Module temperature control method of cabinet

Abstract

The invention discloses a module temperature control method of a cabinet, and belongs to the technical field of electronic mechanical structures. The cabinet comprises a cabinet body, a case, a module, a heat dissipation unit and a heat exchanger, wherein a plurality of axial flow fans with adjustable wind speed are arranged at the tail part of the heat dissipation unit. The method comprises the steps that the temperature of a module is collected after a cabinet operates stably, the difference value delta T between the highest value and the lowest value of the temperature of the module, the highest temperature Tmax of the module and the lowest temperature Tmin of the module are obtained, the corresponding fan air volume is judged and adjusted through a program till the Tmax and the Tmin belong to [TLL and TUL], delta T is smaller than or equal to delta Tmax, or the air volumes of all the fans are not changed before and after adjustment, and the upper limit value interval of the tolerable temperature of the module is [TLL and TUL]. The module can meet the temperature requirement, the temperature difference between the modules is effectively controlled, and the heat dissipation efficiency of the system is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of electronic mechanical structures. Background Art

[0002] In the current technical design of electronic sealed cabinets, as the power consumption of modules increases, the requirements for module temperature uniformity continue to increase, which puts forward higher requirements for the heat dissipation structure design and temperature regulation control design of electronic sealed cabinets. In existing electronic sealed cabinets, the heat dissipation design of modules mostly adopts the structural design form of serial ventilation. The cold air passes through the first layer of modules for heat exchange and the hot air blown out is used for heat dissipation of the next layer of modules. This design form leads to large differences in the heat dissipation effect of modules in the same device, and the modules that the cold air passes through first have better heat dissipation effect.

[0003] Regarding how to achieve parallel ventilation of modules on each layer inside the cabinet, "A Gas-Liquid Heat Dissipation Radar Electronic Equipment Cabinet" (Application No.: CN202010558622.1, Publication No.: CN111683505B) proposes a gas-liquid heat dissipation radar electronic equipment cabinet, which has multiple internal air dispersion duct components, and multiple air dispersion duct components are installed in parallel and at intervals in the installation cavity in the vertical direction. The air dispersion duct components are provided with a connected air inlet end and an air outlet end. The cold air in the cold air delivery channel can be divided and flowed into the air dispersion duct component under the dispersion effect and dispersed from the air outlet end into the heat installation cavity. Although this patent improves the heat dissipation effect of each layer of heating modules inside the cabinet and improves the heat dissipation efficiency through the design of parallel ventilation, it does not realize a method for controlling the temperature uniformity of each heating module. Summary of the invention

[0004] In order to address the deficiencies of current technology, the present invention proposes a module temperature control method for a cabinet, which selects axial flow fans with adjustable wind speeds, controls the rotation speed of each axial flow fan according to the weighted coefficient of the contribution of each axial flow fan to the module air volume according to the actual temperature distribution of each module, changes the module air volume distribution, and thereby achieves the purpose of temperature control.

[0005] To achieve the above object, the technical solution of the present invention is as follows:

[0006] Step 1: Set the influence factor ε of the axial fan on the module cooling air volume MijAij , air volume range of axial flow fan [Q LL , Q UL ]、Module tolerance temperature upper limit range [T LL , T UL ]、The maximum temperature difference ΔT allowed by the module UL , Axial fan air volume adjustment amplitude A m . Fan air volume range value [Q LL , Q UL]Reduce the fan air volume adjustment range, ensure the extreme value of the fan air volume, and improve the program operation efficiency.

[0007] Step 2: The cabinet is turned on and all axial flow fans operate at the initial working air volume.

[0008] Step 3: After the cabinet runs stably, collect the module temperature and obtain the difference ΔT between the highest and lowest values ​​of the module during operation, the highest module temperature Tmax, and the lowest module temperature Tmin.

[0009] Step 4: By determining the temperature distribution, adjust the air volume of the axial flow fan. If Tmax∈[TLL,TUL], ΔT≤ΔTUL, Tmin∈[TLL,TUL], or the air volume of all fans remains unchanged before and after adjustment, set the current air volume of all axial flow fans to the default value and the program ends. Otherwise, adjust the air volume of the axial flow fan and the program returns to step 3 until the program termination condition is met.

[0010] Furthermore, the influence factor ε of the axial flow fan on the module cooling air volume in step 1 is MijAij is obtained from experimental measurements, ε MijAij It reflects the impact of a single fan on the heat dissipation volume of a module.

[0011] Furthermore, in step 4, the air volume of the axial flow fan is adjusted as follows:

[0012] (1) When T max >T UL , T min >T UL When the system program determines that the current temperature of all modules is too high and exceeds the module tolerance temperature, the system determines that all axial flow fans will jump to the set amplitude A. m Increase the speed.

[0013] (2) When T max >T UL , T min ∈[T LL , T UL ], the system program can determine that the maximum temperature of the module exceeds the module tolerance temperature, and the system determines the influence factor ε of the axial flow fan on the module heat dissipation air volume according to the corresponding maximum temperature module MijAij , press A m ×ε MijAij Increase all fan speeds.

[0014] (3) When T max >T UL , T min <T LL When the system program determines the influence factor ε of the axial fan on the module cooling air volume according to the corresponding highest temperature moduleMijAij , press A m ×ε MijAij Increase all fan speeds.

[0015] (4) When T max ∈[T LL , T UL ], and ΔT>ΔTUL, the system program determines the influence factor ε of the axial flow fan on the module heat dissipation air volume according to the corresponding lowest temperature module MijAij , press A m ×ε MijAij Reduce all fan speeds.

[0016] (5) When T max ∈[T LL , T UL ], ΔT≤ΔTUL and T min <T LL When the system program determines the influence factor ε of the axial fan on the module cooling air volume according to the corresponding lowest temperature module MijAij , press A m ×ε MijAij Reduce all fan speeds.

[0017] (6) When T max <T LL When the system program determines that the temperature of all modules is low, the overall fan air volume is large, and the system determines that all axial fans are set to jump at the set amplitude A. m Reduce the speed.

[0018] Furthermore, the maximum temperature difference ΔTUL allowed for the module set in step 1 satisfies ΔT UL <T UL -T LL .

[0019] Beneficial effects of the present invention:

[0020] 1) The cabinet of the present invention adopts the form of parallel ventilation, and the heat dissipation efficiency of the cabinet is higher.

[0021] 2) The wind speed of the axial flow fan of the heat dissipation unit described in the present invention is adjustable. According to the actual temperature distribution of each module and the weighted coefficient of the contribution of each axial flow fan to the module air volume, the rotation speed of each axial flow fan can be controlled, the module air volume distribution can be changed, the purpose of module temperature control can be achieved, and the temperature uniformity of each module in the cabinet can be better. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Schematic diagram of the control principle of an embodiment of the present invention. DETAILED DESCRIPTION

[0023] The present invention proposes a method for controlling the module temperature of a cabinet. The present invention is further described in detail below in conjunction with the accompanying drawings and through specific embodiments. The following embodiments are only descriptive and not restrictive. The present invention can also be implemented in other ways different from those described herein, and the protection scope of the present invention cannot be limited by this.

[0024] The cold air inlets of the chassis inside the cabinet described in the embodiment of the present invention are independent of each other. The cold air blown out by the heat exchanger is blown to the front of the cabinet and the bottom of the lowest chassis. The fan at the tail of the heat dissipation unit on the top of the chassis extracts air. The cold air blown out by the heat exchanger passes through the module from the bottom of the chassis, thereby taking away the heat of the module. After heat exchange, the hot air is blown into the heat exchanger through the axial flow fan of the heat dissipation unit for heat exchange. The chassis are ventilated and dissipated in parallel, with high heat dissipation efficiency and more uniform module temperature distribution.

[0025] The axial flow fan speed of the heat dissipation unit described in the embodiment of the present invention is adjustable. When the temperature of a module in the chassis is too high, the fan speed of the heat dissipation unit corresponding to the module is increased through program control to increase the heat exchange of the module with too high temperature. At the same time, the fan speed of the heat dissipation unit corresponding to the module with relatively low temperature is reduced to reduce the heat exchange of the module.

[0026] According to the heat transfer formula:

[0027] P=δ*C p *ρ*Q*ΔT

[0028] Where: P is the heat dissipation power;

[0029] δ is the weighting coefficient;

[0030] Cp is the specific heat capacity of air;

[0031] ρ is the air density;

[0032] Q is the module cooling air volume;

[0033] ΔT is the average temperature difference between the module inlet and outlet;

[0034] Since the modules inside a single chassis share the same air inlet and outlet, the cooling air volume of a module is related to the air volume of the four axial flow fans inside the chassis. According to experimental measurements, for the cooling air volume of a single module, each axial flow fan is set with a group of influencing factors corresponding to the cooling air volume of the module. See the following table.

[0035] Table 1 Statistical table of factors affecting the cooling air volume of modules by axial flow fans

[0036] Module code <![CDATA[Fan A 11 > <![CDATA[Fan A 12 > … <![CDATA[Fan A ij > <![CDATA[M 11 ]]> <![CDATA[ε M11A11 ]]> <![CDATA[ε M11A12 ]]> … <![CDATA[ε M11Aij ]]> <![CDATA[M 12 ]]> <![CDATA[ε M12A11 ]]> <![CDATA[ε M12A12 ]]> … <![CDATA[ε M12Aij ]]> … … … … … Mij <![CDATA[ε MijA11 ]]> <![CDATA[ε MijA12 ]]> … <![CDATA[ε MijAij ]]>

[0037] In the entire cabinet system, the air volume of all axial fans is set to a reference value range [Q LL , Q UL], set the upper limit value range for the module tolerance temperature [T LL , T UL ], set the maximum allowable temperature difference ΔT for the module UL , generally ΔT UL <T UL -T LL , set the amplitude of each jump of the axial flow fan air volume A m .

[0038] When the cabinet is in operation, the initial operating air volume is set for the axial flow fan and the temperature control program is started.

[0039] 1. When the module operating temperature is stable, collect the temperature of all modules to obtain the difference between the highest and lowest temperatures ΔT and the highest module temperature T max , module minimum temperature T min .

[0040] 2. When T max ∈[T LL , T UL ], ΔT≤ΔTUL and T min ∈[T LL , T UL ] or if the air volume of all fans remains unchanged before and after adjustment, the judgment program is terminated and the obtained axial flow fan air volume gear is the optimal combination of the current system.

[0041] 3. Otherwise, adjust the fan air volume as follows:

[0042] 4. When T max >T UL , T min >T UL When the system program determines that the current temperature of all modules is too high and exceeds the module tolerance temperature, the system determines that all axial flow fans will jump to the set amplitude A. m Increase the speed.

[0043] (1) When T max >T UL , T min ∈[T LL , T UL ], the system program can determine that the maximum temperature of the module exceeds the module tolerance temperature, and the system determines the influence factor ε of the axial flow fan on the module heat dissipation air volume according to the corresponding maximum temperature module MijAij , press A m ×ε MijAij Increase all fan speeds.

[0044] (2) When T max >T UL , T min <TLL When the system program determines the influence factor ε of the axial fan on the module cooling air volume according to the corresponding highest temperature module MijAij , press A m ×ε MijAij Increase all fan speeds.

[0045] (3) When T max ∈[T LL , T UL ], and ΔT>ΔT UL When the system program determines the influence factor ε of the axial fan on the module cooling air volume according to the corresponding lowest temperature module MijAij , press A m ×ε MijAij Reduce all fan speeds.

[0046] (4) When T max ∈[T LL , T UL ], ΔT≤ΔT UL And T min <T LL When the system program determines the influence factor ε of the axial fan on the module cooling air volume according to the corresponding lowest temperature module MijAij , press A m ×ε MijAij Reduce all fan speeds.

[0047] (5) When T max <T LL When the system program determines that the temperature of all modules is low, the overall fan air volume is large, and the system determines that all axial fans are set to jump at the set amplitude A. m Reduce the speed.

[0048] When the fan air volume adjusted according to the above method exceeds the set range [Q LL , Q UL ], the fan air volume is determined according to the upper and lower limit values.

[0049] 5. If the air volume of all axial flow fans remains unchanged before and after adjustment, the determination procedure is terminated and the obtained air volume level of the axial flow fans is the optimal combination of the current system. Otherwise, repeat steps 1 to 4.

[0050] The axial flow fan air volume level obtained after optimization through the above program is used as the default value for all axial flow fans in the current system. When the system is restarted, the system axial flow fans operate at the default air volume level.

Claims

1. A method for controlling module temperature of a cabinet, characterized in that: Step 1: Set the influence factor ε of the axial fan on the module cooling air volume MijAij , air volume range of axial flow fan [Q LL , Q UL ]、Module tolerance temperature upper limit range [T LL , T UL ]、The maximum temperature difference ΔT allowed by the module UL , Axial fan air volume adjustment amplitude A m ; Step 2: The cabinet is turned on and all axial flow fans are operated at the initial working air volume; Step 3: After the cabinet runs stably, collect the module temperature and obtain the difference ΔT between the highest and lowest values ​​of the module during operation and the highest module temperature T max , module minimum temperature T min ; Step 4: By determining the temperature distribution, adjust the air volume of the axial flow fan; if T max ∈[T LL ,T UL ], ΔT≤ΔT UL , T min ∈[T LL ,T UL ], or the air volumes of all fans remain unchanged before and after adjustment, the air volumes of all current axial flow fans are set to the default values ​​and the program ends; otherwise, the air volumes of the axial flow fans are adjusted and the program returns to step 3 until the program termination conditions are met.

2. The method for controlling module temperature of a cabinet according to claim 1, characterized in that: The influence factor ε of the axial flow fan on the module heat dissipation air volume in step 1 MijAij It is obtained from experimental measurement.

3. The method for controlling module temperature of a cabinet according to claim 1, characterized in that: In step 4, the air volume of the axial flow fan is adjusted as follows: (1) When T max >T UL , T min >T UL When the system program determines that the current temperature of all modules is too high and exceeds the module tolerance temperature, the system determines that all axial flow fans will jump to the set amplitude A. m Increase the speed; (2) When T max >T UL , T min ∈[T LL , T UL ], the system program can determine that the maximum temperature of the module exceeds the module tolerance temperature, and the system determines the influence factor ε of the axial flow fan on the module heat dissipation air volume according to the corresponding maximum temperature module MijAij , press A m ×ε MijAij Increase the speed of all fans; (3) When T max >T UL , T min <T LL When the system program determines the influence factor ε of the axial fan on the module cooling air volume according to the corresponding highest temperature module MijAij , press A m ×ε MijAij Increase the speed of all fans; (4) When T max ∈[T LL , T UL ], and ΔT>ΔT UL When the system program determines the influence factor ε of the axial fan on the module cooling air volume according to the corresponding lowest temperature module MijAij , press A m ×ε MijAij Reduce the speed of all fans; (5) When T max ∈[T LL , T UL ], ΔT≤ΔT UL And T min <T LL When the system program determines the influence factor ε of the axial fan on the module cooling air volume according to the corresponding lowest temperature module MijAij , press A m ×ε MijAij Reduce the speed of all fans; (6) When T max <T LL When the system program determines that the temperature of all modules is low, the overall fan air volume is large, and the system determines that all axial fans are set to jump at the set amplitude A. m Reduce the speed.

4. The method for controlling module temperature of a cabinet according to claim 1, characterized in that: The maximum temperature difference ΔT set for the module in step 1 UL Satisfy ΔT UL <T UL -T LL .

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