Tensile testing machine series
tensile testing machine
Cupping universal
electro-hydraulic servo
Electronic universal tensile testing machine series
Liquid crystal display
Microcomputer control
Hydraulic universal testing machine series
Microcomputer controlled
Microcomputer screen display type
Digital display type
WE-B type cylinder type
Type WEW-D six column
WAW-C worm electro-hydraulic servo
Impact testing machine series
Pendulum type impact
The impact specimen notch broaching
Impact specimen low temperature tank
Impact specimen notch projector
pendulum type impact
Torsion testing machine series
Material machine
Wire torsion testing machine
NDS series digital display
metal wire
wire winding tester
NDW series microcomputer control material
Spring testing machine series
Manual double digital display
Full automatic
Computer controlled
Spring torsion
Spring fatigue
Gas
Pressure testing machine series
Digital pressure
Automatic pressure
Manhole cover pressure
microcomputer control constant
electro hydraulic
liquid crystal display type
Steel strand testing machine
Computer screen display
Computer controlled
vertical (horizontal) steel strand relaxation
electro hydraulic servo
screen display steel strand
Ring steel test machine
Microcomputer control
Liquid crystal display
liquid crystal display
microcomputer control
artificial board
Artificial board universal
manual artificial board
artificial board scratch
rolling wear
artificial board universal
falling ball impact
Test machine parts
Electronic extensometer
DX-400 manual management
Test machine parts -1
Test machine parts -2
Test machine parts -3
Bending test machine
reinforcing steel bar
Steel tube
Wire
pipe bending
reinforced bar
double reinforced
Hardness tester series
HR-150A's
HB-3000B's
HV-1000 micro
FY310 portable
LX-A portable shore
HLN-11A
Metallographic examination equipment
Metallurgical microscope
Metallographic polishing
Metallographic mosaic
Metallographic cutting

低温冲击试验机复叠式制冷循环说明


  冲击试验机两系统之间采用一个冷凝蒸发器衔接起来,高温级的中温制冷剂在其中蒸发制冷,使低温级的低温制冷剂在其中放出热量,与蒸发的中温制冷剂进行热交换后,被冷凝成为液体。
  复叠式制冷装置是使用两种或两种以上的制冷剂,由两个或两个以上的单级压缩制冷循环组成的低温制冷机,一般用于获取-60℃~-120℃的低温。
  常用的两级复叠制冷装置,由高温级和低温级两部分组成。高温级中使用中温制冷剂,低温级中使用低温制冷剂,形成两个单级压缩制冷系统复叠工作的循环。
  从冷凝蒸发器出来的中温制冷剂蒸气带走低温制冷剂的冷凝热量,经过高温级循环将热量传递给环境介质(水或空气)。而从万能试验机冷凝蒸发器出来的低温制冷剂液体,经低温级节流阀降压后,进入蒸发器吸取被冷却物的热量而蒸发制冷,获得所需要的低温。

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