TWI381104B - Fan snap rivet - Google Patents

Description

Fan rivet

The present invention relates to a resilient rivet for securing a fan unit to a machine table, and more particularly to a function that can be quickly assembled and has the function of blocking fan vibration.

Conventionally, in order to fix a fan device to a casing, the easiest way is to fix the fan device and the reserved hole on the casing by screws, which is easy to cause the fan device to operate. The vibration generated during the operation affects the performance of other components in the casing, especially for network-type servers. This is because the computing speed of the server is often much higher than that of the single computer of the terminal, and relatively speaking, it has higher requirements for the heat dissipation condition. In order to improve the heat dissipation efficiency, the most direct method is to install a plurality of cooling fans capable of running at a high speed on the server, but also relatively greatly increase the vibration energy generated when the cooling fans are operated, indirectly damaging adjacent ones. Hard disk drive.

Taiwan Patent No. M276259 discloses a conventional shock absorbing member for absorbing vibration generated by the operation of a heat radiating fan to avoid affecting the performance of components connected to the fan. The shock absorbing element is made of a soft material and includes a connecting portion and a shock absorbing portion. The connecting portion is configured to be disposed in a connecting hole of a fan frame, and the shock absorbing portion is configured to be engaged with a card slot on a casing of the fan seat. The shock absorbing portion has a groove segment that can be engaged with the corresponding card slot, and a shockproof pad that is connected to the groove segment and abuts between the casing and the fan frame. The patent mainly utilizes multiple elastic shock absorbing components A plurality of fan frames are fixed in the fan holder to buffer vibration generated by the operation of the motor fan in the fan frame. However, the shock absorbing element of the patent is in close contact with the wall surfaces of the fan frame and the fan holder, so that the contact area is large, and the vibration conduction effect is also large, which is disadvantageous for blocking the vibration of the fan.

The present invention provides an elastic rivet capable of mitigating vibrations caused by the operation of a fan, which has better vibration damping performance than conventional elastic rivets.

Thus, the elastic rivet of the present invention comprises a rod body, and a stop portion, a convex ring and a shaft cap which are radially protruded from the surface of the rod body and are sequentially arranged along the axial direction of the rod body. The rivet is integrally formed of an elastic material and is used for axially penetrating a reserved hole of a fan device and a reserved hole of a casing for fixing the fan device to the casing. In particular, the elastic rivet is used to contact the fan device or at least one surface of the casing is formed with a plurality of protrusions.

Compared with the prior art, the elastic rivet of the present invention utilizes the raised portions to reduce the contact area of the elastic rivet with the fan device and/or the casing, thereby mitigating vibration conduction to achieve a vibration-damping effect.

Other inventive aspects and more detailed technical and functional descriptions of the present invention are disclosed in the following description.

The first to third figures show a preferred example of the elastic rivet 1 of the present invention. As shown in the first figure, four elastic rivets 1 are used to fix a fan device 2 to a casing 3 for reducing the electronic components in the casing 3. The member (not shown) is damaged by the vibration caused by the operation of the fan unit 2.

As shown in the second figure, each elastic rivet 1 includes a rod body 10, and a stop portion 11 and a convex portion that protrudes radially from the surface of the rod body 10 and are sequentially arranged along the axial direction of the rod body 10. Ring 12 and a shaft cap 13. In addition, the entirety of each elastic rivet is mainly composed of an elastic material such as rubber to have appropriate flexibility. Referring to the first and third figures, the assembly can first pass the stop portion 11 of the front end of the elastic rivet 1 through the reserved hole 20 at the corner of the fan device 2, and then the shaft cap 13 at the rear end of the elastic rivet 1 The card is disposed outside the reserved hole 30 of the casing 3, as shown in the third figure. When the elastic rivet 1 is interposed between the fan device 2 and the casing 3, the stop portion 11 is abutted against an inner wall 21 of the fan device 2, and the convex ring 12 is sandwiched between the fan device An outer wall 22 of the casing 2 is spaced from an outer wall 32 of the casing 3, and the shaft cap 13 is an inner wall 31 of the casing 3. Thereby, the fan device 2 and the casing 3 can be respectively coupled to both sides of the convex ring 12 of each elastic rivet 1. Moreover, the fan device 2 can be suspended on one side of the casing 1 by the fixing of the four elastic rivets 1.

Referring to the second figure, the convex ring 12 of the elastic rivet 1 has a first contact surface 121 and a second contact surface 122 opposite to each other. The first contact surface 121 of the collar 12 faces a third contact surface 111 of the stop portion 11. The second contact surface 122 of the collar 12 faces a fourth contact surface 131 of the shaft cap 13 . The elastic rivet 1 is for contacting the fan device 2 or at least one surface of the casing 3 to form a plurality of protrusions 4 arranged in a zigzag pattern. In this embodiment, the surface of the plurality of raised portions 4 refers to the first contact surface 121 and the second contact surface 122 of the convex ring 12, the third contact surface 111 of the stop portion 11, and the shaft The fourth contact surface 131 of the cap 13. The plurality of raised portions 4 on the first and third contact faces 121, 111 can lower the elastic rivet 1 and the The contact area of the fan device 2; and the plurality of raised portions 4 on the second and fourth contact faces 122, 131 can lower the contact area of the elastic rivet 1 with the casing 3. In this way, the raised portions 4 can reduce the vibration conduction to achieve the vibration isolation effect.

In order to analyze the vibration isolation effect of the zigzag-shaped convex portions 4, two elastic rivets 1 including serrated protrusions 4 are taken for simulation test, which are respectively mounted on an inverted T-shaped mechanism 7. As shown in the fourth figure, and connected to a computer aided analysis software tool, such as the Radioss calculation analysis software tool. The simulation of the vibration isolation effect assumes that both rear ends of the two elastic rivets 1 are excitation sources, and a front end of the base 70 of the inverted T-shaped mechanism 7 is an observation point, and the excitation source is simulated. A vibration causes a change in the displacement of the observation point. Further, a pair of elastic rivets (not shown) having no projections 4 and having the same material as the elastic rivets 1 of the present invention were arranged as a control, and a simulation test of the same conditions was carried out. Thus, under the simulation test of the computer-aided analysis software tool, the simulation results as shown in the fifth and sixth figures are respectively obtained.

The fifth figure shows the simulation results of the two elastic rivets 1 of the present invention, and the maximum displacement amount in the Y direction is 3.06e-8 mm. Conversely, as shown in the sixth figure, the maximum displacement of the control group without the raised portion in the Y direction was as high as 4.95e-8 mm. Accordingly, it is presumed that the elastic rivet of the zigzag-like convex portion 4 of the present invention can reduce the displacement of the mechanism in the Y direction in the single point under the action of vibration, so that the vibration isolation effect can be improved.

Incidentally, although the boss portion 4 in the present embodiment is a zigzag rib, it is not limited thereto. In other examples, the raised portions 4 may also be an array of dots of a plurality of bumps. It is important to reduce the contact area with the fan device and/or the chassis to thereby block vibration conduction.

Referring to Figures 7 and 8, a preferred embodiment of the resilient rivet 5 of the present invention is shown. As shown in the seventh embodiment, the components of the preferred embodiment are substantially the same as those described in the second embodiment, including a rod 50, and projecting radially from the surface of the rod 50 and along the axis of the rod 50. A stop portion 51, a convex ring 52 and a shaft cap 53 are arranged in sequence. However, in the preferred embodiment, the elastic rivet 5 has two sections on the cylindrical surface of the rod 50 in addition to the lateral protrusions 4, and the two sections are parallel and extend in the axial direction of the rod 50. The raised portions 6 respectively correspond to the peripheral wall of the reserved hole 20 of the fan device 2 and the peripheral wall of the reserved hole 30 of the casing 3. As shown in FIG. 8 , when the elastic rivet 5 is disposed between the fan device 2 and the casing 3 , the protrusions 6 can further serve to reduce the fan device 2 and the casing 3 . The contact area, therefore, can also increase the damping effect.

From the above description, it can be understood that the elastic rivet of the present invention not only has the functions of fixing and damping, but also is easy to assemble. In particular, the plurality of projections of the elastic rivet are carefully designed to reduce vibration transmission under a small contact area for superior shock absorption.

In any event, anyone can obtain sufficient teaching from the description of the above examples, and it is understood that the present invention is indeed different from the prior art, and is industrially usable and progressive. It is the invention that has indeed met the patent requirements and has filed an application in accordance with the law.

1‧‧‧Flexible rivets

10‧‧‧ rod body

11‧‧‧Departure

111‧‧‧ third contact surface

12‧‧‧ convex ring

121‧‧‧First contact surface

122‧‧‧Second contact surface

13‧‧‧ shaft cap

131‧‧‧Four contact surface

2‧‧‧Fan device

20‧‧‧Reserved holes

21‧‧‧ inner wall

22‧‧‧ outer wall

3‧‧‧Chassis

30‧‧‧Reserved holes

31‧‧‧ inner wall

32‧‧‧ outer wall

4‧‧‧ raised parts

50‧‧‧ rod body

51‧‧‧stop section

52‧‧‧ convex ring

53‧‧‧ shaft cap

6‧‧ ‧ raised parts

7‧‧‧Inverted T-type mechanism

70‧‧‧Base

In the first figure, a preferred embodiment of the elastic rivet of the present invention is applied to an exploded perspective view of a combined fan device and a casing.

The second figure is a schematic view of the elastic rivet of the preferred embodiment.

The third figure is a partial cross-sectional view of the elastic rivet of the preferred embodiment which is disposed through the fan unit and the casing.

The fourth figure shows a schematic view of the serrated two-elastic rivet of the preferred embodiment being erected on a mechanism for performing a vibration isolation effect simulation test.

In the fifth figure, the vibration isolation simulation results of the two elastic rivets of the fourth figure are shown.

The sixth graph shows the vibration isolation simulation effect of the other two non-serrated control groups.

Figure 7 is a schematic view showing another preferred embodiment of the elastic rivet of the present invention.

The eighth figure is a partial cross-sectional view of the elastic rivet of the seventh figure which is disposed through the fan device and the casing.

1‧‧‧Flexible rivets

2‧‧‧Fan device

20‧‧‧Reserved holes

3‧‧‧Chassis

30‧‧‧Reserved holes

Claims (8)

A fan rivet for fixing a fan device to a casing; the fan rivet comprising a rod body and a stop extending radially on the surface of the rod body and sequentially arranged along the axial direction of the rod body And a rivet integrally formed of an elastic material; wherein the fan rivet is configured to contact the fan device or at least one surface of the casing is formed with a plurality of protrusions; The convex ring has a first contact surface and a second contact surface opposite to each other, facing the stop portion and the shaft cap respectively, and the surface having the plurality of convex portions means that the convex ring faces the end The first contact surface of the gear portion, the stop portion has a third contact surface facing the first contact surface of the convex ring; the shaft cap has a fourth contact surface facing the first of the convex rings a contact surface; and the surface having the plurality of protrusions further includes the third and fourth contact surfaces. The fan rivet of claim 1, wherein the surface having the plurality of protrusions further comprises a cylindrical surface of the rod body corresponding to a reserved hole of the fan device or the casing. Zhou wall. The fan rivet according to claim 1, wherein the surface having the plurality of protrusions refers to a cylinder surface of the rod body, which corresponds to a reserved hole of the fan device or the casing. Zhou wall. The fan rivet of claim 1, wherein the plurality of raised portions are arranged in a zigzag shape along the surface. A fan rivet for fixing a fan device to a casing; the fan rivet comprising a rod body and a stop extending radially on the surface of the rod body and sequentially arranged along the axial direction of the rod body a portion, a convex ring and a shaft cap; wherein the fan rivet is used to contact the fan device or a plurality of protrusions are formed on at least one surface of the casing; the protrusions have a first contact surface and a second contact surface opposite to each other, respectively facing the stop portion and the shaft cap, and the above The surface having a plurality of raised portions means that the convex ring faces the first contact surface of the stop portion, and the stop portion has a third contact surface facing the first contact surface of the convex ring; The shaft cap has a fourth contact surface facing the second contact surface of the collar; and the surface having the plurality of protrusions further includes the third and fourth contact surfaces. The fan rivet of claim 5, wherein the surface having the plurality of protrusions further comprises a cylinder surface of the rod body corresponding to the fan device or a reserved hole of the casing Zhou wall. The fan rivet according to claim 5, wherein the surface having the plurality of protrusions refers to a cylinder surface of the rod body, which corresponds to a reserved hole of the fan device or the casing. Zhou wall. The fan rivet of claim 5, wherein the plurality of raised portions are arranged in a zigzag manner along the surface.