device is connected with the smoke collecting assembly to drive the smoke collecting assembly to lift; the first distance measuring device and the second distance measuring device are distributed up and down, are arranged on the smoke collecting assembly and face forward, and are used for detecting the distance and respectively generating a first distance measuring signal and a second distance measuring signal; the controller is used for acquiring the first ranging signal and the second ranging signal in real time, and controlling the driving device to drive the smoke collecting assembly so that the upper edge of the cooking appliance corresponding to the smoke collecting assembly is located between the first ranging device and the second ranging device in the vertical direction. This lampblack absorber can be to the accurate detection of the state of its the cooking utensil of place ahead, and then can realize the accurate lift control to collection cigarette subassembly.

Description

Range hood and control method thereof

Technical Field

The application relates to the technical field of kitchen appliances, in particular to a range hood and a range hood control method.

Background

Kitchen hoods have been widely used as kitchen appliances. The user utilizes cooking utensil to cook the in-process can produce the oil smoke, through using the lampblack absorber, can effectively reduce the oil smoke. For the user, not only the amount of the oil smoke inhaled by the user is reduced, the health of the user is protected, but also the cleanliness of the kitchen of the user is maintained.

In some existing range hoods, the height of the air suction opening can be automatically adjusted according to the height of the cooking utensil, so that the air suction opening is close to the cooking utensil as much as possible, and the maximum smoke discharging effect is exerted.

However, when these range hoods operate, it may be difficult to detect the change of the cooking appliance below, and thus the height of the air suction port is adaptively adjusted according to the change of the cooking appliance, so that the optimal smoke exhaust effect is not achieved, and the user experience is poor.

Disclosure of Invention

In order to at least partially solve the problems in the prior art, according to one aspect of the present application, there is provided a range hood, including a chassis assembly, a fume collecting assembly, a driving device, a first ranging device, a second ranging device, and a controller, wherein the fume collecting assembly is liftably connected to the chassis assembly, and a fume suction port is provided on the fume collecting assembly; the driving device is connected with the smoke collecting assembly and used for driving the smoke collecting assembly to lift; the first distance measuring device and the second distance measuring device are distributed up and down, are arranged on the smoke collecting assembly and face forward, and are used for detecting the distance and respectively generating a first distance measuring signal and a second distance measuring signal; the controller is connected with the driving device, the first ranging device and the second ranging device and is used for acquiring the first ranging signal and the second ranging signal in real time and controlling the driving device to drive the smoke collecting assembly according to the first ranging signal and the second ranging signal so that the upper edge of the cooking appliance corresponding to the smoke collecting assembly is located between the first ranging device and the second ranging device in the vertical direction.

Among the above-mentioned technical scheme, because first range unit and the second range unit who goes up and down in step with collection cigarette subassembly can acquire its place ahead distance information in real time, consequently can realize the accurate detection to the state of the cooking utensil of its place ahead, and then can realize the accurate lift control to collection cigarette subassembly in the within range that induced drafts. In particular, any change situation of the cooking appliance in the cooking process, such as heightening of the cooking appliance, can be sharply detected by utilizing the first distance measuring device and the second distance measuring device, and the smoke collecting assembly can be adaptively and automatically controlled according to the change situation. Therefore, on the premise of ensuring the convenience of cooking operation of a user, the efficiency of the range hood is greatly improved, and further the user experience is remarkably improved.

Illustratively, the first ranging device is closer to the chassis assembly than the second ranging device, and the controller controls the driving device to drive the smoke collecting assembly according to the first ranging signal and the second ranging signal, including performing the following operations: when the distance shown by the first distance measurement signal and the distance shown by the second distance measurement signal are smaller than the preset distance, the control driving device drives the smoke collecting assembly to ascend until the distance shown by the first distance measurement signal is larger than the preset distance, and the control driving device stops running.

According to the technical scheme, the upper edge of the cooking appliance is located between the first distance measuring device and the second distance measuring device in height, and further the smoke exhaust effect of the range hood is guaranteed; and the logic is simple, the implementation is easy and the error is not easy. In addition, when the height of the cooking utensil is increased, for example, when a new cooker is added to the upper part of the cooking utensil, the smoke collecting assembly can be timely and accurately controlled to ascend, and the user experience is improved.

Illustratively, the first ranging device is closer to the chassis assembly than the second ranging device, and the controller controls the driving device to drive the smoke collecting assembly according to the first ranging signal and the second ranging signal, including performing the following operations: when the distance shown by the first ranging signal and the distance shown by the second ranging signal are both larger than the preset distance, the driving device is controlled to drive the smoke collecting assembly to descend, and when the distance shown by the second ranging signal is smaller than the preset distance, the driving device is controlled to stop running.

According to the technical scheme, the upper edge of the cooking appliance is located between the first distance measuring device and the second distance measuring device in height, and further the smoke exhaust effect of the range hood is guaranteed; and the logic is simple, the implementation is easy and the error is not easy. In addition, when the height of the cooking utensil is reduced, for example, when a part of cookware is taken off from the upper part of the cooking utensil, the smoke collecting assembly can be timely and accurately controlled to descend, and the user experience is improved.

The range hood further comprises an output device, and the controller is further used for controlling the output device to alarm when the distance shown by the first ranging signal is smaller than a preset distance and the distance shown by the second ranging signal is larger than the preset distance.

According to the technical scheme, for the situation that the ranging signals generated based on the first ranging device and the second ranging device are difficult to accurately reflect the height of the cooking utensil, the alarming information is output, so that a user can be helped to learn and adjust the abnormal working condition of the range hood in time, and the range hood is prevented from working in the abnormal condition for a long time.

The controller is also used for controlling the driving device to drive the smoke collecting assembly to rise to the highest position when the starting and/or the shutting of the range hood are/is determined.

When the oil smoke ventilator is started, the smoke collecting assembly is controlled to rise to the highest position, so that the accurate control of the oil smoke ventilator in the working process of the oil smoke ventilator can be ensured, the reliability of the oil smoke ventilator is improved, and the control logic can be simplified. When the kitchen ventilator is shut down, the smoke collecting assembly is controlled to rise to the highest position, and on one hand, the largest space can be reserved for a user when the user does not use the kitchen ventilator. On the other hand, the smoke collecting assembly can be prevented from being exposed to the outside under the condition that the range hood is not opened, and is unnecessarily polluted, and meanwhile, the appearance is influenced. Further, the device can be lifted to the highest position, so that the damage to personnel and machines caused by accidental collision can be avoided.

The number of the cigarette collecting assemblies is the same as that of the driving devices, and the driving devices drive the cigarette collecting assemblies one by one, and each cigarette collecting assembly is provided with a first distance measuring device and a second distance measuring device.

In the technical scheme, the range hood comprises a plurality of smoke collecting assemblies and driving devices respectively corresponding to the smoke collecting assemblies. Therefore, the smoke collecting assembly corresponding to each furnace end can be independently controlled to be at the optimal smoke discharging height, and the optimal smoke discharging effect is realized; but also can simplify the control logic of the smoke collecting assembly.

The center points of the horizontal projections of the first distance measuring device and the second distance measuring device are located on the longitudinal center axis of the horizontal projection of the burner.

According to the scheme, the first distance measuring device and the second distance measuring device are arranged at the position close to the right rear of the center of the furnace end, whether the cooking utensil exists or not can be effectively and accurately detected, detection errors are avoided, and therefore the smoke collecting assembly can be lifted to the most proper height. Furthermore, the efficient use of the range hood can be realized on the premise of being convenient for a user to cook.

Illustratively, the distance between the first distance measuring device and the second distance measuring device is 3 to 5 cm.

According to the technical scheme, the misjudgment probability of the controller on the position of the upper edge of the cooking utensil can be reduced, most cooking utensils on the market can be considered, and the height of the current cooking utensil can be accurately determined. Therefore, the smoke collecting assembly is accurately controlled in real time and always kept at the optimal smoke collecting position, and the smoke discharging effect of the range hood is further guaranteed.

Illustratively, the first ranging device and the second ranging device are ultrasonic ranging devices.

The ultrasonic distance measuring device has stable performance, lower cost, accurate measuring distance and small blind area; the accuracy of the distance information obtained by the controller is guaranteed, and then the accurate control effect of the controller on the smoke collecting assembly can be guaranteed. The range hood with the ultrasonic distance measuring device can be suitable for various common cooking appliances in the market, is stable and reliable, and can effectively improve the use experience of users.

Illustratively, the controller acquiring the first ranging signal and the second ranging signal in real time includes performing the following operations: the first ranging signal and the second ranging signal are acquired every predetermined time interval, wherein the predetermined time is greater than or equal to 250 milliseconds and less than or equal to 1500 milliseconds.

In the technical scheme, the change of the cooking utensil can be detected in real time, the lifting of the smoke collecting assembly can be controlled in time according to the detected change, and the excessive requirement on the computing capacity of the controller is avoided, so that the low cost of the range hood is ensured.

The invention discloses a control method of a range hood, which comprises the following steps: the device comprises a case assembly, a smoke collecting assembly, a driving device, a first distance measuring device and a second distance measuring device, wherein the smoke collecting assembly is connected with the case assembly in a lifting manner, and an air suction port is arranged on the smoke collecting assembly; the driving device is connected with the smoke collecting assembly and used for driving the smoke collecting assembly to lift; the first distance measuring device and the second distance measuring device are distributed up and down, are arranged on the smoke collecting assembly and face forward, and are used for detecting the distance and respectively generating a first distance measuring signal and a second distance measuring signal; the control method comprises the following steps: the method comprises the steps of acquiring a first ranging signal and a second ranging signal in real time, and controlling a driving device to drive a smoke collecting assembly according to the first ranging signal and the second ranging signal so that the upper edge of a cooking appliance corresponding to the smoke collecting assembly is located between a first ranging device and a second ranging device in the vertical direction.

According to the technical scheme, the smoke collecting assembly can be adaptively and automatically controlled according to the change condition of the cooking utensil, and the efficiency of the range hood for sucking smoke is greatly improved on the premise that the convenience of cooking operation of a user is ensured, so that the user experience is remarkably improved.

Illustratively, the first ranging device is closer to the chassis assembly than the second ranging device, and the controlling driving device drives the smoke collecting assembly according to the first ranging signal and the second ranging signal comprises: when the distance shown by the first distance measurement signal and the distance shown by the second distance measurement signal are smaller than the preset distance, the control driving device drives the smoke collecting assembly to ascend until the distance shown by the first distance measurement signal is larger than the preset distance, and the control driving device stops running.

Illustratively, the first ranging device is closer to the chassis assembly than the second ranging device, and the controlling driving device drives the smoke collecting assembly according to the first ranging signal and the second ranging signal comprises: when the distance shown by the first ranging signal and the distance shown by the second ranging signal are both larger than the preset distance, the driving device is controlled to drive the smoke collecting assembly to descend, and when the distance shown by the second ranging signal is smaller than the preset distance, the driving device is controlled to stop running.

Illustratively, the first ranging device is closer to the chassis assembly than the second ranging device, the control method further comprising: and when the distance shown by the first ranging signal is smaller than the preset distance and the distance shown by the second ranging signal is larger than the preset distance, executing alarm operation.

Illustratively, the control method further comprises: when the starting and/or the shutdown of the range hood are determined, the driving device is controlled to drive the smoke collecting assembly to rise to the highest position.

In the summary, a series of concepts in a simplified form are introduced, which will be further described in detail in the detailed description section. This summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.

Advantages and features of the invention are described in detail below with reference to the accompanying drawings.

Drawings

The following drawings are included to provide an understanding of the application and are incorporated in and constitute a part of this specification. Embodiments of the present application and their description are shown in the drawings to explain the principles of the application. In the drawings of which there are shown,

Fig. 1 shows a schematic view of a range hood according to an embodiment of the present application;

Fig. 2a and 2b show side views of a range hood and its different working environments, respectively, according to an embodiment of the present application; and

Fig. 3 shows a schematic flow chart of a range hood control method according to an embodiment of the present application.

Wherein the above figures include the following reference numerals:

110. A chassis assembly; 120. a smoke collecting assembly; 121. an air suction port; 130. a driving device; 141. a first distance measuring device; 142. a second distance measuring device; 150. and a controller.

Detailed Description

In the following description, numerous details are provided to provide a thorough understanding of the application. However, it will be understood by those skilled in the art that the following description illustrates preferred embodiments of the application by way of example only and that the application may be practiced without one or more of these details. Furthermore, some technical features that are known in the art have not been described in detail in order to avoid obscuring the application.

As described above, some conventional range hoods can adjust the height of the air intake according to the cooking appliance below when the range hood starts to operate. However, when some changes occur in the lower cooking appliance, it may be difficult to adjust the height of the suction port in time according to the change situation. For example, in some cooking scenarios, a steamer with one or more layers of drawers is desirable to increase cooking efficiency. The user may first place the cooking appliance with water on the stove head below the range hood, at which time the range hood detects the cooking appliance and adjusts the position of the suction port according to the cooking appliance. Then, the user may put the upper cooking appliance provided with the steaming drawer on the cooking appliance on the burner. The conventional range hood cannot detect the change condition of the cooking appliance which is added on the placed cooking appliance, so that the air suction inlet of the range hood cannot be automatically adjusted in height according to the change condition, and the smoking effect is further reduced.

In order to at least partially solve the above-mentioned problems, according to an aspect of an embodiment of the present application, there is provided a range hood. Fig. 1 shows a schematic view of a range hood according to an embodiment of the present application. The range hood may include a cabinet assembly 110, a smoke collecting assembly 120, a driving device 130, a first ranging device 141, a second ranging device 142, and a controller 150.

The chassis assembly 110 may include a chassis housing, a blower (not shown) disposed inside the chassis housing, a smoke collecting duct (not shown), and the like. The top of the fume collecting duct may include an air outlet, which may be located at the top of the chassis housing. The case housing may be rectangular or the like. The fan may be any fan that is present or developed in the future. A fan may be used to create the negative pressure. The fan may be communicated with the smoke collecting assembly 120 through a smoke collecting pipe to suck the smoke around the smoke collecting assembly 120 into the smoke collecting pipe and discharge the smoke through an air outlet. The number of fans can be one or a plurality of fans. In the case that the number of the fans is multiple, each fan can also independently operate and corresponds to one smoke collecting pipeline. The smoke collecting duct may include a hard tube or a flexible tube (e.g., a bellows tube), and is not particularly limited.

The smoke collecting assembly 120 is connected with the chassis assembly 110 in a lifting manner. The chassis assembly 110 and the smoke collecting assembly 120 may be connected by a lifting rail. By way of example and not limitation, the lifting rail may be disposed inside the chassis assembly 110 or may be disposed outside the chassis housing rear wall, e.g., the lifting rail may be fixedly disposed on both the left and right sides of the chassis assembly 110 rear wall. The smoke collecting assembly 120 may be moved up and down along the elevating rail by the driving device 130. When the smoke collecting assembly 120 gradually descends from the first position to the second position along the lifting rail, the hidden part of the smoke collecting assembly can extend out of the case assembly 110 at a certain speed and be exposed, and the hidden part of the smoke collecting assembly can be completely exposed out of the case assembly 110 in the lowest position. While the smoke collecting assembly 120 is ascending, the hidden part of the smoke collecting assembly can be gradually hidden into the case housing or behind the case assembly 110. And may be completely hidden from view inside the chassis housing or behind the chassis assembly 110 when the smoke collection assembly 120 is in the uppermost position.

The concealable portion of the smoke collecting assembly 120 may be all or part thereof. Alternatively, the smoke collection assembly 120 may be entirely hidden. When the smoke collecting assembly 120 is located at the highest position, the smoke collecting assembly 120 may be entirely accommodated inside the smoke collecting housing or at the rear side of the cabinet housing. The proposal can ensure the conciseness and beautiful appearance of the range hood. And in the case of transportation, for example, the volume can be reduced, and the space can be saved. Alternatively, the smoke collecting assembly 120 may be only partially hidden, for example, the portion of the smoke collecting assembly above the air suction port 121, i.e. whether the hidden portion is hidden has a smaller influence on the air suction effect. In this way, a good suction effect of the smoke collecting assembly 120 can be ensured regardless of any position of the smoke collecting assembly 120 between the highest position and the lowest position. Thus, the flexible lifting of the smoke collecting assembly 120 can be realized, the ideal air suction range of the range hood is ensured, and the appearance effect of the range hood can be improved. The partially concealed smoke collecting assembly 120 can also be reduced in size and save space.

The smoke collecting assembly 120 may be provided with a suction inlet 121. Under the condition that the fan works, the oil smoke near the air suction port 121 can be sucked into the air suction port 121 and then discharged through the smoke collecting pipeline. The shape of the suction port 121 may be any shape, and the number thereof may be any number, without being particularly limited. Alternatively, the number of the suction ports 121 may be plural, and each suction port 121 may correspond to a burner located therebelow. When the number of the air suction openings 121 is plural, each air suction opening 121 may be connected to a corresponding fan through a smoke collecting pipe, so as to independently control the fan and absorb the smoke nearby. Or the number of the air inlets 121 is multiple, the number of the fans is 1, and the oil smoke sucked from the air inlets 121 can be sucked to the fans through one smoke collecting pipeline and discharged through the air outlets. An air deflector which can be automatically opened and closed can be further arranged on the outer side of each air suction inlet 121, so that the opening and closing of each air suction inlet 121 can be independently controlled.

The suction inlet 121 of the smoke collecting assembly 120 may be provided at a side of the bottom of the smoke collecting assembly 120. Thus, when the smoke collecting assembly 120 starts to descend, the air suction inlet 121 of the smoke collecting assembly can extend out of the chassis shell and be exposed. And the suction inlet 121 of the smoke collecting assembly 120 can be communicated with the smoke collecting pipe during the lifting and lowering of the smoke collecting assembly 120. It can be seen that the smoke collecting assembly 120 with the arrangement can adjust the height of the air suction inlet 121 by adjusting the position of the smoke collecting assembly 120, so that the air suction inlet 121 can be positioned more favorable for smoke exhaust.

The driving device 130 may be connected to the smoke collecting assembly 120, and is used for driving the smoke collecting assembly 120 to lift within a lifting range. For example, the driving device 130 includes a motor and a connection rod. The driving device 130 may be connected to the smoke collecting assembly 120 through a connection rod. The connecting rod may comprise a hydraulic or pneumatic push rod or the like. The drive 130 may be controlled by the controller 150, for example by the controller 150 controlling the operation of its motor.

The first and second ranging devices 141 and 142 may be disposed at a position of the smoke collecting assembly 120 below the suction port 121 and toward the front for detecting a distance in front and generating first and second ranging signals. The first and second ranging devices 141 and 142 may include any suitable ranging sensor, such as an infrared pyroelectric sensor, an ultrasonic sensor, a radar sensor, and the like. The first ranging device 141 and the second ranging device 142 are arranged in pairs, and may be 1 pair or multiple pairs, which may be arranged according to actual requirements. For example, only the first ranging device 141 and the second ranging device 142 may be provided on a range hood used in cooperation with a range of a single burner. The first and second ranging devices 141 and 142 may be disposed in front of the smoke collecting assembly 120, for example, may be disposed outside a front wall of the smoke collecting assembly 120. The range hood can avoid damage and pollution of steam and oil smoke to the range finder during cooking to a certain extent, and the reliability and the service life of the range hood are guaranteed. Of course, the first ranging device 141 and the second ranging device 142 may be disposed at other suitable locations. The first and second ranging devices 141 and 142 are directed forward, for example, the measuring probe is directed forward, so as to detect distance information of an object located in front of the measuring probe and closest to the measuring probe, for example, the distance information of a cooking appliance located in front of the first and second ranging devices 141 and 142 may be detected.

The controller 150 may be connected to the first ranging device 141, the second ranging device 142, and the driving device 130, respectively. The controller 150 may be configured to acquire the first ranging signal and the second ranging signal generated by the first ranging device 141 and the second ranging device 142 in real time, and control the driving device 130 to drive the smoke collecting assembly 120 to lift based on the first ranging signal and the second ranging signal in real time, so that the upper edge of the cooking appliance corresponding to the smoke collecting assembly 120 is located between the first ranging device 141 and the second ranging device 142 in the vertical direction.

For example, the controller 150 may acquire the first ranging signal and the second ranging signal currently generated by the first ranging device 141 and the second ranging device 142 in real time at a preset frequency. The preset frequency is acquired once, for example, 10 milliseconds to 1 second.

It will be readily appreciated that the first and second ranging devices 141 and 142 may detect an object in front of and closest to the object in real time and may acquire distance information from the object. The first and second ranging devices 141 and 142 may be disposed on the smoke collecting assembly 120 in regions corresponding to the burner. As shown in fig. 1, may be disposed on the smoke collection assembly 120 in a position aligned with the center of the burner. Thus, the centers of the first ranging device 141, the second ranging device 142, and the burner are located in the same vertical plane. It may be determined whether a cooking appliance is currently present on the burner according to the distance information detected by the first and second distance measuring devices 141 and 142. Fig. 2a and 2b show side views of a range hood and its different working environments, respectively, according to one embodiment of the present application. Fig. 2a shows a state in which a cooking appliance is present on the burner below the current range hood. Fig. 2b shows a state where no cooking appliance is present on the burner below the current range hood. Taking the second ranging device 142 as an example, in case that a cooking appliance exists in front of the second ranging device 142, it can detect a distance d1 of the second ranging device 142 to the cooking appliance in front thereof. When there is no cooking appliance in front of it, it detects the distance d2 of the second distance measuring device 142 from the farther object in front of it. In this case, the front distant object may be a human body of a user who is cooking operation or a wall of a kitchen or the like. It is understood that d1 is less than d2. Thus, it is possible to determine whether or not a cooking appliance exists at a detection height corresponding to the distance measuring device based on the magnitude of the distance detected by the distance measuring device.

According to an embodiment of the present application, the controller 150 may compare the currently detected distances of the first and second ranging devices 141 and 142 with a preset distance, respectively, and determine whether a cooking appliance exists at the corresponding heights of the first and second ranging devices 141 and 142. Since the suction port 121, the first ranging device 141 and the second ranging device 142 are all disposed on the smoke collecting assembly 120, the positions thereof are relatively fixed. It may be determined whether the height of the suction inlet 121 on the smoke collecting assembly 120 matches the height of the cooking appliance based on a determination result regarding whether the cooking appliance is present at the corresponding heights of the first and second ranging devices 141 and 142. When the upper edge of the cooking appliance is higher than the second ranging device 142 and lower than the first ranging device 141, the height of the suction inlet 121 of the smoke collecting assembly 120 is the optimal smoke discharging height. Since the upper edge of the cooking appliance is located between the first and second ranging devices 141 and 142, the first and second ranging devices 141 and 142 can detect in time accurately regardless of any height change of the cooking appliance. The controller 150 may control the driving device 130 to drive the smoke collecting assembly 120 to ascend and descend accordingly. For example, in the process of cooking in the steamer, a layer of steamer tray is added on the top layer of the steamer, the first distance measuring device 141 can detect that the distance shown by the generated first distance measuring signal is changed from greater than the preset distance to smaller than the preset distance. At this time, the driving device 130 may be controlled to drive the smoke collecting assembly 120 to rise to an optimal smoke discharge height corresponding to the current cooking appliance. For another example, during cooking in the steamer, when a layer of steamer tray is taken off at the top layer of the steamer or the whole steamer is taken off, the second distance measuring device 142 can detect that the distance shown by the generated second distance measuring signal is changed from smaller than the preset distance to larger than the preset distance. At this time, the driving device 130 may be controlled to drive the smoke collecting assembly 120 to be lifted to an optimal smoke discharging height or a lowest possible position thereof corresponding to the current cooking appliance.

The predetermined distance may be a value stored in the controller 150 when shipped from the factory, a value input by a user or an installer when performing on-site debugging according to actual conditions, or an analog value input by a potentiometer or the like, for example. The preset distance can be taken according to the distance between the first distance measuring device 141, the second distance measuring device 142 and the cooking appliance when the cooking appliance is normally placed on the burner. The preset distance may be, for example, any value of 10 to 20 cm, for example.

The controller 150 may control the driving device 130 in various suitable ways. For example, the high-level signal controls the driving device 130 to drive the smoke collecting assembly 120 to ascend, and the low-level signal controls the driving device 130 to drive the smoke collecting assembly 120 to descend. It is also possible to control the single elevation of the smoke collecting assembly 120 by controlling the single energization time of the driving means 130. Of course, the controller 150 may also control the driving device 130 to drive the smoke collecting assembly 120 to ascend or descend through other suitable modes.

The distance between the first ranging device 141 and the second ranging device 142 may be 3-5cm. The detection ranges of the two detection ranges are prevented from being overlapped by a certain distance, so that the judgment of the upper edge of the cooking utensil is distorted, and the control result of the smoke collecting assembly 120 is affected. If the distance is set to be more than 5cm, a vacuum distance measuring position exists between the two. This results in insensitivity to the changing state of the cooking appliance, and the smoke collecting assembly 120 cannot be accurately controlled according to the change of the cooking appliance. For example, during the cooking process of the steamer, a layer of steamer tray is added on the top layer of the steamer, and the height of the steamer tray is smaller than the distance between the first distance measuring device 141 and the second distance measuring device 142. The presence of the vacuum ranging position described above results in that the first ranging device 141 does not detect although the cooking appliance is added, and thus the controller 150 cannot timely control the smoke collecting assembly 120 to reach the optimal smoke discharging position according to the ranging result.

The distance between the first distance measuring device 141 and the second distance measuring device 142 is set within the range of 3-5cm, so that the misjudgment probability of the upper edge of the cooking appliance by the controller 150 can be reduced, most cooking appliances on the market can be considered, and the height of the current cooking appliance can be more accurately determined. Therefore, the smoke collecting assembly 120 is accurately controlled in real time and always kept at the optimal smoke collecting position, and the smoke discharging effect of the range hood is further guaranteed.

It should be noted that, as used in the present application, the terms "upper", "lower", "front", "rear", "left", "right", "vertical", etc. are all relative to the user when the range hood is in use.

Because the first distance measuring device 141 and the second distance measuring device 142 which are lifted synchronously with the smoke collecting assembly 120 can acquire the distance information in front of the first distance measuring device and the second distance measuring device in real time, the state of the cooking utensil in front of the first distance measuring device can be accurately detected, and the accurate lifting control of the smoke collecting assembly 120 in the air suction range can be further realized. In particular, any change of the cooking appliance during the cooking process can be sharply detected by the first distance measuring device 141 and the second distance measuring device 142, and the smoke collecting assembly 120 can be adaptively and automatically controlled according to the change. Therefore, on the premise of ensuring the convenience of cooking operation of a user, the efficiency of the range hood is greatly improved, and further the user experience is remarkably improved.

Illustratively, the controller 150 acquires the first ranging signal and the second ranging signal in real time, including performing the following operations: the first ranging signal and the second ranging signal are acquired every preset time interval, wherein the preset time interval is greater than or equal to 250 milliseconds and less than or equal to 1500 milliseconds. In other words, the preset time may be any value within 250 milliseconds to 1500 milliseconds. For example, the preset time may take 500 milliseconds. I.e., the controller 150 acquires the first ranging signal and the second ranging signal once every 500 milliseconds. If the preset time is too short, the consumption of computing resources of the controller 150 will be significantly increased. If the preset time is too long, the change condition of the cooking utensil under the range hood is difficult to respond in time. Compared with the operating frequency of a user on the cooking utensil, the real-time performance can be ensured by acquiring the ranging signal at the frequency, and the great calculation burden is not brought.

In the above technical scheme, not only can the change of the cooking utensil be detected in real time and the lifting of the smoke collecting assembly 120 can be controlled in time according to the detected change, but also the excessive requirement on the computing capacity of the controller 150 can be avoided, thereby ensuring the lower cost of the range hood.

For example, the controller 150 may control the smoke collecting assembly 120 to automatically rise to the highest position when it is determined that the range hood is on. Optionally, the range hood includes an input device, and the controller 150 may be connected to the input device. For example, the input device is a key switch, and the controller 150 may determine that the range hood is turned on in response to a user's pressing operation of the key switch. Alternatively, the controller 150 may also determine a desired on-time, such as 12 pm per day, in response to a user setting operation of the input device. When the starting time expected by the user is reached, the starting of the range hood can be determined. The control of the smoke collecting assembly 120 to rise to the highest position during the start-up is equivalent to initializing the smoke collecting assembly 120. In one embodiment, the driving device 130 includes a stepping motor without position feedback, and the elevation of the smoke collecting assembly 120 can be controlled by controlling the running steps of the stepping motor. Inaccuracy in the location of movement of the smoke collection assembly 120 may be caused when the range hood is operated for a long period of time or a sudden unexpected power failure condition occurs. The smoke collecting assembly 120 can be lifted to the highest position to calibrate the position when the range hood is started every time. It will be appreciated that the above process is not visible to the user if the smoke collection assembly 120 has been controlled to be in the highest position when the range hood is shut down. When the engine is started, the smoke collecting assembly 120 is controlled to be lifted to the highest position, so that the accurate control of the range hood in the working process of the range hood can be ensured, the reliability of the range hood is improved, and the control logic can be simplified.

Similarly, when it is determined that the range hood is shut down, the controller 150 may control the driving device 130 to drive the smoke collecting assembly 120 to automatically rise to the highest position. At this time, the concealable portion of the smoke collecting assembly 120 may gradually conceal into the chassis housing or conceal to the back of the chassis assembly 110. Illustratively, the range hood may include an input device, and the controller 150 may be connected to the input device. For example, the input device is a key switch, and the controller 150 may determine that the range hood is turned off in response to a user's pressing operation of the key switch. Alternatively, the controller 150 may also start timing, for example, 2 hours, in response to a setting operation of the input device by the user. And when the counted time reaches the time expected by the user, the shutdown of the range hood can be determined. When it is determined that the range hood is shut down, the controller 150 may directly control the driving device 130 to drive the smoke collecting assembly 120 to rise to the highest position. On the one hand, the maximum space can be reserved for the user when the user does not use the range hood. On the other hand, the smoke collecting assembly 120 can be prevented from being exposed to the outside under the condition that the range hood is not opened, and is unnecessarily polluted, and meanwhile, the attractive appearance is also prevented. Further, the device can be lifted to the highest position, so that the damage to personnel and machines caused by accidental collision can be avoided.

As previously described, the controller 150 may be configured to control the driving device 130 to drive the smoke collecting assembly 120 according to the first ranging signal and the second ranging signal. Illustratively, first ranging device 141 is closer to chassis assembly 110 than second ranging device 142. In other words, the first ranging device 141 is located above the second ranging device 142. The controller 150 implements the above-described functions by performing the following operations.

When the distance indicated by the first ranging signal generated by the first ranging device 141 and the distance indicated by the second ranging signal generated by the second ranging device 142 are both smaller than the preset distance, the driving device 130 is controlled to drive the smoke collecting assembly 120 to ascend, and the driving device 130 is controlled to stop running until the distance indicated by the first ranging signal is larger than the preset distance.

When the distance shown by the distance measurement signal generated by any distance measurement device is smaller than the preset distance, the existence of the cooking utensil at the corresponding height in front of the distance measurement device can be determined. When the height of the smoke collecting assembly 120 relative to the cooking appliance is too low, the distance indicated by the first ranging signal and the distance indicated by the second ranging signal are both smaller than the preset distance. At this time, it may be determined that there are cooking appliances at the corresponding heights in front of the first and second ranging devices 141 and 142. Thereby, the driving device 130 can be controlled to drive the smoke collecting assembly 120 to ascend. When the distance indicated by the first ranging signal is greater than the preset distance, no cooking appliance exists at the corresponding height in front of the first ranging device 141, i.e. the height of the first ranging device 141 is higher than the height of the upper edge of the cooking appliance, and a cooking appliance exists at the corresponding height in front of the second ranging device 142.

According to the technical scheme, the upper edge of the cooking appliance is located between the first distance measuring device 141 and the second distance measuring device 142 in height, and the smoke exhaust effect of the range hood is further guaranteed; and the logic is simple, the implementation is easy and the error is not easy. In addition, when the height of the cooking appliance is increased, for example, when a new cooker is added to the upper portion of the cooking appliance, the smoke collecting assembly 120 can be timely and accurately controlled to ascend, and user experience is improved.

When the distance indicated by the first ranging signal generated by the first ranging device 141 and the distance indicated by the second ranging signal generated by the second ranging device 142 are both greater than the preset distance, the driving device 130 is controlled to drive the smoke collecting assembly 120 to descend, and the driving device 130 is controlled to stop running until the distance indicated by the second ranging signal is less than the preset distance.

As described above, when the distance indicated by the ranging signal generated by any ranging device is greater than the preset distance, it may be determined that the cooking appliance does not exist at the corresponding height in front of the ranging device, which directly measures the distance between the user's human body or the wall body.

When the distance indicated by the first ranging signal and the distance indicated by the second ranging signal are both greater than the preset distance, it may be determined that no cooking appliance exists at the corresponding heights in front of the first ranging device 141 and the second ranging device 142. In other words, the cooking appliance is lower than two distance measuring devices. Thereby, the driving device 130 may be controlled to drive the smoke collecting assembly 120 to descend. When the distance indicated by the second ranging signal is smaller than the preset distance, the cooking appliance appears at the corresponding height in front of the second ranging device 142, i.e. the height of the second ranging device 142 is lower than the height of the upper edge of the cooking appliance, and the cooking appliance does not exist at the corresponding height in front of the first ranging device 141.

According to the technical scheme, the upper edge of the cooking appliance is located between the first distance measuring device 141 and the second distance measuring device 142 in height, and the smoke exhaust effect of the range hood is further guaranteed; and the logic is simple, the implementation is easy and the error is not easy. In addition, when the height of the cooking appliance is reduced, for example, when a part of the cookware is taken out of the upper part of the cooking appliance, the smoke collecting assembly 120 can be timely and accurately controlled to descend, and the user experience is improved.

Illustratively, the range hood further includes an output device, and the controller 150 may control the output device to alarm when the distance information shown by the first ranging signal is less than a preset distance and the distance information shown by the second ranging signal is greater than the preset distance. It will be appreciated that the cooking appliance is placed on the stove head below the range hood. The cooking utensil can not appear unsettled condition. In the case of normal use of the range hood, the case where the first ranging device 141 located above detects the cooking appliance and the second ranging device 142 located below does not detect the cooking appliance does not occur. The above results may occur due to various problems occurring, such as the following: 1) When the range hood works, oil stains possibly pollute the ranging device, so that the ranging result of the ranging device is inaccurate; 2) One or both of the first ranging device 141 and the second ranging device 142 are damaged; 3) The controller 150 malfunctions. At this time, the range hood cannot accurately control the elevation position of the smoke collecting assembly 120 according to the ranging results of the first ranging device 141 and the second ranging device 142, and the controller 150 may control the output device to alarm.

In order to avoid the situation of false alarm as much as possible, according to a preferred embodiment of the present application, the output device may be controlled to alarm after the result that the distance information shown by the first ranging signal is smaller than the preset distance and the distance information shown by the second ranging signal is larger than the preset distance appears continuously for multiple times.

In the above technical solution, for the situation that the ranging signals generated based on the first ranging device 141 and the second ranging device 142 are difficult to correctly reflect the height of the cooking appliance, the alarm information is output, so that the user can be helped to learn and adjust the abnormal working condition of the range hood in time, and the range hood is prevented from working in the abnormal condition for a long time.

The range hood according to one embodiment of the present application can support the exhaust of a range of a plurality of burners. The range hood may include a plurality of fume collecting assemblies 120, and each fume collecting assembly 120 is independently provided with a fume suction port 121, and a first ranging device 141 and a second ranging device 142. Each smoke collecting assembly 120 may be provided with a separate drive means 130. In other words, the range hood includes the same number of driving devices 130 as the number of the smoke collecting components 120, and the driving devices 130 are in one-to-one correspondence with the smoke collecting components 120.

In the above technical solution, the range hood includes a plurality of smoke collecting assemblies 120 and driving devices 130 corresponding to the smoke collecting assemblies. Thus, the smoke collecting assemblies 120 corresponding to the furnace heads can be independently controlled to be at the optimal smoke discharging height, and the optimal smoke discharging effect is realized; and the control logic of the smoke collecting assembly 120 may be simplified.

Referring again to fig. 1, the center points of the horizontal projections of the first and second ranging devices 141 and 142 may be located on the longitudinal center axis of the horizontal projection of the burner. That is, the first and second ranging devices 141 and 142 may be disposed right behind the burner in the left-right direction. It is readily understood that in the case of placing a cooking appliance above a burner, the center of the cooking appliance is generally near the center of the burner. Cooking appliances are generally circular in cross-section. Thus, the distance measured by the first and second distance measuring devices 141 and 142 is the distance of the rearmost portion of the cooking appliance from it, i.e., the minimum distance from the cooking appliance. Even if there is some error in the distance measurement of the first and second distance measuring devices 141 and 142, it is possible to accurately detect if there is a cooking appliance on the oven head. In addition, in the case where the cooking appliance in front of the first and second ranging apparatuses 141 and 142 is small, the first and second ranging apparatuses 141 and 142 are disposed directly behind the burner region, so that it is possible to avoid a situation where the cooking appliance is not detected.

According to the above scheme, through setting the first ranging device 141 and the second ranging device 142 at the position close to the center of the burner and right behind, whether the cooking utensil exists can be effectively and accurately detected, and the detection error is avoided, so that the smoke collecting assembly 120 can be lifted to the most suitable height. Furthermore, the efficient use of the range hood can be realized on the premise of being convenient for a user to cook.

Illustratively, the first ranging device 141 and the second ranging device 142 may be infrared ranging devices that perform distance measurements based on reflection of infrared light. The infrared distance measuring device has low cost and mature technology, and can accurately measure the distance between the cooking utensil and the range hood in most application scenes. When a user uses a transparent cooking appliance, for example, made of glass, this may lead to a measurement error situation, since infrared rays may not be reflected at the cooking appliance. As a result, problems may arise in the control of the range hood with respect to the fume collection assembly 120.

Illustratively, the first ranging device 141 and the second ranging device 142 may be ultrasonic ranging devices. The ultrasonic ranging device may generate ultrasonic waves. Since the propagation speed of the ultrasonic wave in the air is known, the actual distance of the ultrasonic ranging device to the object in front can be calculated from the difference between the time the ultrasonic wave is transmitted and the time it is received after being reflected back against an obstacle. In an embodiment of the application, the front object is a cooking appliance, a human body, a wall or the like.

The ultrasonic distance measuring device has stable performance, lower cost, accurate measuring distance and small blind area; the accuracy of the distance information obtained by the controller 150 is ensured, and the accurate control effect of the controller 150 on the smoke collecting assembly 120 can be further ensured. The range hood with the ultrasonic distance measuring device can be suitable for various common cooking appliances in the market, is stable and reliable, and can effectively improve the use experience of users.

According to another aspect of the application, a control method suitable for the range hood is also disclosed. As previously described, the range hood includes the fume collection assembly 120, the driving device 130, the first ranging device 141, and the second ranging device 142. The control method comprises the following steps: the first ranging signal generated by the first ranging device 141 and the second ranging signal generated by the second ranging device 142 are acquired in real time. For example, the first ranging signal and the second ranging signal currently generated by the first ranging device 141 and the second ranging device 142 may be acquired once every 250ms or every 500 ms. Compared with the operation speed of a user on the cooking utensil, the detection of the frequency can ensure real-time performance, and the detection does not bring too much calculation burden. Thereafter, the driving device 130 may be controlled to drive the smoke collecting assembly 120 to ascend or descend according to the first ranging signal and the second ranging signal such that the upper edge of the cooking appliance corresponding to the smoke collecting assembly 120 is located between the first ranging device 141 and the second ranging device 142 in the vertical direction. The positions of the air suction openings 121 on the first distance measuring device 141, the second distance measuring device 142 and the smoke collecting assembly 120 are relatively fixed, and the upper edge of the cooking appliance corresponding to the smoke collecting assembly 120 is positioned between the first distance measuring device 141 and the second distance measuring device 142 in the vertical direction, so that the air suction openings 121 can be at the optimal smoke discharging height.

Illustratively, first ranging device 141 is closer to chassis assembly 110 than second ranging device 142. In other words, first ranging device 141 is above second ranging device 142.

The controlling the driving device 130 to drive the smoke collecting assembly 120 according to the first ranging signal and the second ranging signal may include: when the distance indicated by the first ranging signal and the distance indicated by the second ranging signal are both smaller than the preset distance, the driving device 130 is controlled to drive the smoke collecting assembly 120 to ascend, and when the distance indicated by the first ranging signal is larger than the preset distance, the driving device 130 is controlled to stop running, namely, the smoke collecting assembly 120 stops ascending. In other words, when the height of the smoke collecting assembly 120 with respect to the cooking appliance is excessively low, the height of the smoke collecting assembly 120 is raised so that the air suction port 121 is in place.

The controlling the driving device 130 to drive the smoke collecting assembly 120 according to the first ranging signal and the second ranging signal may further include: when the distance indicated by the first ranging signal and the distance indicated by the second ranging signal are both greater than the preset distance, the driving device 130 is controlled to drive the smoke collecting assembly 120 to descend, and when the distance indicated by the second ranging signal is smaller than the preset distance, the driving device 130 is controlled to stop running, namely the smoke collecting assembly 120 stops descending. In other words, when the height of the smoke collecting assembly 120 with respect to the cooking appliance is excessively high, the height of the smoke collecting assembly 120 is lowered so that the air suction port 121 is in place.

Illustratively, first ranging device 141 is closer to chassis assembly 110 than second ranging device 142. The control method may further include: and when the distance shown by the first ranging signal is smaller than the preset distance and the distance shown by the second ranging signal is larger than the preset distance, executing alarm operation.

Illustratively, the control method may further include: when the range hood is determined to be started and/or shut down, the driving device 130 is controlled to drive the smoke collecting assembly 120 to be lifted to the highest position.

Fig. 3 shows a schematic flow chart of a range hood control method according to an embodiment of the present application. In this range hood, the first ranging device 141 is closer to the housing assembly 110 than the second ranging device 142. As shown in fig. 3, after the range hood is turned on, the first ranging device 141, the second ranging device 142, and the controller 150 may be activated. The controller 150 first controls the driving device 130 to drive the smoke collecting assembly 120 to rise to the highest position. The first ranging signal generated by the first ranging device 141 and the second ranging signal generated by the second ranging device 142 may then be read in real time to determine the corresponding distance information. For convenience of description, distances indicated by the first ranging signal and the second ranging signal are denoted as Ls and Lx, respectively, and the above-mentioned preset distance is denoted as L0. The controller 150 may acquire the first ranging signal and the second ranging signal every interval for a preset time. Specifically, the controller 150 may start a timer to count when the smoke collecting assembly 120 reaches the highest position, the counted time being denoted T. When the counted time T is every accumulated preset time, for example, 500 milliseconds, a first ranging signal and a second ranging signal are acquired, the counted time of the timer is cleared and the timing is restarted, so that the real-time reading function is realized. According to Ls and Lx, the driving device 130 is controlled to drive the smoke collecting assembly 120 such that the upper edge of the corresponding cooking appliance of the smoke collecting assembly 120 is located between the first ranging device 141 and the second ranging device 142 in the vertical direction.

The control method may further include performing an alarm operation when the distance indicated by the first ranging signal is less than a preset distance and the distance indicated by the second ranging signal is greater than the preset distance. As shown in fig. 3, if Lx > L0 and Ls < L0, indicating that the state of the range hood is abnormal, the controller 150 may control the output device to issue a false alarm. If Lx > L0 and Ls is greater than or equal to L0, the controller 150 may control the driving device 130 to drive the smoke collecting assembly 120 to descend. Alternatively, if Lx > L0 and ls+.L0, and the collector assembly 120 is at the lowest position, the drive 130 may be controlled to cease operation. If Lx < L0 and ls.ltoreq.L0, the controller 150 may control the driving device 130 to drive the smoke collecting assembly 120 to ascend. Alternatively, if Lx < L0 and ls+.L0, and the collector assembly 120 is in the highest position, the drive 130 may be controlled to cease operation. If Lx < L0 and Ls > L0, the controller 150 may control the driving device 130 to stop operating.

It can be understood that at any time in the working process of the range hood, the shutdown of the range hood can be determined, for example, a shutdown indication signal of a user is received. At this time, the controller 150 may control the driving device 130 to drive the smoke collecting assembly 120 to rise to the highest position, regardless of whether Lx and Ls are arbitrary values at this time. This shutdown flow is not shown in fig. 3.

Those skilled in the art can understand the steps and technical effects of the control method of the range hood by reading the above related descriptions about the range hood, and for brevity, the description is omitted herein.

Spatially relative terms, such as "above … …," "above … …," "on top of … …," "above," and the like, may be used herein for ease of description to describe one or more components or features' spatial positional relationships to other components or features as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass not only the orientation of the elements in the figures but also different orientations in use or operation. For example, if the element in the figures is turned over entirely, elements "over" or "on" other elements or features would then be included in cases where the element is "under" or "beneath" the other elements or features. Thus, the exemplary term "above … …" may include both orientations "above … …" and "below … …". Moreover, these components or features may also be positioned at other different angles (e.g., rotated 90 degrees or other angles), and all such cases are intended to be encompassed herein.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, components, assemblies, and/or combinations thereof.

It should be noted that the terms "first," "second," and the like in the description and the claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that embodiments of the application described herein may be implemented in sequences other than those illustrated or otherwise described herein.

The present invention has been illustrated by the above-described embodiments, but it should be understood that the above-described embodiments are for purposes of illustration and description only and are not intended to limit the invention to the embodiments described. In addition, it will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that many variations and modifications are possible in light of the teachings of the invention, which variations and modifications are within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (15)

1. The range hood is characterized by comprising a case assembly, a smoke collecting assembly, a driving device, a first distance measuring device, a second distance measuring device and a controller, wherein,

The smoke collecting assembly is connected with the case assembly in a lifting manner, and an air suction port is arranged on the smoke collecting assembly;

the driving device is connected with the smoke collecting assembly and used for driving the smoke collecting assembly to lift;

The first distance measuring device and the second distance measuring device are distributed up and down, are arranged on the smoke collecting assembly and face forward, and are used for detecting the distance and respectively generating a first distance measuring signal and a second distance measuring signal;

the controller is connected with the driving device, the first distance measuring device and the second distance measuring device, and is used for acquiring the first distance measuring signal and the second distance measuring signal in real time, controlling the driving device to drive the smoke collecting assembly according to the first distance measuring signal and the second distance measuring signal, so that the upper edge of the cooking appliance corresponding to the smoke collecting assembly is located between the first distance measuring device and the second distance measuring device in the vertical direction.

2. The range hood of claim 1, wherein the first range unit is closer to the housing assembly than the second range unit,

The controller controls the driving device to drive the smoke collecting assembly according to the first ranging signal and the second ranging signal, and the controller comprises the following operations:

When the distance shown by the first ranging signal and the distance shown by the second ranging signal are smaller than the preset distance, the driving device is controlled to drive the smoke collecting assembly to ascend until the distance shown by the first ranging signal is larger than the preset distance, and the driving device is controlled to stop running.

3. The range hood of claim 1, wherein the first range unit is closer to the housing assembly than the second range unit,

The controller controls the driving device to drive the smoke collecting assembly according to the first ranging signal and the second ranging signal, and the controller comprises the following operations:

when the distance shown by the first ranging signal and the distance shown by the second ranging signal are both larger than a preset distance, the driving device is controlled to drive the smoke collecting assembly to descend, and the driving device is controlled to stop running until the distance shown by the second ranging signal is smaller than the preset distance.

4. A range hood according to any one of claims 1-3, wherein said first distance measuring device is closer to said housing assembly than said second distance measuring device, said range hood further comprising an output device,

The controller is further used for controlling the output device to alarm when the distance shown by the first ranging signal is smaller than a preset distance and the distance shown by the second ranging signal is larger than the preset distance.

5. A range hood according to any one of claims 1 to 3 wherein the controller is further adapted to control the drive means to drive the smoke collection assembly up to a highest position when it is determined that the range hood is on and/or off.

6. A range hood according to any one of claims 1 to 3, wherein the number of said driving means is the same as the number of said driving means, said driving means driving said fume collecting means one-to-one, each fume collecting means being provided with a first distance measuring means and a second distance measuring means.

7. A range hood according to any one of claims 1-3, wherein the centre points of the horizontal projections of the first and second distance measuring devices are located on the longitudinal centre axis of the horizontal projection of the burner.

8. A range hood according to any one of claims 1-3, wherein the distance between the first distance measuring device and the second distance measuring device is 3 to 5 cm.

9. A range hood according to any one of claims 1-3, wherein the first distance measuring device and the second distance measuring device are ultrasonic distance measuring devices.

10. The range hood of any one of claims 1-3 wherein the controller acquiring the first ranging signal and the second ranging signal in real time comprises:

The first ranging signal and the second ranging signal are acquired every predetermined time interval, wherein the predetermined time is greater than or equal to 250 milliseconds and less than or equal to 1500 milliseconds.

11. A range hood control method, characterized in that the range hood comprises: the device comprises a case assembly, a smoke collecting assembly, a driving device, a first distance measuring device and a second distance measuring device, wherein the smoke collecting assembly is connected with the case assembly in a lifting manner, and an air suction port is arranged on the smoke collecting assembly; the driving device is connected with the smoke collecting assembly and used for driving the smoke collecting assembly to lift; the first distance measuring device and the second distance measuring device are distributed up and down, are arranged on the smoke collecting assembly and face forward, and are used for detecting the distance and respectively generating a first distance measuring signal and a second distance measuring signal;

The control method comprises the following steps: the method comprises the steps of acquiring a first ranging signal and a second ranging signal in real time, and controlling the driving device to drive the smoke collecting assembly according to the first ranging signal and the second ranging signal so that the upper edge of a cooking appliance corresponding to the smoke collecting assembly is located between the first ranging device and the second ranging device in the vertical direction.

12. The control method of claim 11, wherein the first ranging device is closer to the chassis assembly than the second ranging device,

The control of the driving device to drive the smoke collecting assembly according to the first ranging signal and the second ranging signal comprises:

When the distance shown by the first ranging signal and the distance shown by the second ranging signal are smaller than the preset distance, the driving device is controlled to drive the smoke collecting assembly to ascend until the distance shown by the first ranging signal is larger than the preset distance, and the driving device is controlled to stop running.

13. The control method of claim 11, wherein the first ranging device is closer to the chassis assembly than the second ranging device,

The control of the driving device to drive the smoke collecting assembly according to the first ranging signal and the second ranging signal comprises:

when the distance shown by the first ranging signal and the distance shown by the second ranging signal are both larger than a preset distance, the driving device is controlled to drive the smoke collecting assembly to descend, and the driving device is controlled to stop running until the distance shown by the second ranging signal is smaller than the preset distance.

14. The control method of any of claims 11 to 13, wherein the first ranging device is closer to the chassis assembly than the second ranging device, the control method further comprising:

And when the distance shown by the first ranging signal is smaller than a preset distance and the distance shown by the second ranging signal is larger than the preset distance, executing alarm operation.

15. The control method according to any one of claims 11 to 13, characterized in that the control method further comprises:

and when the starting and/or the shutdown of the range hood are determined, controlling the driving device to drive the smoke collecting assembly to rise to the highest position.