Self-cleaning range hood and control method thereof

Abstract

The present invention relates to a self-cleaning range hood and a control method thereof, the range hood comprising: a machine body; a fan system; a cleaning device, comprising a pressurized container, the pressurized container having an air inlet, a liquid inlet and a fluid outlet for the gas-liquid mixed fluid formed by pressurization inside the pressurized container to flow out; a pressurized piston member is arranged in the pressurized container; the self-cleaning range hood also comprises: a booster device, comprising a booster cylinder and a power output shaft telescopically arranged in the booster cylinder, the booster cylinder comprising a ventilation chamber and a booster chamber, the ventilation chamber and the booster chamber are separated by a first piston member reciprocatingly movable in the booster cylinder, the ventilation chamber is connected to the air outlet of the volute, and the booster chamber is filled with a non-compressible fluid medium, thereby driving the power output shaft to extend and driving the pressurized piston member in the pressurized container to achieve pressurization. There is no need to install an additional power mechanism to boost the pressurized container, thereby simplifying the structure of the cleaning device and reducing the production cost.

Description

Technical Field

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

[0002] A range hood is a kitchen appliance that purifies the kitchen environment. When the range hood is used for cooking, its filter screen will be clogged with oil fume stains when filtering oil fume. Over time, the filter screen will be clogged, affecting the air volume and the smoke extraction effect of the range hood. Therefore, a self-cleaning device needs to be installed in the range hood.

[0003] At present, the self-cleaning function of the range hood is mainly realized by steam and water cleaning, such as a self-cleaning range hood fan system with application number CN201721502016.8, which discloses this cleaning method. There is also a method of using heating to enhance the fluidity of oil stains, and then cooperating with the rotation of the fan to achieve the separation of oil stains from the range hood body, such as a range hood with internal self-cleaning function with application number CN201020611727.0, which discloses this cleaning method. However, the source of steam and water mainly depends on the combination of water pumps and heaters, and it is necessary to arrange related heating elements and pipelines in the range hood system. The pipeline structure is complex, difficult to layout, and occupies a large space. The heating method mainly relies on heating equipment such as electric heating wires, which are applied to the volute or impeller and other parts. However, the effect of heating oil stains to achieve self-cleaning of the range hood is general.

[0004] To this end, the Chinese utility model patent with application number CN202020620320.8 (authorization announcement number: CN212204663U) discloses a range hood, whose cleaning device includes: a gas mixing tank, a bubbler, a water inlet control part and an air inlet control part. When the cleaning function of the range hood is started, the water source and the air source enter the gas mixing tank from the inlet, and are compressed in the space to obtain high-pressure water, which is then released through the bubbler to obtain bubble water to clean the inside of the range hood. The tiny bubbles burst after contacting the fan and the body, releasing local high pressure, which can effectively impact dirt such as oil stains, and achieve the effect of enhancing the cleaning of the liquid medium.

[0005] However, the range hood in the above patent application still has certain shortcomings. First, in order to increase the gas solubility in the gas mixing tank, it is necessary to ensure that there is sufficient pressure in the gas mixing tank. To achieve the pressurization of the gas mixing tank, it is necessary to add a corresponding power device, which makes the cleaning device of the range hood complex and has a high production cost. Secondly, due to the setting of the bubbler, the gas solubility in the water will decrease rapidly, and a large number of microbubbles will precipitate quickly. However, the size of the microbubbles reaching the surface of the parts to be cleaned is not easy to control, the explosion energy is limited, and the decontamination effect is not good.

[0006] Therefore, existing range hoods need further improvement. Summary of the invention

[0007] The first technical problem to be solved by the present invention is to provide a self-cleaning range hood that can pressurize the gas-liquid mixed fluid used for cleaning and thus improve the cleaning effect without installing an additional power mechanism in view of the current status of the prior art.

[0008] The second technical problem to be solved by the present invention is to provide a self-cleaning range hood in response to the current status of the prior art, which can prevent the microbubbles in the pressurized gas-liquid mixed fluid from precipitating in large quantities before being sprayed onto the surface of the component to be cleaned, thereby affecting its decontamination effect.

[0009] The third technical problem to be solved by the present invention is to provide a control method for a self-cleaning range hood in response to the current status of the prior art, which can pressurize the gas-liquid mixed fluid used for cleaning without installing an additional power mechanism, thereby improving the cleaning effect.

[0010] The technical solution adopted by the present invention to solve the first technical problem is: a self-cleaning range hood, comprising:

[0011] Body;

[0012] A fan system is disposed in the body and comprises a volute having an air outlet;

[0013] The cleaning device comprises a pressurized container having an air inlet for external gas to enter therein, a liquid inlet for external liquid to enter therein, and a fluid outlet for a gas-liquid mixed fluid pressurized inside the pressurized container to flow out;

[0014] The pressurized container is provided with a pressurized piston member for pressurizing the gas or liquid fluid entering therein;

[0015] Self-cleaning range hoods also include:

[0016] A boosting device comprises a boosting cylinder and a power output shaft telescopically arranged in the boosting cylinder, the boosting cylinder comprising a ventilation chamber with adjustable volume and a boosting chamber independent of the ventilation chamber, the ventilation chamber and the boosting chamber are separated by a first piston member reciprocatingly movable in the boosting cylinder, the ventilation chamber is communicated with an air outlet of the volute, the boosting chamber is filled with a non-compressible fluid medium, so that the pressure from the first piston member is increased and transmitted to the power output shaft, and the power output shaft is driven to extend, and the power output shaft of the boosting device is connected to the pressurizing piston member in the pressurized container.

[0017] In order to simplify the structure of the boosting device and ensure the boosting effect, a second piston member that can move back and forth is also provided in the boosting cylinder body. The internal space in the boosting cylinder body corresponding to the first piston member and the second piston member constitutes the boosting chamber. The area of ​​the first piston member is smaller than the area of ​​the second piston member. The piston rod of the second piston member constitutes the power output shaft of the boosting device.

[0018] The technical solution adopted by the present invention to solve the second technical problem is: the fluid outlet of the pressurized container is connected with a spray pipe for drawing out the pressurized gas-liquid mixed fluid and spraying it to the parts to be cleaned of the range hood.

[0019] After the gas-liquid mixed fluid in the pressurized container is directly sprayed onto the surface of the part to be cleaned through the spray pipe, the rapid change in pressure after spraying can be used to precipitate the dissolved gas, generating micro-explosions to enhance the cleaning effect.

[0020] As an improvement, the part to be cleaned of the range hood is the volute of the fan system or the impeller arranged in the volute.

[0021] In order to realize automatic liquid replenishment and gas replenishment operations of the pressurized container by controlling the pressure in the ventilation chamber, thereby saving the power device for liquid and gas supply, the ventilation chamber is provided with a one-way control valve for allowing the gas at the volute air outlet to enter the ventilation chamber in one direction and a pressure relief control valve for relieving the pressure of the ventilation chamber, the air inlet of the pressurized container is provided with a first control valve for controlling the opening and closing of the air inlet, the liquid inlet of the pressurized container is provided with a second control valve for controlling the opening and closing of the liquid inlet, and the fluid outlet of the pressurized container is provided with a third control valve for controlling the opening and closing of the fluid outlet;

[0022] The one-way control valve, the pressure relief control valve, the first control valve, the second control valve, the third control valve and the fan system are all electrically connected to the controller of the range hood.

[0023] In order to control the pressurization process of the gas-liquid fluid in the pressurized container and thus ensure the dissolution effect of the gas, a pressure sensor for detecting the pressure in the pressurized container is also included, and the pressure sensor is also electrically connected to the controller.

[0024] Normally, after the fan system is started and begins to run for a period of time, the air pressure increases and the check valve will open accordingly. After the check valve opens, due to the external flue resistance, the fan speed will drop suddenly and the pressure will drop rapidly, so it is impossible to provide a stable driving pressure for the boosting device. For this reason, it also includes a check valve arranged at the air outlet of the range hood or in the flow channel downstream of the air outlet, and a drive mechanism for controlling the opening and closing of the check valve.

[0025] The technical solution adopted by the present invention to solve the third technical problem is: a control method for a self-cleaning range hood, comprising the following steps:

[0026] S1, start cleaning mode;

[0027] S2, the one-way control valve of the ventilation chamber and the third control valve of the pressurized container are closed, the pressure relief control valve of the ventilation chamber and the second control valve of the pressurized container are opened, the first piston member, the second piston member in the booster cylinder and the pressurized piston member in the pressurized container move under the negative pressure of the ventilation chamber, the external liquid enters the pressurized container through the liquid inlet, after the liquid in the pressurized container is replenished, the second control valve is controlled to be closed, and the first control valve is opened, the external gas enters the pressurized container through the gas inlet, after the gas in the pressurized container is replenished, the first control valve and the pressure relief control valve are closed, and then the process enters step S3;

[0028] S3, open the one-way control valve of the ventilation chamber, start the fan system, introduce the high-pressure gas at the air outlet of the volute into the ventilation chamber, apply pressure to the first piston member, increase the pressure through the pressurization chamber, extend the second piston member, drive the pressurization piston member in the pressurization container to move, pressurize the gas-liquid mixed fluid entering the pressurization container, and then enter step S4;

[0029] S4, judging whether the pressure in the pressurized container reaches the set pressure P0, if yes, the fan system is switched to or maintained at a low gear, and then the third control valve is opened to spray the pressurized gas-liquid mixed fluid onto the component to be cleaned, and then enter step S5, if no, enter step S6;

[0030] S5, after the spraying process lasts for a set time, the third control valve is closed, and a cleaning cycle ends. Then, it is determined whether to enter the next cleaning cycle. If yes, it returns to step S2. If not, the one-way control valve, the pressure relief control valve, the first control valve, the second control valve and the third control valve are all closed, and the fan system is closed after running for a set time, and the cleaning process ends.

[0031] S6, judging whether the current wind speed of the fan system reaches the maximum wind speed, if yes, proceeding to step S7, if no, increasing the gear of the fan system, and then returning to step S4;

[0032] S7, determine whether the fan system has a sudden reduction in speed. If so, control the fan system to stop rotating, wait for a set time, and return to step S3. If not, return to step S4.

[0033] The control method of the self-cleaning range hood described above utilizes a period of time after the range hood fan is turned on, that is, before the check valve is opened, due to the continuous increase in the fan speed and the pressure at the air outlet, combined with a pressurizing device that uses Pascal's law to achieve pressurization, to pressurize the gas and liquid in the pressurized container, and then utilizes the characteristics of the gas-liquid mixed fluid that a large number of bubbles are precipitated due to the pressure reduction (the solubility of air in the liquid decreases rapidly) after being ejected, to achieve micro-explosion cleaning of difficult-to-clean parts such as impellers and volutes. On the other hand, the opening and falling rules of the range hood check valve are also utilized to achieve intermittent pressurization of the gas-liquid fluid in the pressurized container, and on the basis of minimizing the cost of cleaning and using the range hood, effective cleaning of the range hood is achieved.

[0034] As an improvement, in order to simplify the control process of the injection operation, in step S2, whether the liquid in the pressurized container is replenished is determined by whether the opening time of the second control valve reaches the set time, and whether the gas in the pressurized container is replenished is determined by whether the opening time of the first control valve reaches the set time.

[0035] The present invention also relates to a control method for a self-cleaning range hood, comprising the following steps:

[0036] S1, start cleaning mode;

[0037] S2, determine whether the check valve is in a closed state, if yes, proceed to step S3, if no, close the check valve and proceed to step S3;

[0038] S3, the one-way control valve of the ventilation chamber and the third control valve of the pressurized container are closed, the pressure relief control valve of the ventilation chamber and the second control valve of the pressurized container are opened, the first piston member, the second piston member in the booster cylinder and the pressurized piston member in the pressurized container move under the negative pressure of the ventilation chamber, the external liquid enters the pressurized container through the liquid inlet, after the liquid in the pressurized container is replenished, the second control valve is controlled to be closed, and the first control valve is opened, the external gas enters the pressurized container through the gas inlet, after the gas in the pressurized container is replenished, the first control valve and the pressure relief control valve are closed, and then the process enters step S4;

[0039] S4, open the one-way control valve of the ventilation chamber, start the fan system, introduce the high-pressure gas at the air outlet of the volute into the ventilation chamber, apply pressure to the first piston member, increase the pressure through the pressurization chamber, extend the second piston member, drive the pressurization piston member in the pressurization container to move, pressurize the gas-liquid mixed fluid entering the pressurization container, and then enter step S5;

[0040] S5, judging whether the pressure in the pressurized container reaches the set pressure P0, if yes, the fan system is switched to or maintained at a low gear, and then the third control valve is opened to spray the pressurized gas-liquid mixed fluid onto the component to be cleaned, and then enter step S6, if no, enter step S7;

[0041] S6, after the spraying process lasts for a set time, the third control valve is closed, and a cleaning cycle ends. Then, it is determined whether to enter the next cleaning cycle. If yes, it returns to step S3. If not, the one-way control valve, the pressure relief control valve, the first control valve, the second control valve and the third control valve are all closed, and the fan system is closed after running for a set time, and the cleaning process ends.

[0042] S7, determine whether the current wind speed of the fan system reaches the maximum wind speed, if yes, return to step S5, if no, increase the gear of the fan system, and then return to step S5.

[0043] After the cleaning program is started, under the command of the control system, it is possible to first detect whether the valve plate of the check valve is in a closed state. If not, the check valve can be immediately driven to close through the driving mechanism, and then the pressurization process is started. By actively closing the check valve, there is no need to wait for the check valve plate to fall back before the pressurization container can be pressurized again as with a conventional check valve, thereby ensuring that the pressurization process of the pressurization container can be carried out sustainably, saving time during the entire cleaning process of the range hood.

[0044] Compared with the prior art, the advantages of the present invention are as follows: when it is necessary to clean the parts to be cleaned of the range hood, the air pressure at the air outlet of the fan system can be introduced as a power source, and after the pressure is further increased by the booster device, the pressurized piston can be driven to pressurize the gas and liquid in the pressurized container, ensuring that a gas-liquid mixed fluid with high gas solubility can be obtained in the pressurized container, and then the gas-liquid mixed fluid is sprayed out. The characteristics of a large number of bubbles are precipitated due to the pressure reduction (the solubility of air in the liquid is also rapidly reduced), and the micro-explosion cleaning of the impeller, volute and other difficult-to-clean parts is achieved. This self-cleaning range hood itself does not need to install an additional power mechanism to pressurize the pressurized container, thereby simplifying the structure of the cleaning device and reducing the production cost. In the preferred embodiment, only by controlling the corresponding valves on the boosting device and the pressurized container, the gas-liquid mixed fluid in the pressurized container can be sprayed out to clean the parts to be cleaned of the range hood; similarly, in the process of depressurizing the ventilation chamber, the automatic liquid and air suction process of the pressurized container can be realized, eliminating power components such as air pumps or liquid pumps for air and liquid supply, further simplifying the structure of the cleaning device and reducing production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1A schematic diagram of the three-dimensional structure of a range hood according to an embodiment of the present invention (showing a state in which the range hood is connected to an external flue through a smoke exhaust pipe);

[0046] Figure 2 A schematic diagram of the three-dimensional structure of a cleaning device according to an embodiment of the present invention;

[0047] Figure 3 This is a control flow chart of a range hood according to an embodiment of the present invention (the check valve plate falls back naturally);

[0048] Figure 4 This is a control flow chart of a range hood according to an embodiment of the present invention (the check valve plate is actively closed by the electromagnetic suction cup);

[0049] Figure 5 A diagram showing the speed variation of the fan system of an embodiment of the present invention within a period of time after being turned on;

[0050] Figure 6 The figure is a graph showing the change in static pressure of gas at the air outlet within a period of time after the fan system according to an embodiment of the present invention is turned on. DETAILED DESCRIPTION

[0051] The present invention is further described in detail below with reference to the accompanying drawings.

[0052] In the specification and claims of the present invention, terms indicating directions, such as "front", "rear", "up", "down", "left", "right", "side", "top", "bottom", etc., are used to describe various exemplary structural parts and elements of the present invention, but these terms are used here only for the purpose of convenience of description and are determined based on the exemplary orientations shown in the accompanying drawings. Since the embodiments disclosed in the present invention can be arranged in different directions, these terms indicating directions are only used as explanations and should not be regarded as limitations. For example, "up" and "down" are not necessarily limited to directions opposite to or consistent with the direction of gravity.

[0053] See also Figure 1-Figure 6 A self-cleaning range hood includes a body 10, a fan system 20 disposed in the body 10, and a cleaning device 30. The fan system 20 includes a volute 21 and an impeller 22 disposed in the volute 21, wherein the impeller 22 is driven to rotate by a motor to generate a negative pressure for sucking and exhausting oil smoke. The cleaning device 30 is used to spray cleaning liquid on the parts to be cleaned of the range hood to achieve the cleaning purpose.

[0054] See also Figure 1 The volute 21 has an air outlet 210, and the top plate of the body 10 is provided with an opening directly opposite to the air outlet 210 of the volute 21, and an air outlet cover is installed at the opening, wherein the air outlet cover is connected to the external flue through a smoke exhaust pipe, and a protective valve is provided at the connection position of the smoke exhaust pipe with the external flue. Figure 5 and Figure 6 As shown, during a period of time after the fan system 20 is started, that is, before the check valve 60 is opened, the speed and pressure will continue to increase, and after the check valve 60 is opened, the fan speed and the static pressure of the gas at the air outlet 210 will suddenly decrease.

[0055] An important invention of the present application is to utilize a period of time after the range hood fan is turned on, that is, before the check valve is opened, because the fan speed and the pressure at the air outlet 210 continue to increase, combined with the boosting device 40 that utilizes Pascal's law to achieve pressurization, to pressurize the gas and liquid in the pressurized container 31, and then utilize the characteristic that a large number of bubbles are precipitated due to the pressure reduction of the gas-liquid mixed fluid after being ejected (the solubility of air in the liquid decreases rapidly), to achieve micro-explosion cleaning of difficult-to-clean parts such as the impeller 22 and the volute 21.

[0056] The pressurized container 31 can be understood as a container for storing gas and liquid. Figure 2 The pressurized container 31 is provided with a pressurizing piston 32 for pressurizing the gas and liquid fluid entering therein. By applying pressure to the pressurizing piston 32, the internal space of the pressurized container 31 can be compressed, so that the solubility of the gas is greatly increased. Figure 2 The upper middle layer is air A1, and the lower layer is liquid A2, such as water or cleaning fluid.

[0057] The top of the pressurized container 31 has an air inlet 311 for external gas (which can be air) to enter therein and a liquid inlet 312 for external liquid (which can be provided by water in an external water tank or cleaning liquid) to enter therein. The pressurized container 31 also has a fluid outlet 313 for the gas-liquid mixed fluid formed by pressurization inside it to flow out. The fluid outlet 313 can extend to the impeller 22 of the fan (of course, it can also be other parts to be cleaned) through the injection pipe 33 to spray the gas-liquid mixed fluid to the fan impeller 22. Among them, the air inlet 311 is provided with a first control valve 53 for controlling the opening and closing of the air inlet 311. The liquid inlet 312 of the pressurized container 31 is provided with a second control valve 54 for controlling the opening and closing of the liquid inlet 312. The fluid outlet 313 of the pressurized container 31 is provided with a third control valve 55 for controlling the opening and closing of the fluid outlet 313.

[0058] After the gas-liquid mixed fluid in the pressurized container 31 is directly sprayed onto the surface of the part to be cleaned through the spray pipe 33, the rapid change in pressure after spraying can be used to precipitate the dissolved gas, generating micro-explosions to enhance the cleaning effect.

[0059] Only when the pressure in the pressurized container 31 reaches the set value can it be ensured that there is enough gas dissolved in the liquid. In order to detect and control the pressurization process of the gas-liquid fluid in the pressurized container 31, thereby ensuring the dissolution effect of the gas, the pressurized container 31 is also provided with a pressure sensor 34 for detecting the pressure change in the pressurized container 31. The pressure sensor 34 is also electrically connected to the controller.

[0060] See also Figure 2 , the boosting device 40 and the pressurized container 31 can be fixed inside the machine body 10. The boosting device 40 includes a boosting cylinder 41, a first piston member 42 and a second piston member 43, wherein the area of ​​the first piston member 42 is smaller than the area of ​​the second piston member 43, and correspondingly, a first channel for the first piston member 42 to slide back and forth and a second channel for the second piston member 43 to slide back and forth are formed in the boosting cylinder 41, and the cross section of the first channel is smaller than the cross section of the second channel. The first piston member 42 divides the boosting cylinder 41 into a ventilation chamber 411 and a boosting chamber 412, wherein the ventilation chamber 411 is connected to the air outlet 210 of the volute 21 through the air pipe 61, and the boosting chamber 412 is filled with an incompressible fluid. Specifically, the incompressible fluid is filled between the first piston member 42 and the second piston member 43. The second piston member 43 has a piston rod, which extends out of the boosting cylinder 41 and is connected to the pressurized piston member 32 of the pressurized container 31. The gas pressure exerted on the first piston member 42 in the ventilation chamber 411 can be transmitted to the second piston member 43 through the incompressible fluid, thereby driving the pressurizing piston member 32 to squeeze the fluid in the pressurizing container 31, thereby achieving the purpose of effective pressurization by utilizing Pascal's law.

[0061] The piston rod of the second piston member 43 is the power output shaft 431 of the boosting device 40 .

[0062] The ratio between the first channel and the second channel can be reasonably selected according to the required working pressure in the pressurized container 31 and the pressure at the air outlet 210 of the fan system 20 .

[0063] The ventilation chamber 411 is provided with a one-way control valve 51 and a pressure relief control valve 52, wherein the one-way control valve 51 allows the gas at the air outlet 210 of the volute 21 to enter the ventilation chamber 411 in one direction. The pressure relief control valve 52 can be used to relieve the pressure of the ventilation chamber 411, so as to realize the purpose of automatic washing and air suction of the pressurized container 31 by utilizing the negative pressure generated during the pressure relief process.

[0064] The one-way control valve 51, the pressure relief control valve 52, the first control valve 53, the second control valve 54, and the third control valve 55 of this embodiment are all electrically controlled valves, and each electrically controlled valve and the fan system 20 are electrically connected to the controller of the range hood. Therefore, after a cleaning cycle is completed, the air pressure in the ventilation chamber 411 is controlled by the corresponding control valve, so that the pressurized container 31 can be automatically replenished with liquid and air, so as to enter the next cleaning cycle in a timely and rapid manner.

[0065] This embodiment also relates to a control method for a self-cleaning range hood, comprising the following steps:

[0066] After the range hood enters the standby mode, the cleaning program can be performed by user operation or automatically, and it is generally preferred to be selected by user operation.

[0067] like Figure 3 As shown, the user can choose whether to execute the cleaning program. If yes, enter step S1. If not, it runs in normal mode. During the normal mode operation, the one-way control valve 51, the first control valve 53, the second control valve 54 and the third control valve 55 are all closed, and the user performs other operations such as air volume adjustment through the touch buttons.

[0068] S1, start cleaning mode;

[0069] S2, the one-way control valve 51 of the ventilation chamber 411 and the third control valve 55 of the pressurized container 31 are closed, the pressure relief control valve 52 of the ventilation chamber 411 and the second control valve 54 of the pressurized container 31 are opened, the first piston member 42, the second piston member 43 in the booster cylinder 41 and the pressurized piston member 32 in the pressurized container 31 move under the negative pressure of the ventilation chamber 41, the external liquid enters the pressurized container 31 through the liquid inlet 312, after waiting for the set time Δt1, the liquid in the pressurized container 31 is replenished, the second control valve 54 is controlled to be closed, and the first control valve 53 is opened, the external gas enters the pressurized container 31 through the gas inlet 311, after waiting for the set time Δt2, the gas in the pressurized container 31 is replenished, the first control valve 53 and the pressure relief control valve 52 are closed, and then the step S3 is entered;

[0070] S3, open the one-way control valve 51 of the ventilation chamber 411, start the fan system 20, introduce the high-pressure gas at the air outlet 210 of the volute 21 into the ventilation chamber 411, apply pressure to the first piston member 42, increase the pressure through the pressurization chamber 412, extend the second piston member 43, drive the pressurization piston member 32 in the pressurization container 31 to move, pressurize the gas-liquid mixed fluid entering the pressurization container 31, and then enter step S4;

[0071] S4, judging whether the pressure in the pressurized container 31 reaches the set pressure P0, if yes, the fan system 20 is switched to or maintained at the low gear, and then the third control valve 55 is opened to spray the pressurized gas-liquid mixed fluid onto the component to be cleaned, and then enter step S5, if no, enter step S6;

[0072] S5, after the spraying process continues for a set time, the third control valve 55 is closed, and a cleaning cycle ends. Then, whether to enter the next cleaning cycle is determined based on whether the set cleaning number n1 has been reached. If yes, return to step S2. If not, the one-way control valve 51, the pressure relief control valve 52, the first control valve 53, the second control valve 54 and the third control valve 55 are closed, and the fan continues to run for a set time to dry the residual liquid after cleaning, and the cleaning process ends.

[0073] S6, determining whether the current wind speed of the fan system 20 has reached the maximum wind speed, if yes, proceeding to step S7, if no, increasing the gear of the fan system 20, and then returning to step S4;

[0074] S7. Determine whether the speed of the fan system 20 suddenly decreases. If so, it means that the check valve 60 is open. Control the fan system 20 to stop rotating, wait for the set time for the valve plate of the check valve 60 to fall back, and return to step S3. If not, return to step S4.

[0075] In step S2, it is determined whether the liquid in the pressurized container 31 has been fully replenished by whether the opening time of the second control valve 54 has reached a set time, and it is determined whether the gas in the pressurized container 31 has been fully replenished by whether the opening time of the first control valve 53 has reached a set time. Of course, it is conceivable that the amount of liquid in the pressurized container 31 can also be identified by a liquid level sensor, and the air pressure in the pressurized container 31 can be detected by a pressure sensor 34 to identify whether the amount of gas entering the pressurized container 31 meets the requirement.

[0076] The control method of the self-cleaning range hood described above utilizes a period of time after the range hood fan is turned on, that is, before the check valve is opened, due to the continuous increase in the fan speed and the pressure at the air outlet 210, combined with the pressurization device 40 that uses Pascal's law to achieve pressurization, to pressurize the gas and liquid in the pressurized container 31, and then utilizes the characteristics of the gas-liquid mixed fluid that a large number of bubbles are precipitated due to the pressure reduction (the solubility of air in the liquid decreases rapidly) after being ejected, to achieve micro-explosion cleaning of the impeller 22, the volute 21 and other difficult-to-clean parts. On the other hand, the opening and falling rules of the range hood check valve 60 are also utilized to achieve intermittent pressurization of the gas-liquid fluid in the pressurized container 31, and on the basis of reducing the cleaning and use costs of the range hood as much as possible, to achieve effective cleaning of the range hood.

[0077] Of course, under normal circumstances, after the fan system 20 is started and starts to run for a period of time, the air pressure increases and the check valve 60 will open accordingly. After the check valve 60 is opened, due to the resistance of the external flue 63, the fan speed will drop suddenly and the pressure will drop rapidly. Therefore, the above-mentioned self-cleaning fume suction control process cannot provide a stable driving pressure for the boosting device 40. It is necessary to wait for the check valve 60 to fall back before continuing to pressurize the gas and liquid in the pressurized container 31. This makes the entire cleaning process of the range hood take relatively long.

[0078] To this end, the range hood of this embodiment is provided with a driving mechanism for controlling the opening and closing of the check valve 60. Specifically, the driving mechanism is an electromagnetic suction cup, that is, the valve plate of the check valve can be adsorbed or released by turning the electromagnetic suction cup on and off, thereby controlling the opening and closing of the valve plate of the check valve 60. The electromagnetic suction cup is also electrically connected to the controller of the range hood. The structure and working of the electromagnetic suction cup are prior art and will not be described in detail here.

[0079] Correspondingly, this embodiment also provides a control method for a range hood adapted to the opening and closing process of the active control check valve 60, which specifically includes the following steps:

[0080] After the range hood enters the standby mode, the cleaning program can be performed by user operation or automatically, and it is generally preferred to be selected by user operation.

[0081] like Figure 4 As shown, the user can choose whether to execute the cleaning program. If yes, enter step S1. If not, it runs in normal mode. During the normal mode operation, the one-way control valve 51, the first control valve 53, the second control valve 54 and the third control valve 55 are all closed, and the user performs other operations such as air volume adjustment through the touch buttons.

[0082] S1, start cleaning mode;

[0083] S2, judging whether the check valve 60 is in a closed state, if yes, proceeding to step S3, if no, closing the check valve 60 by the electromagnetic chuck, proceeding to step S3;

[0084] S3, the one-way control valve 51 of the ventilation chamber 411 and the third control valve 55 of the pressurized container 31 are closed, the pressure relief control valve 52 of the ventilation chamber 411 and the second control valve 54 of the pressurized container 31 are opened, the first piston member 42, the second piston member 43 in the booster cylinder 41 and the pressurized piston member 32 in the pressurized container 31 move under the negative pressure of the ventilation chamber 41, the external liquid enters the pressurized container 31 through the liquid inlet 312, after waiting for the set time Δt1, the liquid in the pressurized container 31 is replenished, the second control valve 54 is controlled to be closed, and the first control valve 53 is opened, the external gas enters the pressurized container 31 through the gas inlet 311, after waiting for the set time Δt2, the gas in the pressurized container 31 is replenished, the first control valve 53 and the pressure relief control valve 52 are closed, and then the process enters step S4;

[0085] S4, open the one-way control valve 51 of the ventilation chamber 411, start the fan system 20, introduce the high-pressure gas at the air outlet 210 of the volute 21 into the ventilation chamber 411, apply pressure to the first piston member 42, increase the pressure through the pressurization chamber 412, extend the second piston member 43, drive the pressurization piston member 32 in the pressurization container 31 to move, pressurize the gas-liquid mixed fluid entering the pressurization container 31, and then enter step S5;

[0086] S5, judging whether the pressure in the pressurized container 31 reaches the set pressure P0, if yes, the fan system 20 is switched to or maintained at the low gear, and then the third control valve 55 is opened to spray the pressurized gas-liquid mixed fluid onto the component to be cleaned, and then enter step S6, if no, enter step S7;

[0087] S6, after the spraying process continues for a set time, the third control valve 55 is closed, and a cleaning cycle ends. Then, whether to enter the next cleaning cycle is determined based on whether the set cleaning number n1 has been reached. If yes, return to step S3. If not, the one-way control valve 51, the pressure relief control valve 52, the first control valve 53, the second control valve 54 and the third control valve 55 are all closed, and the fan continues to run for a set time to dry the residual liquid after cleaning, and the cleaning process ends.

[0088] S7, determine whether the current wind speed of the fan system 20 reaches the maximum wind speed, if yes, return to step S5, if no, increase the gear of the fan system 20, and then return to step S5.

[0089] After the cleaning program is started, under the command of the control system, it is possible to first check whether the valve plate of the check valve 60 is in a closed state. If not, the check valve 60 can be immediately driven to close by the driving mechanism, and then the pressurization process can be started. By actively closing the check valve 60, there is no need to wait for the check valve 60 plate to fall back before the pressurization container 31 can be pressurized again as with a conventional check valve 60, thereby ensuring that the pressurization process of the pressurization container 31 can be carried out continuously, saving time in the entire cleaning process of the range hood.

Claims

1. A self-cleaning range hood, comprising: Body (10); A fan system (20) is disposed in the machine body (10), comprising a volute (21), wherein the volute (21) has an air outlet (210); A cleaning device (30) comprises a pressurized container (31), wherein the pressurized container (31) has an air inlet (311) for external gas to enter the container, a liquid inlet (312) for external liquid to enter the container, and a fluid outlet (313) for a gas-liquid mixed fluid pressurized inside the container to flow out; Features: The pressurized container (31) is provided with a pressurized piston (32) for pressurizing the gas or liquid fluid entering therein; Self-cleaning range hoods also include: A supercharging device (40) comprises a supercharging cylinder (41) and a power output shaft (431) telescopically arranged in the supercharging cylinder (41), wherein the supercharging cylinder (41) comprises a vent chamber (411) with adjustable volume and a supercharging chamber (412) independent of the vent chamber (411), wherein the vent chamber (411) and the supercharging chamber (412) are separated by a first piston member (42) which is reciprocatingly movable in the supercharging cylinder (41). The vent chamber (411) is connected to the air outlet (210) of the volute (21), and the pressurizing chamber (412) is filled with a non-compressible fluid medium, so that the pressure from the first piston member (42) is increased and transmitted to the power output shaft (431), and the power output shaft (431) is driven to extend, and the power output shaft (431) of the pressurizing device (40) is connected to the pressurizing piston member (32) in the pressurizing container (31); The boosting cylinder (41) is also provided with a second piston member (43) that can reciprocate, and the internal space in the boosting cylinder (41) corresponding to the space between the first piston member (42) and the second piston member (43) constitutes the boosting chamber (412), the area of ​​the first piston member (42) is smaller than the area of ​​the second piston member (43), and the piston rod of the second piston member (43) constitutes the power output shaft (431) of the boosting device (40); The ventilation chamber (411) is provided with a one-way control valve (51) for allowing gas at the air outlet (210) of the volute (21) to enter the ventilation chamber (411) in one direction, and a pressure relief control valve (52) for relieving pressure in the ventilation chamber (411); the air inlet (311) of the pressurized container (31) is provided with a first control valve (53) for controlling the opening and closing of the air inlet (311); the liquid inlet (312) of the pressurized container (31) is provided with a second control valve (54) for controlling the opening and closing of the liquid inlet (312); and the fluid outlet (313) of the pressurized container (31) is provided with a third control valve (55) for controlling the opening and closing of the fluid outlet (313); The one-way control valve (51), the pressure relief control valve (52), the first control valve (53), the second control valve (54), the third control valve (55) and the fan system (20) are all electrically connected to the controller of the range hood.

2. The self-cleaning range hood according to claim 1, characterized in that: The fluid outlet (313) of the pressurized container (31) is connected to a spray pipe (33) for drawing out the gas-liquid mixed fluid formed after pressurization and spraying it onto the parts to be cleaned of the range hood.

3. The self-cleaning range hood according to claim 2, characterized in that: The part of the range hood to be cleaned is the volute (21) of the fan system (20) or the impeller (22) arranged in the volute (21).

4. The self-cleaning range hood according to claim 1, characterized in that: It also includes a pressure sensor (34) for detecting the pressure in the pressurized container (31), and the pressure sensor (34) is also electrically connected to the controller.

5. The self-cleaning range hood according to claim 4, characterized in that: It also includes a check valve (60) disposed at the air outlet (210) of the range hood or in a flow channel downstream of the air outlet (210), and a drive mechanism for controlling the opening and closing of the check valve (60).

6. A control method for a self-cleaning range hood as claimed in claim 4, characterized in that The following steps are involved: S1, start cleaning mode; S2, the one-way control valve (51) of the ventilation chamber (411) and the third control valve (55) of the pressurized container (31) are closed, the pressure relief control valve (52) of the ventilation chamber (411) and the second control valve (54) of the pressurized container (31) are opened, and the first piston member (42) and the second piston member (43) in the booster cylinder (41) and the pressurizing piston member (32) in the pressurized container (31) move downward under the negative pressure of the ventilation chamber (411). The pressure relief control valve (52) is opened, and the pressure relief control valve (52) is closed. The pressure relief control valve (52) is closed, and the pressure relief control valve (52) is closed. The pressure relief control valve (52) is closed, and the pressure relief control valve (52) is closed. The pressure relief control valve (52) is closed, and the pressure relief control valve (52) is closed. S3, opening the one-way control valve (51) of the ventilation chamber (411), starting the fan system (20), introducing the high-pressure gas at the air outlet (210) of the volute (21) into the ventilation chamber (411), applying pressure to the first piston member (42), increasing the pressure through the pressurizing chamber (412), extending the second piston member (43), driving the pressurizing piston member (32) in the pressurizing container (31) to move, pressurizing the gas-liquid mixed fluid entering the pressurizing container (31), and then entering step S4; S4, determining whether the pressure in the pressurized container (31) reaches the set pressure P0; if so, the fan system (20) is switched to or maintained at a low gear, and then the third control valve (55) is opened to spray the pressurized gas-liquid mixed fluid onto the component to be cleaned, and then proceeding to step S5; if not, proceeding to step S6; S5, after the spraying process continues for a set time, the third control valve (55) is closed, and a cleaning cycle ends. Then, it is determined whether to enter the next cleaning cycle. If yes, it returns to step S2. If not, the one-way control valve (51), the pressure relief control valve (52), the first control valve (53), the second control valve (54) and the third control valve (55) are all closed, and the fan system (20) is closed after running for a set time, and the cleaning process ends. S6, determining whether the current wind speed of the fan system (20) has reached the maximum wind speed, if yes, proceeding to step S7, if no, increasing the gear of the fan system (20), and then returning to step S4; S7, determining whether the rotation speed of the fan system (20) is suddenly reduced, if so, controlling the fan system (20) to stop rotating, waiting for a set time, and returning to step S3; if not, returning to step S4.

7. The control method of the self-cleaning range hood according to claim 6, characterized in that: In step S2, whether the liquid in the pressurized container (31) has been fully replenished is determined by whether the opening time of the second control valve (54) has reached a set time length, and whether the gas in the pressurized container (31) has been fully replenished is determined by whether the opening time of the first control valve (53) has reached a set time length.

8. A control method for a self-cleaning range hood as claimed in claim 5, characterized in that The following steps are involved: S1, start cleaning mode; S2, determining whether the check valve (60) is in a closed state, if yes, proceeding to step S3, if no, closing the check valve (60), and proceeding to step S3; S3, the one-way control valve (51) of the ventilation chamber (411) and the third control valve (55) of the pressurized container (31) are closed, the pressure relief control valve (52) of the ventilation chamber (411) and the second control valve (54) of the pressurized container (31) are opened, and the first piston member (42) and the second piston member (43) in the booster cylinder (41) and the pressurizing piston member (32) in the pressurized container (31) move downward under the negative pressure of the ventilation chamber (411). The pressure relief control valve (52) is opened, and the pressure relief control valve (52) is closed. The pressure relief control valve (52) is closed, and the pressure relief control valve (52) is closed. The pressure relief control valve (52) is closed, and the pressure relief control valve (52) is closed. The pressure relief control valve (52) is closed, and the pressure relief control valve (52) is closed. S4, opening the one-way control valve (51) of the ventilation chamber (411), starting the fan system (20), introducing the high-pressure gas at the air outlet (210) of the volute (21) into the ventilation chamber (411), applying pressure to the first piston member (42), increasing the pressure through the pressurizing chamber (412), extending the second piston member (43), driving the pressurizing piston member (32) in the pressurizing container (31) to move, pressurizing the gas-liquid mixed fluid entering the pressurizing container (31), and then entering step S5; S5, determining whether the pressure in the pressurized container (31) reaches the set pressure P0; if so, the fan system (20) is switched to or maintained at a low gear, and then the third control valve (55) is opened to spray the pressurized gas-liquid mixed fluid onto the component to be cleaned, and then proceeding to step S6; if not, proceeding to step S7; S6, after the spraying process continues for a set time, the third control valve (55) is closed, and a cleaning cycle ends. Then, it is determined whether to enter the next cleaning cycle. If yes, it returns to step S3. If not, the one-way control valve (51), the pressure relief control valve (52), the first control valve (53), the second control valve (54) and the third control valve (55) are all closed, and the fan system (20) is closed after running for a set time, and the cleaning process ends. S7, determining whether the current wind speed of the fan system (20) has reached the maximum wind speed, if yes, returning to step S5, if no, increasing the gear of the fan system (20), and then returning to step S5.

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