Air pipe for range hood

Abstract

The utility model relates to the field of range hoods, and discloses an air pipe for a range hood, which comprises an air pipe and a mounting flange, one end of the air pipe connected with the range hood is connected through the mounting flange, one end of the air pipe away from the range hood is fixedly connected with an external thread mounting pipe, and the cylindrical surface of the external thread mounting pipe is in threaded connection with two groups of symmetrical fixing structures. The end, deviating from the air pipe, of the external thread mounting pipe is connected with an air filling prevention structure through a mounting flange, when an air pipe of an existing range hood is connected with the outside, the air pipe is clamped in a hole of a window or a wall, the clamping mode is extremely unstable, and in addition, the end, making contact with the outside, of the air pipe cannot be blocked when the outside has strong wind weather. Or in some special air pressure environments, air can be reversely injected into the air pipe from the end of the air pipe, the air pipe fixing structure aims at increasing connection between the fixing structure and the inner side and the outer side of a window or a wall body, an air injection prevention structure is additionally arranged at the external exhaust end of the air pipe, and air can only be exhausted to the outside from one end of the air pipe.

Description

Technical Field

[0001] This utility model relates to the field of range hoods, specifically to a duct for range hoods. Background Technology

[0002] The ductwork of a range hood is an important component of the range hood system. When the range hood is working, the fan creates a negative pressure environment inside, drawing in cooking fumes, heat, and odors from the kitchen. The ductwork is responsible for transporting these drawn-in substances outdoors, keeping the kitchen air clean. Without ductwork or if the ductwork is blocked, cooking fumes will permeate the kitchen, leading to poor air quality and contaminating surfaces such as walls and furniture. In addition to exhausting smoke, the ductwork also assists in the kitchen's ventilation function. Even when no cooking fumes are being produced, the ductwork can expel stale air from the kitchen and introduce fresh outdoor air, improving the overall kitchen environment.

[0003] Existing range hood ducts are simply clipped between windows and window frames or into holes in walls when connected to the outside. This connection method is extremely unstable. During use, due to various factors such as daily vibrations and wind, the duct can easily become loose. In addition, when there is strong wind or under certain air pressure conditions, wind can flow back into the duct from the end that is in contact with the outside. Therefore, we have proposed a new type of duct for range hoods. Utility Model Content

[0004] In view of the shortcomings of the existing technology, this utility model provides a duct for range hoods, which solves the above-mentioned problems.

[0005] To achieve the above-mentioned objectives, this utility model provides the following technical solution: a duct for a range hood, comprising a duct and a mounting flange, wherein one end of the duct is connected to the range hood via the mounting flange, and the end of the duct away from the range hood is fixedly connected to an external threaded mounting pipe, wherein two sets of symmetrical fixing structures are threaded on the cylindrical surface of the external threaded mounting pipe, and the end of the external threaded mounting pipe away from the duct is connected to an anti-airflow structure via the mounting flange.

[0006] Preferably, the fixing structure includes a fixing ring, a support plate, and a threaded hole. The inner ring of the fixing ring is provided with an internal thread, which is coaxially threaded with the outer cylindrical surface of the external threaded mounting pipe. Three support plates evenly distributed in a circular arrangement are fixedly connected to the outer cylindrical surface of the fixing ring. Each support plate has a threaded hole through it on one side corresponding to the plane of the fixing ring.

[0007] Preferably, three other circumferentially evenly distributed support plates are fixedly connected to the cylindrical surface of the fixing ring. Each support plate has a through-hole on one side corresponding to the plane of the fixing ring. The three support plates corresponding to the mounting holes are arranged alternately with the three support plates corresponding to the threaded holes.

[0008] Preferably, the fixing structure further includes a suction cup, a rubber plug, and a vent tube. The vent tube is fixedly connected to the smaller radius end of the suction cup, and the rubber plug is fixedly connected to the cylindrical surface of the other end of the vent tube. The vent tube is coaxially snapped into the mounting hole, and the larger radius ends of the two sets of symmetrical fixing structures are opposite each other.

[0009] Preferably, the anti-airflow structure includes a round-square tube, a square tube, an opening and closing triangular plate, and an automatic closing hinge. One round end of the round-square tube is fixedly connected to the end of the external threaded mounting pipe opposite to the air duct via a mounting flange. The other end of the round-square tube is fixedly connected to the square tube. The four sides inside the square tube are all fixedly connected to the automatic closing hinge via screws. The other side of the automatic closing hinge is fixedly connected to the hypotenuse of the opening and closing triangular plate via screws. The adjacent right-angled sides of the four opening and closing triangular plates fit together.

[0010] Preferably, the anti-wind-in structure further includes limiting plates, with four limiting plates fixedly connected to the four corners of the four sides inside the square tube on two adjacent sides. The limiting plates are located between the opening and closing triangular plate and the square tube, with one side of the limiting plate corresponding to the opening and closing triangular plate fitting against the opening and closing triangular plate.

[0011] Compared with the prior art, this utility model provides a duct for a range hood, which has the following beneficial effects:

[0012] 1. This is a duct for range hoods. The duct passes through the window or wall and is installed with a fixed structure connecting to both the inside and outside of the window or wall. The fixed structure includes two methods: suction cup connection and screw connection. Choose the appropriate connection method according to the actual installation location. It is suitable for different building structures and is easy to disassemble. The spacing between the fixed structures is adjustable, making it suitable for walls or windows of different thicknesses.

[0013] 2. The duct used for range hoods has an anti-airflow structure added to the exhaust end. Air can only be discharged to the outside from one end, and the outside air cannot open the anti-airflow structure to enter the duct. At the same time, the kitchen fumes are discharged smoothly, while preventing dust, debris and other objects from the outside from being brought into the duct. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 This is an exploded view of the structure of this utility model;

[0016] Figure 3This is a cross-sectional schematic diagram of the suction cup structure installation and anti-airflow structure of this utility model;

[0017] Figure 4 for Figure 3 A magnified view of part A in the diagram;

[0018] Figure 5 for Figure 3 A magnified view of part B in the diagram.

[0019] In the diagram: 1. Air duct; 2. Mounting flange; 3. External threaded mounting pipe; 4. Fixing ring; 5. Round / square tube; 6. Square tube; 7. Opening / closing triangular plate; 8. Support plate; 9. Suction cup; 10. Threaded hole; 11. Mounting hole; 12. Rubber plug; 13. Internal thread; 14. Limiting plate; 15. Automatic closing hinge; 16. Vent pipe. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Please see Figure 1-5 A duct for a range hood includes a duct 1 and a mounting flange 2. One end of the duct 1 is connected to the range hood via the mounting flange 2. The end of the duct 1 away from the range hood is fixedly connected to an externally threaded mounting pipe 3. Two sets of symmetrical fixing structures are threaded on the cylindrical surface of the externally threaded mounting pipe 3. The end of the externally threaded mounting pipe 3 away from the duct 1 is connected to an anti-airflow structure via the mounting flange 2.

[0022] Furthermore, the fixing structure includes a fixing ring 4, a support plate 8, and a threaded hole 10. The inner ring of the fixing ring 4 is provided with an internal thread 13, which is coaxially threaded to the outer cylindrical surface of the external threaded mounting tube 3. Three support plates 8 are fixedly connected to the outer cylindrical surface of the fixing ring 4, which are evenly distributed in a circular arrangement. Each support plate 8 has a threaded hole 10 through it on one side corresponding to the plane of the fixing ring 4. The fixing ring 4 is used to install the support plate 8, and the support plate 8 is used to open the threaded hole 10. The threaded hole 10 is used to thread screws, which are used to connect to windows or walls. The internal thread 13 is used for the threaded connection between the fixing ring 4 and the external threaded mounting tube 3. The fixing ring 4 can be rotated on the external threaded mounting tube 3 to adjust the distance between the two fixing rings 4.

[0023] Furthermore, three additional support plates 8 are fixedly connected to the cylindrical surface of the fixing ring 4, which are evenly distributed in a circular pattern. Each support plate 8 has a through-hole 11 on one side corresponding to the plane of the fixing ring 4. The three support plates 8 corresponding to the mounting holes 11 and the three support plates 8 corresponding to the threaded holes 10 are arranged alternately. The support plates 8 are used to open the mounting holes 11. The support plates 8 corresponding to the threaded holes 10 and the support plates 8 corresponding to the mounting holes 11 are arranged alternately to maintain stability when connected to the wall or window.

[0024] Furthermore, the fixing structure also includes a suction cup 9, a rubber plug 12, and a vent pipe 16. The smaller radius end of the suction cup 9 is fixedly connected to the vent pipe 16, and the cylindrical surface of the other end of the vent pipe 16 is fixedly connected to the rubber plug 12. The vent pipe 16 is coaxially snapped into the mounting hole 11. The larger radius ends of the two sets of symmetrical fixing structures of suction cup 9 are opposite each other. The suction cup 9 is used to connect to the window or wall. The vent pipe 16 is used to connect the suction cup 9 to the support plate 8 and the threaded hole 10. The rubber plug 12 is used to connect or disconnect the suction cup 9 from the outside air. When the suction cup 9 is in close contact with the wall or window surface, the air inside the suction cup 9 is squeezed out, making the air pressure inside the suction cup 9 lower than the outside atmospheric pressure. Due to the decrease in the air pressure inside the suction cup 9, an air pressure difference is formed inside and outside. The outside atmospheric pressure will press the suction cup 9 tightly against the wall or window surface.

[0025] Furthermore, the anti-airflow structure includes a round square tube 5, a square tube 6, an opening and closing triangular plate 7, and an automatic closing hinge 15. One round end of the round square tube 5 is fixedly connected to the end of the external threaded mounting pipe 3 away from the air duct 1 via a mounting flange 2. The other end of the round square tube 5 is fixedly connected to the square tube 6. The four sides of the square tube 6 are all fixedly connected to the automatic closing hinge 15 by screws. The other side of the automatic closing hinge 15 is fixedly connected to the hypotenuse of the opening and closing triangular plate 7 by screws. The adjacent right-angled sides of the four opening and closing triangular plates 7 fit together. The round square tube 5 is used to connect the square tube 6 and the external threaded mounting pipe 3. The square tube 6 is used to install the opening and closing triangular plate 7. The automatic closing hinge 15 is used to connect the square tube 6 and the opening and closing triangular plate 7. When the opening and closing triangular plate 7 is not subjected to other external forces, the automatic closing hinge 15 makes the opening and closing triangular plate 7 automatically close into a complete square structure.

[0026] Furthermore, the anti-wind-in structure also includes limiting plates 14. Four limiting plates 14 are fixedly connected to the four corners of the four sides inside the square tube 6. The limiting plates 14 are between the opening and closing triangle plate 7 and the round square tube 5. The side of the limiting plate 14 corresponding to the opening and closing triangle plate 7 is in contact with the opening and closing triangle plate 7. The limiting plates 14 are used to support the opening and closing triangle plate 7 so that it does not open in the direction of the round square tube 5.

[0027] Ductwork and connecting components

[0028] Duct 1: As the core channel for oil fume transmission, it is connected to the range hood at one end by mounting flange 2, through which oil fumes enter the duct.

[0029] Installation flange 2: It has a dual connection and fixing function. First, it connects the air duct 1 to the range hood. Second, it connects the external threaded installation pipe 3 to the anti-airflow structure, effectively preventing oil fumes from leaking from the connection point.

[0030] External threaded mounting pipe 3: Installed at the end of the duct 1 away from the range hood, with threads on the outer surface for engaging with the internal thread 13 of the fixed structure, and also serving as the connection base for the anti-airflow structure.

[0031] Fixed structure

[0032] Fixed ring 4: The inner ring has an internal thread 13, which can mate with the thread on the outer cylindrical surface of the external thread mounting tube 3 to achieve rotation and distance adjustment. The outer ring has six support plates 8 evenly distributed, three of which have threaded holes 10 and the other three have mounting holes 11, and the two types of support plates 8 are arranged alternately.

[0033] Support plate 8: Fixed to the outer ring of the fixing ring 4, there are two types. Support plate 8 with threaded hole 10 can fix the air duct to the wall or window with screws; support plate 8 with mounting hole 11 is used to install suction cup 9 and related components.

[0034] Threaded hole 10: On part of the support plate 8, used to fit screws so that the duct can be securely installed on the wall or window.

[0035] Mounting hole 11: Located on another part of the support plate 8, it can be coaxially connected to the air pipe 16, and then the suction cup 9 can be installed.

[0036] Suction cup 9: The small-radius end connects to the vent pipe 16, while the large-radius end is used to adhere to walls or windows. Once it makes tight contact with the surface and forces out internal air, it utilizes the pressure difference between the inside and outside to achieve fixation, assisting in duct installation.

[0037] Rubber stopper 12: Connected to the cylindrical surface of the other end of the vent tube 16, it can control the connection or disconnection between the suction cup 9 and the outside gas, thereby controlling the adsorption and release of the suction cup 9.

[0038] Vent tube 16: One end is connected to suction cup 9, and the other end can be inserted into mounting hole 11 to connect suction cup 9 and support plate 8, while working with rubber plug 12 to control gas flow.

[0039] Anti-airflow structure

[0040] Round-square tube 5: One end is round, which is connected to the external threaded mounting tube 3 through the mounting flange 2, and the other end is square, which is connected to the square tube 6, serving as an interface transition.

[0041] Square tube 6: The four sides inside are fixed with screws to the automatic closing hinge 15, providing installation and movement space for the opening and closing triangle plate 7.

[0042] Opening and closing triangle plate 7: It is connected to the square tube 6 through the automatic closing hinge 15. The adjacent right-angled sides of the four opening and closing triangle plates 7 are attached. When there is no external force, the automatic closing hinge 15 closes it into a square structure, preventing outside air from flowing back into the air duct.

[0043] Automatic closing hinge 15: Connects square tube 6 and opening / closing triangle plate 7, has automatic closing characteristics, and ensures that opening / closing triangle plate 7 is in a closed state when there is no external force, preventing air backflow.

[0044] Limiting plates 14: Four limiting plates 14 are fixed at the four corners of the four sides inside the square tube 6, between the opening and closing triangle plate 7 and the round square tube 5, and are in contact with the opening and closing triangle plate 7 to prevent the opening and closing triangle plate 7 from opening towards the round square tube 5, thus ensuring the normal operation of the anti-airflow structure.

[0045] Working principle: Install the mounting flange 2 at one end of the duct 1 onto the range hood. Adjust the length and direction of the duct 1 according to the actual installation location. Pass the externally threaded mounting tube 3 through the pre-drilled window or wall hole. One retaining ring 4 is inside, and the other retaining ring 4 is outside. The internal threads 13 of the two retaining rings 4 rotate on the externally threaded mounting tube 3 to adjust the distance according to the wall or window thickness. Select a suitable connection method based on the flatness of the wall or window. If connecting to a relatively smooth surface such as glass or tile, use the suction cup 9. Rotate the retaining ring 4 to compress the suction cup 9 against the glass or tile, and insert the rubber plug 12 between the vent pipes 16 to complete the fixed connection. If connecting to a rougher, uneven surface such as water... When using a mud wall, choose screw connection. Screw the screw into the threaded hole 10 and insert it into the cement wall to complete the fixed connection. When disassembly is required, unscrew the corresponding screw or pull out the rubber plug 12 in the vent pipe 16 to easily remove it. When the range hood is in use, the oil fumes extracted by the range hood are discharged through the duct 1 and the external threaded mounting pipe 3. When the air carrying oil fumes reaches the opening and closing triangle plate 7, the air force pushes the opening and closing triangle plate 7 open, and the limiting plate 14 opens the opening and closing triangle plate 7, and the oil fumes are finally discharged outdoors. When the range hood is not in use, the automatic closing hinge 15 automatically closes the opening and closing triangle plate 7, and the limiting plate 14 prevents the opening and closing triangle plate 7 from opening into the round and square pipe 5, thus preventing the air from flowing back into the round and square pipe 5 and entering the range hood.

[0046] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A duct for a range hood, comprising a duct (1) and a mounting flange (2), the end of the duct (1) connected to the range hood being connected by means of the mounting flange (2), characterized in that: The duct (1) is fixedly connected to the external threaded mounting pipe (3) at the end away from the range hood. The external threaded mounting pipe (3) has two sets of symmetrical fixed structures connected by threads on its cylindrical surface. The end of the external threaded mounting pipe (3) away from the duct (1) is connected to the anti-airflow structure through the mounting flange (2).

2. An air duct for a range hood according to claim 1, characterized in that: The fixing structure includes a fixing ring (4), a support plate (8), and a threaded hole (10). The inner ring of the fixing ring (4) is provided with an internal thread (13), which is coaxially threaded with the outer cylindrical surface of the external threaded mounting pipe (3). Three support plates (8) are fixedly connected to the outer cylindrical surface of the fixing ring (4) in a uniformly distributed circumferential arrangement. The support plates (8) are provided with threaded holes (10) on one side corresponding to the plane of the fixing ring (4).

3. An air duct for a range hood according to claim 2, characterized in that: The fixed ring (4) is fixedly connected to three other circumferentially evenly distributed support plates (8). Each support plate (8) has a through hole (11) on one side of the plane corresponding to the fixed ring (4). The three support plates (8) corresponding to the mounting holes (11) and the three support plates (8) corresponding to the threaded holes (10) are arranged alternately.

4. An air duct for a range hood according to claim 3, characterized in that: The fixing structure also includes a suction cup (9), a rubber plug (12) and a vent pipe (16). The smaller radius end of the suction cup (9) is fixedly connected to the vent pipe (16), and the cylindrical surface of the other end of the vent pipe (16) is fixedly connected to the rubber plug (12). The vent pipe (16) is coaxially snapped into the mounting hole (11). The larger radius ends of the two sets of symmetrical fixing structures of suction cup (9) are opposite each other.

5. An air duct for a range hood according to claim 1, characterized in that: The anti-airflow structure includes a round square tube (5), a square tube (6), an opening and closing triangle plate (7), and an automatic closing hinge (15). One round end of the round square tube (5) is fixedly connected to the end of the external threaded mounting pipe (3) away from the air duct (1) through the mounting flange (2). The other end of the round square tube (5) is fixedly connected to the square tube (6). The four sides inside the square tube (6) are all fixedly connected to the automatic closing hinge (15) by screws. The other side of the automatic closing hinge (15) is fixedly connected to the hypotenuse of the opening and closing triangle plate (7) by screws. The adjacent right-angle sides of the four opening and closing triangle plates (7) are in contact with each other.

6. An air duct for a range hood according to claim 5, characterized in that: The anti-airflow structure also includes a limiting plate (14). The four limiting plates (14) are fixedly connected to the four corners of the four sides inside the square tube (6). The limiting plate (14) is between the opening and closing triangle plate (7) and the round square tube (5). The side of the limiting plate (14) corresponding to the opening and closing triangle plate (7) is in contact with the opening and closing triangle plate (7).

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