Sealing structure of fan

Abstract

The utility model discloses a sealing structure of a fan, which relates to the technical field of fan sealing and comprises a volute, an impeller, a motor and a flange, the impeller is mounted in the volute, two sides of the flange are fixedly connected with a shell of the motor and the volute respectively, a rotating shaft of the motor penetrates through the flange, and the end of the rotating shaft is inserted into a fixing portion of the impeller. The sealing structure further comprises a sealing piece, the sealing piece comprises a sealing part facing the rotating shaft and a clamping part facing the flange, the sealing part comprises a first extending part and a second extending part which are arranged in a spaced mode and extend to the surface of the rotating shaft, and a first annular groove for storing a lubricating agent is formed between the first extending part and the second extending part. The first ring groove is formed by the first extending part and the second extending part, extending to the surface of the rotating shaft, of the sealing part, more lubricating agents used for reducing the friction resistance of the sealing part and the rotating shaft can be stored, the friction resistance between the sealing structure and the rotating shaft is reduced on the basis that the sealing performance is achieved, and the service life of the sealing structure is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of fan sealing, and particularly relates to a sealing structure of a fan. Background Art

[0002] With the rapid development of the economy, various washing machine products are constantly innovated, 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 appliance products. The continuous large-volume 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] Due to the gap between the volute and the motor, without installing the shaft seal, water vapor and dust will overflow from the volute and contact the motor, thereby causing corrosion of the motor bearing and reducing the product life.

[0004] The existing sealing structure is usually installed between the rotating shaft of the motor and the flange connected to the volute. The contact area between the sealing structure and the rotating shaft is usually large, which easily causes wear of the sealing structure and then leads to the failure of the sealing structure.

[0005] Therefore, how to reduce the frictional resistance between the sealing structure and the rotating shaft on the basis of realizing the sealing performance to enhance the service life of the sealing structure is a technical problem that those skilled in the art need to solve currently. Content of the Utility Model

[0006] The purpose of the utility model is to provide a sealing structure of a fan, which can reduce the frictional resistance between the sealing structure and the rotating shaft on the basis of realizing the sealing performance to enhance the service life of the sealing structure.

[0007] To achieve the above purpose, the utility model provides a sealing structure of a fan, including a volute, an impeller installed inside the volute, a motor and a flange. The two sides of the flange are respectively fixedly connected with the housing of the motor and the volute. The rotating shaft of the motor passes through the flange and the end of the rotating shaft is inserted into the fixing part of the impeller. The sealing structure further includes a sealing member, and the sealing member includes a sealing part facing the rotating shaft and a clamping part facing the flange. The sealing part includes a first extension part and a second extension part which are arranged at intervals and extend to the surface of the rotating shaft. A first annular groove for storing lubricant is formed between the first extension part and the second extension part.

[0008] Preferably, the extending direction of the first extension part is arranged at an angle with the horizontal plane, so that one first corner part at the end of the first extension part away from the clamping part contacts the surface of the rotating shaft, and a first gap is formed between the other first corner part at the end of the first extension part away from the clamping part and the rotating shaft.

[0009] Preferably, the second extension portion includes a first toroidal surface and a second toroidal surface located in the first annular groove. One end of the first toroidal surface and the second toroidal surface that are close to each other are connected to form a second corner portion that fits against the rotating shaft.

[0010] Preferably, a second gap is formed between the first toroidal surface and the rotating shaft.

[0011] Preferably, the flange is provided with a clamping protrusion. The clamping protrusion is located at one end of the flange facing the rotating shaft. The clamping portion includes a first protrusion and a second protrusion that are spaced apart from each other, so that an annular groove is formed on the circumferential surface of the sealing member located between the first protrusion and the second protrusion. The clamping protrusion abuts against the annular groove to limit the axial movement of the sealing member along the rotating shaft.

[0012] Preferably, the circumferential surface of the second protrusion abuts against the inner circumferential surface of the flange, so that the second corner portion abuts against the outer circumferential surface of the rotating shaft.

[0013] Preferably, the sealing member includes a bottom surface facing the housing of the motor. The bottom surface is connected to the first toroidal surface, and a third gap communicating with the second gap is formed between the bottom surface and the motor.

[0014] Preferably, the circumferential surface of the first protrusion includes a first plane and a second plane that are oppositely arranged. The first plane and the second plane are used to limit the rotation of the sealing member around the axis of the rotating shaft.

[0015] Preferably, the lubricant is specifically grease.

[0016] Preferably, the first extension portion includes a third toroidal surface located in the first annular groove. The third toroidal surface and the second toroidal surface are connected and symmetrically arranged.

[0017] Compared with the above background art, the sealing structure of the blower provided by the present utility model includes a volute, an impeller installed inside the volute, a motor, and a flange. The two sides of the flange are respectively fixedly connected to the housing of the motor and the volute. The rotating shaft of the motor passes through the flange and the end of the rotating shaft is inserted into the fixing portion of the impeller. The sealing structure further includes a sealing member. The sealing member includes a sealing portion facing the rotating shaft and a clamping portion facing the flange. The sealing portion includes a first extension portion and a second extension portion that are spaced apart from each other and extend to the surface of the rotating shaft. A first annular groove for storing lubricant is formed between the first extension portion and the second extension portion.

[0018] Specifically, the two sides of the flange are respectively fixedly connected to the housing of the motor and the volute. By arranging the sealing member between the flange and the rotating shaft of the motor, and the sealing portion of the sealing member faces the rotating shaft and the clamping portion of the sealing member faces the flange, the sealing effect between the volute and the motor is realized. The first extension portion and the second extension portion of the sealing portion extending to the surface of the rotating shaft form a first annular groove, which can store more lubricant for reducing the frictional resistance between the sealing member and the rotating shaft. On the basis of realizing the sealing performance, the frictional resistance between the sealing structure and the rotating shaft is reduced to enhance the service life of the sealing structure. Brief Description of the Drawings

[0019] In order 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 the description of 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.

[0020] Figure 1 Structural schematic diagram of the seal provided by the embodiment of the present invention;

[0021] Figure 2 Structural schematic diagram of the seal from another perspective provided by the embodiment of the present invention;

[0022] Figure 3 Structural schematic diagram of the seal installed in the volute provided by the embodiment of the present invention;

[0023] Figure 4 Structural sectional view of the seal installed in the volute provided by the embodiment of the present invention;

[0024] Figure 5 For Figure 4 Partial enlarged view;

[0025] Figure 6 For Figure 5 Partial enlarged view at position A in

[0026] Wherein:

[0027] 100 - Volute;

[0028] 200 - Impeller;

[0029] 300 - Motor, 310 - Rotating shaft;

[0030] 400 - Flange, 410 - Clamping protrusion;

[0031] 500 - Seal, 510 - Sealing part, 511 - First extension part, 5111 - Third toroidal surface, 512 - Second extension part, 5121 - First toroidal surface, 5122 - Second toroidal surface, 5123 - Second gap, 513 - First annular groove, 520 - Clamping part, 521 - First protrusion, 5211 - First plane, 5212 - Second plane, 522 - Second protrusion, 523 - Annular groove. Detailed Description of the Preferred Embodiments

[0032] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0033] In order to enable those skilled in the art of this technology to better understand the solution of the present utility model, the present utility model will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0034] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "top" and "bottom" is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the indicated position or element must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation of the present utility model.

[0035] The purpose of the present utility model is to provide a sealing structure for a fan, which can reduce the frictional resistance between the sealing structure and the rotating shaft on the basis of achieving the sealing performance, so as to enhance the service life of the sealing structure.

[0036] Please refer to Figure 3 and Figure 4 , to achieve the above purpose, the present utility model provides a sealing structure for a fan, including a volute 100, an impeller 200 installed inside the volute 100, a motor 300, and a flange 400. The two sides of the flange 400 are respectively fixedly connected to the housing of the motor 300 and the volute 100. The rotating shaft 310 of the motor 300 passes through the flange 400 and the end of the rotating shaft 310 is inserted into the fixing part of the impeller 200. The sealing structure further includes a seal 500. The seal 500 includes a sealing part 510 facing the rotating shaft 310 and a clamping part 520 facing the flange 400. The sealing part 510 includes a first extension part 511 and a second extension part 512 that are spaced apart and extend to the surface of the rotating shaft 310. A first annular groove 513 for storing lubricant is formed between the first extension part 511 and the second extension part 512.

[0037] It can be understood that the seal 500 is arranged between the flange 400 and the rotating shaft 310 of the motor 300 to restrict the dust and moisture in the volute 100 from axially moving along the rotating shaft 310 into the interior of the motor 300. The seal 500 is a radial sealing structure. Compared with the axial sealing structure that has relatively high requirements for the dimensional tolerance control of the motor 300, the seal 500 in this embodiment has relatively low requirements for the dimensional tolerance of the shaft extension size, which is convenient for the production of the motor 300 products.

[0038] Please refer toFigure 5 Among them, the assembly process of the seal 500 is as follows: First, install the seal 500 on the flange 400 connected to the volute 100. Then, apply lubricant to the first annular groove 513 formed by the first extension 511 and the second extension 512. After that, assemble the motor 300 to the designated position so that the seal 500 can achieve a sealing effect. Then, assemble the remaining sub-components of the fan.

[0039] Both sides of the flange 400 are fixedly connected to the housing of the motor 300 and the volute 100 respectively. By arranging the seal 500 between the flange 400 and the rotating shaft 310 of the motor 300, and the sealing portion 510 of the seal 500 faces the rotating shaft 310, and the clamping portion 520 of the seal 500 faces the flange 400, the sealing effect between the volute 100 and the motor 300 is achieved. The first annular groove 513 is formed by the first extension 511 and the second extension 512 extending to the surface of the rotating shaft 310, which can store more lubricant for reducing the frictional resistance between the seal 500 and the rotating shaft 310, and reduce the frictional resistance between the sealing structure and the rotating shaft 310 on the basis of achieving the sealing performance, so as to enhance the service life of the sealing structure.

[0040] It should be noted that the first annular groove 513 formed by the first extension 511 and the second extension 512 in this embodiment has a large accommodation space. Compared with the space for placing lubricant in the prior art, the first annular groove 513 can store 5-10 times more lubricant than before. Both the first extension 511 and the second extension 512 extend to the surface of the rotating shaft 310, which can slow down the loss of lubricant while significantly improving the sealing performance of the seal 500.

[0041] The lubricant can be grease. The first extension 511 and the second extension 512 can reduce the volatilization process of the grease. The specific type of the grease can be adjusted according to the actual situation and is not specifically limited here as long as the above purpose can be achieved.

[0042] In this embodiment, the extending direction of the first extension 511 is set at an angle with the horizontal plane. Here, the horizontal plane refers to any plane perpendicular to the axis of the rotating shaft 310 when the rotating shaft 310 in the attachment Figure 6 is vertically arranged. By setting the extending direction of the first extension 511 at an angle with the horizontal plane, one first corner at the end of the first extension 511 away from the clamping portion 520 contacts the surface of the rotating shaft 310, and a first gap is formed between the other first corner at the end of the first extension 511 away from the clamping portion 520 and the rotating shaft 310.

[0043] By contacting the rotatable shaft 310 at the corner, the contact area between the first extension 511 and the shaft 310 can be reduced, thereby reducing the frictional resistance between the first extension 511 and the shaft 310. While increasing the service life of the seal 500, it can prevent the motor 300 from failing to start due to excessive frictional resistance.

[0044] The angle between the extending direction of the first extension 511 and the horizontal plane is preferably 30° - 60°. The angle between the extending direction of the first extension 511 and the horizontal plane and the thickness of the first extension 511 can both be adjusted according to the strength requirement of contacting the shaft 310, as long as the above object can be achieved.

[0045] Please refer to Figure 6 , the second extension 512 includes a first toroidal surface 5121 and a second toroidal surface 5122 located in the first annular groove 513. The first toroidal surface 5121 and the second toroidal surface 5122 form the outer wall surface of the second extension 512. The adjacent ends of the first toroidal surface 5121 and the second toroidal surface 5122 are connected to form a second corner portion that fits on the shaft 310.

[0046] Among them, the adjacent ends of the first toroidal surface 5121 and the second toroidal surface 5122 are both the ends closer to the shaft 310 in the first toroidal surface 5121 and the second toroidal surface 5122. Through the connection of the adjacent ends of the first toroidal surface 5121 and the second toroidal surface 5122, a second corner portion with a tapered structure is formed, and the smaller end of the second corner portion fits on the surface of the shaft 310. The contact area between the second extension 512 and the shaft 310 can be reduced, thereby reducing the frictional resistance between the second extension 512 and the shaft 310. While increasing the service life of the seal 500, it can also prevent the motor 300 from failing to start due to excessive frictional resistance.

[0047] It should be noted that a first gap is formed between another first corner portion at the end of the first extension 511 away from the clamping portion 520 and the shaft 310, and a second gap 5123 is formed between the first toroidal surface 5121 and the shaft 310. Through the settings of the first gap and the second gap 5123, while reducing the contact area between the sealing portion 510 and the shaft 310, the material usage of the seal 500 can be reduced, which is beneficial to cost savings.

[0048] Please refer to Figure 2, in this embodiment, the flange 400 is provided with a clamping protrusion 410. The clamping protrusion 410 is located at one end of the flange 400 facing the rotating shaft 310. The clamping portion 520 includes a first protrusion 521 and a second protrusion 522 which are arranged at intervals. Through the arrangement of the first protrusion 521 and the second protrusion 522, an annular groove 523 is formed on the outer circumferential surface of the sealing member 500 located between the first protrusion 521 and the second protrusion 522. The inner side surface of the clamping protrusion 410 abuts against the annular groove 523 to limit the axial movement of the sealing member 500 along the rotating shaft 310.

[0049] Wherein, the circumferential surface of the second protrusion 522 can abut against the inner circumferential surface of the flange 400. Through the inner circumferential surface of the flange 400, the limit position of the circumferential surface of the second protrusion 522 can be restricted, and at the same time, the second corner portion can abut against the outer circumferential surface of the rotating shaft 310.

[0050] In addition, the sealing member 500 includes a bottom surface facing the housing of the motor 300. The bottom surface is connected to the first annular surface 5121, and a third gap communicating with the second gap 5123 is formed between the bottom surface and the motor 300. Through the arrangement of the third gap, when the rotating shaft 310 starts to rotate and drives the sealing member 500 to have a movement tendency, the friction between the sealing member 500 and the motor 300 can be avoided, thereby avoiding the wear of the sealing member 500 and increasing the service life of the sealing member 500.

[0051] It should be noted that a part of the circumferential surface of the second protrusion 522 is located between the flange 400 and the housing of the motor 300. The side of the second protrusion 522 close to the housing of the motor 300 is the bottom surface of the sealing member 500, and this bottom surface is a plane to avoid the contact between the sealing member 500 and the motor 300 caused by installation errors. At the same time, both the opposite sides of the first protrusion 521 and the second protrusion 522 are planes that can abut against the side surface of the clamping protrusion 410, ensuring that the sealing member 500 is installed in place and is stable relative to the flange 400.

[0052] Please refer to Figure 1 , considering that the sealing member 500 is a static sealing structure, in order to prevent the sealing member 500 from rotating with the rotating shaft 310, the circumferential surface of the first protrusion 521 includes a first plane 5211 and a second plane 5212 which are oppositely arranged. Through the abutting member abutting against the first plane 5211 and / or the second plane 5212, the rotation of the sealing member 500 around the axis of the rotating shaft 310 can be restricted.

[0053] In this embodiment, the first extension portion 511 includes a third annular surface 5111 located in the first annular groove 513. The third annular surface 5111 is connected to the second annular surface 5122 and is symmetrically arranged.

[0054] The inner wall of the first annular groove 513 is formed by connecting the third toroidal surface 5111 and the second toroidal surface 5122. When the third toroidal surface 5111 and the second toroidal surface 5122 are symmetrically arranged with respect to the plane of the circular ring formed by their connection, a ring groove structure with a cross-section approximately triangular can be formed between the third toroidal surface 5111, the second toroidal surface 5122 and the surface of the rotating shaft 310, which is beneficial to accommodating more grease, can further reduce the leakage of the fan pressure, and improves the performance of the fan.

[0055] In summary, the present utility model provides a sealing structure for a fan, including a seal 500. The seal 500 includes a sealing portion 510 facing the rotating shaft 310 and a clamping portion 520 facing the flange 400. The sealing portion 510 includes a first extension portion 511 and a second extension portion 512 that are spaced apart and extend to the surface of the rotating shaft 310. A first annular groove 513 for storing lubricant is formed between the first extension portion 511 and the second extension portion 512. The extending direction of the first extension portion 511 is set at an angle with the horizontal plane, so that a first corner of one end of the first extension portion 511 facing away from the clamping portion 520 contacts the surface of the rotating shaft 310, and a first gap is formed between the other first corner of the first extension portion 511 facing away from the clamping portion 520 and the rotating shaft 310. The second extension portion 512 includes a first toroidal surface 5121 and a second toroidal surface 5122 located in the first annular groove 513. The adjacent ends of the first toroidal surface 5121 and the second toroidal surface 5122 are connected to form a second corner that fits on the rotating shaft 310.

[0056] Through the design of the first corner and the second corner, the contact area between the seal 500 and the rotating shaft 310 is smaller, reducing the frictional resistance. Without affecting the normal starting ability of the motor 300, it can prevent the motor 300 from not starting due to excessive resistance; through the design of the first annular groove 513, 5-10 times more grease can be stored, and the first extension portion 511 and the second extension portion 512 also slow down the loss of grease, greatly improving the sealing performance; the design of the seal 500 is for radial sealing, with lower tolerance requirements for the shaft extension size, facilitating the production of the motor 300 product; reducing the leakage of the fan pressure and improving the performance of the fan; effectively reducing the overflow of dust and moisture in the volute 100, thereby protecting the motor 300 bearing.

[0057] It should be noted that in this specification, relational terms such as first and second are only used to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0058] The various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0059] In this article, specific examples are used to elaborate on the principle and implementation manner of the present utility model. The description of the above embodiments is only used to help understand the method and its core idea of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present utility model, several improvements and modifications can still be made to the present utility model, and these improvements and modifications also fall within the protection scope of the present utility model.

Claims

1. A sealing structure of a fan, comprising a volute, an impeller installed inside the volute, a motor and a flange, wherein the two sides of the flange are respectively fixedly connected to the housing of the motor and the volute, the rotating shaft of the motor is passed through the flange and the end of the rotating shaft is inserted into the fixing part of the impeller, characterized in that: It also includes a sealing member, which includes a sealing portion facing the rotating shaft and a clamping portion facing the flange, and the sealing portion includes a first extension portion and a second extension portion that are arranged at intervals and extend to the surface of the rotating shaft, and a first annular groove for storing lubricant is formed between the first extension portion and the second extension portion.

2. The sealing structure of the fan according to claim 1, characterized in that: The extension direction of the first extension portion is set at an angle to the horizontal plane, so that a first corner of the first extension portion at one end away from the clamping portion contacts the surface of the rotating shaft, and a first gap is formed between the other first corner of the first extension portion at one end away from the clamping portion and the rotating shaft.

3. The sealing structure of the fan according to claim 2, characterized in that: The second extension portion includes a first annular surface and a second annular surface located in the first annular groove, and the first annular surface and the second annular surface are connected at adjacent ends to form a second corner portion that fits the rotating shaft.

4. The sealing structure of the fan according to claim 3, characterized in that: A second gap is formed between the first annular surface and the rotating shaft.

5. The sealing structure of the fan according to claim 3, characterized in that: The flange is provided with a clamping protrusion, which is located at one end of the flange facing the rotating shaft. The clamping portion includes a first protrusion and a second protrusion arranged at an interval, so that the circumferential surface of the seal located between the first protrusion and the second protrusion forms an annular groove, and the clamping protrusion abuts against the annular groove to limit the axial movement of the seal along the rotating shaft.

6. The sealing structure of the fan according to claim 5, characterized in that: The circumferential surface of the second protrusion abuts against the inner circumferential surface of the flange, so that the second corner abuts against the outer circumferential surface of the rotating shaft.

7. The sealing structure of the fan according to claim 4, characterized in that: The sealing member includes a bottom surface facing the housing of the motor, the bottom surface is connected to the first annular surface, and a third gap communicating with the second gap is formed between the bottom surface and the motor.

8. The sealing structure of the fan according to claim 5, characterized in that: The circumferential surface of the first protrusion includes a first plane and a second plane that are arranged opposite to each other, and the first plane and the second plane are used to limit the sealing member from rotating around the axis of the rotating shaft.

9. The sealing structure of the fan according to claim 1, characterized in that: The lubricant is specifically grease.

10. The sealing structure of the fan according to claim 3, characterized in that: The first extension portion includes a third annular surface located in the first annular groove, and the third annular surface is connected to the second annular surface and is symmetrically arranged.

Images