Air outlet assembly and range hood applying same

Abstract

The utility model discloses an air outlet assembly and a range hood applying the air outlet assembly, and the air outlet assembly comprises an air outlet cover which comprises an external thread; the smoke pipe adapter is used for being connected to a smoke exhaust pipe; the fastening ring is used for connecting the air outlet cover and the smoke tube adapter, the fastening ring comprises an internal thread, and the external thread is meshed with the internal thread, so that the fastening ring and the air outlet cover are fixed; the external threads and the internal threads jointly form n groups of thread groups, an included angle is formed between meshing surfaces of two threads forming each group of thread groups, and the included angle is not equal to 0. Compared with the prior art, the utility model has the advantages that: by changing the angle of the thread meshing surface of the threads of the air outlet cover and the fastening ring, the axial force among multiple threads is more uniform, the force in the normal direction of the thread surface is enhanced, the frictional resistance is further increased, the loosening caused by vibration is prevented, the disassembly and assembly are really convenient and quick, the mold stripping processing is simple, and the production efficiency is improved. And an anti-falling screw does not need to be additionally fastened, so that a worker or a user can conveniently overhaul the valve plate by himself / herself.

Description

Technical Field

[0001] The utility model relates to an oil fume purification device, in particular to an air outlet component and an oil fume extractor with the air outlet component. Background Art

[0002] Range hoods have become one of the indispensable kitchen appliances in modern families. Range hoods work based on the principle of fluid dynamics. A centrifugal fan installed inside the range hood absorbs and exhausts oil smoke, and uses a filter to filter out some grease particles. The centrifugal fan includes a volute, an impeller installed in the volute, and a motor that drives the impeller to rotate. When the impeller rotates, negative pressure suction is generated at the center of the fan, sucking the oil smoke under the range hood into the fan. After being accelerated by the fan, it is collected by the volute and guided to be discharged outdoors.

[0003] Existing range hoods are generally equipped with an air hood at the fan outlet, which has the functions of gathering air and guiding the flow, and connecting the range hood with the air outlet pipe. The valve of the traditional air hood is easy to get stuck, and it needs to be repaired by disassembling the air outlet pipe. However, many existing range hood air outlet pipes are often directly entangled with tape or connected with screws, but because the cabinet space is small and there is a smoke pipe, it is not convenient to disassemble and assemble.

[0004] Therefore, there are now some air outlet hood installation structures that can achieve quick disassembly, such as the Chinese patent application number 202121230268.6 of the applicant, which discloses an air outlet hood for a range hood, comprising: a hood body, a connecting ring, and a locking sleeve for facilitating quick disassembly and assembly of the air inlet ring and the hood body, the outer circumferential surface of the outer annular wall of the hood body has a first limiting rib arranged in a spiral direction thereof, the inner circumferential surface of the locking sleeve has a second limiting rib arranged in a spiral direction thereof, and the locking sleeve is constrained on the outer annular wall by the limiting cooperation between the first limiting rib and the second limiting rib.

[0005] The locking sleeve and the cover body are threaded. Figure 8 to Figure 10 , ordinary thread fits carry 70% to 80% of the load on the first meshing surface (N1), while the loads carried by the subsequent meshing surfaces are rarely accumulated to 20-30% (N2, N3). In the figure, F1, F2, and F3 are normal forces. Under the action of vibration load, ordinary threads can easily overcome the preload on the thread contact surface and produce relative movement, resulting in loosening. And for commonly used plastic parts such as air outlet hoods, the first tooth of ordinary threads is subjected to the greatest force, and plastic parts are easily damaged, leading to oil and air leakage (this position is the high-pressure area of ​​the fan outlet, and the current maximum static pressure of the range hood can reach 1000Pa). Therefore, there is still room for improvement. Utility Model Content

[0006] The first technical problem to be solved by the utility model is to provide an air outlet assembly to address the deficiencies of the above-mentioned prior art, so as to facilitate the disassembly and assembly of the air outlet cover and the smoke pipe and prevent them from loosening in the installed state.

[0007] The second technical problem to be solved by the present invention is to provide a range hood using the above-mentioned air outlet assembly.

[0008] The technical solution adopted by the utility model to solve the above-mentioned first technical problem is: an air outlet component, comprising:

[0009] An air outlet hood, including an external thread;

[0010] A smoke pipe adapter for connecting to a smoke exhaust pipe; and

[0011] The fastening ring is used to connect the air outlet cover and the smoke pipe adapter, and the fastening ring includes an internal thread, and the external thread and the internal thread are meshed with each other, so as to fix the fastening ring and the air outlet cover; the characteristics are:

[0012] The external thread and the internal thread together form n groups of thread teeth, and there is an angle between the meshing surfaces of the two thread teeth constituting each group of thread teeth, and the angle is ≠0.

[0013] By changing the meshing angle of the threads of the air outlet cover and the fastening ring, the axial force between the multiple threads can be more uniform, the normal force of the thread surface can be enhanced, and the friction resistance can be increased to prevent loosening caused by vibration. It is truly convenient and quick to disassemble and assemble, and the demolding process is simple. There is no need for additional tightening of anti-loosening screws, which makes it convenient for staff or users to inspect the valve plate themselves.

[0014] According to one aspect of the utility model, the angles between the meshing surfaces of two screw threads of each screw thread group are equal and are both α.

[0015] Preferably, the value range of α is [5°, 40°].

[0016] According to another aspect of the utility model, the fastening ring has n screw threads for cooperating with the air outlet cover, and the screw thread of the internal thread that first contacts the air outlet cover when the fastening ring is tightened is recorded as screw thread A No. 1, and the screw thread that contacts the air outlet cover second is recorded as screw thread A No. 2, and so on, and the screw thread that contacts the air outlet cover last is recorded as screw thread A No. n;

[0017] After tightening with the tightening ring, the thread of the external thread meshing with the thread A No. 1 is recorded as the thread B No. 1, the thread of the external thread meshing with the thread A No. 2 is recorded as the thread B No. 2, and so on, the thread of the external thread meshing with the thread A No. n is recorded as the thread B No. n;

[0018] The No. 1 screw thread A and the No. 1 screw thread B constitute a No. 1 screw thread group, the No. 2 screw thread A and the No. 2 screw thread B constitute a No. 2 screw thread group, and so on, the No. n screw thread A and the No. n screw thread B constitute a No. n screw thread group;

[0019] The meshing angle of the two threads of the No. 1 thread group is α1, the meshing angle of the two threads of the No. 2 thread group is α2, and so on. The meshing angle of the two threads of the No. n thread group is α n , and satisfy α1<α2……<α n .

[0020] Preferably, α1, α2, ... α n is an arithmetic progression.

[0021] Preferably, α2-α1=β, and the value range of β is (0, 15°].

[0022] To facilitate the threaded cooperation between the air outlet cover and the fastening ring, the air outlet cover comprises a cover body with openings at both ends and an outer ring wall arranged on the cover body, and the outer thread is formed on the outer surface of the outer ring wall.

[0023] Preferably, both ends of the cover body are open and respectively constitute an air inlet and an air outlet, the outer annular wall is arranged at intervals on the outer periphery of the air outlet of the cover body, and the smoke pipe adapter is connected at the air outlet.

[0024] In order to facilitate the threaded cooperation between the air outlet cover and the fastening ring, the fastening ring further comprises a ring body with openings at both ends, the internal thread is formed inside the ring body, and the ring body is arranged around the outer circumference of the outer ring wall.

[0025] The technical solution adopted by the utility model to solve the second technical problem is: a range hood, characterized in that: the air outlet component as described above is applied.

[0026] Compared with the prior art, the advantages of the utility model are: by changing the thread meshing surface angle of the threads of the air outlet cover and the fastening ring, the axial force between multiple threads is made more uniform, the normal direction force of the thread surface is enhanced, and the friction resistance is increased to prevent loosening caused by vibration. It is truly convenient and quick to disassemble and assemble, the demolding process is simple, and no additional tightening of anti-slip screws is required, which is convenient for staff or users to inspect the valve plate themselves. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the air outlet assembly of the first embodiment of the utility model;

[0028] Figure 2 It is a cross-sectional view of the air outlet assembly of the first embodiment of the utility model;

[0029] Figure 3 for Figure 2A schematic diagram of the partial enlargement of Ⅰ;

[0030] Figure 4 for Figure 3 A partial II enlarged schematic diagram of

[0031] Figure 5 This is a schematic diagram of the relationship between the screw thread and the load of the air outlet assembly of the first embodiment of the utility model;

[0032] Figure 6 It is a partial cross-sectional view of the air outlet assembly of the second embodiment of the utility model;

[0033] Figure 7 This is a schematic diagram of the relationship between the screw thread and the load of the air outlet assembly of the second embodiment of the utility model;

[0034] Figure 8 It is a cross-sectional view of the air outlet assembly of the first embodiment of the utility model;

[0035] Fig. 9 for Figure 8 A partial III enlarged schematic diagram of

[0036] Fig.10 This is a schematic diagram of the relationship between the screw thread and load of the air outlet assembly of the first embodiment of the utility model. DETAILED DESCRIPTION

[0037] Embodiments of the present utility model are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions.

[0038] In the description of the present utility model, 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 the orientation or position relationship based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying 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 utility model 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, the features defined as "first" and "second" may explicitly or implicitly include one or more of such features.

[0039] Embodiment 1

[0040] See also Figure 1 to Figure 5 An air outlet assembly is applied to a range hood, comprising an air outlet cover 1 arranged at the air outlet of a fan of the range hood, a smoke pipe adapter 2 for connecting to a smoke exhaust pipe, and a fastening ring 3 for connecting the air outlet cover 1 and the smoke pipe adapter 2. The smoke pipe adapter 2 and the smoke pipe are fixed in advance, and the smoke pipe does not need to be frequently disassembled and replaced.

[0041] The air outlet hood 1 includes a hood body 11 , with two ends of the hood body 11 open, one end constituting an air inlet 111 , and the other end constituting an air outlet 112 . The oil smoke exhausted by the fan enters from the air inlet 111 and then is exhausted to the smoke pipe from the air outlet 112 .

[0042] The air outlet hood 1 further includes an outer ring wall 12 disposed at the air outlet 112 of the hood body 11, the outer ring wall 11 may be higher than the hood body 11, and is arranged at intervals from the edge of the air outlet 112. The cross section of the outer ring wall 11 is circular. An external thread 13 is formed on the outer surface of the outer ring wall 12. The smoke pipe adapter 2 is connected at the air outlet 112.

[0043] The fastening ring 3 includes a roughly cylindrical ring body 31 with openings at both ends and an internal thread 32 formed inside the ring body 31. During installation, the ring body 31 of the fastening ring 3 is arranged around the outer circumference of the outer ring wall 12, and the external thread 13 and the internal thread 32 are meshed with each other, thereby fixing the fastening ring 3 and the air outlet cover 1.

[0044] When tightening the fastening ring 3, the first thread of the internal thread 32 that contacts the outer ring wall 12 is recorded as the No. 1 thread A321, the second thread that contacts the outer ring wall 12 is recorded as the No. 2 thread A322, and the last thread that contacts the outer ring wall 12 is recorded as the No. 3 thread A323. After the fastening ring 3 is tightened, the thread of the external thread 13 that meshes with the No. 1 thread A321 is recorded as the No. 1 thread B131, the thread of the external thread 13 that meshes with the No. 2 thread A322 is recorded as the No. 2 thread B132, and the thread of the external thread 13 that meshes with the No. 3 thread A323 is recorded as the No. 3 thread B133. Figure 3 As shown in , the No. 1, 2, and 3 threads are arranged from top to bottom. If the number of threads is greater than 3, the counting method is similar. That is, when the number of threads is n, the thread of the internal thread 32 contacting the outer ring wall 12 is recorded as the No. n thread A, and correspondingly, the thread of the external thread 13 matching the No. n thread A is recorded as the No. n thread B, and the two constitute a thread group.

[0045] The No. 1 screw thread A321 has a first meshing surface A3211 meshing with the No. 1 screw thread B131, and the No. 1 screw thread B131 has a first meshing surface B1311 meshing with the No. 1 screw thread A321. The first meshing surface A3211 and the first meshing surface B1311 are not parallel. The angle between the first meshing surface A3211 and the first meshing surface B1311 is α, and α≠0. When the external thread 13 and the internal thread 32 are meshed, the tip of the No. 1 screw thread A321 of the internal thread 32 is pressed tightly against the first meshing surface B1311 of the No. 1 screw thread B131 of the external thread 13 (rather than the two meshing surfaces being in close contact), so that the direction of the normal force F1 at the contact point changes. The above-mentioned angle α also exists between the meshing surfaces of other screw threads.

[0046] As a result, the force between each meshing thread is relatively uniform. The load of the No. 1 thread group (a combination of No. 1 thread A321 and No. 1 thread B131) accounts for 40-60%, the load of the No. 2 thread group (a combination of No. 2 thread A322 and No. 2 thread B132) accounts for 20-35%, and the load of the No. 3 thread group (a combination of No. 3 thread A323 and No. 3 thread B133) accounts for 10-25%. F2 and F3 are the normal forces at the contact points of the meshing surfaces of the No. 2 thread group and the No. 3 thread group, respectively. N1, N2, and N3 are the axial preloads of the corresponding thread groups, respectively. Due to the change in the normal angle, even under the same axial preload N, the positive pressure F in the normal direction of the meshing point is significantly improved compared to the existing ordinary threads. According to θ is the angle between the normal and the axial direction. As θ increases, even if N remains the same, F also increases, thereby increasing the friction force preventing relative sliding and improving the anti-loosening ability.

[0047] Because a more evenly distributed axial preload is provided, plastic parts are less likely to be damaged and the risk of oil leakage is reduced.

[0048] Preferably, the value range of α is [5°, 40°]. If the angle is too small, the load distribution and the normal force direction will not change significantly. If the angle is too large, it will easily lead to excessive thread removal and reduced strength under axial force. In this embodiment, the more preferred α is 23°.

[0049] Embodiment 2

[0050] See also Figure 6, which is different from the above-mentioned embodiment 1 in that the angle between the meshing surfaces of the two screw threads of the No. 1 screw thread group is α1, the angle between the meshing surfaces of the No. 2 screw thread group is α2, and the angle between the meshing surfaces of the No. 3 screw thread group is α3. In embodiment 1, α1=α2=α3, while in this embodiment, α1<α2<α3. For example, α2-α1=β, α3-α2=β, and the preferred value range of β is (0, 15°]. α1, α2, and α3 may or may not be an arithmetic progression. As in this embodiment, more preferably, α2=α1+2°, α3=α1+3°.

[0051] See also Figure 7 , through the load distribution diagram after the above-mentioned angle change, in this embodiment, the load of No. 1 thread group (the combination of No. 1 thread A321 and No. 1 thread B131) accounts for 35-40%, the load of No. 2 thread group (the combination of No. 2 thread A322 and No. 2 thread B132) accounts for 30-35%, and the load of No. 3 thread group (the combination of No. 3 thread A323 and No. 3 thread B133) accounts for 25-30%, and the axial force distribution is more uniform.

[0052] In addition, because the normal angle changes gradually, even under the same axial preload N, the positive pressure F in the normal direction of the meshing point of subsequent threads such as No. 2 and No. 3 threads is greater than that of the original solution. Even though θ is the same as α in the first embodiment, there is a step difference β in this embodiment. Even though N is the same, F increases, thereby increasing the friction force preventing relative sliding and improving the anti-loosening capability.

[0053] In addition, because a more evenly distributed axial preload is provided, plastic parts are less likely to be damaged and the risk of oil leakage is reduced.

[0054] In addition, if there is n-number thread set, the angle of the meshing surface of the n-number thread set is α n In the first embodiment, α1=α2=α3=…α n , and in this embodiment, α1<α2<α3……<α n α1, α2, α3...α n It can be an arithmetic progression or not.

Claims

1. An air outlet assembly, comprising: The air outlet cover (1) comprises an external thread (13); A smoke pipe adapter (2), used for connecting to a smoke exhaust pipe; as well as The fastening ring (3) is used to connect the air outlet cover (1) and the smoke pipe adapter (2), the fastening ring (3) comprises an internal thread (32), the external thread (13) and the internal thread (32) are meshed with each other, so as to fix the fastening ring (3) and the air outlet cover (1); the characteristics are: The external thread (13) and the internal thread (32) together form n groups of thread teeth, and there is an angle between the meshing surfaces of the two thread teeth constituting each group of thread teeth, and the angle is ≠0.

2. The air outlet assembly according to claim 1, characterized in that: The angles between the meshing surfaces of the two screw teeth of each screw tooth group are equal.

3. The air outlet assembly according to claim 2, characterized in that: The angle between the meshing surfaces of the two screw teeth of each screw tooth group is α, and the value range of α is [5°, 40°].

4. The air outlet assembly according to claim 1, characterized in that: The fastening ring (3) has n screw threads for cooperating with the air outlet cover (1), where n≥3. When the fastening ring (3) is tightened, the screw thread of the internal thread (32) that first contacts the air outlet cover (1) is recorded as screw thread No. 1 (321), and the screw thread that contacts the air outlet cover (1) second is recorded as screw thread No. 2 (322), and so on. The screw thread that contacts the air outlet cover (1) last is recorded as screw thread No. n (321). After tightening with the tightening ring (3), the thread of the external thread (13) meshing with the No. 1 thread A (321) is recorded as the No. 1 thread B (131), the thread of the external thread (13) meshing with the No. 2 thread A (322) is recorded as the No. 2 thread B (132), and so on, the thread of the external thread (13) meshing with the No. n thread A is recorded as the No. n thread B; The No. 1 screw thread A (321) and the No. 1 screw thread B (131) constitute a No. 1 screw thread group, the No. 2 screw thread A (322) and the No. 2 screw thread B (132) constitute a No. 2 screw thread group, and so on, the No. n screw thread A and the No. n screw thread B constitute a No. n screw thread group; The meshing angle of the two threads of the No. 1 thread group is α1, the meshing angle of the two threads of the No. 2 thread group is α2, and so on. The meshing angle of the two threads of the No. n thread group is α n , and satisfy α1<α2……<α n .

5. The air outlet assembly according to claim 4, characterized in that: α1, α2, ... α n is an arithmetic progression.

6. The air outlet assembly according to claim 5, characterized in that: α2-α1=β, the value range of β is (0, 15°].

7. The air outlet assembly according to claim 1, characterized in that: The air outlet cover (1) comprises a cover body (11) with openings at both ends and an outer ring wall (12) arranged on the cover body (11), and the outer thread (13) is formed on the outer surface of the outer ring wall (12).

8. The air outlet assembly according to claim 7, characterized in that: The two ends of the cover body (11) are open and respectively constitute an air inlet (111) and an air outlet (112); the outer ring wall (12) is arranged at intervals on the outer periphery of the air outlet (112) of the cover body (11); and the smoke pipe adapter (2) is connected to the air outlet (112).

9. The air outlet assembly according to claim 8, characterized in that: The fastening ring (3) further comprises a ring body (31) with openings at both ends, the internal thread (32) is formed inside the ring body (31), and the ring body (31) is arranged around the outer circumference of the outer ring wall (12).

10. A range hood, characterized in that: The invention is applied with an air outlet component as described in any one of claims 1 to 9.

Images