Fresh air conditioner wind backflow prevention device and control method

Abstract

The invention provides a fresh air conditioner wind backflow prevention device and a control method. The control method comprises the steps that the air flow speed of the outdoor side is measured through an air volume sensor, and the air flow speed in unit time is obtained; when the air velocity is greater than or equal to the target value, closing the fresh air function of the air conditioner; and an automatic door at the air outlet of the fan is controlled to be closed, so that cold air and dust on the outdoor side are prevented from flowing backwards into the indoor side through the air outlet. A control module of the air conditioner is connected with an air volume sensor, the air volume sensor can measure the air flowing speed of the outdoor side in unit time in real time and feed back the air flowing speed to the control module, and when the air flowing speed is larger than or equal to a target value, the control module outputs a control instruction to close the fresh air function of the air conditioner. And the automatic door at the air outlet is closed, so that the exhaust pipe cannot be communicated to the outdoor side, cold air and dust are prevented from flowing backwards into the indoor side through the exhaust pipe, the air quality of the indoor side is improved, and the use experience of a user is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of fresh air air conditioners, and in particular to a fresh air air conditioner wind backflow prevention device and a control method. Background Art

[0002] With the improvement of living quality, basic cooling and heating can no longer meet people's pursuit of air conditioning functions. Ordinary air conditioners need to close doors and windows when they are turned on, resulting in poor air circulation and affecting indoor air quality.

[0003] In order to meet the needs of consumers, a new type of fresh air air conditioner has appeared on the market. However, in actual use, many after-sales feedbacks show that when the fresh air function is turned off, it is easy for wind, dust, and lint in the outdoor air to flow back into the room, especially in winter when the wind is particularly strong, and cold air flows back from the air outlet in winter. At the same time, when the outside air volume is too large, when the fresh air function is turned on, the exhaust motor cannot operate, resulting in damage to the motor and other components, which seriously affects the user experience.

[0004] Therefore, a fresh air air conditioning backflow prevention control method is needed that can effectively prevent cold air from backflowing and bringing in dust without affecting the indoor air exchange efficiency. Summary of the invention

[0005] In order to overcome the problems existing in the related art, the purpose of the present invention is to provide a fresh air air conditioner wind backflow prevention device and control method, wherein the fresh air air conditioner wind backflow prevention control method can effectively prevent the cold air from backflowing and bringing in dust without affecting the indoor air exchange efficiency.

[0006] A fresh air air conditioner wind backflow prevention control method, comprising:

[0007] Use the air volume sensor to measure the air velocity outside the room and obtain the air velocity per unit time;

[0008] When the air flow rate is greater than or equal to the target value, turning off the fresh air function of the air conditioner;

[0009] Control the automatic door at the fan outlet to close to prevent cold air and dust from the outdoor side from flowing back into the indoor side through the outlet.

[0010] In a preferred technical solution of the present invention, after the fresh air function of the air conditioner is turned off, the method further includes:

[0011] The control check valve gasket is closed to prevent outdoor cold air and dust from flowing back into the indoor side through the exhaust pipe.

[0012] In a preferred technical solution of the present invention, the target value is related to the power of the stepper motor, and the target value is 10.8 m / s.

[0013] In a preferred technical solution of the present invention, after obtaining the air flow rate per unit time, the method further includes:

[0014] When the air flow rate is less than the target value, the fresh air function of the fan is turned on;

[0015] Control the opening of the automatic door at the fan outlet.

[0016] In a preferred technical solution of the present invention, after turning on the fresh air function of the fan, the method further includes:

[0017] The exhaust motor is controlled to suck up the check valve gasket to connect the exhaust pipe.

[0018] The present invention also provides a device for preventing backflow of fresh air air conditioners, which is applied to any of the above-mentioned methods for preventing backflow of fresh air air conditioners. The device includes a fan, a first end of the fan is connected to a fresh air connector, and a second end of the fan is provided with an air outlet; an automatic door is provided at the air outlet, and an air volume sensor is provided on the automatic door; the air volume sensor is located on the outdoor side, and the air volume sensor is used to measure the air flow rate on the outdoor side.

[0019] In a preferred technical solution of the present invention, the fresh air connector is located in the wall, and the fresh air connector is connected to the air inlet; the air inlet is located on the indoor side, and the fresh air connector is used to exhaust the air on the indoor side.

[0020] In a preferred technical solution of the present invention, it also includes an exhaust duct, the first end of the fan is connected to the first end of the exhaust duct, and the second end of the exhaust duct is connected to the fresh air connector.

[0021] In a preferred technical solution of the present invention, a stepper motor is connected to the side of the automatic door, and the stepper motor is used to drive the automatic door to rotate so as to periodically open and close the air outlet.

[0022] In a preferred technical solution of the present invention, a flange is provided on the inner wall of the exhaust duct, the flange includes a reinforcing rib structure, a positioning hole is provided at the center of the reinforcing rib structure, and the positioning hole is connected to or integrally formed with the exhaust duct.

[0023] In a preferred technical solution of the present invention, a stop valve gasket is provided at the connection between the exhaust pipe and the fresh air connector, and the stop valve gasket is used to block cold air and dust from entering the indoor side; a positioning shaft is provided at the center of the stop valve gasket, and the positioning shaft is adapted to the positioning hole.

[0024] The beneficial effects of the present invention are:

[0025] The present invention provides a device and control method for preventing backflow of fresh air air conditioner, wherein the control method comprises using an air volume sensor to measure the air flow rate of the outdoor side, and obtaining the air flow rate per unit time; when the air flow rate is greater than or equal to a target value, turning off the fresh air function of the air conditioner; and controlling the automatic door at the air outlet of the fan to close, so as to prevent the cold air and dust on the outdoor side from backflowing into the indoor side through the air outlet. The control module of the air conditioner is connected to the air volume sensor, and the air volume sensor can measure the air flow rate of the outdoor side per unit time in real time, and feed back the air flow rate to the control module. When the air flow rate is greater than or equal to the target value, the control module outputs a control instruction, turns off the fresh air function of the air conditioner, and closes the automatic door at the air outlet, so that the exhaust pipe cannot be connected to the outdoor side, and prevents the cold air and dust from backflowing into the indoor side through the exhaust pipe, which not only improves the air quality on the indoor side, but also improves the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 Schematic diagram of the fresh air air conditioner wind backflow prevention device of the present invention;

[0027] Figure 2 is a schematic structural diagram of an air conditioner of the present invention;

[0028] Figure 3 It is a structural schematic diagram of the fan of the present invention;

[0029] Figure 4 is a schematic diagram of a flange of the present invention;

[0030] Figure 5 is a schematic diagram of a stop valve gasket of the present invention;

[0031] Figure 6 is a cross-sectional view of the fresh air connector of the present invention;

[0032] Figure 7 It is a flow chart of the fresh air air conditioning wind backflow prevention control method of the present invention.

[0033] Figure numerals: 1. fan; 2. fresh air connector; 3. air outlet; 4. automatic door; 5. air volume sensor; 6. air inlet; 7. exhaust duct; 8. stepper motor; 9. flange; 10. reinforcing rib structure; 11. positioning hole; 12. stop valve gasket; 13. positioning shaft; 14. air conditioner; 15. control module. DETAILED DESCRIPTION

[0034] The preferred embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the preferred embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.

[0035] Example 1

[0036] like Figure 7 As shown, this embodiment provides a fresh air air conditioning wind backflow prevention control method, including:

[0037] S1: Use the air volume sensor to measure the air flow rate on the outdoor side and obtain the air flow rate per unit time.

[0038] S2: When the air flow rate is greater than or equal to the target value, the fresh air function of the air conditioner is turned off.

[0039] S3: Control the automatic door at the fan outlet to close to prevent cold air and dust from the outdoor side from flowing back into the indoor side through the outlet.

[0040] The air volume sensor 5 is mainly used to measure the air flow velocity on the outdoor side. The air volume sensor 5 is connected to the control module 15 of the air conditioner 14, and feeds back the measured air flow velocity to the control module 15 of the air conditioner 14 in real time. The control module 15 of the air conditioner 14 outputs a control instruction according to the air flow velocity to turn on or off the fresh air function of the air conditioner 14 to achieve more efficient ventilation efficiency and a comfortable indoor environment.

[0041] The air volume sensor 5 can adopt a rotating cup type air volume sensor, which measures the wind speed by the rotation speed of the cup. The advantages are simple structure, low cost, good dynamic characteristics, and suitable for scenes where the external environment wind speed needs to be measured. The air volume sensor 5 can also adopt a wind pressure type air volume sensor, which indirectly calculates the air volume by measuring the wind pressure difference, and is suitable for scenes where the wind pressure change needs to be detected, and is used to monitor the wind pressure change of the air conditioner 14 system to ensure the normal operation of the system.

[0042] The air volume sensor 5 is arranged on the outdoor side, and can measure the air flow velocity on the outdoor side in real time, obtain the air flow velocity flowing through the air outlet 3 per unit time, and feed back the obtained information to the control module 15 of the air conditioner 14. When the air volume sensor 5 measures that the air flow velocity on the outdoor side is greater than or equal to the set target value, the control module 15 of the air conditioner 14 outputs a control instruction according to the air flow velocity fed back by the air volume sensor 5, turns off the fresh air function of the air conditioner 14, and controls the automatic door 4 at the air outlet 3 to close. When the fresh air function of the air conditioner 14 is turned off, the automatic door 4 at the air outlet 3 cannot be opened, which can effectively prevent cold air and dust from flowing back into the indoor side.

[0043] When the air conditioner 14 turns off the fresh air function, since the fan 1 stops and no negative pressure is generated to extract the air inside the room, no air flows out of the exhaust pipe 7. The exhaust pipe 7 itself connects the indoor side and the outdoor side. If the wind blows outside at this time, impurities such as dust and lint will flow into the exhaust pipe 7 and be adsorbed on the sponge of the fresh air connector 2, causing blockage. By setting an automatic door 4 at the air outlet 3, when the fresh air function of the air conditioner 14 is turned off, the automatic door 4 of the air outlet 3 is controlled to close, which can prevent the cold air, dust, lint and other impurities outside from flowing back into the exhaust pipe 7 through the air outlet 3 and then entering the indoor side through the exhaust pipe 7.

[0044] A fresh air air conditioner wind backflow control method of this embodiment includes using an air volume sensor 5 to measure the air flow rate on the outdoor side to obtain the air flow rate per unit time; when the air flow rate is greater than or equal to the target value, turning off the fresh air function of the air conditioner 14; controlling the automatic door 4 at the air outlet 3 of the fan 1 to close, so as to prevent the cold air and dust on the outdoor side from backflowing into the indoor side through the air outlet 3. The control module 15 of the air conditioner 14 is connected to the air volume sensor 5, and the air volume sensor 5 can measure the air flow rate per unit time on the outdoor side in real time, and feed back the air flow rate to the control module 15. When the air flow rate is greater than or equal to the target value, the control module 15 outputs a control instruction to turn off the fresh air function of the air conditioner 14, and close the automatic door 4 at the air outlet 3, so that the exhaust pipe 7 cannot be connected to the outdoor side, and prevent the cold air and dust from backflowing into the indoor side through the exhaust pipe 7, which not only improves the air quality on the indoor side, but also improves the user experience.

[0045] Example 2

[0046] like Figure 7 As shown, this embodiment provides a fresh air air conditioning wind backflow prevention control method, including:

[0047] S1: Use the air volume sensor to measure the air flow rate on the outdoor side and obtain the air flow rate per unit time.

[0048] S2: When the air flow rate is greater than or equal to the target value, the fresh air function of the air conditioner is turned off.

[0049] S3: Control the automatic door at the fan outlet to close to prevent cold air and dust from the outdoor side from flowing back into the indoor side through the outlet.

[0050] After the fresh air function of the air conditioner is turned off, the method further includes:

[0051] The control check valve gasket is closed to prevent outdoor cold air and dust from flowing back into the indoor side through the exhaust pipe.

[0052] The target value is related to the power of the stepper motor, and the target value is 10.8 m / s.

[0053] After obtaining the air flow rate per unit time, the method further includes:

[0054] S2': When the air flow rate is less than the target value, the fresh air function of the fan is turned on.

[0055] S3': Control the automatic door at the fan outlet to open.

[0056] After the fresh air function of the fan is turned on, the method further includes:

[0057] The exhaust motor is controlled to suck up the check valve gasket to connect the exhaust pipe.

[0058] The air flow speed can be divided into level 1 wind (0.3-1.5m / s), level 2 wind (1.6-3.3m / s), level 3 wind (3.4-5.4m / s), level 4 wind (5.5-7.9m / s) and level 5 wind (8.0-10.7m / s) according to the wind force level. When the air volume sensor 5 measures that the air flow speed on the outdoor side is greater than or equal to the set target value, that is, the air flow speed is greater than or equal to 10.8m / s, the control module 15 of the air conditioner 14 turns off the fresh air function. When the air volume sensor 5 measures that the air flow speed on the outdoor side is less than the set target value, that is, the air flow speed is less than 10.8m / s, the control module 15 of the air conditioner 14 turns on the fresh air function to discharge the air on the indoor side to the outdoor side.

[0059] The target value of the air flow velocity is 10.8 m / s, and the target value is related to the power of the stepper motor 8. When the measured air flow velocity on the outdoor side is greater than the working range of the power capacity of the stepper motor 8, the control module 15 of the air conditioner 14 outputs a control instruction to turn off the fresh air function.

[0060] When the fresh air function of the air conditioner 14 is turned off, the automatic door 4 at the air outlet 3 of the fan 1 is controlled to be closed, so that the cold air and dust on the outdoor side cannot flow back into the exhaust pipe 7 through the air outlet 3. After the fresh air function is turned off, the stop valve gasket 12 is controlled to be closed, and the stop valve gasket 12 isolates the exhaust pipe 7 from the indoor side. Even if the cold air and dust on the outdoor side enter the exhaust pipe 7, they cannot enter the indoor side through the exhaust pipe 7. When the stop valve gasket 12 is closed, it plays a secondary role in preventing the cold air and dust from entering the indoor side.

[0061] When the fresh air function of the air conditioner 14 is turned on, the automatic door 4 at the air outlet 3 of the fan 1 is controlled to open, and the fan 1 starts to work. When the fan 1 is running, negative pressure is generated to extract the air inside the room, and the air inside the room is discharged to the outside through the exhaust pipe 7. After the fresh air function of the air conditioner 14 is turned on, the exhaust motor is controlled to suck up the stop valve gasket 12. After the stop valve gasket 12 is sucked up, the indoor side is connected with the exhaust pipe 7, and the air inside the room is sucked into the exhaust pipe 7, and then discharged to the outside through the exhaust pipe 7, thereby improving the air quality inside the room.

[0062] A method for controlling the backflow of fresh air air conditioner in this embodiment includes: using the air volume sensor 5 to measure the air flow rate on the outdoor side to obtain the air flow rate per unit time; when the air flow rate is greater than or equal to the target value, turning off the fresh air function of the air conditioner 14; controlling the automatic door 4 at the air outlet 3 of the fan 1 to close, so as to prevent the cold air and dust on the outdoor side from flowing back into the indoor side through the air outlet 3. After the control of turning off the fresh air function of the air conditioner 14, it also includes: controlling the stop valve gasket 12 to close, so as to prevent the cold air and dust on the outdoor side from flowing back into the indoor side through the exhaust pipe 7 again. The value of the target value is related to the power of the stepper motor 8, and the target value is 10.8m / s. After obtaining the air flow rate per unit time, it also includes: when the air flow rate is less than the target value, turning on the fresh air function of the fan 1; controlling the automatic door 4 at the air outlet 3 of the fan 1 to open. After turning on the fresh air function of the fan 1, it also includes: controlling the exhaust motor to suck up the stop valve gasket 12 to connect the exhaust pipe 7. When the fresh air function of the air conditioner 14 is turned off, the automatic door 4 at the air outlet 3 of the fan 1 is controlled to be closed and the check valve gasket 12 is closed, so that the exhaust pipe 7 cannot connect the outdoor side and the indoor side, so as to prevent the cold air and dust on the outdoor side from flowing back into the indoor side through the exhaust pipe 7, thereby improving the air quality on the indoor side. When the fresh air function of the air conditioner 14 is turned on, the automatic door 4 at the air outlet 3 of the fan 1 is controlled to be opened, and the exhaust motor is controlled to suck the check valve gasket 12, so that the exhaust pipe 7 connects the outdoor side and the indoor side, so as to extract the air on the indoor side to the outdoor side, thereby ventilating the air on the indoor side.

[0063] Example 3

[0064] like Figure 1-Figure 6 As shown, this embodiment provides a device for preventing backflow of fresh air air conditioner, which is applied to the control method for preventing backflow of fresh air air conditioner in Example 1 or Example 2, and the device includes a fan 1, a first end of the fan 1 is connected to a fresh air connector 2, and an air outlet 3 is provided at the second end of the fan 1; an automatic door 4 is provided at the air outlet 3, and an air volume sensor 5 is provided on the automatic door 4; the air volume sensor 5 is located on the outdoor side, and the air volume sensor 5 is used to measure the air flow rate on the outdoor side.

[0065] The fresh air connector 2 is located in the wall, and the fresh air connector 2 is connected to the air inlet 6; the air inlet 6 is located on the indoor side, and the fresh air connector 2 is used to exhaust the air on the indoor side.

[0066] The fresh air air conditioning wind backflow prevention device also includes an exhaust pipe 7, the first end of the fan 1 is connected to the first end of the exhaust pipe 7, and the second end of the exhaust pipe 7 is connected to the fresh air connector 2.

[0067] A stepper motor 8 is connected to the side of the automatic door 4 , and the stepper motor 8 is used to drive the automatic door 4 to rotate so as to periodically open and close the air outlet 3 .

[0068] The fresh air connector 2 is installed on the indoor side and embedded in the wall. The exhaust pipe 7 extends from the wall to the outer wall. The two ends of the exhaust pipe 7 are connected to the fresh air connector 2 and the fan 1 installed on the outdoor side. The exhaust pipe 7 is used to transport the turbid air on the indoor side to the outdoor side. The air volume sensor 5 is installed at the air outlet 3 of the fan 1 and is electrically connected to the control module 15. The air volume sensor 5 is used to detect the air flow rate at the air outlet 3 of the fan 1, that is, the wind speed per unit time, and then control the opening and closing of the automatic door 4 according to the air flow rate.

[0069] The indoor unit of the air conditioner 14 is provided with a control module 15 , a weak wire is provided at the fresh air connector 2 , the weak point wire is connected to the indoor unit of the air conditioner 14 , the fan 1 is connected to the fresh air connector 2 , and the fan 1 transmits signals to the control module 15 via the weak wire.

[0070] The exhaust duct 7 is L-shaped and includes a straight section and a bent section. The straight section is located in the cavity, and the bent section is located outside the room. The straight section is connected to the bent section. When the fan 1 is running, a negative pressure is generated in the exhaust duct 7, so that the pressure in the exhaust duct 7 is lower than the pressure inside the room, so that the air inside the room flows into the exhaust duct 7 through the fresh air connector 2.

[0071] The automatic door 4 is provided with an air outlet 3, and a baffle is provided near the air outlet 3. The baffle is arc-shaped, and forms a certain angle with the air outlet 3 during the rotation process. When the baffle is in a vertical state, the air outlet 3 is closed, and the air in the exhaust pipe 7 cannot be discharged through the air outlet 3.

[0072] When the air volume sensor 5 detects that the air flow rate on the outdoor side is greater than or equal to the target value, the excessive air volume may easily cause the exhaust motor to overload, resulting in abnormalities such as overcurrent and stall, causing the exhaust motor to malfunction. If the air outlet 3 is in a closed state, the stepper motor 8 does not work, so that the automatic door 4 remains in a vertical state. If the air outlet 3 is in a fully open or partially open state, the stepper motor 8 rotates to drive the automatic door 4 to close. When the automatic door 4 is in a fully open state, the extension direction of the automatic door 4 is perpendicular to the extension direction of the air outlet 3, that is, the automatic door 4 extends in the horizontal direction and the air outlet 3 extends in the height direction. When the automatic door 4 is in a partially open state, a certain angle is formed between the automatic door 4 and the air outlet 3, and the automatic door 4 is tilted at this time.

[0073] When the air volume sensor 5 detects that the air flow rate on the outdoor side is less than the target value, if the air outlet 3 is in a closed state, the stepper motor 8 drives the automatic door 4 to rotate to open the air outlet 3. If the air outlet 3 is in an open state, the control module 15 rotates the automatic door 4 according to the air flow rate on the outdoor side, and the angle between the automatic door 4 and the air outlet 3 ranges from 0 to 90 degrees. The angle is negatively correlated with the air flow rate on the outdoor side, that is, the smaller the air flow rate on the outdoor side, the larger the angle between the automatic door 4 and the air outlet 3. Preferably, the angle is nonlinearly related to the air flow rate on the outdoor side, and the following formula is used to describe the relationship between the angle and the air flow rate on the outdoor side:

[0074]

[0075] Among them, θ v is the angle between the automatic door 4 and the air outlet 3, θ0 is the initial angle, θ1 is the adjustment angle, a is the adjustment parameter, and v 外 is the air velocity on the outdoor side, v0 is the target value. In this embodiment, v0 is set to 10.8 m / s, θ0 and θ1 are both 15 degrees, and a is 0.5.

[0076] A fresh air air conditioner wind backflow prevention device of this embodiment is applied to the fresh air air conditioner wind backflow prevention control method in embodiment 1 or embodiment 2, the device comprises a fan 1, the first end of the fan 1 is connected to the fresh air joint 2, and the second end of the fan 1 is provided with an air outlet 3; the air outlet 3 is provided with an automatic door 4, and the automatic door 4 is provided with an air volume sensor 5; the air volume sensor 5 is located on the outdoor side, and the air volume sensor 5 is used to measure the air flow rate on the outdoor side. The fresh air joint 2 is located in the wall, and the fresh air joint 2 is connected with the air inlet 6; the air inlet 6 is located on the indoor side, and the fresh air joint 2 is used to discharge the air on the indoor side. The exhaust pipe 7 is L-shaped, and the exhaust pipe 7 includes a straight section and a bending section, the straight section is located in the cavity, the bending section is located on the outdoor side, and the straight section is connected with the bending section. When the fan 1 is running, a negative pressure is generated in the exhaust pipe 7, so that the pressure in the exhaust pipe 7 is less than the pressure on the indoor side, so that the air on the indoor side flows into the exhaust pipe 7 through the fresh air joint 2. The automatic door 4 is provided with an air outlet 3, and a baffle is provided near the air outlet 3. The baffle is arc-shaped, and forms a certain angle with the air outlet 3 during the rotation process. When the baffle is in a vertical state, the air outlet 3 is closed, and the air in the exhaust pipe 7 cannot be discharged through the air outlet 3. When the air flow rate on the outdoor side is greater than or equal to the target value, the stepper motor 8 drives the automatic door 4 to close; when the air flow rate on the outdoor side is less than the target value, the stepper motor 8 drives the automatic door 4 to open.

[0077] Example 4

[0078] like Figure 1-Figure 6 As shown, this embodiment provides a device for preventing backflow of fresh air air conditioner, which is applied to the control method for preventing backflow of fresh air air conditioner described in Example 1 or Example 2, and the device includes a fan 1, a first end of the fan 1 is connected to a fresh air connector 2, and an air outlet 3 is provided at the second end of the fan 1; an automatic door 4 is provided at the air outlet 3, and an air volume sensor 5 is provided on the automatic door 4; the air volume sensor 5 is located on the outdoor side, and the air volume sensor 5 is used to measure the air flow rate on the outdoor side.

[0079] The inner wall of the exhaust pipe 7 is provided with a flange 9 , and the flange 9 includes a reinforcing rib structure 10 . A positioning hole 11 is provided at the center of the reinforcing rib structure 10 . The positioning hole 11 is connected to or integrally formed with the exhaust pipe 7 .

[0080] A stop valve gasket 12 is provided at the connection between the exhaust pipe 7 and the fresh air connector 2, and the stop valve gasket 12 is used to block cold air and dust from entering the indoor side; a positioning shaft 13 is provided at the center of the stop valve gasket 12, and the positioning shaft 13 is adapted to the positioning hole 11.

[0081] The flange 9 is arranged on the inner wall of the exhaust pipe 7, and is used to fix the reinforcing rib structure 10 and also plays the role of dispersing stress. The shape of the flange 9 can be designed according to the internal structure and stress conditions of the exhaust pipe 7, and is generally an annular structure or a local raised structure, and its height and width need to be optimized according to actual needs and material properties. The flange 9 can be integrally formed with the exhaust pipe 7, which can improve the strength and sealing of the overall structure.

[0082] The function of the reinforcing rib structure 10 is to improve the rigidity and strength of the exhaust pipe 7, while dispersing stress and preventing structural deformation. The reinforcing rib structure 10 is arranged in the middle position of the flange 9, and the reinforcing rib structure 10 can be connected by welding, bolting or integrally formed with the exhaust pipe 7. The integrally formed design can reduce the use of connectors and improve the rigidity and strength of the overall structure. The cross-sectional shape of the reinforcing rib structure 10 can be a rectangular, circular or variable cross-sectional design. Here, the shape of the reinforcing rib structure 10 is preferably a cross reinforcing rib structure 10, and the cross-sectional shape of the reinforcing rib structure 10 is preferably a circular cross-sectional shape, and the circular cross-sectional shape has better bending resistance.

[0083] The positioning hole 11 is set at the center of the reinforcing rib structure 10, and is used for accurate positioning when installing the stop valve gasket 12. The size of the positioning hole 11 is designed according to the installation requirements and the specifications of the connector, and can be circular or square. Here, the shape of the positioning hole 11 is preferably circular. The positioning hole 11 can be integrally formed with the exhaust pipe 7 or the reinforcing rib, or can be machined before installation.

[0084] The stop valve gasket 12 is made of nitrile rubber, and a positioning shaft 13 is provided at the center of the stop valve gasket 12. The positioning shaft 13 is adapted to the positioning hole 11, and the end of the positioning shaft 13 is conical, which is convenient for installation on the positioning hole 11. The positioning shaft 13 itself has good elasticity and can be fixed into the positioning hole 11 by extrusion. When the positioning shaft 13 of the stop valve gasket 12 is inserted into the positioning hole 11 of the flange 9, the stop valve gasket 12 is fixed on the flange 9 to prevent the cold air and dust in the exhaust pipe 7 from entering the indoor side.

[0085] A fresh air air conditioner wind backflow prevention device of this embodiment is applied to the fresh air air conditioner wind backflow prevention control method described in Example 1 or Example 2, the device includes a fan 1, the first end of the fan 1 is connected to the fresh air connector 2, and the second end of the fan 1 is provided with an air outlet 3; the air outlet 3 is provided with an automatic door 4, and the automatic door 4 is provided with an air volume sensor 5; the air volume sensor 5 is located on the outdoor side, and the air volume sensor 5 is used to measure the air flow rate on the outdoor side. The inner wall of the exhaust pipe 7 is provided with a flange 9, and the flange 9 includes a reinforcing rib structure 10, and a positioning hole 11 is provided at the center of the reinforcing rib structure 10, and the positioning hole 11 is connected to the exhaust pipe 7 or integrally formed. A stop valve gasket 12 is provided at the connection between the exhaust pipe 7 and the fresh air connector 2, and the stop valve gasket 12 is used to prevent cold air and dust from entering the indoor side; a positioning shaft 13 is provided at the center of the stop valve gasket 12, and the positioning shaft 13 is adapted to the positioning hole 11. The inner wall of the exhaust pipe 7 is provided with a flange 9, and the flange 9 includes a reinforcing rib structure 10. The positioning hole 11 at the center of the reinforcing rib structure 10 is adapted to the positioning shaft 13 of the stop valve gasket 12. When the fresh air function of the air conditioner 14 is turned on, the exhaust motor sucks up the stop valve gasket 12, so that the positioning shaft 13 of the stop valve gasket 12 is separated from the positioning hole 11 of the flange 9, so that the exhaust pipe 7 is connected with the indoor side, and the dirty air on the indoor side is discharged to the outdoor side through the exhaust pipe 7. When the fresh air function of the air conditioner 14 is turned off, the positioning shaft 13 of the stop valve gasket 12 is inserted into the positioning hole 11 of the flange 9, so that the exhaust pipe 7 is no longer connected with the indoor side, so as to prevent cold wind and dust from entering the exhaust pipe 7 from the air outlet 3, and then entering the indoor side through the exhaust pipe 7, thereby improving the air quality on the indoor side.

[0086] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the application. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a restriction. Therefore, other examples of exemplary embodiments can have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in the subsequent accompanying drawings.

[0087] It should be understood that spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is inverted, a device described as "above" or "above" other devices or structures would then be positioned "below" or "below" the other devices or structures. Thus, the exemplary term "above" can include both the orientations of "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used herein should be interpreted accordingly.

[0088] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0089] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for preventing wind backflow in a fresh air air conditioner, characterized in that: include: Use the air volume sensor to measure the air velocity outside the room and obtain the air velocity per unit time; When the air flow rate is greater than or equal to the target value, turning off the fresh air function of the air conditioner; Control the automatic door at the fan outlet to close to prevent cold air and dust from the outdoor side from flowing back into the indoor side through the outlet.

2. The fresh air air conditioning wind backflow prevention control method according to claim 1 is characterized in that: After the fresh air function of the air conditioner is turned off, the method further includes: The control check valve gasket is closed to prevent outdoor cold air and dust from flowing back into the indoor side through the exhaust pipe.

3. The fresh air air conditioning wind backflow prevention control method according to claim 1 is characterized in that: The target value is related to the power of the stepper motor, and the target value is 10.8 m / s.

4. The fresh air air conditioning wind backflow prevention control method according to claim 1 is characterized in that: After obtaining the air flow rate per unit time, the method further includes: When the air flow rate is less than the target value, the fresh air function of the fan is turned on; Control the opening of the automatic door at the fan outlet.

5. The fresh air air conditioning wind backflow prevention control method according to claim 4 is characterized in that: After the fresh air function of the fan is turned on, the method further includes: The exhaust motor is controlled to suck up the check valve gasket to connect the exhaust pipe.

6. A device for preventing wind backflow of fresh air air conditioner, characterized in that: The method for preventing backflow of fresh air air conditioners applied to any one of claims 1-5, wherein the device comprises a fan, a first end of the fan is connected to a fresh air connector, and a second end of the fan is provided with an air outlet; an automatic door is provided at the air outlet, and an air volume sensor is provided on the automatic door; the air volume sensor is located on the outdoor side, and the air volume sensor is used to measure the air flow rate on the outdoor side.

7. The fresh air air conditioning wind backflow prevention device according to claim 6 is characterized in that: The fresh air connector is located in the wall, and is connected to the air inlet; the air inlet is located on the indoor side, and the fresh air connector is used to discharge the air on the indoor side.

8. The fresh air air conditioning wind backflow prevention device according to claim 6, characterized in that: It also includes an exhaust pipe, the first end of the fan is connected to the first end of the exhaust pipe, and the second end of the exhaust pipe is connected to the fresh air connector.

9. The fresh air air conditioning wind backflow prevention device according to claim 6, characterized in that: A stepper motor is connected to the side of the automatic door, and the stepper motor is used to drive the automatic door to rotate so as to periodically open and close the air outlet.

10. The fresh air air conditioning wind backflow prevention device according to claim 8, characterized in that: The inner wall of the exhaust pipe is provided with a flange, the flange includes a reinforcing rib structure, a positioning hole is provided at the center of the reinforcing rib structure, and the positioning hole is connected to or integrally formed with the exhaust pipe.

11. The fresh air air conditioning wind backflow prevention device according to claim 10, characterized in that: A stop valve gasket is provided at the connection between the exhaust pipe and the fresh air connector, and the stop valve gasket is used to block cold air and dust from entering the indoor side; a positioning shaft is provided at the center of the stop valve gasket, and the positioning shaft is adapted to the positioning hole.

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