Anti-backflow range hood

Abstract

The utility model provides an anti-backflow range hood. The anti-backflow range hood comprises a smoke exhaust fan; the first air quality sensor is arranged on the smoke exhaust fan and is used for detecting whether backward flowing lampblack exists or not; a host body; the second air quality sensor is arranged in the main machine body and is used for detecting whether the concentration of the backward flowing oil smoke affects the air quality or not under the condition that the backward flowing oil smoke is detected by the first air quality sensor; the negative ion assembly and the air curtain assembly are arranged in the main machine body and used for preventing the backward flowing oil smoke from flowing out of the range hood, neutralizing the backward flowing oil smoke and improving the air quality; and the main control system can control the smoke exhaust fan, the negative ion assembly and the air curtain assembly according to results of the first air quality sensor and the second air quality sensor.

Description

Technical Field

[0001] The utility model relates to the technical field of range hoods, in particular to a range hood capable of preventing backflow. Background Art

[0002] The oil smoke produced by cooking will pollute the air and affect people's health. The range hood can absorb the oil smoke produced by cooking and discharge it to the outside or public flue, making the kitchen air cleaner. However, when the outlet flue is installed in the public flue, oil smoke backflow often occurs when the range hood is not started. For oil smoke backflow, the common method is to install a check valve. The check valve purchased by ordinary households mostly relies on elastic force to close the air outlet. However, its sealing effect is not ideal, and a small amount of oil smoke backflow will continue to exist. Some also install a rotary fan in the flue. When the oil smoke backflows, the fan drives the micro-generator to generate current, so as to monitor whether the oil smoke backflows. Others use an automatic transformer to make it have a backflow function. The automatic transformer intelligently adjusts the operating parameters of the variable frequency motor according to the change of the resistance of the air outlet to change the static pressure, thereby ensuring a good anti-oil smoke backflow effect. The above methods either have poor anti-oil smoke backflow effect, or are not ideal for relatively weak oil smoke backflow, or require the installation of additional devices, which is costly. Utility Model Content

[0003] Based on the above problems, the purpose of the utility model is to provide a range hood with anti-backflow function, comprising:

[0004] Smoke exhaust fan 9;

[0005] The first air quality sensor 3 is provided on the smoke exhaust fan 9 and is used to detect whether there is backflow of oil smoke;

[0006] Main body;

[0007] The second air quality sensor 2 is arranged in the main body, and is used to detect whether the concentration of the backflowing oil smoke affects the air quality when the first air quality sensor 3 detects the backflowing oil smoke;

[0008] The negative ion component 34 and the air curtain component 35 are arranged in the main body, and are used to prevent the backflow of oil smoke from flowing out of the range hood, and neutralize the backflow of oil smoke to improve the air quality;

[0009] The main control system can control the smoke exhaust fan 9, the negative ion component 34 and the air curtain component 35 according to the results of the first air quality sensor 3 and the second air quality sensor 2.

[0010] Furthermore, the main body includes a frame assembly 6 and a cover assembly 7, the frame assembly 6 is connected to the cover assembly 7 and encloses a telescopic inner cavity a, and a third detection hole a1 is provided at the bottom of the frame assembly 6.

[0011] Furthermore, the main body also includes a telescopic panel assembly 1, which is slidably connected in the telescopic inner cavity a, and a first detection hole 11 is provided on the top and a second detection hole 12 is provided on the bottom.

[0012] Furthermore, the main body also includes a driving component 8, which is arranged in the telescopic inner cavity a. The driving component 8 is connected to the telescopic panel component 1 and is used to drive the telescopic panel component 1 to extend or retract into the telescopic inner cavity a.

[0013] Furthermore, the second air quality sensor 2 is arranged in the installation cavity of the telescopic panel assembly 1, wherein when the telescopic panel assembly 1 retracts the telescopic inner cavity a, the second air quality sensor 2 is connected to the third detection hole a1 through the first detection hole 12, and the third detection hole a1 is connected to the outside.

[0014] Furthermore, the negative ion assembly 34 and the air curtain assembly 35 are both arranged in the installation cavity of the telescopic panel assembly 1 .

[0015] Furthermore, a wind curtain exhaust port corresponding to the wind curtain assembly 35 is provided at the bottom of the telescopic panel assembly 1. When the wind curtain assembly 35 is working, the wind curtain assembly 35 takes in air through the wind curtain inlet port and exhausts air through the wind curtain exhaust port to form a wind curtain located in front of the air intake port of the range hood.

[0016] Furthermore, a negative ion release port corresponding to the negative ion component 34 is provided at the bottom of the telescopic panel component 1. When the negative ion component 34 is working, the wind curtain component 35 works at the same time. The negative ions released by the negative ion component 34 enter the range hood along with the wind curtain airflow formed by the wind curtain component 35, thereby improving the air quality.

[0017] Furthermore, the smoke exhaust fan 9 has a volute, and the first air quality sensor 3 is arranged on the volute.

[0018] Furthermore, the range hood also includes a communication module, which is used to send a preliminary alarm to the user APP when the difference between the instant result detected by the second air quality sensor 2 and the base value exceeds a second threshold.

[0019] The beneficial effects of the utility model are:

[0020] 1. The first air quality sensor is linked with the second air quality sensor to quickly sense the backflow of oil smoke, and combined with the smoke exhaust fan, the backflow of oil smoke can be quickly disposed of.

[0021] 2. With the cooperation of the negative ion component and the air curtain component, the backflow of oil smoke is prevented from flowing out of the range hood. The negative ions released by the negative ion component enter the range hood in the air curtain airflow formed by the air curtain component, neutralize the backflow of oil smoke, and improve the air quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a cross-sectional view of the telescopic panel assembly of the anti-backflow range hood of the utility model after it extends out of the telescopic inner cavity;

[0023] Figure 2 It is an exploded view of the anti-backflow range hood of the utility model;

[0024] Figure 3 yes Figure 2 A schematic diagram of the structure of the telescopic panel assembly in another direction;

[0025] Figure 4 It is an exploded view of the telescopic panel assembly of the anti-backflow range hood of the utility model;

[0026] In the figure: a. telescopic inner cavity, a1. third detection hole, 1. telescopic panel assembly, 11. first detection hole, 12. second detection hole, 2. second air quality sensor, 3. first air quality sensor, 6. frame assembly, 7. cover assembly, 8. drive assembly, 9. smoke exhaust fan, 34. negative ion assembly, 35. air curtain assembly. DETAILED DESCRIPTION

[0027] In order to make the technical problems solved by the utility model, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the embodiments of the utility model will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0028] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions.

[0029] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0030] This embodiment provides an anti-backflow range hood, which can prevent oil fume from flowing back and ensure the quality of kitchen air. The range hood includes an exhaust fan 9, a first air quality sensor 3, a second air quality sensor 2, a negative ion component 34, an air curtain component 35, and a main control system.

[0031] Please refer to Figure 1 , the exhaust fan 9 has a volute. The first air quality sensor 3 is arranged on the volute, facing the main air inlet of the exhaust fan 9, and is used to detect whether there is backflow of oil fume. Specifically, it is used to detect whether the backflow of oil fume passes through the first detection area. When the range hood is turned off, if there is backflow of oil fume, the backflow of oil fume passes through the air inlet cavity of the exhaust fan 9 and flows out from the main air inlet of the exhaust fan 9, forming an air converging airflow at the main air inlet of the exhaust fan 9. This air converging airflow passes through the first detection area. Among them, the first detection area is the area between the main air inlet of the exhaust fan 9 and the air suction port of the range hood.

[0032] The first air quality sensor 3 is continuously online. When the range hood is turned off, the first air quality sensor 3 is not turned off and still continuously detects the air quality inside the range hood. When the range hood is turned off, if there is backflow of oil fume and the position in the first detection area exceeds a certain threshold, the exhaust fan 9 will be triggered to operate for exhausting fume. Specifically, the first air quality sensor 3 is set with a first threshold A0. When at time T1, the first air quality sensor 3 detects that the air quality in the first detection area is A1, and A1 > A0, the main control system controls the exhaust fan 9 to operate at 5% of the maximum speed. After the exhaust fan 9 operates at 5% of the maximum speed for a period of time t1, at time T2, the first air quality sensor 3 detects that the air quality in the first detection area is A2, and A2 < A1, then the main control system controls the exhaust fan 9 to operate at 3% of the maximum speed, otherwise, it continues to operate at 5% of the maximum speed.

[0033] Please refer to Figure 2 , Figure 3The range hood also includes: a main body, which includes a frame assembly 6 and a cover assembly 7, the frame assembly 6 is connected to the cover assembly 7 and encloses a telescopic inner cavity a, and a third detection hole a1 is provided at the bottom of the frame assembly 6; a telescopic panel assembly 1, which is slidably connected in the telescopic inner cavity a, and a first detection hole 11 is provided at the top and a first detection hole 12 is provided at the bottom; a second air quality sensor 2 is provided in the installation cavity of the telescopic panel assembly 1; a driving assembly 8, which is provided in the telescopic inner cavity a, and the driving assembly 8 is connected to the telescopic panel assembly 1, and is used to drive the telescopic panel assembly 1 to extend or retract the telescopic inner cavity a.

[0034] When the user is cooking, the exhaust fan 9 of the range hood works, the telescopic panel assembly 1 extends out of the telescopic inner cavity a, and the second air quality sensor 2 extends out of the telescopic inner cavity a along with the telescopic panel assembly 1 and detects the air quality of the cooking environment. When the user finishes cooking and the range hood is turned off, when the telescopic panel assembly 1 retracts into the telescopic inner cavity a, the second air quality sensor 2 is connected to the third detection hole a1 through the first detection hole 12, and the third detection hole a1 is connected to the outside, and the second air quality sensor 2 can continue to detect the air quality in the ambient air.

[0035] See also Figure 1 , Figure 4 The range hood further includes: a negative ion assembly 34 and an air curtain assembly 35, both of which are arranged in the installation cavity of the telescopic panel assembly 1. The bottom of the telescopic panel assembly 1 is provided with an air curtain exhaust port corresponding to the air curtain assembly 35. When the air curtain assembly 35 is working, the air curtain assembly 35 takes in air through the air curtain air inlet, and exhausts air through the air curtain exhaust port to form a wind curtain located in front of the air intake port of the range hood. The bottom of the telescopic panel assembly 1 is also provided with a negative ion release port corresponding to the negative ion assembly 34. When the negative ion assembly 34 is working, the air curtain assembly 35 works at the same time. The negative ions released by the negative ion assembly 34 enter the range hood along with the air curtain airflow formed by the air curtain assembly 35, thereby improving the air quality.

[0036] After the range hood is turned off, the telescopic panel assembly 1 retracts into the telescopic inner cavity a. The second air quality sensor 2 is communicated with the third detection hole a1 through the first detection hole 12, and the third detection hole a1 is communicated with the outside. The second air quality sensor 2 can continue to detect the air quality in the ambient air. When the range hood is turned off, if there is oil fume backflow and the backflowing oil fume continues to flow out, after passing through the first detection area and triggering the exhaust fan 9 to operate for exhaust, if it is still not completely cleared, it will enter the second detection area. Among them, the second detection area is the area below the main body of the range hood. Specifically, when the detection result of the first air quality sensor 3 does not exceed the threshold value A0, the detection frequency of the second air quality sensor 2 is the standby detection frequency f0. The standby detection frequency is generally set relatively low to reduce power consumption and save energy. However, when the detection result of the first air quality sensor 3 exceeds the threshold value A0, the detection frequency of the second air quality sensor 2 doubles to f1. At the same time, the second air quality sensor 2 detects the PM2.5 value of the current environment at the T3 moment as the base value Q0. When the detection result of the first air quality sensor 3 is less than the threshold value A0, the detection frequency of the second air quality sensor 2 resumes to the standby detection frequency f0. Further, the second air quality sensor 2 is provided with a second threshold value B0. The second air quality sensor 2 detects the PM2.5 value of the current environment at the T3 moment as the base value Q0. After a time t2, at the T4 moment, the immediate result of the second air quality sensor 2 detecting the PM2.5 value of the current environment is Q1. If Q1>Q0 and Q1-Q0>B0, the main control system turns on the negative ion component 34 and the air curtain component 35. The negative ions released by the negative ion component 34 flow into the range hood through the air inlet along with the air curtain airflow formed by the air curtain component 35 to improve the air quality. At the same time, the main control system controls the exhaust fan 9 to operate at 10% of the maximum speed. In addition, the main control system controls the communication module to send a preliminary warning to the user APP. After the above state passes through a time t3, at the T5 moment, the immediate result of the second air quality sensor 2 detecting the PM2.5 value of the current environment is Q2. If 0<Q2-Q0<1 / 2*B0, the main control system controls the air curtain fan of the air curtain component 35 to reduce to 50% of the maximum speed and at the same time keeps the negative ion component 34 operating. After the above state passes through a time t4, at the T6 moment, the immediate result of the second air quality sensor 2 detecting the PM2.5 value of the current environment is Q3. If 0<Q3-Q0≤1 / 4*B0, the main control system controls to turn off the negative ion component 34 and the air curtain component 35. At the same time, the main control system follows up the detection result of the first air quality sensor 3. If the detection result of the first air quality sensor 3 is lower than the first threshold value A0, the speed of the exhaust fan 9 is reduced. If the detection result of the first air quality sensor 3 is greater than the first threshold value A0, the speed of the exhaust fan 9 continues to be maintained.If at time T6, the immediate result of the PM2.5 value of the current environment detected by the second air quality sensor 2 is Q3, satisfying 0 < Q3 - Q0 ≤ 1 / 4 * B0, and the detection result of the first air quality sensor 3 is lower than the first threshold A0, and after an interval of Δt after T6, the immediate result of the PM2.5 value of the current environment detected by the second air quality sensor 2 is Q4, 0 < Q4 - Q0 ≤ 1 / 4 * B0, and the detection result of the first air quality sensor 3 is still lower than the first threshold A0, then the main control system controls to turn off the exhaust fan 9.

[0037] The first threshold A0 set by the first air quality sensor 3 and the second threshold B0 set by the second air quality sensor 2 can both be adjusted and set through the main control system.

Claims

1. A range hood with anti-backflow function, characterized in that: include: Smoke exhaust fan (9); A first air quality sensor (3) is provided on the smoke exhaust fan (9) and is used to detect whether there is backflow of oil smoke; Main body; A second air quality sensor (2) is disposed in the main body and is used to detect whether the concentration of backflowing oil smoke affects the air quality when the first air quality sensor (3) detects backflowing oil smoke; The negative ion component (34) and the air curtain component (35) are arranged in the main body and are used to prevent the backflow of oil smoke from flowing out of the range hood and neutralize the backflow of oil smoke to improve the air quality; A main control system, wherein the main control system is capable of controlling the smoke exhaust fan (9), the negative ion component (34) and the air curtain component (35) according to the results of the first air quality sensor (3) and the second air quality sensor (2).

2. The range hood with anti-backflow function according to claim 1, characterized in that: The main body comprises a frame assembly (6) and a cover assembly (7); the frame assembly (6) is connected to the cover assembly (7) and forms a telescopic inner cavity (a); a third detection hole (a1) is provided at the bottom of the frame assembly (6).

3. The range hood with anti-backflow function according to claim 2, characterized in that: The main body also includes a telescopic panel assembly (1), which is slidably connected in the telescopic inner cavity (a), and has a first detection hole (11) on its top and a second detection hole (12) on its bottom.

4. The range hood with anti-backflow function according to claim 3, characterized in that: The main body further comprises a driving component (8), which is arranged in the telescopic inner cavity (a); the driving component (8) is connected to the telescopic panel component (1) and is used to drive the telescopic panel component (1) to extend out of or retract into the telescopic inner cavity (a).

5. The range hood with anti-backflow function according to claim 4, characterized in that: The second air quality sensor (2) is arranged in the installation cavity of the telescopic panel assembly (1), wherein, when the telescopic panel assembly (1) retracts into the telescopic inner cavity (a), the second air quality sensor (2) is connected to the third detection hole (a1) through the second detection hole (12), and the third detection hole (a1) is connected to the outside.

6. The range hood with anti-backflow function according to claim 5, characterized in that: The negative ion component (34) and the air curtain component (35) are both arranged in the installation cavity of the telescopic panel component (1).

7. The range hood with anti-backflow function according to claim 6, characterized in that: The bottom of the telescopic panel assembly (1) is provided with an air curtain exhaust port corresponding to the air curtain assembly (35); when the air curtain assembly (35) is in operation, the air curtain assembly (35) takes in air through the air curtain inlet port and exhausts air through the air curtain exhaust port to form an air curtain located in front of the air intake port of the range hood.

8. The range hood with anti-backflow function according to claim 7, characterized in that: The bottom of the telescopic panel assembly (1) is provided with a negative ion release port corresponding to the negative ion assembly (34); when the negative ion assembly (34) is working, the air curtain assembly (35) works simultaneously; the negative ions released by the negative ion assembly (34) enter the range hood along with the air curtain airflow formed by the air curtain assembly (35), thereby improving air quality.

9. The range hood with backflow prevention according to claim 1, characterized in that: The smoke exhaust fan (9) has a volute, and the first air quality sensor (3) is arranged on the volute.

10. The range hood with backflow prevention according to claim 1, characterized in that: The range hood further comprises a communication module, which is used to send a preliminary warning to a user APP when the difference between the instantaneous result detected by the second air quality sensor (2) and the base value exceeds a second threshold value.

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