How to prevent reverse rotation of water ring vacuum pump

What happens when the water ring vacuum pump reverses and how to prevent it
This is a schematic diagram of a water ring vacuum pump

We can see from the picture; Suppose it is a reverse case;
1. The inlet and exhaust ends will be reversed. Due to the bending direction of the impeller, the inlet end will exhaust and drain slightly, and the exhaust end will intake slightly, but it will not achieve its rated effect.
2. If it operates for a long time, it is possible to turn negative pressure into positive pressure, but there will be no vacuum.
3. In addition to the impeller, the water ring pump also has a very important thing, the valve plate. When the water pump reverses, the valve plate loses its function.
4. As for any damage, the problem is not big, and the impeller bolts may be loose.
Prevent reverse rotation. In order not to loosen the lock nut on the rotor, it is recommended that you disconnect the coupling and test the motor.

After reversing, you will not be able to exhaust, and your suction vacuum will be very low or not. As long as the motor is not connected to the wrong line, it is impossible to turn over.

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Clarify 3 problems before vacuum measurement

 

First of all, we should have a more comprehensive understanding of all aspects of the tested object.
It mainly includes: the properties of the tested object, whether it is condensable gas or non condensable gas, whether it is single or mixed, inert gas or active gas or corrosive gas; Whether the air flow state is steady or instantaneous, whether it is uniform or non-uniform; Whether the temperature is isothermal or non isothermal, high temperature or low temperature; Whether there are special conditions such as magnetic field, electric field, vibration, impact, acceleration, charged particles, radiation, etc.
Secondly, according to the situation of the tested object and the research purpose, correctly select the vacuum gauge, and need to understand the principle, range and limitations of the selected vacuum gauge, so as to use the vacuum gauge correctly.
Third, we should understand the interaction between the vacuum gauge and the measured object.
The principles of various vacuum gauges are different, and its introduction may cause changes in some states of the measured object; At the same time, the gas in the measured object may also affect the vacuum gauge, change its performance and interfere with its work.
Moreover, when introducing the technical characteristics of vacuum measurement, fozhen has mentioned that the measurement accuracy of vacuum measurement is not high due to many influencing factors and difficult to control. Therefore, in order to carry out ideal vacuum measurement, we must fully understand the above-mentioned problems, so as not to cause greater errors or errors.

Vacuum pump and vacuum generator are widely used in pharmaceutical and food industry  

The sealing between the vacuum pump and the system shall be reliable

The vacuum pump shall be able to discharge all steam volume caused by the whole process of vacuum technology processing process under its pressure. Properly constitute the vacuum pump. Because the vacuum pump has optional vacuum pumping, even if a certain pump is selected, the vacuum pumping regulations cannot be considered. Multiple pumps must be formed to fill each other to consider the vacuum pumping regulations. For example, the titanium lift pump has a high pump efficiency for hydrogen, but can not pump helium, while the three pole magnetron sputtering ion pump (or the two pole asymmetric encrypted negative magnetron sputtering ion pump) has a certain pump efficiency for argon. If the two are combined, the vacuum pump equipment will obtain a good vacuum value.
Vacuum pump
When the vacuum pump cannot work under atmospheric pressure, the vacuum pump must be prepared for treatment. The inlet and outlet working pressure of the vacuum pump is less than atmospheric pressure, so the front pump must be used, so it must form an application pump. Provisions of vacuum technology on oil environmental pollution. If the machinery and equipment are strictly managed without oil stains, various gasoline free pumps should be selected, such as water ring pump, carbon molecular sieve suction pump, magnetron sputtering ion pump, cryogenic pump, etc. If the regulations are not strict, you can choose an oil vacuum pump, plus some anti oil environmental pollution countermeasures, or cold trap, baffle, oil trap, etc., you can also clean up the regulations of the vacuum pump.
The vacuum pump shall be installed in a solid place on the ground, with sufficient indoor space nearby, which is conducive to inspection, maintenance and repair. The subgrade engineering level shall be maintained under the vacuum pump base. It is recommended to pad damping rubber or cast and install with anchor screws at the four corners of the base to ensure that the vacuum pump operates stably and has little vibration.
The connecting pipeline between the vacuum pump and the system software shall have reliable sealing performance. For small vacuum pumps, metal hose can be used, and acid and alkali resistant vulcanized rubber can be used as the connecting gasket. For small vacuum pumps, vacuum pump rubber hose can be used for connection. The pipeline shall not be lower than the breathing specification of the vacuum pump, and the specified pipeline shall be short and less bends. (when welding steel pipe, the welding slag in the pipeline shall be eliminated, and it is forbidden to penetrate into the vacuum pump chamber.)

Liquid Ring Vacuum Pumps Used in Sugar Mill 

What if the vacuum pump make-up solenoid valve cannot be opened

 Vacuum pump refers to the components or machinery and equipment that vacuum the evacuated vessels by means of mechanical equipment, physics, organic chemistry or physics. In terms of popularization, vacuum pump is the equipment that improves, creates and maintains vacuum pump in a closed in various ways.

Vacuum pump
The structure inside the vacuum pump of the vacuum pump manufacturer is very simple, but the installation gap is small. When the gap between the centrifugal impeller plan and the disc plan is maintained at 0.2mm, the vacuum pump can be caused normally. When the gap between the disc and the centrifugal impeller is too large, the vacuum value of the vacuum pump will be reduced or there will be no vacuum value. If the gap is too long, the operation of the motor is laborious and it is very easy to damage the motor. The water ring vacuum pump of the vacuum pump manufacturer uses tap water as cutting fluid, which is low-cost. Because the water bodies in various regions are different, some water bodies are hard. After the vacuum pump is used for a period of time, it is very easy to cause dirt in the pump (the same as the milky dirt in the boiling teapot). The gap between the disc and the centrifugal impeller becomes small, and the dirt in the pump is not eliminated at this moment, The motor runs hard and is very easy to damage the motor or crush the centrifugal impeller. The treatment method is to add the boiler descaling agent to the pump (it is not necessary to disassemble the pump). After 20 minutes, clean it with cold water. Pay attention not to discharge the boiler descaling agent into the cold circulating water of the vacuum pump. If it is difficult to buy boiler descaling agent, dilute hydrochloric acid can be used to solve it. Sulfuric acid has slight corrosion on the pump, which is not better than using boiler descaling agent.
The water replenishing and moisturizing relay of the vacuum pump gas-liquid separator of the vacuum pump manufacturer can not be opened normally. The bypass valve must be manually opened to replenish water and moisturize the separation equipment. After on-the-spot inspection, it was found that the floating ball level gauge of the water pump pressure switch installed in the separation equipment was full of dirt, resulting in the magnetic induction switch can not be in all normal positions. As a result, when the separation equipment is in the low level instrument, the PLC did not receive the data signal of the low level instrument and sent out the instruction to open the water replenishment and humidity protection relay, so that the relay can be opened automatically.

Oil Vapor Booster Vacuum Pump used in Short Path Distillation progress

Reasons for the decrease of outlet pressure of centrifugal pump

(1) Motor reverse
Due to wiring, the steering of the motor will be opposite to the actual required steering of the centrifugal pump. Generally, observe the steering of the pump when starting. If the steering direction is opposite, replace any two wires on the motor terminal.
(2) The working point moves to high flow and low head
Generally speaking, the centrifugal pump has a continuous downward performance curve, and the flow increases gradually with the decrease of head. During operation, due to some reason, the back pressure of the pump decreases, and the working point of the pump passively moves to the low head point flow with the curve of the device, which will lead to the reduction of head. In fact, this is caused by external factors such as changes in equipment, which has no special relationship with the pump itself. At this time, as long as the back pressure of the pump increases, such as closing the outlet valve a little. The problem can be solved.
(3) Slow down
The important factors affecting the pump head of centrifugal pump are impeller outer diameter and pump speed. When other conditions remain unchanged, the pump head is directly proportional to the quadratic power of speed. It can be seen that the speed has a great influence on the pump head. Sometimes, if the speed of the pump is reduced due to some external reason, the pump head will be reduced accordingly. At this time, check the speed of the pump. If the speed is not enough, check the cause and solve it reasonably.
(4) Cavitation at inlet
If the suction pressure of the centrifugal pump is too low and lower than the saturated vapor pressure of the pumped medium, cavitation will be formed. At this time, check whether the inlet pipeline system is blocked, or whether the opening of the inlet valve is too small, or raise the liquid level of the suction tank.
(5) Internal leakage
When the gap between the rotating part and the stationary part of the centrifugal pump exceeds the design range, internal leakage will occur, which is reflected in the decrease of the discharge pressure of the pump, such as the gap between the impeller port ring and the interstage gap of multi-stage pump. At this time, corresponding disassembly and inspection shall be carried out to repair or replace the parts causing excessive clearance.
(6) Impeller passage blocked
If part of the flow passage of the impeller is blocked, the operation of the impeller will be affected and the outlet pressure will drop. Therefore, it is necessary to disassemble the pump to check and remove foreign matters. In order to prevent this problem from happening again, if necessary, a filtering device can be added in front of the inlet of the centrifugal pump.

roots vacuum pump of vacuum water diversion steps 

Replace the filter element of stainless steel vacuum pump

 

What role can the filter element play in the whole vacuum pump? The main purpose is to filter the impurities in the air, so as to maintain the vacuum in a clean state and facilitate the cleaning of the interior of the equipment. Since the filter element often filters various types of impurities and the dust has strong adhesion, it is necessary to replace the filter element regularly. How to replace the filter element of stainless steel vacuum pump? Just follow these steps.
1. Use method, maintenance and replacement time of stainless steel vacuum pump filter element in order to ensure product quality and maintain the safe operation of production equipment, the replacement of pump filter element shall be completed in detail step by step. Production operators shall record and supervise the replacement process. After receiving the production order to replace the pump filter element, first confirm that the system stops running, prepare a suitable spare filter element, check whether the filter element specification, material, size, O-ring material, model and other data are normal, and prepare disassembly tools, collection barrels, rags and other tools.
2. Clean the pump filter element housing, empty the periphery of the filter and leave the operation area. Wear protective equipment. Disconnect the filter that needs to be replaced from the system. Slowly open the exhaust port on the top of the filter to release the pressure, pay attention to the safety in the process, prevent material or liquid splashing, empty the material in the filter, open the filter cover with tools, take out the filter element, pack the filter element in plastic bags for scrapping, clean the inside of the filter with cleaning tools and cloth, and install a new filter element.
3. Open the plastic bag at the open end of the filter element of the stainless steel vacuum pump, check whether the O-ring is intact and in place, and install the material by flowing in from the outside of the filter element and flowing out from the inside of the filter element; Wet the O-ring and the socket of the filter element base with a suitable wetting agent, hold the end of the filter element close to the O-ring, insert the socket of the filter element completely vertically into the socket of the filter element base, insert the pump filter element, remove the filter element packaging bag, then install the metal cover and tighten the filter with tools; Close the discharge port of the filter, open the vent valve on the top of the housing, slightly open the inlet valve, let the material enter the housing until the liquid overflows from the vent valve on the top of the housing, and then close the vent valve. Pay attention to check whether there is leakage at the disassembly position, and slowly open the filter outlet valve until it is fully opened. Indicates that the replacement has been completed.
4. Pay special attention when replacing the filter element of vacuum pump: prevent pressure impact and prohibit reverse pressurization. When the pressure drop between upstream and downstream of the filter is greater than 0.3 MPa or the flow decreases significantly, the pump filter element shall be considered to be replaced. When installing the filter element, pay attention to the installation direction of the filter element, from the outside to the inside.
When replacing the filter element of stainless steel vacuum pump, pay attention to the installation position of the filter element. Only in the proper position can the installation effect of the filter element be guaranteed and the impurities can be effectively filtered out. At the same time, the filter element must be replaced regularly.

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