2013增压透平膨胀机毕业设计翻译

增压透平膨胀机

Pressurization turbine expander

增压透平膨胀机是利用膨胀机的输出功来直接将入膨胀机前的气体增压，使得入膨胀机的膨胀气体压力升高，从而达到提高膨胀机前后压差，增加单位膨胀工质的产冷量，降低膨胀量的目的，减少膨胀量就意味着减少了循环压缩功，节约了能耗，并且还避免了机械能转变成电能而导致的损失，提高了膨胀功的回收效率，可以说它比过去常采用的电机或风机作为膨胀机的制动设备更完善。

Pressurization turbine expander expander has been used before the output of the power to directly into the expander gas pressurization, makes into the expansion of the expander gas pressure, so as to improve the pressure difference before and after the expander, increase unit expansion of the refrigerating effect, reduce the expansion amount decrease inflation means that reduces the cycle compression work, save energy consumption, and also to avoid the loss of mechanical energy into electrical energy and result in improved the expansion of the recovery efficiency of work, it is often used in motor or fan as expander braking equipment more perfect.

透平膨胀机是通过将来自上游的高压气流膨胀机为低压气流，连续不断的转化为机械能。高速气流使叶轮旋转，再通过由轴承支撑的转轴将机械能传递给压缩机、发电机，也可用油制动、风机制动消耗。

Turboexpander is a machine,which continuously converts kinetic energy into mechanical energy.This is done expending the high pressure gas from upstream to a lower pressure downstream through the expander.The high pressure gas causes the radial expander to rotate .Rotation is transmitted to the shaft,which is supported by a set of bearings.The power transmitted to the shaft can be used to drive a compressor,drive an electrical generator or can be dissipated through an oil brake

or air brake.

The spare parts of the turbine expander

透平膨胀机的零件

Bearings 轴承

ACD uses hydrodynamic bearing with tilt pad journal design and tilt pad thrust faces for most compressor loaded designs.All pads are babbitted with a tin/lead material

to increase durability and increase life.These bearings provide rotor dampening

throughout the operating range,which provides optimum reliability of the rotor dynamics.Each bearings has an imbedded RTD in the thrust face of two pads to monitor bearing temperature;one RTD is for primary use while the second is used as a backup. 在大多数带压缩机负载的设计中,ACD使用内孔和止推面均为可倾瓦的流动动力轴承.所有瓦块镶有锡合金以增加耐久力,延长寿命.这些轴承在整个运行过程中给转子提供缓冲,使转

子动力性能最佳.每个轴承均带有双支(一用一备)嵌入式热敏电阻用来检测轴承温度. Shaft 轴

Each shaft is made from a solid wrought bar and heat theated to assure mechanical properties at operating conditions.Each bearing journal and thrust face is dense hard chrome plate to reduce wire wooling,and therefore increased life.The wheal attachment at each shaft end is tapered to guarantee accurate alignment of the wheel for balance repeatability.The torque is transmitted through the shaft via tangs the speed pickup.Each shaft has two ground surfaces that are used to monitor the vibration.These arease are checked at final assure that the maximum mechanical and electrical runout is within 0.00025 inches.This allows use of four vibration probes during test and operation.A key phasor slot can be added to four vibration probes during test and operation.A key phasor slot can be added to the shaft at each end for the shaft seals.These hardened teeth run in close proximity to the soft babbitted seal runners.

每根转子轴都有锻件经热处理精制而成,以确保运行所需机械性能.轴承轴颈和止推面均镀以硬铬以增加硬度,延长使用寿命.轴端安装叶轮的锥面确保叶轮精确配合后保持动平衡.转矩由轴端的柄脚传递.轴上有二个相距180°方位的浅凹槽用来测量转动.另外,轴上有两段测振面,在最后组装时经仔细检查,以确保径向跳动在0.00025英寸以内.在性能测试和运行时,最多可使用四个振动探头.可以选择加装相位跟踪来测量角位移.在轴二端的轴封位置加

工成梳齿状迷宫密封槽,这些硬齿在设备运行时与巴氏合金密封环紧密贴合.

Expander and Compressor wheels

膨胀机、增压机叶轮

Both the expander and compressor wheel are manufactured from a solid