Air curtain device and range hood with same

Abstract

The utility model discloses an air curtain device and a range hood with the air curtain device, and the air curtain device comprises an air duct assembly which is provided with an air inlet, a first air outlet and a second air outlet; the cyclone engine lower cover is aligned with the first exhaust outlet and the second exhaust outlet, and an air curtain exhaust outlet is formed in the cyclone engine lower cover; the fan sucks air and exhausts the air into the air duct assembly through the air inlet, and the exhausted air in the air duct assembly is downwards exhausted through an air curtain exhaust outlet, aligned to the first exhaust outlet and the second exhaust outlet, in the lower cover of the cyclone engine to form an air curtain; compared with the prior art, according to the air curtain device disclosed by the utility model, when a user performs cooking operation and airflow formed by oil smoke flows towards the air suction opening of the range hood, the oil smoke on the surface of the airflow escapes outwards, and the escaped oil smoke is blocked by the air curtain when encountering the air curtain and then flows downwards along with the air direction of the air curtain; and the oil smoke is sucked into the exhaust inlet of the range hood at the downstream of the air curtain, so that the escape of the oil smoke can be reduced, and a healthy cooking environment is provided for users.

Description

Technical Field

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

[0002] When users are cooking, a large amount of oil fume is generated. When the range hood is started, the exhaust fan of the range hood forms a negative pressure at the air intake port. The oil fume generated by cooking flows toward the air intake port of the range hood under the action of the negative pressure, enters the air collecting box of the range hood through the air intake port, and is then discharged to the outdoors. In the process of the oil fume flowing toward the air intake port, part of the air flow surface formed by the oil fume will escape outward and be inhaled by the user. Long-term inhalation of oil fume will affect the user's health. Utility Model Content

[0003] The utility model aims to provide an air curtain device and a range hood having the same, which are used to solve the above-mentioned technical problems.

[0004] An air curtain device, used for a range hood, comprising:

[0005] An air duct component comprises an air inlet, a first air outlet and a second air outlet, wherein the first air outlet and the second air outlet are symmetrically arranged;

[0006] A cyclone engine lower cover, which is aligned with the first and second air outlets, and is provided with an air curtain air outlet;

[0007] The fan is installed at the air inlet, with the exhaust side of the fan facing the air duct assembly. The fan sucks air and exhausts air into the air duct assembly through the air inlet. The exhaust air in the air duct assembly is discharged downward through the wind curtain exhaust port on the lower cover of the cyclone engine aligned with the first exhaust port and the wind curtain exhaust port on the lower cover of the cyclone engine aligned with the second exhaust port to form a wind curtain.

[0008] According to one embodiment of the utility model, the air duct assembly includes an air inlet chamber, a first air sub-chamber and a second air sub-chamber, the air inlet is arranged in the air inlet chamber, the first air outlet is arranged in the first air sub-chamber, the second air outlet is arranged in the second air sub-chamber, and the air inlet chamber is arranged between the first air sub-chamber and the second air sub-chamber and is connected to the first air sub-chamber and the second air sub-chamber.

[0009] According to an embodiment of the utility model, the air intake chamber, the first air sub-chamber and the second air sub-chamber are an integrated structure, and the first air sub-chamber and the second air sub-chamber are located on both sides of the air intake chamber.

[0010] According to one embodiment of the present invention, the cross-section of the first air chamber gradually decreases from one end close to the air inlet chamber to one end away from the air inlet chamber, and the cross-section of the second air chamber gradually decreases from one end close to the air inlet chamber to one end away from the air inlet chamber.

[0011] According to one embodiment of the utility model, the top surface of the first air division chamber is inclined downward from top to bottom from one end close to the air intake chamber to one end away from the air intake chamber; the top surface of the second air division chamber is inclined downward from top to bottom from one end close to the air intake chamber to one end away from the air intake chamber.

[0012] According to one embodiment of the utility model, the air intake chamber, the first air sub-chamber and the second air sub-chamber are split structures, the air intake chamber is connected to the middle part of the first air sub-chamber through the first air duct, and the air intake chamber is connected to the middle part of the second air sub-chamber through the second air duct.

[0013] According to one embodiment of the utility model, a negative ion generator is further included, and the negative ion generator is used to generate negative ions, and the negative ions are discharged downward along with the air in the first air chamber and the second air chamber.

[0014] According to one embodiment of the utility model, the emitting end of the negative ion generator extends into the air inlet chamber, enters the first air chamber and the second air chamber under the action of the airflow in the air inlet chamber, and is discharged downward with the air in the first air chamber and the second air chamber; or there is respectively an emitting end of a negative ion generator extending into the first air chamber and the second air chamber, and is discharged downward with the air in the first air chamber and the second air chamber.

[0015] According to one embodiment of the utility model, a receiving groove with an opening facing downward is provided on the lower cover of the cyclone engine, a negative ion generator is placed in the receiving groove, an emitting end of the negative ion generator extends downward to the bottom of the lower cover of the cyclone engine, a plurality of ventilation holes are provided on the top of the receiving groove, air in the first air chamber and the second air chamber is discharged into the receiving groove through the ventilation holes, and negative ions are discharged downward along with the air in the receiving groove.

[0016] A range hood adopts the above-mentioned wind curtain device, including a range hood main body, the range hood main body has a cover plate, a top plate and an installation cavity located between the cover plate and the top plate, the wind curtain device is arranged in the installation cavity, the cover plate is provided with a wind curtain suction port corresponding to the fan, the cyclone engine lower cover is installed on the top plate, and the top plate is provided with an avoidance port corresponding to the cyclone engine lower cover.

[0017] Compared with the prior art, the air curtain device of the utility model has the following advantages:

[0018] The air curtain device of the utility model, when applied to the range hood, when the range hood performs smoke exhaust work, the fan is started, the fan sucks air through the air inlet and discharges the sucked air into the air duct assembly, the wind entering the air duct assembly flows along the air duct in the air duct assembly, and is downwardly discharged through the first air outlet and the second air outlet to form an air curtain, the air curtain wind is located between the user and the stove, when the user is cooking, when the airflow formed by the oil smoke flows toward the air suction port of the range hood, the oil smoke on the surface of the airflow will escape outward, when the escaping oil smoke encounters the air curtain, it will be blocked by the air curtain, and then flows downward with the wind curtain wind, and is sucked into the air suction port of the range hood downstream of the wind curtain wind, thereby reducing the escape of oil smoke and providing a healthy cooking environment for the user. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is an exploded view of the first embodiment of the air curtain device of the utility model;

[0020] Figure 2 A schematic structural diagram of an air duct assembly of an air curtain device according to a first embodiment;

[0021] Figure 3 It is an exploded view of the second embodiment of the air curtain device of the utility model (each has an emission end of a negative ion generator extending into the first air chamber and the second air chamber);

[0022] Figure 4 It is an exploded view of the third embodiment of the air curtain device of the utility model (the emission end of a negative ion generator extends into the air inlet chamber);

[0023] Figure 5 A rear view of the air curtain device of the third embodiment;

[0024] Figure 6 It is an exploded view of the fourth embodiment of the air curtain device of the utility model (the emission end of a negative ion generator extends into the air inlet chamber);

[0025] Figure 7 A schematic structural diagram of an air duct assembly of an air curtain device according to a fourth embodiment;

[0026] Figure 8 An exploded view of the fifth embodiment of the air curtain device of the utility model (each having an emission end of a negative ion generator extending into the first air chamber and the second air chamber);

[0027] Fig. 9 It is an exploded view of the sixth embodiment of the air curtain device of the utility model (each has an emission end of a negative ion generator extending below the lower cover of the cyclone engine);

[0028] Fig.10 A bottom view of the air curtain device of the utility model;

[0029] Fig.11 An exploded view of a range hood having the air curtain device of the first embodiment or the third embodiment;

[0030] Fig.12 An exploded view of a range hood having an air curtain device according to a fifth embodiment;

[0031] Fig.13 This is an exploded view of a negative ion generator;

[0032] In the figure: 1. air duct assembly, 1a. air intake chamber, 1b. first air distribution chamber, 1c. second air distribution chamber, 1d. first air duct, 1e. second air duct, 11. air inlet, 12. first air outlet, 13. second air outlet, 2. cyclone engine undercover, 21. wind curtain air outlet, 22. receiving groove, 23. air vent, 3. fan, 4. negative ion generator, 41. carbon fiber head, 42. metal cladding, 43. wire, 5. range hood body, 51. cover plate, 511. wind curtain air inlet, 52. top plate.

[0033] The realization of the functions and advantages of the utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0034] The following will disclose multiple embodiments of the present invention with drawings. For the purpose of clear description, many practical details will be described together in the following description. However, it should be understood that these practical details should not be used to limit the present invention. In other words, in some embodiments of the present invention, these practical details are not necessary. In addition, in order to simplify the drawings, some conventional structures and components will be depicted in a simple schematic manner in the drawings.

[0035] 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 components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0036] In addition, in the present utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes, and do not specifically refer to the order or sequence, nor are they used to limit the present utility model. 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 of the features. 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 utility model.

[0037] 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:

[0038] See also Figures 1 to 9 The utility model discloses an air curtain device, which is used for a range hood, and comprises an air duct assembly 1, a cyclone engine lower cover 2 and a fan 3. The air duct assembly 1 comprises an air inlet 11, a first air outlet 12 and a second air outlet 13, and the first air outlet 12 and the second air outlet 13 are symmetrically arranged; the cyclone engine lower cover 2 is aligned with the first air outlet 12 and the second air outlet 13, and an air curtain air outlet 21 is arranged on it; the fan 3 is installed at the air inlet 11, and the exhaust side of the fan 3 faces the air duct assembly 1. The fan 3 sucks air and exhausts air into the air duct assembly 1 through the air inlet 11, and the exhaust air in the air duct assembly 1 is discharged downward through the air curtain air outlet 21 on the cyclone engine lower cover 2 aligned with the first air outlet 12 and the air curtain air outlet 21 on the cyclone engine lower cover 2 aligned with the second air outlet 13 to form an air curtain. When the air curtain device of the utility model is applied to the range hood, when the range hood performs smoke exhaust work, the fan 3 is started, and the fan 3 sucks air through the air inlet 11 and discharges the sucked air into the air duct assembly 1. The wind entering the air duct assembly 1 flows along the air duct in the air duct assembly 1, and is downwardly discharged through the first air outlet 12 and the second air outlet 13 to form an air curtain. The air curtain wind is located between the user and the stove. When the user is cooking, when the airflow formed by the oil smoke flows toward the air intake port of the range hood, the oil smoke on the surface of the airflow will escape outward. When the escaping oil smoke encounters the air curtain, it will be blocked by the air curtain, and then flow downward with the wind curtain wind, and be sucked into the air intake port of the range hood downstream of the wind curtain wind, thereby reducing the escape of oil smoke and providing a healthy cooking environment for the user.

[0039] See also Figure 2 , Figure 5 and Figure 7The wind curtain device of the utility model, the air duct assembly 1 includes an air inlet chamber 1a, a first air chamber 1b and a second air chamber 1c, an air inlet 11 is arranged in the air inlet chamber 1a, a first air outlet 12 is arranged in the first air chamber 1b, and a second air outlet 13 is arranged in the second air chamber 1c. The air inlet chamber 1a is arranged between the first air chamber 1b and the second air chamber 1c and is connected with the first air chamber 1b and the second air chamber 1c. When the fan 3 is started, the fan 3 sucks air and discharges the airflow into the air inlet chamber 1a. The airflow entering the air inlet chamber 1a flows toward the first air chamber 1b and the second air chamber 1c on both sides of the air inlet chamber 1a, and then is discharged through the first air outlet 12 corresponding to the first air chamber 1b and the second air outlet 13 corresponding to the second air chamber 1c, forming two air curtains, each of which corresponds to a stove head, which can better block the escape of oil smoke. The wind curtain device of the utility model uses only one fan 3 to deliver air to the first air chamber 1b and the second air chamber 1c on both sides of the air duct assembly 1, and forms a wind curtain on both sides of the range hood, saving one fan 3 and reducing costs.

[0040] See also Figures 1 to 5 In some embodiments of the wind curtain device, the air inlet chamber 1a, the first air sub-chamber 1b and the second air sub-chamber 1c are an integrated structure, and the first air sub-chamber 1b and the second air sub-chamber 1c are located on both sides of the air inlet chamber 1a. When the air inlet chamber 1a, the first air sub-chamber 1b and the second air sub-chamber 1c are an integrated structure, the fan 3 adopts an axial flow fan, and the wind and the rotation axis direction of the fan 3 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 3 adopts an axial flow fan, the air inlet chamber 1a, the first air sub-chamber 1b and the second air sub-chamber 1c are an integrated structure, and the axial flow fan sucks a large amount of wind into the air inlet chamber 1a, and then flows from the air inlet chamber 1a to the first air sub-chamber 1b and the second air sub-chamber 1c on both sides of the air inlet chamber 1a, and forms two wind curtains when it is discharged downward from the first air sub-chamber 1b and the second air sub-chamber 1c.

[0041] See also Figures 1 to 5In an embodiment of a wind curtain device in which the air inlet chamber 1a, the first air sub-chamber 1b and the second air sub-chamber 1c are an integrated structure, the cross-section of the first air sub-chamber 1b gradually decreases from the end close to the air inlet chamber 1a to the end far from the air inlet chamber 1a, and the cross-section of the second air sub-chamber 1c gradually decreases from the end close to the air inlet chamber 1a to the end far from the air inlet chamber 1a. After the fan 3 draws the wind into the air inlet chamber 1a, it is diverted from the air inlet chamber 1a to the first air sub-chamber 1b and the second air sub-chamber 1c on both sides thereof. If the cross-sections of the first air sub-chamber 1b and the second air sub-chamber 1c are uniform, since the wind volume and wind speed on the side of the first air sub-chamber 1b and the second air sub-chamber 1c close to the air inlet chamber 1a are relatively large, after the wind enters the first air sub-chamber 1b and the second air sub-chamber 1c, the wind volume gradually decreases from the side close to the air inlet chamber 1a to the side far from the air inlet chamber 1a. The gradient is small, and the air volume and wind speed of the first air chamber 1b and the second air chamber 1c far away from the air inlet chamber 1a are the smallest. When the first air chamber 1b and the second air chamber 1c exhaust air downward through the first exhaust port 12 and the second exhaust port 13, the wind curtain wind is uneven, the air volume is large in the part close to the air inlet chamber 1a, and the effect of blocking the oil fume is better. The airflow in the part far away from the air inlet chamber 1a is thin, and the effect of blocking the oil fume is poor. The oil fume can easily escape from the thin airflow of the wind curtain. In order to make the wind curtain formed by the downward exhaust of the first air chamber 1b and the second air chamber 1c through the first exhaust port 12 and the second exhaust port 13 have uniform wind speed and air volume in the left and right directions, the cross-section of the first air chamber 1b gradually decreases from the end close to the air intake chamber 1a to the end far away from the air intake chamber 1a, and the cross-section of the second air chamber 1c gradually decreases from the end close to the air intake chamber 1a to the end far away from the air intake chamber 1a. When the airflows of the first air chamber 1b and the second air chamber 1c are discharged from the first exhaust port 12 and the second exhaust port 13, a uniform wind curtain is formed, which has a better effect in blocking oil smoke.

[0042] See also Figures 1 to 5 In the embodiment of the wind curtain device in which the air inlet chamber 1a, the first air sub-chamber 1b and the second air sub-chamber 1c are an integrated structure, the top surface of the first air sub-chamber 1b is tilted downward from the end close to the air inlet chamber 1a to the end far from the air inlet chamber 1a; the top surface of the second air sub-chamber 1c is tilted downward from the end close to the air inlet chamber 1a to the end far from the air inlet chamber 1a. The top surface height of the first air sub-chamber 1b and the second air sub-chamber 1c closer to the air inlet chamber 1a is higher and the cross-sectional area is larger; the top surface height of the part farther away from the air inlet chamber 1a is lower and the cross-sectional area is larger. When the airflow in the first air sub-chamber 1b and the second air sub-chamber 1c is discharged through the first exhaust port 12 and the second exhaust port 13, a uniform wind curtain is formed, which has a better effect of blocking oil smoke.

[0043] See also Figures 6 to 9In other embodiments of the wind curtain device, the air inlet chamber 1a, the first air chamber 1b and the second air chamber 1c are split structures, the air inlet chamber 1a is connected to the middle of the first air chamber 1b through the first air duct 1d, and the air inlet chamber 1a is connected to the middle of the second air chamber 1c through the second air duct 1e. When the fan 3 is started, the fan 3 sucks air and discharges it into the air inlet chamber 1a. The airflow entering the air inlet chamber 1a enters the first air chamber 1b through the first air duct 1d, and enters the second air chamber 1c through the second air duct 1e. The air in the first air chamber 1b is discharged downward through the first exhaust port 12 below the first air chamber 1b to form a wind curtain, and the air in the second air chamber 1c is discharged downward through the second exhaust port 13 below the second air chamber 1c to form a wind curtain. Only one fan 3 is used to deliver air to the first air chamber 1b and the second air chamber 1c on both sides of the air duct assembly 1, forming a wind curtain containing negative ions on both sides of the range hood, which has a better effect of blocking and purifying oil smoke, and saves one fan 3, which can reduce costs. In the embodiment where the air inlet chamber 1a, the first air chamber 1b and the second air chamber 1c are split structures, the fan 3 is a cross-flow fan, and the wind comes in from the blades of the fan 3, leaves the blades and enters the air inlet chamber 1a, which has low noise and can improve user experience.

[0044] See also Figures 1 to 9 The wind curtain device of the utility model also includes a negative ion generator 4, which is used to generate negative ions, and the negative ions are discharged downward along with the air in the first air chamber 1b and the second air chamber 1c. When applied to the range hood, when the range hood performs smoke exhaust work, the fan 3 is started, and the fan 3 sucks air through the air inlet 11 and discharges the sucked air into the air duct. The air entering the air duct flows along the air duct and is discharged downward through the first air outlet 12 and the second air outlet 13 to form a wind curtain. When the range hood is running, the negative ion generator 4 is started at the same time, and the negative ions generated by the negative ion generator 4 are discharged downward along with the wind curtain wind discharged from the first air outlet 12 and the second air outlet 13, so that the wind curtain wind contains negative ions. When oil smoke escapes outward and passes through the wind curtain, the oil smoke will be blocked by the wind curtain, and the oil smoke mixed in the wind curtain will be purified by negative ions, so that users have a healthy cooking environment.

[0045] The negative ion generating device of the utility model, when applied to the range hood, has multiple matching modes between the negative ion generator 4 and the fan 3. When the range hood has a smoke sensor, the fan 3 and the negative ion generator 4 can be linked with the smoke sensor. When the user is cooking, the fan 3 and the negative ion generator 4 are both started, and the fan 3 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 flows through, the negative ions generated by the negative ion generator 4 are driven downward by the wind curtain wind, and the negative ions flow downward with the wind curtain wind. The downward diffusion distance becomes larger, and 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 escaping fumes. When flowing downward with the wind curtain wind, it will also diffuse in the left and right directions in the wind curtain wind, purify the fumes mixed in the wind curtain wind, and provide the user with a healthy cooking environment. When the user finishes the cooking operation, the exhaust fan of the range hood is turned off, the fan 3 and the negative ion generator 4 are turned off, and the smoke sensor is started, and the smoke sensor monitors the backflow of fumes. 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 situation in the flue in real time when the smoke 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 4. After the backflow of oil smoke escapes through the air intake port of the range hood, it will be purified by the negative ions produced by the negative ion generator 4, so that the kitchen air can be cleaned; when the smoke sensor detects that the concentration of oil smoke is greater than c and less than c, the smoke sensor starts the negative ion generator 4. At b, the control system of the range hood starts the fan 3 and the negative ion generator 4. The fan 3 exhausts air downward to form a wind curtain to prevent the backflow of oil smoke from escaping outward. The negative ion generator 4 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 passing 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 smoke exhaust fan of the range hood and turns off the start-up fan 3 and the negative ion generator 4. The smoke exhaust fan works and sucks the air in the environment to discharge the backflow of oil smoke from the environment.

[0046] See also Figures 4 to 6In some embodiments of the air curtain device with a negative ion generator 4, the emitting end of the negative ion generator 4 extends into the air inlet chamber 1a, enters the first air chamber 1b and the second air chamber 1c under the action of the airflow in the air inlet chamber 1a, and is discharged downward along with the air in the first air chamber 1b and the second air chamber 1c; or there is an emitting end of the negative ion generator 4 extending into the first air chamber 1b and the second air chamber 1c, and is discharged downward along with the air in the first air chamber 1b and the second air chamber 1c. When the fan 3 starts and draws air into the air intake chamber 1a, the negative ion generator 4 starts and releases negative ions into the air intake chamber 1a. After the airflow sucked in by the fan 3 through the air inlet 11 enters the air intake chamber 1a, the airflow mixes the negative ions evenly, and then enters the first sub-chamber 1b and the second sub-chamber 1c through the air intake chamber 1a respectively. The air discharged downward from the first sub-chamber 1b and the second sub-chamber 1c through the first exhaust port 12 and the second exhaust port 13 contains negative ions. The negative ions in the formed wind curtain are distributed more evenly, and the purification effect on oil smoke is better.

[0047] See also Figure 3 and Figure 8 In some embodiments of the wind curtain device with the negative ion generator 4, there is a transmitting end of the negative ion generator 4 extending into the first air chamber 1b and the second air chamber 1c, and discharged downward with the air in the first air chamber 1b and the second air chamber 1c. When the fan 3 is started and delivers air to the air inlet chamber 1a, the negative ion generator 4 is started and releases negative ions into the first air chamber 1b and the second air chamber 1c. After the air in the air inlet chamber 1a enters the first air chamber 1b and the second air chamber 1c through the first air inlet pipe 1d and the second air inlet pipe 1e, it is mixed with the negative ions in the first air chamber 1b and the second air chamber 1c, and then the negative ions are discharged downward through the first exhaust port 12 and the second exhaust port 13, forming a wind curtain containing negative ions. The negative ion content in the wind curtain is relatively uniform, and the purification effect on oil smoke is better. In this embodiment, the emission end of each negative ion generator 4 extends into the first air chamber 1b and the second air chamber 1c, the amount of negative ions generated is greater, the negative ion content in the formed wind curtain is higher, and the air purification effect is better. In addition, each of the first air chamber 1b and the second air chamber 1c has a negative ion generator 4 to generate negative ions therein, and when any one of the negative ion generators 4 fails, it will not affect the use of the other negative ion generator 4.

[0048] See also Figure 1 and Fig. 9In some other embodiments, the emission end of the negative ion generator 4 extends downward to the lower ends of the first exhaust port 12 and the second exhaust port 13. First, the emitting end of the negative ion generator 4 extends downward to below the first air outlet 12 and the second air outlet 13, so that the negative ion generator 4 is as close as possible to the inhalation range corresponding to the user's mouth and nose, so that when the negative ions are blown downward by the wind curtain wind generated by the fan 3 through the air duct assembly 1 and flow downward, they can quickly reach the inhalation range corresponding to the user's mouth and nose, and the negative ions are consumed less, which can improve the purification effect of the air in the inhalation range corresponding to the user's mouth and nose; secondly, if the emitting end of the negative ion generator 4 is placed in the air duct, in terms of distance, the distance from the negative ion generator 4 to the inhalation range corresponding to the user's mouth and nose is increased, and the negative ions generated by the negative ion generator 4 may be mostly consumed when flowing through the inhalation range corresponding to the user's mouth and nose, and the purification effect of the air in the inhalation range corresponding to the user's mouth and nose is weakened; in addition, if the emitting head of the negative ion generator 4 does not extend from the first air outlet 12 and the second air outlet 13, the air flow at the emitting head of the negative ion generator 4 is not smooth, affecting the generation of negative ions.

[0049] See also Fig.13 The negative ion generator 4 includes a carbon fiber head 41 and a metal cladding 42. The metal cladding 42 wraps one end of the carbon fiber head 41. The metal cladding 42 is connected to a high-voltage package through a wire 43, and the high-voltage package is connected to the circuit board of the range hood. When the negative ion generator 4 is required to generate negative ions, 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 42 through the wire 43. The current transmitted to the metal cladding 42 is transmitted along the metal cladding 42 and transmitted to the surface of the carbon fiber head 41, and then transmitted along the surface of the carbon fiber head 41 to the tip of the carbon fiber head 41. The tip of the carbon fiber head 41 discharges, ionizes the air and generates negative ions. The tip of the carbon fiber head 41 is one end away from the metal cladding 42, so that the negative ions generated by the discharge of the tip of the carbon fiber head 41 are not easily extinguished by the metal cladding 42.

[0050] In the negative ion generating device of the utility model, at least the tip of the carbon fiber head 41 is wrapped with PDG organic gel, and the hydrophilic polymer chains and solvent molecules on the surface of the gel can effectively capture gaseous water molecules in the air, and then the water molecules are liquefied and further quickly conducted to the inside of the polymer gel network by the solvent molecules. Since the polymer gel can swell in a large size under the action of water, the volume hidden by itself can swell several times while still maintaining good strength, the water molecules adsorbed inside can be effectively bound to the inside by the polymer chain without obvious leakage and leakage, so the diluted polymer organic gel can effectively capture water molecules in the air and well accommodate and store water molecules. The polymer hygroscopic gel on the surface of the carbon fiber head 41 transfers the adsorbed water molecules to the surface of the carbon fiber head 41 through the hydrophilic effect of the surface of the carbon fiber head 41, and then transfers them to the top of the carbon fiber head 41 by using the water absorption and capillary action of the carbon fiber head 41, and enriches at the tip of the carbon fiber head 41, and then generates negative oxygen ions under voltage.

[0051] In the negative ion generating device of the utility model, the resistance at the metal cladding 42 is R1, the resistance at the tip of the metal cladding 42 connecting one end of the wire 43 to the carbon fiber head 41 is R2, the resistance at the wire 43 is R3, and the resistance at the part of the metal cladding 42 connecting one end of the wire 43 to the middle of the carbon fiber head 41 is R4, then: R3<R1<R2<R4, 2Ω<R1<3.5Ω, 8Ω<R2<13Ω, 1Ω<R3<2Ω, 15Ω<R4<18Ω. The resistance at the carbon fiber head 41 is the smallest, and the voltage flowing therethrough is the largest. When the tip of the carbon fiber head 41 discharges, more negative ions are generated by ionizing the air.

[0052] See also Figure 1 and Fig. 9 In the wind curtain device with the negative ion generator 4 in this embodiment, a receiving groove 22 with an opening facing downward is provided on the cyclone engine lower cover 2, and the negative ion generator 4 is placed in the receiving groove. The emission end of the negative ion generator 4 extends downward to the bottom of the cyclone engine lower cover 2. A plurality of vents 23 are provided on the top of the receiving groove 22. The air in the first air chamber 1b and the second air chamber 1c is discharged into the receiving groove through the vents 23, and the negative ions are discharged downward along with the air in the receiving groove. After the negative ion generator 4 is powered on, when the portion of the carbon fiber head 41 of the negative ion generator 4 extending out of the metal cladding 42 contacts the air, the air can be ionized and negative ions can be generated. The receiving groove 22 with an opening facing downward is provided on the cyclone engine lower cover 2, and the portion of the carbon fiber head 41 of the negative ion generator 4 placed in the receiving groove 22 will also contact the air in the receiving groove 22, ionize the air and generate negative ions, which can increase the amount of negative ions generated.

[0053] The head diameter of the emitting end of the negative ion generator 4 is D1, and the lower edge diameter of the containing groove 22 is D2, D2≥5mm>D1, 2mm<D1<5mm. The lower edge diameter of the containing groove 22 is larger than the head diameter of the emitting end of the negative ion generator 4, and the emitting end of the negative ion generator 4 will not contact the wall surface of the containing groove 22. The larger the space of the containing groove 22 surrounding the negative ion generator 4, the more negative ions are generated, and the less negative ions are eliminated when flowing out of the containing groove 22, which can improve the purification effect of the negative ions generated by the negative ion generator 4.

[0054] See also Figure 1 , Fig. 9 and Fig.10A plurality of vents 23 are provided at the top of the receiving tank 22. The air discharged from the first exhaust port 12 and the second exhaust port 13 is discharged into the receiving tank 22 through the vents 23. The negative ions are discharged downward along with the air in the receiving tank 22. The diameter of the lower edge of the receiving tank 22 is D2, D2 ≥ 5 mm, and the diameter of the vent 23 is D3, 1 mm ≤ D3 ≤ (D2-D1) / 2. When the fan 3 is started, the fan 3 discharges air downward through the cyclone engine lower cover 2, and the air on the exhaust side of the fan 3 enters the air inlet chamber 1a, and then is introduced into the first sub-chamber 1b and the second sub-chamber 1c by the first air duct 1d and the second air duct 1e respectively. When the air entering the first sub-chamber 1b and the second sub-chamber 1c is discharged downward through the cyclone engine lower cover 2 on the corresponding side, it can enter the receiving tank 22 through the vent 23, and the negative ions in the receiving tank 22 and the negative ions at the emission end of the negative ion generator 4 are blown downward, increasing the diffusion distance of the negative ions. In addition, the negative ion generator 4 generates negative ions in the way that the tip of the carbon fiber head 41 of the negative ion generator 4 discharges and ionizes the air, so that the air on the exhaust side of the fan 3 enters the receiving tank 22 through the vent 23, so that the part of the carbon fiber head 41 located in the receiving tank 22 can ionize the air and generate negative ions, thereby increasing the amount of negative ions generated. After the negative ions are generated, new air enters the receiving groove 22, and while being ionized by the carbon fiber head 41, the negative ions generated by the ionization are blown downward, so that the negative ions can move to the corresponding inhalation range of the user's mouth and nose, and purify the air in this range, so that the user has a healthy cooking environment. When the negative ion generator 4 is installed in the receiving groove 22, the top of the receiving groove 22 has an installation channel, and the carbon fiber head 41 of the negative ion generator 4 is placed in the receiving groove 22 through the installation channel, and the emission end extends from the receiving groove 22. At this time, the width of the ring around the installation channel is D2-D1, and the diameter D3 of the vent 23 must satisfy D3≤(D2-D1) / 2. When D3=(D2-D1) / 2, the vent 23 can form an installation channel, and the carbon fiber head 41 directly passes through the vent 23 into the receiving groove 22, and the emission end extends out of the receiving groove 22.When the direct D3 of the vent hole 23 is less than (D2-D1) / 2, the vent hole 23 is a hole arranged on a ring surrounding the installation channel and connected to the receiving groove 22. The larger the aperture of the vent hole 23, the smaller the wind resistance when the air in the first air chamber 1b and the second air chamber 1c enter the receiving groove 22 through the vent hole 23, the smaller the speed of the air flow entering the receiving groove 22, and the smaller the distance that the air flow out of the receiving groove 22 blows the negative ions. The smaller the aperture of the vent hole 23, the smaller the air in the first air chamber 1b and the second air chamber 1c passes through the vent hole. The greater the wind resistance when the vent 23 enters the receiving groove 22, the greater the speed of the airflow entering the receiving groove 22, and the greater the distance that the airflow flowing out of the receiving groove 22 blows the negative ions. However, if the aperture of the vent 23 is too small, it will affect the amount of air entering the receiving groove 22 and generate noise. Therefore, in this embodiment, the aperture D3 of the vent 23 satisfies 1mm≤D3, which can not only ensure the amount of air entering the receiving groove 22, but also make the air entering the receiving groove 22 have sufficient wind speed to blow the negative ions to the corresponding inhalation range of the user's mouth and nose.

[0055] See also Figure 1 , Fig. 9 and Fig.10 ,exist Figure 1 , Fig. 9 and Fig.10 In the illustrated embodiment, the receiving grooves 22 are arranged in an array around the negative ion generators 4. When the fan 3 is started, the air in the first air chamber 1b and the second air chamber 1c enters the receiving groove 22 through the vent 23, and a plurality of air flows surrounding the carbon fiber head 41 are uniformly formed, and the carbon fiber head 41 located in the receiving groove 22 partially ionizes the air entering the receiving groove 22 to generate negative ions, and the generated negative ions flow downward with the air entering the receiving groove 22 and blow downward a large number of negative ions generated by the ionized air at the tip of the carbon fiber head 41.

[0056] See also Fig.11 and Fig.12The utility model also discloses a range hood. The range hood disclosed in the utility model adopts the above-mentioned wind curtain device, including a range hood body 5. The range hood body 5 has a cover plate 51, a top plate 52 and an installation cavity located between the cover plate 51 and the top plate 52. The wind curtain device is arranged in the installation cavity. The cover plate 51 is provided with a wind curtain suction port 511 corresponding to the fan 3. The cyclone engine lower cover 2 is installed on the top plate 52. The top plate 52 is provided with an avoidance port corresponding to the cyclone engine lower cover 2. When the user is cooking, the range hood is turned on and the fan 3 and the negative ion generator 4 are running. The wind in the first air chamber 1b and the second air chamber 1c is exhausted downward through the cyclone engine lower cover 2, and the wind is discharged downward from the wind curtain exhaust port 21 on the cyclone engine lower cover 2 to form a wind curtain. The wind curtain can to a certain extent block the fumes produced by cooking from escaping outward when flowing to the air intake port of the range hood, thereby reducing the possibility of users inhaling fumes. When the negative ion generator 4 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 42 through the wire 33. The current transmitted to the metal cladding 42 is transmitted along the metal cladding 42 and transmitted to the surface of the carbon fiber head 41, and then transported along the surface of the carbon fiber head 41 to the tip of the carbon fiber head 41. The tip of the carbon fiber head 41 discharges, ionizes the air and generates negative ions. During the process of generating negative ions, when the fan 3 sucks air through the air curtain suction port 511 and exhausts air downward through the cyclone engine lower cover 2, part of the air flow enters the receiving tank 22 through the vent 23, and then is discharged downward from the receiving tank 22, blowing the negative ions in the receiving tank 22 and the negative ions at the emission end of the negative ion generator 4 downward, thereby increasing the diffusion distance of the negative ions. In addition, the negative ion generator 4 generates negative ions by discharging the tip of the carbon fiber head 41 of the negative ion generator 4 to ionize the air, so that the air on the exhaust side of the fan 3 enters the receiving tank 22 through the vent 23, so that the carbon fiber head 41 can partially ionize the air in the receiving tank 22 and generate negative ions, thereby increasing the amount of negative ions generated. After the negative ions are generated, new air enters the receiving tank, and while being ionized by the carbon fiber head 41, the negative ions generated by the ionization are blown downward, so that the negative ions can move to the corresponding inhalation range of the user's mouth and nose, and purify the air in the range, so that the user has a healthy cooking environment.

[0057] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions or improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An air curtain device for a range hood, characterized in that: include: An air duct assembly (1), comprising an air inlet (11), a first air outlet (12) and a second air outlet (13), wherein the first air outlet (12) and the second air outlet (13) are symmetrically arranged; A cyclone engine lower cover (2), which is aligned with the first air outlet (12) and the second air outlet (13), and is provided with an air curtain air outlet (21); A fan (3) is installed at the air inlet (11), the exhaust side of the fan (3) faces the air duct assembly (1), the fan (3) sucks air and exhausts air into the air duct assembly (1) through the air inlet (11), and the exhaust air in the air duct assembly (1) is discharged downwards through the wind curtain exhaust port (21) on the cyclone engine lower cover (2) aligned with the first exhaust port (12) and the wind curtain exhaust port (21) on the cyclone engine lower cover (2) aligned with the second exhaust port (13) to form a wind curtain.

2. The air curtain device according to claim 1, characterized in that: The air duct assembly (1) comprises an air inlet chamber (1a), a first air distribution chamber (1b) and a second air distribution chamber (1c); the air inlet (11) is arranged in the air inlet chamber (1a); the first air outlet (12) is arranged in the first air distribution chamber (1b); the second air outlet (13) is arranged in the second air distribution chamber (1c); the air inlet chamber (1a) is arranged between the first air distribution chamber (1b) and the second air distribution chamber (1c) and is in communication with the first air distribution chamber (1b) and the second air distribution chamber (1c).

3. The air curtain device according to claim 2, characterized in that: The air intake chamber (1a), the first air distribution chamber (1b) and the second air distribution chamber (1c) are an integrated structure, and the first air distribution chamber (1b) and the second air distribution chamber (1c) are located on both sides of the air intake chamber (1a).

4. The air curtain device according to claim 3, characterized in that: The cross section of the first air distribution chamber (1b) gradually decreases from one end close to the air inlet chamber (1a) to one end away from the air inlet chamber (1a), and the cross section of the second air distribution chamber (1c) gradually decreases from one end close to the air inlet chamber (1a) to one end away from the air inlet chamber (1a).

5. The air curtain device according to claim 4, characterized in that: The top surface of the first air dividing chamber (1b) is arranged to be inclined downward from top to bottom from one end close to the air inlet chamber (1a) to one end away from the air inlet chamber (1a); and the top surface of the second air dividing chamber (1c) is arranged to be inclined downward from top to bottom from one end close to the air inlet chamber (1a) to one end away from the air inlet chamber (1a).

6. The air curtain device according to claim 2, characterized in that: The air intake chamber (1a), the first air distribution chamber (1b) and the second air distribution chamber (1c) are split structures; the air intake chamber (1a) is connected to the middle of the first air distribution chamber (1b) via a first air duct (1d), and the air intake chamber (1a) is connected to the middle of the second air distribution chamber (1c) via a second air duct (1e).

7. The air curtain device according to claim 2, characterized in that: It also comprises a negative ion generator (4), which is used to generate negative ions, and the negative ions are discharged downward along with the air in the first air distribution chamber (1b) and the second air distribution chamber (1c).

8. The air curtain device according to claim 7, characterized in that: The emission end of the negative ion generator (4) extends into the air inlet chamber (1a), enters the first air chamber (1b) and the second air chamber (1c) under the action of the airflow in the air inlet chamber (1a), and is discharged downwards along with the air in the first air chamber (1b) and the second air chamber (1c); or one emission end of the negative ion generator (4) extends into the first air chamber (1b) and the second air chamber (1c), and is discharged downwards along with the air in the first air chamber (1b) and the second air chamber (1c).

9. The air curtain device according to claim 7, characterized in that: The cyclone engine lower cover (2) is provided with a receiving groove (22) with an opening facing downward, the negative ion generator (4) is placed in the receiving groove, the emission end of the negative ion generator (4) extends downward to the bottom of the cyclone engine lower cover (2), and a plurality of ventilation holes (23) are opened on the top of the receiving groove (22), and the air in the first air chamber (1b) and the second air chamber (1c) is discharged into the receiving groove through the ventilation holes (23), and the negative ions are discharged downward along with the air in the receiving groove.

10. A range hood, using the air curtain device according to any one of claims 1 to 8, characterized in that: The range hood body (5) comprises a cover plate (51), a top plate (52) and an installation cavity located between the cover plate (51) and the top plate (52); the wind curtain device is arranged in the installation cavity; the cover plate (51) is provided with a wind curtain air suction port (511) corresponding to the fan (3); the cyclone engine lower cover (2) is installed on the top plate (52); and the top plate (52) is provided with an escape port corresponding to the cyclone engine lower cover (2).

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