Causes of sudden vacuum drop during vacuum pump switching

 First, cause analysis

   1. The pneumatic valve and check valve of vacuum pump are jammed;
   2. Improper operation, stop the vacuum pump without confirming that the pneumatic inlet valve has been closed.
Second, the main phenomena are as follows
   1. The vacuum of the exhaust device drops rapidly, and the low vacuum gives an alarm;
   2. The liquid level of air-water separator of vacuum pump decreased.
III. treatment measures
   1. When the vacuum pump stops and the vacuum drops, start other vacuum pumps immediately.
   2. Immediately order the local personnel to open the manual valve beside the make-up water solenoid valve of the gas water separator to make up water to the high water level of the steam water separator.
   3. If the vacuum still drops and there is no tendency to turn back, the local personnel shall immediately close the pneumatic valve in front of the pneumatic valve of ᦇ 1 vacuum pump and the manual valve in front of the pneumatic valve, and start ᦇ 3 vacuum pump.
   4. When the vacuum drops too fast, manually reduce the load to below 400MW to prevent the unit from triggering RB. If RB acts, it shall be treated as RB normally.
   5. If the treatment is not timely and the vacuum is too low, which leads to turbine trip, it shall be treated as emergency shutdown.
IV. preventive measures
   1. The monitoring system is implemented for major operations;
   2. Switch according to the correct switching method, and make all possible assumptions;
   3. When the vacuum pump is stopped, the inlet valve can be closed first, and the pump can be stopped after confirming the closure.

Related products:

Rotary vane vacuum pump of typical application

Causes and hazards of emulsification of vacuum pump oil

The emulsification phenomenon of vacuum pump oil can be understood in this way from the perspective of physics. Because of the effect of surfactant, the phenomenon that two liquids that can not be mixed together can be mixed together is called emulsification phenomenon. Today, I'd like to talk about the causes and hazards of vacuum pump oil emulsification.
Vacuum pump
reason:
During the operation of vacuum pump, corrosive gas or gas containing water vapor may be inhaled. Then the corrosive gas will corrode the metal parts inside the pump, and react with the vacuum pump oil. The gas containing water vapor will also cause the vacuum pump oil to emulsify.
influence:
The use of vacuum pump is very wide, from the reason of vacuum pump oil emulsification, in the process of medicine, food, ceramics and other industries, it is easy to emulsify. Because in the process of vacuum dehydration, a lot of water vapor will be discharged into the pump oil, which can not avoid the vacuum pump oil being emulsified.
harm:
The emulsification of vacuum pump oil not only affects the service life of pump oil, but also affects the deterioration of pressure. This is one of the common faults of vacuum pump. The normal operation of the vacuum pump is seriously affected.
Methods to prevent emulsification of vacuum pump oil:
It is the simplest way to choose the pump oil for anti emulsification. The pump oil has good anti emulsification and strong oil separation ability. Steam and condensate gas can be partially eliminated by opening the gas valve. You just need to remember that low viscosity pump oil is more demulsifying than high viscosity pump oil. The effect of adding pump oil is more obvious than that of not adding pump oil.
Cleanliness of vacuum pump oil:
(1) The oil filling window must be clean and tidy. It is strictly forbidden to be exposed to the sun and stored in the open air. It should be stored in a dark, dry and ventilated place to prevent mixing of moisture and dust.
(2) The refueling appliance must be a special equipment, not a container containing other oil or solvent; Suction pump.
(3) When taking or loading the oil, the light rain around the end of the barrel must be cleaned to prevent the impurities from mixing into the oil and causing the wear of the pump.
(4) When changing the oil of the vacuum pump, the unused oil in the pump must be cleaned. Pour the new oil into the pump, slowly rotate the pump shaft, clean the remaining oil in the pump chamber, and repeat the cleaning.
(5) When mineral oil is exchanged with ester oil or other synthetic oil, the pump should be disassembled for thorough cleaning, including that every part must be immersed in ester oil to prevent contamination.

Related products:

Oil type rotary vane vacuum pump -- direct drive and belt type drive

Several points need to be paid attention to when settling the claim with roots blower manufacturer

1. The wires are reversed
The wires are reversed! This problem, has always been a small problem, but a problem is a big problem, and "toothache" the same reason, in the installation of the fan, do not reverse the motor wire, wire reverse, the motor instantly burned! This kind of fault, the manufacturer will not give us a claim, this is a manual operation error, roots blower itself has no other problems.
2. Forget to add lubricating oil
The gear box is filled with lubricating oil. When it leaves the factory, it will not add lubricating oil for us. It is a separate bottle, and some manufacturers have installed it. Therefore, when it is installed and started, it is necessary to check the oil tank. If the roots blower is started without lubricating oil, the gear will be damaged and the motor will be burned instantly. It's good to contact the supplier with such fault reason, and they can answer our phone.
3. Forced frequency conversion
Roots blower can be divided into frequency conversion and non frequency conversion, mainly due to the change of motor. Some customers have experience in using roots blower, and will automatically refit the motor, and refit the non frequency conversion motor into frequency conversion control. If the fault is caused within the warranty period after the transformation, the fan manufacturer will not settle the claim.
4. Negative pressure start
The start-up of Roots blower is no-load start-up. Negative pressure start-up causes instantaneous overpressure of blower, which causes other faults. The manufacturer will not settle the claim, which also belongs to manual operation error. The correct start-up mode is: no-load start-up, slowly close the vent valve.
5. Check valve not installed
The function of check valve is very important. When roots blower is running, if the gas flows back, the check valve can effectively prevent the gas return. If the check valve is not installed, the gas return will cause the blower to reverse. The reverse rotation of Roots blower is very harmful, and the blower may be burnt out for a period of time. Therefore, the gas return will cause the blower to reverse and burn out because the check valve is not installed, Manufacturers will not care about us~
The above five are common human operation errors, and the following three are also human operation errors, but they are not very important. If the following three are not paid attention to, they may also cause indirect fan damage. Let's continue to look at the following:
6. Anchor bolt
The anchor bolt is an accessory for fixing the fan. Some customers' anchor bolts are lost or broken, and some will directly weld a steel bar. The welding is just enough. Huadong motor has seen the "chicken excrement welding" technology used to weld the anchor bolts. When Roots fan is used in the later stage, the probability of failure is very high.
7. Elastic joint
The flexible joint of Roots blower outlet link can effectively prevent the impact of vibration on the pipeline. In order to reduce the vibration of the blower, some customers directly link the outlet to the flange. Although it can be operated in this way, it is not scientific.
8. Imported muffler
Roots blower and muffler are assembled and delivered separately. After the arrival of the goods, we need to install the muffler, and then carry out the trial operation. Do not install the imported muffler for direct trial operation. There is a certain risk. If the foreign matters enter through the imported muffler, it is easy to cause the fan to get stuck.

Related products:

Roots vacuum pump is used for electrolyte filling and degassing

Energy saving tips of using water pump

1. Shorten the line.
2. It's not the type of "antiaircraft gun" outlet. Because the outlet pipe increases the energy consumption. At the same time, the pool had a pump.
3. Increase the diameter of outlet pipe as much as possible.
4. Remove the pipe blockage in time. Foreign matter left in the inlet, the impeller in the shell or split flow will be taken to save water.
5. As far as possible direct drive coupling, due to direct drive belt transmission efficiency coupling rate.
6. The filter can be removed on the premise of ensuring clean water.
7. Is carefully reviewed to prevent pump seals from entering the pump. If you pump the air, the water will be greatly reduced.
8. Can be used for no engine or electric motor, gasoline engine, conditional three-phase asynchronous motor, no single-phase asynchronous motor.

Related products:

Rotary vane vacuum pump in IGBT module manufacturing process

Maintenance of vacuum pump: filter element blocked

 

Any kind of product has a service life, and the vacuum pump can't be avoided. In the process of use, various problems can't be avoided, and the vacuum pump needs to be repaired. Vacuum pump filter resistance and blockage is one of the two problems, always bothering consumers, the following yazhileide electromechanical technology to tell you the solution to this problem!
1、 Resistance loss
If we want to solve the problem, we must find the root of the problem. The same is true of the filter element resistance loss of vacuum pump. We must find out the cause of the resistance loss and what causes the filter element resistance loss. Only in this way can we find every method corresponding to each cause.
There are two main reasons for the resistance loss of vacuum pump filter element, one is the change of geometry. In this case, the filter element should be removed to see the degree of deformation. If it is slightly deformed, it can be slightly repaired and reused. If it is severely deformed, it should not be used any more, otherwise it will aggravate the damage of the vacuum pump.
The other reason is that high temperature oxidation and water droplet atomization make the filter element of Edwards vacuum pump have impurity particles and lead to filter element resistance loss. Some of them are left behind during cleaning. At this time, it is necessary to thoroughly clean the filter element, first use a brush or blower to get out the impurity particles, and then use the cleaning agent to clean up, no more impurities left.
The above are two ways to solve the resistance loss of vacuum pump filter element. I hope you can use and maintain it correctly and extend its service life as far as possible.
Maintenance of vacuum pump: filter element blocked
2、 Clogging
An effective way to solve the blockage is to install the vacuum pump exhaust filter element. When the vacuum pump filter element is working, it will filter some impurities in water or oil. After installing the vacuum pump exhaust filter element, it will absorb the impurities in water and oil. This can ensure the Edward vacuum pump to work in a clean environment and avoid the blockage of the vacuum pump.
In addition, in addition to the problem of blockage, the filter element of the vacuum pump also needs routine maintenance. The staff should listen carefully to the noise of the vacuum pump, check the impurities in the filter element of the vacuum pump, and check whether there are oil stains in the exhaust port. If there is any abnormal situation, the vacuum pump repairman should repair or replace the parts immediately.
The above is to tell you how to solve the problem of vacuum pump filter plugging, you must carefully observe its operation, to ensure normal work.

Related products:

Vacuum pump used in Vessel

G type single screw pump common problems, single screw pump maintenance methods?

Because the wearing parts of screw pump have a certain life, after long-term operation, the wearing parts will be worn and have abnormal faults, so it is necessary to replace new accessories, such as screw pump stator, rubber ball, screw shaft and other accessories. Screw pump is a positive displacement rotor pump, which depends on the volume change of sealing cavity formed by screw and bushing to inhale and discharge liquid. Screw pump is divided into single screw pump, double screw pump, three screw pump and five screw pump according to the number of screw. So what are the common problems of single screw pump? What are the maintenance methods of screw pump? Let's take you to know:
Common problems and maintenance methods of single screw pump
1. Causes of severe vibration or noise of pump body
Screw pump installation is not firm, pump installation is too high, more than the pump suction capacity; The motor ball bearing is damaged; The main shaft of water pump is bent or not concentric or parallel with the main shaft of motor; Air leakage at suction pipe or pump suction end; The suction line is blocked. The solution is to install the pump stably or reduce the installation height of the pump, reduce the resistance of the suction pipeline, clean or increase the filter, and reduce the viscosity of the medium; Replace the motor ball bearing; Correct the bent pump spindle or adjust the relative position between the pump and the motor; Eliminate air leakage of suction pipe and pump suction end; Remove the blockage of the suction pipe.
2. Causes of overheating of drive shaft or motor bearing:
Lack of lubricating oil or bearing rupture, etc. The solution is to add lubricating oil or replace the bearing.
3. Screw pump heating:
Serious friction of rotating parts in the pump; The oil return hole of mechanical seal is blocked; The oil temperature is too high; The installation is not correct and the rotating parts are not concentric. The solution is to check and replace the worn parts; Dredge the oil return hole; Reduce the oil temperature properly; Adjust and correct assembly and installation accuracy.
4. No flow output:
The suction pipe is blocked or leaking; The suction height exceeds the allowable suction vacuum height; The motor reverses; It is caused by high viscosity of medium. The solution is to check the suction pipeline, reduce the suction height, change the motor steering, heat the medium and so on.
5. Insufficient pump pressure:
Whether the seal leaks; In the state of equipment stop, when the screw pump has self closing function, check the water supply; Whether the model selection is correct; There's too much pressure at the exit. Wait. The pressure of the pump is insufficient. There are many problems involved. The simple thing is to check whether the inlet is blocked. I'm looking at the motor. If these two are OK, I have to open it down to see if the screw and bearing are broken
6. Flow decrease:
The suction pipe is blocked or leaking; The spiral sleeve and bushing are worn; The spring of safety valve is too loose or the contact between valve disc and valve seat is not tight; The motor speed is not enough; Installation too high, more than the pumping capacity, shaft seal leakage. The corresponding solution should be to repair the suction pipeline; When the wear is serious, the parts should be replaced; Adjust spring, grind disc and seat; Repair or replace the motor; Reduce the suction height and suction pipe resistance; Repair or replace the shaft seal.
7. Large amount of oil leakage of mechanical seal:
The assembly position is not right; The gland is not flattened; The sealing surface of moving ring or stationary ring is damaged; The dynamic ring or static ring seal is damaged. The solution is to re install as required; Adjust the gland; Grind the sealing surface or replace it with a new one; Replace the sealing ring.
8. Mechanical seal heating:
The sealing fluid pipeline is blocked; The compression of mechanical seal spring is too large. The solution is to eliminate the sealing pipeline fault; Reduce the amount of spring compression.
9. The shaft power increases sharply
The discharge pipeline is blocked; Serious friction between screw and pump sleeve; The viscosity of medium is too high; The installation is not correct and the rotating parts are not concentric. The solution is to stop the pump and clean the pipeline; Repair or replace relevant parts; Raise the temperature of the medium to reduce the viscosity; Adjust and correct assembly and installation accuracy.
10. Holding shaft (unable to rotate)
The temperature is too high and the parts in the pump expand excessively; Insufficient starting torque. The solution is to start the pump after cooling by hand; Check the drive.

Related products:

Molecular vacuum pump for glass coating

Structure and energy characteristics of vacuum pump oil

 

The performance curve of vacuum pump unit is used to express the conversion characteristics of water flow energy under different working conditions, which is the external manifestation of the internal flow law of the pump. Like ordinary centrifugal pump, the constant speed characteristic curve of engine cooling water pump of vacuum pump unit is the relationship curve of flow and head, flow and efficiency, and flow and power at a certain speed, As shown in Figure 3a, it can directly describe the operation performance of the engine cooling water pump at constant speed. However, because the speed of the engine cooling water pump is constantly changing when it works, the variable speed characteristic curve of the pump must be given, as shown in Figure 3B. The variable speed characteristic curve of the engine cooling water pump mainly maps the flow, head and power curves corresponding to different speeds, In order to reflect the comprehensive performance of engine cooling water pump more intuitively, it is necessary to draw the two performance curves on the same graph to show the performance parameters, which increases the hydraulic loss and reduces the efficiency. At the same time, the cavitation phenomenon of engine cooling water pump is more likely to occur under high temperature, high speed and large flow conditions.
At the same time, the flow in the top clearance of the semi open impeller causes the main flow to collapse and the flow velocity in the impeller passage to increase, which worsens the cavitation characteristics of the impeller and seriously affects the normal operation of the cooling system, The special working environment and matching condition decide that the design of engine cooling water pump is different from ordinary centrifugal pump. As the "heart" of cooling system, engine cooling water pump works in harsh environment with extremely limited space, The working life of the pump should be equal to or more than that of the engine overhaul period. Therefore, the reliability requirements of the engine cooling water pump and its components, such as water seal, bearing, pump shaft and impeller, are very high, so it is necessary to realize the same service life of the pump. However, due to the compact assembly structure, the shaft bearing is widely used in the engine cooling water pump to replace the common shaft and bearing combination in the centrifugal pump, The axial force produced by cooling fan and pump impeller will also change with the constant change of rotating speed. The clearance between pump shaft and support will increase noise and vibration, which will have an adverse impact on the operation performance and water seal work of the pump.

Related products:

liquid ring vacuum compressor in Flare gas recovery of application

Maintenance and repair procedures for multistage centrifugal pump

General rules for maintenance and repair of multistage centrifugal pump
This regulation is applicable to the maintenance and overhaul of general multi-stage centrifugal pump with suction diameter of 100 mm and above for transporting clean water with temperature not higher than 80 ℃ and other liquids with similar chemical properties; The maintenance and overhaul of multi-stage centrifugal pump with liquid temperature higher than 80 ℃ but not higher than 110 ℃ or suction diameter less than 100 mm can also be referred to. The maintenance and overhaul of the motor shall be carried out according to the motor maintenance and overhaul regulations.
Maintenance interval of multistage centrifugal pump
Maintenance category maintenance is divided into regular maintenance and irregular maintenance. Regular maintenance is divided into minor repair and major repair.
Maintenance interval
Maintenance contents of multistage centrifugal pump
1. Replace the packing or repair the mechanical seal.
2. Check the bearing and correct the coupling.
3. Tighten the bolts of all parts to eliminate the defects and leakage during operation.
4. Clean or repair cooling water and lubricating oil (grease).
5. Clean and repair the suction filter screen, check valve and operation system valve.
6. Check the bending of pump shaft and adjust the clearance of each part.
7. Check and repair the end contact between the balance disc and the balance ring, and the end contact between each section, impeller hub, shaft sleeve, balance disc hub, shaft shoulder and fastening nut.
8. Check or repair the bearing bush, and adjust the parallelism between the pump axis and the pump body foundation plane.
9. Align the coupling.
10. Repair or replace impeller and other main parts, replace bearing gasket and other vulnerable parts.
11. Clean the whole machine and auxiliary machine, remove rust and paint.

Related products:

Circulating fluidized bed Roots blower

Vacuum pump switch matters to know

 In the process of using industrial equipment, the incorrect switch mode will cause certain loss to the equipment. If it is done for a long time, the service life of the equipment will be greatly shortened, and the roots vacuum pump is the same. Today, let's talk about the matters needing attention when turning on and off the roots vacuum pump?

Switch on and off of Roots vacuum pump
1. Boot up
In general, roots vacuum pump is used in combination with the front stage pump. In addition to multistage, wet and air-cooled Roots pump, it can avoid equipment damage caused by too high pressure difference. Therefore, before starting the roots pump, start the front pump, open the valves on the pre pumping pipeline of the front pump and the inlet and outlet valves of the roots pump, close the valves on the pre pumping pipeline after the pressure in the system reaches the allowable inlet pressure of the roots pump, and then start the roots pump.
2. Shut down
First of all, close the air ballast valve of the front stage oil seal mechanical pump, then close the intake valve of Roots vacuum pump, and then stop roots pump first, and then stop the front stage pump. Do not mistake the shutdown procedure. At the same time of stopping the front stage pump, immediately release the air to the air inlet of the front stage pump and close the cooling water inlet valve.
Therefore, it is necessary to operate according to the correct on-off mode, and pay more attention not to make mistakes in the on-off operation steps, otherwise the wrong operation sequence will not only lead to the failure of on-off, but also have a huge adverse impact on the roots vacuum pump. And Xiaobian suggests that you can take some maintenance measures after using roots pump equipment, so as to prolong its service life.

Related products:

Vacuum pumps are used for membrane separation

Important issues on maintenance of water ring vacuum pump in chemical plant

At present, among the vacuum pump manufacturers, the production proportion of water ring vacuum pump is relatively large, and the competition is relatively large. Most of the water ring vacuum pumps are used in chemical plants. If the water ring vacuum pump used by customers has problems and needs to be returned to the factory for maintenance and testing, the following matters must be paid attention to:

When the customer returns the water ring vacuum pump to the factory for maintenance, remind the customer to remove the working fluid in the cavity of the water ring vacuum pump, and use the corresponding cleaning fluid to clean the corrosiveness and peculiar smell of the vacuum pump before returning to the factory. Because the chemical plant has a better understanding of its own production materials, it also has corresponding treatment and emergency measures to deal with the emergency. If the water ring vacuum pump with serious toxicity and odor is returned to the vacuum pump manufacturer, the manufacturer will not be able to deal with it. If it is serious, it will cause environmental pollution or personal injury, resulting in greater losses. Our water ring vacuum pump manufacturers in the chemical production units of water ring vacuum pump ready to return to the factory must pay attention to remind customers. If the customer returns to the factory without cleaning the vacuum pump, don't rush to dismantle and inspect the vacuum pump. First, communicate with the chemical factory to understand the chemical properties of the materials. At the same time, ask the chemical factory or ask the chemical factory to provide the corresponding neutralization or cleaning solution. On the premise of ensuring that it will not pollute the environment, treat the vacuum pump.

Related products:

Liquid ring vacuum pump used in grain industry

Vacuum drainage preloading method

Vacuum drainage preloading method is a relatively new soft soil reinforcement technology, it is to belong to a kind of drainage consolidation method, level of it by laying drainage sand cushion and setting up the vertical row of water in the soft soil foundation, and laying on the sand cushion is not breathable film sealing device, with the aid of pipeline buried in the sand cushion, through vacuum device, negative pressure generated in the soil, The pore water in the soil is pumped out, so as to reduce the pore water pressure, increase the effective stress, so that the soil consolidation, reduce the late settlement, improve the bearing capacity of the foundation.
When vacuum is pumped, negative pressure gradually forms in the surface sand cushion and the vertical drainage channel successively, resulting in the pressure difference between the soil and the drainage channel and the cushion. Under the action of this pressure difference, the pore water in the soil is constantly discharged from the drainage channel, so that the soil is consolidated. It is mainly reflected in the following aspects:

1) The load on the film is equal to the pressure difference between inside and outside the film.

2) The groundwater level decreases and the additional stress increases accordingly.

3) The closed air bubbles are discharged, and the permeability of the soil is increased.
Layout of measurement line → laying of main branch filter and drainage pipe → laying of upper sand cushion → leveling of sand surface → laying of PVC film → construction of sealing ditch → setting of measurement marks → installation of vacuum pump → vacuum preloading and consolidation soil layer.

The construction content of vacuum drainage preloading method is mainly composed of four parts:

(1) the construction of a vertical and horizontal drainage channel, that is, the construction of plastic drainage plate and sand cushion;

(2) to the construction of a reinforced foundation and atmospheric isolation of the guarantee of an airtight sealing layer;

(3) to set up a set of high efficiency vacuum device. That is, in the sand cushion layer laid in the main and filter pipe network and the installation of vacuum pump and other equipment outside the sealing system;

(4) to set up a set of inspection system to ensure that the construction can be carried out according to the design requirements.
Vacuum preloading is to vacuum under the sealing membrane covering the ground, so that the pressure difference is formed inside and outside the membrane, so that the consolidation pressure of the clay layer is generated. That is, under the condition of constant total stress, the effective stress can be increased by reducing pore water pressure. Vacuum preloading and precipitation preloading are drainage consolidation under negative excess hydrostatic pressure, which is called negative pressure consolidation.

Related products:

Screw vacuum pump in real immersion equipment Application

https://vacuumfurnace.enjin.com/forum/m/50056207/viewforum/9291042
https://yibomine.proboards.com/board/1/general-discussion

Can centrifugal pump still be used in case of evacuation

 Centrifugal pump evacuation: centrifugal pump in practical application, there will always be a variety of conditions, evacuation phenomenon is one of the many reasons for centrifugal pump failure, always let everyone feel a headache. If the centrifugal pump pumping phenomenon how to do? Centrifugal pump evacuation with the situation, causes and treatment measures are summarized, I hope to help your work.

After or during the evacuation of the pump
1) The vibration of the pump body is large, the dynamic and static rings of the mechanical seal will continue to have intermittent collision, leading to leakage, and the mechanical seal structure will fail in serious cases;
2) The compression of the dynamic and static rings of mechanical seal is the sum of the medium pressure and the preload of the spring. When the medium pressure is removed, the contact pressure of the dynamic and static rings will become smaller, and the seal will fail;
3) After the pump is pumped out, the end faces of the dynamic and static rings of the mechanical seal adopting the self flushing scheme (that is, flushing with the pumping medium) lose the cooling and lubrication, dry friction occurs, and the mechanical seal fails.
1、 Causes of evacuation
1. Air leakage occurred at the inlet of centrifugal pump.
2. The inlet of centrifugal pump is blocked.
3. The inlet pressure of centrifugal pump is not enough.
4. The medium temperature at the inlet of centrifugal pump is too high and the saturated steam is too large.
5. The inlet valve of centrifugal pump is not opened or the valve core falls off.
6. Centrifugal pump outlet opening is too large (small).
7. Centrifugal pump seal oil with water.
8. The liquid level in centrifugal pump tower or container is low or no liquid level.
9. Centrifugal pump impeller or inner wear ring wear seriously.
10. The motor of centrifugal pump reverses.
2、 The corresponding treatment method of evacuation
1. If there is air leakage at the inlet, stop the pump and check the leakage inlet pipeline and flange of the centrifugal pump.
2. If the inlet is blocked, stop the pump, check the leakage inlet pipeline and impeller of the centrifugal pump, and carry out maintenance after purging.
3. If the inlet pressure is not enough, the liquid level back pressure should be increased.
4. If the inlet medium temperature is too high, the medium temperature should be reduced to vent the steam in the centrifugal pump.
5. If the inlet valve is not opened or the valve core falls off, the valve should be opened or the pump should be replaced for maintenance.
6. If the outlet opening is too large (small), the valve opening should be adjusted appropriately.
7. If there is water in the sealed oil tank, dehydrate the sealed oil tank.
8. If the liquid level in the tower or container is low, the outlet valve of the centrifugal pump should be turned down temporarily or the pump should be stopped until the liquid level rises.
9. If the impeller or inner wear ring is worn, it should be replaced timely.
10. If the motor reverses, the steering should be adjusted in time.
3、 Collateral
1. The motor current drops.
2. The pressure fluctuated sharply.
3. The flow rate fluctuates abnormally.
4. Make a noise.
5. The pump body vibrates.
6. The pump cylinder temperature increases.

Related products:

Scroll type dry vacuum pump

Application of screw air compressor in chemical industry

 When using screw air compressor in chemical industry, we should not only pay attention to quality, but also ensure its process and production. Chemical industry commonly used to air compressor are: ventilation and mixing, cleaning equipment, combustion

When using screw air compressor in chemical industry, we should not only pay attention to quality, but also ensure its process and production.
In the chemical industry, there are commonly used places for Shou Li Screw Compressors: aeration and mixing, cleaning equipment, combustion gas, transportation, cryogenic use, lifting liquid, vacuum or pressure filtration, spraying, driving volume pump, cleaning pipes through drilling and blowing, pneumatic control, transmission liquid, rubber plant, paint factory, pharmaceutical manufacturing, factory maintenance, plastic plant and so on.
Although the chemical industry gives people a sense of dangerous goods, it is an indispensable industry in our life, especially in countries or regions with advanced manufacturing and technology. Air compressors are also used in the production process of this industry. Because corrosive gas, liquid and dust, a large number of flammable and explosive dangerous substances, as well as irritant, polluting and other toxic substances are often used and produced in the production process, chemical plants are mostly built on water.
In the design of the building structure and production equipment will consider all aspects of anti-corrosion, fire, explosion-proof measures. With the rapid development of science and technology, modern chemical plants mostly use energy-saving, intelligent regulation and centralized control of chemical equipment.
The complex production process of chemical plant cannot do without clean and stable compressed air. The compressed air discharged from the air compressor is transformed into clean and stable gas through a set of post-treatment system of gas storage tank, dryer and filter, and then divided into two pipelines: one is used to drive some pneumatic equipment, and the other is used to produce nitrogen and chemical raw materials
Therefore, a high-quality air compressor and post-treatment system will be directly related to the production process of the whole chemical plant.

Related products:

Water vapor jet vacuum pump for the production of titanium dioxide by sulfuric acid method

 

What are the reasons for the decrease of outlet pressure of horizontal multistage centrifugal pump

 Horizontal multi-stage centrifugal pump is a type of centrifugal pump, there are vertical and horizontal points. Generally used in floor water supply and circulating water, this kind of pump has no suction head, so it can only be installed on the pipe.

The common problem of horizontal multi-stage centrifugal pump is that when the horizontal multi-stage centrifugal pump is selected, the outlet pressure of horizontal multi-stage centrifugal pump can not meet the requirements of use
Analysis of low outlet pressure of horizontal multistage centrifugal pump
1. The reverse phenomenon of horizontal multistage centrifugal pump appears, which is contrary to the design concept; The pump should be stopped immediately and the direction should be adjusted in time.
2. The cavitation phenomenon of horizontal multistage centrifugal pump may be caused by the low suction pressure.
3. The viscosity of the medium is very large, which does not meet the requirements of the horizontal multi-stage centrifugal pump. The medium is not within the allowable range, so the amount of the pump can not meet the requirements of the user.
4. The common reason is that after the pump has been used for a period of time, the impeller of the rotor part inside the pump is excessively worn, so the pump should be overhauled or the impeller should be replaced. Regular maintenance of the pump, can effectively improve the performance of the pump, can also greatly extend the service life of the pump.
Horizontal multi-stage centrifugal pump outlet pressure can not meet the requirements of use, should consider all aspects of the factors for all aspects of inspection.

Related products:

 

Three-blade Roots Blower