Smoke exhaust pipe connecting assembly

Abstract

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

Description

Technical Field

[0001] The invention relates to an oil fume purification device, in particular to a fume exhaust pipe connecting assembly. Background Art

[0002] The exhaust pipe and the connecting piece of the existing range hood are all connected in a flexible manner, and aluminum foil tape is generally used to fix the exhaust pipe to the connecting piece.

[0003] For example, the Chinese invention patent application number 201720895177.1 discloses a smoke exhaust pipe variable diameter adapter seat structure, which includes a connector and an adapter body. The connector is arranged on the top surface of the adapter body, and a through hole for oil smoke circulation is provided through the connector and the adapter body. The connector includes an upper connection part, a middle connection part and a lower connection part. The upper connection part includes an inner ring on the connector and an outer ring on the connector. A first gap groove for clamping an aluminum foil tube is formed between the inner ring on the connector and the outer ring on the connector. The aluminum foil tube is clamped in the first gap groove, and aluminum foil tape is bonded between the outer ring on the connector and the aluminum foil tube.

[0004] The existing smoke pipe assembly has the following problems:

[0005] ① The wall thickness of the plastic air hood is 1 to 2 mm. Due to the expansion and contraction caused by mold precision and ambient temperature, as well as the strong pulling of the installer when sticking the tape, the circular air hood will be deformed. If the clearance between the air hood and the smoke pipe is insufficient, installation will be difficult.

[0006] ② The connection surface between the exhaust pipe and the connector is not flat but rather irregularly shaped. Wrinkles and gaps may form when the adhesive tape is wrapped around the exhaust pipe. Wind pressure at the exhaust pipe causes the tape to vibrate continuously. Over time, this can cause the tape and the exhaust pipe to separate, leading to smoke and oil leaks.

[0007] ③ The air outlet cover is a plastic part with a certain hardness, while the smoke pipe is a soft part. When bonding the 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 have wind pressure driving the external adhesive tape to vibrate continuously. Over time, the external adhesive tape and the flue will fall off, causing smoke and oil leakage;

[0009] ⑤ The screw passing through the aluminum foil flue hole will expand up and down, and cannot effectively fix the flue pipe and the air outlet cover. In addition, the punctured hole will become an oil leakage 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 to reduce the deformation of the air outlet hood in response to the problems existing in the above-mentioned prior art.

[0011] The second technical problem to be solved by the present invention is to provide a smoke exhaust pipe connection assembly to solve the problems existing in the above-mentioned prior art, which can ensure the smoke exhaust pipe connection is tight.

[0012] The third technical problem to be solved by the present invention is to provide a smoke exhaust pipe connection assembly to improve the sealing performance of the connection between the smoke exhaust pipe and the air outlet hood in response to the problems existing in the above-mentioned 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 cover connected to the smoke exhaust pipe, the air outlet cover including a hollow cover body with two ends open, an annular groove formed on the top of the cover body, and the smoke exhaust pipe connected to the groove;

[0014] Its characteristics are:

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

[0016] By embedding a metal ring to fix the inner ring wall of the air outlet cover, the strength of the metal is used to limit the dimensional deformation of the assembly position, so as to achieve the purpose of easily installing the exhaust pipe.

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

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

[0019] Thus, the steel wire of the smoke exhaust pipe is pressed into the metal ring by means of interference fit and physical extrusion to achieve the purpose of firm fixation.

[0020] Furthermore, in order to prevent the steel wire from escaping from the metal ring, the metal ring further includes a third flange bent upward from the inner circumference of the second flange. There is at least one third flange on the portion of the metal ring corresponding to the inserted steel wire.

[0021] Furthermore, the smoke exhaust pipe connection assembly further comprises a pressing plate, which is pressed tightly against the upper surface of the first flange of the metal ring, thereby balancing the force on the steel wire and further preventing the steel wire from falling off 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 screw fixing points 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: the groove is filled with a sealing liquid, and the bottom of the smoke exhaust pipe extends into the sealing liquid.

[0024] By filling the sealing liquid and utilizing the principle of communicating vessels, when the range hood is turned on, the pressure in the exhaust pipe will press down the liquid between the exhaust pipe and the inner wall of the groove. The descending liquid is transferred to the channel between the exhaust pipe and the outer wall of the groove through the bottom connection, thereby causing the liquid level on the outside to rise, achieving a reliable seal without air or 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 wind pressure in the pipeline.

[0026] Furthermore, the first flange of the metal ring is formed with a cutout that is recessed from the inside to the outside, and the sealing liquid can flow through the cutout. This cutout channel can ensure that the metal ring can be completely immersed in the liquid sealing material.

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

[0028] Compared with conventional smoke exhaust pipes, the inward folding between the two circles of steel wire is equivalent to reducing the connecting area inside the communicating vessel. With the same pipeline pressure, the same amount of sealing liquid, and the same metal ring flanging resistance, the reduction in the inner contact area further weakens the kinetic energy of the pipeline wind pressure converted into the potential energy of the outer liquid lifting, further achieving the purpose of damping and pressure reduction.

[0029] Compared with the existing technology, the advantages of the present invention are: by embedding a metal ring to fix the inner ring wall of the air outlet hood, the metal strength is used to limit the deformation of the assembly position size, so as to achieve the purpose of easily installing the smoke exhaust pipe; by using the interference fit physical extrusion method, the steel wire of the smoke exhaust pipe is pressed into the metal ring to achieve the purpose of firm fixation; by using sealing liquid, metal ring flange and inward fold of the smoke exhaust pipe, the kinetic energy of the wind pressure in the pipeline is weakened and converted into the potential energy of the lifting of the outer liquid, thereby achieving the purpose of damping and pressure reduction. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

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

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

[0034] Figure 5 for Figure 4 An enlarged view of a part I;

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

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

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

[0038] Figure 9 This is a schematic diagram of the folding of the smoke exhaust pipe and the assembly of the air outlet cover according to an embodiment of the present invention. DETAILED DESCRIPTION

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

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

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

[0042] The smoke exhaust pipe 1 includes an aluminum foil tube 11 and a steel wire 12 supporting the aluminum foil tube 11. The steel wire 12 is spirally distributed and located on the outer surface of the aluminum foil tube 11. When the smoke exhaust pipe 1 is stretched, the aluminum foil tube 11 is curved between two adjacent coils of the steel wire 12.

[0043] The air hood 2 includes a hollow housing 21 with two open ends. The top of the housing 21 is formed with an annular recess 22, which is a downwardly concave groove. The air hood 2 is typically made of plastic. Therefore, in the present invention, a metal ring 3 is provided within the recess 22 to prevent deformation of the plastic.

[0044] The metal ring 3 is preferably a steel ring and includes a body 31 extending vertically, a first flange 32 bent radially inward from the top of the body 31, a second flange 33 bent radially inward from the bottom of the body 31, and a third flange 34 bent upward from the inner circumference of the second flange 33. In this embodiment, the fourth flange 34 is not annular, but rather comprises multiple flanges spaced apart along the circumference. This arrangement of the metal ring 3 increases 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 the cylinder in which it is spirally wound). During installation, the bottom loop of the steel wire 12 of the smoke exhaust pipe 1 is pressed into the metal ring 3 through an interference fit, so that it is located between the first flange 32 and the second flange 33, thereby securing the steel wire 12 and, in turn, the smoke exhaust pipe 1. The metal ring 3 also has at least one third flange 34 on the portion corresponding to the inserted steel wire 12 to prevent the steel wire 12 from escaping.

[0046] The exhaust duct assembly also includes a pressure plate 4, which presses against the upper surface of the first flange 32 of the metal ring 3, thereby clamping it to the air hood 2. Furthermore, the pressure plate 4 is secured to the air hood 2 via screws 41. Two or more fixing points evenly distributed along the circumference can secure the air hood 2 and the exhaust duct 1. The fixing points refer to the combination of the pressure plate 4 and the screws 41.

[0047] See also Figure 7 When the exhaust pipe 1 is pulled upward, the pulling force F is split on the steel wire 12 into a horizontal inward force F2 and a vertical upward force F1. The steel wire 12, embedded in the metal ring 3, is a complete circle. When compressed, the circular structure itself generates a radial force F3, which is greater than F2, preventing the steel wire 12 from separating from the metal ring 3. The vertical force F1 is balanced by the downward force F4 provided by the pressure plate 4 on the metal ring 3.

[0048] In order to solve the problem of sealing the gap at the connection between the air hood 2 and the smoke exhaust pipe 1, the present invention uses the communicating vessel principle. According to the Pascal principle of communicating vessels, under the action of atmospheric pressure, the pressure at the bottom of the communicating vessel is equal. If pressure is applied to one side of the communicating vessel, the pressure transmission pressure will raise the liquid level on the other side. This principle is applied in the present invention, see Figure 8After the exhaust pipe 1 is inserted into the groove 22 of the air hood 2, the groove 22 is filled with liquid sealing material. After that, the exhaust pipe 1 actually divides the groove 22 into two communicating vessels ( Figure 8 The groove 22 shown in the figure is located on the left and right sides of the exhaust pipe 1). After the range hood is turned on, the exhaust pipe 1 will generate pressure F5, which will press down the liquid between the exhaust pipe 1 and the inner wall of the groove 22. The descending liquid is transferred to the channel between the exhaust pipe and the outer wall of the groove 22 through the bottom connection, thereby causing the outer side ( Figure 8 The liquid level rises (as shown on the right side of the figure), which means that the pressure energy is converted into the gravitational potential energy of the liquid. A suitable wall height of groove 22 and the amount of sealing liquid ensure a reliable seal that prevents air and smoke leakage. However, in actual projects, when the range hood is turned on and running, the wind pressure in the flue is high. Increasing the wall height of groove 22 in the air hood 2 and the amount of sealing material used increase the actual cost.

[0049] To this end, the present invention solves this problem by adopting three-stage damping technology:

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

[0051] ② Use the metal ring 3 structure design to achieve the effect of damping the pipe wind pressure: For details, see Figure 5 The first flange 32 of the metal ring 3 is formed with a recessed notch 321 extending from the inside out. This notch 321 serves as a flow channel for the liquid sealing material, ensuring that the metal ring 3 remains completely immersed within the liquid sealing material. Under normal circumstances, without the metal ring 3 and the first flange 32, the wind pressure within the exhaust pipe 1 pushes the liquid downward, leaving the liquid level outside at only atmospheric pressure, causing it to rise significantly. However, with the first flange 32, the outer outlet area is significantly reduced for the same internal wind pressure. The first flange 32 dampens the rise in the liquid level, thus achieving a damping effect.

[0052] ③ Using the foldable feature of the exhaust pipe 1 to design the damping pipe pressure: see Figure 8During normal assembly, the horizontal distance between the inner wall of the groove 22 of the air hood 2 and the inner wall of the aluminum foil tube 11 of the smoke exhaust pipe 1 is H. In this embodiment, two adjacent turns of steel wire 12 at the bottom of the smoke exhaust pipe 1 are at least partially pressed into the metal ring 3. The aluminum foil tube 11 between the two turns of steel wire 12 is folded toward the inner wall of the groove 22. At this point, the horizontal distance between the inner wall of the groove 22 of the air hood 2 and the inner wall of the aluminum foil tube 11 of the smoke exhaust pipe 1 is h. The inward fold is equivalent to reducing the connecting area inside the communicating vessel. With the same pipeline pressure F5, the same amount of sealing liquid, and the same flanging resistance of the metal ring 3, the reduced inner contact area further weakens the conversion of the kinetic energy of the pipeline wind pressure into the potential energy of the liquid rising outside, further achieving the purpose of damping and reducing pressure.

Claims

1. A smoke exhaust pipe connection assembly, comprising a smoke exhaust pipe (1) and an air outlet cover (2) connected to the smoke exhaust pipe (1), wherein the air outlet cover (2) comprises a cover body (21) with two ends open and hollow, an annular groove (22) being formed on the top of the cover body (21), and the smoke exhaust pipe (1) is connected to the groove (22); Its characteristics are: A metal ring (3) is embedded in the groove (22).

2. The smoke exhaust pipe connection assembly according to claim 1, characterized in that: The smoke exhaust pipe (1) comprises an aluminum foil tube (11) and a steel wire (12) supporting the aluminum foil tube (11), wherein the steel wire (12) is distributed in a spiral shape; The metal ring (3) includes a main body (31) extending up and down, a first flange (32) bent inward from the top of the main body (31), and a second flange (33) bent inward from the bottom of the main body (31), the inner diameter of the first flange (32) is smaller than the diameter of the steel wire (12), and at least a portion of the bottommost circle of the steel wire (12) of the smoke exhaust pipe (1) is pressed into the metal ring (3) and is located between the first flange (32) and the second flange (33).

3. The smoke exhaust pipe connection assembly according to claim 2, characterized in that: The metal ring (3) further comprises a third flange (34) bent upward from the inner circumference of the second flange (33). The portion of the metal ring (3) corresponding to the inserted steel wire (12) has at least one third flange (34).

4. The smoke exhaust pipe connection assembly according to claim 2, characterized in that: The smoke exhaust pipe connection assembly further comprises a pressing plate (4), wherein the pressing plate (4) is pressed tightly against the upper surface of the first flange (32) of the metal ring (3).

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

6. The smoke exhaust pipe connection assembly according to any one of claims 2 to 5, characterized in that: The groove (22) is filled with a sealing liquid, and the bottom of the smoke exhaust pipe (1) extends into the sealing liquid.

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

8. The smoke exhaust pipe connection assembly according to claim 6, characterized in that: The first flange (32) of the metal ring (3) is formed with a notch (321) that is recessed from the inside to the outside.

9. The smoke exhaust pipe connection assembly according to claim 6, characterized in that: Two adjacent circles of steel wire (12) at the bottom of the smoke exhaust pipe (1) are at least partially pressed into the metal ring (3), and the aluminum foil tube (11) between the two circles of steel wire (12) is folded toward the inner wall of the groove (22).

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