Range hood and fan system and control method thereof

Abstract

The invention provides an improved draught fan system of a smoke exhaust ventilator, the smoke exhaust ventilator and a control method of the smoke exhaust ventilator. The invention provides a fan system of a range hood. The fan system comprises a first centrifugal fan and a second centrifugal fan, an air inlet and an air outlet of the first centrifugal fan are arranged to be suitable for opening and closing switching; an air inlet and an air outlet of the second centrifugal fan are arranged to be suitable for opening and closing switching; a first through hole is formed in the wall body of a volute of the first centrifugal fan and is set to be suitable for opening and closing switching; a second through hole is formed in the wall body of a volute of the second centrifugal fan and is set to be suitable for opening and closing switching; when the first through hole and the second through hole are both opened, the volute of the first centrifugal fan is communicated with the volute of the second centrifugal fan; the fan system is set to be suitable for being switched between a first working mode and a second working mode. Therefore, the fan system adopting a brand new double-centrifugal-fan series connection scheme is provided.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of range hood. BACKGROUND

[0002] In the Asian region, due to the traditional cooking habit of stir-frying, the oil content in the smoke generated during cooking is particularly high. Therefore, the range hood for extracting and exhausting the oil smoke generated during cooking has become an important household appliance indispensable to daily life. With the continuous improvement of people's requirements for the quality of life, the range hood is also constantly upgrading and improving. For example, at present, two centrifugal fans in series have been proposed in the range hood field to jointly extract and exhaust oil smoke. However, the existing two centrifugal fan series schemes are all one centrifugal fan air outlet connected to the air inlet of another centrifugal fan, the scheme is single, and has become a habit.

[0003] Unless sufficient evidence is provided, the prior art described herein does not mean that these prior arts are admitted to be known to those skilled in the art related to the present application before the filing date of the present application. SUMMARY

[0004] One purpose of the embodiments of the present application is to propose an improved fan system of range hood, range hood and control method of range hood, aiming at at least one of the above technical problems and / or other possible technical problems not mentioned in the present application.

[0005] According to a first aspect of the present application, embodiments of the present application provide a fan system of a range hood, comprising a first centrifugal fan and a second centrifugal fan; an air inlet and an air outlet of the first centrifugal fan are both configured to be switched between opening and closing; an air inlet and an air outlet of the second centrifugal fan are both configured to be switched between opening and closing; a wall of a volute of the first centrifugal fan is provided with a first through hole configured to be switched between opening and closing; a wall of a volute of the second centrifugal fan is provided with a second through hole configured to be switched between opening and closing; when the first through hole and the second through hole are both open, the volute of the first centrifugal fan and the volute of the second centrifugal fan are in communication; the fan system is configured to be switched between a first working mode and a second working mode; when the fan system is in the first working mode, the air inlet and the air outlet of the first centrifugal fan are both open, the air inlet and the air outlet of the second centrifugal fan are both open, the first through hole and the second through hole are both closed, and the first centrifugal fan and the second centrifugal fan are configured to operate independently in parallel to respectively extract and exhaust oil fume; when the fan system is in the second working mode, the air inlet of the first centrifugal fan is open, the air outlet of the first centrifugal fan is closed, the air inlet of the second centrifugal fan is closed, the air outlet of the second centrifugal fan is open, the first through hole and the second through hole are both open, and the first centrifugal fan and the second centrifugal fan are configured to operate in series to jointly extract and exhaust oil fume. Thus, the conventional double centrifugal fan series scheme is broken through, and a fan system adopting a brand-new double centrifugal fan series scheme is proposed.

[0006] In one or some embodiments, a first closing device is included and configured to selectively close the air inlet of the first centrifugal fan or the air inlet of the second centrifugal fan; and / or

[0007] A second closing device is included and configured to selectively close the air outlet of the first centrifugal fan or the air outlet of the second centrifugal fan; and / or

[0008] The volute of the first centrifugal fan and the volute of the second centrifugal fan are in abutment, and the first through hole and the second through hole are the same through hole; and / or

[0009] The volute of the first centrifugal fan and the volute of the second centrifugal fan are spaced apart by a distance, and a gas flow channel having two ends penetrating through the first through hole and the second through hole is connected between the volute of the first centrifugal fan and the volute of the second centrifugal fan; and / or

[0010] The first centrifugal fan and the second centrifugal fan are both single-sided air inlet centrifugal fans; and / or

[0011] The air inlet of the first centrifugal fan and the air inlet of the second centrifugal fan are both configured to be switched between opening and closing through an iris diaphragm structure; and / or

[0012] The air outlet of the first centrifugal fan and the air outlet of the second centrifugal fan are configured to be switched by the iris diaphragm structure.

[0013] In one or some embodiments, a first closing device is configured to selectively close the air inlet of the first centrifugal fan or the air inlet of the second centrifugal fan; the first centrifugal fan and the second centrifugal fan are single-side air inlet centrifugal fans; the air inlet of the first centrifugal fan and the air inlet of the second centrifugal fan are both open to the front or both open to the back. The first centrifugal fan and the second centrifugal fan are single-side air inlet centrifugal fans, which helps to simplify the structure of the first closing device and facilitate the design of the air flow path.

[0014] In one or some embodiments, a first closing device is configured to selectively close the air inlet of the first centrifugal fan or the air inlet of the second centrifugal fan; when the fan system is in the first working mode, the first closing device is located between the air inlet of the first centrifugal fan and the air inlet of the second centrifugal fan.

[0015] In one or some embodiments, a second closing device is configured to selectively close the air outlet of the first centrifugal fan or the air outlet of the second centrifugal fan; when the fan system is in the first working mode, the second closing device is located between the air outlet of the first centrifugal fan and the air outlet of the second centrifugal fan.

[0016] In one or some embodiments, the volute of the first centrifugal fan and the volute of the second centrifugal fan are symmetrically arranged relative to a vertical plane; the volute tongues of the volutes of the first centrifugal fan and the second centrifugal fan are arranged opposite to each other.

[0017] In one or some embodiments, the first through hole is configured to be switched by an arc-shaped sliding panel structure or a roller shutter structure; the second through hole is configured to be switched by an arc-shaped sliding panel structure or a roller shutter structure. The arc-shaped sliding panel structure or the roller shutter structure is used to switch the opening and closing, which helps to maintain the shape of the volute without affecting the realization of its function.

[0018] In one or some embodiments, the first centrifugal fan and the second centrifugal fan are arranged in sequence from left to right or from right to left.

[0019] According to a second aspect of the present application, embodiments of the present application provide an extractor hood, comprising the fan system according to any one of the above.

[0020] According to a third aspect of the present application, embodiments of the present application provide a control method of the range hood as described above, comprising:

[0021] detecting the wind resistance;

[0022] if the detected wind resistance value is lower than the preset threshold value, controlling the fan system to operate in the first working mode;

[0023] if the detected wind resistance value is higher than the preset threshold value, controlling the fan system to operate in the second working mode.

[0024] In one or some embodiments, the first centrifugal fan and the second centrifugal fan of the range hood correspond to two burners of a lower cooking bench, comprising:

[0025] when the burner corresponding to the first centrifugal fan is in a burning state and the other burner is in a non-burning state, controlling the fan system to operate in the second working mode.

[0026] when the burner corresponding to the first centrifugal fan is in a burning state and the other burner is in a non-burning state, controlling the fan system to operate in the second working mode. In this way, focusing on the oil fume generated by the burner in the burning state helps to improve the oil fume extraction effect.

[0027] It should be noted here that the "from left to right", "from right to left", "lower", "open front", "open back" and other directional expressions appearing in the present application are based on the normal use state of the range hood unless otherwise specified.

[0028] It should be noted here that the "first", "second", "third", "fourth" appearing in the specification are for descriptive purposes only and do not indicate relative importance; moreover, they do not limit the number of features defined thereby; in addition, they also do not limit the logical relationship or order relationship of the features defined thereby.

[0029] The above summary of the present application is not intended to describe all possible embodiments of the present application. Throughout the application, guidance is provided by listing examples, which can be used in various possible combinations.

BRIEF DESCRIPTION OF DRAWINGS

[0030] The following drawings are only illustrative and explanatory of the present application and do not limit the scope of the present application, wherein:

[0031] Figure 1 is a structural schematic diagram of a fan system embodiment of a range hood of the present application in the first working mode;

[0032] Figure 2 is Figure 1 a top view of the fan system embodiment shown in

[0033] Figure 3 is Figure 1 a left view of the fan system embodiment shown in

[0034] Figure 4 is a sectional view along line A-A in Figure 3

[0035] Figure 5 is a schematic view of a fan system embodiment of an extractor hood according to the application in a second operating mode;

[0036] Figure 6 is Figure 5 a top view of the fan system embodiment shown in

[0037] Figure 7 is a schematic view of a fan system embodiment of another extractor hood according to the application in a second operating mode;

[0038] Figure 8 is Figure 7 a top view of the fan system embodiment shown in

[0039] Reference signs:

[0040] 1 - first centrifugal fan, 2 - second centrifugal fan, 3 - air inlet, 4 - air outlet, 5 - volute, 6 - volute tongue, 7 - multi-blade centrifugal impeller, 8 - first closure device, 9 - second closure device, 10 - adapter piece.

DETAILED DESCRIPTION

[0041] In order to make the technical problems to be solved by the application, the technical solutions and the beneficial technical effects clearer, the application will be further described in detail below in conjunction with the drawings and multiple exemplary embodiments. It should be understood that the specific embodiments described herein are only used to explain the application, but not to limit the protection scope of the application, and each embodiment can share the same view or multiple views described, but all the features appearing in the same view should not be interpreted as an embodiment necessarily having the features. On the contrary, they can be combined in any suitable manner as long as they are not technically mutually exclusive. Moreover, for the sake of brevity, different embodiments of different aspects can be presented in the same specific design, however, such presentation does not mean that the embodiments of these aspects should appear together. All possible disassembling and / or combinations of embodiments and / or technical features should also consider the description in the specification and what can be directly and unambiguously determined by those skilled in the art based on the description in the specification.

[0042] ​An embodiment of a fan system of a range hood is provided, which comprises a first centrifugal fan 1 and a second centrifugal fan 2, as shown in Figures 1 to 6 The first centrifugal fan 1 and the second centrifugal fan 2 are arranged in sequence from left to right. The air inlet 3 and the air outlet 4 of the first centrifugal fan 1 are both arranged to be suitable for switching between opening and closing. In other words, the air inlet 3 of the first centrifugal fan 1 is arranged to be suitable for switching between opening and closing, and the air outlet 4 of the first centrifugal fan 1 is arranged to be suitable for switching between opening and closing. The air inlet 3 and the air outlet 4 of the second centrifugal fan 2 are both arranged to be suitable for switching between opening and closing. In other words, the air inlet 3 of the second centrifugal fan 2 is arranged to be suitable for switching between opening and closing, and the air outlet 4 of the second centrifugal fan 2 is arranged to be suitable for switching between opening and closing.

[0043] The first centrifugal fan 1 and the second centrifugal fan 2 each comprise a volute 5, a multi-blade centrifugal impeller 7, and a motor. The multi-blade centrifugal impeller 7 and the motor are arranged in the corresponding volute 5. The motor is arranged to drive the corresponding multi-blade centrifugal impeller 7 to rotate.

[0044] The wall of the volute 5 of the first centrifugal fan 1 is provided with a first through hole arranged to be suitable for switching between opening and closing. In other words, the first through hole is arranged to be suitable for switching between opening and closing. The wall of the volute 5 of the second centrifugal fan 2 is provided with a second through hole arranged to be suitable for switching between opening and closing. In other words, the second through hole is arranged to be suitable for switching between opening and closing. When the first through hole and the second through hole are both open, the volute 5 of the first centrifugal fan 1 and the volute 5 of the second centrifugal fan 2 are in communication.

[0045] The fan system is arranged to be suitable for switching between a first working mode and a second working mode. When the fan system is in the first working mode, the air inlet 3 and the air outlet 4 of the first centrifugal fan 1 are both open, the air inlet 3 and the air outlet 4 of the second centrifugal fan 2 are both open, the first through hole and the second through hole are both closed, and the first centrifugal fan 1 and the second centrifugal fan 2 are suitable for operating independently in parallel to respectively extract and exhaust oil fume, as shown in Figures 1 to 4 .

[0046] When the fan system is in the second working mode, the air inlet 3 of the first centrifugal fan 1 is open, the air outlet 4 of the first centrifugal fan 1 is closed, the air inlet 3 of the second centrifugal fan 2 is closed, the air outlet 4 of the second centrifugal fan 2 is open, the first through hole and the second through hole are both open, and the first centrifugal fan 1 and the second centrifugal fan 2 are suitable for operating in series to jointly extract and exhaust oil fume, as shown in Figure 5 and 6 .

[0047] When the fan system operates in the second working mode, the airflow enters the first centrifugal fan 1 through the air inlet 3. The airflow undergoes its first acceleration within the first centrifugal fan 1, then flows through the first and second through holes, and then enters the second centrifugal fan 2. The airflow undergoes its second acceleration within the second centrifugal fan 2, and then flows out through the air outlet 4 of the second centrifugal fan 2, entering the exhaust pipe and then the common flue. Thus, the airflow, accelerated by the first centrifugal fan 1 and the second centrifugal fan 2, obtains high static pressure energy. The range hood's fan system can achieve high efficiency under low flow and high static pressure conditions, thereby achieving low power consumption and low noise performance.

[0048] The first centrifugal fan 1 and the second centrifugal fan 2 are both single-sided inlet centrifugal fans. The air inlet 3 of the first centrifugal fan 1 and the air inlet 3 of the second centrifugal fan 2 are both open and face forward.

[0049] The fan system includes a first sealing device 8. The first sealing device 8 is configured to selectively close either the air inlet 3 of the first centrifugal fan 1 or the air inlet 3 of the second centrifugal fan 2. Specifically, the first sealing device 8 can only close one of the air inlets 3 of the first centrifugal fan 1 and the air inlets 3 of the second centrifugal fan 2, or it can leave neither closed.

[0050] When the fan system is in the first operating mode, the first sealing device 8 is located between the air inlet 3 of the first centrifugal fan 1 and the air inlet 3 of the second centrifugal fan 2, such as Figure 1 As shown. It should be noted that... Figure 1 This is only a schematic diagram; the specific drive structure corresponding to the first sealing device 8 is not shown in the diagram. Specifically, the first sealing device 8 is a circular first baffle. The first baffle is configured to move linearly under the drive of the first drive device. When the first drive device moves the first baffle to the leftmost end, the first baffle closes the air inlet 3 of the first centrifugal fan 1. When the first drive device moves the first baffle to the rightmost end, the first baffle closes the air inlet 3 of the second centrifugal fan 2, as shown below. Figure 5 As shown. When the first drive device moves the first baffle to the middle position, the first sealing device 8 is located between the air inlet 3 of the first centrifugal fan 1 and the air inlet 3 of the second centrifugal fan 2, as shown. Figure 1 As shown.

[0051] The fan system includes a second sealing device 9. The second sealing device 9 is configured to selectively close either the air outlet 4 of the first centrifugal fan 1 or the air outlet 4 of the second centrifugal fan 2. Specifically, the second sealing device 9 can only close one of the air outlet 4 of the first centrifugal fan 1 and the air outlet 4 of the second centrifugal fan 2, or it can leave both unclosed.

[0052] When the fan system is in the first operating mode, the second sealing device 9 is located between the air outlet 4 of the first centrifugal fan 1 and the air outlet 4 of the second centrifugal fan 2, such as... Figure 1 and 2 As shown. When the fan system is in the second operating mode, the second sealing device 9 closes the air outlet 4 of the first centrifugal fan 1, and the air outlet 4 of the second centrifugal fan 2 opens, as shown. Figure 5 and 6 As shown. It should be noted that... Figure 1 , 2 Figures 5 and 6 are merely schematic diagrams; the specific drive structure corresponding to the second sealing device 9 is not shown in the diagram. Specifically, the second sealing device 9 is a circular second baffle. The second baffle is configured to move linearly under the drive of the second drive device. The air outlet 4 of the first centrifugal fan 1 is in the shape of a circular tube, and its tube wall is provided with through holes, such as... Figure 1 As shown, the second baffle is configured to pass through the through hole and be inserted into the pipe wall under the drive of the second drive device to seal the air outlet 4 of the first centrifugal fan 1. The air outlet 4 of the second centrifugal fan 2 is cylindrical, and its pipe wall is provided with through holes, such as... Figure 1 As shown, the second baffle is configured to pass through the through hole and be inserted into the pipe wall under the drive of the second drive device to seal the air outlet 4 of the second centrifugal fan 2. When the second drive device moves the second baffle to the leftmost end, the second baffle seals the air outlet 4 of the first centrifugal fan 1, as shown. Figure 5 and 6 As shown. When the second drive device moves the second baffle to the rightmost end, the second baffle closes the air outlet 4 of the second centrifugal fan 2. When the second drive device moves the second baffle to the middle position, the second sealing device 9 is located between the air outlet 4 of the first centrifugal fan 1 and the air outlet 4 of the second centrifugal fan 2, as shown. Figure 1 and 2 As shown.

[0053] The volute 5 of the first centrifugal fan 1 and the volute 5 of the second centrifugal fan 2 are spaced a certain distance apart, and are connected by an airflow channel with one end penetrating a first through hole and the other end penetrating a second through hole. In other words, one end of the airflow channel is connected to the first through hole, and the other end is connected to the second through hole. Specifically, a connecting piece 10 connects the volute 5 of the first centrifugal fan 1 and the volute 5 of the second centrifugal fan 2, such as... Figure 1 , 4 As shown in Figure 5, the airflow channel is located within the connector 10.

[0054] The fan system includes a Y-shaped duct. The Y-shaped duct includes a first port, a second port, and a third port that are interconnected. The outlet 4 of the first centrifugal fan 1 is connected to the first port. The outlet 4 of the second centrifugal fan 2 is connected to the second port. The third port is connected to one end of the exhaust pipe. The other end of the exhaust pipe is connected to a common flue. When the fan system is in its first operating mode, airflow enters the Y-shaped duct from the first and second ports, then exits from the third port and enters the exhaust pipe, before flowing into the common flue.

[0055] The volute 5 of the first centrifugal fan 1 and the volute 5 of the second centrifugal fan 2 are arranged symmetrically with respect to a vertical plane. The volute tongue 6 of the volute 5 of the first centrifugal fan 1 and the volute tongue 6 of the volute 5 of the second centrifugal fan 2 are arranged opposite to each other, as shown below. Figure 1 , 4 As shown in Figure 5, when the fan system operates in the second working mode, with the first centrifugal fan 1 and the second centrifugal fan 2 operating in series to jointly extract oil fumes, the oil fume extraction efficiency is high and the noise is low.

[0056] The volute 5 of the first centrifugal fan 1 includes a first front wall, a first rear wall, and a first annular wall. The first annular wall is connected between the first front wall and the first rear wall. A first through hole is provided in the first annular wall. The first through hole is configured to be opened and closed via an arc-shaped sliding panel structure; in other words, the first through hole is configured to be switched between open and closed states via the arc-shaped sliding panel structure. Specifically, a third driving device is provided. The third driving device is configured to drive the corresponding arc-shaped sliding panel structure to slide along the first annular wall to switch the opening and closing of the first through hole.

[0057] The volute 5 of the second centrifugal fan 2 includes a second front wall, a second rear wall, and a second annular wall. The second annular wall is connected between the second front wall and the second rear wall. A second through hole is provided in the second annular wall. The second through hole is configured to be opened and closed via an arc-shaped sliding panel structure; in other words, the second through hole is configured to be switched between open and closed states via the arc-shaped sliding panel structure. Specifically, a fourth driving device is provided. The fourth driving device is configured to drive the corresponding arc-shaped sliding panel structure to slide along the second annular wall to switch the opening and closing of the second through hole. Preferably, the third and fourth driving devices share the same motor, thereby reducing space occupation and manufacturing costs.

[0058] In another embodiment of the fan system of a range hood, as exemplified, the volute 5 of the first centrifugal fan 1 and the volute 5 of the second centrifugal fan 2 are attached together, and the first through hole and the second through hole are the same through hole. This embodiment focuses on illustrating the differences from the above embodiments; for the same or similar parts of this embodiment, please refer to the above embodiments.

[0059] Exemplary, in another embodiment of the fan system of a range hood, the first centrifugal fan 1 and the second centrifugal fan 2 are both single-sided air-inlet centrifugal fans. The air inlet 3 of both the first centrifugal fan 1 and the second centrifugal fan 2 are open and face rearward. This embodiment focuses on illustrating the differences from the above embodiments; similar or identical parts of this embodiment can be referred to in the above embodiments.

[0060] By way of example, in another embodiment of the fan system of a range hood, a first centrifugal fan 1 and a second centrifugal fan 2 are arranged sequentially from right to left. A schematic diagram of the structure of this range hood's fan system embodiment in its second operating mode is shown below. Figure 7 and 8 As shown. This embodiment focuses on illustrating the differences from the above embodiments; for the same or similar parts of this embodiment, please refer to the above embodiments.

[0061] Exemplary, in another embodiment of the fan system of a range hood, the first through-hole is configured to be switched on and off via a roller shutter structure. The second through-hole is also configured to be switched on and off via a roller shutter structure. Preferably, the roller shutter structures corresponding to the first and second through-holes are driven by the same motor, thereby reducing space occupation and manufacturing costs. This embodiment focuses on illustrating the differences from the above embodiments; similar or identical parts of this embodiment can be referred to in the above embodiments.

[0062] In another embodiment of the fan system of a range hood, the air inlet 3 of the first centrifugal fan 1 is configured to open and close via an iris aperture structure. This embodiment focuses on the differences from the above embodiments; similar or identical parts can be referred to in the above embodiments.

[0063] In another embodiment of the fan system of a range hood, the air inlet 3 of the second centrifugal fan 2 is configured to open and close via an iris aperture structure. This embodiment focuses on the differences from the above embodiments; similar or identical parts can be found in the above embodiments.

[0064] In another embodiment of the fan system of a range hood, the air outlet 4 of the first centrifugal fan 1 is configured to open and close via an iris aperture structure. This embodiment focuses on the differences from the above embodiments; similar or identical parts can be found in the above embodiments.

[0065] In another embodiment of the fan system of a range hood, the air outlet 4 of the second centrifugal fan 2 is configured to open and close via an iris aperture structure. This embodiment focuses on the differences from the above embodiments; similar or identical parts can be found in the above embodiments.

[0066] This application also proposes an embodiment of a range hood, including a housing and the aforementioned fan system embodiment. The aforementioned fan system embodiment is disposed within the housing.

[0067] This application also proposes an embodiment of a control method for the above-described range hood embodiments. This control method embodiment includes:

[0068] Detect air resistance;

[0069] If the detected wind resistance value is lower than the preset threshold, the fan system is controlled to operate in the first working mode.

[0070] If the detected wind resistance value is higher than the preset threshold, the fan system will be controlled to operate in the second working mode.

[0071] If the detected wind resistance value is lower than the preset threshold, this working condition generally corresponds to users on the upper floors of high-rise residential buildings. At this time, the control fan system is operated in the first working mode, and the first centrifugal fan 1 and the second centrifugal fan 2 operate in parallel and independently to extract oil fumes, which can meet the user's needs.

[0072] If the detected wind resistance value is higher than the preset threshold, this operating condition generally corresponds to lower-floor users in high-rise residential buildings. In this case, the fan system is controlled to operate in the second working mode, with the first centrifugal fan 1 and the second centrifugal fan 2 operating in series to jointly extract fumes. When the fan system is operating in the second working mode, the airflow enters the first centrifugal fan 1 through the air inlet 3, undergoes its first acceleration within the first centrifugal fan 1, then flows through the first and second through holes, and then enters the second centrifugal fan 2. The airflow undergoes its second acceleration within the second centrifugal fan 2, and then flows out through the air outlet 4 of the second centrifugal fan 2, entering the exhaust pipe and then the common flue. Thus, the airflow, accelerated by the first centrifugal fan 1 and the second centrifugal fan 2, obtains high static pressure energy. The fan system of the range hood can achieve high efficiency under low flow and high static pressure conditions, thereby achieving low power consumption and low noise performance.

[0073] The first centrifugal fan 1 and the second centrifugal fan 2 of the range hood correspond to the two burners on the stove below, with the first centrifugal fan 1 located directly above the corresponding burner and the second centrifugal fan 2 located directly above the corresponding burner. An embodiment of the control method for this range hood includes:

[0074] When the burner corresponding to the first centrifugal fan 1 is in combustion mode and the other burner is in non-combustion mode, the control fan system operates in the second working mode.

[0075] It should be noted here that the term "burner" should be interpreted broadly, encompassing both open-flame and non-open-flame stoves such as induction cooktops. Correspondingly, when a non-open-flame stove is in a combustion state, it should be understood that the non-open-flame stove is in a working state for cooking.

[0076] The control method embodiment for the range hood also includes:

[0077] When the burner corresponding to the second centrifugal fan 2 is in combustion mode and the other burner is in non-combustion mode, the control fan system operates in the third working mode.

[0078] When the fan system is in the third working mode, the air inlet 3 of the second centrifugal fan 2 is open, the air outlet 4 of the second centrifugal fan 2 is closed, the air inlet 3 of the first centrifugal fan 1 is closed, the air outlet 4 of the first centrifugal fan 1 is open, and both the first and second through holes are open. The second centrifugal fan 2 and the first centrifugal fan 1 are suitable for operating in series to jointly extract oil fumes. When the fan system is operating in the third working mode, the airflow flows into the second centrifugal fan 2 from the air inlet 3 of the second centrifugal fan 2. The airflow undergoes its first acceleration in the second centrifugal fan 2, then flows through the second and first through holes, and then flows into the first centrifugal fan 1. The airflow undergoes its second acceleration in the first centrifugal fan 1, and then flows out from the air outlet 4 of the first centrifugal fan 1, is discharged into the exhaust pipe, and then into the common flue. Thus, the airflow is accelerated by the second centrifugal fan 2 and the first centrifugal fan 1, and obtains high static pressure energy. The fan system of the range hood can achieve high efficiency under low flow and high static pressure conditions, thereby achieving low power consumption and low noise performance.

[0079] When the burner corresponding to the first centrifugal fan 1 is in combustion mode and the other burner is in non-combustion mode, the fan system is controlled to operate in the second working mode; when the burner corresponding to the second centrifugal fan 2 is in combustion mode and the other burner is in non-combustion mode, the fan system is controlled to operate in the third working mode. This focuses on extracting the fumes generated by the burner in combustion mode, thus improving the fume extraction efficiency.

[0080] Although specific embodiments have been described above, these embodiments are not intended to limit the scope of this application, even when only a single embodiment is described with respect to a particular feature. The feature examples provided in this application are intended to be illustrative and not limiting, unless explicitly stated otherwise. In practice, multiple features can be combined with each other where technically feasible and according to actual needs. Various substitutions, modifications, and alterations are also conceived without departing from the spirit and scope of this application.

Claims

1. A fan system for a range hood, characterized in that: Includes a first centrifugal fan (1) and a second centrifugal fan (2); The air inlet (3) and air outlet (4) of the first centrifugal fan (1) are both configured to be switched on and off. The air inlet (3) and air outlet (4) of the second centrifugal fan (2) are both configured to be suitable for opening and closing switching; The volute (5) wall of the first centrifugal fan (1) is provided with a first through hole, which is configured to be suitable for opening and closing switching; The volute (5) wall of the second centrifugal fan (2) is provided with a second through hole, which is configured to be suitable for opening and closing switching; When both the first through hole and the second through hole are open, the volute (5) of the first centrifugal fan (1) is connected to the volute (5) of the second centrifugal fan (2); The fan system is configured to switch between a first operating mode and a second operating mode; When the fan system is in the first working mode, the air inlet (3) and air outlet (4) of the first centrifugal fan (1) are both open, the air inlet (3) and air outlet (4) of the second centrifugal fan (2) are both open, the first through hole and the second through hole are both closed, and the first centrifugal fan (1) and the second centrifugal fan (2) are suitable for parallel operation and independent operation to extract oil fumes respectively; When the fan system is in the second working mode, the air inlet (3) of the first centrifugal fan (1) is open, the air outlet (4) of the first centrifugal fan (1) is closed, the air inlet (3) of the second centrifugal fan (2) is closed, the air outlet (4) of the second centrifugal fan (2) is open, the first through hole and the second through hole are both open, and the first centrifugal fan (1) and the second centrifugal fan (2) are suitable for operating in series to jointly exhaust oil fumes.

2. The fan system according to claim 1, characterized in that: Includes a first sealing device (8), configured to selectively seal the air inlet (3) of the first centrifugal fan (1) or the air inlet (3) of the second centrifugal fan (2); and / or Includes a second sealing device (9), configured to selectively seal either the outlet (4) of the first centrifugal fan (1) or the outlet (4) of the second centrifugal fan (2); and / or The volute (5) of the first centrifugal fan (1) and the volute (5) of the second centrifugal fan (2) are attached together, and the first through hole and the second through hole are the same through hole; and / or The volute (5) of the first centrifugal fan (1) and the volute (5) of the second centrifugal fan (2) are spaced a certain distance apart, and an airflow channel with both ends passing through the first through hole and the second through hole respectively is connected between them; and / or The first centrifugal fan (1) and the second centrifugal fan (2) are both single-sided inlet centrifugal fans; and / or The air inlet (3) of the first centrifugal fan (1) and the air inlet (3) of the second centrifugal fan (2) are both configured to open and close via an iris aperture structure; and / or The air outlet (4) of the first centrifugal fan (1) and the air outlet (4) of the second centrifugal fan (2) are both configured to switch between opening and closing through an iris aperture structure.

3. The fan system according to claim 1, characterized in that: Includes a first sealing device (8), configured to selectively seal the air inlet (3) of the first centrifugal fan (1) or the air inlet (3) of the second centrifugal fan (2); The first centrifugal fan (1) and the second centrifugal fan (2) are both single-sided air-inlet centrifugal fans; The air inlet (3) of the first centrifugal fan (1) and the air inlet (3) of the second centrifugal fan (2) are both open facing forward or both open facing backward.

4. The fan system according to claim 1, characterized in that: Includes a first sealing device (8), configured to selectively seal the air inlet (3) of the first centrifugal fan (1) or the air inlet (3) of the second centrifugal fan (2); When the fan system is in the first working mode, the first sealing device (8) is located between the air inlet (3) of the first centrifugal fan (1) and the air inlet (3) of the second centrifugal fan (2).

5. The fan system according to claim 1, characterized in that: Includes a second sealing device (9), configured to selectively seal the air outlet (4) of the first centrifugal fan (1) or the air outlet (4) of the second centrifugal fan (2); When the fan system is in the first working mode, the second sealing device (9) is located between the air outlet (4) of the first centrifugal fan (1) and the air outlet (4) of the second centrifugal fan (2).

6. The fan system according to claim 1, characterized in that: The volute (5) of the first centrifugal fan (1) and the volute (5) of the second centrifugal fan (2) are arranged symmetrically with respect to a vertical plane; The volute tongue (6) of the volute (5) of the first centrifugal fan (1) and the volute tongue (6) of the volute (5) of the second centrifugal fan (2) are arranged opposite to each other.

7. The fan system according to claim 1, characterized in that: The first through hole is configured to be opened and closed by means of an arc-shaped sliding panel structure or a roller blind structure; The second through hole is configured to be opened and closed via an arc-shaped sliding panel structure or a roller blind structure.

8. The fan system according to any one of claims 1 to 7, characterized in that: The first centrifugal fan (1) and the second centrifugal fan (2) are arranged sequentially from left to right or from right to left.

9. A range hood, characterized in that: Includes the wind turbine system as described in any one of claims 1 to 8.

10. A control method for a range hood as described in claim 9, characterized in that, include: Detect air resistance; If the detected wind resistance value is lower than the preset threshold, the fan system is controlled to operate in the first working mode; If the detected wind resistance value is higher than the preset threshold, the fan system is controlled to operate in the second working mode.

11. A control method for a range hood as described in claim 9, wherein the first centrifugal fan (1) and the second centrifugal fan (2) of the range hood respectively correspond to two burners on the lower stove, characterized in that, include: When the burner corresponding to the first centrifugal fan (1) is in a combustion state and the other burner is in a non-combustion state, the fan system is controlled to operate in the second working mode.

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