When we use the constant temperature and humidity test chamber, we will encounter the problem of not cooling, but what should we do when we encounter these problems? The reason why the constant temperature and humidity incubator does not cool
1. Since the constant temperature and humidity incubator is unable to maintain the temperature, it is observed whether the refrigeration compressor can be started during the operation of the test box. The compressor can be started during the operation of the environmental test equipment, indicating that the main power supply to each compressor The electrical wiring is normal and there are no problems with the electrical system.
2. There is no problem with the electrical system and continue to check the refrigeration system. First of all, it is checked that the exhaust and suction pressures of the low-temperature (R23) compressors of the two sets of refrigeration units are lower than the normal values, and the suction pressure is in an empty state, which indicates that the amount of refrigerant in the main refrigeration units is insufficient.
3. Touch the exhaust and suction piping of the R23 compressor of the main unit and find that the temperature of the exhaust pipe is not high and the temperature of the suction pipe is not low (unfrosted). This also explains the host group. The lack of R23 refrigerant.
The constant temperature and humidity incubator did not determine the cause of the failure and combined with the control process of the test chamber to further confirm the cause of the failure. The chamber had two sets of refrigeration units. One is the main unit and the other is the auxiliary unit. When the cooling rate is relatively high, the two units work at the same time. In the initial stage of the temperature maintenance period, the two units still work simultaneously. When the temperature is initially stabilized, the auxiliary unit stops working and the host group maintains the temperature stability. If the host group R23 is leaked, the cooling effect of the host group will be small. Since the two units work at the same time during the cooling process, there is no phenomenon that the temperature cannot be stabilized, and the indicated cooling rate decreases. In the temperature maintenance phase, once the auxiliary unit stops working, the main unit has no cooling effect, and the air in the test chamber will slowly rise. When the temperature rises to a certain extent, the control system will start the auxiliary unit to cool down the temperature and set the temperature down. In the vicinity of the fixed value (-55°C), the auxiliary unit stops working again. If so, the fault phenomenon shown in Figure 3 will appear.
At this point, it was confirmed that the cause of the production failure was the leakage of refrigerant R23 of the low-temperature (R23)-class unit of the host group. The leakage of the refrigeration system was checked and checked by a combination of leak detector and soapy water. It was found that the valve stem of a hot gas bypass solenoid valve cracked approximately 1 cm. Replace the solenoid valve to recharge the system and the system is operating normally. As can be seen from the above, the analysis and judgment of this fault phenomenon is basically easy to difficult, first "outside" after "inside", first "electrical" after "cooling" context to analyze and judge, familiar with and Understanding the principle and working process of the test chamber is the basis for analyzing failures to determine faults.
Hydraulic Pump Parts ,hydraulic main pumps parts are used widely in machinery field .Our main hydraulic pumps parts brand is for Kawasaki hydraulic pumps ,rexroth hydraulic pumps ,Nachi hydraulic pumps are used for excavators: Komatsu ,Hitachi ,Hyundai ,Kobelco,Summitomo...
We have follows model hydraulic pumps:
For Volvo Excavator hydraulic main pump parts:
EC240B ,EC360BLC,EC75,EC110,EC120,EC160,EC320B,EC210,EC280,EC290B,EC330,EC420,EC240BLC
For Komatsu excavator main hydraulic pump parts:
PC20,PC25,PC18,PC30,PC40,PC55,PC50UR,PC60,PC75,PC78,PC90,PC100,PC110,PC120,PC130-6,PC140,PC150-5,PC160,PC180,PC200-6,PC220,PC210,PC230,PC240,PC260,PC280,PC300,PC320,PC360,PC380,PC400,PC420,PC450-7
For Kobelco excavator main pump, Kobelco Hydraulic Pump parts:
,SK30,SK45,SK80,SK50,SK120,SK60,SK75UR,SK07,SK09,SK100,SK210,SK220,SK380,SK310,SK450,SK230,SK260,SK280 ,SK250,SK07-N2,SK320,SK330,SK360
For Hyundai excavator hydraulic main pump,Hyundai hydraulic pump parts: R55,R60,R75,R110,R130,R210LC-7,R215,R220LC-5,R225,R290,R300,R305,R360LC,R362,R375,R330LC,R450LC-6
For Hitachi excavator hydraulic main pump parts: EX25,EX30UR-2,EX35,EX40,EX45UU,EX50,EX60,EX75,EX90,EX100,EX55,EX120,EX160-1,EX200-2,EX210-5,EX220-6,EX270 UH07-7O/N,UH55,EX330,EX320-3 EX360,EX400,ZAXIS55,ZAXIS60,ZAXIS90, ZAXIS70,ZAXIS100-1,ZAXIS110-2,ZXXIS120,ZAXIS160,ZAXIS200-1, ZAXIS210 ZAXIS230 ZAXIS230-5 ZAXIS240 ZAXIS330 ZAXIS360 ZAXIS450
FOR SUMITOMO excavator main pump, sumitomo hydraulic pump parts: SH55,SH60,SH75,SH90,SH100,SH120-1/2/3/5,SH160,SH180,SH200-1/A3 SH220SH300-2 LS2650FJ-2 LS2800CJ/DJ/EJ/FJ-2 LS2800FJ2 LS2800F2 LS3400EA LS3400FJ LS5800FJ
Rexroth Hydraulic Pump parts models: A10VO,A11VO,A4VO,A4VG,A2FM,A2FO,A8VO,A7VO,A6VM...
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