1. Condensate pump regeneration 1.1 Regeneration time ①According to the operation cycle, regular regeneration. ② cooling capacity is reduced (less than 20K temperature less; degree of vacuum), for regeneration. 1.2 regeneration type ①usually regeneration: 3 ~ 8h. ② rapid regeneration: When the pump contains toxic, corrosive, flammable gases and a lot of O2 water, the pump stopped, a short period of regeneration. 1.3 The implementation of rapid regeneration ①Close the high valve, N2 or N2 at room temperature N2 gas introduced into the pump chamber Purge Gas port, the diluted toxic gases will be released through the exhaust valve. At this time, if the temperature of the cold plate is less than 77K, the pressure in the pump chamber will not increase and the gas will not be released and will be condensed on the cold head. When flushing with N2, it is best to use a dedicated deflation pipe to exhaust N2 gas. When it is unavoidable to release from the safety valve, it is necessary to clean the safety valve due to a vacuum leak. ② heating with a blanket heating. But be careful when heating, the temperature can not exceed 70 ℃. Otherwise, the condensate pump will be damaged. 2. condensate pump check ①freezer operation is stable. ② whether the motor rotation clockwise. ③ temperature, vacuum is normal. ④ outside the pump if there is condensation, or need to be regenerated. ⑤ H2 vapor pressure thermometer at room temperature (ie exposed to the atmosphere) value is between 4.7 ~ 5.7K. Otherwise, there may be a problem with the thermometer. 3. compressor check ①He pressure, water flow, water temperature, oil level is normal. ② compressor is operating normally. 4. Troubleshooting 4.1 The vacuum may cause the problem. ①vacuum safety valve leaked. ② cold plate is not installed properly, deterioration, poor regeneration. ③ pre-pump exhaust time is too long, so that the oil returned to the vacuum chamber and then be adsorbed to the cold plate. ④ refrigeration temperature of less than 20K the following: a1 freezer refrigeration capacity degradation; b1 compressor compression ability to reduce (rarely happen); c1He gas pressure is too low; d1He gas filling pressure is too high. ⑤ If it still does not work, it may be a deviation of the freezer phase angle. In this case, follow the steps below to make the adjustment again (refer to Fig. 4): a1 First, place the piston rod in the top dead zone ê (the highest point of the eccentric); b1 Then rotate the eccentric counterclockwise by 30 ° é), the low pressure valve is closed, and the high pressure valve is in the closed / open critical state. At this time, the arm stem is in a floating state, that is, there is no contact with the spool. Hand into the window of the mirror hole to rotate two large bearings, should feel very light; c1 if still feel heavy, you can twist off the two side of the plug by adjusting the arm stem adjustment screw to be amended. The low pressure valve is closed and the high pressure valve is closed. Open the critical condition (the high pressure valve on the side close to the high pressure pipe, ie the second boom). 4.2 Cryogenic pump malfunction may be the reason, ①motor is not running (the temperature is still room temperature). a1 power from the compressor without electricity; b1 poor mechanical performance (crankshaft distorted or short, bearing damage), especially the old model pump; c1 impurities into the motor, stuck motor; d1 moisture into the expansion chamber, the piston Rod expansion stuck; e1 plus heater rapid regeneration temperature exceeds 70 ℃, the piston rod expansion stuck (of course, the temperature returned to normal, the fault will disappear). ② abnormal motor operation. a1 The power supply voltage from the compressor is unstable; b1 water enters the pump (a few minutes there will be abnormal sound); Treatment: decomposition of the condensate pump; c1 air into the pump (when the temperature reached 20K only when the sound abnormalities); treatment Replace with He gas. Note: Before replacing, cut off the power and then disconnect the high-pressure pipe (for a compressor with more than one condensate pump). In the condensing pump to restore normal temperature process, pay attention to pressure changes, if the pressure exceeds 250Pa, it is necessary to step-down, it has been maintained at 250Pa, but not too low. d1 poor mechanical properties (freezer life has come). ③He leak may be the reason: a1 self-sealing joint seal is not good (the most common), available Snoop liquid leak; b1 compressor, connecting hose, condensate pump leak. Inspection methods: a1 to confirm the entire system leakage, for example, hourly, daily leak rate. And then the compressor and condensate pump separately, look at the compressor is how much leakage, and then compared with the entire system leak rate, which part of the leak to confirm; bl blister or Snoop liquid to check whether the hose leaks; c1 if the former Two check no problem, it is condensate pump leak. 5. Condensate pump exchange ①First, let the pump return to normal temperature. ② exhaust gas, in the process of pumping the former stage with N2 gas flushing. ③ In the condensate pump connected with the atmosphere, disconnect the compressor and condensate pump connected electrical, gas connector. Note: a1 remember He high, low pressure tube mutual position. b1 In the case of compressor operation change pump, you must first off after the high-pressure off low pressure. Otherwise, the high pressure can not be quickly released, the motor power will automatically cut off, and the vacuum safety valve open. ④ demolition, change the pump. NOTE: In condensate pumps used in equipment with R1F power supply, the sealing rings in the interface flanges typically do not use vacuum grease. Otherwise, easy to burn burning ring, causing air leaks. ⑤ reconnect the condensate pump electrical, gas fittings. Note: a1 first low-pressure side connector, and then even the high-pressure side connector. b1 try not to remove the hose side of the compressor connector. In order to avoid mixing high and low pressure pipes, the impurities deposited in the low pressure pipe run to the freezer through the high pressure joint (because the low pressure pipe is the last ring in the whole big cycle where impurities are easily deposited). c1 can not put the compressor out of the high-pressure ö intake connector wrongly connected to the low-pressure ö condensate pump outlet. Otherwise, do not cool. Even, will damage the condensate pump. 6. The exchange of activated carbon adsorber compressor should be regularly replaced, and after the change should pay attention to check He pressure, and timely leak detection. 7. Charge He gas (Purity: 99.999; Pressure: 18kg / cm2) When charging He gas, hand-held He tube should be self-flushing (one by one for 5 times). And, when tightening the connector, can not be tightened at once, you should slowly screw to thoroughly clean the air inside the connector. Note: If the compressor He gas leakage, the compressor should be the first vacuum (with 2.5Lös vacuum pump), then charge He gas.
Fine Chemicals Co., Ltd. , http://www.js-animalnutrition.com