WO2014040267A1 - 离心风机冰箱的风道设计方法 - Google Patents

离心风机冰箱的风道设计方法 Download PDF

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Publication number
WO2014040267A1
WO2014040267A1 PCT/CN2012/081387 CN2012081387W WO2014040267A1 WO 2014040267 A1 WO2014040267 A1 WO 2014040267A1 CN 2012081387 W CN2012081387 W CN 2012081387W WO 2014040267 A1 WO2014040267 A1 WO 2014040267A1
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Prior art keywords
refrigerator
air
centrifugal fan
air duct
speed
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PCT/CN2012/081387
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English (en)
French (fr)
Inventor
韩丽丽
王书科
杨大海
陈庆涛
李琴
Original Assignee
海信（北京）电器有限公司
海信容声(广东)冰箱有限公司
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Application filed by 海信（北京）电器有限公司, 海信容声(广东)冰箱有限公司 filed Critical 海信（北京）电器有限公司
Priority to PCT/CN2012/081387 priority Critical patent/WO2014040267A1/zh
Priority to CN201280001386.7A priority patent/CN104067073B/zh
Publication of WO2014040267A1 publication Critical patent/WO2014040267A1/zh

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/44—Fluid-guiding means, e.g. diffusers
    • F04D29/441—Fluid-guiding means, e.g. diffusers especially adapted for elastic fluid pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D17/00—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces
    • F25D17/04—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection
    • F25D17/06—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection by forced circulation
    • F25D17/062—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection by forced circulation in household refrigerators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D2317/00—Details or arrangements for circulating cooling fluids; Details or arrangements for circulating gas, e.g. air, within refrigerated spaces, not provided for in other groups of this subclass
    • F25D2317/06—Details or arrangements for circulating cooling fluids; Details or arrangements for circulating gas, e.g. air, within refrigerated spaces, not provided for in other groups of this subclass with forced air circulation
    • F25D2317/067—Details or arrangements for circulating cooling fluids; Details or arrangements for circulating gas, e.g. air, within refrigerated spaces, not provided for in other groups of this subclass with forced air circulation characterised by air ducts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D2317/00—Details or arrangements for circulating cooling fluids; Details or arrangements for circulating gas, e.g. air, within refrigerated spaces, not provided for in other groups of this subclass
    • F25D2317/06—Details or arrangements for circulating cooling fluids; Details or arrangements for circulating gas, e.g. air, within refrigerated spaces, not provided for in other groups of this subclass with forced air circulation
    • F25D2317/068—Details or arrangements for circulating cooling fluids; Details or arrangements for circulating gas, e.g. air, within refrigerated spaces, not provided for in other groups of this subclass with forced air circulation characterised by the fans
    • F25D2317/0683—Details or arrangements for circulating cooling fluids; Details or arrangements for circulating gas, e.g. air, within refrigerated spaces, not provided for in other groups of this subclass with forced air circulation characterised by the fans the fans not of the axial type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D2500/00—Problems to be solved
    • F25D2500/02—Geometry problems

Definitions

  • the invention relates to a method for designing a duct of a refrigerator, in particular to a method for designing a duct of a refrigerator using a centrifugal fan. Background technique
  • the air-cooled refrigerator distributes the air absorbing the evaporator cooling capacity to each compartment through the design of the air duct. Since the storage temperature of each compartment is closely related to the air volume distribution ratio of the room, and the air volume distribution of each compartment The situation is related to the matching of the working characteristics of the fan and the resistance characteristics of the air ducts in each room. Therefore, air-cooled refrigerators of different specifications and models have different fan types and air duct structures, and their fan characteristics and air duct resistance characteristics are also different.
  • the type of fan used in common air-cooled refrigerators is an axial fan.
  • the axial flow fan is characterized in that the fluid flows from the axial direction into the impeller and flows out in the axial direction, the flow rate is large, the lift (full pressure) is low, and the specific number of revolutions is large; the advantage is that the structure is simple and compact, the outer shape is small, and the weight is light;
  • the centrifugal fan is characterized by a high lift, the axial flow of the airflow into the rotating blade, and is thrown toward the edge of the impeller under centrifugal force, with a high pressure coefficient and a relatively low flow coefficient. Therefore, for some air-cooled refrigerators with complicated air duct structure and large air duct resistance, it is more suitable to use centrifugal fans than axial fans.
  • the air duct structure of the existing air-cooled refrigerator is mostly designed for the air supply characteristics of the axial flow fan. Since the air supply direction of the centrifugal fan is completely different from the air supply mode of the axial flow fan, if the existing air duct is used, the air volume required for the refrigerating compartment, the freezing compartment, and the variable greenhouse cannot be satisfied. Therefore, the air duct needs to be required for the type of the centrifugal fan. Designed to divert the flow of cold air in the refrigerator to achieve higher efficiency. Summary of the invention
  • the technical problem to be solved by the present invention is to provide a wind tunnel design method for a centrifugal fan refrigerator, and to determine the air passage structure by numerical calculation and CFD simulation steps for the technical specifications of the centrifugal fan. Relevant parameters, finally achieve reasonable distribution of air volume in each room of refrigeration, freezing and temperature change, uniform air flow field, energy saving and consumption reduction.
  • the technical solution adopted by the present invention is a method for designing a duct of a centrifugal fan refrigerator, which comprises the following steps:
  • Step one determine the refrigerator volume and room temperature: clarify the volume of each compartment of the refrigerator and the temperature required for each compartment of the refrigerator;
  • Step 2 calculate the air volume distribution ratio of each compartment of the refrigerator: According to the volume of each compartment of the refrigerator and the temperature required by each compartment of the refrigerator, Calculate the theoretical value of the air distribution ratio of each room;
  • Step 3 calculate the centrifugal fan speed triangle: absolute speed v , relative speed w and circumference when the centrifugal fan rotates
  • the speed "forms a centrifugal fan speed triangle, where the absolute speed ⁇ is equal to the vector sum of the relative speed w and the peripheral speed"
  • step four the simulation results in the air duct structure: the centrifugal fan speed triangle calculated in step three, as the air duct flow
  • the boundary conditions of the field analysis are calculated and corrected by the simulation software.
  • the circumferential surface of the centrifugal fan is equally divided into circular arc surfaces, and the calculated velocity vector is loaded onto the circular arc surface as an air inlet, and the like. Enter the tuyere of the refrigerator as an air outlet.
  • the fourth step of the air duct design method of the centrifugal fan refrigerator in the fourth step, when the simulation software is used for correction, it is judged whether the calculated air volume distribution ratio analog value at the exit of the air duct structure and the theoretical value of the air volume distribution ratio of each room satisfy the difference range. Within 5% of the staff.
  • the refrigerator air duct design method of the present invention is directed to a refrigerator that uses a centrifugal fan to supply air.
  • the theoretical air volume distribution ratio is determined according to the volume and temperature of each chamber of the refrigerator to provide a reasonable judgment standard for the air duct design;
  • the "centrifugal fan speed triangle" determined by the size of the impeller exit angle is analyzed and calculated, and the key technical parameters as the boundary condition of the airflow flow field analysis are obtained.
  • the simulation and simulation software is used to calculate and correct the air duct structure.
  • the idea is clear, easy to operate, and can be applied to the design and optimization of the air duct structure of the centrifugal fan of different specifications and models, so that the air volume distribution of each room of the refrigerator is reasonable, the flow field in the air duct is uniform, and the boot time is reduced, thereby achieving energy saving and consumption reduction. effect.
  • the refrigerator air duct design method of the present invention is calculated by using simulation software, the circumferential surface of the centrifugal fan is equally divided into circular arc surfaces, and the calculated velocity vector is loaded onto the circular arc surface as an air inlet, and the other air inlets entering the cold storage chamber are taken out as The tuyere; can accurately determine the air inlet and outlet according to the structure of the centrifugal fan and the characteristics of the air supply, so as to achieve reasonable distribution and control of the air volume.
  • the simulation software When the method for designing the air duct of the refrigerator of the present invention is modified by the simulation software, it is judged whether the simulated value of the air volume distribution ratio at the exit of the air duct structure obtained by the solution and the theoretical value of the air volume distribution ratio of each chamber satisfy the difference range within 5%; It can maximize the simulation value of the air duct design close to the theoretical value, and ensure that the air duct structure designed and produced according to the simulation value can better guide the wind direction and achieve better cooling effect when the refrigerator is working normally.
  • Figure 1 is a schematic view of the speed triangle of the centrifugal fan of the present invention.
  • Figure 2 is a vector diagram of the refrigerating compartment speed of the initial airflow field in the embodiment
  • Figure 3 is a vector diagram of the variable greenhouse velocity of the initial airflow field in the embodiment
  • Figure 4 is a vector diagram of the freezer compartment velocity of the initial airflow field in the embodiment
  • Figure 5 is a structural view of the air separation portion of the modified air duct centrifugal fan in the embodiment
  • Figure 6 is a front view of the modified air passage in the embodiment.
  • Fig. 7 is a rear view of the modified air passage in the embodiment. detailed description
  • a refrigerator using a centrifugal fan is taken as an example, and the air passage design method includes the following steps:
  • Step 1 Determine the volume and room temperature of the refrigerator: Determine the volume of each chamber of the refrigerator and the temperature required for each room of the refrigerator; the sizes of the refrigerator, the greenhouse, and the freezer are 152L, 35L, and 74L respectively; the required temperatures are: 4 ° C, _6 ° C, _ 18 ° C.
  • the ratio of the air volume distribution of the refrigerators is calculated according to the volume of each of the refrigerators and the temperature of each of the refrigerators, and the theoretical distribution of the air volume distribution ratio of the refrigerator, the freezer, and the greenhouse is 19.4%. : 66. 7%: 13.9%.
  • Step 3 Calculate the centrifugal fan speed triangle: The absolute speed v , the relative speed w and the peripheral speed of the centrifugal fan rotate to form a centrifugal fan speed triangle, as shown in Fig. 1, where the absolute speed V is equal to the relative speed w and the peripheral speed.
  • the airflow of the entire air duct is 994.4. It can be seen from the data in Table 2 that the simulated air distribution ratio of the refrigerator, the greenhouse and the freezer is 19.5% 16. 4% 64. 1%; The theoretical distribution of the air volume distribution ratio of the chamber, the greenhouse, and the freezer is 19. 4%: 13.9% 66. 7%; thus, the data difference in Table 2 is within ⁇ 5%, meeting the design requirements. ;
  • the above is only the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any person skilled in the art may use the above-disclosed technical contents to change or modify the equivalent equivalent. Example. However, any simple modifications, equivalent changes and modifications made to the above embodiments in accordance with the technical spirit of the present invention are still within the scope of the present invention.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Cold Air Circulating Systems And Constructional Details In Refrigerators (AREA)

Abstract

提供了一种离心风机冰箱的风道设计方法。首先，根据冰箱各室的容积与温度确定理论风量分配比例，然后根据离心风机转速、叶轮出口角所确定的"离心风机速度三角形"进行分析计算，得出作为风道流场分析的边界条件的关键技术参数，最后利用仿真模拟软件计算并修正得到风道结构。根据该设计方法设计出来的风道不仅能够合理分配冰箱各室风量，还能最大程度地使得风道设计的模拟值接近理论值。

Description

心风机冰箱的风道设计方法 技术领域
本发明涉及一种冰箱风道设计方法， 具体是指采用离心风机的冰箱风道设计方法。 背景技术
风冷冰箱是通过风道的设计将吸收蒸发器制冷量的空气分配到各个间室， 由于各间室的 储藏温度与该室的风量分配比例有着密切的关系， 而且， 各间室的风量分配情况又与风机工 作特性与各间室风道阻力特性的匹配情况有关。 因此， 不同规格、 不同型号的风冷电冰箱， 其风机形式和风道结构均不相同， 其风机特性及风道阻力特性也不相同。
目前， 常见风冷冰箱所使用的风机类型为轴流风机。 轴流风机的特点是流体从轴向流入 叶轮并沿轴向流出， 流量大， 扬程 (全压)低， 比转数大； 其优点是结构简单、 紧凑， 外形尺 寸小， 重量较轻； 而离心风机的特点是扬程较高， 气流轴向流入旋转叶道， 在离心力作用下 被抛向叶轮边缘， 具有较高的压力系数与相对较低的流量系数。 因此， 对于一些风道结构复 杂、 风道阻力较大的风冷冰箱， 采用离心风机比轴流风机更为适合。
现有风冷冰箱的风道结构多是针对轴流风机送风特点进行设计的。 由于离心风机送风方 向与轴流风机的送风模式完全不同， 如果采用现有风道则无法满足冷藏室、 冷冻室、 变温室 所需风量， 因此， 需要针对离心风机的类型要求进行风道设计， 在冰箱内对冷风的流向进行 疏导， 使其达到更高的工作效率。 发明内容
针对现有技术存在的不足， 本发明需要解决的技术问题是， 提供一种离心风机冰箱的风 道设计方法， 针对离心风机的技术指标， 通过数值计算及 CFD仿真等步骤， 确定风道结构的 相关参数， 最终达到冷藏、 冷冻、 变温各室风量分配合理， 风道流场均匀， 节能降耗的效果。
为解决上述技术问题， 本发明所采取的技术方案是，一种离心风机冰箱的风道设计方法， 包括以下步骤：
步骤一， 确定冰箱容积与室温： 明确冰箱各室容积与冰箱各室所需达到的温度； 步骤二， 计算冰箱各室风量分配比例： 根据冰箱各室容积与冰箱各室所需达到的温度， 计算出各室风量分配比例理论值；
步骤三， 计算离心风机速度三角形： 离心风机旋转时的绝对速度 v、 相对速度 w与圆周 速度"形成离心风机速度三角形， 其中， 绝对速度^等于相对速度 w和圆周速度"的矢量和； 步骤四， 模拟得出风道结构： 将步骤三计算出的离心风机速度三角形， 作为风道流场分 析的边界条件，利用仿真模拟软件进行计算并修正得到风道结构。
上述的离心风机冰箱的风道设计方法， 步骤四中， 利用仿真模拟软件计算时， 将离心风 机圆周面等分成圆弧面， 把计算出的速度矢量加载到圆弧面上作为进风口， 其他进入冷藏室 的风口作为出风口。
上述离心风机冰箱的风道设计方法， 步骤四中， 利用仿真模拟软件修正时， 判断求解得 出的风道结构出口处风量分配比例模拟值与各室风量分配比例理论值是否满足差值范围在士 5%之内。
本发明具有如下优点及有益技术效果：
本发明的冰箱风道设计方法针对使用离心风机进行送风的冰箱， 首先， 根据冰箱各室的 容积与温度确定理论风量分配比例， 为风道设计提供合理的判断标准； 然后根据离心风机转 速、 叶轮出口角的大小所确定的 "离心风机速度三角形"进行分析计算， 得出作为风道流场 分析边界条件的关键技术参数； 最后， 利用仿真模拟软件进行计算并修正得到风道结构； 本 发明思路清晰、 便于操作、 而且能够适用于不同规格、 型号的离心风机冰箱风道结构的设计 与优化， 使冰箱各室风量分配合理， 风道内流场均匀， 从而开机时间减少， 达到节能降耗的 效果。
本发明的冰箱风道设计方法利用仿真模拟软件计算时，将离心风机圆周面等分成圆弧面， 把计算出的速度矢量加载到圆弧面上作为进风口， 其他进入冷藏室的风口作为出风口； 能够 更加准确的根据离心风机的结构与送风特点， 确定进风口与出风口， 从而达到风量的合理分 配与控制。
本发明的冰箱风道设计方法利用仿真模拟软件修正时， 判断求解得出的风道结构出口处 风量分配比例模拟值与各室风量分配比例理论值是否满足差值范围在士 5%之内； 能够最大程 度的使得风道设计的模拟值接近理论值， 保证根据模拟值设计生产的风道结构在冰箱正常工 作时， 能够更好的引导风向， 取得更好的制冷效果。 附图说明
图 1是本发明的离心风机速度三角形示意图；
图 2是实施例中初始风道流场的冷藏室速度矢量图;
图 3是实施例中初始风道流场的变温室速度矢量图; 图 4是实施例中初始风道流场的冷冻室速度矢量图；
图 5是实施例中修正风道离心风机分风处结构图；
图 6是实施例中修正风道正视图；
图 7是实施例中修正风道后视图。 具体实施方式
本实施例以采用离心风机的冰箱为例， 其风道设计方法， 包括以下步骤：
步骤一， 确定冰箱容积与室温： 明确冰箱各室容积与冰箱各室所需达到的温度； 冷藏室、 变温室、 冷冻室的大小分别为 152L、 35L、 74L; 所需达到的温度分别为： 4°C、 _6°C、 _18°C。
步骤二， 计算冰箱各室风量分配比例： 根据冰箱各室容积与冰箱各室所需达到的温度， 利用 EES软件计算出冷藏室、冷冻室、变温室的风量分配比例理论值为 19. 4%： 66. 7%： 13. 9%。
步骤三， 计算离心风机速度三角形： 离心风机旋转时的绝对速度 v、 相对速度 w与圆周 速度"形成离心风机速度三角形， 如图 1所示， 其中， 绝对速度 V等于相对速度 w和圆周速度 "的矢量和， 由此计算出 v =5. 844 [m/s]， ^ =Ί. 553 [m/s] , " =11. 723 [m/s]。
步骤四，模拟得出风道结构：将步骤三计算出的离心风机速度三角形，即： v =5. 844 [m/s] , w =7. 553 [m/s]， « =11. 723 [m/s] , 作为风道流场分析的边界条件,利用仿真模拟软件计算并 修正， 包括如下步骤：
( 1 ) 空气体模型导入分析： 将生成的空气体模型导入仿真模拟软件中， 进行诊断扫描， 并进行模型处理， 将处理好的模型进行网格划分， 自动生成网格， 网格数量为 100万网格左 右； 然后， 设置材料属性， 并在 "流体" 中需设置变化方式。
( 2 ) 确定进风口与出风口： 将离心风机圆周面均匀分成 18份圆弧面， 将计算出的速度 矢量加载到圆弧面上作为进风口， 其他进入冷藏室的风口作为出风口。
( 3 ) 选择参数求解： 自动强制对流模式下， 重力方向为 （0， 0， -1 )， 采用湍流模型进 行非定常流动求解得出风道结构， 如图 2-4所示； 同时得出的风道结构各出口处风量如表 1 所示：
表 1 初始设计风道结构各出口处风量
Figure imgf000004_0001
4 32.6 9 6.8
5 45.8 17.7%
变温室 L/min 该室总风量
1 21.6 3 21.2 86.4
2 22.4 4 21.2 9.2%
冷冻室 L/min 该室总风量
1 109.1 4 106.2
683.8
2 131.5 5 104.8
3 106.9 6 125.3 73.1%
整个风道出风风量 935.7
由表 1中的数据可以看出，冷藏室、变温室、冷冻室风量分配比例模拟值为 17. 7%： 9. 2%： 73. 1%。
(4)误差判断： 判断求解得出的风道结构出口处风量分配比例模拟值与各室风量分配比 例理论值是否满足差值范围在 ± 5%之内， 若不满足则进行修正处理； 上述步骤二中的冷藏室、 变温室、 冷冻室的风量分配比例理论值为 19. 4%: 13. 9%： 66. 7%； 由此可知， 表 1中的数据 差值范围超出 ± 5%， 冷藏室与变温室风量较小， 需要进行修正处理。
( 5 )修正处理： 观察速度矢量图， 对局部产生涡流的对应风道结构， 如图 3所示， 变温 室风道内存在涡流， 需要进行修改， 修改后重复上述步骤 （1 ) - ( 4)， 得到的风道结构各出 口处风量如表 2所示：
表 2 修正后设计风道结构各出口处风量
Figure imgf000005_0001
105.2 100.3
637.1
125.7 98.4
111.2 6 95.3 64.1%
整个风道出风风 994.4 由表 2中的数据可以看出，冷藏室、变温室、冷冻室风量分配比例模拟值为 19. 5% 16. 4% 64. 1%； 上述步骤二中的冷藏室、 变温室、 冷冻室的风量分配比例理论值为 19. 4%: 13. 9% 66. 7%； 由此可知， 表 2中的数据差值范围在 ± 5%之内， 满足设计要求；
此时， 冰箱风道离心风机分风处的结构， 如图 5所示， 其中 ¾=75 ° ¾=65 ° a3=110 ° a4=110 ° ， 离心风机外径到分风处的距离 b=5 ± 1 (考虑到结构件变形及制造误差）， 风道的连接曲线为三阶贝塞尔曲线， 如图 7与图 8所示， 此为合理的风道结构。 以上所述， 仅是对本发明的较佳实施例而已， 并非是对本发明做其他形式的限制， 任何 熟悉本专业的技术人员可能利用上述揭示的技术内容加以变更或改型为等同变化的等效实施 例。 但是， 凡是未脱离本发明方案内容， 依据本发明的技术实质对以上实施例所做的任何简 单修改、 等同变化与改型， 仍属于本发明的保护范围。

Claims

权 利 要 求 书 — WO 2014/040267 PCT/CN2012/081387
1、 一种离心风机冰箱的风道设计方法， 其特征在于： 包括以下步骤：
步骤一， 确定冰箱容积与室温： 明确冰箱各室容积与冰箱各室所需达到的温度； 步骤二， 计算冰箱各室风量分配比例： 根据冰箱各室容积与冰箱各室所需达到的温度， 计算出各室风量分配比例理论值；
步骤三， 计算离心风机速度三角形： 离心风机旋转时的绝对速度 V、 相对速度 W与圆周 速度"形成离心风机速度三角形， 其中， 绝对速度 V等于相对速度 W和圆周速度"的矢量和； 步骤四， 模拟得出风道结构： 将步骤三计算出的离心风机速度三角形， 作为风道流场分 析的边界条件，利用仿真模拟软件进行计算并修正得到风道结构。
2、 根据权利要求 1所述的离心风机冰箱的风道设计方法， 其特征在于： 步骤四中， 利用 仿真模拟软件计算时， 把离心风机圆周面等分成圆弧面， 将计算出的速度矢量加载到圆弧面 上作为进风口， 其他进入冷藏室的风口作为出风口。
3、 根据权利要求 1所述的离心风机冰箱的风道设计方法， 其特征在于： 步骤四中， 利用 仿真模拟软件修正时， 判断求解得出的风道结构出口处风量分配比例模拟值与各室风量分配 比例理论值是否满足差值范围在士 5%之内。
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