CN113365481A

CN113365481A - Anti-backflow method and device applied to heat dissipation equipment and heat dissipation system

Info

Publication number: CN113365481A
Application number: CN202110727127.3A
Authority: CN
Inventors: 田颖; 曹凯
Original assignee: Xian Yep Telecommunication Technology Co Ltd
Current assignee: Xian Yep Telecommunication Technology Co Ltd
Priority date: 2021-06-29
Filing date: 2021-06-29
Publication date: 2021-09-07
Anticipated expiration: 2041-06-29
Also published as: CN113365481B

Abstract

The invention discloses an anti-backflow method and device applied to heat dissipation equipment and a heat dissipation system. The heat dissipation equipment comprises at least two fans arranged side by side and anti-backflow sheets made of magnetic materials and arranged corresponding to the fans; the backflow prevention method comprises the following steps: acquiring the working state of the fan; setting the operating parameters of the electromagnetic assembly according to the working state; and sending the operation parameters to the electromagnetic assembly so that the electromagnetic assembly controls the opening and closing state of the anti-backflow sheet to be matched with the working state of the fan based on the operation parameters. The electromagnetic assembly is controlled, so that the backflow preventing piece is suitable for various working states of the fan of the heat dissipation equipment, normal air supply of the fan can be guaranteed no matter in a normal blowing or exhausting state, and the backflow preventing piece can be closed to the fan once the blowing or exhausting failure occurs to the fan, airflow backflow cannot occur, and therefore the heat dissipation effect of the heat dissipation equipment is guaranteed.

Description

Anti-backflow method and device applied to heat dissipation equipment and heat dissipation system

Technical Field

The invention relates to the technical field of backflow prevention and heat dissipation, in particular to a backflow prevention method and device applied to heat dissipation equipment and a heat dissipation system.

Background

When heat dissipation equipment such as electric fan units works, a plurality of fans can work simultaneously to guarantee the heat dissipation effect, and on one side of an air supply outlet of each fan, the working mode of executing air supply generally comprises blowing and air draft.

When any one of the fans fails and stops rotating, the rest fans still perform air supply normally, and at the moment, because the failed fan cannot generate thrust, airflow flows back to the air inlet from the air outlet of the failed fan because the pressure at the air outlet is greater than the pressure at the air inlet. The airflow back flow can increase wind resistance, so that the heat dissipation of the whole electric fan unit cannot be guaranteed, and other adverse effects such as noise are brought.

In order to solve the above problem, a device such as a backflow prevention sheet is generally installed at an air outlet of the heat dissipation apparatus. However, in order to adapt to the working mode of the heat dissipation object, in practice, the fan of the heat dissipation device also needs to be adjusted continuously, that is, the air supply mode is switched between blowing and exhausting, and the backflow prevention device which is set for a certain air supply mode alone needs to be replaced, installed and set in another air supply mode, which causes inconvenience.

Disclosure of Invention

The invention provides a backflow prevention method, a backflow prevention device and a heat dissipation system, and aims to overcome the defects that in the prior art, a backflow prevention device is low in compatibility with heat dissipation equipment and is not flexible in arrangement.

The invention solves the technical problems through the following technical scheme:

the invention provides an anti-backflow method applied to heat dissipation equipment, wherein the heat dissipation equipment comprises at least two fans arranged side by side and anti-backflow sheets made of magnetic materials and arranged corresponding to the fans; the backflow prevention method comprises the following steps:

acquiring the working state of the fan;

setting the operating parameters of the electromagnetic assembly according to the working state;

and sending the operation parameters to the electromagnetic assembly so that the electromagnetic assembly controls the opening and closing state of the anti-backflow sheet to be matched with the working state of the fan based on the operation parameters.

Preferably, the working state comprises a normal state and a failure state;

the step of sending the operating parameter to the electromagnetic assembly so that the electromagnetic assembly controls the opening and closing state of the anti-backflow sheet to be matched with the working state of the fan based on the operating parameter specifically includes:

if the working state is a normal state, the electromagnetic assembly is used for controlling the anti-backflow sheet to be opened according to the operation parameters;

and if the working state is a failure state, the electromagnetic assembly is used for controlling the anti-backflow sheet to be closed according to the operation parameters.

Preferably, the operating parameter comprises a current parameter;

the step of setting the operating parameters of the electromagnetic assembly according to the operating state specifically includes:

if the working state is a normal state, setting the current to be zero or setting the current direction to be a first direction;

if the working state is a failure state, setting the current direction as a second direction;

wherein the first direction is opposite to the second direction, and the current in the first direction is used for enabling the electromagnetic assembly to generate a magnetic force repelling the anti-reflux sheet; the current in the second direction is used for enabling the electromagnetic assembly to generate magnetic force attracting the anti-backflow sheet.

Preferably, the normal state comprises normal blowing and normal air draft; the failure state comprises blowing failure and air draft failure; the opening direction of the anti-backflow sheet is consistent with the blowing direction of the fan;

the step of setting the operating parameters of the electromagnetic assembly according to the operating state comprises:

setting a current value of the electromagnetic assembly according to the working state;

if the working state is normal blowing, setting the current value as a first current value;

if the working state is normal air draft, setting the current value as a second current value;

if the working state is blowing failure, setting the current value as a third current value;

if the working state is failure of air draft, setting the current value as a fourth current value;

wherein the first current value is less than the second current value; the third current value is less than the fourth current value.

Preferably, the step of setting the operating parameters of the electromagnetic assembly according to the operating state specifically includes:

the first current value set when the backflow prevention tab is positioned above the fan is greater than the first current value set when the backflow prevention tab is positioned below the fan;

the second current value set when the backflow prevention tab is positioned above the fan is larger than the second current value set when the backflow prevention tab is positioned below the fan;

the third current value set when the backflow prevention tab is positioned above the fan is smaller than the third current value set when the backflow prevention tab is positioned below the fan;

the fourth current value set when the backflow prevention tab is positioned above the fan is smaller than the fourth current value set when the backflow prevention tab is positioned below the fan.

The invention also provides a backflow prevention device applied to the heat dissipation equipment, the heat dissipation equipment comprises at least two fans arranged side by side and backflow prevention pieces made of magnetic materials and arranged corresponding to the fans, and the backflow prevention device comprises a controller and an electromagnetic assembly;

the electromagnetic assemblies are arranged on the edges of the two sides of the air supply outlet of the fan; the controller is electrically connected with the electromagnetic assembly;

the controller is used for executing the backflow prevention method applied to the heat dissipation device, so that the opening and closing state of the backflow prevention piece is matched with the working state of the fan by controlling the electromagnetic assembly.

Preferably, the fan comprises a PIN interface, and the controller is configured to read the PIN interface to obtain the operating state.

Preferably, the backflow prevention device further comprises a gravity sensing device arranged on the fan, and the gravity sensing device is used for detecting the direction of an air supply outlet of the fan and sending the direction of the air supply outlet to the controller;

the controller is also used for setting current parameters of the electromagnetic assembly according to the working state and the direction of the air supply outlet.

Preferably, the backflow prevention device further comprises a wind power detection device for detecting a first wind power value of an air supply outlet of the fan and sending the first wind power value to the controller;

the controller is also used for setting operation parameters according to the working state and the first wind power value.

Preferably, the backflow prevention device further comprises a connection part;

the middle shaft of the air supply outlet of each fan is provided with one connecting part;

the electromagnetic assemblies are respectively arranged on the edges of the two sides of the air supply outlet of each fan;

every connecting portion swing joint has two prevent the refluence piece, two prevent the refluence piece with connecting portion are the upset of axle to open or close.

The invention also provides a heat dissipation system, which comprises heat dissipation equipment and the backflow prevention device;

the heat dissipation device comprises at least two fans arranged side by side and anti-backflow sheets made of magnetic materials and arranged corresponding to the fans.

The positive progress effects of the invention are as follows: the invention provides the backflow preventing method and device applied to the heat radiating equipment and the heat radiating system, so that the backflow preventing sheet is suitable for various working states of the fan of the heat radiating equipment, normal air supply of the fan can be ensured no matter in a normal blowing or exhausting state, and the backflow preventing sheet can be closed to the fan once the blowing or exhausting failure occurs, airflow backflow cannot occur, and the heat radiating effect of the heat radiating equipment is ensured.

Drawings

Fig. 1 is a flowchart of a backflow prevention method applied to a heat dissipation device in embodiment 1 of the present invention.

Fig. 2A is a schematic view of an open/close state of the backflow prevention sheet corresponding to normal blowing of the fan in embodiment 1 of the present invention.

Fig. 2B is a schematic view of the opening and closing state of the backflow prevention piece corresponding to normal air draft of the fan in embodiment 1 of the present invention.

Fig. 2C is a schematic view of an open/close state of the backflow prevention sheet corresponding to a fan failure state in embodiment 1 of the present invention.

Fig. 3A is a schematic view of an open/close state of the anti-backflow sheet located above the fan in embodiment 1 of the present invention.

Fig. 3B is a schematic view of an open/close state of the anti-backflow sheet located below the fan in embodiment 1 of the present invention.

Fig. 4 is an overall side view of a heat dissipating device and a backflow prevention device applied to the backflow prevention device of the heat dissipating device in embodiment 2 of the present invention.

Fig. 5 is an overall front view of a heat dissipating device and a backflow prevention device applied to the backflow prevention device of the heat dissipating device in embodiment 2 of the present invention.

Fig. 6 is a top view of the heat dissipating device and the backflow preventing device applied to the backflow preventing device of the heat dissipating device in embodiment 2 of the present invention.

Fig. 7 is a schematic view of a heat dissipation system in embodiment 3 of the present invention.

Fig. 8 is a schematic diagram illustrating switching of an open/close state of the backflow prevention chip in embodiment 3 of the present invention.

Detailed Description

The invention is further illustrated by the following examples, which are not intended to limit the scope of the invention.

Example 1

The embodiment provides a backflow prevention method applied to heat dissipation equipment, wherein the heat dissipation equipment comprises at least two fans arranged side by side and backflow prevention pieces made of magnetic materials and arranged corresponding to the fans. Referring to fig. 1, the backflow prevention method includes the steps of:

s1, acquiring the working state of a fan;

s2, setting operation parameters of the electromagnetic assembly according to the working state;

and S3, transmitting the operation parameters to the electromagnetic assembly so that the electromagnetic assembly controls the opening and closing state of the anti-backflow sheet to be matched with the working state of the fan based on the operation parameters.

In this embodiment, the heat dissipation device is specially configured for heat dissipation of other main devices with higher power and higher heat productivity, and may be a fan unit generally. The heat dissipation device may be provided on the main device itself, that is, integrally formed, or may be provided as a separate device attached to the main device. In contrast, the latter has more application scenes, so that the heat dissipation device can be used for main devices with different powers, structures and materials; flexibly allocating the number, the position and the material of the fans; the energy consumption is controlled while a better heat dissipation effect is achieved.

In view of the backflow prevention method according to the present embodiment, the heat dissipation device includes at least two fans arranged side by side. For the working state of the fan, the following definitions are made in the embodiments of the present application: normal state-means that the fan is performing normal air supply, wherein normal blowing (i.e. blowing air in a direction away from the main device, usually designed as air exhaust for the main device) and normal air draft (i.e. blowing air in a direction opposite to the normal blowing air, designed for ventilating the inside of the main device) are included in the air supply direction. And a failure state corresponding to the normal state, that is, the fan stops rotating and no more supplies air. The failure state also comprises blowing failure and air draft failure, wherein the blowing failure means that other fans blow normally while the fans are in the failure state; and the failure of air draft means that the fan is in a failure state, and other fans can normally draft air.

When one fan fails and does not supply air any more, at least one other fan still supplies air normally, so that the backflow prevention phenomenon can be generated. For a detailed description of the principles, reference is made to the background art and to the general knowledge in gas dynamics, which is not described in detail in this embodiment. Accordingly, the side-by-side arrangement of the fans in the embodiment is not a limitation, but is to illustrate the application scenario and premise of the backflow prevention method of the embodiment, that is, the backflow is generated, and in most cases, the backflow is generated due to the side-by-side arrangement of the fans.

Most importantly, as a technical implementation guarantee of the embodiment, the fan of the heat dissipation device is correspondingly provided with the backflow prevention sheet made of the magnetic material, and the backflow prevention method of the embodiment is specifically implemented based on control over the backflow prevention sheet. It will be understood by those skilled in the art that the anti-backflow sheet of magnetic material may be partially or wholly made of magnetic material, or may be made of non-magnetic material, and the surface is attached with magnetic core material attachments, such as magnetic attachment interlayers, etc. And for each fan, a corresponding anti-backflow sheet is provided. Under the precondition, the step S1 obtains the operating state of the fan, the step S2 sets the electromagnetic assembly according to the operating state, and the step S3 sends the operating parameter to the electromagnetic assembly, so that the electromagnetic assembly controls the opening and closing state of the anti-backflow sheet based on the operating parameter to be matched with the operating state of the fan.

In step S1, the controller can directly read the PIN signal of the fan to determine the working state of the fan (normal or invalid, and when normal, blowing or exhausting); the judgment can also be directly carried out through an external wind sensing system; of course, the obtaining of the working state includes, but is not limited to, the above two manners.

For step S2, the present embodiment controls the electromagnetic assembly to emit magnetic force based on the control of the operating parameters of the electromagnetic assembly, and since the anti-backflow sheet is made of magnetic material, the electromagnetic assembly can control the opening and closing of the anti-backflow sheet. In the present embodiment, the method of controlling is related, and therefore, the specific setting position of the electromagnetic assembly is not limited, and the electromagnetic assembly only needs to be capable of meeting the requirements of receiving the corresponding control signal, and directly influencing and controlling the backflow preventing chip through the magnetic force.

Regarding step S3, considering that the failure of the fan is only a relatively low probability accident, the fan set is in a normal working state in most cases, and as described in the background, considering that the blowing direction of the fan set is directly changed or switched between blowing and exhausting without changing the setting position. Therefore, the opening and closing state of the anti-backflow sheet corresponding to the fan is set according to the corresponding requirements of various working states of the fan. For example, if a fan fails, it is necessary to close its supply vent to prevent backflow. If the air blower works normally, the normal operation of blowing or exhausting air needs to be ensured.

This embodiment is through establishing the anti-reflux piece into magnetic means, and make the state of opening and shutting and fan operating condition looks adaptation of anti-reflux piece through the control to the operating parameter of electromagnetic component, it can't keep the anti-reflux effect after the air supply direction of fan changes to have solved current anti-reflux device, and need assemble the drawback that anti-reflux device guaranteed the anti-reflux effect again in other positions of fan, can make the anti-reflux piece once only install the back in place, all possible operating condition to the fan carries out the adaptation, thereby greatly increased anti-reflux device's suitability when guaranteeing the anti-reflux effect.

In the present embodiment, a description will be given of a control method of the electromagnetic unit when the operating state is in the normal state and the failure state, respectively, as a preferred embodiment.

If the working state is the normal state, in step S3, the electromagnetic assembly is used for controlling the opening of the anti-backflow sheet according to the operation parameters; if the operating state is a failure state, the electromagnetic assembly is used to control the closing of the backflow prevention piece according to the operation parameters in step S3.

Referring to fig. 2A and 2B, normal blowing and normal exhausting are respectively performed in a normal state, and the operation parameters of the electromagnetic assembly are controlled to keep the anti-backflow sheet open. And fig. 2C shows that when the working state is the failure state, the operation parameters of the electromagnetic assembly need to be controlled to keep the anti-backflow sheet closed, so as to prevent the backflow phenomenon.

The present embodiment further illustrates a control manner of the backflow prevention method of the present embodiment on the operation parameters of the electromagnetic assembly when the working state of a certain fan is a normal state and a failure state, respectively, so that the opening and closing state of the backflow prevention piece can meet the requirement of backflow prevention.

As a preferred embodiment, the operating parameter in the above embodiment may be a current parameter. Step S2 is specifically implemented as follows:

a1. if the working state is a normal state, setting the current to be zero or setting the current direction to be a first direction;

a2. if the working state is a failure state, setting the current direction as a second direction;

the first direction is opposite to the second direction, and the current in the first direction enables the electromagnetic assembly to generate magnetic force which is repellent to the anti-reflux sheet; the current in the second direction is used for enabling the electromagnetic assembly to generate magnetic force attracting the backflow preventing piece.

This embodiment still sets out according to the demand of the various operating condition's of fan correspondence, sets for the state of opening and shutting of the anti-return piece that the fan corresponds to guarantee anti-return effect and normal air supply simultaneously, specifically, to above-mentioned scene a1, the electric current of first direction makes electromagnetic component produce with the repellent magnetic force of anti-return piece, no matter so the fan is in blowing or convulsions, the anti-return piece is opened and can both be guaranteed its normal work. Referring to fig. 2A and 2C, the open-close states of the backflow prevention piece are respectively a normal state and a failure state, and since the open-close states are opposite, it is necessary to set opposite current directions to implement the open-close states.

On the contrary, when the fan is in a failure state, the backflow-preventing sheet is ensured to be closed to the air supply outlet by a certain external force; and the repulsive magnetic force generated corresponding to the current in the first direction, and the magnetic attraction force generated by the current in the second direction can ensure that the backflow preventing piece is closed.

The control mode of the current parameters of the electromagnetic assembly when the working state is the normal state and the failure state respectively is further limited by the embodiment, and the whole normal operation of the fan set can be guaranteed under two situations of backflow prevention and normal air supply through the setting of the current parameters.

As a preferred embodiment, on the basis of the above embodiment, the normal state is further divided into normal blowing and normal exhausting; the failure state is divided into blowing failure and air draft failure, and parameter setting of the control method is explained.

In the present embodiment, the opening direction of the backflow prevention piece is set to be the same as the blowing direction of the fan. Of course, it can be understood by those skilled in the art that if the direction of the air draft is set to be consistent, the implementation principle is the same, and the implementation process is corresponding, so that the description is not repeated.

Step S2 sets the current value of the electromagnetic assembly as follows specifically according to the operating state:

a3. if the working state is normal blowing, setting the current value as a first current value;

a4. if the working state is normal air draft, setting the current value as a second current value;

a5. if the working state is blowing failure, setting the current value as a third current value;

a6. if the working state is failure of air draft, setting the current value as a fourth current value;

wherein the first current value is smaller than the second current value; the third current value is less than the fourth current value.

In the present embodiment, the principle and meaning of setting the current value is that the magnitude of the magnetic attraction (repulsion) force is changed by the magnitude of the absolute value of the current value, so as to adapt to the fan in the above four operating states.

For scenes a3 and a4, the anti-backflow sheet is required to be opened, as mentioned above, the blowing direction is consistent with the opening direction of the anti-backflow sheet, and the suction direction is consistent with the closing direction of the anti-backflow sheet, so based on the mechanics principle, it can be known that the magnetic repulsion force in the scene a3 is only required to be smaller than that in the scene a4 to maintain the opening of the anti-backflow sheet. Similarly, for the failure state, since the backflow-preventing piece corresponding to the failed fan is attached to the air outlet of the fan by the backflow action from the fan in normal operation when the blowing is failed, the third current value in the scenario of a5 is smaller than the fourth current value in the scenario of a6.

This embodiment has further realized making anti-return piece adaptation in fan operating condition through the control of current value under each operating condition to can also save consumption and heat emission under the radiating prerequisite of assurance, also help holistic radiating effect.

As a preferred embodiment, the present embodiment considers application scenarios of the fan and the anti-backflow sheet when the fan and the anti-backflow sheet are arranged vertically, and further describes operation parameter settings corresponding to the fan operating state in the scenarios of the respective relative arrangement positions.

a7. The first current value set when the backflow prevention sheet is positioned above the fan is larger than the first current value set when the backflow prevention sheet is positioned below the fan;

a8. the second current value set when the backflow prevention sheet is positioned above the fan is larger than the second current value set when the backflow prevention sheet is positioned below the fan;

a9. the third current value set when the backflow prevention sheet is positioned above the fan is smaller than the third current value set when the backflow prevention sheet is positioned below the fan;

a10. the fourth current value set when the backflow prevention tab is positioned above the fan is smaller than the fourth current value set when the backflow prevention tab is positioned below the fan.

For the comparison of the two scenes of a7, when the anti-backflow sheet is located below the fan, the gravity of the anti-backflow sheet itself will generate a resultant force in the opening direction thereof with the magnetic force to open the anti-backflow sheet, whereas when the anti-backflow sheet is located above the fan, the gravity will generate a resultant force in the closing direction of the anti-backflow sheet. Therefore, the first current value set when the backflow preventing fin is positioned above the fan is larger than the first current value set when the backflow preventing fin is positioned below the fan, so as to offset the influence of the gravity of the backflow preventing fin.

Also, for the second current value set at the time of normal draft, the second current value set when the backflow preventing chip is located above the fan is larger than the second current value set when the backflow preventing chip is located below the fan in both scenarios of a8 based on the same principle as described above.

For the two scenes of a9, when the anti-backflow sheet is located below the fan, the gravity of the anti-backflow sheet itself will generate a resultant force with the magnetic force in the opening direction to open the anti-backflow sheet, whereas when the anti-backflow sheet is located above the fan, the gravity will generate a resultant force in the closing direction of the anti-backflow sheet. Therefore, the third current value set when the backflow prevention piece is positioned below the fan is larger than the third current value set when the backflow prevention piece is positioned above the fan, so that the third current value is used for offsetting the influence generated by the gravity of the backflow prevention piece and keeping the backflow prevention piece closed in an attraction mode.

Similarly, for the fourth current value set during normal wind extraction, in the two scenarios of a10, the fourth current value set when the anti-backflow sheet is located below the fan is greater than the fourth current value set when the anti-backflow sheet is located above the fan, so as to counteract the influence of gravity and keep the anti-backflow sheet closed.

Referring to fig. 3A and 3B, the second and third fans from the left are both blowing normally, i.e., the above-mentioned a7 scene. Wherein the anti-backflow sheet of fig. 3A is located above the fan, and the anti-backflow sheet of fig. 3B is located below the fan, at this time, the first current value set in fig. 3A needs to be greater than the first current value set in fig. 3B, so as to "jack up" the anti-backflow sheet to keep normal blowing.

On the contrary, if the first fan from the left is in a blowing failure state, i.e. the above-mentioned a9 scenario, then since the backflow-preventing strip of fig. 3A is located above the fan and the backflow-preventing strip of fig. 3B is located below the fan, in order to close the backflow-preventing strip, the third current value set in fig. 3B needs to be greater than the third current value set in fig. 3A, so as to "pull" the backflow-preventing strip to remain closed to prevent backflow.

The embodiment provides the anti-backflow method, so that the anti-backflow sheet can automatically adapt to the working mode of the heat dissipation device, the fans which normally operate in various air supply states of the heat dissipation device can normally exhaust air, and the failed fans cannot generate airflow backflow, so that the normal operation of the heat dissipation device is ensured. Meanwhile, the current value is set according to different working states, so that energy consumption is saved, and the whole heat dissipation effect is improved.

Example 2

Referring to fig. 4 to 6, the present embodiment further provides a backflow prevention device applied to a heat dissipation apparatus, the heat dissipation apparatus includes at least two fans 1 arranged side by side and backflow prevention fins 2 made of a magnetic material and arranged corresponding to the fans 1, and the backflow prevention device includes a controller and an electromagnetic assembly 3;

the electromagnetic assemblies 3 are arranged on the edges of two sides of an air supply outlet of the fan; the controller is electrically connected with the electromagnetic component 3; the controller is used for executing the backflow prevention method in the embodiment 1 to control the electromagnetic assembly 3 to be matched with the working state of the fan 1.

Wherein fig. 4 is an overall side view of the heat sink and the backflow preventing device, fig. 5 is a front view thereof, and fig. 6 is a plan view thereof.

In a preferred embodiment, the fan 1 comprises a PIN interface, and the controller is configured to read the PIN interface to obtain the operating status.

In the present embodiment, the current operating state of the fan 1, for example, a normal operating state or a failure state, can be obtained by reading the PIN signal of the fan 1. The read signal can be used as a trigger condition of subsequent adaptive operation, and the controller sends out a corresponding instruction to automatically adapt the anti-backflow sheet 2 to the current working state of the fan, so that an anti-backflow effect is achieved.

As a preferred embodiment, the backflow prevention device further comprises a gravity sensing device arranged on the fan 1, and is used for detecting the direction of the air supply outlet of the fan 1 and sending the direction of the air supply outlet to the controller; the controller is also used for setting current parameters according to the working state and the direction of the air supply outlet.

The backflow prevention device of the present embodiment includes a gravity sensing device disposed on the fan 1, specifically, an integrated gravity sensor, in which a cantilever type displacer made of an elastic sensing element and an energy storage spring made of an elastic sensing element are used to drive an electrical contact, thereby completing the conversion from the change of gravity to an electrical signal. Because the setting position of the anti-backflow sheet is related to the current parameter for determining the magnetic force, the orientation of the air supply opening of the fan is obtained by the gravity sensing device, and then the gravity factor in the control of the anti-backflow sheet can be determined, so that the control is more reasonable and accurate.

In a preferred embodiment, the backflow prevention device further comprises a wind force detection device for detecting a first wind force value of the air supply outlet of the fan and sending the first wind force value to the controller. The controller is also configured to set an operating parameter based on the operating condition and the first wind force value.

The backflow prevention device of the present embodiment includes a wind force detection device, specifically, a cup anemometer or a propeller anemometer provided at an air outlet of a fan, and a hot wire anemometer made by using a principle of a heat dissipation rate of an object to be heated and a wind speed may be provided according to a space size; or an ultrasonic anemometer and the like manufactured by utilizing the principle that the sound wave transmission speed is influenced by the wind speed so as to increase and decrease.

The data collected by the anemometer is subjected to multiple statistics between the operation parameters corresponding to the anti-backflow sheet control to obtain an experience distribution model, and the reference set values of the operation parameters corresponding to the wind power measurement parameters are obtained through the experience distribution model, so that the operation parameters can be set for the current controller to form the functions of assisting decision and reference deviation correction, and the efficiency and the accuracy of anti-backflow control are further improved.

As a preferred embodiment, the backflow prevention device further comprises a connection portion 5; a connecting part 5 is arranged at the middle shaft position of the air supply outlet of each fan 1; the edges of two sides of the air supply outlet of each fan are respectively provided with an electromagnetic assembly 3; every connecting portion 5 swing joint has two anti-return pieces 2, and the anti-return piece uses connecting portion 5 to open or be closed as the upset of axle.

This embodiment can form control to the anti-return piece effectively through setting up the connecting portion and the electromagnetic component of integration on the electric fan, and the supply-air outlet of totally closed fan when the anti-return piece is closed does not occupy more spaces when opening, and connecting portion and electromagnetic component all can form detachable rigid coupling with the electric fan simultaneously to convenient installation is in the fan of difference.

This embodiment makes the operating condition that anti-reflux piece can automatic adaptation anti-reflux piece through providing an anti-reflux device, realizes under various operating condition, and the fan can normally the air-out when normal condition, or can not take place the air current backward flow when inefficacy to guarantee heat-radiating equipment's normal operating, ensured the radiating effect.

Example 3

Referring to fig. 7, the present embodiment further provides a heat dissipation system, which includes a heat dissipation device 4 and a backflow prevention device; the backflow prevention device further comprises a connection portion 5. A connecting part 5 is arranged at the middle shaft position of the air supply outlet of each fan 1; the edges of two sides of the air supply outlet of each fan 1 are respectively provided with an electromagnetic assembly 3; each connecting portion 5 is articulated two anti-reflux pieces 2, and when the two anti-reflux pieces 2 use the connecting portion 5 as a rotating axial air supply outlet to overturn to a position parallel to the air supply outlet, the electromagnetic components 3 arranged on the edges of two sides of the fan 1 are respectively attached to the two anti-reflux pieces to seal the air supply outlet. The open/close state of the backflow prevention sheet 2 and the connection portion 5 is changed as shown in fig. 8. Of course, according to the installation position of the electromagnetic assembly 3, the backflow-preventing piece 2 can be turned over in other modes or poses, as long as the air supply opening of the fan 1 is sealed and backflow gas can be blocked.

The setting mode in this embodiment can control the anti-return piece better, and the integrative connection setting mode of anti-return piece and fan also has better control effect and space utilization effect. Of course, those skilled in the art will appreciate that the backflow preventing fins may be provided independently of the fan, and even the electromagnetic assembly may be provided independently of the fan body. The fan can be normally supplied with air and closed when the fan fails by matching the two parts.

The controller is electrically connected with the heat dissipation equipment and the electromagnetic assembly respectively; the electromagnetic component is used for acquiring the working state of the fan from the heat dissipation equipment and setting the current parameter of the electromagnetic component according to the working state; the controller is also used for sending current parameters to the electromagnetic assembly so that the electromagnetic assembly controls the opening and closing state of the anti-backflow sheet based on the operation parameters and is matched with the working state of the fan. The controller may be integrated with the central control unit of the heat dissipation device, or may be provided independently.

This embodiment makes anti-return piece can adapt to cooling system's operating mode automatically through providing a cooling system, realizes the fan homoenergetic of normal operating under the various air supply states of heat-radiating equipment and normally goes out the air to and the fan that became invalid can not take place the air current backward flow, thereby guaranteed heat-radiating equipment's normal operating.

While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that this is by way of example only, and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and scope of the invention, and these changes and modifications are within the scope of the invention.

Claims

1. The backflow prevention method is applied to heat dissipation equipment, and is characterized in that the heat dissipation equipment comprises at least two fans arranged side by side and backflow prevention pieces made of magnetic materials and arranged corresponding to the fans; the backflow prevention method comprises the following steps:

acquiring the working state of the fan;

2. The backflow prevention method applied to a heat dissipation apparatus as set forth in claim 1, wherein the operating state includes a normal state and a failure state;

3. The backflow prevention method applied to a heat dissipation apparatus as set forth in claim 2, wherein the operating parameter includes a current parameter;

4. The backflow prevention method applied to a heat dissipation apparatus as set forth in claim 3, wherein the normal state includes normal blowing and normal exhausting; the failure state comprises blowing failure and air draft failure; the opening direction of the anti-backflow sheet is consistent with the blowing direction of the fan;

5. The backflow prevention method applied to the heat dissipation device as recited in claim 4, wherein the step of setting the operation parameters of the electromagnetic assembly according to the operating state specifically comprises:

6. The backflow prevention device is applied to heat dissipation equipment, and is characterized in that the heat dissipation equipment comprises at least two fans arranged side by side and backflow prevention pieces made of magnetic materials and arranged corresponding to the fans, and the backflow prevention device comprises a controller and an electromagnetic assembly;

the controller is used for executing the backflow prevention method applied to the heat dissipation device according to any one of claims 1 to 5, so that the opening and closing state of the backflow prevention piece is matched with the working state of the fan by controlling the electromagnetic assembly.

7.The backflow prevention device applied to a heat dissipation apparatus as recited in claim 6,

the fan comprises a PIN interface, and the controller is used for reading the PIN interface to acquire the working state.

8. The backflow prevention device applied to a heat dissipation apparatus as recited in claim 7,

the anti-backflow device further comprises a gravity sensing device arranged on the fan and used for detecting the direction of an air supply outlet of the fan and sending the direction of the air supply outlet to the controller;

9. The backflow prevention device applied to a heat dissipation apparatus as recited in claim 6,

the backflow preventing device further comprises a wind power detection device, and the wind power detection device is used for detecting a first wind power value of an air supply outlet of the fan and sending the first wind power value to the controller;

10. The backflow prevention device applied to a heat dissipation apparatus as recited in claim 6,

the backflow prevention device further comprises a connecting part;