Fresh air duct outer end port backflushing anti-blocking device

Abstract

The application relates to the technical field of fresh air systems, in particular to a backflushing anti-blocking device for an outer port of a fresh air pipeline, which comprises a first interface, a second interface is arranged between a purifier and an air inlet fan, a third interface and a fourth interface are sequentially arranged at the front end of the air inlet fan, a first pipeline is arranged between the first interface and the third interface, the first pipeline is provided with a second switch valve, a first switch valve is arranged between the air inlet pipeline and the purifier, a second pipeline is connected between the second interface and the fourth interface, a magnetic switch valve is arranged in the second pipeline, and the magnetic switch valve is opened when the air flow thrust is greater than the maximum threshold value of the magnetic switch valve. The device repeatedly impacts the air inlet pipeline through repeated pulse air flow, blows off the blockage of the air inlet pipeline port, and has better impurity removal effect.

Description

Technical Field

[0001] This invention relates to the field of fresh air system technology, and in particular to a backflow prevention and anti-clogging device for the external port of a fresh air duct. Background Technology

[0002] A ducted fresh air system includes components such as a fresh air unit and duct fittings, and is equipped with a corresponding control system to realize a smart home fresh air system. It purifies outdoor air by introducing it into the room through the fresh air unit and exhausts indoor air through the ducts. Since one end of the fresh air system duct is located outdoors, and this outdoor end is mainly responsible for introducing outside air into the room, it is often blocked by debris such as poplar and willow catkins, which affects the air intake of the fresh air system, not only affecting the service life of the fresh air system, but also reducing its effectiveness.

[0003] The applicant previously disclosed a fresh air backflushing system (publication number: CN110410919A) to solve the above problems. It mainly uses multiple switching valves and the cooperation of the switching valves and return air fans to achieve the backflushing effect on the outer port of the air inlet duct. This method has the following defects: since the return air fans of general fresh air systems have relatively small power, the thrust generated is small and can only be a continuous small airflow thrust, so the backflushing effect on debris is not obvious. Summary of the Invention

[0004] The purpose of this invention is to solve the problems pointed out in the background art, and to propose a backflow prevention and anti-blockage device for the external port of a fresh air duct.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A backflow prevention and anti-clogging device for the external port of a fresh air duct includes a return air duct and an intake air duct connecting indoors and outdoors. A return air fan is installed at the indoor end of the return air duct, and an intake air fan and an air purifier are installed from the outside to the inside at the indoor end of the intake air duct. The side of the duct closer to the outside is defined as the front end. A first interface is provided at the front end of the return air fan in the return air duct. A second interface is provided between the air purifier and the intake air fan in the intake air duct. A third interface and a fourth interface are sequentially provided at the front end of the intake air fan in the intake air duct. A first pipe is provided between the first interface and the third interface, and the first pipe is equipped with a second switching valve. A first switching valve is provided between the second interface and the air purifier in the intake air duct. A second pipe is connected between the second interface and the fourth interface. A magnetic switching valve is provided in the second pipe. The magnetic switching valve opens when the airflow thrust is greater than the maximum threshold of the magnetic switching valve.

[0007] The magnetic switch valve includes a connecting pipe connected to a second pipeline. A second magnetic plate is fixedly connected inside the connecting pipe. The second magnetic plate has a first opening. A first magnetic plate is movably installed above the second magnetic plate inside the connecting pipe. The first magnetic plate has a second opening that is offset from the first opening. The second magnetic plate and the first magnetic plate are magnetically attracted to each other.

[0008] The second pipeline is located between the magnetic switch valve and the second interface and is equipped with an expandable rubber tube. The minimum expansion pressure of the expandable rubber tube is less than the maximum threshold of the magnetic switch valve.

[0009] The air inlet duct is located between the fourth interface and the air inlet fan, and a third switch valve is installed thereon.

[0010] The present invention proposes a backflow prevention and anti-clogging device for the external port of a fresh air duct. The beneficial effects are as follows: When the air inlet of the air inlet duct needs to be cleaned, the second switch valve is opened and the first switch valve is closed. The air inlet fan draws airflow from the return air duct through the first duct and simultaneously draws airflow from the air inlet duct. The drawn airflow enters the second duct. Since the second duct is equipped with a magnetic switch valve, the airflow accumulates pressure in the second duct. When the air pressure is greater than the maximum threshold of the magnetic switch valve, the magnetic switch valve opens, and the pressurized airflow rushes towards the air inlet duct, creating a positive pressure impact on the air inlet duct. After the magnetic switch valve depressurizes, it closes again to accumulate pressure again. The repeated pulsed airflow repeatedly impacts the air inlet duct, blowing off the blockage at the air inlet duct port. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the airflow structure of the fresh air system under normal operation according to the first embodiment of the present invention;

[0012] Figure 2 This is a schematic diagram of the structure of the fresh air system in the backflush state according to the first embodiment of the present invention;

[0013] Figure 3 This is a schematic diagram of the backflow state structure of the fresh air system after the energy storage is completed according to the first embodiment of the present invention;

[0014] Figure 4 This is a schematic diagram of the normal operating airflow of the fresh air system according to the second embodiment of the present invention;

[0015] Figure 5 This is a schematic diagram of the structure of the fresh air system in the backflush state according to the second embodiment of the present invention;

[0016] Figure 6 This is a schematic diagram of the backflow state structure of the fresh air system after the energy storage is completed according to the second embodiment of the present invention;

[0017] Figure 7This is a schematic diagram of the magnetic switch valve structure of the present invention.

[0018] In the diagram: 1. Return air duct; 2. First interface; 3. Return air fan; 4. Purifier; 5. First switch valve; 6. Second interface; 7. First duct; 8. Second switch valve; 9. Third interface; 10. Fourth interface; 11. Inlet air duct; 12. Magnetic switch valve; 13. Second duct; 14. Expandable rubber hose; 15. Inlet air fan; 16. Third switch valve; 17. Connecting pipe; 18. First magnetic plate; 19. First opening; 20. Second magnetic plate; 21. Second opening. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0020] Reference Figure 1-7 A backflow prevention and anti-blocking device for the external port of a fresh air duct includes a return air duct 1 connecting indoors and outdoors, and an intake air duct 11. A return air fan 3 is installed at the indoor end of the return air duct 1, and an intake air fan 15 and an air purifier 4 are installed from the outside to the inside at the indoor end of the intake air duct 11. The side of the duct closer to the outside is defined as the front end. A first interface 2 is provided at the front end of the return air fan 3 in the return air duct 1. A second interface 6 is provided between the air purifier 4 and the intake air fan 15 in the intake air duct 11. A third interface 9 and a fourth interface 10 are provided sequentially at the front end of the intake air fan 15 in the intake air duct 11. A first pipe 7 is provided between the first interface 2 and the third interface 9, and a second switch valve 8 is provided in the first pipe 7. A first switch valve 5 is provided between the second interface 6 and the air purifier 4 in the intake air duct 11. A second pipe 13 is connected between the second interface 6 and the fourth interface 10. A magnetic switch valve 12 is provided in the second pipe 13. The magnetic switch valve 12 opens when the airflow thrust is greater than the maximum threshold of the magnetic switch valve 12.

[0021] refer to Figure 1 When the fresh air system circulates air, the second switch valve 8 is closed and the first switch valve 5 is opened. The intake fan 15 draws in outside air, which is then introduced into the room through the purifier 4. The return fan 3 draws in indoor air and discharges it to the outside.

[0022] refer to Figure 2 When cleaning the air inlet of the air inlet duct is required, open the second switch valve 8 and close the first switch valve 5. The air inlet fan 15 draws airflow from the return air duct 1 through the first pipe 7 and simultaneously draws airflow from the air inlet duct 11. The drawn airflow enters the second pipe 13. Since the second pipe 13 is equipped with a magnetic switch valve 12, the airflow accumulates power within the second pipe 13. (Refer to...) Figure 3When the air pressure is greater than the maximum threshold of the magnetic switch valve 12, the magnetic switch valve 12 opens, and the pressurized airflow rushes towards the air inlet pipe 11, causing the air inlet pipe 11 to form a positive pressure impact. After the magnetic switch valve 12 depressurizes, it closes again to recharge. The repeated pulsed airflow repeatedly impacts the air inlet pipe 11, blowing off the blockage at the port of the air inlet pipe 11.

[0023] As one embodiment of the magnetic switching valve 12, see reference Figure 7 The magnetic switch valve 12 includes a connecting pipe 17 connected to the second pipe 13. A second magnetic plate 20 is fixedly connected inside the connecting pipe 17. The second magnetic plate 20 has a first opening 19. A first magnetic plate 18 is movably installed above the second magnetic plate 20 inside the connecting pipe 17. The first magnetic plate 18 has a second opening 21 that is offset from the first opening 19. The second magnetic plate 20 and the first magnetic plate 18 are magnetically attracted. When the air pressure inside the second pipe 13 exceeds the attraction between the magnetic plates, the first opening 19 and the second opening 21 are connected, allowing the airflow in the second pipe 13 to rush into the air inlet pipe 11. When the pressure in the second pipe 13 decreases, the first opening 19 and the second opening 21 are repositioned and closed. Preferably, the first opening 19 and the second opening 21 are larger than the diameter of the second pipe 13 and the air inlet pipe 11. This is beneficial for quickly releasing the airflow inside the second pipe 13, achieving a better instantaneous pressure relief effect, a better airflow impact effect, and also serving as a valve body, reducing the use of control valves.

[0024] refer to Figure 3 In order to improve the power storage effect, an expandable rubber tube 14 is installed in the second pipe 13 between the magnetic switch valve 12 and the second interface 6. The minimum expansion pressure of the expandable rubber tube 14 is less than the maximum threshold of the magnetic switch valve 12. During the power storage process, the expandable rubber tube 14 expands to store a part of the airflow. When it is released, the expandable rubber tube 14 shrinks to improve the pressure relief effect.

[0025] refer to Figures 4-6 The air inlet duct 11 is located between the fourth interface 10 and the air inlet fan 15 and a third switch valve 16 is installed.

[0026] refer to Figure 4 When the fresh air system circulates air, the second switch valve 8 is closed, the first switch valve 5 and the third switch valve 16 are opened, the intake fan 15 draws in outside air, passes through the purifier 4 and enters the room, and the return fan 3 draws in indoor air and discharges it to the outside.

[0027] refer to Figure 5When the air inlet of the air inlet duct needs to be cleaned, open the second switch valve 8 and close the first switch valve 5 and the third switch valve 16. The air inlet fan 15 draws air from the return air duct 1 through the first pipe 7. The drawn air enters the second pipe 13. Since the second pipe 13 is equipped with a magnetic switch valve 12, the airflow accumulates power within the second pipe 13. (Refer to...) Figure 6 When the air pressure exceeds the maximum threshold of the magnetic switch valve 12, the magnetic switch valve 12 opens, and the pressurized airflow rushes towards the air inlet duct 11, creating a positive pressure impact on the air inlet duct 11. After the magnetic switch valve 12 releases pressure, it closes again to recharge. The repeated pulsed airflow repeatedly impacts the air inlet duct 11, blowing off the blockages at the port of the air inlet duct 11. The third switch valve 16 can prevent the airflow from the second duct 13 from dispersing, so that all the pulsed airflow from the second duct 13 rushes towards the air inlet duct 11, achieving a better cleaning effect.

[0028] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technical solution, concept, or design obtained by those skilled in the art by making equivalent substitutions or changes to the technical solution and inventive concept of the present invention within the scope of the technology disclosed in the present invention should be covered within the scope of protection of the present invention.

Claims

1. A backflow prevention and anti-blocking device for the outer port of a fresh air duct, comprising a return air duct (1) connecting indoors and outdoors and an air inlet duct (11), wherein a return air fan (3) is installed at the indoor end of the return air duct (1), and an air inlet fan (15) and an air purifier (4) are installed from the outside to the inside at the indoor end of the air inlet duct (11), characterized in that, The side of the duct closest to the outside is defined as the front end. The return air duct (1) is provided with a first interface (2) at the front end of the return air fan (3). The air inlet duct (11) is provided with a second interface (6) between the purifier (4) and the air inlet fan (15). The air inlet duct (11) is provided with a third interface (9) and a fourth interface (10) in sequence at the front end of the air inlet fan (15). A first pipe (7) is provided between the first interface (2) and the third interface (9), and a second switch valve (8) is provided in the first pipe (7). A first switch valve (5) is provided between the second interface (6) and the purifier (4) of the air inlet duct (11). A second pipe (13) is connected between the second interface (6) and the fourth interface (10). A magnetic switch valve (12) is provided in the second pipe (13). When the airflow thrust is greater than the maximum threshold of the magnetic switch valve (12), the magnetic switch valve (12) opens. The magnetic switch valve (12) includes a connecting pipe (17) connected to a second pipe (13). A second magnetic plate (20) is fixedly connected inside the connecting pipe (17). The second magnetic plate (20) has a first opening (19). A first magnetic plate (18) is movably installed above the second magnetic plate (20) inside the connecting pipe (17). The first magnetic plate (18) has a second opening (21) that is misaligned with the first opening (19). The second magnetic plate (20) and the first magnetic plate (18) are magnetically attracted. The second pipe (13) is located between the magnetic switch valve (12) and the second interface (6) and is equipped with an expandable rubber tube (14). The minimum expansion pressure of the expandable rubber tube (14) is less than the maximum threshold of the magnetic switch valve (12).

2. The backflow prevention and anti-blocking device for the external port of a fresh air duct according to claim 1, characterized in that, The air inlet duct (11) is located between the fourth interface (10) and the air inlet fan (15) and a third switch valve (16) is installed.

Images