Novel anti-backflow exhaust fan

Abstract

The novel anti-backflow exhaust fan comprises an exhaust pipeline, an anti-backflow frame is fixedly installed on the left side of the exhaust pipeline, a sliding groove is formed in the position, close to the left side of the inner wall of the exhaust pipeline, of the exhaust pipeline, the inner wall of the sliding groove is connected with a first filter screen plate in a sliding mode, and the surface of the first filter screen plate is connected with a clamping assembly. A dust collecting box is fixedly connected to the left side of the first filter screen plate, a second filter screen plate is fixedly installed on the right side, close to the inner wall of the exhaust pipeline, of the exhaust pipeline, a first fan is fixedly installed on the right side of the inner wall of the exhaust pipeline, and a ventilation pipe is fixedly connected to the bottom of the exhaust pipeline. Through the cooperation of the structures, an L-shaped exhaust route is planned in the exhaust fan device, the anti-backflow frame is additionally arranged to carry out gear anti-backflow treatment when airflow flows backwards, chippings on the filter screen plate are knocked off and collected through the striking structure which is driven and controlled, and the practical performance of the exhaust fan is indirectly enhanced.

Description

Technical Field

[0001] The utility model relates to the technical field of exhaust fans, in particular to a novel anti-backflow exhaust fan. Background Art

[0002] As a ventilation device for exchanging air between indoor and outdoor, exhaust fans are widely used in bathrooms, toilets, kitchens, offices and many other places to remove indoor dirty air and achieve the effect of regulating the air quality and air temperature and humidity in the environment.

[0003] Since most of the current exhaust fan devices between indoor and outdoor areas do not have an anti-backflow function, backflow may occur if the outdoor airflow is strong, or if the internal structure of the exhaust fan fails, backflow may occur, which indirectly reduces the practicality of the exhaust fan and brings certain adverse effects to actual use, so it needs to be improved. Utility Model Content

[0004] The purpose of the utility model is to provide a new type of exhaust fan with backflow prevention, which has the advantages of planning an L-shaped exhaust route inside the exhaust fan device and adding an anti-backflow frame to perform backflow prevention processing when the airflow backflows, and knocks off and collects the debris on the filter plate through a drive-controlled striking structure, thereby indirectly enhancing the practical performance of the exhaust fan, bringing certain favorable effects on actual use, and solving the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: a new type of backflow prevention exhaust fan comprises an exhaust duct, the left side of the exhaust duct is fixedly installed with an backflow prevention frame, the exhaust duct is provided with a sliding groove on the left side near the inner wall thereof, the inner wall of the sliding groove is slidably connected with a filter screen plate 1, the surface of the filter screen plate 1 is connected with a clamping assembly, the left side of the filter screen plate 1 is fixedly connected with a dust box, the right side of the filter screen plate 1 is fixedly installed on the exhaust duct near the inner wall thereof, the right side of the inner wall of the exhaust duct is fixedly installed with a first fan, the bottom of the exhaust duct is fixedly connected with an air exchange pipe, the left side of the air exchange pipe is provided with a chip collection chamber with a sealing door, the bottom of the inner wall of the air exchange pipe is rotatably connected with a switch baffle through a driving end, the second fan with a filter screen sleeve is fixedly installed on the surface of the inner wall of the air exchange pipe, and the right side of the air exchange pipe is fixedly connected to a connecting pipe with a filter screen.

[0006] Preferably, the main body of the backflow prevention frame is a sealed rectangular frame, the inner wall of the sealed rectangular frame is fixedly connected to a spring telescopic rod through a bracket, one end of the spring telescopic rod is fixedly connected to a sealing baffle, and the area range of the sealing baffle is larger than the area range of the vent on the backflow prevention frame.

[0007] Preferably, a buffer pad is fixedly connected to the left side of the sealing baffle, and the surface of the buffer pad is coated with a wear-resistant coating.

[0008] Preferably, the snap-fit ​​assembly includes a snap plate and a snap sleeve, the snap plate is fixedly connected to the surface of the filter screen plate, the snap sleeve is fixedly connected to the inner wall of the sliding groove, and the inner wall of the snap sleeve and the surface of the snap plate are snapped and adapted.

[0009] Preferably, a guide plate is fixedly connected to the bottom of the inner wall of the exhaust duct, the upper surface of the guide plate is opened as a smooth surface, and the surface of the guide plate is directly above the chip collection chamber.

[0010] Preferably, two driving motors are fixedly installed on the top of the exhaust duct, the output end of the driving motor is fixedly connected to a rotating rod, the surface of the rotating rod is fixedly connected to a shock absorber, one end of the shock absorber is fixedly connected to an elastic ball pad, and the surface of the elastic ball pad abuts against the surface of filter plate one and filter plate two.

[0011] Compared with the prior art, the beneficial effects of the utility model are:

[0012] 1. In the utility model, the exhaust work is performed by operating the first and second fans, and the indoor gas is planned to be discharged to the lower right. The extracted and discharged gas will first be filtered through the filter screen plate 1 and the filter screen plate 2 to filter the particulate impurities contained in the discharged gas, and the left side of the filter screen plate 1 and the filter screen plate 2 will intercept some particulate impurities;

[0013] 2. In the utility model, the driving motor is started to drive the rotating rod to rotate, and the rotation of the rotating rod can drive the elastic ball pad to hit the filter screen plate 1 and the filter screen plate 2, so that the impurities are ejected and dropped to the bottom, which can be inside the dust box and above the guide plate. The smooth surface of the guide plate can help guide it to the inside of the chip collection chamber, so as to collect and clean the particle impurities in a unified manner later;

[0014] 3. In the utility model, when the exhaust gas from the exhaust duct is backflowed, the sealing baffle in the anti-backflow frame can be moved close to the vent on the anti-backflow frame under the impact of the right wind, and the sealing blockage is achieved to prevent the backflow. The erosion degree of wind force during normal exhaust is reduced by the setting of the buffer pad. Since the filter plate 1 contacts the exhaust gas first, more impurities will accumulate on the filter plate 1, which is easy to cause blockage. When it is subsequently cleaned and maintained, the sleeve and the card plate can be disassembled in the sliding groove to remove the filter plate 1, and the filter plate 1 can be subsequently cleaned and maintained. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0016] Figure 2 It is a schematic diagram of the cross-sectional structure of the exhaust pipe in the utility model;

[0017] Figure 3 It is a partial cross-sectional structural schematic diagram of the backflow prevention frame in the utility model;

[0018] Figure 4 It is a structural schematic diagram of the transfer rod of the utility model;

[0019] Figure 5 It is a schematic diagram of the partial cross-section structure of the ventilation pipe in the utility model;

[0020] Figure 6 It is an enlarged view of point A of the present utility model.

[0021] In the figure: 1. exhaust duct; 2. anti-backflow frame; 3. sliding groove; 4. filter plate one; 5. dust collection box; 6. filter plate two; 7. first fan; 8. ventilation pipe; 9. chip collection chamber; 10. switch baffle; 11. second fan; 12. connecting pipe; 13. spring telescopic rod; 14. sealing baffle; 15. buffer pad; 16. clamping plate; 17. clamping sleeve; 18. guide plate; 19. drive motor; 20. rotating rod; 21. shock absorber; 22. elastic ball pad. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] Example 1, please refer to Figures 1 to 6The utility model provides a technical solution: a new type of backflow prevention exhaust fan, comprising an exhaust duct 1, an anti-backflow frame 2 is fixedly installed on the left side of the exhaust duct 1, a sliding groove 3 is opened on the exhaust duct 1 near the left side of its inner wall, a filter screen plate 4 is slidably connected to the inner wall of the sliding groove 3, a clamping assembly is connected to the surface of the filter screen plate 4, a dust box 5 is fixedly connected to the left side of the filter screen plate 4, a filter screen plate 2 6 is fixedly installed on the right side of the exhaust duct 1 near the inner wall, a first fan 7 is fixedly installed on the right side of the inner wall of the exhaust duct 1, an air exchange pipe 8 is fixedly connected to the bottom of the exhaust duct 1, a chip collection chamber 9 with a sealing door is opened on the left side of the air exchange pipe 8, a switch baffle 10 is rotatably connected to the bottom of the inner wall of the air exchange pipe 8 through a driving end, a second fan 11 with a filter screen sleeve is fixedly installed on the surface of the inner wall of the air exchange pipe 8, and a connecting pipe 12 with a filter screen is fixedly connected to the right side of the air exchange pipe 8.

[0024] Furthermore, the snap-on assembly includes a snap plate 16 and a snap sleeve 17, wherein the snap plate 16 is fixedly connected to the surface of the filter screen plate 4, and the snap sleeve 17 is fixedly connected to the inner wall of the sliding groove 3, and the inner wall of the snap sleeve 17 and the surface of the snap plate 16 are snapped and adapted to each other. The snap sleeve 17 and the snap plate 16 are disassembled in the sliding groove 3 to remove the filter screen plate 4, and the filter screen plate 4 is subsequently cleaned and maintained.

[0025] Furthermore, a guide plate 18 is fixedly connected to the bottom of the inner wall of the exhaust duct 1, and the upper surface of the guide plate 18 is opened as a smooth surface, and the surface of the guide plate 18 is directly above the chip collection chamber 9. The smooth surface of the guide plate 18 can help guide it to the inside of the chip collection chamber 9, so as to carry out the subsequent unified collection and cleaning of particulate impurities.

[0026] Furthermore, two driving motors 19 are fixedly installed on the top of the exhaust duct 1, and the output end of the driving motor 19 is fixedly connected to a rotating rod 20, and the surface of the rotating rod 20 is fixedly connected to a shock absorber 21, and one end of the shock absorber 21 is fixedly connected to an elastic ball pad 22, and the surface of the elastic ball pad 22 abuts against the surface of the filter plate 1 4 and the filter plate 2 6. When the driving motor 19 is started, it can drive the rotating rod 20 to rotate, and the rotation of the rotating rod 20 can drive the elastic ball pad 22 to hit the filter plate 1 4 and the filter plate 2 6, and knock the impurities to the bottom.

[0027] Example 2, please refer to Figures 1 to 6The difference between this embodiment and embodiment 1 is that the main body of the anti-backflow frame 2 is a sealed rectangular frame, and the inner wall of the sealed rectangular frame is fixedly connected to a spring telescopic rod 13 through a bracket, and one end of the spring telescopic rod 13 is fixedly connected to a sealing baffle 14, and the area range of the sealing baffle 14 is larger than the area range of the vent on the anti-backflow frame 2. A buffer pad 15 is fixedly connected to the left side of the sealing baffle 14, and the surface of the buffer pad 15 is coated with a wear-resistant coating. If the exhaust gas inside the exhaust pipe 1 flows back, the sealing baffle 14 in the anti-backflow frame 2 can move close to the vent on the anti-backflow frame 2 under the impact of the right wind, and perform abutment and sealing to achieve the anti-backflow effect. The setting of the buffer pad 15 reduces the degree of wind erosion during normal exhaust.

[0028] Working principle: When the new type of anti-backflow exhaust fan is in use, under normal circumstances, when the entire exhaust fan device operates to exhaust indoor gas, the control switch baffle 10 can be driven to allow the inside of the ventilation pipe 8 to leak out and contact with the outside air, and then the first fan 7 and the second fan 11 operate to exhaust the air, and plan the indoor gas to be discharged to the lower right. The extracted and discharged gas will first pass through the filter plate 1 4 and the filter plate 2 6 for filtration to filter the particulate impurities contained in the exhaust gas, and the filter plate 1 4 and the filter plate 2 6 will retain some particulate impurities on the left side. The driving motor 19 can drive the rotating rod 20 to rotate when it is started. The rotation of the rotating rod 20 can drive the elastic ball pad 22 to hit the filter plate 1 4 and the filter plate 2 6, and the impurities will be knocked down to the bottom, which can be in the dust box 5 and the guide plate 1 8, the smooth surface of the guide plate 18 can help guide it to the inside of the chip collection chamber 9, so as to carry out the subsequent unified collection and cleaning of particulate impurities. If the exhaust gas in the exhaust duct 1 flows back, the sealing baffle 14 in the anti-backflow frame 2 can be moved close to the vent on the anti-backflow frame 2 under the impact of the right wind, and the sealing blockage is achieved to achieve the anti-backflow effect. The setting of the buffer pad 15 reduces the degree of wind erosion during normal exhaust. Because the filter screen plate 4 contacts the exhaust gas first, the filter screen plate 4 will accumulate more impurities and easily cause blockage. When cleaning and maintenance are carried out later, the sleeve 17 and the card plate 16 can be disassembled in the sliding groove 3 to remove the filter screen plate 4, and the subsequent cleaning and maintenance of the filter screen plate 4 can be carried out, thereby ensuring the filtering exhaust and anti-backflow treatment functions of the exhaust fan equipment.

[0029] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A novel exhaust fan for preventing backflow, comprising an exhaust duct (1), characterized in that: The left side of the exhaust duct (1) is fixedly provided with an anti-backflow frame (2); the exhaust duct (1) is provided with a sliding groove (3) on the left side near the inner wall thereof; the inner wall of the sliding groove (3) is slidably connected with a filter screen plate 1 (4); the surface of the filter screen plate 1 (4) is connected with a snap-on assembly; the left side of the filter screen plate 1 (4) is fixedly connected with a dust collecting box (5); the right side of the exhaust duct (1) is fixedly provided with a filter screen plate 2 (6); the exhaust duct (1) is provided with a filter screen plate 3 (7); the exhaust duct (2) is provided with a filter screen plate 4 (8); 1) A first fan (7) is fixedly installed on the right side of the inner wall, a ventilation pipe (8) is fixedly connected to the bottom of the exhaust pipe (1), a chip collection chamber (9) with a sealing door is opened on the left side of the ventilation pipe (8), a switch baffle (10) is rotatably connected to the bottom of the inner wall of the ventilation pipe (8) through a driving end, a second fan (11) with a filter sleeve is fixedly installed on the surface of the inner wall of the ventilation pipe (8), and a connecting pipe (12) with a filter is fixedly connected to the right side of the ventilation pipe (8).

2. The novel anti-backflow exhaust fan according to claim 1 is characterized in that: The main body of the backflow prevention frame (2) is a sealed rectangular frame, the inner wall of which is fixedly connected to a spring telescopic rod (13) via a bracket, one end of the spring telescopic rod (13) is fixedly connected to a sealing baffle (14), and the area range of the sealing baffle (14) is larger than the area range of the vent on the backflow prevention frame (2).

3. A novel anti-backflow exhaust fan according to claim 2, characterized in that: A buffer pad (15) is fixedly connected to the left side of the sealing baffle (14), and the surface of the buffer pad (15) is coated with a wear-resistant coating.

4. The novel anti-backflow exhaust fan according to claim 1 is characterized in that: The clamping assembly comprises a clamping plate (16) and a clamping sleeve (17); the clamping plate (16) is fixedly connected to the surface of the filter screen plate (4); the clamping sleeve (17) is fixedly connected to the inner wall of the sliding groove (3); the inner wall of the clamping sleeve (17) and the surface of the clamping plate (16) are clamped and adapted.

5. The novel anti-backflow exhaust fan according to claim 1 is characterized in that: A guide plate (18) is fixedly connected to the bottom of the inner wall of the exhaust duct (1), the upper surface of the guide plate (18) is formed into a smooth surface, and the surface of the guide plate (18) is directly above the chip collection chamber (9).

6. The novel anti-backflow exhaust fan according to claim 1 is characterized in that: Two drive motors (19) are fixedly mounted on the top of the exhaust duct (1); the output end of the drive motor (19) is fixedly connected to a rotating rod (20); the surface of the rotating rod (20) is fixedly connected to a shock absorber (21); one end of the shock absorber (21) is fixedly connected to an elastic ball pad (22); the surface of the elastic ball pad (22) abuts against the surface of the first filter screen plate (4) and the second filter screen plate (6).

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