Adapter structure for air outlet cover, design method of the adapter structure and air outlet cover assembly

Abstract

The application relates to an adapter structure for an air outlet cover, a design method of the adapter structure and an air outlet cover assembly. The adapter structure for the air outlet cover comprises an adapter ring arranged at an air outlet of the air outlet cover and used for being connected with a smoke pipe. The adapter ring comprises an inner ring and an outer ring arranged at intervals between the inner ring and the outer ring. At least two first flanges arranged at intervals are arranged on the circumference of the inner ring. At least two second flanges arranged at intervals are arranged on the circumference of the outer ring. The first flanges extend along the axial direction of the inner ring. The second flanges extend along the axial direction of the outer ring. The first flanges and the second flanges are staggered with each other. The second flanges on the outer ring can exert inward pressure on the smoke pipe. The first flanges on the inner ring can exert outward tension on the smoke pipe. The second flanges and the first flanges on the adapter ring can be more evenly stressed, the installation stability of the smoke pipe is improved, and the smoke pipe is convenient to disassemble and assemble.

Description

Technical Field

[0001] This invention relates to the field of oil fume emission technology, and in particular to a transition structure for an exhaust hood, a design method for the transition structure, and an exhaust hood assembly. Background Technology

[0002] A range hood is a kitchen appliance used to purify the kitchen environment. The exhaust hood of a range hood has functions such as gathering and guiding airflow. The fumes enter the exhaust pipe through the exhaust hood and are then discharged through the exhaust pipe.

[0003] To achieve the connection between the air outlet hood and the exhaust pipe, Chinese utility model patent ZL 202021687894.3 (authorization announcement number CN 212805790U) discloses a convenient air outlet pipe installation structure for integrated stoves, including an integrated stove body, an air outlet hood, an adapter, and an air guide pipe. The air outlet hood includes an integrally connected conical tube body and a straight tube body. The straight tube body is fixed to the small end of the conical tube body. A first insertion ring groove is recessed in the peripheral wall of the straight tube body. An adapter sealing ring is filled in the first insertion ring groove. One end of the adapter is provided with a first insertion ring edge. Several L-shaped openings are evenly opened on the outer wall surface of the first insertion ring groove. The groove, L-groove, extends vertically to the top edge of the first insertion ring groove to form an opening. Several hooks are correspondingly provided on the outer wall of the first insertion ring groove. The first insertion ring groove is inserted into the first insertion ring groove and presses against the adapter sealing ring. The corresponding hooks enter the vertical groove of the L-groove through the opening. After the adapter is rotated, the hooks are embedded into the end of the horizontal groove of the L-groove. The other end of the adapter is provided with the second insertion ring groove. One end of the air guide pipe is inserted into the second insertion ring groove. The gap between the air guide pipe and the second insertion ring groove is filled with sealing adhesive.

[0004] Although the above-mentioned installation structure only requires screwing the adapter onto the air outlet cover, eliminating the cumbersome installation of fasteners such as clamps and improving installation efficiency, this installation structure has the following limitations: This installation structure requires filling the gap between the air duct and the second insertion ring groove with sealing adhesive. Due to the effect of the sealing adhesive, the installation stability of the air duct and the adapter is maintained, which makes the air duct inconvenient to disassemble. Therefore, further improvements to the existing technology are needed. Summary of the Invention

[0005] The first technical problem to be solved by the present invention is to provide a transition structure for an exhaust hood that can improve the installation stability of the flue and facilitate disassembly and assembly, in light of the above-mentioned prior art.

[0006] The second technical problem to be solved by the present invention is to provide a design method for the adapter structure as described above.

[0007] The third technical problem to be solved by the present invention is to provide an air outlet hood assembly with the above-described adapter structure.

[0008] The technical solution adopted by the present invention to solve the first technical problem mentioned above is: a transition structure for an air outlet hood, comprising:

[0009] An adapter ring is located at the air outlet of the air outlet hood and is used to connect to the smoke pipe;

[0010] The feature is that the adapter ring includes an inner ring and an outer ring arranged at intervals, the flue is disposed between the inner ring and the outer ring, the inner ring has at least two spaced first flanges in the circumferential direction, the outer ring has at least two spaced second flanges in the circumferential direction, the first flanges extend along the axial direction of the inner ring, the second flanges extend along the axial direction of the outer ring, and the first flanges and the second flanges are staggered from each other.

[0011] By applying inward pressure to the flue pipe through the second flange on the outer ring and applying outward tension to the flue pipe through the first flange on the inner ring, the force on the second flange and the first flange on the adapter ring can be more evenly distributed, thus improving the installation stability of the flue pipe.

[0012] Preferably, both the inner and outer rings have elliptical cross-sections. This allows the flue to elastically deform and connect with the elliptical air outlet hood without changing the flue diameter. The elliptical air outlet of the hood allows it to become thinner in the front-to-back direction, thus meeting the installation requirements of ultra-thin range hoods.

[0013] Preferably, there are two first flanges and two second flanges, with the two first flanges arranged opposite each other and the two second flanges arranged opposite each other.

[0014] The technical solution adopted by the present invention to solve the second technical problem mentioned above is: a design method for a transition structure for an air outlet hood as described above, characterized in that it includes a design method for a second flange on the outer ring, specifically:

[0015] Establish a coordinate system with the center of the outer circle as the origin, the major semi-axis of the outer circle as the X-axis, and the minor semi-axis of the outer circle as the Y-axis;

[0016] The flue tube deforms into an ellipse under the action of external force, and the deformation amount ΔX in the direction of the major axis and the deformation amount ΔY in the direction of the minor axis are obtained;

[0017] Based on Equations 1 and 2, the first intersection point is calculated. Then, the second flange on the outer ring within the first intersection point is retained, and the second flange outside the first intersection point is cut off.

[0018] Equation 1:

[0019] Equation 2:

[0020] Where x is the abscissa of the coordinate system, y is the ordinate of the coordinate system, a1 is the length of the major semi-axis of the outer ring, and b1 is the length of the minor semi-axis of the outer ring.

[0021] Preferably, the formula for calculating ΔX is:

[0022] ΔX=K*(Δσ*h*(D 2 -d 2 )) / (4*E*D*d)

[0023] Where K is the empirical correction coefficient, Δσ is the applied static pressure difference, h is the connection length between the flue and the adapter ring, D is the outer diameter of the flue, d is the inner diameter of the flue, and E is the elastic modulus of the flue material.

[0024] Preferably, the method for obtaining ΔY is as follows:

[0025] The perimeter C2 of the ellipse formed by the smoke pipe under the action of external force is equal to the original perimeter C1 of the smoke pipe;

[0026] The formula for calculating C2 is:

[0027]

[0028] Where θ is the integration variable;

[0029] The formula for calculating C1 is: C2 = πD 2 / 4, where D is the diameter of the exhaust pipe, and D is a known value;

[0030] According to ΔY is calculated.

[0031] The inner and outer rings are arranged concentrically.

[0032] To prevent interference between the inner edge of the flue and the first flange on the inner ring when the flue is excessively compressed, thus causing assembly difficulties, the design method also includes a design method for the first flange on the inner ring, specifically:

[0033] The second intersection point is calculated based on equations 2 and 3. The first flange on the inner ring inside the second intersection point is retained, and the first flange outside the second intersection point is cut off.

[0034] Equation 3:

[0035] Where a2 is the length of the major semi-axis of the inner ring; b2 is the length of the minor semi-axis of the inner ring.

[0036] The technical solution adopted by the present invention to solve the third technical problem mentioned above is: an air outlet hood assembly, including an air outlet hood and a connecting structure installed at the air outlet of the air outlet hood, characterized in that: the connecting structure adopts the connecting structure described above.

[0037] To enable the installation of the adapter structure, the air outlet cover has a peripheral wall spaced at intervals on the outside of the air outlet of the air outlet cover, and a groove is formed between the peripheral wall and the air outlet cover. The adapter ring has a protrusion on the end face opposite to the inner ring and the outer ring that can be inserted into the groove.

[0038] Compared with the prior art, the advantages of the present invention are as follows: by setting an inner ring and an outer ring arranged at intervals, the inner ring has at least two spaced first flanges in the circumferential direction, and the outer ring has at least two spaced second flanges in the circumferential direction, and the first flanges and second flanges are staggered from each other, so the second flanges on the outer ring can be used to apply inward pressure to the flue pipe, and the first flanges on the inner ring can be used to apply outward tension to the flue pipe, thereby making the second flanges and first flanges on the transition ring more evenly distributed, improving the installation stability of the flue pipe, and making the flue pipe easy to install and disassemble. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of the air outlet shroud assembly in an embodiment of the present invention;

[0040] Figure 2 for Figure 1 Exploded view;

[0041] Figure 3 for Figure 1 A sectional view. Detailed Implementation

[0042] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0043] like Figures 1-3 As shown, the exhaust hood assembly in this embodiment includes an exhaust hood 2 and a connecting structure. The exhaust hood 2 has an exhaust port 21 and an exhaust port 23. The connecting structure is installed on the exhaust port 21 of the exhaust hood 2. In this embodiment, the exhaust port 21 of the exhaust hood 2 has an elliptical cross-section, which makes the exhaust port of the exhaust hood 2 thinner in the short axis direction. Utilizing the existing flue pipe's elasticity (the existing flue pipe is a corrugated pipe), it can be compressed into an elliptical shape for connection, thus meeting the installation requirements of an ultra-thin range hood without replacing the flue pipe. To make the exhaust hood versatile, the exhaust port 23 of the exhaust hood 2 has a rectangular cross-section, and the exhaust port 23 of the exhaust hood 2 connects to the volute outlet of the range hood.

[0044] The transition structure includes a transition ring 1, which is located at the air outlet 21 of the air outlet hood 2 and is used to connect to the flue pipe. The transition ring 1 includes an inner ring 11 and an outer ring 12 arranged at intervals. In this embodiment, the inner ring 11 and the outer ring 12 are arranged concentrically, and the flue pipe is located between the inner ring 11 and the outer ring 12. Figure 2 and Figure 3As shown, in this embodiment, the air outlet hood 2 has a peripheral wall 22 arranged at intervals on the outside of the air outlet 21 of the air outlet hood 2. A groove 220 is formed between the peripheral wall 22 and the air outlet hood 2. The adapter ring 1 has a protrusion 13 on the end face that is opposite to the inner ring 11 and the outer ring 12, which can be inserted into the groove 220.

[0045] like Figure 2 and Figure 3 As shown, in this embodiment, the inner ring 11 has at least two spaced-apart first flanges 111 in the circumferential direction, and the outer ring 12 has at least two spaced-apart second flanges 121 in the circumferential direction. The first flanges 111 extend along the axial direction of the inner ring 11, and the second flanges 121 extend along the axial direction of the outer ring 12, and the first flanges 111 and the second flanges 121 are staggered. Figure 2 As shown, in this embodiment, the cross-sections of both the inner ring 11 and the outer ring 12 are elliptical. Furthermore, there are two first flanges 111 and two second flanges 121, with the two first flanges 111 and the two second flanges 121 arranged opposite each other. The second flange 121 on the outer ring 12 applies inward pressure to the flue, while the first flange 111 on the inner ring 11 applies outward tension to the flue. This allows the forces on the second flange 121 and the first flange 111 on the transition ring 1 to be more evenly distributed, improving the stability of the structure. Moreover, the position of the second flange 121 can be determined by the cross-section of the outer ring 12 and the flue, and the position of the first flange 111 can be determined by the cross-section of the inner ring 11 and the flue.

[0046] The flue tube must first be extruded and deformed into an accurately shaped ellipse before it can be fitted into the adapter ring, significantly increasing the assembly difficulty. Insufficient extrusion causes the outer edge of the flue tube to interfere with the second flange 121, while excessive extrusion causes the inner edge to interfere with the first flange 111, making assembly extremely difficult. To solve this technical problem, the interference can be avoided by cutting away the easily interfering parts of the second flange 121 and the first flange 111. However, excessive cutting results in a small contact area, increased stress on the material, and reduced structural reliability; insufficient cutting, on the other hand, fails to effectively reduce assembly difficulty. Therefore, the technical problem arising in this embodiment is: how to rationally design the positions of the second flange 121 and the first flange 111 to effectively reduce assembly difficulty while minimizing the amount of cutting and ensuring structural reliability.

[0047] In this embodiment, the design method of the transition structure includes a design method for the second flange 121 on the outer ring 12 and a design method for the first flange 111 on the inner ring 11. Specifically, the design method for the second flange 121 on the outer ring 12 is as follows:

[0048] Establish a coordinate system with the center of outer ring 12 as the origin, the major semi-axis of outer ring 12 as the X-axis, and the minor semi-axis of outer ring 12 as the Y-axis.

[0049] The flue tube deforms into an ellipse under the action of external force, and the deformation amount ΔX in the direction of the major axis and the deformation amount ΔY in the direction of the minor axis are obtained;

[0050] The first intersection point is calculated according to Equations 1 and 2. Then, the second flange 121 on the outer ring 12 within the first intersection point is retained, and the second flange 121 outside the first intersection point is cut off.

[0051] Equation 1:

[0052] Equation 2:

[0053] Where x is the abscissa of the coordinate system, y is the ordinate of the coordinate system, a1 is the length of the major semi-axis of the outer ring 12, and b1 is the length of the minor semi-axis of the outer ring 12.

[0054] Equation 1 above is the standard equation of the ellipse containing the outer ring 12, and Equation 2 is the standard equation of the ellipse produced by the inaccurate application of force to the flue.

[0055] Whether the flue pipe is assembled mechanically or manually, there will always be some fluctuation when force is applied. This fluctuation in force will cause fluctuations in the geometry of the flue pipe. The ends of corrugated flue pipes have special characteristics. At the joint, the flue pipe is in a contracted state. Therefore, the calculation of the compression deformation at the joint of the flue pipe can be transformed into the ring compression deformation problem of an elastic hollow cylinder that requires design correction. Assuming that the inner diameter of the elastic hollow cylindrical ring is d, the outer diameter is D, and the height is h, a pair of equivalent clamping stresses of magnitude σ are applied to both sides of the outer ring of the hollow cylinder. The ring deforms inward into an elliptical shape, and the deformation in the direction of its minor radius is X. According to the theory of elasticity, after the ring is clamped with a radial clamping stress σ, the deformation X in the direction of its minor radius can be calculated by the following formula:

[0056] X=K*(σ*h*(D 2 -d 2 ))) / (4*E*D*d)

[0057] Where K is an empirical correction coefficient and E is the elastic modulus of the flue material.

[0058] The derivation of this formula is quite complex, requiring the application of the strain energy formula of a ring and the principle of elastic energy, where E is the elastic modulus of the flue material, which depends on the material of the flue selected.

[0059] D is the outer diameter of the flue pipe and d is the inner diameter of the flue pipe, depending on the geometric parameters of the selected flue pipe.

[0060] h represents the length of the transition section. Based on experience, the length of the connection between the flue and the adapter ring is usually 30-50mm.

[0061] K is an empirical correction coefficient used to correct the calculation deviation caused by the difference between the flue and the simple hollow ring structure. It is usually taken as 1.5 to 3.

[0062] Taking manual assembly as an example, when applying stress, the human hand struggles to precisely control the pressure range due to muscle tremors and instability in nerve control. According to relevant experimental data, the pressure error of static force applied by the human hand is generally around 100-500 Pascals (Pa). This error range is affected by various factors, such as the hand muscles used, the direction and location of the applied force, and the magnitude of the applied force. Therefore, in this design, a pressure difference of ±1000 Pa is used, Δσ = 1000 Pa. The deformation ΔX along the long axis of the flue is then:

[0063] ΔX=K*(Δσ*h*(D 2 -d 2 )) / (4*E*D*d)

[0064] Since the circumference of the flue pipe can be approximated as constant after extrusion, the deformation ΔY along the minor axis of the flue pipe is obtained as follows:

[0065] The perimeter C2 of the ellipse formed by the smoke pipe under the action of external force is equal to the original perimeter C1 of the smoke pipe;

[0066] The formula for calculating C2 is:

[0067]

[0068] Where θ is the integration variable;

[0069] The C2 is obtained as follows: C2 = 4(a1 + ΔX)E(e), where e is the eccentricity of the ellipse and E(e) is the elliptic integral of the second kind.

[0070] The formula for calculating C1 is: C2 = πD 2 / 4, where D is the diameter of the exhaust pipe, and D is a known value;

[0071] According to ΔY is calculated.

[0072] The design method of the first flange 111 on the inner ring 11 is as follows: the second intersection point is calculated according to equations 2 and 3, then the first flange 111 on the inner ring 11 within the second intersection point is retained, and the first flange 111 outside the second intersection point is cut off.

[0073] Equation 3:

[0074] Where a2 is the length of the major semi-axis of the inner circle 11; b2 is the length of the minor semi-axis of the inner circle 11; and equation 3 above is the standard equation of the ellipse containing the inner circle 11.

Claims

1. An adapter structure for an air outlet cover, comprising: an adapter ring (1) arranged at an air outlet (21) of the air outlet cover (2) for connecting with a flue pipe; characterized in that the adapter ring (1) comprises an inner ring (11) and an outer ring (12) arranged at intervals between the inner ring (11) and the outer ring (12), the flue pipe is arranged between the inner ring (11) and the outer ring (12), at least two first flanges (111) are arranged at intervals in the circumferential direction of the inner ring (11), at least two second flanges (121) are arranged at intervals in the circumferential direction of the outer ring (12), the first flanges (111) extend along the axial direction of the inner ring (11), the second flanges (121) extend along the axial direction of the outer ring (12), and the first flanges (111) and the second flanges (121) are staggered with each other.

2. The adapter structure of claim 1, wherein: The inner ring (11) and the outer ring (12) are both in the shape of an ellipse in cross section.

3. The adapter structure of claim 2, wherein: The first flanges (111) and the second flanges (121) are both two, the two first flanges (111) are arranged opposite to each other, and the two second flanges (121) are arranged opposite to each other.

4. A method of designing an adapter structure for an air outlet cover according to any one of claims 1 to 3, characterized in that The design method of the second flanges (121) on the outer ring (12) comprises the following steps: a coordinate system is established with the center of the outer ring (12) as the origin and the long semi-axis of the outer ring (12) as the X-axis and the short semi-axis of the outer ring (12) as the Y-axis; the flue pipe is deformed into an ellipse under the action of an external force, and the deformation amount ΔX in the long axis direction and the deformation amount ΔY in the short axis direction of the flue pipe are obtained; and the first intersection point is calculated according to equation 1 and equation 2, then the second flanges (121) on the outer ring (12) within the first intersection point are retained, and the second flanges (121) outside the first intersection point are cut off; Equation 1: Equation 2: wherein x is the horizontal coordinate in the coordinate system, y is the vertical coordinate in the coordinate system, a1 is the length of the long semi-axis of the outer ring (12), and b1 is the length of the short semi-axis of the outer ring (12).

5. The method of claim 4, wherein: The calculation formula of ΔX is: ΔX = K * (Δσ * h * (D 2 - d 2 )) / (4 * E * D * d) wherein K is an empirical correction coefficient, Δσ is the applied static force pressure difference, h is the length of the flue pipe and the adapter ring (1), D is the outer diameter of the flue pipe, d is the inner diameter of the flue pipe, and E is the elastic modulus of the flue pipe material.

6. The method of designing according to claim 5, characterized in that: The ΔY is obtained in the following manner: the circumference C2 of the ellipse formed by the flue pipe under the action of the external force is equal to the original circumference C1 of the flue pipe; The calculation formula of C2 is: wherein θ is the integral variable; The calculation formula of C1 is: C2=πD 2 / 4, D is the diameter of the smoke exhaust duct, and D is a known value. That is, ΔY is calculated according to ΔY = 0.5 * (Y - Y0) 7. The method of claim 4, wherein: The inner ring (11) and the outer ring (12) are arranged concentrically.

8. The method of designing according to claim 7, characterized in that: The design method of the first flanges (111) on the inner ring (11) comprises the following steps: the second intersection point is calculated according to equation 2 and equation 3, then the first flanges (111) on the inner ring (11) within the second intersection point are retained, and the first flanges (111) outside the second intersection point are cut off; Equation 3: wherein a2 is the length of the long semi-axis of the inner ring (11), and b2 is the length of the short semi-axis of the inner ring (11).

9. An air outlet cover assembly comprising an air outlet cover (2) and an adapter structure mounted at an air outlet opening (21) of the air outlet cover (2), characterized in that: The adapter structure adopts the adapter structure according to any one of claims 1-3.

10. The air deflector assembly of claim 9, wherein: The air outlet cover (2) has a peripheral wall (22) arranged at intervals outside the air outlet (21) of the air outlet cover (2), and a groove (220) is formed between the peripheral wall (22) and the air outlet cover (2). The adapter ring (1) has a protrusion (13) on the end face opposite to the inner ring (11) and the outer ring (12), which can be inserted into the groove (220).

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