Sealing device of air duct

Abstract

The utility model discloses a sealing device of an air duct, which is used for being installed at the joint of an air duct shell and a volute, and relates to the technical field of air duct sealing, the sealing device comprises a sealing gasket and a sealing strip, the sealing gasket is matched with a sealing groove arranged on the air duct shell, and the top surface of the sealing gasket is attached to the end surface of the volute; the sealing strip is arranged on the top face of the sealing gasket, the sealing strip can be clamped in the assembling hole of the volute so as to limit the sealing strip to move relative to the volute, the sealing device and the volute can be assembled firstly, the sealing strip can be clamped in the assembling hole of the volute so that the position of the sealing strip relative to the volute can be fixed, and the sealing gasket is connected to the bottom of the sealing strip. The position of the sealing gasket relative to the volute is fixed, the volute assembled with the sealing device is installed at the corresponding position of the air duct shell, the sealing gasket can be located in the sealing groove, sealing of the connecting position of the air duct shell and the volute is completed, and therefore the influence that the boss of the rubber sealing gasket falls off or partially falls off from the fan volute can be avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of air duct sealing, and particularly relates to a sealing device for an air duct. Background Art

[0002] With the rapid development of the economy, various washing machine products are constantly updated, and the market of washing machines with drying functions is gradually showing an upward trend. As an important module of drying washing machines, the performance of the fan has also become an important indicator to measure the level of household electrical appliances. The continuous large-volume air delivery of the drying fan is not only related to the power of the motor itself, but also closely related to the airtightness of the entire drying device.

[0003] In the existing technology, the fan volute and the air duct housing are assembled by screws. Since it is difficult to ensure the airtightness of the flow channel when directly assembling between structural parts, and the fan volute is an injection molded part and the air duct housing is a cast aluminum part, the difference in the thermal expansion coefficients of the two different materials is relatively large, which further exacerbates the risk of air leakage in the air duct. Therefore, a rubber gasket is required between the fan volute and the air duct housing to ensure the airtightness of the fan module. However, in the existing technology, the rubber gasket is first assembled with the fan volute and then placed on the air duct housing. The boss of the rubber gasket and the assembly hole of the fan volute are assembled with a gap. When assembling with the component air duct housing, the rubber gasket is likely to fall off from the fan volute, directly causing jams during the assembly on the production line and indirectly affecting the production efficiency; if the boss of the rubber gasket falls off or partially falls off from the fan volute, it will lead to poor assembly, thereby affecting the airtightness of the air duct and posing a safety hazard.

[0004] Therefore, how to avoid the influence of the boss of the rubber gasket falling off or partially falling off from the fan volute is a technical problem that those skilled in the art need to solve at present. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a sealing device for an air duct, which can avoid the influence of the boss of the rubber gasket falling off or partially falling off from the fan volute.

[0006] To achieve the above purpose, the utility model provides a sealing device for an air duct, which is used to be installed at the connection between the air duct housing and the volute. The sealing device includes:

[0007] A gasket, which is adapted to a sealing groove provided on the air duct housing, and the top surface of the gasket fits against the end surface of the volute;

[0008] A sealing strip, which is arranged on the top surface of the gasket, and the sealing strip can be clamped in the assembly hole of the volute to limit the movement of the sealing strip relative to the volute.

[0009] Preferably, the sealing strip includes:

[0010] The penetrating portion is connected to the top surface of the sealing gasket and is located in the assembly hole;

[0011] The clamping portion is connected to a side of the penetrating portion facing away from the sealing gasket, and the diameter of the clamping portion is larger than the diameter of the assembly hole.

[0012] Preferably, the sealing strip further comprises a guide strip connected to a side of the clamping portion facing away from the penetration portion, and a diameter of the guide strip is smaller than a diameter of the assembly hole.

[0013] Preferably, the clamping portion and the guide strip are smoothly connected, and an abutting surface is formed between the outer periphery of the clamping portion and the outer periphery of the penetration portion to abut against the top end surface of the assembly hole.

[0014] Preferably, there are multiple sealing strips, and the penetration portion, the clamping portion and the guide strip in the same sealing strip are coaxially arranged, and the axes of all the sealing strips are parallel to each other and perpendicular to the top surface of the sealing gasket.

[0015] Preferably, the sealing strip corresponds to the assembly hole one-to-one, the diameter of the penetration portion is less than or equal to the diameter of the corresponding assembly hole, and the length of the penetration portion on its own axis is the same as the thickness of the corresponding assembly hole on the axis of the penetration portion.

[0016] Preferably, the length of the guide strip along the axis of the penetration portion is greater than the thickness of the assembly hole along the axis of the penetration portion.

[0017] Preferably, the ratio of the diameter of the clamping portion to the diameter of the corresponding assembly hole is 1.1-1.5; the ratio of the diameter of the guide bar to the diameter of the corresponding assembly hole is 0.6-0.9.

[0018] Preferably, the clamping portion is an elastic structure.

[0019] Compared with the above-mentioned background technology, the sealing device of the air duct provided by the present invention is used to be installed at the connection between the air duct shell and the volute. The sealing device includes a sealing gasket and a sealing strip. The sealing gasket is adapted to the sealing groove provided on the air duct shell, and the top surface of the sealing gasket is attached to the end face of the volute; the sealing strip is provided on the top surface of the sealing gasket, and the sealing strip can be clamped in the assembly hole of the volute to limit the movement of the sealing strip relative to the volute.

[0020] Specifically, the sealing device and the volute can be assembled first, and the sealing strip can be snapped into the assembly hole of the volute to fix the position of the sealing strip relative to the volute. The sealing gasket is connected to the bottom of the sealing strip to fix the position of the sealing gasket relative to the volute. The volute equipped with the sealing device is installed to the corresponding position of the air duct casing, so that the sealing gasket can be located in the sealing groove to complete the sealing of the connection between the air duct casing and the volute. Such an arrangement can avoid the impact of the rubber sealing gasket boss falling off or partially falling off from the fan volute. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for describing the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the provided drawings.

[0022] Figure 1 It is a structural sectional view when the sealing device of the air duct provided by the embodiment of the present invention is installed;

[0023] Figure 2 It is a schematic structural diagram of the air duct shell provided by the embodiment of the present invention;

[0024] Figure 3 It is a schematic structural diagram of the volute provided by the embodiment of the present invention;

[0025] Figure 4 It is a schematic structural diagram when the sealing device of the air duct provided by the embodiment of the present invention is installed.

[0026] Wherein:

[0027] 100 - air duct shell, 110 - sealing groove;

[0028] 200 - volute, 210 - assembly hole;

[0029] 300 - sealing gasket;

[0030] 400 - sealing strip, 410 - threading part, 420 - clamping part, 430 - guiding strip. Detailed implementation manners

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0032] To enable those skilled in the art of this technology to better understand the solution of the present invention, the present invention will be further described in detail below with reference to the drawings and specific implementation manners.

[0033] In the description of the present invention, it should be understood that the terms "top", "bottom", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the position or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation of the present invention.

[0034] The utility model aims to provide a sealing device for an air duct, which can prevent the rubber sealing pad boss from falling off or partially falling off from the fan volute.

[0035] See also Figures 1 to 4 To achieve the above-mentioned purpose, the present invention provides a sealing device for an air duct, which is used to be installed at the connection between the air duct housing 100 and the volute 200 . The sealing device includes a sealing gasket 300 and a sealing strip 400 .

[0036] The sealing gasket 300 is adapted to fit in the sealing groove 110 provided on the air duct housing 100 , and the top surface of the sealing gasket 300 is in contact with the end surface of the volute 200 .

[0037] It can be understood that the volute 200 is an injection-molded part and the air duct shell 100 is a cast aluminum part. The thermal expansion coefficients of the two different materials are quite different. The sealing gasket 300 is located between the volute 200 and the air duct shell 100 to increase the air tightness of the air duct. The sealing gasket 300 can be made of rubber material, and the sealing gasket 300 can be deformed by extrusion, so that the sealing gasket 300 fits tightly to the air duct shell 100 and the volute 200.

[0038] By setting the sealing groove 110 on the air duct shell 100, the installation and positioning of the sealing gasket 300 can be facilitated to prevent the lateral movement of the sealing gasket 300 from affecting the sealing effect. The opening size of the sealing groove 110 can be selected according to actual needs and is not specifically limited here. The sealing gasket 300 can be adapted to the corresponding sealing groove 110.

[0039] For example, when the assembly end between the volute 200 and the air duct housing 100 is constructed into an inverted U shape, the outer shape of the sealing gasket 300 adopts a U-shaped structure including two bent portions and a horizontal portion, and the ends of the two bent portions facing away from the horizontal portion include a horizontal extension section. The following sealing strip 400 provided on the horizontal portion and the horizontal extension section is clamped with the assembly hole 210 of the volute 200 to achieve relative stability of the position of the sealing gasket 300.

[0040] The sealing strip 400 is disposed on the top surface of the sealing gasket 300 , and the sealing strip 400 can be snapped into the assembly hole 210 of the volute 200 to limit the movement of the sealing strip 400 relative to the volute 200 .

[0041] By clamping the sealing strip 400 with the assembly hole 210, the sealing strip 400 is fixed relative to the volute 200, which can avoid the problem that the existing rubber gasket 300 is easily detached from the fan volute 200.

[0042] The sealing device and the volute 200 can be assembled first. The sealing strip 400 can be clamped in the assembly hole 210 of the volute 200, so that the position of the sealing strip 400 relative to the volute 200 is fixed. The gasket 300 is connected to the bottom of the sealing strip 400, so that the position of the gasket 300 relative to the volute 200 is fixed. The volute 200 equipped with the sealing device is installed at the corresponding position of the air duct housing 100, and the gasket 300 can be located in the sealing groove 110, completing the sealing of the connection between the air duct housing 100 and the volute 200. With such a setting, the influence of the convex platform of the rubber gasket 300 falling off or partially falling off from the fan volute 200 can be avoided.

[0043] In this embodiment, the sealing strip 400 includes a penetrating portion 410 and a clamping portion 420. The penetrating portion 410 is connected to the top surface of the gasket 300, and the penetrating portion 410 is located in the assembly hole 210; the clamping portion 420 is connected to the side of the penetrating portion 410 away from the gasket 300, and the diameter of the clamping portion 420 is greater than the diameter of the assembly hole 210.

[0044] It can be understood that when the diameter of the clamping portion 420 is greater than the diameter of the assembly hole 210, the free passage of the clamping portion 420 through the assembly hole 210 can be restricted, thereby realizing the clamping of the sealing strip 400 and the assembly hole 210. At the same time, considering the horizontal movement of the clamping portion 420 relative to the assembly hole 210, it is preferred that the sealing strip 400 includes a penetrating portion 410 located in the assembly hole 210. By the diameter size relationship between the penetrating portion 410 and the assembly hole 210, the clamping portion 420 is restricted to be fixed relative to the assembly hole 210.

[0045] Among them, the diameter of the penetrating portion 410 is less than or equal to the diameter of the corresponding assembly hole 210, so as to facilitate the installation of the sealing strip 400 into the assembly hole 210 of the volute 200, and the length of the penetrating portion 410 on its own axis is the same as the thickness of the corresponding assembly hole 210 on the axis of the penetrating portion 410, so as to restrict the axial movement of the sealing strip 400 relative to the assembly hole 210.

[0046] It should be noted that the sealing strip 400 further includes a guiding strip 430 connected to the side of the clamping portion 420 away from the penetrating portion 410. The diameter of the guiding strip 430 is less than the diameter of the assembly hole 210, and the length of the guiding strip 430 on the axis of the penetrating portion 410 is greater than the thickness of the assembly hole 210 on the axis of the penetrating portion 410.

[0047] When assembling the sealing device to the volute 200, first align the sealing strip 400 of the sealing device with the corresponding assembly hole 210. Then insert the sealing strip 400 into the assembly hole 210. The guiding strip 430 of the sealing strip 400 first penetrates into the assembly hole 210 until the end of the guiding strip 430 away from the clamping portion 420 completely passes through the assembly hole 210. At this time, the clamping portion 420 has not entered the assembly hole 210 or abutted against the bottom of the assembly hole 210. Through an external force, pull the guiding strip 430 or apply a thrust towards the assembly hole 210 from the bottom of the gasket 300, so that the clamping portion 420 passes through the assembly hole 210 to complete the clamping with the assembly hole 210. At this time, the penetrating portion 410 is partially or entirely located in the assembly hole 210, completing the assembly process.

[0048] In this embodiment, through multiple tests, it is determined that when the ratio of the diameter of the clamping portion 420 to the diameter of the corresponding assembly hole 210 is 1.1 - 1.5, the clamping effect between the sealing strip 400 and the assembly hole 210 is better; when the ratio of the diameter of the guiding strip 430 to the diameter of the corresponding assembly hole 210 is 0.6 - 0.9, the guiding effect on the clamping portion 420 is better.

[0049] Specifically, when the diameter of the assembly hole 210 is 3.0 mm, the diameter of the clamping portion 420 can be 3.3 mm - 4.5 mm. When the diameter of the clamping portion 420 is selected as 3.3 mm, it is convenient for installation. When the diameter of the clamping portion 420 is selected as 4.5 mm, the clamping effect is better. The diameter of the guiding strip 430 can be 1.8 mm - 2.7 mm. When the diameter of the guiding strip 430 is selected as 1.8 mm, it is convenient for the penetration of the guiding strip 430. When the diameter of the guiding strip 430 is selected as 2.7 mm, the guiding strip 430 has higher strength to prevent excessive deformation during the pulling process.

[0050] Preferably, the diameter of the clamping portion 420 is preferably 3.4 mm (0.4 mm larger than the diameter of the assembly hole 210 of the volute 200), and the thickness of the clamping portion 420 on its own axis is preferably 2.5 mm, which can ensure stable clamping while avoiding that the clamping portion 420 is too thick to be easily inserted into the assembly hole 210. The diameter of the guiding strip 430 is preferably 2.0 mm, and the length of the guiding strip 430 on its own axis is preferably 7 mm (longer than the length of the assembly hole 210 on its own axis).

[0051] Among them, considering the assembly and clamping process of the sealing strip 400 and the assembly hole 210, the clamping portion 420 adopts an elastic structure. The clamping portion 420 made of an elastic material can meet the deformation during the installation process and the restoration after deformation to ensure its clamping effect. The specific material of the clamping portion 420 can be selected according to the actual situation as long as the above object can be achieved.

[0052] Considering the abutting process between the clamping part 420 and the assembly hole 210 before the clamping part 420 passes through the assembly hole 210, it is preferred that the clamping part 420 and the guiding strip 430 are smoothly connected. Through this smooth arc surface, the clamping part 420 can slide into the clamping part 420 under the traction of the guiding strip 430, reducing the resistance during the assembly process. Considering that the clamping part 420 after assembly needs to abut against the top of the assembly hole 210, it is preferred that an abutting surface is formed between the outer periphery of the clamping part 420 and the outer periphery of the penetrating part 410. Through the design of the abutting surface, the resistance of the relative movement between the bottom of the clamping part 420 and the assembly hole 210 can be increased to abut against the top end surface of the assembly hole 210, maintaining the stable clamping of the sealing strip 400 and the assembly hole 210.

[0053] It should be noted that there are multiple sealing strips 400, and the sealing strips 400 correspond to the assembly holes 210 one by one. The penetrating part 410, the clamping part 420 and the guiding strip 430 in the same sealing strip 400 are coaxially arranged. The axes of all the sealing strips 400 are parallel to each other and are all perpendicular to the top surface of the gasket 300, so as to ensure that all the sealing strips 400 can be synchronously penetrated into the corresponding assembly holes 210 and reduce the interference between them.

[0054] In summary, the present application provides a sealing device for an air duct, which is used to be installed at the connection between the air duct housing 100 and the volute 200. The sealing device includes a sealing gasket 300 and a sealing strip 400. The sealing gasket 300 is adapted to the sealing groove 110 provided on the air duct housing 100, and the top surface of the sealing gasket 300 is in contact with the end surface of the volute 200; the sealing strip 400 is provided on the top surface of the sealing gasket 300, and the sealing strip 400 can be snapped into the assembly hole 210 of the volute 200 to limit the movement of the sealing strip 400 relative to the volute 200; the sealing strip 400 includes a penetration portion 410, a snap-on portion 420 and a guide strip. 430, the penetration portion 410 is connected to the top surface of the sealing gasket 300, and the penetration portion 410 is located in the assembly hole 210; the clamping portion 420 is connected to the side of the penetration portion 410 away from the sealing gasket 300, and the diameter of the clamping portion 420 is larger than the diameter of the assembly hole 210; the guide bar 430 is connected to the side of the clamping portion 420 away from the penetration portion 410, and the diameter of the guide bar 430 is smaller than the diameter of the assembly hole 210; the clamping portion 420 and the guide bar 430 are smoothly connected, and abutting surface is formed between the outer periphery of the clamping portion 420 and the outer periphery of the penetration portion 410 to abut the top end surface of the assembly hole 210. Align the sealing strip 400 of the sealing device with the corresponding assembly hole 210, then extend the sealing strip 400 into the assembly hole 210, and the guide strip 430 of the sealing strip 400 first penetrates the assembly hole 210 until the end of the guide strip 430 away from the clamping portion 420 completely penetrates the assembly hole 210. At this time, the clamping portion 420 has not yet entered the assembly hole 210 or abuts against the bottom of the assembly hole 210. The guide strip 430 is pulled by external force, so that the clamping portion 420 passes through the assembly hole 210 to complete the clamping with the assembly hole 210. The penetration portion 410 is partially or completely located in the assembly hole 210, completing the assembly process. After that, the volute 200 with the sealing device can be installed to the corresponding position of the air duct shell 100, which can avoid the impact of the rubber sealing gasket 300 boss falling off or partially falling off from the fan volute 200.

[0055] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0056] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. It should be noted that those skilled in the art can make various improvements and modifications to the present invention without departing from the principles of the present invention, and such improvements and modifications also fall within the scope of protection of the present invention.

Claims

1. A sealing device for an air duct, which is used to be installed at the connection of an air duct housing and a volute, and is characterized in that, The sealing device comprises: A sealing gasket adapted to fit in the sealing groove provided on the air duct housing, with the top surface of the sealing gasket being in contact with the end surface of the volute; A sealing strip is provided on the top surface of the sealing gasket, and the sealing strip can be snapped into the assembly hole of the volute to limit the movement of the sealing strip relative to the volute.

2. The sealing device for the air duct according to claim 1, characterized in that, The sealing strip comprises: a penetration portion connected to the top surface of the sealing gasket, and the penetration portion is located in the assembly hole; The clamping portion is connected to a side of the penetrating portion facing away from the sealing gasket, and the diameter of the clamping portion is larger than the diameter of the assembly hole.

3. The sealing device for the air duct according to claim 2, characterized in that, The sealing strip further includes a guide strip connected to a side of the clamping portion facing away from the penetration portion, and a diameter of the guide strip is smaller than a diameter of the assembly hole.

4. The sealing device for the air duct according to claim 3, characterized in that The clamping portion and the guide strip are smoothly connected, and an abutting surface is formed between the outer periphery of the clamping portion and the outer periphery of the penetration portion to abut against the top end surface of the assembly hole.

5. The sealing device of the air duct according to claim 3, characterized in that, There are multiple sealing strips, and the penetration portion, the clamping portion and the guide strip in the same sealing strip are coaxially arranged. The axes of all the sealing strips are parallel to each other and perpendicular to the top surface of the sealing gasket.

6. The sealing device for the air duct according to claim 5, characterized in that, The sealing strip corresponds to the assembly hole one by one, the diameter of the penetration portion is less than or equal to the diameter of the corresponding assembly hole, and the length of the penetration portion on its own axis is the same as the thickness of the corresponding assembly hole on the axis of the penetration portion.

7. The sealing device for the air duct according to claim 5, characterized in that, The length of the guide strip along the axis of the penetration portion is greater than the thickness of the assembly hole along the axis of the penetration portion.

8. The sealing device for the air duct according to claim 6, characterized in that The ratio of the diameter of the clamping portion to the diameter of the corresponding assembly hole is 1.1-1.5; the ratio of the diameter of the guide bar to the diameter of the corresponding assembly hole is 0.6-0.

9.

9. The sealing device of the air duct according to any one of claims 2 to 8, characterized in that, The clamping portion is an elastic structure.

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