An oil fume exhaust equipment with a fan system cleaning function and a cleaning method

Abstract

The present application belongs to the technical field of oil fume exhaust products, and particularly relates to an oil fume exhaust equipment with a fan system cleaning function and a cleaning method. The oil fume exhaust equipment comprises a fan system for exhausting oil fume, the fan system comprising a volute and a first impeller installed in the volute and capable of rotating along a rotation shaft to exhaust oil fume; a hot air device is installed on the outer side wall of the volute, the hot air device is provided with a hot air cavity, the air inlet of the hot air cavity faces the outside of the volute, the installation end of the hot air cavity penetrates through the outer side wall of the volute and extends to the inside of the volute, so that the air outlet of the hot air cavity faces the outer peripheral wall of the first impeller; a cleaning fan for exhausting hot air is arranged on the side close to the air inlet in the hot air cavity, and a high-temperature heating element for heating to form hot air with a temperature of not less than 200 DEG C is further arranged on the side close to the air outlet in the hot air cavity. The oil fume exhaust equipment has higher cleanliness, faster cleaning rate, and therefore better cleaning effect, and does not need to be waterproofed, so that the implementation cost is greatly reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of oil fume exhaust products, and in particular to an oil fume exhaust device with a fan system cleaning function and a cleaning method. Background Art

[0002] Currently, the automatic cleaning methods for fan systems in range hoods (such as range hoods and integrated stoves) on the market primarily include water cleaning, steam cleaning, and autoclave cleaning. These cleaning methods all suffer from the drawback of operating at too low a temperature, making them ineffective against fan systems that haven't been cleaned for extended periods. Grease is a highly adhesive, gel-like substance, so even the 100°C steam used in steam cleaning has difficulty melting it and removing it from the fan system. Therefore, these cleaning methods are largely ineffective against grease, especially grease that has been adhering to the fan system for extended periods.

[0003] In addition, there are also hot melt cleaning methods using volute heating in the prior art, such as the hot air blowing cleaning system for range hoods provided by publication number CN107321716A. This hot air blowing cleaning system uses an electric heating device to heat the cleaning fan inlet air to 50-80 degrees under the action of the cleaning fan to form hot air, and then blows the hot air into the inner side of the impeller. The hot air is driven by the rotation of the impeller to circulate the hot air, so that the entire interior of the range hood is heated, and the oil stains are softened, vaporized, and liquefied, and the hot air cleaning is performed. However, this hot air blowing cleaning system can only provide hot air at 50-80 degrees, which is still too low. In particular, it has almost no cleaning effect on grease that has been adhered to the fan system for a long time. Moreover, the air outlet of the hot air blowing port is close to the inner side of the impeller blades, which easily causes the hot air to be blocked by the rotating impeller blades and difficult to spread quickly and clean the inner wall of the body. Therefore, the cleaning effect of this hot air blowing cleaning system is poor. Summary of the Invention

[0004] One of the purposes of the present invention is to provide an oil fume exhaust device with a fan system cleaning function, the oil fume exhaust device has an air washing cleaning function, can achieve fast and efficient cleaning, and improve the cleaning effect.

[0005] A second object of the present invention is to provide a method for cleaning an oil fume exhaust device with a fan system cleaning function, so as to further improve its cleaning effect.

[0006] Based on this, the present invention discloses an oil fume exhaust device with a fan system cleaning function, including a fan system for extracting oil fumes, the fan system including a volute and a first impeller installed in the volute and capable of rotating along its rotating axis to extract oil fumes; a hot air device is installed on the outer wall of the volute, and the hot air device is provided with a hot air cavity, the air inlet of the hot air cavity faces the outside of the volute, and the installation end of the hot air cavity passes through the outer wall of the volute and extends to the inside of the volute, so that the air outlet of the hot air cavity faces the outer peripheral wall of the first impeller; a cleaning fan for exhausting hot air is provided on the side near the air inlet in the hot air cavity, and a high-temperature heating element for heating to form hot air of not less than 200°C is also provided on the side near the air outlet in the hot air cavity.

[0007] Preferably, the hot air cavity is trumpet-shaped, and the equivalent diameter of the air inlet of the hot air cavity is larger than the equivalent diameter of the air outlet of the hot air cavity.

[0008] Further preferably, the cleaning blower is provided with a second impeller for exhausting hot air; and the wind speed at the air outlet of the hot air chamber is not less than 6 m / s.

[0009] Preferably, a heating wire is provided in the high-temperature heating element for heating to form hot air at a temperature of not less than 200°C.

[0010] Further preferably, the hot air temperature at the air outlet of the hot air chamber is 200-300°C.

[0011] Preferably, a one-way valve is provided at the communication position between the mounting end of the hot air chamber and the volute to prevent the hot air from flowing back.

[0012] Preferably, the wind direction of the air outlet of the hot air chamber is consistent with the tangent direction of the arc blades of the first impeller, so as to ensure that both sides of the arc blades of the first impeller can fully contact the hot air.

[0013] Preferably, the hot air device is a hot air gun.

[0014] The present invention also discloses a method for cleaning an oil fume exhaust device having a fan system cleaning function, comprising the following cleaning steps:

[0015] Step S1: driving the first impeller to rotate and starting the hot air device to continuously discharge hot air at a temperature of not less than 200° C. from the air outlet of the hot air chamber, so that the hot air is reflected onto the inner surface of the volute under the rotation of the first impeller, so that the grease on the surface of the first impeller and the volute is dried and melted by the hot air;

[0016] Step S2: After the hot air is continuously discharged for a period of time in step S1, the cleaning fan is driven to work intermittently, so that the air outlet of the hot air chamber intermittently discharges hot air of not less than 200° C. to remove the grease.

[0017] Preferably, after the hot air is intermittently discharged for a period of time in step S2, the following cleaning step is also included: step S3, the rotation speed of the first impeller and the cleaning fan is adjusted again, so that the first impeller and the cleaning fan rotate at high speed for a period of time to throw out the residual grease in the fan system.

[0018] Further preferably, in step S3, the first impeller and the cleaning fan rotate at a high speed of 950-1200 rpm for 2-3 minutes.

[0019] Preferably, in step S2, the speed of the cleaning fan is 600-900 rpm; the time for intermittent hot air exhaust is 2-6 minutes;

[0020] The cleaning fan works intermittently in the following manner: the cleaning fan works continuously for 3-10 seconds and then stops for 8-20 seconds.

[0021] Preferably, in step S1, when the hot air device is working, the rotation speed of the cleaning fan is 600-900 rpm; and the time for continuously exhausting hot air is 3-10 minutes.

[0022] Compared with the prior art, the present invention has at least the following beneficial effects:

[0023] In the oil fume exhaust device of the present invention, the mounting end of the hot air chamber passes through the outer wall of the volute and extends to the interior of the volute, so that the air outlet of the hot air chamber is directed towards the outer peripheral wall of the first impeller, that is, the air outlet of the hot air chamber can directly face the outer peripheral wall of the first impeller, so that the hot air discharged from the hot air chamber can directly contact the first impeller; on the one hand, the high-temperature heating element can generate hot air of not less than 200°C, and the temperature of the hot air just discharged from the air outlet of the hot air chamber is relatively high, which can be as high as 200°C, so that the grease on the surface of the first impeller can be quickly dried, melted, or even liquefied and burned and gasified; on the other hand, the wind speed of the hot air just discharged from the air outlet of the hot air chamber is relatively high, which can directly produce a large impact with the first impeller, thereby knocking the first impeller and accelerating the shedding of grease, thereby having a better cleaning effect on the first impeller; at the same time, under the rotation of the first impeller, the hot air directly contacting the first impeller is easily reflected to the inner surface of the volute, thereby having a better cleaning effect on the volute; thereby achieving the effect of efficiently cleaning the first impeller and the volute at the same time. Moreover, the fume exhaust equipment does not require waterproofing of the fan system, which greatly reduces the implementation cost.

[0024] In addition, in the cleaning method of the present invention, in the initial stage of cleaning, the air outlet of the hot air chamber is first continuously discharged with hot air of not less than 200°C, so that the hot air quickly fills the entire fan system, and the adhered grease is quickly dried, melted, liquefied and even burned and gasified through continuous high temperature and high speed hot air; then the cleaning fan is operated intermittently to discharge hot air intermittently to form a hot air hammer to knock the melted grease in the fan system, so that the grease falls off quickly, thereby improving the cleanliness of the fan system, avoiding grease residue, and further improving its cleaning effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the installation structure of a hot air device in an oil fume exhaust device with a fan system cleaning function in this embodiment.

[0026] Figure 2 This is a structural schematic diagram of a hot air device in an oil fume exhaust device with a fan system cleaning function in this embodiment.

[0027] Explanation of the accompanying drawings: 1 volute; 2 first impeller; 3 hot air device; 31 hot air chamber; 32 air inlet; 33 cleaning fan; 34 high-temperature heating element; 35 mounting end; 36 air outlet. DETAILED DESCRIPTION

[0028] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] Example

[0030] This embodiment of the invention is a fume exhaust device with a fan system cleaning function, see Figure 1 , including a fan system for extracting oil smoke, the fan system is installed in the body of the oil smoke exhaust device; the fan system is preferably a centrifugal fan, the fan system includes a volute 1 and a first impeller 2 installed in the volute 1, and the first impeller 2 can rotate along the rotating shaft under the drive of the centrifugal fan to exhaust the oil smoke to the outside. When the oil smoke exhaust device is working, under the rotation and adsorption action of the first impeller 2, the oil smoke generated in the kitchen is sucked into the body, and then passes through the volute 1 and is exhausted to the outside from the exhaust port of the volute 1 to realize the oil smoke extraction function of the oil smoke exhaust device. In the process of extracting oil smoke, the first impeller 2 will inevitably come into contact with the oil smoke, causing some oil and grease of the oil smoke to adhere to the first impeller 2, so the first impeller 2 needs to be cleaned.

[0031] Among them, see Figure 2A hot air device 3 is installed on the outer wall of the volute 1 to produce and discharge high-temperature hot air with a temperature of not less than 200°C from the outlet of the hot air device 3. Specifically, the hot air device 3 is provided with a hot air chamber 31, with an air inlet 32 ​​and an air outlet 36 respectively formed at both ends of the hot air chamber 31. A cleaning fan 33 is provided in the hot air chamber 31 on the side near the air inlet 32. The cleaning fan 33 is equipped with a second impeller for discharging hot air. The second impeller is a conventional fan impeller structure. A high-temperature heating element 34 is also provided in the hot air chamber 31 on the side near the air outlet 36. During operation, the cleaning fan 33 draws cold air from outside the hot air chamber 31 into the hot air chamber 31 through the air inlet 32. The high-temperature heating element 34 then rapidly heats the cold air in the hot air chamber 31 to form hot air with a temperature of not less than 200°C. The hot air is then discharged from the air outlet 36 of the hot air chamber 31 under the guidance of the cleaning fan 33.

[0032] Further, see Figure 1-2 The air inlet 32 ​​of the hot air chamber 31 faces the outside of the volute 1, so that the cold air outside the volute 1 enters the hot air chamber 31 from the air inlet 32; the end of the hot air chamber 31 close to the volute 1 is the mounting end 35, and the mounting end 35 of the hot air chamber 31 passes through the outer wall of the volute 1 and extends to the inside of the volute 1, so that the air outlet 36 of the hot air chamber 31 faces the outer peripheral wall of the first impeller 2, that is, the air outlet 36 of the hot air chamber 31 is directly opposite to the outer peripheral wall of the first impeller 2, so that the hot air generated in the hot air chamber 31 can be discharged from the air outlet 36 and directly contact the first impeller 2. In this way, on the one hand, the temperature of the hot air just discharged from the air outlet 36 of the hot air chamber 31 is relatively high, which can quickly dry, melt, liquefy and vaporize the grease on the surface of the first impeller 2. On the other hand, the wind speed of the hot air just discharged from the air outlet 36 of the hot air chamber 31 is also relatively high, which can directly produce a large impact with the first impeller 2, thereby knocking the first impeller 2 and accelerating the shedding of the grease on the surface of the first impeller 2. Under the dual effects of the high temperature and high wind speed of the hot air just discharged from the air outlet 36 of the hot air chamber 31, the first impeller 2 can be better cleaned, and the grease on the surface of the first impeller 2 can be quickly shed. At the same time, under the rotation of the first impeller 2, the hot air directly contacting the first impeller 2 is easily reflected to the inner surface of the volute 1, so as to better clean the volute 1, thereby achieving the effect of efficiently cleaning the first impeller 2 and the volute 1 at the same time. The mounting end 35 of the hot air chamber 31 and the volute 1 can be fixedly mounted to ensure the structural strength and stability of the entire range hood exhaust device. Preferably, the mounting end 35 of the hot air chamber 31 and the volute 1 are detachably mounted, such as by snapping together, to facilitate maintenance and replacement of the hot air device 3. A one-way valve is provided at the connection point between the mounting end 35 of the hot air chamber 31 and the volute 1 to prevent the exhausted hot air from flowing back into the hot air chamber 31, thereby improving the utilization rate of the hot air and preventing the hot air exhausted into the volute 1 from flowing back and contaminating the hot air chamber 31.

[0033] In order to achieve better cleaning effect, the cleaning fan 33 can be set to two freely switchable working modes: continuous exhaust hot air and intermittent exhaust hot air, so that the high-temperature hot air can intermittently beat the first impeller 2 and the volute 1, forcing the colloidal grease to melt, liquefy and vaporize quickly, thereby quickly separating from the volute 1 and the first impeller 2, thereby achieving better cleaning effect of the cleaning fan 33 system.

[0034] Furthermore, the wind direction of the air outlet 36 of the hot air chamber 31 is consistent with the tangent direction of the arc blade of the first impeller 2, to ensure that both sides of the arc blade of the first impeller 2 can fully contact the hot air, thereby efficiently cleaning both sides of the arc blade.

[0035] Among them, in order to better clean the sticky colloidal grease attached to the volute 1 and the first impeller 2, the hot air discharged by the hot air device 3 must have a sufficiently high temperature so that the grease can be dried, melted, liquefied and vaporized by the hot air; based on this, the hot air device 3 is a device that can discharge high-temperature hot air, preferably a hot air gun.

[0036] The high-temperature heating element 34 is provided with a heating wire for heating to form hot air of not less than 200°C; the heating wire is preferably an electric heating wire to heat the cold air in the hot air chamber 31; of course, the high-temperature heating element 34 or the hot air chamber 31 may also be provided with a temperature sensor for detecting the temperature of the hot air, so as to regulate the high-temperature heating element 34 to ensure the stability of the temperature of the hot air after heating in the hot air chamber 31. Preferably, the hot air temperature at the air outlet 36 of the hot air chamber 31 is 200-300°C, and more preferably, the hot air temperature at the air outlet 36 of the hot air chamber 31 is 300°C. On the one hand, the ignition point of 95% of oils and fats is below 320°C. Controlling the hot air temperature at 300°C can ensure that the oils and fats are quickly dried, melted, liquefied, and vaporized by the hot air. On the other hand, if the hot air temperature is too high, there is a risk of fire, which can easily pose a safety hazard. In addition, the hot air can easily damage the anti-corrosion coating on the surface of the volute 1 and the first impeller 2, affecting the service life of the exhaust equipment.

[0037] To further enhance the cleaning effect, in addition to high-temperature hot air, the hot air must also have a sufficient wind speed to achieve a better knocking effect on the first impeller 2 and the volute 1, thereby quickly blowing away the dried and peeled grease. Experiments have shown that when the wind speed at the outlet 36 of the hot air chamber 31 is equal to or greater than 6m / s, the peeled grease can be blown away. Based on this, the shape of the hot air chamber 31 is set to be trumpet-shaped, and the equivalent diameter of the air inlet 32 ​​of the hot air chamber 31 is larger than the equivalent diameter of the air outlet 36 of the hot air chamber 31. In this way, the air inlet 32 ​​of the hot air chamber 31 is large, which can ensure the air intake, while the air outlet 36 is small, which is conducive to generating a certain wind pressure and wind speed, and can ensure that the wind speed at the outlet 36 of the hot air chamber 31 is not less than 6m / s, thereby enhancing the cleaning effect.

[0038] This embodiment also provides a method for cleaning a fume exhaust device having a fan system cleaning function, comprising the following cleaning steps:

[0039] Step S1: driving the first impeller 2 to rotate and starting the hot air device 3 to continuously discharge hot air at a temperature of not less than 200° C. from the air outlet 36 of the hot air chamber 31. The hot air is reflected onto the inner surface of the volute 1 under the rotation of the first impeller 2, so that the grease on the surfaces of the first impeller 2 and the volute 1 is dried and melted by the hot air.

[0040] Step S2: After the hot air is continuously discharged for a period of time in step S1, the cleaning fan 33 is driven to work intermittently, so that the air outlet 36 of the hot air chamber 31 intermittently discharges hot air of not less than 200° C. to remove the grease.

[0041] In the cleaning method, in the initial cleaning stage, the air outlet 36 of the hot air chamber 31 is first continuously discharged with a temperature of not less than 200° C., so that the hot air quickly fills the entire fan system, and the volatile substances in the adhered colloid and grease are quickly volatilized by the continuous high temperature and high speed hot air, thereby drying the fan system. At the same time, the continuous high temperature and high speed hot air can ensure that the grease is quickly melted, liquefied, or even burned and gasified by its heat radiation and air heat conduction. In step S1, when the hot air device 3 is working, the rotation speed of the cleaning fan 33 is 600-900 rpm, preferably 700-800 rpm, and the time for continuous hot air discharge is 3-10 minutes, preferably 3-6 minutes, and more preferably 5 minutes, so that the grease on the first impeller 2 and the volute 1 is fully melted. Then, the cleaning fan 33 is intermittently operated to intermittently discharge hot air to form a hot air hammer to knock the melted grease in the fan system, so that the grease falls off and the cleanliness of the fan system is improved. The cleaning fan 33 can be operated intermittently by manually controlling the switch of the cleaning fan 33; of course, the cleaning fan 33 can also be electrically controlled to operate intermittently using existing circuit technology to make it more convenient to use. To ensure that the hot air hammer formed can quickly remove grease, in step S2, the speed of the cleaning fan 33 is 600-900 rpm, preferably 750-800 rpm, and the time for intermittent hot air exhaust is 2-6 minutes, preferably 3-5 minutes, and more preferably 3 minutes; the intermittent operation mode of the cleaning fan 33 is: after the cleaning fan 33 continuously works for 3-10 seconds, it stops working for 8-20 seconds, preferably: after the cleaning fan 33 continuously works for 3-7 seconds, it stops working for 8-15 seconds, and more preferably: after the cleaning fan 33 continuously works for 5 seconds, it stops working for 10 seconds.

[0042] Furthermore, in order to avoid grease residue, after step S2, the rotational speed of the first impeller 2 and the cleaning fan 33 is manually or electrically adjusted to 950-1200 rpm, so that the first impeller 2 and the cleaning fan 33 rotate at a high speed of 950-1200 rpm for 2-3 minutes to throw out the residual grease in the fan system; the rotational speed of the first impeller 2 and the cleaning fan 33 at high speed is preferably 950-1050 rpm to quickly throw away a small amount of grease that has not fallen off, thereby further improving the cleanliness of the fan system.

[0043] Compared with existing cleaning methods, the cleaning method of the range fumes equipment of this embodiment has a higher degree of cleanliness and a faster cleaning speed, so its cleaning effect is better. Moreover, this cleaning method does not require the fan system to be waterproofed, the implementation cost is greatly reduced, and the process is simpler.

[0044] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they become aware of the basic creative concepts. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the embodiments of the present invention.

[0045] The technical solution provided by the present invention is introduced in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there may be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A method for cleaning an exhaust device having a fan system cleaning function, wherein the exhaust device comprises a fan system for extracting and exhausting the exhaust fumes, the fan system comprising a volute and a first impeller mounted in the volute and capable of rotating along its axis to extract and exhaust the exhaust fumes; characterized in that: A hot air device is installed on the outer wall of the volute, and the hot air device is provided with a hot air cavity, the air inlet of the hot air cavity faces the outside of the volute, and the installation end of the hot air cavity passes through the outer wall of the volute and extends to the inside of the volute, so that the air outlet of the hot air cavity faces the outer peripheral wall of the first impeller; a cleaning fan for exhausting hot air is provided on the side of the hot air cavity near the air inlet, and a high-temperature heating element for heating to form hot air of not less than 200°C is also provided on the side of the hot air cavity near the air outlet; the hot air temperature at the air outlet of the hot air cavity is 200-300°C; and the wind speed at the air outlet of the hot air cavity is not less than 6m / s; The cleaning method comprises the following cleaning steps: Step S1: driving the first impeller to rotate and starting the hot air device to continuously discharge hot air at a temperature of not less than 200° C. from the air outlet of the hot air chamber, so that the hot air is reflected onto the inner surface of the volute under the rotation of the first impeller, so that the grease on the surface of the first impeller and the volute is dried and melted by the hot air; Step S2: After the hot air is continuously discharged for a period of time in step S1, the cleaning fan is driven to work intermittently, so that the air outlet of the hot air chamber intermittently discharges hot air of not less than 200° C. to remove the grease.

2. The method for cleaning a fume exhaust device with a fan system cleaning function according to claim 1, characterized in that: The hot air cavity is in a trumpet shape, and the equivalent diameter of the air inlet of the hot air cavity is larger than the equivalent diameter of the air outlet of the hot air cavity.

3. A method for cleaning an exhaust fume device having a fan system cleaning function according to claim 1 or 2, characterized in that: The cleaning fan is provided with a second impeller for exhausting hot air.

4. The method for cleaning a fume exhaust device having a fan system cleaning function according to claim 1, characterized in that: The high-temperature heating element is provided with a heating wire for heating to form hot air at a temperature not less than 200°C.

5. The method for cleaning a fume exhaust device with a fan system cleaning function according to claim 1, characterized in that: A one-way valve is provided at the communication position between the installation end of the hot air chamber and the volute.

6. The method for cleaning a range hood exhaust device having a fan system cleaning function according to claim 1, characterized in that: The wind direction of the air outlet of the hot air chamber is consistent with the tangent direction of the arc blades of the first impeller.

7. The method for cleaning a range hood exhaust device having a fan system cleaning function according to claim 1, characterized in that: The hot air device is a hot air gun.

8. The method for cleaning a range hood exhaust device having a fan system cleaning function according to claim 1, characterized in that: After the hot air is discharged intermittently for a period of time in step S2, the following cleaning step is also included: step S3, the rotation speed of the first impeller and the cleaning fan is adjusted again, so that the first impeller and the cleaning fan rotate at high speed for a period of time to throw out the residual grease in the fan system.

9. The method for cleaning a fume exhaust device with a fan system cleaning function according to claim 8, characterized in that: In step S3, the first impeller and the cleaning fan rotate at a high speed of 950-1200 rpm for 2-3 minutes.

10. The method for cleaning a range hood exhaust device having a fan system cleaning function according to claim 1, characterized in that: In step S2, the speed of the cleaning fan is 600-900 rpm; the time for intermittent hot air exhaust is 2-6 minutes; The cleaning fan works intermittently in the following manner: the cleaning fan works continuously for 3-10 seconds and then stops for 8-20 seconds.

11. The method for cleaning a range hood exhaust device having a fan system cleaning function according to claim 1, characterized in that: In step S1, when the hot air device is working, the rotation speed of the cleaning fan is 600-900 rpm; the time for continuously exhausting hot air is 3-10 minutes.

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