An anti-backflow fan and anti-backflow method, a heat dissipation device and a server

Abstract

The application discloses a backflow prevention fan and method, a heat dissipation device and a server, wherein the backflow prevention fan of one embodiment comprises a fan frame and a fan body arranged in the fan frame, and the fan body comprises a fan rotating shaft, a limiting device and a plurality of fan blades arranged on the fan rotating shaft; in a normal operation state, the plurality of fan blades rotate with the rotation of the fan rotating shaft, and are close to the front end surface of the fan rotating shaft under the limiting action of the limiting device; in a stop operation state, the plurality of fan blades stop rotating with the static of the fan rotating shaft, and are close to the rear end surface of the fan rotating shaft under the limiting action of the limiting device and splice to form a windproof barrier. The backflow prevention fan provided by the application controls the fan blades through the limiting device, realizes the heat dissipation demand in the normal operation state and realizes the backflow prevention demand in the stop operation state, and has practical application value.

Description

Technical Field

[0001] This invention relates to the field of server heat dissipation technology, and in particular to an anti-backflow fan and anti-backflow method, a heat dissipation device, and a server. Background Technology

[0002] Currently, servers typically use 4 to 8 fans for cooling to ensure normal operation under certain conditions. Fans are a critical component of servers. Servers require long-term operation and uninterrupted business processes. To ensure long-term stable and reliable operation, the fans support an N+1 design, meaning that even if one fan fails, the system's cooling needs can still be met.

[0003] The current problem is that when the fan fails—that is, when the fan stops operating and the blades no longer rotate—airflow will flow back from the failed fan to the front of the fan, resulting in wasted airflow and inefficient cooling. Existing technology typically adds a backflow preventer behind the fan to block the returning airflow. This method introduces problems including increased cost and reduced operating space between the fan and the server backplane, making maintenance more difficult. Summary of the Invention

[0004] To address at least one of the aforementioned problems, a first aspect of the present invention provides an anti-backflow fan for a server, comprising a fan frame and a fan body disposed within the fan frame, wherein the fan body includes: a fan shaft, a limiting device, and a plurality of fan blades disposed on the fan shaft, wherein...

[0005] In normal operation, the fan body's multiple fan blades rotate with the fan shaft and approach the front end face of the fan shaft under the limiting action of the limiting device.

[0006] When the fan body is not running, the multiple fan blades stop rotating as the fan shaft stops, and under the limiting action of the limiting device, they approach the rear end face of the fan shaft and splice together to form a windproof barrier.

[0007] Furthermore, the limiting device includes a limiting groove disposed on the fan shaft, and the fan blade includes a blade and a blade holder, with the blade holder disposed within the limiting groove;

[0008] When the fan body is in normal operation, the multiple fan blades move closer to the front end face along the limiting groove under the action of centrifugal force and wind pressure.

[0009] When the fan body is not running, the multiple fan blades move along the limiting groove towards the rear end face under the action of the returning airflow and are spliced ​​together to form a windproof barrier.

[0010] Furthermore, the limiting groove includes a first limiting portion disposed near the front end face, and the leaf stalk forms a first stalk portion corresponding to the first limiting portion near the front end face;

[0011] When the fan body is in normal operation, the first shank of the blade shank of the plurality of fan blades abuts against the first limiting part and forms a first preset angle in the horizontal direction perpendicular to the fan shaft.

[0012] Furthermore, one of the first limiting portion and the first handle portion is a recess facing the front end face, and the other of the first limiting portion and the first handle portion is a convex portion facing the front end face.

[0013] Furthermore, the limiting groove includes a second limiting portion disposed near the rear end face, and the leaf stalk forms a second stalk portion corresponding to the second limiting portion near the rear end face;

[0014] When the fan body is not running, the second shank of the blades of the plurality of fan blades abuts against the second limiting part and forms a second preset angle in the horizontal direction perpendicular to the fan shaft, so that the plurality of fan blades are spliced ​​together to form a windproof barrier.

[0015] Furthermore, the limiting device also includes a limiting spring corresponding to each fan blade. One end of the limiting spring is disposed on the rear end face of the fan shaft, and the other end of the limiting spring is disposed on the end of the fan blade near the fan shaft.

[0016] In normal operation, the fan body's multiple fan blades, under the action of centrifugal force and wind pressure, resist the tension of the limiting spring and move along the limiting groove towards the front end face.

[0017] When the fan body is not running, the multiple fan blades, under the action of the returning airflow and the tension of the limiting spring, move along the limiting groove towards the rear end face and splice together to form a windproof barrier.

[0018] Furthermore, the limiting device includes a limiting spring corresponding to each fan blade. One end of the limiting spring is disposed on the rear end face of the fan shaft, and the other end of the limiting spring is disposed on the end of the fan blade near the fan shaft.

[0019] When the fan body is running normally, the multiple fan blades resist the tension of the limiting spring and approach the front end face under the action of centrifugal force and wind pressure.

[0020] When the fan body stops operating, the multiple fan blades approach the rear end face under the action of the returning airflow and the tension of the limiting spring, and splice together to form a windproof barrier.

[0021] A second aspect of the present invention provides a heat dissipation device, including an anti-backflow fan as described in the first aspect.

[0022] A third aspect of the present invention provides a server including the anti-backflow fan as described in the first aspect.

[0023] A fourth aspect of the present invention provides a method for preventing backflow using an anti-backflow fan as described in the first aspect, comprising:

[0024] When the fan body is running normally, multiple fan blades rotate with the rotation of the fan shaft and approach the front end face of the fan shaft under the limiting action of the limiting device;

[0025] When the fan body stops running, the multiple fan blades stop rotating as the fan shaft comes to rest, and under the limiting action of the limiting device, they approach the rear end face of the fan shaft and splice together to form a windproof barrier.

[0026] The beneficial effects of this invention are as follows:

[0027] This invention addresses existing problems by providing an anti-backflow fan, an anti-backflow method, a heat dissipation device, and a server. By controlling the fan blades with a limiting device, the fan blades are positioned close to the front face of the fan during normal operation to meet heat dissipation requirements, and close to the rear face of the fan during shutdown to prevent backflow. This overcomes the problems in existing technologies, effectively improves fan heat dissipation efficiency, and has practical application value. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 A schematic diagram of an anti-backflow fan according to an embodiment of the present invention is shown;

[0030] Figure 2 This diagram shows a schematic of the shaft of an anti-backflow fan according to an embodiment of the present invention;

[0031] Figure 3 A schematic diagram of the fan blades of an anti-backflow fan according to an embodiment of the present invention is shown;

[0032] Figure 4 This diagram illustrates the rotation of the fan blades of an anti-backflow fan according to an embodiment of the present invention.

[0033] Figure 5 This diagram illustrates the blade assembly of an anti-backflow fan according to an embodiment of the present invention.

[0034] Figure 6 A flowchart of an embodiment of the anti-backflow method of the present invention is shown.

[0035] Main component names:

[0036] 10-Fan frame 111-Blade holder 112-Fan blade 12-Fan shaft

[0037] 121 - Rear end face; 123 - Limiting groove; 124 - Limiting spring Detailed Implementation

[0038] To more clearly illustrate the present invention, the following description, in conjunction with preferred embodiments and accompanying drawings, further explains the invention. Similar components in the drawings are indicated by the same reference numerals. Those skilled in the art should understand that the specific description below is illustrative rather than restrictive and should not be construed as limiting the scope of protection of the present invention.

[0039] To address the problems existing in the current technology, such as Figure 1 As shown, one embodiment of the present invention provides an anti-backflow fan for a server, including a fan frame 10 and a fan body disposed within the fan frame 10. The fan body includes a fan shaft 12, a limiting device, and a plurality of fan blades disposed on the fan shaft 12. In normal operation, the plurality of fan blades rotate with the fan shaft 12 and approach the front end face of the fan shaft under the limiting action of the limiting device. In a stopped operation state, the plurality of fan blades stop rotating with the fan shaft and approach the rear end face 121 of the fan shaft under the limiting action of the limiting device, and are spliced ​​together to form a windproof barrier.

[0040] In this embodiment, the anti-backflow fan controls the fan blades through a limiting device. In normal operation, the fan blades are brought close to the front face of the fan to achieve efficient heat dissipation. In the off-state, the fan blades are brought close to the rear face of the fan to achieve anti-backflow. This overcomes the problems existing in the prior art and effectively improves the fan's heat dissipation efficiency.

[0041] In a specific example, such as Figure 1 and Figure 2As shown, the limiting device includes a limiting groove 123 disposed on the fan shaft 12, and the fan blades include blades 112 and blade holders 111, with the blade holders 111 disposed within the limiting groove 123. In normal operation, the fan body's multiple fan blades, under the action of centrifugal force and wind pressure, move along the limiting groove towards the front end face. In a stopped state, the multiple fan blades, under the action of the returning airflow, move along the limiting groove towards the rear end face 121 and interlock to form a windproof barrier. Figure 3 The image shows the fan blade 112. In this embodiment, the fan blade has a curved surface design, as shown... Figure 4 The image shows the state of fan blade 112 when it is rotating. Fan blade 112 is at a certain angle to shaft 12, as shown below. Figure 5 The image shows the state where the fan blades 112 are assembled to form a windproof barrier when they stop rotating. It is worth noting that this application does not specifically limit the shape, structure, and material of the fan blades. Those skilled in the art should select appropriate fan blades based on actual application needs, with the design principle being to achieve the function of fan blades rotating to dissipate heat and preventing airflow backflow when stopped. Further details will not be elaborated here.

[0042] In this embodiment, the anti-backflow fan controls the fan blades through a limiting groove on the fan shaft. In normal operation, the fan blades rotate to generate centrifugal force and wind pressure. The blade stalks of the fan blades located in the limiting groove slide along the limiting groove toward the front end face of the anti-backflow fan, so that the fan blades are close to the heat dissipation target, such as the central processing unit, so that the fan can meet the heat dissipation requirements efficiently. In the stopped operation state, the fan blades stop rotating, and the airflow backflow causes the blade stalks of the fan blades located in the limiting groove to slide along the limiting groove toward the rear end face of the anti-backflow fan, so that the fan blades are away from the heat dissipation target, and the fan blades merge to form a windproof barrier, so that the fan avoids the waste of backflow airflow, thereby improving the heat dissipation efficiency of the fan.

[0043] It is worth noting that this application does not specifically limit the shape, length, or position of the limiting groove. The limiting groove can be a groove perpendicular to the front end face or a groove at a certain angle to the front end face. The limiting groove can connect to the front end face and the rear end face, or it can be just an opening that limits the blade shank of the fan blade. Those skilled in the art should select an appropriate limiting groove structure according to the actual application requirements, with the limiting of the blade shank of the fan blade as the design criterion, which will not be elaborated here.

[0044] In another specific example, the limiting groove includes a first limiting part disposed near the front end face, and the blade handle forms a first handle portion corresponding to the first limiting part near the front end face; when the fan body is in normal operation, the first handle portion of the blade handle of the plurality of fan blades abuts against the first limiting part and forms a first preset angle in a horizontal direction perpendicular to the fan shaft; the first preset angle is, for example, 45 degrees.

[0045] In this embodiment, a first limiting part is provided near the front end face of the limiting groove, and the blade handle and the first limiting part form a corresponding shape. For example, the first limiting part is a chamfer with a first preset angle, and the side of the first limiting part near the blade handle is concave relative to the front end face, while the side of the blade handle near the first limiting part is convex relative to the front end face. In normal operation, the blade handle abuts against the first limiting part in the limiting groove, and the operation stability of the anti-backflow fan is effectively improved by the concave surface of the first limiting part and the convex surface of the blade handle. The chamfer of the first limiting part makes the fan blades form a certain angle, and the air force generated by the fan blades is larger at this time, with better heat dissipation characteristics.

[0046] It is worth noting that this application does not specifically limit the setting of the first limiting part and the corresponding petiole stalk, with the design principle of achieving stable splicing of the two, which will not be elaborated here.

[0047] In another specific embodiment, the limiting groove includes a second limiting part placed near the rear end face, and the blade handle forms a second handle part corresponding to the second limiting part near the rear end face; when the fan body is in a stopped state, the second handle part of the blade handle of the plurality of fan blades abuts against the second limiting part and forms a second preset angle in a horizontal direction perpendicular to the fan shaft so that the plurality of fan blades are spliced ​​together to form a windproof barrier.

[0048] In this embodiment, a second limiting part is provided near the rear end face of the limiting groove, and the blade shank and the second limiting part form a corresponding shape. For example, the side of the second limiting part near the blade shank is concave relative to the front end face, while the side of the blade shank near the second limiting part is convex relative to the front end face. In the stopped operation state, the blade shank abuts against the second limiting part in the limiting groove, and the concave surface of the corresponding second limiting part and the convex surface of the blade shank effectively fix the splicing state of each blade of the anti-backflow fan. For example, each blade is in a horizontal state and forms a complete spliced ​​windproof barrier, thereby preventing backflow and effectively improving the heat dissipation performance of the fan.

[0049] To further improve the heat dissipation performance against backflow, in one specific embodiment, such as Figure 1As shown, the limiting device also includes limiting springs 124 corresponding to each fan blade. One end of the limiting spring 124 is disposed on the rear end face 121 of the fan shaft 12, and the other end of the limiting spring 124 is disposed on the end of the fan blade 112 near the fan shaft 12. When the fan body is in normal operation, the multiple fan blades resist the tension of the limiting springs under the action of centrifugal force and wind pressure and move towards the front end face along the limiting groove. When the fan body is stopped, the multiple fan blades move towards the rear end face along the limiting groove under the action of the return airflow and the tension of the limiting springs and splice together to form a windproof barrier.

[0050] In this embodiment, the anti-backflow fan controls the fan blades through a limiting groove and a limiting spring on the fan shaft. The limiting spring, in the stopped state, uses its elastic force to further pull the fan blades towards the rear end of the fan. Specifically, in normal operation, each fan blade rotates and, under the influence of centrifugal force and wind pressure, resists the small elastic pull of the limiting spring and slides along the limiting groove towards the front end. In the stopped state, each fan blade remains stationary and, under the influence of the returning airflow and the larger elastic pull of the limiting spring, slides along the limiting groove towards the rear end, forming a windproof barrier. This embodiment further improves the fan's heat dissipation performance by adding a limiting spring in addition to the limiting groove.

[0051] In another specific embodiment, the limiting device is a limiting spring corresponding to each fan blade. One end of the limiting spring is disposed on the rear end face of the fan shaft, and the other end of the limiting spring is disposed on the end of the fan blade near the fan shaft. When the fan body is running normally, the multiple fan blades resist the tension of the limiting spring and approach the front end face under the action of centrifugal force and wind pressure. When the fan body stops running, the multiple fan blades approach the rear end face under the action of the return airflow and the tension of the limiting spring and splice together to form a windproof barrier.

[0052] In this embodiment, the anti-backflow fan controls the fan blades through a limiting spring located on the rear end face of the fan shaft. During normal operation, each fan blade rotates and, under the influence of centrifugal force and wind pressure, resists the small elastic tension of the limiting spring and moves towards the front end face. When the fan is stopped, each fan blade remains stationary and, under the influence of the returning airflow and the larger elastic tension of the limiting spring, moves towards the rear end face and joins together to form a windproof barrier. This embodiment effectively improves the fan's heat dissipation performance through the limiting spring.

[0053] Corresponding to the anti-backflow fan provided in the above embodiments, one embodiment of this application also provides an anti-backflow method utilizing the above-described anti-backflow fan, such as... Figure 6As shown, the fan body operates normally, and multiple fan blades rotate with the rotation of the fan shaft, approaching the front end face of the fan shaft under the limiting action of the limiting device; when the fan body stops operating, the multiple fan blades stop rotating with the stationary position of the fan shaft, approaching the rear end face of the fan shaft under the limiting action of the limiting device and splicing together to form a windproof barrier.

[0054] In this embodiment, the anti-backflow method controls the fan blades by setting a limiting device on the anti-backflow fan. In normal operation, the fan blades are brought close to the front face of the fan to achieve efficient heat dissipation, and in the stopped operation state, the fan blades are brought close to the rear face of the fan to achieve anti-backflow. This overcomes the problems existing in the prior art and effectively improves the fan's heat dissipation efficiency.

[0055] Since the anti-backflow method provided in this embodiment corresponds to the anti-backflow fan provided in the above embodiments, the previous implementation methods are also applicable to the anti-backflow method provided in this embodiment, and will not be described in detail in this embodiment.

[0056] Based on the aforementioned anti-backflow fan, another embodiment of this application also provides a heat dissipation device including the aforementioned anti-backflow fan.

[0057] In this embodiment, the heat dissipation device is a heat dissipation device installed in a server or large computer equipment, which can efficiently dissipate heat during normal operation and prevent backflow when the machine is stopped, thereby improving heat dissipation efficiency.

[0058] Based on the aforementioned anti-backflow fan, another embodiment of this application also provides a server including the aforementioned anti-backflow fan.

[0059] In this embodiment, the server improves heat dissipation efficiency by using an anti-backflow fan installed therein to efficiently dissipate heat during normal operation and prevent backflow when the server is not in operation.

[0060] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. For those skilled in the art, other variations or modifications can be made based on the above description. It is impossible to exhaustively list all the implementation methods here. All obvious variations or modifications derived from the technical solutions of the present invention are still within the protection scope of the present invention.

Claims

1. A backflow prevention fan for servers, characterized in that, The fan includes a fan frame and a fan body disposed within the fan frame. The fan body includes a fan shaft, a limiting device, and a plurality of fan blades disposed on the fan shaft. In normal operation, the fan body's multiple fan blades rotate with the fan shaft and approach the front end face of the fan shaft under the limiting action of the limiting device. When the fan body is stopped, the multiple fan blades stop rotating as the fan shaft stops moving. Under the limiting action of the limiting device, they approach the rear end face of the fan shaft and splice together to form a windproof barrier. The limiting device includes a limiting groove provided on the fan shaft. The fan blades include a blade and a blade holder, and the blade holder is provided in the limiting groove. When the fan body is in normal operation, the multiple fan blades move closer to the front end face along the limiting groove under the action of centrifugal force and wind pressure. When the fan body is not running, the multiple fan blades move along the limiting groove towards the rear end face under the action of the returning airflow and are spliced ​​together to form a windproof barrier.

2. The anti-backflow fan according to claim 1, characterized in that, The limiting groove includes a first limiting portion disposed near the front end face, and the leaf stalk forms a first stalk portion corresponding to the first limiting portion near the front end face; When the fan body is in normal operation, the first shank of the blade shank of the plurality of fan blades abuts against the first limiting part and forms a first preset angle in the horizontal direction perpendicular to the fan shaft.

3. The anti-backflow fan according to claim 2, characterized in that, One of the first limiting portion and the first handle portion is a recess facing the front end face, and the other of the first limiting portion and the first handle portion is a convex portion facing the front end face.

4. The anti-backflow fan according to claim 1, characterized in that, The limiting groove includes a second limiting portion disposed near the rear end face, and the leaf stalk forms a second stalk portion corresponding to the second limiting portion near the rear end face; When the fan body is not running, the second shank of the blades of the plurality of fan blades abuts against the second limiting part and forms a second preset angle in the horizontal direction perpendicular to the fan shaft, so that the plurality of fan blades are spliced ​​together to form a windproof barrier.

5. The anti-backflow fan according to claim 1, characterized in that, The limiting device also includes a limiting spring corresponding to each fan blade. One end of the limiting spring is disposed on the rear end face of the fan shaft, and the other end of the limiting spring is disposed on the end of the fan blade near the fan shaft. In normal operation, the fan body's multiple fan blades, under the action of centrifugal force and wind pressure, resist the tension of the limiting spring and move along the limiting groove towards the front end face. When the fan body is not running, the multiple fan blades, under the action of the returning airflow and the tension of the limiting spring, move along the limiting groove towards the rear end face and splice together to form a windproof barrier.

6. The anti-backflow fan according to claim 1, characterized in that, The limiting device includes a limiting spring corresponding to each fan blade. One end of the limiting spring is disposed on the rear end face of the fan shaft, and the other end of the limiting spring is disposed on the end of the fan blade near the fan shaft. When the fan body is running normally, the multiple fan blades resist the tension of the limiting spring and approach the front end face under the action of centrifugal force and wind pressure. When the fan body stops operating, the multiple fan blades approach the rear end face under the action of the returning airflow and the tension of the limiting spring, and splice together to form a windproof barrier.

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