A flue connection assembly

Abstract

The application discloses a smoke exhaust pipe connecting assembly, which comprises a smoke exhaust pipe and an air outlet cover connected with the smoke exhaust pipe, wherein the air outlet cover comprises a hollow cover body with two open ends, an annular groove is formed at the top of the cover body, and the smoke exhaust pipe is connected into the groove; and a metal ring is embedded into the groove.

Description

Technical Field

[0001] This invention relates to an oil fume purification device, and more particularly to a smoke exhaust pipe connection assembly. Background Technology

[0002] The exhaust pipes and connectors of existing range hoods are all connected by flexible means, and aluminum foil tape is usually used to fix the exhaust pipes to the connectors.

[0003] For example, Chinese invention patent application number 201720895177.1 discloses a flue gas pipe diameter changing adapter structure, which includes a connector and an adapter body. The connector is set on the top surface of the adapter body, and the connector and the adapter body are provided with through holes for oil fume circulation. The connector includes an upper connecting part, a middle connecting part and a lower connecting part. The upper connecting part includes an upper inner ring and an upper outer ring of the connector. A first gap groove for snapping aluminum foil tube is formed between the upper inner ring and the upper outer ring of the connector. The aluminum foil tube is snapped in the first gap groove. Aluminum foil tape is adhered between the upper outer ring of the connector and the aluminum foil tube.

[0004] The existing flue assembly has the following problems:

[0005] ① The plastic exhaust hood has a wall thickness of 1-2mm. Due to the precision of the mold, the expansion and contraction caused by the ambient temperature, and the force exerted by the installer when applying the tape, the round exhaust hood may deform. If the clearance between the exhaust hood and the flue is insufficient, installation will be difficult.

[0006] ② The connection surface between the exhaust pipe and the connector is not flat but a variable irregular shape. When the tape is wrapped and bonded, wrinkles will appear, resulting in gaps. The wind pressure at the exhaust pipe will cause the tape to vibrate continuously. After long-term operation, this will cause the tape and exhaust pipe to detach, resulting in smoke and oil leaks.

[0007] ③ The exhaust hood is made of plastic and has a certain degree of hardness, while the flue is a soft component. When applying adhesive tape, it is difficult to control the bonding strength between the aluminum foil and the tape.

[0008] ④ When the range hood is running, the aluminum foil at the exhaust pipe interface will be subjected to wind pressure, which will cause the external adhesive tape to vibrate continuously. Over time, the external adhesive tape and the flue will fall off, resulting in smoke and oil leakage.

[0009] ⑤ When the screw passes through the aluminum foil flue hole, it will expand vertically, making it unable to effectively fix the flue and exhaust hood. In addition, the puncture hole will also become an oil leak hole. Summary of the Invention

[0010] The first technical problem to be solved by the present invention is to provide a smoke exhaust pipe connection assembly that reduces the deformation of the exhaust hood, addressing the problems existing in the prior art.

[0011] The second technical problem to be solved by the present invention is to provide a smoke exhaust pipe connection assembly that can make the smoke exhaust pipe connection secure, in order to address the problems existing in the prior art.

[0012] The third technical problem to be solved by the present invention is to provide a smoke exhaust pipe connection assembly that can improve the sealing performance of the connection between the smoke exhaust pipe and the exhaust hood, in order to address the problems existing in the prior art.

[0013] The technical solution adopted by the present invention to solve the first technical problem mentioned above is: a smoke exhaust pipe connection assembly, including a smoke exhaust pipe and an air outlet hood connected to the smoke exhaust pipe, the air outlet hood including a hood body with openings at both ends and being hollow, the top of the hood body having an annular groove, and the smoke exhaust pipe being connected to the groove;

[0014] Its features are:

[0015] A metal ring is embedded in the groove.

[0016] By embedding a metal ring to fix the inner ring wall of the exhaust hood, the strength of the metal is used to limit the dimensional deformation of the assembly position, thus achieving the purpose of easily installing the exhaust pipe.

[0017] The technical solution adopted by the present invention to solve the second technical problem mentioned above is as follows: the exhaust pipe includes an aluminum foil tube and steel wires supporting the aluminum foil tube, and the steel wires are distributed in a spiral shape;

[0018] The metal ring includes a body extending vertically, a first flange bent inward from the top of the body, and a second flange bent inward from the bottom of the body. The inner diameter of the first flange is smaller than the diameter of the steel wire. At least the bottommost portion of the exhaust pipe is pressed into the metal ring and located between the first flange and the second flange.

[0019] Therefore, by using an interference fit and physical compression, the steel wire of the exhaust pipe is pressed into the metal ring to achieve a secure fixation.

[0020] Furthermore, to prevent the steel wire from detaching from the metal ring, the metal ring also includes a third flange that bends upward from the inner circumference of the second flange. The portion of the metal ring corresponding to the inserted steel wire has at least one third flange.

[0021] Furthermore, the exhaust pipe connection assembly also includes a pressure plate, which presses against the upper surface of the first flange of the metal ring. This balances the force on the steel wire, further preventing the steel wire from detaching from the metal ring.

[0022] Furthermore, in order to fix the pressure plate to the air outlet cover, the pressure plate is also fixed to the air outlet cover by screws, and at least two fixing points for screw fixing are evenly distributed along the circumference of the air outlet cover.

[0023] The technical solution adopted by the present invention to solve the third technical problem mentioned above is as follows: the groove is filled with a sealing liquid, and the bottom of the exhaust pipe extends into the sealing liquid.

[0024] By filling with a sealing liquid and utilizing the principle of communicating vessels, after the range hood is turned on, the pressure inside the exhaust pipe will push down the liquid between the exhaust pipe and the inner wall of the groove. The descending liquid will be transferred through the bottom connection to the channel between the exhaust pipe and the outer wall of the groove, thereby causing the liquid level on the outside to rise, achieving a reliable seal that prevents air and smoke leakage.

[0025] Preferably, the sealing liquid is a liquid with a viscosity greater than 100 mPa·s, thereby utilizing the viscosity of the liquid itself to achieve the effect of damping the air pressure in the pipeline.

[0026] Furthermore, the first flange of the metal ring has a recessed cut from the inside out, through which the sealing liquid can flow. This cut channel ensures that the metal ring can be completely submerged in the liquid sealing material.

[0027] Furthermore, at least part of the two adjacent steel wires at the bottom of the exhaust pipe are pressed into the metal ring, and the aluminum foil tube between the two steel wires is folded toward the inner wall of the groove.

[0028] Compared to conventional exhaust pipes, the inward fold between the two coils of steel wire effectively reduces the connecting area inside the communicating vessel. With the same pipe pressure, the same amount of sealing liquid, and the same resistance of the metal ring flange, the reduction in the inner contact area further weakens the conversion of the kinetic energy of the pipe's air pressure into the potential energy of the outer liquid's rise, thus further achieving the purpose of damping and reducing pressure.

[0029] Compared with the prior art, the advantages of the present invention are as follows: by embedding a metal ring to fix the inner ring wall of the exhaust hood, the metal strength is used to limit the dimensional deformation of the assembly position, so as to easily install the exhaust pipe; by using an interference fit physical extrusion method, the steel wire of the exhaust pipe is pressed into the metal ring to achieve a firm fixation; by using the sealing liquid, the metal ring flange and the exhaust pipe inward fold, the kinetic energy of the pipe wind pressure is weakened and converted into the potential energy of the outer liquid rise, so as to achieve the purpose of damping and pressure reduction. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the exhaust pipe connection assembly according to an embodiment of the present invention;

[0031] Figure 2 This is a schematic diagram of the smoke exhaust pipe connection assembly concealing the smoke exhaust pipe according to an embodiment of the present invention;

[0032] Figure 3 This is a schematic diagram of the metal ring of the exhaust pipe connection assembly according to an embodiment of the present invention;

[0033] Figure 4This is a cross-sectional view of the exhaust pipe connection assembly according to an embodiment of the present invention;

[0034] Figure 5 for Figure 4 A magnified view of part I;

[0035] Figure 6 This is an exploded structural diagram of the exhaust pipe according to an embodiment of the present invention;

[0036] Figure 7 This is a partial cross-sectional view of the exhaust pipe and metal ring according to an embodiment of the present invention;

[0037] Figure 8 This is a partial cross-sectional view of the smoke exhaust pipe and air outlet hood according to an embodiment of the present invention;

[0038] Figure 9 This is a schematic diagram illustrating the principle of folding the exhaust pipe and assembling the air outlet hood in an embodiment of the present invention. Detailed Implementation

[0039] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0040] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Since the embodiments disclosed in this invention can be arranged in different directions, these terms indicating direction are only for illustration and should not be regarded as limitations. For example, "upper" and "lower" are not necessarily limited to directions opposite to or consistent with the direction of gravity. In addition, features defined with "first" and "second" may explicitly or implicitly include one or more of such features.

[0041] See Figures 1-6 A smoke exhaust pipe connection assembly includes a smoke exhaust pipe 1 and an air outlet hood 2 connected to the smoke exhaust pipe 1.

[0042] The exhaust pipe 1 includes an aluminum foil tube 11 and steel wires 12 supporting the aluminum foil tube 11. The steel wires 12 are spirally distributed and located on the outer surface of the aluminum foil tube 11. When the exhaust pipe 1 is stretched, the aluminum foil tube 11 is arc-shaped between two adjacent turns of steel wires 12.

[0043] The air vent 2 includes a hollow hood 21 with openings at both ends. An annular groove 22 is formed on the top of the hood 21. The groove 22 is a downwardly recessed groove. The air vent 2 is usually made of plastic. Therefore, in this invention, a metal ring 3 is provided in the groove 22 and embedded in the annular groove 22 to resist deformation of the plastic part.

[0044] The metal ring 3 is preferably a steel ring, which includes a vertically extending body 31, a first flange 32 that bends radially inward from the top of the body 31, a second flange 33 that bends radially inward from the bottom of the body 31, and a third flange 34 that bends upward from the inner circumference of the second flange 33. In this embodiment, the fourth flange 34 is not annular, but has multiple flanges arranged at intervals along the circumference. The metal ring 3 configured as described above can increase strength to resist deformation.

[0045] The inner diameter of the first flange 32 is smaller than the diameter of the steel wire 12 (the diameter of the steel wire 12 is the diameter of its spirally coiled cylinder). During installation, the bottommost coil of the steel wire 12 of the exhaust pipe 1 is pressed into the metal ring 3 by an interference fit, positioning it between the first flange 32 and the second flange 33, thereby fixing the steel wire 12 and thus fixing the exhaust pipe 1. Furthermore, the portion of the metal ring 3 corresponding to the inserted steel wire 12 has at least one third flange 34 to prevent the steel wire 12 from detaching.

[0046] The exhaust pipe assembly also includes a pressure plate 4, which presses against the upper surface of the first flange 32 of the metal ring 3, securing it to the exhaust hood 2. Furthermore, the pressure plate 4 can be fixed to the exhaust hood 2 by screws 41. Two or more fixing points evenly distributed along the circumference can securely connect the exhaust hood 2 and the exhaust pipe 1. The fixing point refers to the combination of the pressure plate 4 and the screws 41.

[0047] See Figure 7 When the exhaust pipe 1 is pulled upwards, the pulling force F is decomposed into a horizontal inward force F2 and a vertical upward force F1 on the steel wire 12. The steel wire 12, embedded within the metal ring 3, is a complete circle. When compressed, the circle structure itself generates a radial force F3, where F3 > F2, preventing the steel wire 12 from detaching from the metal ring 3. The vertical force F1 is balanced by the downward pressure F4 provided by the pressure plate 4 on the metal ring 3.

[0048] To solve the sealing problem at the connection between the exhaust hood 2 and the smoke pipe 1, this invention utilizes the principle of communicating vessels. According to Pascal's principle, under atmospheric pressure, the pressure at the bottom of communicating vessels is equal. If pressure is applied to one side of the communicating vessel, the pressure will be transmitted and raise the liquid level on the other side. This principle is applied in this invention; see [link to relevant documentation]. Figure 8After the exhaust pipe 1 is inserted into the groove 22 of the exhaust hood 2, the groove 22 is filled with liquid sealing material. Afterward, the exhaust pipe 1 effectively divides the groove 22 into two communicating vessels (inner and outer). Figure 8 The groove 22 shown is located on the left and right sides of the exhaust pipe 1. When the range hood is turned on, pressure F5 is generated in the exhaust pipe 1, which pushes down the liquid between the exhaust pipe 1 and the inner wall of the groove 22. The descending liquid is transferred through the bottom connection to the channel between the exhaust pipe and the outer wall of the groove 22, thus causing the outer side ( Figure 8 As shown on the right side, the liquid level rises, meaning the pressure energy is converted into the liquid's gravitational potential energy. Appropriate height of the groove 22 wall and the amount of sealing liquid are sufficient to ensure a reliable seal, preventing air and smoke leakage. However, in actual engineering, after the range hood is turned on, the air pressure inside the duct is high, increasing the height of the groove 22 wall of the exhaust hood 2 and the amount of sealing material increases the actual cost.

[0049] Therefore, the present invention solves this problem by employing a three-stage damping technique:

[0050] ① The sealing liquid is a sealing liquid with a viscosity greater than 100 mPa·s, such as silicone oil, which uses the viscosity of the liquid itself to achieve the effect of damping the air pressure in the pipeline.

[0051] ② The metal ring 3 structure design is used to achieve the effect of damping the duct air pressure: For details, see Figure 5 The first flange 32 of the metal ring 3 has a recessed cut 321 extending from the inside out. This cut 321 serves as a flow channel for the liquid sealing material, ensuring that the metal ring 3 is completely submerged in the liquid sealing material. Under normal circumstances, without the metal ring 3 and the first flange 32, the air pressure inside the exhaust pipe 1 forces the liquid in the inner channel of the exhaust pipe 1 downwards, leaving only atmospheric pressure on the outer side, which would cause the outer liquid level to rise significantly. However, with the addition of the first flange 32, the same inner air pressure results in a significantly reduced outer outlet area. The first flange 32 hinders the rise of the outer liquid level, achieving a damping effect.

[0052] ③ Utilizing the foldable feature of exhaust pipe 1, damping pipe pressure is designed: See also Figure 8During normal assembly, the horizontal distance from the inner wall of the groove 22 of the exhaust hood 2 to the inner wall of the aluminum foil tube 11 of the exhaust pipe 1 is H. In this embodiment, the two adjacent steel wires 12 at the bottom of the exhaust pipe 1 are at least partially pressed into the metal ring 3, and the aluminum foil tube 11 between the two steel wires 12 is folded towards the inner wall of the groove 22. At this time, the horizontal distance from the inner wall of the groove 22 of the exhaust hood 2 to the inner wall of the aluminum foil tube 11 of the exhaust pipe 1 is h. The inward folding part is equivalent to reducing the communication area inside the communicating vessel. With the same pipe pressure F5, the same amount of sealing liquid, and the same flange resistance of the metal ring 3, the reduction of the inner contact area further weakens the conversion of the kinetic energy of the pipe air pressure into the potential energy of the outer liquid rise, further achieving the purpose of damping and pressure reduction.

Claims

1. A smoke exhaust pipe connection assembly, comprising a smoke exhaust pipe (1) and an exhaust hood (2) connected to the smoke exhaust pipe (1), wherein the exhaust hood (2) comprises a hood (21) that is open at both ends and is hollow, and an annular groove (22) is formed on the top of the hood (21), and the smoke exhaust pipe (1) is connected to the groove (22); Its features are: The exhaust pipe (1) includes an aluminum foil tube (11) and steel wires (12) supporting the aluminum foil tube (11), the steel wires (12) being spirally distributed; A metal ring (3) is embedded in the groove (22). The metal ring (3) includes a body (31) extending vertically, a first flange (32) bent inward from the top of the body (31), and a second flange (33) bent inward from the bottom of the body (31). The inner diameter of the first flange (32) is smaller than the diameter of the steel wire (12). At least the bottommost part of the exhaust pipe (1) is pressed into the metal ring (3) and located between the first flange (32) and the second flange (33).

2. The exhaust pipe connection assembly according to claim 1, characterized in that: The metal ring (3) also includes a third flange (34) that is bent upward from the inner circumference of the second flange (33). At least one third flange (34) exists in the part of the metal ring (3) corresponding to the inserted steel wire (12).

3. The exhaust pipe connection assembly according to claim 1, characterized in that: The exhaust pipe connection assembly also includes a pressure plate (4), which is pressed against the upper surface of the first flange (32) of the metal ring (3).

4. The exhaust pipe connection assembly according to claim 3, characterized in that: The pressure plate (4) is also fixed to the air outlet hood (2) by screws (41), and at least two fixing points for fixing by screws (41) are evenly distributed along the circumference of the air outlet hood (2).

5. The exhaust pipe connection assembly according to any one of claims 1 to 4, characterized in that: The groove (22) is filled with sealing liquid, and the bottom of the exhaust pipe (1) extends into the sealing liquid.

6. The exhaust pipe connection assembly according to claim 5, characterized in that: The sealing liquid is a liquid with a viscosity greater than 100 mPa·s.

7. The exhaust pipe connection assembly according to claim 5, characterized in that: The first flange (32) of the metal ring (3) has a recessed cut (321) from the inside out.

8. The exhaust pipe connection assembly according to claim 5, characterized in that: The bottom two adjacent steel wires (12) of the exhaust pipe (1) are at least partially pressed into the metal ring (3), and the aluminum foil tube (11) between the two steel wires (12) is folded toward the inner wall of the groove (22).

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