Purification air duct of range hood and household range hood provided with purification air duct

Abstract

The invention relates to the field of household appliances, in particular to the technical field of range hoods, and more particularly relates to a range hood purification air duct and a household range hood provided with the same, which can effectively remove oil drops and small molecule oil smoke particles in smoke, sterilize, decontaminate and release negative ions, and can effectively purify the smoke. And the device can also be applied to the fields of chemical factories, printing and dyeing industries, building materials, microscopy and the like, has the effects of filtering dust particles and removing harmful gas, and is a purification tool for efficiently removing oil, dust and dirt. Meanwhile, the electric field is used for removing oil stains, so that the device has the advantages of no need of disassembly for cleaning, low noise and the like.

Description

Technical Field

[0001] The present invention relates to the field of household appliances, particularly to the technical field of range hoods, and more specifically to a purification air duct of a range hood and a household range hood equipped with the air duct. Background Art

[0002] Range hoods have evolved from the initial top-mounted thin range hoods to side-mounted deep range hoods, and then to the current situation mainly consisting of top-mounted self-cleaning and European-style range hoods. With the continuous improvement of people's requirements for health and national standards for exhaust gas, improving the purification ability of range hoods has become a research focus for technicians in this field.

[0003] The purification air duct of a range hood is an important part of the range hood and an important device for handling oil fumes and hot air. Therefore, the improvement and optimization of the purification air duct of a range hood have become the key points of research for technicians in this field. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to further improve the purification ability of the range hood.

[0005] To solve the above technical problem, the present invention discloses a purification air duct of a range hood, which includes an air box enclosing plate, an air box cover plate, and an air box top plate. The air box enclosing plate and the air box cover plate form an air duct, the air box top plate is located at the end of the air duct, an air outlet is opened on the air box top plate, a filter net is arranged at the beginning of the air duct, and a fan is arranged at the end of the air duct; it further includes a purification electric field system, and the purification electric field system includes an electric field power supply, an electric appliance box, an electric field component, and a computer board bottom plate. The electric field component is arranged in the air duct, the electric appliance box, the electric field power supply, and the computer board component are all arranged outside the air box top plate, the electric appliance box, the electric field power supply, and the computer board component are all connected to the electric field component. The electric field component includes relatively arranged high-voltage anode plates, and the voltage between the anode plates is greater than or equal to the dielectric strength of the air between the anode plates.

[0006] The oil fume gas enters from the beginning of the air duct under the action of the fan and leaves from the end of the air duct, that is, the air outlet on the air box top plate. In this process, it passes through the filter net and the electric field component in sequence, thereby effectively removing the oil droplets and small molecule oil fume particles in the oil fume gas and achieving the oil removal effect.

[0007] Under the action of the DC power supply of the electric field power supply, two high-voltage anode plates in the electric field component form an electrostatic field, and the voltage value is greater than or equal to the dielectric strength of the air between the anode plates, that is, the voltage exceeds the insulation strength of the air between the two poles. At this time, a corona current will be generated. The small molecule oil fume particles are polarized under the action of the corona current, split into ion groups with positive and negative charges, and are further neutralized at the two plates, and then split again, finally achieving the decomposition purpose.

[0008] The dielectric constants of different substances are different. The larger the dielectric constant, the stronger the response ability of the substance to the electric field, the larger the capacitance of the capacitor, and correspondingly, the smaller the electric field strength. The electric field strength represents the density of charge distribution in the electric field and is related to the force between charges and the potential difference.

[0009] In the present invention, the voltage between the high-voltage anode plates in the electric field is preferably 10.25 - 14 kV.

[0010] In one embodiment, the inner side of the high-voltage anode plate is provided with sharp protrusions. By setting the sharp protrusions, charge accumulation can be formed to provide the charge density at the protrusions, thereby further improving the ionization and decomposition of oil fume particles.

[0011] In one embodiment, the filter net is of a multi-layer structure, and each layer is a mesh filtering unit, and the mesh holes in each layer of mesh filtering units are staggered.

[0012] In practical applications, a material resistant to oil stains can be selected to prepare the mesh filtering unit, such as 304 stainless steel or 316 stainless steel, etc. In the present invention, the dense filtering channels are formed by the superposition of the staggered mesh holes in each layer of mesh filtering units, which can cool down the water vapor and intercept larger oil particles to prevent them from entering the air duct.

[0013] In one embodiment, a sterilization component is further included. The sterilization component includes an ultraviolet lamp and a titanium dioxide carrier, and a nano-level titanium dioxide coating layer is attached to the surface of the titanium dioxide carrier.

[0014] In one embodiment, the titanium dioxide carrier is of a honeycomb structure.

[0015] In one embodiment, an ultraviolet lamp frame is further included. The ultraviolet lamp is horizontally fixed in the ultraviolet lamp frame, and the titanium dioxide carrier is placed flat on the upper part of the ultraviolet lamp frame.

[0016] Under the irradiation of light, titanium dioxide uses the moisture and oxygen molecules in the air to generate extremely strong oxidizing hydroxyl radicals and reactive oxygen species, which can kill bacteria and decompose organic pollutants to generate carbon dioxide and water. The light here refers to ultraviolet light with a wavelength of less than 185 μm.

[0017] In one embodiment, the present invention uses a titanium dioxide coating of 3 - 5 nm.

[0018] The present invention uses a honeycomb structure as the carrier of the titanium dioxide coating, which can increase the specific surface area, thereby increasing the contact surface of titanium dioxide and improving the purification efficiency.

[0019] In specific applications, we can comprehensively consider and select appropriate materials to make titanium dioxide carriers. For example, in some implementation schemes, we choose an aluminum substrate to form an aluminum honeycomb titanium dioxide carrier.

[0020] In a specific embodiment, the fan is a backward inclined centrifugal fan.

[0021] The present invention also discloses a household range hood equipped with the aforementioned range hood purification duct. Generally speaking, a household range hood comprises a housing, an air duct oil collection and exhaust device, a lighting device, a power switch, and a power cord. By utilizing the aforementioned air duct, the present invention can effectively purify oil fumes.

[0022] The range hood air inlet duct disclosed in this invention not only effectively removes oil droplets and small oil fume particles from smoke, sterilizes and removes contaminants, and releases negative ions, but can also be used in chemical plants, the printing and dyeing industry, building materials, microscopy, and other fields to filter dust particles and remove harmful gases, making it a highly efficient purification tool for oil, dust, and contaminant removal. Furthermore, because it uses an electric field to remove oil contaminants, it has the advantages of eliminating the need for disassembly and cleaning, and is low-noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is the exploded view of the range hood purification duct.

[0024] Figure 2 Schematic diagram of the high voltage anode plate.

[0025] Figure 3 Schematic diagram of the filter.

[0026] Figure 4 Schematic diagram of titanium dioxide support.

[0027] Figure 5 This is a schematic diagram of a range hood.

[0028] Figure 6 This is a schematic diagram of the explosion of the range hood except the air duct. DETAILED DESCRIPTION

[0029] The embodiments of the present invention are described in further detail below with reference to the accompanying drawings and examples. Example 1

[0030] like Figure 1 The range hood purification air duct shown in the figure includes a bellows enclosure 3, a bellows cover 11, and a bellows top plate 6. The bellows enclosure 3 and the bellows cover 11 form an air duct, and the bellows top plate 6 is located at the end of the air duct (at Figure 1The air duct is from bottom to top. There is an air outlet 8 on the top plate 6 of the air box. A filter net 1 is arranged at the beginning of the air duct, and a fan 5 is arranged at the end of the air duct. It also includes a purification electric field system. The purification electric field system includes an electric field power supply 18, an electric appliance box 19, an electric field component 12 and a computer board component. The computer board component includes a bottom plate 9 and a computer board 10. The electric field component is arranged in the air duct. The electric appliance box 19, the electric field power supply 18, the bottom plate 9 of the computer board component and the computer board 10 are all arranged outside the top plate of the air box. The electric appliance box, the electric field power supply and the computer board component are all connected to the electric field component. The electric field component 12 includes relatively arranged high-voltage anode plates, and the voltage between the anode plates is greater than or equal to the dielectric strength of the air between the anode plates. In this embodiment, we select 10.25 - 14 kV.

[0031] Under this condition, the corresponding current and power are shown in Table 1. Table 1

[0032] The electric appliance box plays a safety role, and the computer board is used to start the motor and adjust the gear wind speed. As a supporting device for motor starting, we also indicate the position of the capacitor 7 in Fig. 1.

[0033] Furthermore, combined with Figure 2 it can be seen that in this embodiment, the inner side of the high-voltage anode plate has sharp protrusions, which are represented by concentric circles and single-point circles in the figure. The concentric circles refer to a conical protrusion, and the single-point circles represent needle-shaped protrusions. At these sharp protrusions, a conductor tip with extremely strong electric field is formed. Under the action of this strong electric field, the residual grease ions move at an accelerated speed. The accelerated ions collide with other air molecules, causing them to ionize, thus resulting in the generation of a large number of new ions, making the air more conductive. At the same time, the ions with opposite charge to the charge on the tip are continuously attracted to the tip, neutralize the charge on the tip, and then continue to be polarized and split.

[0034] The action mode of the electric field component is that two high-voltage anode plates in the electric field component form an electrostatic field under the action of the DC power supply of the electric field power supply. The voltage value is greater than or equal to the dielectric strength of the air between the anode plates, that is, the voltage exceeds the insulation strength of the air between the two poles. At this time, a corona current will be generated. Small molecule oil fume particles are polarized under the action of the corona current, split into ion groups with positive and negative charges, and are further neutralized at the two plates, and then split again, finally achieving the decomposition purpose.

[0035] After turning on the electric field power supply, the voltage across the electrodes rises with the power supply voltage, and the current at this time is basically zero. As the voltage rises, when the voltage exceeds the dielectric strength (insulation strength) of the air between the two poles, the curve becomes relatively flat, and at this time the current (halo current) begins to rise. After continuing to increase the voltage, when the current reaches a certain level, a sudden change will occur and the voltage will drop sharply. The state at this time is discharge, and a strong discharge phenomenon will occur in the electric field. In the electric field where the halo current is formed, the electron flow emitted from the negative electrode hits and adheres to the oil particles, forming a situation of "pulling" and "sticking", so that the oil particles are fully polarized and charged.

[0036] In this embodiment, further, we can see that Figure 3 the filter screen 1 described in is a multi-layer structure, and each layer is a mesh filter unit. The mesh holes in each layer of mesh filter units are staggered, thus forming a dense mesh hole channel. This can not only ensure the filtering effect but also not affect the air duct ventilation performance.

[0037] In this example, we use 304 stainless steel to make this filter screen.

[0038] Return to Figure 1 , in this embodiment, it further includes a sterilization component. The sterilization component includes an ultraviolet lamp 15 and a titanium dioxide carrier 16, and a nano-scale titanium dioxide coating layer is attached to the surface of the titanium dioxide carrier 16. As Figure 4 shown, the titanium dioxide carrier is a honeycomb structure.

[0039] Combined with Figure 1 it can be seen that it further includes an ultraviolet lamp frame 14. The ultraviolet lamp 15 is connected to the power supply through an ultraviolet lamp plug 2 and is horizontally fixed in the ultraviolet lamp frame 14. The titanium dioxide carrier 16 is placed flat on the upper part of the ultraviolet lamp frame. It can be seen that a connector 13 of the electric field component is provided at the bottom of the ultraviolet lamp frame 14 to connect the insulating terminals and connection points of the electric field component 12 and the ultraviolet lamp frame 14.

[0040] In this embodiment, as can be seen from FIG. 1, a wind guide ring 2 is provided below the fan 5.

[0041] In use, this air duct 25 needs to be assembled with other components to form a range hood. As can be seen from FIGS. 5 and 6, it further includes a housing 20, a switch panel 21, an anti-fouling plate 22, an oil collecting tank 23, and a fixing member 24 for the oil collecting tank 23. The air duct is installed at the top of the housing 20.

[0042] Combined with the above structure, we further elaborate on the working process of the present invention: Turn on the range hood switch 26. The oil smoke enters from the beginning of the air duct under the action of the fan and first passes through the filter. The mesh holes in each layer of mesh filter unit are stacked together to form a dense filter channel, which cools the water vapor and intercepts larger oil particles to prevent them from entering the air duct. The oil smoke after preliminary filtration further enters the electric field component. In the electric field component, it is subjected to the high-voltage electric field, which polarizes the oil droplets, thereby tearing the oil droplets apart and dividing them into particle clusters with positive and negative charges. Furthermore, the electron flow emitted by the negative electrode of the electric field hits and adheres to the oil particles, forming a "pulling" and "sticking" condition, which makes the oil particles fully polarized and charged. At the same time, ions with opposite electrical properties to the charge on the tip are continuously attracted to the tip and neutralize the charge on the tip, forming the so-called tip discharge.

[0043] The flue gas after electric field treatment further enters the sterilization component. Under the irradiation of ultraviolet light with a wavelength below 185um, titanium dioxide utilizes moisture and oxygen molecules in the air to produce hydroxyl free radicals and active oxygen with extremely strong oxidizing ability, killing bacteria in the flue gas and decomposing organic pollutants into carbon dioxide and water.

[0044] Finally, the clean air after a series of treatments leaves from the end of the air duct, that is, the air outlet on the top plate of the bellows.

[0045] As can be seen, during this process, the range hood duct not only effectively removes oil droplets and small oil fume particles from the smoke, sterilizes and removes dirt, and releases negative ions, but can also be used in chemical plants, printing and dyeing industries, building materials, microscopy, and other fields to filter dust particles and remove harmful gases, making it a highly effective purification tool for oil removal, dust removal, and dirt removal. Furthermore, because it uses an electric field to remove oil stains, it has the advantages of no need for disassembly and cleaning and low noise.

Claims

1. The purification air duct of the range hood is characterized in that: It includes a bellows shroud, a bellows cover plate, and a bellows top plate. The bellows shroud and the bellows cover plate form an air duct. The bellows top plate is located at the end of the air duct. An air outlet is provided on the bellows top plate. A filter screen is provided at the beginning of the air duct, and a fan is provided at the end of the air duct. It further includes a purification electric field system. The purification electric field system includes an electric field power supply, an electrical box, an electric field component, and a computer board component. The electric field component is arranged in the air duct. The electrical box, the electric field power supply, and the computer board component are all arranged outside the bellows top plate. The electrical box, the electric field power supply, and the computer board component are all connected to the electric field component. The electric field component includes relatively arranged high-voltage anode plates, and the voltage between the anode plates is greater than or equal to the dielectric strength of the air between the anode plates.

2. The purification air duct of the range hood according to claim 1, characterized in that: The inner side of the high-voltage anode plate is provided with sharp protrusions.

3. The purification air duct of the range hood according to claim 1, characterized in that: The filter screen is of a multi-layer structure, and each layer is a mesh filtering unit, and the mesh holes in each layer of mesh filtering units are staggered.

4. The purification air duct of the range hood according to claim 1, characterized in that: It further includes a sterilization component. The sterilization component includes an ultraviolet lamp and a titanium dioxide carrier, and a nano-level titanium dioxide coating layer is attached to the surface of the titanium dioxide carrier.

5. The purification air duct of the range hood according to claim 4, wherein: The titanium dioxide carrier is of a honeycomb structure.

6. The purification air duct of the range hood according to claim 4, wherein: It further includes an ultraviolet lamp frame. The ultraviolet lamp is horizontally fixed in the ultraviolet lamp frame, and the titanium dioxide carrier is placed flat on the upper part of the ultraviolet lamp frame.

7. The purification air duct of the range hood according to claim 1, characterized in that: The fan is a backward-inclined centrifugal fan.

8. The purification air duct of the range hood according to claim 1, characterized in that: The voltage between the anode plates is 10.25 - 14 kV.

9. A household range hood equipped with the purification air duct of the range hood according to any one of claims 1 to 8.

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