A fume extraction duct system and a range hood including the fume extraction duct system.

Abstract

This application relates to a fume extraction duct system and a range hood incorporating the system. The fume extraction duct system includes at least two types of ducts with different hardnesses: a first-hardness duct and a second-hardness duct, with the first-hardness duct being less than the second-hardness duct. The first-hardness duct is located upstream of the second-hardness duct, following the direction of fume emission. Using hard ducts instead of traditional aluminum foil ducts extends the duct's service life. Simultaneously, the smooth surface of the hard duct reduces wind resistance, noise, and airflow loss. A combination of flexible hoses in certain areas allows for duct adjustment, and the use of flexible hoses upstream facilitates connection with the range hood's exhaust hood interface, reducing installation difficulty. The added limiting structure on the stainless steel straight duct effectively prevents the two ducts from detaching during pulling, improving installation stability. The added folded edge structure on the stainless steel duct avoids sharp edges that could cut hands. The multi-section stainless steel duct connection method can adapt to different installation conditions.

Description

Technical Field

[0001] This application relates to the field of kitchen appliance technology, specifically to an exhaust duct system and a range hood including the exhaust duct system. Background Technology

[0002] Currently, the use of flue pipes in range hoods and other similar smoke extraction equipment varies. Range hoods often use aluminum foil flue pipes, while products like gas water heaters use smaller diameter stainless steel flue pipes.

[0003] Aluminum foil flue pipes have several drawbacks. They are prone to aging and cracking, resulting in a short lifespan. For users with enclosed ceilings, replacing aluminum foil flue pipes is extremely inconvenient. Furthermore, the rough surface of aluminum foil flue pipes creates significant air resistance, leading to increased noise and airflow loss, greatly impacting the user experience when using the range hood.

[0004] Some products also have shortcomings with the stainless steel flue pipes they use. Solid stainless steel flue pipes are difficult to install, sometimes requiring cutting, and demand a high level of skill from installation technicians. Telescopic stainless steel flue pipes lack a limit structure when pulled out, making them prone to detachment. Furthermore, the edges of stainless steel flue pipes are sharp, easily cutting the hands of installers. Utility Model Content

[0005] The first technical problem this patent aims to solve is to overcome the issues of easy aging and cracking of pipeline systems in existing technologies. This patent also aims to solve the problems of high noise, large air volume loss, poor installation and adjustment, and poor compatibility with the range hood exhaust hood interface.

[0006] The technical solution adopted by this patent to solve the first technical problem is:

[0007] The exhaust pipe system of this patent includes at least two types of exhaust pipes with different hardness: a first hardness exhaust pipe and a second hardness exhaust pipe. The first hardness is less than the second hardness. According to the direction of exhaust, the first hardness exhaust pipe is located upstream of the second hardness exhaust pipe.

[0008] The technical solution adopted by this patent to solve the second technical problem is:

[0009] Furthermore, the exhaust system has an exhaust hood, and one end of the first hardened exhaust pipe is connected to the exhaust hood.

[0010] Furthermore, the exhaust system has an elbow, with the front end of the elbow connected to a first-hardness exhaust pipe and the rear end of the elbow connected to a second-hardness exhaust pipe.

[0011] Furthermore, the hardness of the elbow is roughly the same as or the material is roughly the same as that of the second-hardness flue.

[0012] Furthermore, the rear end of the elbow has a constriction tube that is inserted into the second-hardness smoke tube, and the diameter of the constriction tube gradually decreases on the side closest to the second-hardness smoke tube.

[0013] Furthermore, the rear end of the elbow has a constriction tube, which is inserted into the second hardness smoke tube. The side of the constriction tube away from the second hardness smoke tube forms an annular limiting platform with the elbow.

[0014] Furthermore, the end of the constricted tube has a flange.

[0015] Furthermore, the second-hardness smoke tube includes a first straight tube and a second straight tube. The outer diameter of the first straight tube is not greater than the inner diameter of the second straight tube. The front end of the first straight tube is inserted into the front end of the second straight tube and extends out through the rear end of the second straight tube.

[0016] Furthermore, the rear ends of the first straight pipe and the rear ends of the second straight pipe have matching limiting ribs.

[0017] Furthermore, the limiting ribs are the first limiting rib located on the outer wall of the first straight pipe and the second limiting rib located on the inner wall of the second straight pipe.

[0018] Furthermore, the rear end of the first straight tube has an inward flange, and the rear end of the second straight tube has an outward flange.

[0019] Furthermore, the front end of the second straight pipe is connected to a check valve, and the rear end of the second straight pipe is also provided with several first straight pipes and second straight pipes, with the first straight pipes and second straight pipes spaced apart.

[0020] Furthermore, the outer diameter of the annular limiting platform is between the outer diameter of the first straight tube and the inner diameter of the second straight tube.

[0021] Furthermore, in this patent, the first hardness smoke tube is an aluminum foil smoke tube, and the second hardness smoke tube is a stainless steel smoke tube.

[0022] The positive and progressive effects of this patent are as follows:

[0023] The main body of the smoke exhaust system uses rigid pipes instead of traditional aluminum foil smoke pipes, avoiding the problems of easy aging and cracking of aluminum foil smoke pipes and extending the service life of the smoke pipes. At the same time, the smooth surface of the rigid pipes reduces wind resistance, decreases noise and airflow loss, and improves the user experience. A combination scheme using flexible hoses in certain areas makes the smoke pipes adjustable, and the use of flexible hoses at the upstream end facilitates connection with the range hood's exhaust hood interface, reducing installation difficulty. The added limiting structure of the stainless steel straight pipes effectively prevents the two pipes from detaching during pulling, improving installation stability. The added folded edge structure of the stainless steel smoke pipes avoids the problem of sharp edges cutting hands, ensuring the safety of installers. The multi-section stainless steel smoke pipe connection method can adapt to different installation conditions, improving the product's applicability. Attached Figure Description

[0024] Figure 1 This is a diagram of the smoke extraction system in Embodiment 1 of this patent;

[0025] Figure 2 This is a cross-sectional view at point I in Embodiment 1 of this patent;

[0026] Figure 3 This is a cross-sectional view at point II of Embodiment 1 of this patent;

[0027] Figure 4 This is a cross-sectional view at point III of Embodiment 1 of this patent;

[0028] Figure 5 This is a diagram of the smoke extraction system in Embodiment 5 of this patent;

[0029] Figure 6 This is a side sectional view of Embodiment 5 of this patent;

[0030] Figure 7 This is a diagram of the smoke extraction system in Embodiment 6 of this patent;

[0031] Figure 8 This is a side sectional view of Embodiment 6 of this patent. Detailed Implementation

[0032] The present patent is further illustrated below by way of embodiments, but this does not limit the present patent to the scope of the embodiments described.

[0033] Example 1: As Figure 1 As shown, the flue pipe is installed between the range hood exhaust hood 9 and the check valve 10. This flue pipe consists of an elbow 4, a first straight pipe 21, a second straight pipe 22, and a first rigid flue pipe 1. The elbow, first straight pipe 21, and second straight pipe 22 are rigid pipes, while the first rigid flue pipe 1 is a flexible pipe, employing a combination of rigid and flexible pipes. In this embodiment, the first rigid flue pipe is an aluminum foil flue pipe. To further ensure the stability of the exhaust pipe system, the first rigid flue pipe uses a denser aluminum foil flue pipe.

[0034] like Figure 2 As shown, the stainless steel elbow has a corresponding constriction structure, which facilitates the insertion of the second hardness flue pipe. Specifically, there is a constriction pipe 5 at the rear end of the elbow. The constriction pipe 5 is inserted into the first straight pipe 21, and the diameter of the constriction pipe 5 gradually decreases on the side closer to the first straight pipe 21.

[0035] like Figure 3 As shown, the outer wall of the rear end of the first straight pipe 21 has a first limiting rib 81, and the inner wall of the rear end of the second straight pipe 22 has a second limiting rib 82. The two work together to limit the movement and solve the problem of the two straight pipes falling off due to excessive pulling force during installation. Since it is installed on the ceiling, the space for movement is limited, and it is difficult to reconnect the two straight pipes if they fall off.

[0036] In addition, such as Figure 1 , Figure 2 , Figure 3 The stainless steel flue pipes shown have folded edges to prevent hand cuts. Specifically, the end of the constricted pipe has a flange 7. The rear end of the first straight pipe has an inward flange 211, the rear end of the second straight pipe 22 has an outward flange 221, and the front end of the second straight pipe 22 has a fold 20.

[0037] Due to factors such as rigid pipe deformation, the weight of the rigid pipe itself, and installation errors, it is difficult for the stainless steel elbow to be concentric with the range hood exhaust hood 9, making installation difficult. Therefore, this technical solution uses an aluminum foil flue pipe connected to the lower end of the stainless steel elbow to achieve adjustable flue pipe and facilitate installation. In addition, from the perspective of wind resistance, the length of this reinforced aluminum foil flue pipe will not be long, and it is only used to connect the stainless steel elbow and the range hood exhaust hood 9.

[0038] like Figure 4 As shown, the front end of the second straight pipe 22 is inserted into the check valve 10. When installing this flue, the positions of the check valve 10 and the range hood exhaust hood 9 will be known beforehand. First, pre-install the plastic expansion joint and hooks. Take out the first straight pipe 21 and the second straight pipe 22, insert the second straight pipe 22 into the check valve 10, tighten the screws, wrap it with tape, and secure it to the ceiling with cable ties. Insert the stainless steel elbow into the first straight pipe 21, wrap it with tape, and secure it with cable ties. At this point, the stainless steel elbow and the first straight pipe 21 can be considered as a single unit. Pull the first straight pipe 21 to make the stainless steel elbow and the exhaust hood 9 concentric, then use tape to bond the mating joint of the first straight pipe 21 and the second straight pipe 22, and secure it with cable ties. Finally, connect the encrypted aluminum foil flue to the exhaust hood 9 and the stainless steel elbow, and bond it with tape to complete the installation.

[0039] The above technical solution is for a scenario with two stainless steel straight pipes, namely, the first straight pipe 21 + the second straight pipe 22. There may also be scenarios where the flue pipes need to be extended and connected. For example, if three flue pipes need to be installed, the configuration can be: second straight pipe 22 + first straight pipe 21 + second straight pipe 22; if four flue pipes need to be installed, the configuration can be: first straight pipe 21 + second straight pipe 22 + first straight pipe 21 + second straight pipe 22; if five flue pipes need to be installed, the configuration can be: second straight pipe 22 + first straight pipe 21 + second straight pipe 22 + first straight pipe 21 + second straight pipe 22; and the same principle applies to requiring more flue pipes.

[0040] Example 2: In this example, the first hardness of the flue pipe is a plastic flexible tube, and the other structures are the same as in Example 1.

[0041] Example 3: In this example, the first straight pipe 21, the second straight pipe 22, and the elbow are made of rigid plastic pipes, while the other structures are the same as in Example 1.

[0042] Example 4: In this example, the elbow is made of rigid plastic pipe, and the other structures are the same as in Example 1.

[0043] Example 5: As shown in the appendix Figure 5 and attached Figure 6 As shown, this embodiment uses three straight pipes, starting from the bend and connecting in sequence the second straight pipe 22, the first straight pipe 21, the second straight pipe 22, and the check valve 10.

[0044] The outer diameter of the annular limiting platform 6 of the elbow is between the outer diameter of the first straight pipe 21 and the inner diameter of the second straight pipe 22. This ensures that when the elbow is connected to the first straight pipe, the annular limiting platform is located outside the first straight pipe 21, and may not contact it or may abut against its end. When the elbow is connected to the second straight pipe, the annular limiting platform is located inside the second straight pipe 22, and may contact, not contact, or partially contact the inner wall of the second straight pipe 22.

[0045] Example 6: As attached Figure 7 and attached Figure 8 As shown, this embodiment uses four straight pipes, starting from the bend and connecting in sequence the first straight pipe 21, the second straight pipe 22, the first straight pipe 21, the second straight pipe 22, and the check valve 10.

Claims

1. An extraction ducting system characterised in that, It includes at least two types of smoke pipes with different hardnesses: a first hardness smoke pipe and a second hardness smoke pipe. The first hardness is less than the second hardness. According to the direction of oil fume emission, the first hardness smoke pipe is located upstream of the second hardness smoke pipe.

2. The extraction ducting system according to claim 1, wherein, The exhaust system has an exhaust hood, and one end of the first hardened exhaust pipe is connected to the exhaust hood.

3. The extraction ducting system according to claim 1, wherein, The exhaust system has an elbow, the front end of which is connected to the first-hardness exhaust pipe, and the rear end of which is connected to the second-hardness exhaust pipe.

4. The extraction ducting system according to claim 3, wherein, The hardness of the elbow is roughly the same as that of the second-hardness flue pipe, or the materials are roughly the same.

5. The extraction ducting system according to claim 3, wherein, The elbow has a constriction tube at the rear end, which is inserted into the second-hardness smoke tube. The diameter of the constriction tube gradually decreases on the side closest to the second-hardness smoke tube.

6. The extraction ducting system according to claim 3, wherein, The elbow has a constriction tube at its rear end, which is inserted into the second hardness smoke tube. The side of the constriction tube away from the second hardness smoke tube forms an annular limiting platform with the elbow.

7. The extraction ducting system according to claim 5, wherein, The end of the constricted tube has a flange.

8. The duct system of claim 3, wherein, The second-hardness smoke tube includes a first straight tube and a second straight tube. The outer diameter of the first straight tube is not greater than the inner diameter of the second straight tube. The front end of the first straight tube is inserted into the front end of the second straight tube and extends out through the rear end of the second straight tube.

9. The extraction ducting system according to claim 8, wherein, The rear ends of the first straight pipe and the rear ends of the second straight pipe have matching limiting ribs.

10. The extraction ducting system according to claim 9, wherein, The limiting ribs are the first limiting rib located on the outer wall of the first straight pipe and the second limiting rib located on the inner wall of the second straight pipe.

11. The fume exhaust duct system according to claim 9, wherein The rear end of the first straight tube has an inward flange, and the rear end of the second straight tube has an outward flange.

12. The duct system of claim 8, wherein, The front end of the second straight pipe is connected to the check valve, and the rear end of the second straight pipe is also provided with a number of first straight pipes and second straight pipes, with the first straight pipes and second straight pipes spaced apart.

13. The duct system of claim 8, wherein, The elbow has a constriction tube at its rear end, which is inserted into the second hardness smoke tube. The side of the constriction tube away from the second hardness smoke tube forms an annular limiting platform with the elbow. The outer diameter of the annular limiting platform is between the outer diameter of the first straight tube and the inner diameter of the second straight tube.

14. The extraction ducting system according to any one of claims 1 to 12, wherein The first hardness type of cigarette tube is made of aluminum foil, and the second hardness type is made of stainless steel.

15. A range hood comprising an exhaust system, characterized in that The exhaust system includes the oil fume exhaust pipeline system as described in any one of claims 1-13.

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