Negative ion generating device and range hood with same

Abstract

The negative ion generating device comprises a mounting plate, a containing groove is formed in the mounting plate, an opening of the containing groove faces the first side of the mounting plate, the mounting plate is further provided with an air inlet channel, and the air inlet channel is communicated with the containing groove; airflow flowing from the second side of the mounting plate to the first side of the mounting plate enters the accommodating groove through the air inlet channel and is discharged in the direction far away from the second side of the mounting plate; the negative ion generator is arranged in the containing groove and used for generating negative ions, and the negative ions are discharged in the direction away from the second side of the mounting plate along with airflow entering the containing groove; compared with the prior art, when the negative ion generating device works, airflow on the second side of the mounting plate flows towards the first side of the mounting plate 1 and then enters the containing groove through the air inlet channel in the mounting plate, negative ions generated by the negative ion generator are blown downwards, and the diffusion distance of the negative ions is increased.

Description

Technical Field

[0001] The utility model relates to the technical field of range hoods, and in particular to a negative ion generating device and a range hood having the same. Background Art

[0002] When users are cooking, a lot of oil smoke will be generated. When the range hood is started, the exhaust fan of the range hood forms a negative pressure at the air intake. The oil smoke generated by cooking flows toward the air intake of the range hood under the action of the negative pressure, and enters the air collecting box of the range hood through the air intake of the range hood, and is then discharged outdoors. In the process of the oil smoke flowing toward the air intake, part of the air flow surface formed by the oil smoke will escape outward and be inhaled by the user. Long-term inhalation of oil smoke will affect the health of the user. For this reason, there are A range hood with an air curtain. When the range hood is in operation, the main body of the range hood discharges air curtain wind downward between the user and the stove. The air curtain formed by the air curtain wind can, to a certain extent, block the escape of oil smoke. However, when the escaping oil smoke passes through the air curtain and is blocked by the air curtain, it will mix with the air curtain and flow downward with the air curtain, causing the air curtain wind to be contaminated by the oil smoke. If the user walks or stirs the food while cooking and disturbs the air curtain, the air curtain wind contaminated by the oil smoke will also escape to the user's mouth and nose and be inhaled by the user. Utility Model Content

[0003] The purpose of the present invention is to provide a negative ion generating device and a range hood having the same, which are used to solve the above-mentioned technical problems.

[0004] A negative ion generating device for a range hood, comprising:

[0005] The mounting plate is provided with a receiving groove, the opening of the receiving groove faces the first side of the mounting plate, and the mounting plate is further provided with an air inlet passage, so that airflow flowing from the second side of the mounting plate to the first side of the mounting plate enters the receiving groove through the air inlet passage and is discharged in a direction away from the second side of the mounting plate;

[0006] The negative ion generator is arranged in the receiving tank and is used for generating negative ions. The negative ions are discharged in a direction away from the second side of the mounting plate along with the air flow entering the receiving tank.

[0007] According to one embodiment of the present invention, the emission end of the negative ion generator extends out of the first side of the mounting plate by a distance x, and the head diameter of the emission end of the negative ion generator is D1, where x≥D1.

[0008] According to one embodiment of the present invention, the diameter of the head of the emitting end of the negative ion generator is D1, the diameter of the lower edge of the accommodating groove is D2, D2 ≥ 5mm > D1, 2mm < D1 < 5mm.

[0009] According to one embodiment of the present invention, a vent hole is provided on the top of the accommodating tank, and the vent hole is connected to the channel of the accommodating tank to form an air intake channel.

[0010] According to one embodiment of the present invention, the head diameter of the emitting end of the negative ion generator is D1, the lower edge diameter of the accommodating groove is D2, D2≥5mm, 2mm<D1<5mm, and the diameter of the vent hole is D3, 1mm≤D3≤(D2-D1) / 2.

[0011] According to one embodiment of the present invention, a mounting channel and an air vent arranged around the mounting channel are provided at the top of the accommodating tank. The emission end of the negative ion generator extends into the accommodating tank through the mounting channel. The gap between the part of the negative ion generator placed in the mounting channel and the inner wall surface of the mounting channel and the channel through which the air vent connects to the accommodating tank constitute an air intake channel.

[0012] According to one embodiment of the present invention, an air supply device is further included, which transports air from the second side of the mounting plate to the first side of the mounting plate.

[0013] According to one embodiment of the present invention, the air supply device includes a fan, which is a cross-flow fan. A plurality of air curtain exhaust holes are provided on the mounting plate. The cross-flow fan is mounted on the mounting plate with its air outlet side facing the air curtain exhaust holes.

[0014] According to one embodiment of the present invention, the air supply device includes a fan and an air duct, the fan is an axial flow fan, and one side of the air duct has an air inlet. The axial flow fan is installed at the air inlet. The cross-section of the air duct gradually decreases from one end close to the axial flow fan to the end away from the axial flow fan. The bottom of the air duct is connected to the second side of the mounting plate, and a plurality of uniform air holes are provided on the mounting plate. The incoming air in the air duct is discharged to the first side of the mounting plate through the uniform air holes and the air inlet channel.

[0015] A range hood adopts the above-mentioned negative ion generating device, including a range hood body, the range hood body having a cover plate, a top plate and an installation cavity located between the cover plate and the top plate, the negative ion generating device is arranged in the installation cavity, the top plate is provided with a avoidance opening corresponding to the installation plate, and an air supply device is also provided in the installation cavity, the air supply device is installed on the second side of the installation plate, the cover plate is provided with an air curtain suction port corresponding to the air supply device, the air supply device draws air from the air curtain suction port and transports the air downward through the installation plate.

[0016] Compared with the prior art, the negative ion generating device of the present invention has the following advantages:

[0017] When the negative ion generating device of the present invention is working, the airflow on the second side of the mounting plate flows toward the first side of the mounting plate 1, and then enters the receiving tank through the air inlet channel on the mounting plate, blowing the negative ions generated by the negative ion generator downward, thereby increasing the diffusion distance of the negative ions. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The explosion of the first embodiment of the negative ion generating device;

[0019] Figure 2 A bottom view of a first embodiment of a negative ion generating device;

[0020] Figure 3 An exploded view of a second embodiment of a negative ion generating device;

[0021] Figure 4 A bottom view of a second embodiment of a negative ion generating device;

[0022] Figure 5 This is an exploded view of a negative ion generator;

[0023] Figure 6 An exploded view of a range hood having a negative ion generating device according to the first embodiment;

[0024] Figure 7 A cross-sectional view of a range hood having a negative ion generating device according to the first embodiment;

[0025] Figure 8 for Figure 7 A magnified view of middle A;

[0026] Figure 9 An exploded view of a range hood having a negative ion generating device according to the second embodiment;

[0027] In the figure: 1. Mounting plate, 11. Receiving groove, 12. Ventilation hole, 13. Mounting channel, 14. Air curtain exhaust hole, 15. Air uniformity hole, 2. Negative ion generator, 3. Air supply device, 31. Fan, 32. Air duct, 321. Air inlet, 4. Range hood body, 41. Cover plate, 411. Air curtain suction port, 42. Top plate.

[0028] The realization of the functions and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0029] The following diagrams illustrate various embodiments of the present invention. For clarity, many practical details will be included in the following description. However, it should be understood that these practical details are not intended to limit the present invention. In other words, in some embodiments of the present invention, these practical details are not essential. Furthermore, to simplify the drawings, some commonly used structures and components are depicted in simplified schematic form.

[0030] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0031] In addition, in the present invention, descriptions such as "first" and "second" are only used for descriptive purposes and do not specifically refer to the order or sequence, nor are they used to limit the present invention. They are only used to distinguish components or operations described with the same technical terms, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0032] In order to further understand the content, features and effects of the present invention, the following embodiments are given as examples and described in detail with reference to the accompanying drawings:

[0033] See also Figures 1 to 4 The present utility model discloses a negative ion generating device. The negative ion generating device disclosed in the present utility model is used for a range hood and includes a mounting plate 1 and a negative ion generator 2. A receiving groove 11 is provided on the mounting plate 1. The opening of the receiving groove 11 faces the first side of the mounting plate 1. The mounting plate 1 is also provided with an air intake channel. The airflow flowing from the second side of the mounting plate 1 to the first side of the mounting plate 1 enters the receiving groove 11 through the air intake channel and is discharged in a direction away from the second side of the mounting plate 1. The negative ion generator 2 is arranged in the receiving groove 11 and is used to generate negative ions. The negative ions are discharged in a direction away from the second side of the mounting plate 1 along with the airflow entering the receiving groove 11. When the negative ion generating device of the present utility model is in operation, the airflow from the second side of the mounting plate 1 flows toward the first side of the mounting plate 1, and then returns through the air intake channel on the mounting plate 1 to enter the receiving groove 11, blowing the negative ions generated by the negative ion generator 2 downward, thereby increasing the diffusion distance of the negative ions.

[0034] When the negative ion generating device of the present invention is applied to the range hood, the first side of the mounting plate 1 is the lower side of the mounting plate 1, and the second side of the mounting plate 1 is the second side of the mounting plate 1. A fan is provided on the second side of the mounting plate 1. When the range hood is working, the fan starts and discharges the air on the second side of the mounting plate 1 to the first side of the mounting plate 1. The negative ion generator 2 works, and the emission end of the negative ion generator 2 discharges and ionizes the surrounding air to generate negative ions. The generated negative ions come into contact with pollutants in the air during the diffusion process, purify the pollutants in the air, and can play a role in purifying the air. If there is no air flowing from the second side of the mounting plate 1 to the first side of the mounting plate 1, the diffusion distance of the negative ions emitted by the emitting end of the negative ion generator 2 is limited, and they may not have diffused to the inhalation range corresponding to the user's mouth and nose, but have already reacted with the surrounding air and been consumed, and the effect of purifying the air in the inhalation range corresponding to the user's mouth and nose can not be achieved; therefore, the negative ion generating device of the present invention is provided with an air intake channel on the mounting plate 1, and an airflow flows from the second side of the mounting plate 1 to the first side of the mounting plate 1. When the negative ion generator 2 is turned on, a large number of negative ions gathered near the emitting end of the negative ion generator 2 will flow downward under the action of the airflow, and the downward diffusion distance is greater than the distance that can be diffused when it is emitted by itself, and the purification range is expanded; when the negative ions flow through the corresponding position of the user's mouth and nose, the air in the corresponding range can be purified to prevent the user from inhaling oil smoke.

[0035] See also Figure 5 The negative ion generating device of the present invention includes a negative ion generator 2 comprising a carbon fiber head 21 and a metal cladding 22. The metal cladding 22 wraps around one end of the carbon fiber head 21. The metal cladding 22 is connected to a high-voltage transformer via a wire 23, and the high-voltage transformer is connected to the circuit board of the range hood. When the negative ion generator 2 is required to generate negative ions, the circuit board connects the high-voltage transformer to the circuit. The current of the high-voltage transformer is transmitted to the metal cladding 22 via the wire 23. The current transmitted to the metal cladding 22 is transmitted along the metal cladding 22 and to the surface of the carbon fiber head 21. Then, the current is transmitted along the surface of the carbon fiber head 21 to the tip of the carbon fiber head 21. The tip of the carbon fiber head 21 discharges, ionizes the air, and generates negative ions. The tip of the carbon fiber head 21 is at a distance from the metal cladding 22, so that the negative ions generated by the discharge at the tip of the carbon fiber head 21 are not easily extinguished by the metal cladding 22.

[0036] In the negative ion generating device of the present invention, at least the tip of the carbon fiber head 21 is coated with PDG organic gel. The hydrophilic polymer chains and solvent molecules on the gel surface effectively capture gaseous water molecules in the air, liquefying the water molecules and rapidly conducting them into the interior of the polymer gel network through the solvent molecules. Because the polymer gel can swell significantly under the action of water, its volume can swell several times while still maintaining good strength. Water molecules adsorbed within it are effectively bound by the polymer chains without significant leakage or outflow. Therefore, the diluted polymer organic gel can effectively capture water molecules from the air and well accommodate and store them. The hygroscopic polymer gel on the surface of the carbon fiber head 21 transfers the adsorbed water molecules to the surface of the carbon fiber head 21 through the hydrophilic effect of the carbon fiber head 21. Then, using the water absorption and capillary action of the carbon fiber head 21, the water molecules are transferred to the tip of the carbon fiber head 21, where they are enriched and concentrated at the tip of the carbon fiber head 21, thereby generating negative oxygen ions under voltage.

[0037] In the negative ion generating device of the present invention, the resistance at the metal cladding 22 is R1, the resistance from the metal cladding 22 connecting one end of the wire 23 to the tip of the carbon fiber head 21 is R2, the resistance at the wire 23 is R3, and the resistance from the metal cladding 22 connecting one end of the wire 23 to the middle of the carbon fiber head 21 is R4. Then, the following equations apply: R3 < R1 < R2 < R4, 2Ω < R1 < 3.5Ω, 8Ω < R2 < 13Ω, 1Ω < R3 < 2Ω, and 15Ω < R4 < 18Ω. The resistance at the carbon fiber head 21 is the smallest, and the voltage flowing there is the largest. When the tip of the carbon fiber head 21 discharges, the more negative ions are generated by ionizing the air.

[0038] The negative ion generating device of the present invention, after the negative ion generator 2 is powered on, the portion of the carbon fiber head 21 of the negative ion generator 2 extending out of the metal cladding 22 comes into contact with the air, which can ionize the air and generate negative ions. A receiving groove 11 with an opening facing downward is provided on the mounting plate 1. The portion of the carbon fiber head 21 of the negative ion generator 2 placed in the receiving groove 11 will also come into contact with the air in the receiving groove 11, ionize the air and generate negative ions, which can increase the amount of negative ions generated.

[0039] In the negative ion generating device of the present invention, the emitting end of the negative ion generator 2 extends from the first side of the mounting plate 1 by a distance x, and the head diameter of the emitting end of the negative ion generator 2 is D1, where x ≥ D1. The longer the emitting end of the negative ion generator 2 extends from the lower surface of the mounting plate 1, the shorter its distance from the user's mouth and nose corresponding to the inhalation range, and the larger its effective contact area with the air, the more negative ions produced, and the better the air purification effect. However, in reality, if the negative ion generator 2 extends downward from the lower surface of the mounting plate 1 by more than a certain distance, it will affect user operation and the overall appearance of the range hood. Therefore, in this embodiment, the emitting end of the negative ion generator 2 extends downward from the lower surface of the mounting plate 1 by a distance greater than or equal to the head diameter of the emitting end of the negative ion generator 2. This ensures that the distance between the emitting end of the negative ion generator 2 and the mounting plate 1 is sufficient to reduce the consumption of negative ions by the mounting plate 1. It also allows the emitting end of the negative ion generator 2 to fully contact the air, thereby producing a large amount of negative ions.

[0040] In the negative ion generating device of the present invention, the diameter of the head of the emitting end of the negative ion generator 2 is D1, and the diameter of the lower edge of the receiving tank 11 is D2, where D2 ≥ 5mm > D1, and 2mm < D1 < 5mm. The lower edge diameter of the receiving tank 11 is larger than the diameter of the head of the emitting end of the negative ion generator 2, so that the emitting end of the negative ion generator 2 does not contact the wall surface of the receiving tank 11. The larger the space surrounding the negative ion generator 2 in the receiving tank 11, the more negative ions are generated, and the less negative ions are dissipated when flowing out of the receiving tank 11, thereby improving the purification effect of the negative ions generated by the negative ion generator 2.

[0041] See also Figures 1 to 4 In the negative ion generating device of the present invention, a vent hole 12 is provided at the top of the receiving tank 11. The vent hole 12 connects to the channel of the receiving tank 11 to form an air inlet channel. When the airflow from the second side of the mounting plate 1 flows toward the first side of the mounting plate 1, the airflow enters the receiving tank 11 through the vent hole 12, blowing the negative ions generated by the negative ion generator 2 toward the mounting plate 1 for the first time, causing the negative ions to diffuse further.

[0042] In the negative ion generating device of the present invention, the diameter of the head of the emitting end of the negative ion generator 2 is D1, the diameter of the lower edge of the receiving tank 11 is D2, where D2 ≥ 5mm and 2mm < D1 < 5mm, and the diameter of the vent 12 is D3, where 1mm ≤ D3 ≤ (D2 - D1) / 2. When the negative ion generating device is applied to a range hood, during operation, the fan on the second side of the mounting plate 1 is activated, discharging air from the second side of the mounting plate 1 toward the first side of the mounting plate 1. The air discharged toward the first side can enter the receiving tank 11 through the vent 12, blowing the negative ions in the receiving tank 11 and the negative ions from the emitting end of the negative ion generator 2 downward, thereby increasing the diffusion distance of the negative ions. Furthermore, the negative ion generator 2 generates negative ions by discharging at the tip of its carbon fiber head 21, ionizing air. This causes air from the second side of the mounting plate 1 to enter the receiving tank 11 through the vent 12. This allows the portion of the carbon fiber head 21 located within the receiving tank 11 to ionize the air and generate negative ions, thereby increasing the amount of negative ions produced. After the negative ions are generated, new air enters the receiving tank and, while being ionized by the carbon fiber head 21, propels the generated negative ions downward, allowing them to move into the inhalation area corresponding to the user's mouth and nose, purifying the air within this area and providing a healthy cooking environment. When the negative ion generator 2 is installed in the receiving tank 11, the top of the receiving tank 11 defines a mounting channel. The carbon fiber head 21 of the negative ion generator 2 is positioned within the receiving tank 11 through the mounting channel, with the emitting end extending from the receiving tank 11. The width of the circular ring surrounding the mounting channel is D2-D1, and the diameter D3 of the vent 12 must satisfy D3 ≤ (D2-D1) / 2. When D3 = (D2-D1) / 2, the vent 12 can form a mounting channel, and the carbon fiber head 21 directly passes through the vent 12 into the receiving tank 11, and the emission end extends out of the receiving tank 11. When D3 of the vent 12 is directly less than (D2-D1) / 2, the vent 12 is a hole that is arranged on a ring surrounding the mounting channel and is connected to the receiving tank 11. The larger the aperture of the vent 12, the smaller the wind resistance when the air on the second side of the mounting plate 1 enters the receiving tank 11 through the vent 12, the smaller the speed of the air flow entering the receiving tank 11, and the smaller the distance that the air flow out of the receiving tank 11 blows the negative ions. The smaller the aperture of the vent 12, the smaller the air on the second side of the mounting plate 1 enters the receiving tank 11 through the vent 12. 1, the greater the wind resistance, the greater the speed of the airflow entering the receiving tank 11, and the greater the distance the airflow out of the receiving tank 11 blows the negative ions. However, if the aperture of the vent 12 is too small, it will affect the amount of air entering the receiving tank 11 and generate noise. Therefore, in this embodiment, the aperture D3 of the vent 12 satisfies 1mm≤D3, which can not only ensure the amount of air entering the receiving tank 11, but also ensure that the air entering the receiving tank 11 has a sufficient wind speed to blow the negative ions to the corresponding inhalation range of the user's mouth and nose.

[0043] See also Figures 1 to 4 In the negative ion generating device of the present invention, the top of the receiving tank 11 is provided with a mounting channel 13 and vents 12 disposed around the mounting channel 13. The emission end of the negative ion generator 2 extends through the mounting channel 13 into the receiving tank 11. The gap between the portion of the negative ion generator 2 positioned within the mounting channel 13 and the inner wall of the mounting channel 13, and the passage connecting the vents 12 to the receiving tank 11, constitute an air intake passage. After the negative ion generator 2 is installed in the mounting channel 13, a gap exists between the carbon fiber head 21 of the negative ion generator 2 and the mounting channel 13. Air from the second side of the mounting plate 1 can also enter the receiving tank 11 through the gap between the carbon fiber head 21 and the mounting channel 13. The gap between the carbon fiber head 21 and the mounting channel 13, and the passage connecting the vents 12 to the receiving tank 11, constitute an air intake passage.

[0044] See also Figures 1 to 4 The negative ion generating device of the present invention further includes an air supply device 3, which transports air from the second side of the mounting plate 1 to the first side of the mounting plate 1. When the negative ion generating device is in operation, the air supply device 3 is activated, and the air supply device 3 draws air from the second side of the mounting plate 1 and transports the air to the first side of the mounting plate 1. The air supply device 3 actively supplies air to the first side of the mounting plate 1, transporting the negative ions generated by the negative ion generator 2 to the first side of the mounting plate 1, thereby expanding the diffusion distance of the negative ions.

[0045] See also Figure 1 and Figure 2 The negative ion generating device of the present invention, the air supply device 3 includes a fan 31, the fan is a cross-flow fan, a plurality of air curtain exhaust holes 14 are provided on the mounting plate 1, and the cross-flow fan is installed on the mounting plate 1, and its air outlet side faces the exhaust curtain exhaust holes 14. When applied to the range hood, the air supply device 3 can generate a wind curtain. When the air supply device 3 is working, the fan 31 is started, the air inlet side of the fan 31 sucks air, and the exhaust side of the fan 31 exhausts air. The exhaust air of the fan 31 passes through the second side of the mounting plate 1 and the air curtain exhaust hole 14 on the mounting plate 1 and is discharged to the first side of the mounting plate 1. The downwardly discharged airflow forms a wind curtain. The wind curtain is located between the user and the stove, and is used to prevent the oil smoke generated when the user cooks from escaping to the user side, preventing the user from inhaling the escaped oil smoke; when the negative ion generator 2 is working, the emission end of the negative ion generator 2 discharges and ionizes the surrounding air to generate negative ions. The generated negative ions come into contact with pollutants in the air during the diffusion process, purify the pollutants in the air, and can play a role in purifying the air.

[0046] See also Figure 3 and Figure 4 ,exist Figure 3 and Figure 4In the embodiment of the negative ion generating device shown, the air supply device 3 includes a fan 31 and an air duct 32, the fan 31 is an axial flow fan, and one side of the air duct 32 has an air inlet 321, the axial flow fan is installed at the air inlet 321, and the cross-section of the air duct 32 gradually decreases from one end close to the axial flow fan to the end away from the axial flow fan. The bottom of the air duct 32 is connected to the second side of the mounting plate 1, and a plurality of uniform air holes 15 are provided on the mounting plate 1. The incoming air in the air duct 32 is discharged to the first side of the mounting plate 1 through the uniform air holes 15 and the air inlet channel. In the negative ion generating device of the present invention, the fan 31 is an axial flow fan, and the wind and the rotating shaft direction of the fan 31 are the same. Under the same power, the axial flow fan has the largest air suction volume and the highest wind speed, but the air supply distance of the axial flow fan is small. Therefore, when the fan 31 adopts an axial flow fan, the air inlet 321 is arranged on the side of the air duct 32; the fan 31 is arranged at the air inlet 321, and the axial flow fan directly draws air through the air inlet 321 and discharges the wind into the air duct 32, and the wind entering the uniform air hole 15 in the air duct 32 is discharged downward evenly to form a wind curtain. After the fan 31 draws the wind into the air duct 32, it flows along the air duct 32. If the cross-section of the air duct 32 is uniform, since the air volume and wind speed are relatively large on the side close to the air duct 32, after the wind enters the air duct 32, the air volume gradually decreases from the side close to the air duct 32 to the side away from the air duct 32. The air volume and wind speed of the part of the air duct 32 away from the fan 31 are the smallest. When the air duct 32 is discharged downward through the uniform air hole 15, the wind curtain is uneven. The part of the air duct 32 close to the fan 31 has a large air volume and a better effect of blocking oil smoke. The part of the air duct 32 away from the fan 31 has a thin air flow and a poor effect of blocking oil smoke. Oil smoke can easily escape from the thin air flow part of the air curtain. In order to ensure that the wind curtain formed by the air duct 32 exhausting air downward through the uniform air holes 15 has uniform wind speed and air volume in the left and right directions, the cross-section of the air duct 32 gradually decreases from the end close to the fan 31 to the end farthest from the fan 31. When the air in the air duct 32 is discharged downward through the uniform air component 3, a uniform wind curtain is formed, which has a better effect in blocking oil smoke.

[0047] See also Figure 3 and Figure 4 ,exist Figure 3 and Figure 4 In the illustrated embodiment of the negative ion generator, the top surface of the air duct 32 slopes downward from the end closest to the fan 31 to the end further away from the fan 31. The portion of the air duct 32 closer to the fan 31 has a higher top surface and a larger cross-sectional area, while the portion further away from the fan 31 has a lower top surface and a smaller cross-sectional area. This allows the airflow in the air duct 32 to form a uniform air curtain when it is discharged through the uniform air holes 15, effectively blocking oil smoke.

[0048] The negative ion generating device of the present invention, when applied to a range hood, can cooperate with the negative ion generator 2 and the fan 31 in a variety of ways. When the range hood has a smoke sensor, the fan 31 and the negative ion generator 2 can be linked to the smoke sensor. When the user is cooking, the fan 31 and the negative ion generator 2 are both started. The fan 31 can exhaust air downward through the air duct and generate a wind curtain to block the fumes generated by cooking from escaping outward. When the wind curtain wind passes through, the negative ions generated by the negative ion generator 2 are driven downward by the wind curtain wind. The negative ions flow downward with the wind curtain wind, and the downward diffusion distance becomes larger. They can flow through the corresponding inhalation range of the user's mouth and nose, purify the air at the corresponding position, and prevent the user from inhaling the escaped fumes. When flowing downward with the wind curtain wind, they will also diffuse in the left and right directions in the wind curtain wind, purifying the fumes mixed in the wind curtain wind, so that the user has a healthy cooking environment. When the user finishes cooking, the exhaust fan of the range hood is turned off, the fan 31 and the negative ion generator 2 are turned off, and the smoke sensor is started to monitor the backflow of oil smoke. The detection value of the smoke sensor is a range, and the detection range is set to ab, where a<c<b. The smoke sensor detects the oil smoke in the flue in real time when the exhaust fan is turned off, and sends a signal to the control system of the range hood. When the smoke concentration detected by the smoke sensor is greater than a and less than c, the control system of the range hood starts the negative ion generator 2. After the backflow of oil smoke escapes through the air intake of the range hood, it will be purified by the negative ions produced by the negative ion generator 2, which can make the kitchen air clean; when the smoke sensor detects that the concentration of oil smoke is greater than c and less than b When , the control system of the range hood starts the fan 31 and the negative ion generator 2. The fan 31 exhausts air downward to form an air curtain to prevent the backflow of oil smoke from escaping outward. The negative ion generator 2 generates negative ions, which flow downward with the wind of the wind curtain and diffuse in the wind of the wind curtain to purify the oil smoke flowing through the wind curtain; when the smoke sensor detects that the oil smoke concentration is greater than b, the control system of the range hood starts the exhaust fan of the range hood and turns off the start-up fan 31 and the negative ion generator 2. The exhaust fan works and sucks the air in the environment to discharge the backflow of oil smoke from the environment.

[0049] See also Figures 6 to 9The present invention also discloses a range hood, which adopts the above-mentioned negative ion generating device, including a range hood body 4, which has a cover plate 41, a top plate 42 and a mounting cavity located between the cover plate 41 and the top plate 42, the negative ion generating device is arranged in the mounting cavity, the top plate 42 is provided with a avoidance opening corresponding to the mounting plate 1, and an air supply device 3 is also provided in the mounting cavity, the air supply device 3 is installed on the second side of the mounting plate 1, the cover plate 41 is provided with an air curtain suction port 411 corresponding to the air supply device 3, the air supply device 3 sucks air from the air curtain suction port 411, and transports the air downward through the mounting plate 1. When the user is cooking, the range hood is turned on and the fan 31 and the negative ion generator 2 are running. The wind in the air duct 32 is discharged downward through the air uniformity holes 15 to form an air curtain. The air curtain can, to a certain extent, prevent the oil smoke produced by cooking from escaping outward when it flows toward the air intake of the range hood, reducing the possibility of the user inhaling oil smoke; when the negative ion generator 2 is running, the circuit board connects the high-voltage package to the circuit, and the current of the high-voltage package is transmitted to the metal cladding 22 through the wire 23. The current transmitted to the metal cladding 22 is transmitted along the metal cladding 22 and transmitted to the surface of the carbon fiber head 21, and then transported along the surface of the carbon fiber head 21 to the tip of the carbon fiber head 21. The tip of the carbon fiber head 21 discharges, ionizes the air and generates negative ions. During the negative ion generation process, when fan 31 draws air through air curtain inlet 411 and discharges it downward through uniform air holes 15, a portion of the airflow enters tank 11 through vent 12. This airflow is then discharged downward from tank 11, pushing the negative ions within tank 11 and the negative ions emitted by the negative ion generator 2 downward, increasing the diffusion distance of the negative ions. Furthermore, negative ion generator 2 generates negative ions by discharging at the tip of its carbon fiber head 21, ionizing the air. This allows air on the exhaust side of fan 31 to enter tank 11 through vent 12. This allows the carbon fiber head 21 to partially ionize the air within tank 11 and generate negative ions, increasing the amount of negative ions generated. After negative ions are generated, new air enters the tank and, while being ionized by the carbon fiber head 21, pushes the generated negative ions downward, allowing them to move into the inhalation range corresponding to the user's mouth and nose, purifying the air within this range and providing the user with a healthy cooking environment.

[0050] See also Figure 6 and Figure 9The range hood of the present invention has two sets of negative ion generating devices installed in the mounting cavity. The mounting plates 1 of the two sets of negative ion generating devices are arranged along the width direction of the top plate 42. The fans 31 of the two sets of negative ion generating devices are arranged on the side of the air duct 32 close to each other. The portion of the cover plate 41 corresponding to the two sets of negative ion generating devices is provided with an air curtain suction port 411. When the range hood is started, the two sets of negative ion generating devices on both sides of the range hood are started simultaneously. The fans 31 of the two sets of negative ion generating devices and the negative ion generator 2 are in operation. The fans 31 draw air through the air curtain suction port 411 and discharge air into the air duct 32. The airflow in the air duct 32 flows along the air duct 32 and is discharged downwardly through the air uniforming holes 15. During the process of the air in the air duct 32 being discharged downwardly through the air uniforming assembly 3, the air enters the receiving tank 11 through the vent 12, blowing the negative ions generated by the negative ion generator 2 downwardly, forming an air curtain containing negative ions on both sides of the range hood, which has a better effect of blocking and purifying oil smoke.

[0051] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements or improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A negative ion generating device for a range hood, characterized in that: include: A mounting plate (1) is provided with a receiving groove (11), the opening of the receiving groove (11) faces the first side of the mounting plate (1), and the mounting plate (1) is also provided with an air intake passage, so that airflow flowing from the second side of the mounting plate (1) to the first side of the mounting plate (1) enters the receiving groove (11) through the air intake passage and is discharged in a direction away from the second side of the mounting plate (1); A negative ion generator (2) is arranged in the containing groove (11) and is used to generate negative ions. The negative ions are discharged in a direction away from the second side of the mounting plate (1) along with the airflow entering the containing groove (11).

2. The negative ion generating device according to claim 1, characterized in that: The emission end of the negative ion generator (2) extends out of the first side of the mounting plate (1) by a distance x, and the head diameter of the emission end of the negative ion generator (2) is D1, where x≥D1.

3. The negative ion generating device according to claim 2, characterized in that: The head diameter of the emission end of the negative ion generator (2) is D1, and the lower edge diameter of the containing groove (11) is D2, where D2≥5mm>D1, and 2mm<D1<5mm.

4. The negative ion generating device according to claim 1, characterized in that: A vent hole (12) is provided at the top of the containing groove (11), and the vent hole (12) is connected to the channel of the containing groove (11) to form the air inlet channel.

5. The negative ion generating device according to claim 4, characterized in that: The head diameter of the emission end of the negative ion generator (2) is D1, the lower edge diameter of the containing groove (11) is D2, D2≥5mm, 2mm<D1<5mm, and the diameter of the vent hole (12) is D3, 1mm≤D3≤(D2-D1) / 2.

6. The negative ion generating device according to claim 1, characterized in that: The top of the containing tank (11) is provided with a mounting channel (13) and a vent hole (12) arranged around the mounting channel (13); the emission end of the negative ion generator (2) passes through the mounting channel (13) and extends into the containing tank (11); the gap between the portion of the negative ion generator (2) placed in the mounting channel (13) and the inner wall surface of the mounting channel (13) and the channel through which the vent hole (12) communicates with the containing tank (11) constitute the air inlet channel.

7. The negative ion generating device according to claim 1, characterized in that: It also comprises an air supply device (3), wherein the air supply device (3) transports air from the second side of the mounting plate (1) to the first side of the mounting plate (1).

8. The negative ion generating device according to claim 7, characterized in that: The air supply device (3) comprises a fan (31), which is a cross-flow fan. The mounting plate (1) is provided with a plurality of air curtain exhaust holes (14). The cross-flow fan is mounted on the mounting plate (1) with its air outlet side facing the air curtain exhaust holes (14).

9. The negative ion generating device according to claim 7, characterized in that: The air supply device (3) comprises a fan (31) and an air duct (32); the fan (31) is an axial flow fan; one side of the air duct (32) is provided with an air inlet (321); the axial flow fan is installed at the air inlet (321); the cross-section of the air duct (32) gradually decreases from one end close to the axial flow fan to one end far from the axial flow fan; the bottom of the air duct (32) is connected to the second side of the mounting plate (1); a plurality of uniform air holes (15) are provided on the mounting plate (1); the air in the air duct (32) is discharged to the first side of the mounting plate (1) through the uniform air holes (15) and the air inlet channel.

10. A range hood, using the negative ion generating device according to any one of claims 1 to 9, characterized in that: The range hood body (4) comprises a cover plate (41), a top plate (42) and an installation cavity located between the cover plate (41) and the top plate (42); the negative ion generating device is arranged in the installation cavity; the top plate (42) is provided with a avoidance opening corresponding to the installation plate (1); an air supply device (3) is also arranged in the installation cavity; the air supply device (3) is installed on the second side of the installation plate (1); the cover plate (41) is provided with an air curtain suction port (411) corresponding to the air supply device (3); the air supply device (3) sucks air from the air curtain suction port (411) and transports the air downward through the installation plate (1).

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