Dust cover structure of impeller and negative pressure fan with dust cover structure

Abstract

A clamping groove is formed in the position, correspondingly close to an opening in the front end of a shaft hole, of the inner wall of the shaft hole of a wheel body, an extending part capable of extending into the shaft hole is arranged on a cover body, and a hook part capable of entering the clamping groove is further arranged on the side, close to the inner wall of the shaft hole, of the extending part. When the cover body is assembled, force is applied to press the cover body, the front end opening of the shaft hole makes contact with the hook part to force the extending part to deform, the hook part moves in the direction away from the inner wall of the shaft hole, the extending part can stretch into the shaft hole, and the hook part elastically abuts against the inner wall of the shaft hole. Meanwhile, the hook part can be gradually close to and finally enter the clamping groove along with the process that the extending part extends into the shaft hole, so that the cover body is limited to be separated from the wheel body through matching of the hook part and the clamping groove, rapid assembly of the wheel body and the cover body is achieved, the cover body can be assembled on the wheel body by applying force to press the cover body, operation is easy and rapid, and the assembly efficiency is improved; the time cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of negative pressure fans, in particular to a dust cover structure of an impeller. Background Art

[0002] The existing negative pressure fan blade structure includes an impeller and multiple blades. The blades and the impeller are separate and are produced in different production workshops. They are assembled after production is completed.

[0003] For example, the impeller of the negative pressure fan disclosed in utility model patent application No. 202022530076.9 has a through-hole formed at its axis. During installation, a connecting shaft is first installed on the housing of the negative pressure fan, and the bearing is fixed in the through-hole. The connecting shaft is inserted into the through-hole and passes through the bearing, so that the impeller can be pivotally installed on the housing of the negative pressure fan. In order to facilitate the installation of the impeller, both ends of the through-hole are usually open, and the connecting shaft is inserted into the through-hole through one end opening of the through-hole. In order to avoid the accumulation of dust, debris, etc. in the through-hole after the negative pressure fan is used for a long time, after the impeller is installed, a dust cover is added to the opening at the other end of the through-hole for dust prevention.

[0004] The dust cover is connected to the impeller through a threaded fit. After production is completed, the assembly work is performed manually by workers. Due to the threaded fit, the dust cover needs to be rotated a certain number of times before it can be fastened to the impeller. In the face of mass production, the workers turn the dust covers one by one to fasten them to the impeller. This installation method is inefficient and the time cost is increased. Utility Model Content

[0005] The main purpose of the utility model is to propose a dust cover structure for an impeller, aiming to solve the problem that the existing dust cover assembly efficiency is slow and causes increased time cost.

[0006] To achieve the above-mentioned object, the present invention provides a dust cover structure for an impeller, comprising a wheel body and a cover body, wherein an axial hole having a front opening and a rear opening is formed through the axis of the wheel body, the cover body is provided with an extension portion that can extend into the axial hole, a hook portion is provided on a side of the extension portion close to the inner wall of the axial hole, and a slot for the hook portion to enter is provided on the inner wall of the axial hole close to the front opening of the axial hole;

[0007] The front end opening of the shaft hole contacts the hook portion and forces the extension portion to deform so that the hook portion moves away from the inner wall of the shaft hole, so that the extension portion extends into the shaft hole, and the hook portion and the inner wall of the shaft hole maintain elastic resistance while approaching and entering the slot as the extension portion extends into the shaft hole, so that the cover body is restricted from separating from the wheel body through the cooperation between the hook portion and the slot, thereby realizing rapid assembly of the wheel body and the cover body.

[0008] Preferably, three strip-shaped extensions are provided at intervals in an annular shape on one side of the cover body close to the shaft hole, and the hook is provided at the free end of the extension.

[0009] Preferably, the extension portion is annular, and three hook portions are spaced apart and arranged on the outer peripheral wall of the extension portion.

[0010] Preferably, the number of the card slots is one or more. When there are more than one card slots, the number of the card slots corresponds to the number of the hooks. When there is only one card slot, the card slot is an annular structure coaxial with the shaft hole.

[0011] Preferably, the front end opening of the shaft hole is provided with a first inclined surface, and the hook portion is provided with a second inclined surface for contacting the first inclined surface.

[0012] Preferably, the number of the first inclined surfaces is one or more. When there are more than one first inclined surfaces, the number of the first inclined surfaces corresponds to the number of the hook portions. When there is one first inclined surface, the first inclined surface is an annular structure coaxial with the shaft hole.

[0013] Preferably, the cover body, the extension portion and the hook portion are all made of plastic.

[0014] Preferably, the cover body, the extension portion and the hook portion are an integrally formed structure.

[0015] The utility model also provides a negative pressure fan, comprising a dust cover structure of an impeller, wherein the dust cover structure of the impeller is the dust cover structure of the impeller described above.

[0016] The technical solution of the present invention is to provide a card slot on the inner wall of the shaft hole of the wheel body corresponding to the position close to the front end opening of the shaft hole, and to provide an extension part that can be extended into the shaft hole on the cover body, and to provide a hook part that can enter the card slot on the side of the extension part close to the inner wall of the shaft hole. When assembling the cover body, force is applied to press the cover body so that it contacts the hook part through the front end opening of the shaft hole to force the extension part to deform, so that the hook part moves in the direction away from the inner wall of the shaft hole, so that the extension part can be extended into the shaft hole, and the hook part and the inner wall of the shaft hole maintain elastic resistance. At the same time, the hook part can also gradually approach and finally enter the card slot as the extension part extends into the shaft hole, so that the cover body is limited to be separated from the wheel body by cooperation between the hook part and the card slot, thereby realizing rapid assembly of the wheel body and the cover body. Compared with the traditional method, the present invention can assemble the cover body on the wheel body by applying force to press the cover body, and the assembly operation is very simple and quick, which effectively improves the assembly efficiency, thereby reducing the time cost of batch assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is the assembly drawing of the wheel body and the cover body;

[0018] Figure 2 It is a three-dimensional diagram of the wheel body and the cover body;

[0019] Figure 3is a three-dimensional diagram of the cover;

[0020] Figure 4 Schematic diagram of negative pressure fan. DETAILED DESCRIPTION

[0021] The following will be combined with the accompanying drawings to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0022] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, top, bottom, inside, outside, vertical, horizontal, longitudinal, counterclockwise, clockwise, circumferential, radial, axial...), then the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0023] In addition, if there are descriptions involving "first" or "second" in the embodiments of the present invention, the descriptions of "first" or "second" are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features specified as "first" or "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that ordinary technicians in this field can implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0024] The utility model provides a dust cover structure for an impeller.

[0025] In the embodiment of the present utility model, Figures 1 to 3 As shown, the dust cover structure of the impeller includes a wheel body 1 and a cover body 2. The wheel body 1 is provided with an axial hole 11 with a front opening and a rear opening at the axis center. The characteristic is that: the cover body 2 is provided with an extension portion 21 that can extend into the axial hole 11, and a hook portion 22 is provided on a side of the extension portion 21 close to the inner wall of the axial hole 11. The inner wall of the axial hole 11 is provided with a slot 12 for the hook portion 22 to enter at a position close to the front opening of the axial hole 11;

[0026] The front end opening of the shaft hole 11 contacts the hook portion 22 and forces the extension portion 21 to deform so that the hook portion 22 moves away from the inner wall of the shaft hole 11, so that the extension portion 21 extends into the shaft hole 11, and the hook portion 22 and the inner wall of the shaft hole 11 maintain elastic resistance while approaching and entering the slot 12 as the extension portion 21 extends into the shaft hole 11, so that the cover body 2 can be restricted from being separated from the wheel body 1 by the cooperation between the hook portion 22 and the slot 12, thereby realizing rapid assembly of the wheel body 1 and the cover body 2.

[0027] In this embodiment, if Figure 2 As shown, three strip-shaped extensions 21 are annularly spaced apart on one side of the cover body 2 close to the shaft hole 11 , and the hook 22 is provided at the free end of the extension 21 .

[0028] In another embodiment, if Figure 3 As shown, the extension portion 21 is annular, and three hook portions 22 are spaced apart and arranged on the outer peripheral wall of the extension portion 21 .

[0029] Specifically, there are one or more slots 12 . When there are more than one slots 12 , the number of the slots 12 corresponds to the number of the hooks 22 . When there is only one slot 12 , the slot 12 is an annular structure coaxial with the shaft hole 11 .

[0030] Specifically, the front end opening of the shaft hole 11 is provided with a first inclined surface 13, and the hook portion 22 is provided with a second inclined surface 23 for contacting the first inclined surface 13. When the cover body 2 is assembled, the first inclined surface 13 and the second inclined surface 23 cooperate to make the extension portion 21 more easily deformable, thereby allowing the extension portion 21 to smoothly enter the shaft hole 11.

[0031] Specifically, there are one or more first inclined surfaces 13 . When there are more than one first inclined surfaces 13 , the number of the first inclined surfaces 13 corresponds to the number of the hooks 22 . When there is only one first inclined surface 13 , the first inclined surface 13 is an annular structure coaxial with the shaft hole 11 .

[0032] Specifically, the cover body 2 , the extension portion 21 and the hook portion 22 are all made of plastic.

[0033] Specifically, the cover body 2, the extension portion 21 and the hook portion 22 are an integrally formed structure.

[0034] The present utility model also proposes a negative pressure fan, including a dust cover structure for an impeller. For the specific structure of the dust cover structure for the impeller, please refer to the above-mentioned embodiment. Since the present negative pressure fan adopts all the technical solutions of all the embodiments of the above-mentioned dust cover structure for the impeller, it at least has all the beneficial effects brought about by the technical solutions of the above-mentioned dust cover structure for the impeller, which will not be described one by one here.

[0035] The technical solution of the present invention is to provide a card slot on the inner wall of the shaft hole of the wheel body corresponding to the position close to the front end opening of the shaft hole, and to provide an extension part that can be extended into the shaft hole on the cover body, and to provide a hook part that can enter the card slot on the side of the extension part close to the inner wall of the shaft hole. When assembling the cover body, force is applied to press the cover body so that it contacts the hook part through the front end opening of the shaft hole to force the extension part to deform, so that the hook part moves in the direction away from the inner wall of the shaft hole, so that the extension part can be extended into the shaft hole, and the hook part and the inner wall of the shaft hole maintain elastic resistance. At the same time, the hook part can also gradually approach and finally enter the card slot as the extension part extends into the shaft hole, so that the cover body is limited to be separated from the wheel body by cooperation between the hook part and the card slot, thereby realizing rapid assembly of the wheel body and the cover body. Compared with the traditional method, the present invention can assemble the cover body on the wheel body by applying force to press the cover body, and the assembly operation is very simple and quick, which effectively improves the assembly efficiency, thereby reducing the time cost of batch assembly.

[0036] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made by using the contents of the present invention specification and drawings under the utility model concept, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A dust cover structure for an impeller, comprising a wheel body (1) and a cover body (2), wherein an axial hole (11) having a front opening and a rear opening is formed through the axis of the wheel body (1), and is characterized in that: The cover body (2) is provided with an extension portion (21) that can extend into the shaft hole (11), a hook portion (22) is provided on one side of the extension portion (21) close to the inner wall of the shaft hole (11), and a slot (12) for the hook portion (22) to enter is provided on the inner wall of the shaft hole (11) close to the front end opening of the shaft hole (11); The front end opening of the shaft hole (11) contacts the hook portion (22) and forces the extension portion (21) to deform, causing the hook portion (22) to move in a direction away from the inner wall of the shaft hole (11), so that the extension portion (21) extends into the shaft hole (11), and the hook portion (22) and the inner wall of the shaft hole (11) maintain elastic contact, and can approach and enter the clamping groove (12) as the extension portion (21) extends into the shaft hole (11), so that the cover body (2) is restricted from being separated from the wheel body (1) by the cooperation between the hook portion (22) and the clamping groove (12), thereby realizing rapid assembly of the wheel body (1) and the cover body (2).

2. The impeller dust cover structure according to claim 1, characterized in that: Three strip-shaped extensions (21) are provided at intervals on one side of the cover body (2) close to the shaft hole (11), and the hook (22) is provided at the free end of the extension (21).

3. The impeller dust cover structure according to claim 1, characterized in that: The extension portion (21) is annular, and three hook portions (22) are spaced apart and arranged on the outer peripheral wall of the extension portion (21).

4. The impeller dust cover structure according to claim 1, characterized in that: The card slot (12) is one or more. When there are more than one card slot, the number of the card slots (12) corresponds to the number of the hooks (22). When there is only one card slot, the card slot (12) is an annular structure coaxial with the shaft hole (11).

5. The impeller dust cover structure according to claim 1, characterized in that: The front end opening of the shaft hole (11) is provided with a first inclined surface (13), and the hook portion (22) is provided with a second inclined surface (23) for contacting the first inclined surface (13).

6. The impeller dust cover structure according to claim 5, characterized in that: The first inclined surface (13) is one or more. When there are more than one first inclined surface (13), the number of the first inclined surfaces (13) corresponds to the number of the hook portions (22). When there is one first inclined surface (13), the first inclined surface (13) is an annular structure coaxial with the shaft hole (11).

7. The impeller dust cover structure according to claim 1, characterized in that: The cover body (2), the extension portion (21) and the hook portion (22) are all made of plastic.

8. The impeller dust cover structure according to claim 1, characterized in that: The cover body (2), the extension portion (21) and the hook portion (22) are an integrally formed structure.

9. A negative pressure fan, characterized in that: The impeller dust cover structure according to any one of claims 1 to 8.

Images