1 Symptom: The pumping capacity of the pump is not enough; (1) the speed of the vacuum pump is not enough; (2) the seal is not tight, and there is a leak at the junction of the intake pipe or the shaft seal; (3) The outer circumference of the rotor and the pump housing, the gap between the rotor end surface and the end cap circumference is too large, and the gas return flow rate increases; (4) The ambient temperature or cooling water temperature is too high.
Method of exclusion:
(1) If the pump speed is not enough, and the amount of pumping is proportional to the pump speed, pump pumping capacity will decline. There are two cases; one is the pump speed is not equipped, that is, the diameter of the pulley is not suitable, you can change the pulley, change the diameter of the pulley; the other may be improper belt installation, not tension, belt slip And reduce the speed, which can adjust the motor position, the belt stretched to a certain tightness.
(2) to find out where leaks, if the connection flange leaks, it may be due to loosening of the connection screw, washer crushing deterioration or flange surface uneven; so at the shaft seal at the leak, it may be Sealed cup is not installed or broken, then replace the cup and install positive; if the packing seal, can be pulled into the filler out, replace the new, but the filler interface must be lap and overlap each other , The interface of the first lap must be staggered with the lap of the second lap and can not be in the same position.
(3) If the gap between the rotor and the rotor profile is not uniform, the gap is large at the circling and the other one is small. This is because the meshing condition of the synchronizing gear is not well adjusted during assembly, The gear wheel is fixed on the hub, and the hub of the other gear is made to be adjustable, because the two rotors have a conjugate surface and are normally meshed with each other. At the same time, the outer end of the transmission gear (synchronous gear) should also be in normal engagement, so that the normal transmission of the rotor. Otherwise, even if it can rotate, it may appear in the crown, the gap between the two rotors big and small. In this state, the adjustable gear to connect the hub screw loose and pull out the positioning pin, adjust, the rotor meshing and gear meshing at the same time reach the normal state of engagement, then the gap around the uniform, re-tighten Screw, heavy hinge pin hole and install pin positioning. If the rotor outer diameter and pump casing clearance somewhere too large, you can loosen the cap and pump housing connection screws, pull out the positioning pin, to be adjusted until the gap evenly, and then tighten the screws, heavy hinge End cap and pump housing positioning pin hole and fitted with tapered pins.
(4) the ambient air temperature will reduce the amount of pumping, in view of this situation, try to reduce the injection temperature.
2 Fault phenomenon: the vacuum is not high enough Cause: (1) the intake system is not tight, there is leakage phenomenon; (2) the pump itself is not tight, leaks at the shaft seal; (3) rotor and rotor or rotor The gap with the shell is too large, the air temperature is too high: (4) the pressure difference between the inlet and outlet of the pump gas medium is too large.
Remedy: The first three ways to solve the problem are the same as above. Among them, the air temperature is too high, will reduce the degree of vacuum, if it is a wet pump can be injected into the air inlet cold water, if the pump is dry at the outlet cooler, reducing the air temperature. Excessive pressure on paragraph (4) for many reasons, such as dry-type pump to check the safety valve (relief valve) is not functioning, such as failure out of gas pressure may be high, if the wet pump may be the outlet seal pressure is too high Or the export diameter is too small, too many elbows caused by increased export resistance, to be ruled out for the actual situation.
3 Symptoms: pump restart after parking difficult reasons: sometimes the pump in continuous operation, did not find anything unusual, once stopped in a short period of time, then start to feel difficult, or even can not start, which If the phenomenon occurs, the wet pump may have the following reasons: (1) The inner wall of the pump casing and the excessive scale deposition on the outer surface will block the gap; (2) When installing or replacing the intake pipe, Not well clean the tube, resulting in welding slag or other hard debris into the pump; (3) the rotor occurs in series, turn in the end and the end cover friction and increased resistance; (4) the rotor Shaft bending, rotor or synchronous gear biting.
Remedy: (1) into the pump cooling water, some untreated hard water, calcium is too heavy to produce deposition in the pump, especially untreated hard water in the pump at 50-60 ℃ temperature work, It is easier to deposit and become a scale to plug the pump gap. There are two solutions: one for the mechanical method is to use a blade or scraper scale removal, the other way is to use chemical methods available concentration of 5% to 10% hydrochloric acid. Among them, the chemical method of cleaning scale after the end of the steam and water to be used to wash, so as to avoid equipment corrosion. In order to avoid serious scaling phenomenon, the cooling water should be treated at a temperature below 20 ℃ clean cold water; (2) Before the tube is installed, be sure to clean the tube, in the case of conditions, the first tube wall Clean and then purge with compressed air; (3) take out the rotor and reassemble, and find out the reasons for the specific circumstances to be properly handled; (4) the rotor removed from the pump housing, and put it in two A parallel and contour knife on the mouth or similar, with a dial indicator to check whether the bending and bending of the rotor shaft size and direction, such as the bending is small with the press straightening, such as bending a large Need to be replaced.
4 Symptoms: Pump noise increases during operation causes: (1) the friction between the rotor and the rotor or between the rotor and the housing is uneven or inappropriate, in which case the noise may increase dramatically; (2) Synchronous gear meshing is not good, or the gap between the teeth is too large, or the lack of oil in the gear box, teeth and teeth in a dry friction state, then the gear box noise will increase dramatically: (3) the pump High speed, the working medium (air and water) in the pump chamber and the surge tank to produce a violent collision, and even the pump also vibrates, of course, the noise will increase.
Remedy: To carefully analyze the audit to find out where the noise originated, and then find out the causes of noise, followed by ways to reduce noise is also there. (1) If the rotor and the rotor or the rotor and the pump casing friction noise and this is completely audible, according to the method of adjusting the rotor clearance described above, carefully adjusted so that each gap are met the requirements: ( 2) Loosen one of the synchronizing gears, the hub coupling screw of the gear with the hub inserted, and pull out the dowel pin to turn the ring gear so that it engages normally. (3) If the speed is indeed too high, you can change the pulley and reduce the speed, or at the same time in the export side of the surge tank to add a silencer.
Method of exclusion:
(1) If the pump speed is not enough, and the amount of pumping is proportional to the pump speed, pump pumping capacity will decline. There are two cases; one is the pump speed is not equipped, that is, the diameter of the pulley is not suitable, you can change the pulley, change the diameter of the pulley; the other may be improper belt installation, not tension, belt slip And reduce the speed, which can adjust the motor position, the belt stretched to a certain tightness.
(2) to find out where leaks, if the connection flange leaks, it may be due to loosening of the connection screw, washer crushing deterioration or flange surface uneven; so at the shaft seal at the leak, it may be Sealed cup is not installed or broken, then replace the cup and install positive; if the packing seal, can be pulled into the filler out, replace the new, but the filler interface must be lap and overlap each other , The interface of the first lap must be staggered with the lap of the second lap and can not be in the same position.
(3) If the gap between the rotor and the rotor profile is not uniform, the gap is large at the circling and the other one is small. This is because the meshing condition of the synchronizing gear is not well adjusted during assembly, The gear wheel is fixed on the hub, and the hub of the other gear is made to be adjustable, because the two rotors have a conjugate surface and are normally meshed with each other. At the same time, the outer end of the transmission gear (synchronous gear) should also be in normal engagement, so that the normal transmission of the rotor. Otherwise, even if it can rotate, it may appear in the crown, the gap between the two rotors big and small. In this state, the adjustable gear to connect the hub screw loose and pull out the positioning pin, adjust, the rotor meshing and gear meshing at the same time reach the normal state of engagement, then the gap around the uniform, re-tighten Screw, heavy hinge pin hole and install pin positioning. If the rotor outer diameter and pump casing clearance somewhere too large, you can loosen the cap and pump housing connection screws, pull out the positioning pin, to be adjusted until the gap evenly, and then tighten the screws, heavy hinge End cap and pump housing positioning pin hole and fitted with tapered pins.
(4) the ambient air temperature will reduce the amount of pumping, in view of this situation, try to reduce the injection temperature.
2 Fault phenomenon: the vacuum is not high enough Cause: (1) the intake system is not tight, there is leakage phenomenon; (2) the pump itself is not tight, leaks at the shaft seal; (3) rotor and rotor or rotor The gap with the shell is too large, the air temperature is too high: (4) the pressure difference between the inlet and outlet of the pump gas medium is too large.
Remedy: The first three ways to solve the problem are the same as above. Among them, the air temperature is too high, will reduce the degree of vacuum, if it is a wet pump can be injected into the air inlet cold water, if the pump is dry at the outlet cooler, reducing the air temperature. Excessive pressure on paragraph (4) for many reasons, such as dry-type pump to check the safety valve (relief valve) is not functioning, such as failure out of gas pressure may be high, if the wet pump may be the outlet seal pressure is too high Or the export diameter is too small, too many elbows caused by increased export resistance, to be ruled out for the actual situation.
3 Symptoms: pump restart after parking difficult reasons: sometimes the pump in continuous operation, did not find anything unusual, once stopped in a short period of time, then start to feel difficult, or even can not start, which If the phenomenon occurs, the wet pump may have the following reasons: (1) The inner wall of the pump casing and the excessive scale deposition on the outer surface will block the gap; (2) When installing or replacing the intake pipe, Not well clean the tube, resulting in welding slag or other hard debris into the pump; (3) the rotor occurs in series, turn in the end and the end cover friction and increased resistance; (4) the rotor Shaft bending, rotor or synchronous gear biting.
Remedy: (1) into the pump cooling water, some untreated hard water, calcium is too heavy to produce deposition in the pump, especially untreated hard water in the pump at 50-60 ℃ temperature work, It is easier to deposit and become a scale to plug the pump gap. There are two solutions: one for the mechanical method is to use a blade or scraper scale removal, the other way is to use chemical methods available concentration of 5% to 10% hydrochloric acid. Among them, the chemical method of cleaning scale after the end of the steam and water to be used to wash, so as to avoid equipment corrosion. In order to avoid serious scaling phenomenon, the cooling water should be treated at a temperature below 20 ℃ clean cold water; (2) Before the tube is installed, be sure to clean the tube, in the case of conditions, the first tube wall Clean and then purge with compressed air; (3) take out the rotor and reassemble, and find out the reasons for the specific circumstances to be properly handled; (4) the rotor removed from the pump housing, and put it in two A parallel and contour knife on the mouth or similar, with a dial indicator to check whether the bending and bending of the rotor shaft size and direction, such as the bending is small with the press straightening, such as bending a large Need to be replaced.
4 Symptoms: Pump noise increases during operation causes: (1) the friction between the rotor and the rotor or between the rotor and the housing is uneven or inappropriate, in which case the noise may increase dramatically; (2) Synchronous gear meshing is not good, or the gap between the teeth is too large, or the lack of oil in the gear box, teeth and teeth in a dry friction state, then the gear box noise will increase dramatically: (3) the pump High speed, the working medium (air and water) in the pump chamber and the surge tank to produce a violent collision, and even the pump also vibrates, of course, the noise will increase.
Remedy: To carefully analyze the audit to find out where the noise originated, and then find out the causes of noise, followed by ways to reduce noise is also there. (1) If the rotor and the rotor or the rotor and the pump casing friction noise and this is completely audible, according to the method of adjusting the rotor clearance described above, carefully adjusted so that each gap are met the requirements: ( 2) Loosen one of the synchronizing gears, the hub coupling screw of the gear with the hub inserted, and pull out the dowel pin to turn the ring gear so that it engages normally. (3) If the speed is indeed too high, you can change the pulley and reduce the speed, or at the same time in the export side of the surge tank to add a silencer.
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