Range hood and control method thereof

Abstract

According to the range hood and the control method thereof disclosed by the invention, after cleaning liquid is sprayed on a mesh plate by a spray pipe, a foam layer is formed on the upper surface of the mesh plate, so that oil fume flows through the foam layer when passing through the mesh plate, and the foam adsorbs oil in the oil fume so as to achieve an oil filtering effect on the oil fume. Oil liquid can be formed after the foam and the oil are combined and flows back to the water tank through the overflowing holes, and due to the fact that the density of the oil liquid is smaller than that of water, the oil liquid can float on the water surface to form oil dirt. After the first water pump sucks liquid in the water tank to reduce the water level, the controller controls the water supply pipe to supplement liquid into the water tank through the water supply valve, so that the liquid level of the water tank is always kept at the highest water level as high as the overflow port, and therefore, after oil on the mesh plate flows back to the water tank, the water level in the water tank is higher than the overflow port; therefore, oil stains on the liquid level can be discharged through the overflow port. And the oil stain is discharged from the liquid level, so that the oil stain is more easily and completely discharged, and the pollution discharge effect of the range hood can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of range hoods, and in particular to a range hood and a control method thereof. Background Art

[0002] In the related art, the first process of treating oil smoke with a range hood is to form a foam layer on the mesh plate to absorb the oil in the oil smoke. A water tank is set under the mesh plate to allow the foam liquid adsorbing the oil to flow back to the water tank, and the liquid mixed with the oil is then discharged through the sewage outlet of the water tank. However, the sewage is discharged from the bottom of the tank, and the oil floats on the water surface. This means that each time the sewage is discharged, the cleaning liquid is discharged first and then the oil is discharged, causing the oil to easily adhere to the bottom of the tank and difficult to be discharged, affecting the sewage discharge effect of the range hood. Summary of the invention

[0003] The main purpose of the present invention is to provide a range hood, aiming to solve the technical problem of how to improve the sewage exhaust effect of the range hood.

[0004] To achieve the above object, the range hood proposed by the present invention comprises:

[0005] A casing, wherein the casing is provided with a water tank, an oil fume treatment channel and a smoke inlet, the oil fume treatment channel is located above the water tank, a smoke passage area is formed between the water tank and the oil fume treatment channel, and the oil fume treatment channel is connected with the smoke inlet through the smoke passage area; the water tank is used to contain a cleaning liquid mixed with a foaming agent, an overflow port is provided in the water tank, and the overflow port is higher than the bottom of the water tank;

[0006] A mesh plate, the mesh plate being installed at the inlet end of the oil fume treatment channel, and the mesh plate being provided with a plurality of flow holes;

[0007] A first water pump, wherein the first water pump is installed in the housing, and a water inlet end of the first water pump is connected to the bottom of the water tank;

[0008] a spray pipe, one end of which is connected to the water outlet of the first water pump and the other end of which is located above the mesh plate so as to spray cleaning liquid onto the mesh plate;

[0009] A water supply pipeline, the water outlet of which is connected to the water tank for replenishing liquid into the water tank;

[0010] A water supply valve, which is installed on the water supply pipeline to control the on-off of the water supply pipeline;

[0011] A controller is electrically connected to the water supply valve, and is used to control the water supply valve to conduct the water supply pipeline when the water level in the water tank is lower than the overflow port, so that the water level in the water tank is dynamically maintained near the overflow port.

[0012] Optionally, the range hood further comprises a detergent adding device installed in the casing, the detergent adding device comprising a liquid storage container and a second water pump, the liquid storage container is used to store detergent mixed with a foaming agent, the water inlet end of the second water pump is connected to the liquid storage container, and the water outlet end is connected to the water sink.

[0013] Optionally, the length of the water trough is greater than the length of the mesh plate, the water inlet end of the first water pump and the overflow port are respectively located at two ends of the water trough along the length direction, and the projection of the mesh plate on the bottom of the water trough is located between the water inlet end of the first water pump and the overflow port.

[0014] The present invention also provides a control method for a range hood, which is used to control the range hood as described above, wherein the range hood has a fume processing mode; the control method for the range hood comprises the following steps:

[0015] After entering the oil fume treatment mode, the first water pump is controlled to start, so as to drive the cleaning liquid in the water tank to spray on the upper surface of the mesh plate, so as to form a foam layer on the mesh plate for purifying oil fume; the cleaning liquid on the mesh plate flows downward back into the water tank through the flow holes; in the process of oil fume purification, the oil dirt that falls back into the water tank with the cleaning liquid floats on the liquid surface of the water tank;

[0016] opening a water supply valve to replenish the water tank so that the water level in the water tank is dynamically maintained adjacent to the overflow port;

[0017] After exiting the oil fume treatment mode, the first water pump and the water supply valve are controlled to be closed, and the cleaning liquid flows back into the water tank through the flow hole downward to raise the water level in the water tank, so that the oil floating on the liquid surface of the water tank can be discharged from the water tank through the overflow port.

[0018] Optionally, the range hood further comprises a water level sensor installed in the housing, the water level sensor is electrically connected to the controller, and the water level sensor is used to detect the water level in the water tank in real time;

[0019] The step of opening the water supply valve to replenish liquid in the water tank comprises:

[0020] Get the current water level in the tank in real time;

[0021] Comparing the current water level with the preset water level, wherein the height difference between the preset water level and the overflow port is less than or equal to a first preset difference;

[0022] It is determined that the current water level is less than the preset water level, and the water supply valve is controlled to conduct the water supply pipeline to replenish the water tank.

[0023] Optionally, after the step of controlling the first water pump and the water supply valve to close, the method further includes:

[0024] Confirm that the liquid on the mesh plate stops dripping into the sink;

[0025] The water supply valve is controlled to open the water supply pipeline to replenish liquid into the water tank, so as to discharge the oily dirt floating on the liquid surface and the oily dirt close to the liquid surface in the water tank to the overflow port.

[0026] Optionally, the step of confirming that the liquid on the mesh plate stops dripping into the water tank comprises:

[0027] Confirm that the first water pump stops, start timing, and after a first preset time, confirm that the liquid on the mesh plate stops dripping into the water tank.

[0028] Optionally, the step of controlling the start of the first water pump includes:

[0029] Get the current oil smoke concentration at the smoke inlet;

[0030] Obtaining a target power of the first water pump according to the current oil fume concentration, wherein the target power of the first water pump is positively correlated with the current oil fume concentration;

[0031] controlling the first water pump to operate at a target power;

[0032] And / or, the range hood further comprises a smoke exhaust fan installed in the oil fume processing channel, and the step of controlling the start-up of the first water pump comprises:

[0033] Get the current fan speed of the smoke exhaust fan;

[0034] Acquire a target power of the first water pump according to the current fan speed, wherein the target power of the first water pump is positively correlated with the current fan speed;

[0035] The first water pump is controlled to operate at a target power.

[0036] Optionally, the range hood further comprises a detergent adding device installed in the housing, the detergent adding device comprising a liquid storage container and a second water pump, the liquid storage container is used to store detergent mixed with a foaming agent, the water inlet end of the second water pump is connected to the liquid storage container, and the water outlet end of the second water pump is connected to the water tank; the water tank is provided with a drain port and a drain valve, and the drain valve is used to open or close the drain port;

[0037] The range hood also has a cleaning mode;

[0038] The control method of the range hood further comprises the following steps:

[0039] After entering the cleaning mode, control the drain valve to open the drain outlet;

[0040] Confirm that the sewage in the sink has been drained, control the water supply valve to connect the water supply pipeline, control the drain valve to close the drain outlet, and control the second water pump to pump detergent into the sink.

[0041] Optionally, before the step of entering the cleaning mode, the step further includes:

[0042] Get the cumulative running time of the range hood in the oil fume treatment mode since the range hood exited the last cleaning mode;

[0043] Comparing the accumulated running time with a second preset time;

[0044] Confirm that the accumulated operating time is greater than or equal to the second preset time, and obtain the current operating status of the range hood;

[0045] Confirm that the range hood is currently in sleep mode and enter cleaning mode.

[0046] In the technical solution of the range hood of the present invention, the first water pump can suck the cleaning liquid in the water tank and transport the cleaning liquid to the nozzle, and then the nozzle sprays the cleaning liquid on the upper surface of the mesh plate. Since the cleaning liquid is mixed with a foaming agent, the cleaning liquid will form a foam layer on the upper surface of the mesh plate after being sprayed on the mesh plate by the nozzle, so that the oil smoke will also flow through the foam layer when passing through the mesh plate, and the foam will absorb the oil in the oil smoke to filter the oil smoke. After the foam and the oil are combined, they will form oil liquid and flow back to the water tank through the flow hole. Since the density of the oil liquid is smaller than that of water, it will float on the water surface to form oil stains. After the first water pump sucks the liquid in the water tank to lower the water level, the controller controls the water supply pipe to replenish the liquid in the water tank through the water supply valve, so that the liquid level of the water tank is always maintained at the highest water level equal to the overflow port. In this way, after the oil liquid on the mesh plate flows back to the water tank, the water level in the water tank will be higher than the overflow port, so that the oil stains on the liquid surface can be discharged through the overflow port. Since the grease is drained away from the liquid surface, it is easier to reduce the waste of cleaning liquid while draining away the grease, thereby improving the drainage effect of the range hood. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0048] Figure 1 It is a structural schematic diagram of an embodiment of a range hood of the present invention;

[0049] Figure 2 A structural cross-sectional view of an embodiment of a range hood of the present invention;

[0050] Figure 3 is a cross-sectional schematic diagram of an embodiment of a range hood of the present invention;

[0051] Figure 4 A schematic diagram of the partial structure of an embodiment of a range hood of the present invention;

[0052] Figure 5 A schematic diagram of the partial structure of another embodiment of the range hood of the present invention;

[0053] Figure 6 A schematic diagram of the internal structure of a range hood according to an embodiment of the present invention;

[0054] Figure 7 A schematic diagram of a flow chart of an embodiment of a method for controlling a range hood of the present invention;

[0055] Figure 8 A schematic flow chart of another embodiment of a method for controlling a range hood according to the present invention;

[0056] Fig. 9 A schematic flow chart of another embodiment of a method for controlling a range hood according to the present invention;

[0057] Fig.10 The figure is a flow chart of another embodiment of the control method of the range hood of the present invention.

[0058] Description of Figure Numbers:

[0059] Label name Label name Label name 10 chassis 11 sink 12 Fume treatment channel 13 Smoke inlet 14 Smoking area 20 Mesh plate 30 First water pump 40 Nozzle 50 Oil filter components 51 Grease trap 111 Overflow 52 First oil separator 53 Filter front side 54 Filter back side 60 Detergent adding device

[0060] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0061] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0062] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0063] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text is to include three parallel solutions, taking "A and / or B as an example", including solution A, or solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0064] In the related art, the first process of treating oil smoke with a range hood is to form a foam layer on the mesh plate to absorb the oil in the oil smoke. A water tank is set under the mesh plate to allow the foam liquid adsorbing the oil to flow back to the water tank, and the liquid mixed with the oil is then discharged through the sewage outlet of the water tank. However, the sewage is discharged from the bottom of the tank, and the oil floats on the water surface. This means that each time the sewage is discharged, the cleaning liquid is discharged first and then the oil is discharged, causing the oil to easily adhere to the bottom of the tank and difficult to be discharged, affecting the sewage discharge effect of the range hood.

[0065] The present invention provides a range hood, aiming to solve the technical problem of how to improve the sewage exhaust effect of the range hood.

[0066] In the embodiment of the present invention, Figures 1 to 4As shown, the range hood comprises: a housing 10, wherein the housing 10 is provided with a water tank 11, an oil fume treatment channel 12 and a smoke inlet 13, wherein the oil fume treatment channel 12 is located above the water tank 11, and a smoke passage area 14 is formed between the water tank 11 and the oil fume treatment channel 12, wherein the oil fume treatment channel 12 is communicated with the smoke inlet 13 through the smoke passage area 14; the water tank 11 is used to contain a cleaning liquid mixed with a foaming agent, and an overflow port 111 is provided in the water tank 11, wherein the overflow port 111 is higher than the bottom of the water tank 11; a mesh plate 20, wherein the mesh plate 20 is installed at the inlet end of the oil fume treatment channel 12, and wherein the mesh plate 20 is provided with a plurality of flow holes; a first water pump 30, wherein the first water pump 30 is installed at the housing 10; In the shell 10, the water inlet end of the first water pump 30 is connected to the bottom of the water tank 11; a nozzle 40, one end of which is connected to the water outlet end of the first water pump 30 and the other end is located above the mesh plate 20 to spray cleaning liquid onto the mesh plate 20; a water supply pipeline, the water outlet end of the water supply pipeline is connected to the water tank 11 to replenish liquid into the water tank 11; a water supply valve, the water supply valve is installed on the water supply pipeline to control the on-off of the water supply pipeline; a controller, the controller is electrically connected to the water supply valve to control the water supply valve to conduct the water supply pipeline when the water level in the water tank 11 is lower than the overflow port 111, so that the water level in the water tank 11 is dynamically maintained near the overflow port 111.

[0067] In this embodiment, the housing 10 is used to form the overall appearance of the range hood. The specific shape of the housing 10 is not limited, and it only needs to be provided with a smoke inlet 13 and a fume treatment channel 12. The smoke inlet 13 can be provided on the front side wall of the housing 10, or on the bottom wall of the housing 10. It is not limited here, and it only needs to be satisfied that the oil fume flowing upward can enter the oil fume treatment channel 12 from the smoke inlet 13. The range hood may also include a smoke exhaust fan, which is installed in the oil fume treatment channel 12 to drive the airflow from the smoke inlet 13 to the oil fume treatment channel 12, so as to drive the oil fume near the smoke inlet 13 to flow into the oil fume treatment channel 12. The smoke passing area 14 is located downstream of the airflow direction of the smoke inlet 13 in the housing 10. After the oil fume flows into the smoke inlet 13, it first flows through the smoke area 14 and then flows upward to the oil fume treatment channel 12. When the oil smoke enters the oil smoke treatment channel 12, it first flows through the mesh plate 20. The mesh plate 20 is provided with a plurality of flow holes. The oil smoke can pass through the mesh plate 20 through the flow holes and then continue to flow upward.

[0068] The first water pump 30 can suck the cleaning liquid in the water tank 11 and transport the cleaning liquid to the nozzle 40, and then the nozzle 40 sprays the cleaning liquid on the upper surface of the mesh plate 20. Since the cleaning liquid is mixed with a foaming agent, the cleaning liquid will form a foam layer on the upper surface of the mesh plate 20 after being sprayed on the mesh plate 20 by the nozzle 40, so that the oil smoke will also flow through the foam layer when passing through the mesh plate 20. The foam will absorb the oil in the oil smoke to filter the oil in the oil smoke. After the foam and the oil are combined, they will form oil liquid and flow back to the water tank 11 through the flow hole. Since the density of the oil liquid is smaller than that of water, it will float on the water surface to form oil stains.

[0069] It should be noted that after the foam and oil are combined and flow back to the water tank 11, the foam on the mesh plate 20 will be reduced. Therefore, the first water pump 30 needs to continuously suck the liquid in the water tank 11 and spray it on the mesh plate 20 through the nozzle 40 to continuously form a new foam layer, thereby filtering the oil fume that continues to flow into the oil fume treatment channel 12. After the initially formed foam and oil are combined and flow back to the water tank 11, oil will float on the surface of the liquid in the water tank 11. The water inlet end of the first water pump 30 is close to the bottom of the water tank 11, so it can preferentially suck clean cleaning liquid to ensure that the cleaning liquid delivered to the nozzle 40 can form a new foam layer after being sprayed on the mesh plate 20.

[0070] The highest water level in the water tank 11 is the height of the overflow port 111. When the water level reaches the height of the overflow port 111, the liquid will begin to be discharged from the overflow port 111, and the liquid on the liquid surface will first flow to the overflow port 111. The oil is floating on the liquid surface, so the first thing to be discharged from the overflow port 111 is the oil floating on the liquid surface, thereby achieving the drainage of the oil in the water tank 11. The water supply pipe can replenish water in the water tank 11 so that the liquid level of the water tank 11 is always maintained at the highest water level equal to the overflow port 111. In this way, after the oil on the mesh plate 20 flows back to the water tank 11, the water level in the water tank 11 will be higher than the overflow port 111, so that the oil on the liquid surface can be discharged through the overflow port 111.

[0071] In the oil fume treatment mode of the range hood, the cleaning liquid in the water tank 11 will inevitably be lost under the suction of the water pump and the action of the smoke exhaust fan. This loss makes the water level of the water tank 11 lower than the overflow port 111 even if all the oil on the mesh plate 20 falls back to the water tank 11. Therefore, it is necessary to replenish water into the water tank 11 through a water replenishment pipe to make up for this part of the loss, so that the water level of the water tank 11 can be kept close to the overflow port, so that when the range hood exits the oil fume treatment mode, the cleaning liquid in the water tank 11 is no longer reduced by suction, and the oil on the mesh plate 20 will fall back to the water tank 11 to increase the water volume. The increased water volume will be discharged from the water tank 11 through the overflow port 111, so that the oil stains on the liquid surface can be discharged first through the overflow port 111.

[0072] Specifically, Figure 6As shown, the range hood further comprises a detergent adding device 60 installed in the housing 10, the detergent adding device 60 comprises a liquid storage container and a second water pump, the liquid storage container is used to store detergent mixed with a foaming agent, the water inlet end of the second water pump is connected to the liquid storage container, and the water outlet end of the second water pump is connected to the water tank 11. The detergent adding device 60 is installed above the water tank 11, and the detergent adding device 60 can add detergent to the water tank 11 through the second water pump to achieve effective renewal of the cleaning liquid in the water tank 11, ensuring that the cleaning liquid can effectively form a foam layer after being sprayed on the mesh plate 20. The time for adding the cleaning liquid by the cleaning liquid adding device can be after each water replenishment of the water supply pipeline, or after each water is drained and refilled in the water tank 11, and there is no limitation here.

[0073] In practical applications, such as Figure 4 As shown, the length of the water tank 11 is greater than the length of the mesh plate 20, the water inlet end of the first water pump 30 and the overflow port 111 are respectively located at the two ends of the water tank 11 along the length direction, and the projection of the mesh plate 20 on the bottom of the water tank 11 is located between the water inlet end of the first water pump 30 and the overflow port 111.

[0074] The water inlet end and the overflow port 111 of the first water pump 30 are located on both sides of the projection of the mesh plate 20 on the bottom of the water tank 11. The oil falling from the mesh plate 20 to the water tank 11 will not be immediately sucked by the first water pump 30 or discharged from the overflow port 111, but needs to flow to both sides of the water tank 11. In this way, the falling oil can have enough time in the water tank 11 to separate from the cleaning liquid before forming oil stains on the liquid surface. When the water level in the water tank 11 is higher than the overflow port 111, the oil stains floating on the liquid surface can first flow to the overflow port 111 and finally be discharged through the overflow port 111; and the cleaning liquid at the bottom of the water tank 11 can first flow to the water inlet end of the first water pump 30. In this way, the flow direction of the cleaning liquid toward the water inlet end of the first water pump 30 can be opposite to the flow direction of the oil stains toward the overflow port 111, thereby reducing the clean cleaning liquid flowing out of the overflow port 111 and reducing the oil stains flowing toward the water inlet end of the first water pump 30, thereby avoiding the waste of clean cleaning liquid and further reducing the oil stains sucked by the first water pump 30.

[0075] For example, Figure 5 As shown, the range hood further includes an oil filter assembly 50, which is installed on the water tank 11, and the side of the oil filter assembly 50 close to the water inlet end of the first water pump 30 is a rear filter side 54, and the side away from the water inlet end of the first water pump 30 is a front filter side 53. The oil filter assembly 50 is used to filter the oil in the liquid flowing from the front filter side 53 to the rear filter side 54.

[0076] The specific form of the oil filter assembly 50 is not limited, as long as it can intercept the oil and dirt flowing to the water inlet end of the first water pump 30. Under the suction of the water inlet end of the first water pump 30, the liquid in the water tank 11 will have an obvious flow path. For example, if the water inlet end of the first water pump 30 is close to the left wall of the water tank 11, the liquid in the water tank 11 will flow from right to left. At this time, the front filter side 53 of the oil filter assembly 50 is located on the right side of its rear filter side 54, so that when the liquid in the water tank 11 flows, it can flow from the front filter side 53 of the oil filter assembly 50 through the oil filter assembly 50, then flow to the rear filter side 54, and finally flow to the water inlet end of the first water pump 30. When the liquid flows through the oil filter assembly 50, the oil dirt floating on the water surface can be intercepted and filtered by the oil filter assembly 50, thereby reducing or preventing the oil dirt from being sucked by the first water pump 30 along with the cleaning liquid, so as to ensure that the liquid delivered to the nozzle 40 by the first water pump 30 is mainly clean cleaning liquid, so that the foam layer can be effectively formed after being sprayed on the mesh plate 20. In this way, the oil dirt can be prevented from affecting the formation of the foam layer on the mesh plate 20, so as to improve the adsorption effect of the foam layer on the oil, thereby improving the filtering effect of the range hood on the oil in the oil smoke. In addition, preventing or reducing the oil dirt from being sucked by the water pump can also prevent the oil dirt from adhering and accumulating inside the water pump and the nozzle 40 to cause the water pump and the nozzle 40 to be blocked, thereby ensuring the continuous working effect of the water pump and the nozzle 40.

[0077] In one embodiment, the oil filter assembly 50 may be a flow device having a liquid inlet on the front filter side 53 and a liquid outlet on the rear filter side 54. When the liquid in the water tank 11 flows through the oil filter assembly 50, it flows from the liquid inlet into the flow channel of the oil filter assembly 50 and then flows out from the liquid outlet, and the oil is also intercepted and filtered inside the oil filter assembly 50. Of course, the oil filter assembly 50 may also be an open structure without a flow channel.

[0078] Specifically, Figure 5 As shown, the oil filter assembly 50 includes an oil separator 51, which separates the water tank 11 into at least two tank bodies. A flow gap is formed between the bottom side of the oil separator 51 and the bottom of the water tank 11, and the flow gap connects two adjacent tank bodies. The top side of the oil separator 51 protrudes from the highest liquid level of the water tank 11 to intercept the oil floating on the liquid surface of the water tank 11; the water inlet end of the first water pump 30 is connected to one of the tank bodies.

[0079] The front side of the oil separator 51 is connected to the front wall of the water tank 11, and the rear side of the oil separator 51 is connected to the rear wall of the water tank 11. Since the top side of the oil separator 51 is higher than the liquid level, the liquid in the water tank 11 can only pass through the flow gap below the oil separator 51 when it flows through the oil separator 51. Since the oil is floating on the liquid surface of the water tank 11, the oil will be intercepted by the oil separator 51 and cannot pass through. Only when the liquid level of the water tank 11 drops to the flow gap can the oil pass through the flow gap. However, the liquid in the water tank 11 does not continue to decrease after being sucked by the first water pump 30. The oil flowing back to the water tank 11 from the mesh plate 20 will make the amount of liquid in the water tank 11 form a dynamic balance, so that the liquid level of the water tank 11 can be maintained at a position higher than the flow gap, so that the oil floating on the liquid surface can never flow to the water inlet end of the first water pump 30 through the flow gap, so as to achieve long-term interception of the oil. By intercepting the oil dirt floating on the liquid surface of the water tank 11 by the oil separator 51, the form of the oil filter assembly 50 can be simplified, so as to simplify the internal structure of the range hood and reduce the structural cost of the range hood.

[0080] The number of the oil separator 51 may be one, or more.

[0081] In practical applications, such as Figure 5 As shown, the number of the oil separators 51 is at least two, and at least two oil separators 51 are spaced apart along the length direction of the water tank 11. One oil separator 51 can separate the water tank 11 into two tank bodies, two oil separators 51 can separate the water tank 11 into three tank bodies, and so on, n oil separators 51 can separate the water tank 11 into n+1 tank bodies. The water inlet end of the first water pump 30 can be connected to any one of the tank bodies, so that when the liquid in the other n tank bodies flows to the water inlet end of the first water pump 30, it needs to pass through at least one oil separator 51 to intercept the oil floating on the liquid surface. Setting the number of oil separators 51 to two or more can reduce the burden of a single oil separator 51 on intercepting oil and improve the overall interception effect of the oil filter assembly 50 on oil.

[0082] For example, Figure 5 As shown, the length of the water tank 11 is greater than the length of the mesh plate 20, at least two of the oil separators 51 include a first oil separator 5251, the water inlet end of the first water pump 30 is located at the rear filter side 54 of the first oil separator 5251, and the projection of the mesh plate 20 on the bottom of the water tank 11 is located at the front filter side 53 of the first oil separator 5251.

[0083] The water inlet end of the first water pump 30 and the projection of the mesh plate 20 on the bottom of the water tank 11 are respectively located on both sides of the first oil separator 5251. In this way, it can be ensured that the oil on the mesh plate 20 is always on the front filter side 53 of the first oil separator 5251 when it just flows back to the water tank 11. That is, after the oil on the mesh plate 20 flows back to the water tank 11, when it flows to the water inlet end of the first water pump 30, it needs to at least flow through the first oil separator 5251, so that the oil on the liquid surface will at least be intercepted by the first oil separator 5251 to ensure that the water inlet end of the first water pump 30 sucks clean cleaning liquid.

[0084] Specifically, the spacing between two adjacent oil separators 51 is set to 50mm to 150mm, for example, it can be 50mm, 60mm, 70mm, 80mm, 90mm, 100mm, 110mm, 120mm, 130mm, 140mm or 150mm, etc. In this way, the distribution density of the oil separators 51 in the water tank 11 can be reasonably controlled, and the oil interception ability of the oil separators 51 to oil pollution can be ensured.

[0085] In practical applications, the height of the flow gap is set to 20mm to 40mm, for example, it can be 20mm, 25mm, 30mm, 35mm or 40mm, etc. In this way, the flow rate of the liquid flowing to the water inlet end of the first water pump 30 can be guaranteed, and the liquid level can be prevented from easily dropping to the flow gap.

[0086] For example, Figure 5 As shown, the range hood also includes a water supply pipeline, the water outlet end of the water supply pipeline is connected to the water tank 11 to replenish water into the water tank 11; an overflow port 111 is provided in the water tank 11, and the overflow port 111 is higher than the bottom of the water tank 11 and lower than the top side of the oil separator 51.

[0087] The highest water level in the water tank 11 is the height of the overflow port 111. When the water level reaches the height of the overflow port 111, the liquid will begin to be discharged from the overflow port 111, and the liquid on the liquid surface will first flow to the overflow port 111. The oil is floating on the liquid surface, so the first thing to be discharged from the overflow port 111 is the oil floating on the liquid surface, thereby achieving the drainage of the oil in the water tank 11. The water supply pipe can replenish water in the water tank 11 so that the liquid level of the water tank 11 is always maintained at the highest water level equal to the overflow port 111. In this way, after the oil on the mesh plate 20 flows back to the water tank 11, the water level in the water tank 11 will be higher than the overflow port 111, so that the oil on the liquid surface can be discharged through the overflow port 111.

[0088] Specifically, Figure 5As shown, the overflow port 111 is located at the front filter side 53 of the oil filter assembly 50. The clean cleaning liquid near the bottom of the water tank 11 can flow to the water inlet end of the first water pump 30 through the flow gap. After the oil floating on the liquid surface is intercepted at the front filter side 53 of the oil filter assembly 50, it can first flow to the overflow port 111 when the water level in the water tank 11 is higher than the overflow port 111, and finally be discharged through the overflow port 111. In this way, the flow direction of the cleaning liquid to the water inlet end of the first water pump 30 can be opposite to the flow direction of the oil to the overflow port 111, thereby reducing the clean cleaning liquid from flowing out of the overflow port 111 and reducing the oil to flow to the water inlet end of the first water pump 30, avoiding the waste of clean cleaning liquid and further reducing the oil being sucked by the first water pump 30.

[0089] The present invention also proposes a range hood control method for controlling the range hood as described above. The specific structure of the range hood refers to the above embodiments. Since the range hood adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments.

[0090] like Figure 7 As shown, the range hood has an oil fume processing mode; the control method of the range hood comprises the following steps:

[0091] S100, after entering the oil fume treatment mode, the first water pump 30 is controlled to start, so as to drive the cleaning liquid in the water tank 11 to spray on the upper surface of the mesh plate 20, so as to form a foam layer for purifying oil fume on the mesh plate 20; the cleaning liquid on the mesh plate 20 flows downward back into the water tank 11 through the flow holes; in the process of oil fume purification, the oil dirt falling into the water tank 11 with the cleaning liquid floats on the liquid surface of the water tank 11;

[0092] S200, opening the water supply valve to replenish liquid into the water tank 11, so that the water level in the water tank 11 is dynamically maintained near the overflow port 111;

[0093] S300, after exiting the oil fume treatment mode, the first water pump 30 and the water supply valve are controlled to be closed, and the cleaning liquid flows back downward to the water tank 11 through the flow hole to raise the water level in the water tank 11, so that the oil stains floating on the liquid surface of the water tank 11 can be discharged from the water tank 11 through the overflow port 111.

[0094] In this embodiment, the oil fume treatment mode is the process of the range hood treating oil fume normally. The range hood further comprises a fan and an oil fume ionization device installed in the housing 10. In the oil fume treatment mode, both the fan and the oil fume ionization device are turned on. The user can issue an oil fume treatment mode command through a remote control device or through the control panel of the range hood, which is not limited here.

[0095] After the range hood enters the oil fume treatment mode, the fan runs to generate negative pressure at the smoke inlet 13. The oil fume outside the smoke inlet 13 is sucked into the smoke inlet 13 under the action of the negative pressure. The oil fume first flows to the smoke passing area 14 between the mesh plate 20 and the water tank 11, and then flows upward to the oil fume treatment channel 12. When the oil fume enters the oil fume treatment channel 12, it first flows through the mesh plate 20, which is provided with a plurality of flow holes. The oil fume can pass through the mesh plate 20 through the flow holes and continue to flow upward.

[0096] The first water pump 30 can suck the cleaning liquid in the water tank 11 and transport the cleaning liquid to the nozzle 40, and then the nozzle 40 sprays the cleaning liquid on the upper surface of the mesh plate 20. Since the cleaning liquid is mixed with a foaming agent, the cleaning liquid will form a foam layer on the upper surface of the mesh plate 20 after being sprayed on the mesh plate 20 by the nozzle 40, so that the oil smoke will also flow through the foam layer when passing through the mesh plate 20. The foam will absorb the oil in the oil smoke to filter the oil in the oil smoke. After the foam and the oil are combined, they will form oil liquid and flow back to the water tank 11 through the flow hole. Since the density of the oil liquid is smaller than that of water, it will float on the water surface to form oil stains.

[0097] It should be noted that after the foam and oil are combined and flow back to the water tank 11, the foam on the mesh plate 20 will be reduced. Therefore, the first water pump 30 needs to continuously suck the liquid in the water tank 11 and spray it on the mesh plate 20 through the nozzle 40 to continuously form a new foam layer, thereby filtering the oil fume that continues to flow into the oil fume treatment channel 12. After the initially formed foam and oil are combined and flow back to the water tank 11, oil will float on the surface of the liquid in the water tank 11. The water inlet end of the first water pump 30 is close to the bottom of the water tank 11, so it can preferentially suck clean cleaning liquid to ensure that the cleaning liquid delivered to the nozzle 40 can form a new foam layer after being sprayed on the mesh plate 20.

[0098] The highest water level in the water tank 11 is the height of the overflow port 111. When the water level reaches the height of the overflow port 111, the liquid will begin to be discharged from the overflow port 111, and the liquid on the liquid surface will first flow to the overflow port 111. The oil is floating on the liquid surface, so the first thing to be discharged from the overflow port 111 is the oil floating on the liquid surface, thereby achieving the drainage of the oil in the water tank 11. The water supply pipe can replenish water in the water tank 11 so that the liquid level of the water tank 11 is always maintained at the highest water level equal to the overflow port 111. In this way, after the oil on the mesh plate 20 flows back to the water tank 11, the water level in the water tank 11 will be higher than the overflow port 111, so that the oil on the liquid surface can be discharged through the overflow port 111.

[0099] In the oil fume treatment mode of the range hood, the cleaning liquid in the water tank 11 will inevitably be lost under the suction of the water pump and the action of the smoke exhaust fan. This loss makes the water level of the water tank 11 lower than the overflow port 111 even if all the oil on the mesh plate 20 falls back to the water tank 11. Therefore, it is necessary to replenish water into the water tank 11 through a water replenishment pipe to make up for this part of the loss, so that the water level of the water tank 11 can be kept close to the overflow port, so that when the range hood exits the oil fume treatment mode, the cleaning liquid in the water tank 11 is no longer reduced by suction, and the oil on the mesh plate 20 will fall back to the water tank 11 to increase the water volume. The increased water volume will be discharged from the water tank 11 through the overflow port 111, so that the oil stains on the liquid surface can be discharged first through the overflow port 111.

[0100] Specifically, the range hood further comprises a water level sensor installed in the housing 10, the water level sensor is electrically connected to the controller, and the water level sensor is used to detect the water level in the water tank 11 in real time;

[0101] like Figure 8 As shown, the step of opening the water supply valve to replenish liquid into the water tank 11 includes:

[0102] S210, obtaining the current water level in the water tank 11 in real time;

[0103] S220, comparing the current water level with the preset water level, wherein the height difference between the preset water level and the overflow port 111 is less than or equal to a first preset difference;

[0104] S230 , determining that the current water level is lower than the preset water level, and controlling the water supply valve to connect the water supply pipeline to replenish the water tank 11 with liquid.

[0105] The preset water level is close to the overflow port 111, for example, the first preset difference is less than 5 mm, and can even be 0. The controller includes a main control board, on which a comparison circuit, a trigger circuit and a water supply control circuit are arranged. The water supply pipeline can be connected to a water source (such as a faucet or a water tank), and the water supply valve is an electrically controlled valve, and the water supply valve is electrically connected to the water supply control circuit. The water level sensor is electrically connected to the comparison circuit. The comparison circuit is set with a preset water level, and the preset water level is equal to the height of the overflow port 111. The water level sensor monitors the current water level in the water tank 11 in real time and transmits the signal of the current water level to the comparison circuit for comparison with the preset water level. When the current water level is lower than the overflow port 111 due to the suction of the first water pump 30, that is, lower than the preset water level, the comparison circuit triggers the trigger circuit, and the trigger circuit triggers the water supply control circuit, so that the water supply control circuit controls the water supply valve to conduct the water supply pipeline, so that the water supply pipeline replenishes water into the water tank 11. When the water supply pipeline replenishes the water level in the water tank 11 to a preset water level, based on the same control logic, the water supply control circuit controls the water supply valve to cut off the water supply pipeline to stop replenishing water to the water tank 11. In this way, after the liquid in the water tank 11 is pumped by the first water pump 30 and the water level is lowered, the water supply pipeline can replenish water to the water tank 11 in time to keep the water level of the water tank 11 close to the overflow port 111.

[0106] For example, Fig. 9 As shown, after the step of controlling the first water pump 30 and closing the water supply valve, the following step is further included:

[0107] S300, confirming that the liquid on the mesh plate 20 stops dripping into the water tank 11;

[0108] S400 , control the water supply valve to conduct the water supply pipeline, and replenish liquid to the water tank 11 , so as to discharge the oily dirt floating on the liquid surface and the oily dirt close to the liquid surface in the water tank 11 out of the overflow port 111 .

[0109] The range hood exits the oil fume treatment mode, indicating that there is no new oil fume to be treated, that is, there is no oil fume flowing through the mesh plate 20, so there is no need to form a new foam layer on the mesh plate 20, and the first water pump 30 stops pumping the liquid in the water tank 11, and the water level in the water tank 11 stops decreasing, so the water supply pipeline also temporarily stops replenishing water to the water tank 11. When the first water pump 30 stops pumping the liquid in the water tank 11, the nozzle 40 also stops spraying the cleaning liquid to the mesh plate 20, but before the nozzle 40 stops spraying, there is still a foam layer with oil on the mesh plate 20, and this part of the oil will slowly drip back to the water tank 11 after the first water pump 30 stops, causing the water level in the water tank 11 to slowly rise, so it is necessary to wait until this part of the oil stops dripping into the water tank 11 before confirming that no new oil will drip into the water tank 11 and confirming the latest water level of the water tank 11.

[0110] After confirming that the liquid on the mesh plate 20 stops dripping into the water tank 11, that is, confirming that no new oil will drip into the water tank 11 and the latest water level of the water tank 11, the water supply pipeline can be connected by controlling the water supply valve to replenish liquid to the water tank 11, so that the water level of the water tank 11 continues to rise. After the water level of the water tank 11 rises to the height of the overflow port 111, the oil stains floating on the liquid surface and the oil stains close to the liquid surface can be discharged from the overflow port 111. In this way, all the oil stains accumulated on the liquid surface of the water tank 11 after the last oil fume treatment mode can be discharged from the water tank 11 to ensure the timeliness of the range hood sewage discharge.

[0111] In step S400, a preset water replenishment amount can be obtained according to the current water level in the water tank 11, wherein the sum of the preset water replenishment amount and the current water volume in the water tank 11 is greater than the maximum capacity of the water tank 11, the maximum capacity of the water tank 11 and the water volume when the water level reaches the overflow port 111. In this way, it can be ensured that the amount of liquid in the water tank 11 exceeding the maximum capacity during the water replenishment process will be discharged from the overflow port 111, thereby ensuring that the oil stains floating on the liquid surface and the oil stains close to the liquid surface can be fully discharged from the overflow port 111.

[0112] There are many ways to determine whether the liquid on the mesh plate 20 has stopped dripping into the water tank 11. For example, it is possible to detect whether the liquid level in the water tank 11 fluctuates within a preset time period. If so, it means that the liquid on the mesh plate 20 is still intermittently dripping into the water tank 11; if not, it means that the liquid on the mesh plate 20 has stopped dripping into the water tank 11.

[0113] Specifically, Fig. 9 As shown, the step of confirming that the liquid on the mesh plate 20 stops dripping into the water tank 11 includes:

[0114] It is confirmed that the first water pump 30 stops, and the timing starts. After the first preset time has passed, it is confirmed that the liquid on the mesh plate 20 stops dripping into the water tank 11.

[0115] The first preset time should be sufficient to allow most of the liquid on the mesh plate 20 to drip into the water tank 11. For example, the first preset time can be set to 5 minutes to 10 minutes. Even if a small amount of liquid still drips from the mesh plate 20 into the water tank 11 after the first preset time, it can be regarded as an error within the allowable range. In this way, the judgment process of whether the liquid on the mesh plate 20 has stopped dripping into the water tank 11 can be simplified, thereby simplifying the control method of the range hood and the required judgment device.

[0116] Exemplarily, the step of controlling the start of the first water pump 30 includes:

[0117] S110, obtaining the current oil smoke concentration at the smoke inlet 13;

[0118] S120, obtaining a target power of the first water pump 30 according to the current oil fume concentration, wherein the target power of the first water pump 30 is positively correlated with the current oil fume concentration;

[0119] S130 : Control the first water pump 30 to operate at the target power.

[0120] The current oil fume concentration can be obtained through an air quality sensor, such as a PM2.5 concentration sensor. The higher the current oil fume concentration, the more foam layers need to be formed on the mesh plate 20, the faster the rate at which the nozzle 40 sprays the cleaning liquid onto the mesh plate 20, and the faster the rate at which the first water pump 30 draws the cleaning liquid from the water tank 11, thereby increasing the operating power required by the first water pump 30.

[0121] For example, the current oil fume concentration at the smoke inlet 13 is divided into low oil fume concentration, medium oil fume concentration and high oil fume concentration from low to high, and the target power of the first water pump 30 is divided into low power, medium power and high power corresponding to the current oil fume concentration. In this way, the foam layer formation speed on the mesh plate 20 and the current oil fume concentration at the smoke inlet 13 can be effectively corresponded to each other, so as to ensure that the foam layer can fully absorb the oil while reasonably controlling the operating power of the water pump to achieve energy saving and emission reduction.

[0122] Exemplarily, the range hood further includes a smoke exhaust fan installed in the oil fume processing channel 12, and the step of controlling the start of the first water pump 30 includes:

[0123] S140, obtaining the current fan speed of the smoke exhaust fan;

[0124] S150, obtaining a target power of the first water pump 30 according to the current fan speed, wherein the target power of the first water pump 30 is positively correlated with the current fan speed;

[0125] S160 : Control the first water pump 30 to operate at the target power.

[0126] The current fan speed is related to the current amount of oil smoke in the cooking environment. The greater the current fan speed, the greater the current amount of oil smoke in the cooking environment, and the more oil smoke is sucked into the smoke inlet 13 per unit time, and therefore the more oil smoke flows through the mesh plate 20 per unit time; at this time, more foam layers need to be formed on the mesh plate 20, the faster the rate at which the nozzle 40 sprays the cleaning liquid onto the mesh plate 20, and the faster the rate at which the first water pump 30 draws the cleaning liquid from the water tank 11, thereby the greater the operating power required by the first water pump 30.

[0127] For example, the current fan speed is divided into low speed, medium speed and high speed from low to high, and the target power of the first water pump 30 is divided into low power, medium power and high power corresponding to the current fan speed. In this way, the foam layer formation speed on the mesh plate 20 can be effectively corresponded to the current fan speed, that is, the foam layer formation speed on the mesh plate 20 and the amount of oil smoke flowing through the mesh plate 20 per unit time can be effectively corresponded, so that while ensuring that the foam layer can fully absorb the oil in the oil smoke, the operating power of the water pump can be reasonably controlled to achieve energy saving and emission reduction.

[0128] Exemplarily, the range hood further comprises a detergent adding device 60 installed in the housing 10, the detergent adding device 60 comprises a liquid storage container and a second water pump, the liquid storage container is used to store detergent mixed with a foaming agent, the water inlet end of the second water pump is connected to the liquid storage container, and the water outlet end of the second water pump is connected to the water tank 11; the water tank 11 is provided with a drain port and a drain valve, and the drain valve is used to open or close the drain port;

[0129] like Fig.10 As shown, the range hood also has a cleaning mode;

[0130] The control method of the range hood further comprises the following steps:

[0131] S550, after entering the cleaning mode, control the drain valve to open the drain outlet;

[0132] S560 , confirming that the sewage in the water tank 11 has been drained, controlling the water supply valve to connect the water supply pipeline, controlling the drain valve to close the drain outlet, and controlling the second water pump to pump detergent toward the water tank 11 .

[0133] The drain valve is an electrically controlled valve and is electrically connected to the controller, so the controller can control the on and off of the drain valve through the circuit. The drain port is opened at the bottom of the water tank 11 so that the sewage in the water tank 11 can be drained through the drain port. The user can issue a cleaning mode instruction through a remote control device or through the control panel of the range hood, which is not limited here. Of course, the range hood can also automatically enter the cleaning mode after reaching the preset conditions. After the range hood enters the cleaning mode, the drain valve opens the drain port to drain the sewage in the water tank 11 first. After confirming that the sewage in the water tank 11 has been drained, the water supply valve conducts the water supply pipeline to replenish water into the water tank 11; the drain valve closes the drain port to prevent the newly replenished water from flowing away; the detergent adding device 60 adds detergent to the water tank 11 so that the detergent and the newly replenished water are mixed to form a new cleaning liquid, so that the range hood prepares a new cleaning liquid for the next oil fume treatment mode.

[0134] There are many ways to confirm that the sewage in the sink 11 has been drained, for example, you can detect whether the water level in the sink 11 is zero or reaches the minimum preset water level, or you can detect whether there is still water flowing through the drain after the drain is opened for a preset time. There is no limitation here.

[0135] It should be noted that after controlling the water supply valve to connect the water supply pipeline, the timing can be started first, and after the third preset time has elapsed, the drain valve can be controlled to close the drain outlet. In this way, during the period when the water supply pipeline replenishes water to the water tank 11 and the drain outlet has not yet been closed, the water replenished into the water tank 11 by the water supply pipeline can first flush away the sewage remaining at the bottom of the tank, so as to improve the cleaning effect of the water tank 11 and avoid the residual sewage from mixing into the new cleaning liquid.

[0136] Specifically, Fig.10 As shown, before the step of entering the cleaning mode, the step also includes:

[0137] S510, obtaining the cumulative running time of the range hood in the oil fume treatment mode since the range hood last exited the cleaning mode;

[0138] S520, comparing the accumulated running time with a second preset time;

[0139] S530, confirming that the accumulated operating time is greater than or equal to the second preset time, and obtaining the current operating status of the range hood;

[0140] S540, confirm that the range hood is currently in sleep mode and enter the cleaning mode.

[0141] After the range hood exits the cleaning mode each time, it will repeatedly operate in the oil fume treatment mode. The operation time of each oil fume treatment mode will be recorded, and the operation time of multiple oil fume treatment modes will be added together to form the cumulative operation time. When the cumulative operation time of the oil fume treatment mode reaches the second preset time, for example, 17 hours, it means that a certain amount of sewage has accumulated in the water tank 11. At this time, it is difficult for the cleaning liquid in the water tank 11 to form a new foam layer on the mesh plate 20. Therefore, it is necessary to drain the sewage first, and then add new water and detergent to form a new cleaning liquid.

[0142] When the cumulative running time of the oil fume treatment mode reaches the second preset time, the range hood can automatically enter the cleaning mode to achieve automatic cleaning without the user giving instructions, so as to save waiting time. If the range hood is in the oil fume treatment mode when the cumulative running time reaches the second preset time, it is not suitable to directly enter the cleaning mode to avoid affecting the normal use of the range hood. Therefore, after confirming that the cumulative running time reaches the second preset time, the operation status of the range hood should continue to be confirmed. If the range hood is in the sleep mode, it can directly enter the cleaning mode. If the range hood is in the oil fume treatment mode, the current operation status of the range hood will be continuously obtained or obtained at intervals until it is confirmed that the range hood is currently in the sleep mode, and then the cleaning mode can be entered. In this way, it can be ensured that the oil fume treatment mode of the range hood will not be interrupted.

[0143] There will be a standby interval between two adjacent oil fume treatment modes of the range hood. If the standby time is greater than or equal to the fourth preset time, it means that the peak period of use of the range hood has passed. At this time, it can be judged that the range hood will enter a sleep mode with a longer standby time. The cleaning mode can be turned on in the sleep mode to drain the sewage in time and replenish new cleaning liquid. After the cumulative running time of the oil fume treatment mode reaches the preset condition, the standby time is used to confirm whether to enter the cleaning mode, which can avoid the user continuing to use the oil fume treatment mode when the cleaning mode is not over. The fourth preset time can be set to 15 minutes to 30 minutes. In this way, it can be ensured that the peak usage period has been staggered when the range hood enters the cleaning mode, and the range hood can enter the cleaning mode faster to prevent other situations from occurring due to long waiting time.

[0144] The above descriptions are only optional embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention's specification and drawings, or directly / indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A range hood, characterized in that: include: A casing, wherein the casing is provided with a water tank, an oil fume treatment channel and a smoke inlet, the oil fume treatment channel is located above the water tank, a smoke passage area is formed between the water tank and the oil fume treatment channel, and the oil fume treatment channel is connected with the smoke inlet through the smoke passage area; the water tank is used to contain a cleaning liquid mixed with a foaming agent, an overflow port is provided in the water tank, and the overflow port is higher than the bottom of the water tank; A mesh plate, the mesh plate being installed at the inlet end of the oil fume treatment channel, and the mesh plate being provided with a plurality of flow holes; A first water pump, wherein the first water pump is installed in the housing, and a water inlet end of the first water pump is connected to the bottom of the water tank; a spray pipe, one end of which is connected to the water outlet of the first water pump and the other end of which is located above the mesh plate so as to spray cleaning liquid onto the mesh plate; A water supply pipeline, the water outlet of which is connected to the water tank for replenishing liquid into the water tank; A water supply valve, which is installed on the water supply pipeline to control the on-off of the water supply pipeline; A controller is electrically connected to the water supply valve, and is used to control the water supply valve to conduct the water supply pipeline when the water level in the water tank is lower than the overflow port, so that the water level in the water tank is dynamically maintained near the overflow port.

2. The range hood according to claim 1, characterized in that: The range hood also includes a detergent adding device installed in the casing, the detergent adding device includes a liquid storage container and a second water pump, the liquid storage container is used to store detergent mixed with a foaming agent, the water inlet end of the second water pump is connected to the liquid storage container, and the water outlet end is connected to the water tank.

3. The range hood according to claim 1, characterized in that: The length of the water tank is greater than that of the mesh plate, the water inlet end of the first water pump and the overflow port are respectively located at two ends of the water tank along the length direction, and the projection of the mesh plate on the bottom of the water tank is located between the water inlet end of the first water pump and the overflow port.

4. A control method for a range hood, characterized in that: The range hood comprises: A casing, wherein the casing is provided with a water tank, an oil fume treatment channel and a smoke inlet, the oil fume treatment channel is located above the water tank, a smoke passage area is formed between the water tank and the oil fume treatment channel, and the oil fume treatment channel is connected with the smoke inlet through the smoke passage area; the water tank is used to contain a cleaning liquid mixed with a foaming agent, an overflow port is provided in the water tank, and the overflow port is higher than the bottom of the water tank; A mesh plate, the mesh plate being installed at the inlet end of the oil fume treatment channel, and the mesh plate being provided with a plurality of flow holes; A first water pump, wherein the first water pump is installed in the housing, and a water inlet end of the first water pump is connected to the bottom of the water tank; a spray pipe, one end of which is connected to the water outlet of the first water pump and the other end of which is located above the mesh plate so as to spray cleaning liquid onto the mesh plate; A water supply pipeline, the water outlet of which is connected to the water tank for replenishing liquid into the water tank; A water supply valve, which is installed on the water supply pipeline to control the on-off of the water supply pipeline; a controller, the controller being electrically connected to the water supply valve, and being used for controlling the water supply valve to conduct the water supply pipeline when the water level in the water tank is lower than the overflow port, so that the water level in the water tank is dynamically maintained close to the overflow port; The range hood has a fume treatment mode; The control method of the range hood comprises the following steps: After entering the oil fume treatment mode, the first water pump is controlled to start, so as to drive the cleaning liquid in the water tank to spray on the upper surface of the mesh plate, so as to form a foam layer on the mesh plate for purifying oil fume; the cleaning liquid on the mesh plate flows downward back into the water tank through the flow holes; in the process of oil fume purification, the oil dirt that falls back into the water tank with the cleaning liquid floats on the liquid surface of the water tank; opening a water supply valve to replenish the water tank so that the water level in the water tank is dynamically maintained adjacent to the overflow port; After exiting the oil fume treatment mode, the first water pump and the water supply valve are controlled to be closed, and the cleaning liquid flows back into the water tank through the flow hole downward to raise the water level in the water tank, so that the oil floating on the liquid surface of the water tank can be discharged from the water tank through the overflow port.

5. The control method of the range hood according to claim 4, characterized in that: The range hood further comprises a water level sensor installed in the housing, the water level sensor is electrically connected to the controller, and the water level sensor is used to detect the water level in the water tank in real time; The step of opening the water supply valve to replenish liquid in the water tank comprises: Get the current water level in the tank in real time; Comparing the current water level with the preset water level, wherein the height difference between the preset water level and the overflow port is less than or equal to a first preset difference; It is determined that the current water level is less than the preset water level, and the water supply valve is controlled to conduct the water supply pipeline to replenish the water tank.

6. The control method of the range hood according to claim 4, characterized in that: After the step of controlling the first water pump and the water supply valve to close, the method further includes: Confirm that the liquid on the mesh plate stops dripping into the sink; The water supply valve is controlled to open the water supply pipeline to replenish liquid into the water tank, so as to discharge the oily dirt floating on the liquid surface and the oily dirt close to the liquid surface in the water tank to the overflow port.

7. The control method of the range hood according to claim 6, characterized in that: The step of confirming that the liquid on the mesh plate stops dripping into the water tank comprises: Confirm that the first water pump stops, start timing, and after a first preset time, confirm that the liquid on the mesh plate stops dripping into the water tank.

8. The control method of the range hood according to claim 4, characterized in that: The step of controlling the start-up of the first water pump comprises: Get the current oil smoke concentration at the smoke inlet; Obtaining a target power of the first water pump according to the current oil fume concentration, wherein the target power of the first water pump is positively correlated with the current oil fume concentration; controlling the first water pump to operate at a target power; And / or, the range hood further comprises a smoke exhaust fan installed in the oil fume processing channel, and the step of controlling the start-up of the first water pump comprises: Get the current fan speed of the smoke exhaust fan; Acquire a target power of the first water pump according to the current fan speed, wherein the target power of the first water pump is positively correlated with the current fan speed; The first water pump is controlled to operate at a target power.

9. The control method of the range hood according to claim 4, characterized in that: The range hood further comprises a detergent adding device installed in the housing, the detergent adding device comprises a liquid storage container and a second water pump, the liquid storage container is used to store detergent mixed with a foaming agent, the water inlet end of the second water pump is connected to the liquid storage container, and the water outlet end of the second water pump is connected to the water tank; the water tank is provided with a drain port and a drain valve, and the drain valve is used to open or close the drain port; The range hood also has a cleaning mode; The control method of the range hood further comprises the following steps: After entering the cleaning mode, control the drain valve to open the drain outlet; Confirm that the sewage in the sink has been drained, control the water supply valve to connect the water supply pipeline, control the drain valve to close the drain outlet, and control the second water pump to pump detergent into the sink.

10. The control method of the range hood according to claim 9, characterized in that: The step of entering the cleaning mode also includes: Get the cumulative running time of the range hood in the oil fume treatment mode since the range hood exited the last cleaning mode; Comparing the accumulated running time with a second preset time; Confirm that the accumulated operating time is greater than or equal to the second preset time, and obtain the current operating status of the range hood; Confirm that the range hood is currently in sleep mode and enter cleaning mode.

Images