Anti-backflow air duct device and computer apparatus

Abstract

The present disclosure relates to the technical field of computers. Disclosed are an anti-backflow air duct device and a computer apparatus, so as to solve the problem of the heat dissipation effect of an apparatus power supply deteriorating due to the backflow effect of heat dissipation air inside a computer. An air duct member of the anti-backflow air duct device has an air duct cavity, and a first air vent and a second air vent that are respectively in communication with two ends of the air duct cavity. A flow guide assembly comprises grid plates and guide members, wherein the grid plates are located at the end of the air duct cavity close to the first air vent, and the grid plates are connected to the air duct member by means of the guide members. The flow guide assembly has a flow guide state and an anti-backflow state, wherein when the flow guide assembly is in the flow guide state, the grid plates are located in the air duct cavity; and when the flow guide assembly is in the anti-backflow state, the grid plates at least partially move out of the air duct cavity via the first air vent, so as to increase the flow guide length of the air duct cavity.

Description

Anti-backflow air duct device and computer equipment

[0001] Cross-reference to Related Applications

[0002] The present disclosure claims the priority of and the benefit of Chinese Patent Application No. 202411356564.9, filed on September 27, 2024, entitled “Anti-backflow air duct device and computer equipment”, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0003] The present disclosure relates to the technical field of computers, in particular to an anti-backflow air duct device and a computer equipment. BACKGROUND

[0004] Air-cooled servers mainly rely on fans inside the server for heat dissipation. As shown in FIGS. 1 and 2, along the Y direction, the system fan located at the rear of the case draws air from the front window of the case, and the air flows through the mainboard module and the front window peripherals, and is blown out from the rear window. In addition to the system fan, the server also has a built-in fan (i.e., a power supply fan) in the power supply, which mainly functions to dissipate heat for the internal circuit of the power supply. The power supply fan is independently arranged relative to the system fan.

[0005] Referring to FIG. 1, the system fan and the power supply are arranged close to the rear window of the server case along the Y direction and are distributed in sequence along the X direction. In the heat dissipation control strategy, the speed control factor of the power supply fan involves the power supply inlet temperature and the internal circuit temperature of the power supply. If the power supply inlet temperature and the internal circuit temperature of the power supply are high, the speed of the power supply fan is increased, thereby achieving temperature control of the power supply.

[0006] However, when the system fan and the power supply fan are placed side by side along the X direction, there is usually a backflow problem. When the system temperature rises, the system fan rapidly increases the speed to quickly ventilate and dissipate heat for the mainboard module. With the increase of the system fan speed, the air volume drawn by the system fan also increases, and the pressure difference between the air pressure on the inlet side of the system fan and the air pressure on the inlet side of the power supply is high. Based on this, as shown in FIG. 2, in addition to the original air flow path at the front of the case, a part of the air volume is also drawn from the air duct of the power supply fan, that is, at least part of the air in the original power supply air flow path is extracted and flows to the system fan. At this time, the backflow effect occurs, which sharply reduces the amount of air flowing through the internal circuit of the power supply drawn by the power supply fan, that is, the heat dissipation effect of the power supply sharply decreases, which can cause the power supply to overheat, alarm, and even risk burning out. SUMMARY

[0007] In a first aspect, the present disclosure provides an anti-backflow air duct device, comprising an air duct member and a guide assembly. The air duct member has an air duct cavity and a first air vent and a second air vent sequentially communicating with two ends of the air duct cavity. The guide assembly comprises a grid plate and a guide member, the grid plate is located at one end of the air duct cavity close to the first air vent, and the grid plate is arranged in connection with the air duct member through the guide member. The guide assembly has a guide state and an anti-backflow state. When the guide assembly is in the guide state, the grid plate is located in the air duct cavity. When the guide assembly is in the anti-backflow state, the grid plate is at least partially moved outside the air duct cavity through the first air vent to increase the guide length of the air duct cavity.

[0008] In an optional embodiment, the anti-backflow air duct device further comprises a driving mechanism, the driving mechanism is arranged in connection with the air duct member and / or the guide member, and one end of the driving mechanism is connected with the grid plate. Taking the plane where the first air vent is located as a reference plane, in the reference plane, the wind pressure at the first air vent is defined as a first wind pressure, and the wind pressure outside the first air vent is defined as a second wind pressure. The driving mechanism is configured to:

[0009] When the first wind pressure is higher than the second wind pressure by a preset air pressure value, the driving mechanism drives the grid plate to move from the guide state to the anti-backflow state. Otherwise, the driving mechanism drives the grid plate to be in the guide state.

[0010] In an optional embodiment, the guide member comprises a rotating shaft, the grid plate is rotatably connected with the air duct member through the rotating shaft, so as to rotate and adjust the grid plate between the guide state and the anti-backflow state.

[0011] In an optional embodiment, the guide member comprises at least one of a first limiting member and a second limiting member. The first limiting member is arranged in connection with the air duct member, when the grid plate rotates from the guide state to the anti-backflow state, the first limiting member contacts the grid plate to prevent the grid plate from continuing to rotate. The second limiting member is arranged in connection with the air duct member, when the grid plate rotates from the anti-backflow state to the guide state, the second limiting member contacts the grid plate to prevent the grid plate from continuing to rotate.

[0012] In an optional embodiment, the driving mechanism comprises an elastic member. One end of the elastic member is arranged in connection with the guide member and / or the air duct member, and the other end of the elastic member is connected with the grid plate. When the grid plate is in the anti-backflow state, the elastic member is in a tensile state or a compression state, and accumulates elastic potential energy. When the grid plate is in the guide state, the elastic potential energy of the elastic member decreases.

[0013] In an optional embodiment, when the grid plate is in the anti-backflow state, the pressure difference between the first wind pressure and the second wind pressure acting on the wind pressure at the grid plate is greater than or equal to the elastic force of the elastic member.

[0014] In an alternative embodiment, when the guide comprises a rotating shaft, the driving mechanism further comprises a torsion spring, the torsion spring is inserted along the axial direction of the rotating shaft, one end of the torsion spring is in contact with the grille plate, and the other end of the torsion spring is in contact with the air duct piece. When the grille plate is in the anti-backflow state, the torsion spring accumulates elastic potential energy. When the grille plate is in the flow guiding state, the elastic potential energy of the torsion spring decreases.

[0015] In some embodiments, the elastic force F1 of the torsion spring acting on the grille plate is k x θ x L / 2. The pressure difference F2 of the first wind pressure and the second wind pressure acting on the grille plate is ΔP x S. When the pressure difference force is greater than the elastic force, that is, F2≥F1, the grille plate rotates from the flow guiding state to the anti-backflow state. Wherein, k is the stiffness coefficient of the torsion spring, θ is the rotation angle of the grille plate compared with the flow guiding state, S is the area of the grille plate, and ΔP is the difference between the first wind pressure and the second wind pressure.

[0016] In an alternative embodiment, the air duct cavity is arranged to extend along a first straight line direction at least at the first air vent. The number of grille plates is multiple, and one grille plate is arranged to be connected with the air duct piece through at least one guide. When the flow guiding assembly is in the flow guiding state and / or the anti-backflow state, the multiple grille plates are spaced apart along a second straight line direction. The first straight line direction is arranged perpendicularly to the second straight line direction.

[0017] In an alternative embodiment, when the flow guiding assembly is in the flow guiding state and / or the anti-backflow state. The length dimension of the grille plate along the first straight line direction is less than the interval dimension of the adjacent two grille plates along the second straight line direction.

[0018] In an alternative embodiment, the driving mechanism further comprises a power piece and an adjusting module, one end of the power piece is connected with the air duct piece, and the other end of the power piece is arranged to be connected with the grille plate. The adjusting module is arranged to be connected with the power piece, and the adjusting module is configured to:

[0019] When the first wind pressure is higher than the second wind pressure by a preset air pressure value, the adjusting module controls the power piece to drive the grille plate to move from the flow guiding state to the anti-backflow state. Otherwise, the adjusting module controls the power piece to keep the grille plate in the flow guiding state.

[0020] In an alternative embodiment, the power piece comprises a driving motor, and the adjusting module is in control connection with the driving motor. The output end of the driving motor is used to drive the grille plate to move and switch between the flow guiding state and the anti-backflow state.

[0021] In an alternative embodiment, the power member further comprises a driving link and a driving cylinder, one end of the driving link is connected with the air duct member, and the other end of the driving link is connected with the grille plate. The driving cylinder is connected between the driving links, or the driving cylinder is connected between the driving link and the air duct member. The adjusting module is in control connection with the driving cylinder, for controlling the grille plate to move and switch between the flow guiding state and the backflow prevention state.

[0022] In a second aspect, the disclosure provides a computer device, comprising a case, a power module, a case fan and the backflow prevention air duct device in the first aspect. The case is provided with a receiving cavity, and one end of the receiving cavity along a first straight line direction is provided with an air outlet. The power module is installed in the receiving cavity and is arranged close to the air outlet along the first straight line direction. Along the first straight line direction, one end of the power module away from the air outlet is an air inlet end, the air inlet end is in communication with the second air vent, and the power module is provided with a module fan to drive air to flow into the power module along the first straight line direction through the air duct member. In the receiving cavity, the case fan is arranged close to the air inlet end of the power module along the first straight line direction to drive air to flow through the case fan along the first straight line direction. And the case fan is arranged on one side of the power module along a second straight line direction, and the second straight line direction is perpendicular to the first straight line direction. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the specific embodiments or related art of the disclosure, the drawings needed to be used in the specific embodiments or related art description will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the disclosure, and other drawings can also be obtained by those skilled in the art without creative labor.

[0024] Fig. 1 is a first air duct structure schematic diagram of the power supply and system fan inside the server in the related art;

[0025] Fig. 2 is a second air duct structure schematic diagram of the power supply and system fan inside the server in the related art;

[0026] Fig. 3 is a structure schematic diagram of the first backflow prevention air duct device in a flow guiding state according to an embodiment of the disclosure;

[0027] Fig. 4 is a structure schematic diagram of the first backflow prevention air duct device in a backflow prevention state according to an embodiment of the disclosure;

[0028] Fig. 5 is a structure schematic diagram of the second backflow prevention air duct device in a flow guiding state according to an embodiment of the disclosure;

[0029] Fig. 6 is a structure schematic diagram of the second backflow prevention air duct device in a backflow prevention state according to an embodiment of the disclosure;

[0030] Fig. 7 is a partial structural schematic diagram of a third backflow prevention air duct device according to an embodiment of the present disclosure;

[0031] Fig. 8 is a connection structural schematic diagram of a driving mechanism according to an embodiment of the present disclosure;

[0032] Fig. 9 is a structural schematic diagram of a backflow prevention air duct device including a driving motor according to an embodiment of the present disclosure;

[0033] Fig. 10 is a structural schematic diagram of a backflow prevention air duct device including a driving cylinder according to an embodiment of the present disclosure;

[0034] Fig. 11 is a structural schematic diagram of a computer device in a flow guiding state according to an embodiment of the present disclosure;

[0035] Fig. 12 is a structural schematic diagram of a computer device in a backflow prevention state according to an embodiment of the present disclosure;

[0036] Fig. 13 is a connection structural schematic diagram of a computer device including a master control module according to an embodiment of the present disclosure;

[0037] Fig. 14 is a curve relationship diagram of fan rotating speed and air pressure. DETAILED DESCRIPTION

[0038] To make the objectives, technical solutions, and advantages of the embodiments of the present disclosure clearer, the technical solutions in the embodiments of the present disclosure will be described clearly and completely below with reference to the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are some but not all of the embodiments of the present disclosure. Based on the embodiments in the present disclosure, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present disclosure.

[0039] The air-cooled server mainly relies on the fan inside the server for heat dissipation. As shown in Figs. 1 and 2, Fig. 1 is a first air duct structure schematic diagram of a power supply and a system fan inside a server in the related art, and Fig. 2 is a second air duct structure schematic diagram of a power supply and a system fan inside a server in the related art. Along the Y direction, the system fan located at the rear part of the case draws air from the front window of the case, and the air flows through the mainboard module and the front window peripherals and is blown out from the rear window. In addition to the system fan, the power supply of the server also has a built-in fan (i.e., a power supply fan), which mainly functions to dissipate heat for the internal circuit of the power supply. The power supply fan and the system fan are relatively independently arranged.

[0040] Referring to FIG. 1, the system fan and the power supply are arranged close to the rear window of the server case along the Y direction and are distributed in sequence along the X direction. In the heat dissipation regulation strategy, the rotation speed of the power supply fan is regulated according to the temperature of the power supply air inlet and the temperature of the internal circuit of the power supply. If the temperature of the power supply air inlet and the temperature of the internal circuit of the power supply are high, the rotation speed of the power supply fan is increased to regulate the temperature of the power supply.

[0041] However, when the system fan and the power supply fan are arranged side by side along the X direction, backflow usually occurs. When the system temperature rises, the system fan rapidly increases the rotation speed to rapidly ventilate and dissipate heat of the mainboard module. With the increase of the rotation speed of the system fan, the air volume drawn by the system fan also increases, and the pressure difference between the air pressure of the system air inlet side and the air pressure of the power supply air inlet side is high. Based on this, as shown in FIG. 2, in addition to the original air flow path in the front part of the case, a part of the air volume is also drawn from the air duct of the power supply fan, that is, at least part of the air in the original power supply air flow path is drawn and flows to the system fan. At this time, backflow occurs, which sharply reduces the air volume flowing through the internal circuit of the power supply drawn by the power supply fan, that is, the heat dissipation effect of the power supply sharply decreases, which may cause the power supply to overheat, alarm, and even burn out.

[0042] The backflow prevention air duct device and the computer equipment provided by the present application are described below in combination with FIGS. 3 to 14 to solve the problem of poor heat dissipation effect of the equipment power supply caused by backflow of the computer internal heat dissipation air.

[0043] In one aspect, the present disclosure provides a backflow prevention air duct device, as shown in FIGS. 3 and 4. The backflow prevention air duct device 10 includes an air duct piece 11 and a flow guide assembly 12. The air duct piece 11 has an air duct cavity 111 and a first air vent 112 and a second air vent 113 sequentially communicated with both ends of the air duct cavity 111. The flow guide assembly 12 includes a grid plate 121 and a guide piece 122. The grid plate 121 is located at one end of the air duct cavity 111 close to the first air vent 112, and the grid plate 121 is arranged in connection with the air duct piece 11 through the guide piece 122.

[0044] The flow guide assembly 12 has a flow guide state shown in FIG. 3 and a backflow prevention state shown in FIG. 4. When the flow guide assembly 12 is in the flow guide state shown in FIG. 3, the grid plate 121 is located in the air duct cavity 111. When the flow guide assembly 12 is in the backflow prevention state, the grid plate 121 is at least partially moved to the outside of the air duct cavity 111 through the first air vent 112 to increase the flow guide length of the air duct cavity 111.

[0045] The backflow prevention air duct device 10 provided by the embodiments of the present disclosure has an air duct piece 11 surrounding an air duct cavity 111 for guiding air flow, and a first air vent 112 and a second air vent 113 at two ends of the air duct cavity 111 to enable air to flow in the air duct cavity 111. The air duct cavity 111 has a flow guide assembly 12 including a grid plate 121 and a guide piece 122 at one end close to the first air vent 112, and the grid plate 121 is connected to the air duct piece 11 through the guide piece 122 to enable the flow guide assembly 12 to switch between a flow guiding state and a backflow prevention state. When the flow guide assembly 12 is in the flow guiding state shown in FIG. 3, the grid plate 121 is located in the air duct cavity 111 to enable air to flow smoothly through the air duct cavity 111. When the flow guide assembly 12 is in the backflow prevention state shown in FIG. 4, the grid plate 121 is at least partially moved out of the air duct cavity 111 through the first air vent 112 to increase the flow guiding length of the air duct cavity 111, thereby avoiding the backflow effect caused by a large wind pressure difference near the periphery of the first air vent 112.

[0046] For example, a large wind pressure at the first air vent 112 causes some air of the first air vent 112 to flow to a position with a lower wind pressure on the periphery, thereby reducing the air flow into the air duct cavity 111 through the first air vent 112. In the process of heat dissipation by air, the above-mentioned situation can cause the air flow out of the air duct cavity 111 through the second air vent 113 to be reduced, thereby greatly weakening the heat dissipation effect of the original components, causing the corresponding components to overheat, alarm, or even burn out. However, by providing the flow guide assembly 12 including the grid plate 121 and the guide piece 122 in the air duct piece 11, the backflow prevention air duct device 10 can be applied to a computer device such as a server to improve the backflow effect.

[0047] For example, the backflow prevention air duct device 10 is installed at the power supply air inlet at the rear window of the server. When the rotating speed of the system fan is rapidly increased to cause the wind pressure on the air inlet side of the system fan to be much lower than the wind pressure at the power supply air inlet, the flow guide assembly 12 is moved from the flow guiding state to the backflow prevention state to enable the grid plate 121 moved out of the air duct cavity 111 to increase the flow guiding length of the air duct cavity 111. This is equivalent to extending the position of the power supply air inlet upstream from the first air vent 112, and since the wind pressure difference between the extended power supply air inlet and the wind pressure upstream of the system fan at this position is greatly reduced or there is no pressure difference, the air at the power supply air inlet is not sucked by the high-speed rotating system fan or the amount of air sucked is reduced, thereby enabling the power supply fan to maintain sufficient air extraction for heat dissipation. That is, by weakening or avoiding the backflow effect, the power supply of the device can maintain good heat dissipation effect.

[0048] In some embodiments, as shown in FIG. 3 and FIG. 4, the backflow prevention air duct device 10 further comprises a driving mechanism 13, which is arranged in connection with the air duct piece 11 and / or the guide piece 122, and one end of the driving mechanism 13 is connected with the grid plate 121. Taking the plane where the first air vent 112 is located as a reference plane, in the reference plane (i.e. the plane perpendicular to the Y direction at the first air vent 112), the air pressure at the first air vent 112 is defined as the first air pressure, and the air pressure outside the first air vent 112 is defined as the second air pressure. The driving mechanism 13 is configured to:

[0049] When the first air pressure is higher than the second air pressure by a preset air pressure value, as shown in FIG. 3, it can be considered that the first air pressure at K1 is higher than the second air pressure at K2 by the preset air pressure value, which will cause part of the air originally flowing into the air duct cavity 111 through the first air vent 112 to flow towards K2, so as to reduce the amount of air entering the air duct cavity 111. By arranging the driving mechanism 13 to drive the grid plate 121 to move from the flow guiding state shown in FIG. 3 to the backflow prevention state shown in FIG. 4, the amount of air leaking along the X direction towards K2 can be reduced. Otherwise, the driving mechanism 13 drives the grid plate 121 to be in the flow guiding state, at this time, the grid plate 121 in the flow guiding state (i.e. located inside the air duct cavity 111) will not hinder the air at K2 from flowing into the air duct cavity 111 through the first air vent 112, as shown in FIG. 11, which is conducive to increasing the air flow through the air duct cavity 111.

[0050] In this way, by configuring the driving mechanism 13, the grid plate 121 can automatically switch and move between the flow guiding state and the backflow prevention state. For example, when the air pressure at the first air vent 112 is small, so that the first air pressure is higher than the second air pressure by the preset air pressure value, the driving mechanism 13 can drive the grid plate 121 to move from the flow guiding state to the backflow prevention state, so as to avoid or reduce the air near the first air vent 112 being sucked by other fan structures on the side. In other cases, the driving mechanism 13 drives the grid plate 121 to remain in the flow guiding state at the initial position. In this way, by automatically switching the driving mechanism 13 and the flow guiding assembly 12, the backflow prevention air duct device 10 can automatically switch and adjust the flow guiding state and the backflow prevention state according to the preset conditions, so as to respond to the change in pressure difference in real time.

[0051] Alternatively, the user can manually operate the grid plate 121 to switch and move between the flow guiding state and the backflow prevention state.

[0052] In some embodiments, as shown in FIG. 3 and FIG. 4, the air duct cavity 111 is arranged to extend along a first straight line direction at least at the first air vent 112, and the first straight line direction is the Y direction in the drawings. Alternatively, the air duct cavity 111 can be a straight line air duct structure arranged along the Y direction.

[0053] When the flow guide assembly 12 is in the flow guiding state shown in FIG. 3 or the backflow prevention state shown in FIG. 4, one of the grid plates 121 is arranged along a second straight direction close to one side of the air duct piece 11. The second straight direction is the X direction in the figure. That is, the grid plate 121 in the flow guiding state or the backflow prevention state is arranged parallel to the first straight direction and perpendicular to the second straight direction. The first straight direction and the second straight direction are arranged perpendicular to each other.

[0054] For example, air flows along the Y direction through the first air vent 112, the air duct cavity 111, and the second air vent 113 in sequence. At this time, the first air vent 112 is the air inlet of the air duct cavity 111, and the second air vent 113 is the air outlet of the air duct cavity 111.

[0055] When the grid plate 121 is in the flow guiding state or the backflow prevention state, by arranging one of the grid plates 121 along the second straight direction close to the air duct cavity 111, the side of the air duct piece 11 can extend upstream of the air flow when the grid plate 121 is in the backflow prevention state, thereby avoiding the backflow phenomenon of the air duct piece 11 in the side direction due to the external large negative pressure, or reducing the air outflow at the first air vent 112 when the backflow phenomenon occurs. That is, by adjusting the installation position of the grid plate 121, at least one of the air duct pieces 11 is extended to avoid the occurrence of the air outflow at the first air vent 112 due to the local large negative pressure near the outside, and the structure is simple and effective.

[0056] It should be noted that in the embodiments of the present disclosure, during the automatic switching process between the flow guiding state and the backflow prevention state of the grid plate 121, the grid plate 121 has different moving modes due to different installation modes of the grid plate 121.

[0057] In some embodiments, as shown in FIGS. 3 and 4, the guide 122 includes a rotating shaft 1221, and the grid plate 121 is rotationally connected to the air duct piece 11 through the rotating shaft 1221, so that the grid plate 121 is rotationally adjusted between the flow guiding state and the backflow prevention state. It can also be regarded as that the grid plate 121 is flipped between the flow guiding state and the backflow prevention state. The axis of the rotating shaft 1221 can be perpendicular to the X direction and the Y direction, which is not limited.

[0058] By arranging the rotating shaft 1221, the grid plate 121 can be rotationally adjusted between the flow guiding state and the backflow prevention state by 180°, which is relatively convenient.

[0059] Alternatively, as shown in FIG. 5 and FIG. 6, the guide 122 further comprises a guide portion 1222 arranged along a first linear direction (i.e. Y direction). Along a third linear direction (not shown in the figures), two guide portions 1222 are arranged on opposite sides of the inner wall of the air duct member 11, and the third linear direction is arranged perpendicular to the first linear direction and the second linear direction. Along the third linear direction, the grid plate 121 is installed between the two guide portions 1222, and the guide portion 1222 can be a guide rail structure or a guide groove structure extending along the Y direction, so that the grid plate 121 slides between the air guiding state shown in FIG. 5 and the backflow prevention state shown in FIG. 6 along the Y direction.

[0060] That is, through the arrangement of the guide portion 1222, the grid plate 121 can be partially or entirely located in the air duct cavity 111 along the Y direction to maintain the air guiding state. Alternatively, the grid plate 121 can also slide out of the air duct cavity 111 along the Y direction away from the second air vent 113, so as to increase the extension length of the air duct cavity 111 upstream by the grid plate 121 extending upstream.

[0061] Among them, at the first air vent 112 of the air duct member 11, the air guiding assembly 12 can be provided with one grid plate 121. Taking the second linear direction (i.e. X direction) as an example, one grid plate 121 can be installed on the left side inside the air duct member 11 to prevent the low pressure source outside the left side from drawing air at the first air vent 112. Alternatively, one grid plate 121 can also be installed on the right side inside the air duct member 11 to prevent the low pressure source outside the right side from drawing air at the first air vent 112.

[0062] In some embodiments, the number of grid plates 121 is multiple, and one grid plate 121 is arranged by being connected to the air duct member 11 through at least one guide 122. When the air guiding assembly 12 is in the air guiding state and / or the backflow prevention state, as shown in FIG. 3 and FIG. 5, the multiple grid plates 121 are spaced apart along the second linear direction.

[0063] In this way, by arranging multiple grid plates 121 spaced apart along the X direction, when the multiple grid plates 121 are all in the air guiding state, the grid plates 121 located partially or entirely in the air duct cavity 111 will not hinder the smooth flow of air into the air duct cavity 111 along the Y direction through the first air vent 112. When the multiple grid plates 121 are switched to the backflow prevention state, the arrangement of the multiple grid plates 121 extending upstream facilitates multi-level control and hindering in the X direction, so as to reduce the amount of air leakage at the first air vent 112 to both ends, which is conducive to maintaining a larger air outlet at the second air vent 113.

[0064] It should be noted that in the case that the guide part 1222 of the grid plate 121 is connected to the inner side of the air duct 11 to enable the grid plate 121 to slide along the Y direction, the negative pressure source outside the air duct 11 can be located on the left side or the right side of the first air vent 112 along the X direction, or can exist on both the left side and the right side.

[0065] In addition, in the case that the grid plate 121 is rotationally connected to the air duct 11 through the rotating shaft 1221, as shown in FIG. 4, taking the case that the plurality of grid plates 121 are rotated (or flipped) from the flow guiding state to the backflow prevention state in the counterclockwise direction as an example. At this time, the negative pressure source outside the air duct 11 is arranged on the left side of the air duct 11 along the X direction.

[0066] Alternatively, taking the case that the plurality of grid plates 121 are rotated from the flow guiding state to the backflow prevention state in the clockwise direction as an example. The negative pressure source outside the air duct 11 is arranged on the right side of the air duct 11 along the X direction.

[0067] In some embodiments, when the flow guiding assembly 12 is in the flow guiding state and / or the backflow prevention state, the length dimension of the grid plate 121 along the first straight direction (i.e., the Y direction) is smaller than the interval dimension of the adjacent two grid plates 121 along the second straight direction (i.e., the X direction).

[0068] As shown in FIGS. 3 and 5, when the grid plate 121 is in the flow guiding state, the length dimension of the grid plate 121 is defined as the profile dimension of the grid plate 121 in the Y direction. Correspondingly, when the grid plate 121 is in the backflow prevention state shown in FIGS. 4 and 6, the length dimension of the grid plate 121 is also the profile dimension in the Y direction.

[0069] The above scheme can enable the plurality of grid plates 121 to be reasonably and spacedly distributed along the X direction. Taking the plurality of grid plates 121 rotationally connected to the air duct 11 through the rotating shaft 1221 shown in FIGS. 3 and 4 as an example, by arranging the interval of the adjacent two grid plates 121 along the X direction to be greater than the length dimension of the grid plate 121, the grid plate 121 can be smoothly switched between the flow guiding state and the backflow prevention state.

[0070] In some embodiments, as shown in FIGS. 3 and 4, the guide 122 includes at least one of a first limiting part 1223 and a second limiting part 1224. The first limiting part 1223 is arranged in connection with the air duct 11, and when the grid plate 121 is rotated from the flow guiding state to the backflow prevention state, the first limiting part 1223 contacts the grid plate 121 to prevent the grid plate 121 from continuing to rotate. The second limiting part 1224 is arranged in connection with the air duct 11, and when the grid plate 121 is rotated from the backflow prevention state to the flow guiding state, the second limiting part 1224 contacts the grid plate 121 to prevent the grid plate 121 from continuing to rotate.

[0071] Taking the grid plate 121 rotating from the flow guiding state to the backflow prevention state in the counterclockwise direction as an example, when the grid plate rotates counterclockwise, the windward side is defined as the outer side, and the leeward side is defined as the inner side. When the grid plate 121 rotates counterclockwise from the flow guiding state shown in FIG. 3 to the backflow prevention state shown in FIG. 4, the first limiting piece 1223 is in contact with the outer side of the grid plate 121 to prevent the grid plate 121 from continuing to rotate in the counterclockwise direction. When the grid plate 121 rotates clockwise from the backflow prevention state shown in FIG. 4 to the flow guiding state shown in FIG. 3, the second limiting piece 1224 is in contact with the inner side of the grid plate 121 to prevent the grid plate 121 from continuing to rotate in the clockwise direction.

[0072] Even if the grid plate 121 is arranged to slide between the flow guiding state and the backflow prevention state in the Y direction, the first limiting piece 1223 and the second limiting piece 2334 are arranged to prevent the grid plate 121 from continuing to slide in the Y direction away from the second air vent 113 in the backflow prevention state, and to prevent the grid plate 121 from continuing to slide in the Y direction towards the second air vent 113 in the flow guiding state.

[0073] That is, the first limiting piece 1223 and the second limiting piece 1224 are arranged to enable the grid plate 121 to be precisely switched between the flow guiding state and the backflow prevention state.

[0074] It should be noted that the first limiting piece 1223 and the second limiting piece 1224 can be installed and arranged as needed. The first limiting piece 1223 and the second limiting piece 1224 can be separate components and are both arranged in connection with the air duct piece 11. Referring to FIG. 4, the first limiting piece 1223 is arranged on the side of the rotating shaft 1221 away from the second air vent 113 in the Y direction, and the second limiting piece 1224 is arranged on the side of the rotating shaft 1221 close to the second air vent 113 in the Y direction.

[0075] Alternatively, the first limiting piece 1223 and the second limiting piece 1224 can also be arranged as an integral component, which is not limited.

[0076] In some embodiments, as shown in FIGS. 3 and 4, the driving mechanism 13 includes an elastic piece 131, one end of the elastic piece 131 is arranged in connection with the guide piece 122 and / or the air duct piece 11, and the other end of the elastic piece 131 is connected with the grid plate 121. When the grid plate 121 is in the backflow prevention state, the elastic piece 131 is in a stretched state or a compressed state, and accumulates elastic potential energy. When the grid plate 121 is in the flow guiding state, the elastic potential energy of the elastic piece 131 is reduced.

[0077] For example, the elastic member 131 can be a spring or an elastic rope, and is arranged around the rotating shaft 1221 in a counterclockwise direction and connected to the grid plate 121 and the air duct 11 at both ends. When the grid plate 121 is in the flow guiding state, the elastic member 131 is not stressed or is in a slightly stretched state, so that the grid plate 121 remains in the stable flow guiding state under the action of no external force or a small external force. When the grid plate 121 rotates counterclockwise under the action of the negative pressure airflow, the elastic member 131 is synchronously stretched. When the grid plate 121 rotates to the anti-backflow state, the elastic member 131 is in a stretched state and accumulates the maximum elastic potential energy. If the external force (such as the force of the negative pressure airflow) weakens or disappears, the elastic member 131 with the accumulated elastic potential energy can drive the grid plate 121 to rotate to the position of the flow guiding state until the elastic potential energy of the elastic member 131 decreases or is in the initial state.

[0078] Therefore, through the elastic member 131, the grid plate 121 can spontaneously rotate from the flow guiding position state to the anti-backflow position state under the action of the external negative pressure, thereby reducing the air leakage amount at the first air vent 112 caused by the external negative pressure and maintaining the stable anti-backflow state under the action of the external negative pressure. When the external negative pressure is small, the grid plate 121 can spontaneously switch from the anti-backflow state to the flow guiding state under the driving of the elastic member 131 with the accumulated elastic potential energy, and maintain the stable flow guiding state, thereby realizing the automatic adjustment of the grid plate 121.

[0079] In some embodiments, when the grid plate 121 is in the anti-backflow state, the pressure difference between the first wind pressure and the second wind pressure acting on the wind pressure at the grid plate 121 is greater than or equal to the elastic force of the elastic member 131.

[0080] That is, by adjusting the elastic member 131 with different elastic coefficients, the elastic member 131 can be adapted to the force of different wind pressures.

[0081] It should be noted that in the embodiments of the present disclosure, one grid plate 121 can be connected to the air duct 11 through one or more rotating shafts 1221. One grid plate 121 can also be connected and installed around the corresponding rotating shaft 1221 through one or more elastic members 131, so that the grid plate 121 can spontaneously switch and rotate between the flow guiding state and the anti-backflow state under the action of the negative pressure.

[0082] In some other embodiments, the elastic member 131 can also be configured as a compression spring. That is, when the grid plate 121 is in the flow guiding state, the compression spring is in the initial state without force or in the slightly compressed state. When the grid plate 121 rotates to the backflow prevention state, the elastic member 131 is in the compressed state and accumulates elastic potential energy, and keeps the grid plate 121 in the stable backflow prevention state under the action of negative pressure. When the negative pressure decreases, the compression spring with accumulated elastic potential energy drives the grid plate 121 to rotate to the flow guiding state, and the elastic potential energy decreases.

[0083] It should be noted that, in the process of spontaneous switching movement of the grid plate 121 between the backflow prevention state and the flow guiding state by the action force of the elastic member 131. The action force of the elastic member 131 acting on the grid plate 121 is proportional to the stroke of the elastic member 131 being stretched or compressed. Taking the spring as an example, since the side of the spring away from the rotating shaft 1221 is stretched in the stretching process, and the side of the spring close to the rotating shaft 1221 is compressed in the compression process, the elastic coefficient of the elastic member 131 can be determined according to actual application.

[0084] In some other embodiments, as shown in FIG. 7, in the case where the guide 122 includes the rotating shaft 1221, the driving mechanism 13 further includes a torsion spring 132, the torsion spring 132 is inserted and mounted along the axial direction of the rotating shaft 1221, one end of the torsion spring 132 is in contact with the grid plate 121, and the other end of the torsion spring 131 is in contact with the air duct member 11. When the grid plate 121 is in the backflow prevention state (i.e., the dashed line position in FIG. 7), the torsion spring 131 accumulates elastic potential energy. When the grid plate 121 is in the flow guiding state (i.e., the solid line position in FIG. 7), the elastic potential energy of the torsion spring 131 decreases.

[0085] For example, in the process of rotating switching of the grid plate 121 from the flow guiding state to the backflow prevention state, the windward side of the grid plate 121 is the outer side. As shown in FIG. 7, one end of the torsion spring 132 is in contact with the outer side of the grid plate 121, and the other end of the torsion spring 132 is in contact with the air duct member 11 or the first limiting member 1223. So that when the grid plate 121 rotates to the backflow prevention state, the torsion spring 132 is in the compressed state and accumulates elastic potential energy, and when the external negative pressure is small, the compressed torsion spring 132 releases energy to drive the grid plate 121 to rotate to the flow guiding state, at this time the elastic potential energy of the torsion spring 132 decreases or has no elastic potential energy, and the spontaneous adjustment switching of the grid plate 121 between the flow guiding state and the backflow prevention state can also be realized.

[0086] It should be noted that the stiffness coefficient k of the torsion spring 132 can be determined according to the specifications, models and materials used of the torsion spring 132. In the embodiment of the present disclosure, the angle of the torsion spring 132 rotating between the flow guiding state and the backflow prevention state is θ = 180°. It is defined that the force of the torsion spring 132 acting on the grille plate 121 in the flow guiding state is zero, and then the elastic force of the torsion spring 132 acting on the grille plate 121 is F1 = k x θ x L / 2. Wherein, L is the length dimension of the grille plate 121 along the Y direction in the flow guiding state, and θ is the rotation angle of the grille plate 121 compared with the flow guiding state, and the maximum angle is π.

[0087] In addition, the driving mechanism 13 can also actively switch the position state of the grille plate 121 between the flow guiding state and the backflow prevention state.

[0088] In some embodiments, as shown in FIG. 8, the driving mechanism 13 further includes a power member 133 and an adjusting module 134. As shown in FIGS. 9 and 10, one end of the power member 133 is connected with the air duct member 11, and the other end of the power member 133 is connected with the grille plate 121. The adjusting module 134 is connected with the power member 133, and the adjusting module 134 is configured to:

[0089] When the first wind pressure is higher than the second wind pressure by a preset air pressure value, the adjusting module 134 controls the power member 133 to drive the grille plate 121 to move from the flow guiding state to the backflow prevention state. Otherwise, the adjusting module 134 controls the power member 133 to keep the grille plate 121 in the flow guiding state.

[0090] That is, through the cooperation of the adjusting module 134 and the power member 133, the grille plate 121 can be automatically controlled, and the position state of the grille plate 121 can be flexibly switched between the flow guiding state and the backflow prevention state according to the preset condition. Through the active switching and adjustment of the driving mechanism 13 to the position state of the grille plate 121, the stability of the backflow prevention air duct device 10 can be improved.

[0091] As shown in FIG. 8, the power member 133 includes a driving motor 1331, and the adjusting module 134 is in control connection with the driving motor 1331. As shown in FIG. 9, the output end of the driving motor 1331 is used to drive the grille plate 121 to move and switch between the flow guiding state and the backflow prevention state.

[0092] Taking the grille plate 121 configured to be rotationally connected with the air duct member 11 as an example, one driving motor 1331 can be provided corresponding to one grille plate 121, and the output end of the driving motor 1331 is connected to the position of the grille plate 121 close to the rotating shaft 1221, so that the driving motor 1331 can directly drive the grille plate 121 to switch and rotate between the flow guiding state and the backflow prevention state.

[0093] Alternatively, a transmission gear can be connected at the position of the grid plate 121 close to the rotating shaft 1221, and the transmission gears of the plurality of grid plates 121 are connected to the driving gear of the same driving motor 1331 through a chain or a transmission belt, so that the driving motor 1331 can drive the plurality of grid plates 121 to switch and rotate between the flow guiding position state and the backflow preventing position state.

[0094] Alternatively, the grid plate 121 can also be switched and slid along the Y direction between the flow guiding state and the backflow preventing state under the driving of the driving motor 1331 through the cooperation of the gear and the rack, which is not limited.

[0095] The driving motor 1331 can be a direct current motor, an alternating current motor, a stepping motor or a servo motor, which is not limited.

[0096] In some embodiments, referring to FIGS. 8 and 10, the power member 133 further includes a driving link 1332 and a driving cylinder 1333. One end of the driving link 1332 is connected with the air duct member 11, and the other end of the driving link 1332 is connected with the grid plate 121. The driving cylinder 1333 is connected between the driving links 1332. Or the driving cylinder 1333 is connected between the driving link 1332 and the air duct member 11. The adjusting module 134 is connected with the driving cylinder 1333 for control, and is used to control the grid plate 121 to move and switch between the flow guiding state and the backflow preventing state.

[0097] In this way, the driving cylinder can be controlled to be elongated or shortened by the adjusting module 134, and is matched with the driving link 1332 to drive the grid plate 121 to rotate and adjust or slide between the flow guiding state and the backflow preventing state. The driving cylinder 1333 and the driving link 1332 can be flexibly configured and installed according to different requirements of the grid plate 121, which is flexible and convenient.

[0098] It should be noted that in the embodiments of the present disclosure, when the adjusting module 134 adjusts and switches the position state of the grid plate 121 according to different preset conditions, the adjusting module 134 can obtain the first air pressure and the second air pressure through the air pressure sensor, and compare the difference between the first air pressure and the second air pressure with the preset air pressure value to adjust the position state of the grid plate 121.

[0099] Alternatively, the adjusting module 134 can also judge the values of the first air pressure and the second air pressure according to different rotating speeds of the power fan, and calculate the difference between the two values and the preset air pressure value to adjust the position state of the grid plate 121, which is not limited.

[0100] In another aspect, the embodiments of the present disclosure also provide a computer device, as shown in FIGS. 11 and 12, which comprises the anti-backflow air duct device 10, the case 20, the power module 30 and the case fan 40 in the previous aspect.

[0101] As shown in FIGS. 11 and 12, the case 20 is provided with a receiving cavity 21, and the receiving cavity 21 is provided with an air outlet 22 at one end along a first linear direction. The power module 30 is installed in the receiving cavity 21 and is arranged close to the air outlet 22 along the first linear direction (i.e., the Y direction). Along the first linear direction, the end of the power module 30 away from the air outlet 22 is an air inlet end, which is in communication with the second air vent 113. The power module 30 is provided with a module fan 31 to drive air to flow into the power module 30 along the first linear direction through the air duct piece 11. In the receiving cavity 21, the case fan 40 is arranged close to the air inlet end of the power module 30 along the first linear direction to drive air to flow through the case fan 40 along the first linear direction. The case fan 40 is arranged on one side of the power module 30 along a second linear direction, which is perpendicular to the first linear direction.

[0102] That is, through the arrangement of the anti-backflow air duct device 10, the position state of the grille plate 121 in the case 20 of the computer device 100 can be flexibly switched between the flow guiding position state and the anti-backflow position state. When the rotating speed of the case fan 40 is rapidly increased, the grille plate 121 is switched to the anti-backflow state to prevent the leakage of air on the air inlet side of the power module 30, so as to ensure that the power module 30 has sufficient air for heat dissipation. When the rotating speed of the case fan 40 is reduced, the grille plate 121 automatically returns to the flow guiding state, which does not affect the heat dissipation effect of the system mainboard and the power module.

[0103] Moreover, since the computer device 100 is a structural side scheme corresponding to the anti-backflow air duct device 10 in the previous aspect, the computer device 100 has all the beneficial effects of the anti-backflow air duct device 10, which will not be described here.

[0104] In some embodiments, as shown in FIG. 13, the computer device 100 further comprises a master control module 50 connected with at least the case fan 40 and the module fan 31. The master control module 50 is configured to:

[0105] When the internal temperature of the case 20 is less than or equal to the preset temperature, the master control module 50 adjusts the rotating speed of the case fan 40 and the rotating speed of the module fan 31, so that the air pressure difference at the air inlet side of the case fan 40 and the first air vent 112 is less than the preset air pressure value.

[0106] For example, the main control module 50 can be a component of a baseboard management controller. When adjusting the rotation speed of the case fan 40 and the module fan 31, the main control module 50 can first detect the current temperature of the system mainboard 60 and the power supply board 32 in FIGS. 11 and 12, and when the temperature of both is less than or equal to a preset temperature, the main control module 50 adjusts the case fan 40 and the module fan 31 so that the second air pressure on the air inlet side of the case fan 40 and the second air pressure on the air inlet side of the module fan 31 are approximately equal or have a small air pressure difference, thereby maintaining stable heat dissipation of the system mainboard 60 and the power supply board 32.

[0107] Alternatively, when the temperature of the system mainboard 60 is relatively high, the main control module 50 detects the current temperature of the power supply board 32. If the temperature of the power supply board 32 is greater than the preset temperature, the rotation speed of the case fan 40 and the module fan 31 is simultaneously increased to simultaneously and rapidly dissipate heat. If the temperature of the power supply board 32 is less than or equal to the preset temperature, only the rotation speed of the case fan 40 is increased to rapidly dissipate heat of the system mainboard 60. In this process, if the first air pressure is higher than the second air pressure by a preset value, the grid plate 121 can be automatically rotated to the anti-backflow state under the action of the air pressure, or the grid plate 121 is moved to the anti-backflow state by adjusting the module 134.

[0108] Since the air pressure of a fan is related to the air volume and the rotation speed, the air pressure of different fans is different. When the case fan 40 is normally operated, according to the heat dissipation control strategy, the main control module 50 controls the rotation speed of the case fan 40 to be S, and according to the model of the case fan 40, the air pressure value A corresponding to the rotation speed is found on the P-Q curve shown in FIG. 14. Similarly, the main control module 50 sets the rotation speed of the module fan 31 to be S1, and according to the model of the main control module 50, the air pressure value B corresponding to the rotation speed is obtained.

[0109] Under normal working conditions, there is a coefficient relationship n between the air pressure A of the case fan 40 and the air pressure B of the module fan 31, and A and B can be approximately linear functions A = n * B + z. At this time, considering that the case fan 40 and the module fan 31 have different structural positions and different air duct paths, the coefficient n and the constant z have different parameters, so that A and B reach a balanced state and backflow is not generated. The grid plate 121 is not forced to be in the flow guide state shown in FIG. 11.

[0110] In order to ensure that the rotation speed of the module fan 31 is only adjusted according to the temperature state of the power supply module 30 itself and is not affected by other external factors (here, mainly the rotation speed of the case fan 40). Since the power consumption of the power supply module 30 body loss is constant, it means that the temperature of the internal power supply board 32 of the power supply module 30 is constant. In addition, the internal temperature of the power supply module 30 is also related to the temperature of the air inlet, and in the case of constant ambient temperature, it can be considered that the temperature of the air inlet is constant.

[0111] Taking the air temperature of the air inlet as 25° as an example, when the temperature of a certain component inside the system mainboard 60 exceeds the preset temperature, the chassis fan 40 is accelerated, and the main control module 50 sets the speed of the chassis fan 40 as S' at this time. On the P-Q curve of the chassis fan 40 shown in FIG. 14, the air pressure value corresponding to the speed at this time is A'. The main control module 50 does not change the speed of the module fan 31 in the interval in which the speed of the chassis fan 40 is accelerated from S to S'.

[0112] During the process in which the air pressure value of the chassis fan 40 changes from A to A', the second air pressure value on the air inlet side of the chassis fan 40 decreases significantly, so that the first air pressure at the first air inlet 112 is higher than the preset air pressure value of the second air pressure, and the air pressure difference generated thereby draws air from the original backflow path (i.e., the air inlet side of the first air inlet 112 or the power module 30). However, due to the arrangement of the grid plate 121, the air pressure difference is applied to the grid plate 121, which drives the grid plate 121 to rotate counterclockwise to the anti-backflow state shown in FIG. 12.

[0113] Taking the grid plate 121 that is rotatably installed and is switched between the flow guiding state and the anti-backflow state by the elastic member 131 or the torsional spring 132 as an example, during the above process, the pressure difference acting force F2 applied to the grid plate 121 is F2 = ΔP × S. Wherein, ΔP can be regarded as the difference between the first air pressure and the second air pressure, and the second air pressure is kept stable, that is, the change value from A to A' of the chassis fan 40 is the difference between the first air pressure and the second air pressure. S represents the area of each grid plate 121.

[0114] Based on this, taking the grid plate 121 that is switched between the flow guiding state and the anti-backflow state by the torsional spring 132 as an example. During this process, the pressure difference acting force F2 is greater than the elastic force F1 of the torsional spring, so that the grid plate 121 is automatically rotated from the flow guiding state to the anti-backflow state, and is kept stable in the anti-backflow state under the action of the first limiting member 1223, so as to prevent air leakage from the air inlet side of the power module 30 to the air inlet side of the system fan 40. And when the grid plate 121 rotates to the anti-backflow state, the rotation angle θ is maximum, and is π.

[0115] Correspondingly, when the pressure difference acting force is less than the elastic force of the torsional spring, the grid plate 121 is automatically rotated from the anti-backflow state to the flow guiding state under the action of the torsional spring 132, and is kept stable in the flow guiding state under the action of the second limiting member 1224, which is conducive to improving the air flow on the air inlet side of the power module 30.

[0116] Although the embodiments of the present disclosure are described in conjunction with the drawings, various modifications and changes can be made by those skilled in the art without departing from the spirit and scope of the present disclosure, and such modifications and changes fall within the scope defined by the appended claims.

[0117] LIST OF REFERENCE NUMBERS: 100, computer device; 10, backflow prevention air duct device; 11, air duct piece; 111, air duct cavity; 112, first ventilation opening; 113, second ventilation opening; 12, flow guide assembly; 121, grid plate; 122, guide piece; 1221, rotating shaft; 1222, guide portion; 1223, first limiting piece; 1224, second limiting piece; 13, driving mechanism; 131, elastic piece; 132, torsional spring; 133, power piece; 1331, driving motor; 1332, driving connecting rod; 1333, driving cylinder; 134, adjusting module; 20, case; 21, containing cavity; 22, air outlet; 30, power module; 31, module fan; 32, power board; 40, case fan; 50, main control module; 60, system mainboard.

Claims

1. An anti-backdraft duct apparatus, characterized by, The anti-backflow air duct device comprises: an air duct member having an air duct cavity and a first air vent and a second air vent sequentially communicating with two ends of the air duct cavity; and a guide assembly comprising a grid plate and a guide member, the grid plate being located at one end of the air duct cavity close to the first air vent, and the grid plate being connected and arranged with the air duct member through the guide member; the guide assembly having a guide state and an anti-backflow state, wherein when the guide assembly is in the guide state, the grid plate is located in the air duct cavity, and when the guide assembly is in the anti-backflow state, the grid plate is at least partially moved to outside the air duct cavity through the first air vent to increase the guide length of the air duct cavity.

2. The anti-backflow air duct device of claim 1, wherein The anti-backflow air duct device further comprises: a driving mechanism connected and arranged with the air duct member and / or the guide member, and one end of the driving mechanism being connected with the grid plate; taking the plane where the first air vent is located as a reference plane, in the reference plane, the wind pressure at the first air vent is defined as a first wind pressure, and the wind pressure outside the first air vent is defined as a second wind pressure; the driving mechanism is configured to: when the first wind pressure is higher than the second wind pressure by a preset air pressure value, the driving mechanism drives the grid plate to move from the guide state to the anti-backflow state; otherwise, the driving mechanism drives the grid plate to be in the guide state.

3. The anti-backflow air duct device of claim 2, wherein the guide member comprises a rotating shaft, the grid plate is rotationally connected with the air duct member through the rotating shaft, so as to rotationally adjust the grid plate between the guide state and the anti-backflow state.

4. The anti-backflow air duct device of claim 3, wherein the guide member further comprises a guide portion arranged in a first linear direction.

5. The anti-backflow air duct device of claim 4, wherein the guide member comprises two guide portions respectively arranged on opposite sides of the inner wall of the air duct member, and the grid plate is mounted between the two guide portions.

6. The anti-backflow air duct device of claim 4, wherein the guide portion is a guide rail structure or a guide groove structure extending in the first linear direction.

7. The anti-backflow air duct device of claim 3, wherein the guide member comprises: a first limiting member connected and arranged with the air duct member, when the grid plate is rotated from the guide state to the anti-backflow state, the first limiting member is in contact with the grid plate to prevent the grid plate from continuing to rotate; and / or a second limiting member connected and arranged with the air duct member, when the grid plate is rotated from the anti-backflow state to the guide state, the second limiting member is in contact with the grid plate to prevent the grid plate from continuing to rotate.

8. The anti-backflow air duct device of claim 7, wherein the first limiting member and the second limiting member are an integral member.

9. The anti-backflow air duct device of claim 2, wherein the driving mechanism comprises an elastic member; one end of the elastic member is connected and arranged with the guide member and / or the air duct member, and the other end of the elastic member is connected with the grid plate; when the grid plate is in the anti-backflow state, the elastic member is in a tensile state or a compression state and accumulates elastic potential energy; when the grid plate is in the guide state, the elastic potential energy of the elastic member decreases.

10. The anti-backflow air duct device of claim 9, wherein, when the grid plate is in the anti-backflow state, the pressure difference between the first wind pressure and the second wind pressure acting on the wind pressure at the grid plate is greater than or equal to the elastic force of the elastic member.

11. The anti-backflow air duct device of claim 2, wherein in the case that the guide member comprises a rotating shaft, the driving mechanism further comprises: A torsion spring is inserted into the rotating shaft in the axial direction of the rotating shaft, one end of the torsion spring is in contact with the grid plate, and the other end of the torsion spring is in contact with the air duct piece; When the grid plate is in the backflow prevention state, the torsion spring accumulates elastic potential energy; When the grid plate is in the flow guiding state, the elastic potential energy of the torsion spring decreases.

12. The anti-backflow air duct device of claim 11, wherein, The elastic force F1 of the torsion spring acting on the grid plate is k*θ*L / 2; The pressure difference F2 of the first wind pressure and the second wind pressure acting on the grid plate is △P*S; When the pressure difference is greater than the elastic force, that is, F2≥F1, the grid plate rotates from the flow guiding state to the backflow prevention state; Wherein, k is the stiffness coefficient of the torsion spring, θ is the rotation angle of the grid plate compared with the flow guiding state, S is the area of the grid plate, and △P is the difference between the first wind pressure and the second wind pressure.

13. The anti-backflow air duct device according to any one of claims 1 to 12, characterized in that, The air duct cavity extends in the first straight line direction at least at the first air vent; The number of the grid plates is multiple, and one grid plate is connected to the air duct piece through at least one guide piece; When the flow guiding assembly is in the flow guiding state and / or the backflow prevention state, multiple grid plates are distributed along the second straight line direction. The first straight line direction is perpendicular to the second straight line direction.

14. The anti-backflow air duct device of claim 13, wherein, When the flow guiding assembly is in the flow guiding state and / or the backflow prevention state; The length of the grid plate along the first straight line direction is less than the interval of the adjacent two grid plates along the second straight line direction.

15. An anti-backflow air duct device according to any one of claims 2 to 11, characterized in that The driving mechanism further comprises: A power piece, one end of the power piece is connected to the air duct piece, and the other end of the power piece is connected to the grid plate; And an adjustment module, the adjustment module is connected to the power piece, and the adjustment module is configured to: When the first wind pressure is higher than the second wind pressure by a preset air pressure value, the adjustment module controls the power piece to drive the grid plate to move from the flow guiding state to the backflow prevention state; Otherwise, the adjustment module controls the power piece to keep the grid plate in the flow guiding state.

16. The anti-backflow air duct device of claim 15, wherein, The power piece includes a driving motor, and the adjustment module is connected to the driving motor; The output end of the driving motor is used to drive the grid plate to move and switch between the flow guiding state and the backflow prevention state.

17. The anti-backflow air duct device of claim 15, wherein, The power piece further comprises: A driving link, one end of the driving link is connected to the air duct piece, and the other end of the driving link is connected to the grid plate; And a driving cylinder, the driving cylinder is connected between the driving links, or the driving cylinder is connected between the driving links and the air duct piece; the adjustment module is connected to the driving cylinder for control, and is used to control the grid plate to move and switch between the flow guiding state and the backflow prevention state.

18. The anti-backflow air duct device of claim 16, wherein, A transmission gear is arranged at the position of the grid plate close to the rotating shaft, and the transmission gears of multiple grid plates are connected to the driving gear of the driving motor through a chain or a transmission belt, so that the driving motor can drive multiple grid plates to switch and rotate between the flow guiding position state and the backflow prevention position state.

19. A computer device, comprising: Comprising: a case, wherein a receiving cavity is arranged inside the case, and an air outlet is arranged at one end of the receiving cavity along a first linear direction; The anti-backflow air duct device according to any one of claims 1 to 18; a power module, wherein the power module is arranged inside the receiving cavity and is arranged close to the air outlet along the first linear direction; along the first linear direction, one end of the power module away from the air outlet is an air inlet end, the air inlet end is in communication with the second air vent, and a module fan is arranged inside the power module to drive air to flow into the power module along the first linear direction through the air duct piece; and a case fan, wherein the case fan is arranged close to the air inlet end of the power module along the first linear direction inside the receiving cavity to drive air to flow through the case fan along the first linear direction, and the case fan is arranged on one side of the power module along a second linear direction, wherein the second linear direction is perpendicular to the first linear direction.

20. The computer device of claim 19, wherein, The computer device further comprises: a main control module, wherein the main control module is connected with at least the case fan and the module fan; and the main control module is configured to: when the internal temperature of the case is less than or equal to a preset temperature, the main control module adjusts the rotating speed of the case fan and the rotating speed of the module fan, so that the air pressure difference between the air inlet side of the case fan and the first air vent is less than a preset air pressure value.

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