A cleaning method and cleaning structure of range hood

Abstract

The present invention relates to a cleaning method and cleaning structure of a range hood. According to the characteristics of foam cleaning, a large amount of foam is first evenly covered on the impeller at a low speed of the impeller, and the low speed cleaning is maintained for a certain period of time. During this period of time, the foam infiltrates and decomposes the oil stains on the impeller, and a part of the foam is consumed; then the impeller speed is stepped up, so that the foam on the impeller is gradually evenly distributed on the inner wall of the volute, thereby infiltrating and decomposing the inner wall of the volute; then the impeller and the inner wall of the volute are rinsed at a low speed with less water to absorb the residual detergent, and finally the impeller is highly rotated and dried to avoid water erosion of the impeller. During the cleaning process, the foam is always kept in a flowing state and completely covers the impeller, so as to fully infiltrate and decompose the oil stains. The cleaning of the inner wall of the volute also keeps the foam infiltrating into various areas of the inner wall of the volute, which is conducive to fully decomposing the oil stains by using the foam tension, and then removing them by water flushing, thereby effectively improving the cleaning effect.

Description

Technical Field

[0001] The invention relates to the technical field of range hood cleaning, and in particular to a range hood cleaning method and a cleaning structure. Background Art

[0002] A range hood is a household appliance used to extract oil fumes generated by cooking on the stove. However, one of the biggest problems with most range hoods is that the volatilized oil fumes will condense inside the range hood, and the oil will mix with impurities such as dust and particles to form thick and difficult-to-clean oil scale inside the range hood. When the oil scale accumulates to a certain extent, a dense solidified layer will form inside the range hood, further increasing the difficulty of cleaning.

[0003] In the past, range hoods usually needed to be disassembled and cleaned. Some range hoods in the prior art already have a self-cleaning function. For example, the Chinese invention patent "Ranger Hood" with authorization announcement number CN103732994B (application number: CN201280039582.3) and the Chinese invention patent "Ranger Hood" with authorization announcement number CN101495814B (application number: CN200780027956.9) all disclose range hoods with a self-cleaning function. These range hoods are equipped with cleaning agent containers, pumps, spray ports and other components inside the device to spray cleaning agent on blades, flow channels, filters and other components, and remove residual liquid after cleaning. In the prior art, the cleaning medium of this type of structure is generally a single cleaning medium such as steam (or water mist) or water. When water is used as the cleaning medium, not only is a large amount of water used, but also the water temperature is generally low, making it difficult to clean thoroughly. If steam is used as the cleaning medium, the steam can adhere to the surface of the oil stain and easily dissolve the oil stain. However, since the steam that has dissolved the oil stain is difficult to flow down from the object to be cleaned, it is also difficult to achieve a good cleaning effect.

[0004] In the prior art, foam is also used to clean the impeller and volute, but the tension and other properties of foam and liquids such as water are different. The existing cleaning method often affects the infiltration of foam into oil stains due to the impeller rotating too fast, or the impeller cannot fully contact with the foam, affecting the cleaning effect. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a range hood cleaning method which can improve the cleaning effect by reasonably controlling the contact time and flow rate between foam and oil stains in view of the current status of the prior art.

[0006] Another technical problem to be solved by the present invention is to provide a cleaning structure of a range hood that can generate foam and facilitates controlling the contact time and flow rate between the foam and oil stains in view of the current status of the prior art.

[0007] The technical solution adopted by the present invention to solve the above technical problem is: a method for cleaning a range hood, characterized in that it comprises the following steps:

[0008] (1) The impeller is rotated at a low speed, and the detergent is evenly covered on the impeller in the form of foam and rotates with the impeller at a low speed. The foam is continuously supplied for 20 to 60 seconds and then stopped;

[0009] (2) The impeller keeps running at a low speed for 10 to 15 minutes. During this process, the dissolved oil flows into the oil receiving tank along the flow channel of the range hood;

[0010] (3) The impeller is accelerated in a stepwise manner, with the maximum speed not exceeding 300 rpm, and the entire acceleration process is completed within 1 to 4 minutes. During this process, the foam on the impeller is thrown onto the inner wall of the volute and / or the filter screen by the gradually increasing centrifugal force, thereby infiltrating and cleaning the inner wall of the volute and / or the filter screen;

[0011] (4) Adjust the impeller to a low speed and keep it running at a low speed, spray water on the impeller, and wash the impeller and the inner wall of the volute and / or the filter screen with the washing liquid and the decomposed oil, and the dirt flows back to the oil receiving tank through the flow channel;

[0012] (5) Adjust the impeller to high speed and keep it running at high speed, keep the speed above 1550 rpm, and after the residual solvent and water on the impeller are dried, stop the impeller.

[0013] Preferably, the rotation speed of the low-speed operation in step (1) is 20 to 30 rpm, more preferably 25 rpm. Such rotation is mainly used to ensure that the foam continuously covers the impeller and does not fall from the impeller to the inner bottom wall of the volute.

[0014] Preferably, the washing liquid in step (1) contains a weak alkaline solvent and / or an emulsifier and / or a melting agent and / or a surfactant. The weak alkaline solvent and / or an emulsifier and / or a melting agent and / or a surfactant are common substances in the prior art, and are mainly used to accelerate the dissolution of oil stains by foam.

[0015] As an improvement, the step-by-step speed increase in step (3) at least includes the process of 20-30 rpm → 50-70 rpm → 100-140 rpm → 200-280 rpm. Preferably, the step-by-step speed increase in step (3) is the process of 25 rpm → 60 rpm → 120 rpm → 240 rpm. If the step-by-step speed increase is not adopted, the foam is easily concentrated and thrown to a certain area of ​​the inner wall of the volute. The above process of the present invention is mainly to make the foam on the impeller gradually and evenly thrown to the inner wall of the volute under the action of centrifugal force, so as to fully infiltrate and decompose the oil stains on the inner wall of the volute.

[0016] Preferably, the rotation speed of the low-speed operation in step (4) is 20 to 30 rpm. This step mainly uses a small amount of water to clean the washing liquid remaining on the impeller and the inner wall of the volute.

[0017] A cleaning structure used in the above-mentioned range hood cleaning method includes a volute, an impeller, a motor and a cleaning assembly. The impeller is rotatably arranged in the volute, and the motor is used to drive the impeller to rotate. It is characterized in that: the cleaning assembly includes a nozzle that can extend into the volute and the output end is arranged toward the impeller.

[0018] For ease of control, the cleaning component also includes a water supply structure, a washing liquid supply structure and a power structure. The water supply structure and the washing liquid supply structure are connected to the nozzle through a three-way valve. The power structure is arranged on the connecting pipeline between the three-way valve and the nozzle and provides power for the delivery of water / washing liquid.

[0019] Preferably, the cleaning component further comprises a self-excited vibration sound generator capable of homogenizing the concentration of the fluid in the pipeline, and the self-excited vibration sound generator is arranged on the pipeline downstream of the power structure and close to the power structure. Since the washing liquid is easy to settle after being left for a period of time, the above structure can make the output washing liquid concentration uniform and keep the impeller delivering a stable amount of foam.

[0020] For ease of control, the cleaning component also includes a first valve and a second valve. The first valve is arranged on the pipeline between the water supply structure and the three-way valve and is used to control the supply of water. The second valve is arranged on the pipeline between the washing liquid supply structure and the three-way valve and is used to control the supply of washing liquid.

[0021] In the above preferred embodiments, the nozzle includes a liquid inlet section and a diffusion section, the output end of the liquid inlet section is connected to the input end of the diffusion section, the inner diameter of the diffusion section gradually increases from the input end to the output end, a partition is provided at the connection between the output end of the liquid inlet section and the input end of the diffusion section, the middle of the partition is provided with an impact port for liquid to pass through and increase the liquid flow rate, and a filter screen is provided at the output end of the diffusion section to impact the output liquid so that bubbles are entrained in the output liquid. With such a structure, when the liquid passes through the partition, the liquid flow rate increases rapidly due to the sharp reduction of the liquid outlet, and the liquid impacts the filter screen at a larger flow rate. Since the outside of the filter screen is air, the liquid will produce cavitation, forming a large number of bubbles in the liquid. For detergent, a large amount of foam will be generated, and for water, the amount of bubbles carried in the water will increase, thereby improving the degree of water stripping of oil stains.

[0022] Preferably, the inner diameter of the front section of the impact port is consistent, and the inner diameter of the rear section of the impact port gradually increases along the liquid output direction. The impact port on the partition plate causes the liquid flow rate to increase sharply, which is easy to cause liquid turbulence. The above structure can guide the output direction of the fluid to a certain extent, avoid liquid turbulence, and improve the stability of liquid output.

[0023] As an improvement, a contraction section extending along the axial direction of the diffusion section and having a gradually decreasing inner diameter is provided at the output end of the diffusion section. Preferably, the angle between the peripheral wall of the contraction section and the filter screen is 40 to 50 degrees, and the length of the contraction section in the axial direction is 5 to 10 mm. If the above-mentioned contraction section is not provided, the oil fume flow of the flue will enter the diffusion section along the outer wall of the nozzle, which may easily cause the nozzle to be blocked. However, with the above-mentioned structure, the oil fume flow forms a vortex at the outer wall of the contraction section after passing through the diffusion section, and leaves, thus avoiding nozzle blockage.

[0024] Compared with the prior art, the advantages of the present invention are as follows: according to the characteristics of foam cleaning, the present invention firstly makes a large amount of foam evenly cover the impeller under the low speed state of the impeller, and keeps the low speed cleaning for a certain period of time, during which the foam infiltrates and decomposes the oil stains on the impeller, and consumes part of the foam; then the impeller speed is stepped up, so that the foam on the impeller is gradually evenly distributed on the inner wall of the volute, thereby infiltrating and decomposing the inner wall of the volute; then the impeller and the inner wall of the volute are rinsed at a low speed with less water to absorb the residual detergent, and finally the impeller is highly rotated to dry, so as to avoid water erosion of the impeller. The present invention keeps the foam in a flowing state and completely covers the impeller during the entire cleaning process of the impeller, so as to fully infiltrate and decompose the oil stains, and the cleaning of the inner wall of the volute also keeps the foam infiltrating into various areas of the inner wall of the volute, which is conducive to fully decomposing the oil stains by using the foam tension, and then removing them by water flushing, effectively improving the cleaning effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the structure of a cleaning component in an embodiment of the present invention;

[0026] Figure 2 for Figure 1 Schematic diagram of the structure of the middle nozzle;

[0027] Figure 3 Schematic diagram of the coordination structure of the fan and the nozzle in an embodiment of the present invention. DETAILED DESCRIPTION

[0028] The present invention is further described in detail below with reference to the accompanying drawings.

[0029] Embodiment 1:

[0030] The cleaning method of the range hood of this embodiment comprises the following steps:

[0031] (1) the impeller is rotated at a low speed of 25 revolutions per minute, the washing liquid is uniformly covered on the impeller in the form of foam and rotates with the impeller at a low speed of 25 revolutions per minute, and the foam is continuously supplied for 30 seconds and then stopped; the washing liquid contains a weak alkaline solvent, an emulsifier, a melting agent, and a surfactant;

[0032] (2) The impeller is kept running at a low speed of 25 rpm for 10 to 15 minutes. During this process, the dissolved oil flows into the oil receiving tank along the flow channel of the range hood;

[0033] (3) The impeller is accelerated step by step, so that the impeller speed gradually transitions from 25 rpm → 60 rpm → 120 rpm → 240 rpm, and the entire speed-up process is completed within 2 minutes. During this process, the foam on the impeller is thrown onto the inner wall of the volute and the filter screen by the gradually increasing centrifugal force, thereby infiltrating and cleaning the inner wall of the volute and the filter screen;

[0034] (4) Adjust the impeller to a low speed of 25 rpm and keep it running at a low speed. Spray water on the impeller. The water will flush the impeller, the inner wall of the volute, the cleaning liquid and the decomposed oil on the filter screen. The dirt will flow back to the oil receiving tank through the flow channel. The water flushing process will last for 2 minutes.

[0035] (5) Adjust the impeller to high speed and keep it running at high speed, keeping the speed at 1700 rpm. After the residual solvent and water on the impeller are dried, the impeller stops running.

[0036] like Figures 1 to 3 As shown, the cleaning structure used in the cleaning method of the range hood in this embodiment includes a volute 1, an impeller 2, a motor and a cleaning assembly 3. The impeller 2 is rotatably disposed in the volute 1, and the motor is used to drive the impeller 2 to rotate.

[0037] The cleaning assembly 3 includes a nozzle 31, a water supply structure 32, a detergent supply structure 33, a power structure 34, a self-excited vibration sounder 35, a first valve 36 and a second valve 37. The nozzle 31 extends into the volute 1 and the output end is arranged toward the impeller 2. The water supply structure 32 and the detergent supply structure 33 are both tanks that can store liquids. The water supply structure 32 and the detergent supply structure 33 are connected to the nozzle 31 through a three-way valve 38. The power structure is a water pump, which is arranged on the connecting pipeline of the three-way valve 38 and the nozzle 31 and provides power for the transportation of water and detergent. The self-excited vibration sounder 35 is used to homogenize the fluid concentration in the pipeline. The self-excited vibration sounder 35 is arranged on the pipeline downstream of the power structure 34 and is arranged close to the power structure 34. Since the detergent is easy to precipitate after being placed for a period of time, the above structure can make the output detergent concentration uniform and keep the impeller to transport a stable amount of foam. The first valve 36 is arranged on the pipeline between the water supply structure 32 and the three-way valve 38 and is used to control the supply of water. The second valve 37 is arranged on the pipeline between the washing liquid supply structure 33 and the three-way valve 38 and is used to control the supply of washing liquid.

[0038] The nozzle 31 of this embodiment includes a liquid inlet section 311 and a diffuser section 312. The output end of the liquid inlet section 311 is connected to the input end of the diffuser section 312. The inner diameter of the diffuser section 312 gradually increases from the input end to the output end. A partition 313 is provided at the connection between the output end of the liquid inlet section 311 and the input end of the diffuser section 312. An impact port 314 is provided in the middle of the partition 313 for liquid to pass through and increase the liquid flow rate. The inner diameter of the front section of the impact port 314 is consistent, and the inner diameter of the rear section of the impact port 314 gradually increases along the liquid output direction. A filter screen 315 is provided at the output end of the diffuser section 312 to impact the output liquid so that bubbles are entrained in the output liquid. When the liquid passes through the partition 313, the liquid outlet is sharply reduced, so that the liquid flow rate increases rapidly, and the liquid impacts the filter 315 at a relatively high flow rate. Since the outside of the filter 315 is air, the liquid will produce cavitation, forming a large number of bubbles in the liquid. For detergents, a large amount of foam will be produced, and for water, the amount of bubbles carried in the water will increase, and the degree of water stripping of oil stains will be improved. The impact port on the partition 313 causes the liquid outlet flow rate to increase sharply, which is easy to cause liquid turbulence. The impact port 314 plays a guiding role in the output direction of the fluid to a certain extent, which can avoid liquid turbulence and improve the stability of liquid output.

[0039] The output end of the diffuser section 312 is provided with a contraction section 316 extending along the axial direction of the diffuser section 312 and having a gradually decreasing inner diameter. The angle a between the peripheral wall of the contraction section 316 and the filter screen 315 is 40 to 50 degrees, and the length of the contraction section 316 in the axial direction is 5 to 10 mm. If the contraction section 316 is not provided, the oil smoke flow of the flue will enter the diffuser section 312 along the outer wall of the nozzle 31, which may easily cause the nozzle 31 to be blocked. However, with the above structure, the oil smoke flow forms a vortex at the outer wall of the contraction section 316 after passing through the diffuser section 312 and leaves, thus avoiding the blockage of the nozzle 31.

[0040] Embodiment 2:

[0041] The cleaning method of the range hood of this embodiment comprises the following steps:

[0042] (1) The impeller is rotated at a low speed of 20 revolutions per minute, and the washing liquid is uniformly covered on the impeller in the form of foam and rotates with the impeller at a low speed of 20 revolutions per minute, and the foam is continuously supplied for 20 seconds and then stopped; the washing liquid contains a weak alkaline solvent, an emulsifier, a melting agent, and a surfactant;

[0043] (2) The impeller is kept running at a low speed of 20 rpm for 10 to 15 minutes. During this process, the dissolved oil flows into the oil receiving tank along the flow channel of the range hood;

[0044] (3) The impeller is accelerated step by step, so that the impeller speed gradually transitions from 20 rpm → 50 rpm → 100 rpm → 200 rpm, and the entire speed-up process is completed within 4 minutes. During this process, the foam on the impeller is thrown onto the inner wall of the volute and the filter screen by the gradually increasing centrifugal force, thereby infiltrating and cleaning the inner wall of the volute and the filter screen;

[0045] (4) Adjust the impeller to a low speed of 20 rpm and keep running at a low speed. Spray water on the impeller. The water washes the impeller, the inner wall of the volute, the cleaning liquid and the decomposed oil on the filter screen. The dirt flows back to the oil receiving tank through the flow channel. The water washing process lasts for 3 minutes.

[0046] (5) Adjust the impeller to high speed and keep it running at high speed, keeping the speed at 1550 rpm, and after the residual solvent and water on the impeller are dried, the impeller stops running.

[0047] Embodiment 3:

[0048] The cleaning method of the range hood of this embodiment comprises the following steps:

[0049] (1) the impeller is rotated at a low speed of 30 revolutions per minute, the washing liquid is uniformly covered on the impeller in the form of foam and rotates with the impeller at a low speed of 30 revolutions per minute, and the foam is continuously supplied for 20 seconds and then stopped; the washing liquid contains a weak alkaline solvent, an emulsifier, a melting agent, and a surfactant;

[0050] (2) The impeller is kept running at a low speed of 30 rpm for 10 to 15 minutes. During this process, the dissolved oil flows into the oil receiving tank along the flow channel of the range hood;

[0051] (3) The impeller is accelerated step by step, so that the impeller speed gradually transitions from 30 rpm → 70 rpm → 140 rpm → 280 rpm, and the entire speed-up process is completed within 1 minute. During this process, the foam on the impeller is thrown onto the inner wall of the volute and the filter screen by the gradually increasing centrifugal force, thereby infiltrating and cleaning the inner wall of the volute and the filter screen;

[0052] (4) Adjust the impeller to a low speed of 30 rpm and keep running at a low speed. Spray water on the impeller. The water washes the impeller, the inner wall of the volute, the cleaning liquid and the decomposed oil on the filter screen. The dirt flows back to the oil receiving tank through the flow channel. The water washing process lasts for 2 minutes.

[0053] (5) Adjust the impeller to high speed and keep it running at high speed, keeping the speed at 1700 rpm. After the residual solvent and water on the impeller are dried, the impeller stops running.

Claims

1. A method for cleaning a range hood, characterized in that: The following steps are included (1) The impeller is rotated at a low speed. The detergent is evenly covered on the impeller in the form of foam and rotates with the impeller at a low speed. The foam is continuously supplied for 20 to 60 seconds and then stopped. (2) The impeller keeps running at a low speed for 10 to 15 minutes. During this process, the dissolved oil flows into the oil receiving tank along the flow channel of the range hood. (3) The impeller is accelerated in a stepwise manner, with the maximum speed not exceeding 300 rpm, and the entire acceleration process is completed within 1 to 4 minutes. During this process, the foam on the impeller is thrown onto the inner wall of the volute and / or the filter screen by the gradually increasing centrifugal force, thereby infiltrating and cleaning the inner wall of the volute and / or the filter screen; (4) Adjust the impeller to a low speed and keep it running at a low speed, spray water on the impeller, and the water will wash the washing liquid and decomposed oil on the impeller and the inner wall of the volute and / or the filter screen, and the dirt will flow back to the oil receiving tank through the flow channel; (5) Adjust the impeller to high speed and keep it running at high speed, keeping the speed above 1550 rpm. After the residual solvent and water on the impeller are dried, the impeller stops running.

2. The range hood cleaning method according to claim 1, characterized in that: The rotation speed of the low-speed operation in step (1) is 20 to 30 rpm.

3. The method for cleaning a range hood according to claim 1, characterized in that: The rotation speed of the low-speed operation in step (1) is 25 rpm.

4. The method for cleaning a range hood according to claim 1, characterized in that: The washing liquid in step (1) contains a weak alkaline solvent and / or an emulsifier and / or a solubility enhancer and / or a surfactant.

5. The range hood cleaning method according to claim 1, characterized in that: The step-by-step speed increase in step (3) at least includes the process of 20 to 30 rpm → 50 to 70 rpm → 100 to 140 rpm → 200 to 280 rpm.

6. The range hood cleaning method according to claim 5, characterized in that: The stepwise speed increase in step (3) is a process of 25 rpm → 60 rpm → 120 rpm → 240 rpm.

7. The range hood cleaning method according to claim 1, characterized in that: The rotation speed of the low-speed operation in step (4) is 20 to 30 rpm.

8. A cleaning device used in the range hood cleaning method according to any one of claims 1 to 7, comprising a volute (1), an impeller (2), a motor and a cleaning assembly (3), wherein the impeller (2) is rotatably arranged in the volute (1), and the motor is used to drive the impeller (2) to rotate, characterized in that: The cleaning assembly (3) comprises a nozzle (31) which can be inserted into the volute (1) and the output end of which is arranged toward the impeller (2); The cleaning component (3) further comprises a water supply structure (32), a washing liquid supply structure (33) and a power structure (34); the water supply structure (32) and the washing liquid supply structure (33) are connected to the nozzle (31) via a three-way valve (38); the power structure (34) is arranged on the connecting pipeline between the three-way valve (38) and the nozzle (31) and provides power for the transportation of water / washing liquid; The cleaning component (3) further comprises a self-excited vibration sound generator (35) capable of homogenizing the concentration of the fluid in the pipeline, wherein the self-excited vibration sound generator (35) is arranged on the pipeline downstream of the power structure (34) and close to the power structure (34); The nozzle (31) comprises a liquid inlet section (311) and a diffuser section (312); the output end of the liquid inlet section (311) is connected to the input end of the diffuser section (312); the inner diameter of the diffuser section (312) gradually increases from the input end to the output end; a partition (313) is provided at the connection between the output end of the liquid inlet section (311) and the input end of the diffuser section (312); an impact port (314) is provided in the middle of the partition (313) for allowing liquid to pass through and increasing the flow rate of the liquid; a filter (315) is provided at the output end of the diffuser section (312) for impacting the output liquid so that bubbles are entrained in the output liquid; The inner diameter of the front section of the impact port (314) is consistent from front to back, and the inner diameter of the rear section of the impact port (314) gradually increases along the liquid output direction; A contraction section (316) extending along the axial direction of the diffuser section (312) and having a gradually decreasing inner diameter is provided at the output end of the diffuser section (312).

9. The cleaning device according to claim 8, characterized in that: The cleaning component (3) further comprises a first valve (36) and a second valve (37); the first valve (36) is arranged on the pipeline between the water supply structure (32) and the three-way valve (38) and is used to control the supply of water; the second valve (37) is arranged on the pipeline between the washing liquid supply structure (33) and the three-way valve (38) and is used to control the supply of washing liquid.

10. The cleaning device according to claim 8, characterized in that: The angle between the peripheral wall of the contraction section (316) and the filter screen (315) is 40 to 50 degrees, and the length of the contraction section (316) in the axial direction is 5 to 10 mm.

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