Principles to be followed when using gear oil pump

When using gear oil pump, we will encounter many faults, and the causes of these faults are also different. According to the troubleshooting methods of gear oil pump production over the years:
(1) Add or change the required engine oil at the specified oil level in season. Take out the foreign matters in the oil pipe and tighten the bolts or nuts at the joint
(2) Replace the aged or damaged skeleton oil seal or "O" seal rubber ring;
(3) Replace the worn gear oil pump or oil pump shaft sleeve. When the wear is slight, grind the end face flat on the plate. The allowable error of unevenness is 0.03mm; The end face of the upper shaft sleeve is lower than the upper plane of the pump body (the normal value is lower than 2.5 ~ 2.6mm). If it is poor, the lower shaft sleeve shall be added with 0.1 ~ 0.2mm copper sheet to compensate. During installation, it shall be installed on the rear shaft sleeve;
(4) Only when the unloading plate and sealing ring are installed into the oil chamber can the two shaft sleeves maintain balance. The sealing ring of unloading plate shall have 0.5mm preload;
(5) The elastic force of the guide steel wire shall be able to twist the upper and lower shaft sleeves by a small angle towards the rotation direction of the driven gear at the same time, so as to make the processing planes of the two shaft sleeves of the driving and driven gears closely fit;
(6) The unloading groove on the shaft sleeve is installed on one side of the low-pressure cavity to eliminate the harmful dead volume during gear meshing;
(7) Before pressing in the self tightening oil seal, apply a layer of lubricating oil on its surface, and pay attention to the oil blocking edge towards the front cover, which cannot be installed reversely;
(8) The "right-hand" pump cannot be installed on the "left-hand" machine, otherwise the skeleton oil seal will be damaged;
(9) Pour a small amount of engine oil into the pump housing and install it into the pump housing by hand;
(10) Before installing the oil pump cover and tightening the bolts, check whether the distance between the pump cover and the pump body is between 0.3 ~ 0.6mm. If it is too small, replace the sealing ring and pressure relief part. After the hydraulic oil pump is installed, it shall rotate flexibly without jamming.
This is the principle we follow when using gear oil pump.、

What if the shaft sleeve of screw vacuum pump is locked?

What are the characteristics of wear-resistant multistage centrifugal pump

Design principle of wear-resistant multistage centrifugal pump: the existing multistage centrifugal pump generally adopts the unitary theory design for conveying clean water. For the multistage centrifugal pump used in coal mine, our company adds the design theory of two-phase flow to increase the suction performance and hydraulic design of the pump, which increases the suction head of the pump and reduces the impact wear of coal and water in the pump, It can convert energy, so as to increase the efficiency of the pump and increase the service life of the pump.
The wear-resistant multistage centrifugal pump is a segmented horizontal multistage pump, the suction port is horizontal and the discharge port is vertical upward. The water pump is directly driven by the prime mover through the coupling. Viewed from the end of the prime mover, the pump rotates clockwise and is mainly composed of stator, rotor, bearing and shaft seal:
1. The stator part is mainly composed of suction section, middle section, discharge section, guide vane, etc. each section is clamped with tensioning bolts to form a working chamber.
2. The rotor part is mainly composed of shaft, impeller, balance disc and shaft sleeve. The shaft transmits power to the impeller to make it work; The balance disc is used to balance the axial force; Both ends of the shaft are equipped with replaceable shaft sleeves to protect the shaft.
3. There are two kinds of bearings: rolling bearing and sliding bearing: rolling bearing is mainly composed of bearing body, bearing and bearing gland, which is lubricated with grease. The sliding bearing is mainly composed of bearing body, bearing cover, bearing bush, dust disc, oil level gauge, oil slinger, etc. it is lubricated with thin oil.
4. The shaft seal adopts packing seal, which is mainly composed of the water inlet section and the sealing box body on the packing box body, packing and water retaining ring. Seal the liquid in the working room and play the role of water seal, water cooling and water lubrication.

Liquid ring pump vacuum pump in power industry applications 

Heat preservation pump high viscosity heat preservation pump

1. Title: insulation pump high viscosity insulation pump NYP insulation pump delivery notice
2. Key words: magnetic insulation pump no leakage insulation pump insulation pump manufacturer magnetic drive gear pump asphalt insulation pump
3. Mode of transportation: the whole machine is packed in wooden cases and has been delivered through deppon logistics. The order number has been sent to the customer's mobile phone. Please check it at any time.
4. Remarks:
NYP high viscosity heat preservation pump is composed of inner and outer rotors, shafts, pump bodies, front covers, brackets, seals, bearings, etc. The sealing mode of the heat preservation pump has two forms: mechanical seal and packing seal. If it is a medium with high temperature, high viscosity and strong corrosivity, packing seal can be selected. When the heat preservation pump transports easily crystallized materials, a heat preservation jacket can be designed on the front cover and the pump body, which can be insulated and melted by steam during operation. It rotates clockwise when viewed from the extended end of the main shaft to the pump.
The heat preservation pump is especially suitable for the transportation of high viscosity media. NYP high viscosity heat preservation pump can be used to transport heavy oil, asphalt, glue, resin, detergent and other objects

vacuum pump unit of anti corrosion method 

I hope you can understand the three taboos of using submersible pump

Any equipment has a service life. The length of service life is not only related to the quality and performance of the equipment itself, but also related to people's use specifications. If we do not use the equipment according to the conventional requirements, the service life of the equipment will be shortened. Today, Xiaobian will introduce you to the three taboos of submersible pump. I hope all readers in front of the screen can cheer up and have a good understanding of this content.
Do not rotate in the opposite direction
Submersible pumps are divided into single-stage pumps and multi-stage pumps. According to common sense, the single-stage pump with lower head and the multi-stage pump with higher head. In the process of using single-stage pump, it is recommended to distinguish the direction. Although the submersible pump can discharge water whether it is positive or negative, it is recommended that you turn forward rather than reverse. In case of reverse rotation, the motor winding may be damaged. And to be honest, when the single-stage pump of submersible pump is in the reverse state, the water output is still relatively small, so it is better to turn forward. In addition, a warm reminder. I hope you can check carefully before pumping the single-stage submersible pump into the water to see if the rotation direction of the single-stage submersible pump is abnormal. If it is abnormal, it should be adjusted in time. After it is normal, it can be put into the water.
Do not overload operation
Whether it is people or equipment, as long as they work overload, it will cause certain damage to themselves, and so will the stainless steel submersible pump. Xiaobian told you above that the head of single-stage submersible pump is generally small, so for those work fields that need high head submersible pump, single-stage submersible pump can not be used. If you have to use a single-stage submersible pump, you should pay attention to it in the process of use, so as to prevent the current value from exceeding the normal range and burning the equipment.
High frequency start
You know what? When the single-stage pump of the submersible pump is closed, the submersible pump will produce backflow. At this time, if you press the start button to make the submersible pump work, it may cause damage to the motor and make the motor load start. After the motor load starts, the starting current will become large. To a certain extent, it will inevitably cause various problems in the equipment. At the same time, shorten the service life of the equipment. Therefore, when using submersible pumps, we must not make taboos in this regard. According to common sense, if you want to start the submersible pump and single-stage pump again, it should be at least five minutes apart.

2BE3-300 liquid ring vacuum pump introduction 

The technical requirements of self-priming pump before installation are very critical

The self-priming pump absorbs water by generating a low-pressure area in the self-priming pump due to the high-speed rotation of the impeller. Therefore, the self-priming pump must ensure that its water inlet pipe does not leak, that is, to ensure that the external air cannot enter the water inlet pipe. Otherwise, it will not only affect the efficiency of the water pump, but also produce serious vibration and noise during the operation of the water pump.
The technical requirements of self-priming pump before installation are very critical:
1. Before installing the self-priming pump, it must be confirmed that the length and height of the inlet pipeline cannot exceed the allowable suction range of the self-priming pump.
2. The inlet pipeline must not have air leakage. It should be fully sealed. Even if there are small holes with large needle holes, it will affect the self-priming capacity of the self-priming pump.
3. The self-priming pump cannot be installed cheaply. When some users take the newly purchased self-priming pump for use, they directly put the wooden strip base of the factory fixed self-priming pump and the self-priming pump on the ground for use. This method is not desirable, which can easily lead to vibration and noise of the self-priming pump and mechanical failure of the self-priming pump. The correct method is to fix the pump base on a solid flat platform or hard ground.
4. When installing the self-priming pump, try not to fix it on the bracket welded with channel steel, because there are too few contact surfaces between the channel steel and the pump. While tightening the base screws, a large part of the pump base is suspended, so it is easy to damage the concentricity of the base and coupling. Therefore, the self-priming pump installed on the channel steel bracket is prone to large vibration and the coupling is easy to be damaged.
In case of insufficient or no water output from the water pump during work, first consider whether there is air entering the water inlet pipe due to sand holes, cracks or loose joints, and observe it to find out the air inlet. Some defects are so subtle that it is difficult to find them directly with the naked eye. They are often laborious and time-consuming without results.

SV rotary vane pump oil Introduction 

Characteristics of spiral centrifugal pump

A key part of the spiral centrifugal pump is its unique spiral centrifugal impeller, which has both spiral section and centrifugal section. It combines the advantages of non clogging of the spiral pump of the traditional centrifugal pump, so it is called spiral centrifugal pump. The spiral centrifugal pump originated in Switzerland and is designed to help Peruvian fishing plants transport live fish from fishing boats. Relying on the non blocking and soft transportation characteristics of the spiral centrifugal impeller, the pump can transport live fish from the fishing net to the ship and then from the ship to the processing plant intact. With the increasing development and improvement of products, the application field of spiral centrifugal pump is gradually expanded. Compared with ordinary impurity pump and swirl pump, the structure of spiral centrifugal pump determines that it has the following characteristics:
1) No blockage, good performance
The large channel formed by the blade, coupled with the role of inlet guidance and spiral propulsion, can transport the liquid containing large particles and fiber materials, especially the long fiber objects can pass smoothly. The solid concentration transported is higher than that of other types of non clogging pumps. Compared with the traditional centrifugal impeller with similar outer diameter, the diameter can be greatly improved.
2) Soft conveying and good non-destructive performance
The solid-liquid two-phase fluid is gradually pushed forward under the action of balanced helical force, and there is no sudden change in the flow direction, so the flow is balanced. In the sludge treatment process, it is suitable for conveying sludge and can maintain the characteristics of sludge.
Screw centrifugal pump
3) High efficiency and wide area
4) Flat power curve
5) Characteristic curve with steep drop
When the head changes, the flow changes little, which can ensure continuous and stable operation.
6) The suction performance of the pump is good
The pump blade extends forward to the suction port, so it can pump the gas containing medium. When a trace of gas is inhaled, the performance, vibration and noise of the pump basically do not change. When the gas content exceeds 40%, the pump can still operate despite intermittent vibration.
7) High solid content

Magnetic Drive Roots Pump 

Centrifugal pump commissioning method and precautions

Centrifugal pump test method and precautions for centrifugal pump test
The installation of centrifugal pump should be completed in advance according to the following items when the centrifugal pump and centrifugal pump are installed
1. Before starting the centrifugal pump, it is forbidden to run the pump with no-load and no-load. The test run with liquid shall be carried out according to the operating procedures specified above in the operating instructions of the centrifugal pump. For the forced lubrication system, the temperature rise of the bearing oil of the centrifugal pump shall not exceed 28 ° C and the temperature of the bearing metal shall be less than 93 ° C.
2. For centrifugal pumps with oil ring lubrication or splash lubrication system, the temperature of lubricating oil shall not exceed 39 degrees, and the temperature of bearing parts shall be less than 82 degrees.
3. When testing the centrifugal pump, the vibration value of the bearing of the centrifugal pump should also be checked. The vibration standard of the bearing of the centrifugal pump can refer to the vibration standard of relevant Petrochemical rotating machinery.
4. During the test run of the centrifugal pump, the operation of the centrifugal pump should be very balanced and noise free, the coolant and lubricating oil system should be normal, and the centrifugal pump and auxiliary pipelines should be free of leakage.
5. During the commissioning of the centrifugal pump, it should be noted whether the current of the centrifugal pump motor operates within the specified range. If the overcurrent indicates that the actual working condition head is lower than the pump head, it is recommended to turn down the outlet valve to control the flow of the centrifugal pump so that its current can be used within the rated current range.
6. The leakage of various seals and media of centrifugal pump shall not exceed the requirements of the following standards:
(1) Clean water centrifugal pump with mechanical seal: light oil 10 drops / min, heavy oil 5 drops / min
(2) Multistage centrifugal pump with packing seal: light oil 20 drops / min, heavy oil 10 drops / min
(3) For the magnetic drive pump conveying toxic, harmful, flammable and explosive media, no obvious leakage is allowed.

dry screw vacuum pump of rotor profile type

What common problems should be paid attention to in the selection of sewage pump?

What are the common problems of sewage pump selection? The blowdown pump is a kind of pump which is connected with the motor and intrudes into the underwater work together. Compared with the usual vertical pump or vertical sewage pump, the blowdown pump has compact structure and small total area. Convenient installation and maintenance. Large and medium-sized sewage pumps are usually equipped with automatic coupling equipment, which can carry out automatic installation. Installation and maintenance are equivalent to convenience. Long running time.
Because the pump and motor are coaxial, the shaft is short and the rotating component is very light, the load (axial) borne on the bearing depends on the small, and the service life of the sewage pump is much longer than that of the usual pump. There are no problems such as cavitation damage and water filling. The latter ones are very convenient for the use staff. Low vibration noise, low motor leakage current, green environmental protection for the bad environment.
Type selection FAQ 1. Find out the bad environment of pump application and select the appropriate type of pump (usually wet test and dry test).
2. Calculate the required water pressure of the pump. Occasionally, customers calculate the flat transportation distance as the water pressure, which is incorrect. After the flat transportation distance is multiplied by the friction resistance, it can be calculated into the water pressure.
3. The damage of pipe bends and pipeline friction must be measured. In fact, this is all different. It is inconvenient to measure. Therefore, it is proposed to leave some space to ensure that the pump can get water.
4. If you choose a stainless steel sewage pump, you should also find out the pH value of the water body, including particle diameter, and choose a suitable metal material. Generally, 304 material is suitable for pH4 ~ 10. Beyond this scope, 316 or 316L stainless steel is proposed.
5. The pumping machine must be applied within the rated water pressure range to ensure that the motor has only load. For example, the specific required water pressure is 30m, but the pump with the standard water pressure less than 30m should be used for pumping. This situation should be an incorrect instruction, which will lead to the load of the motor. In serious cases, the motor will be burned.
6. The pump pipeline must be connected. If the pipeline is blocked, it will lead to motor load, and the motor can be burned under serious conditions.

Why is the dry screw vacuum pump more in line with the production requirements of energy conservation and environmental protection 

Several precautions for installing stainless steel self-priming pump should be kept in mind!

The stainless steel self-priming pump has made more changes in function and material in order to discharge gas more smoothly in the self-priming process, and it is also easy to connect the exhaust pipe or valve. However, special attention should be paid during installation to ensure that there will be no instability during operation.
1. Pay attention to stability
In order to ensure that the service life of the pump is increased when it is directly connected with the motor. Therefore, when installing and correcting, you must ensure that the installation of the whole pump is stable, including its pump shaft and motor output, which should be on the same shaft degree.
2. Firmly installed
When the stainless steel self-priming pump is running, the power is very strong. In order to ensure that the equipment can be used stably, it must be firm between various lock nuts during installation, so as to avoid mechanical failure caused by impeller movement.
3. Storage solution left
Although this kind of machine pump does not need to be filled with water, in order to avoid the occurrence of dry friction inside the machine, we must ensure that a certain amount of stored liquid is stored in the pump body.
4. Pipeline installation
In order to ensure that this kind of pump can complete a good self-priming process, the maximum height of its suction inlet must not exceed 5m. At the same time, the suction port must be used with the support, so as to reduce the load borne by the pipeline. Of course, there must be no solid sundries in the pipeline, and the filter surface should be checked regularly.
5. The axial deviation shall be controlled within 0.1mm
When installing between the shaft device and the shaft device, the maximum deviation of its shaft degree must be controlled, otherwise once the height difference deviates too much, it will lead to instability during the operation of the self-priming pump.

water ring vacuum pump unit of usage of working fluid

The sewage pump with mixing is very noisy

The sewage pump with mixing device is mostly used to suck sewage pits with more particles, such as slurry water in industrial production and urban underground sewage pits. The mixing device can float and discharge the precipitated foreign matters. Compared with the traditional sewage pump, it has higher treatment efficiency and medium overcurrent. However, recently, some customers have reported that the sewage pump with mixing device is very noisy, EVP pump industry provides relevant solutions.
The automatic mixing sewage pump is a submersible sewage pump. Although the mechanical operation itself will produce a certain amount of noise, because the operation is carried out under the liquid and the noise cannot be transmitted to the ground too much, the noise perceived by human beings should be limited. If the noise is unbearable in the actual process of using the pump, it is recommended to put forward the pump and carry out the following maintenance and treatment.
1. First check the pipeline system, mainly to ensure that the pipeline has a separate support frame, and all connections are fastened without looseness. If necessary, install damping devices to alleviate the noise caused by vibration;
2. Confirm the historical maintenance records of the sewage pump and check whether anyone has changed the factory structure and configuration components of the pump. Some users will modify the pipe size of the sewage pump to make the flow meet the transportation standards. This behavior will lead to the imbalance of water absorption and output, resulting in severe noise and shaking. If it is really necessary to change the configuration and internal structure of the sewage pump under special transportation conditions, it is recommended to contact the manufacturer and arrange professional technicians to implement it;
3. In addition to the behavior of modifying the pump structure by themselves, some users also replace the supporting motors of the original factory. Some newly replaced motors may have poor performance or mismatch with the pump power, resulting in unstable current during operation, pulse and noise.
The above content briefly introduces the relevant reasons and treatment measures for the high noise of the sewage pump with mixing. Such matters can be avoided in the actual process of using the pump, which only requires the operator to pay more attention. If you want to know more pump information such as screw pump and multi-stage pump, you are welcome to continue to pay attention to EVP pump industry.

How to find the vibration source of vacuum pump unit 

Benefits of using diaphragm pumps

The advantage of using diaphragm pump is that it is easy to install and use, and there is no need to monitor the operating parameters at all times. It can operate without fault for a long time, and there is no excessive vibration and noise interference in the process of use. It is a reliable new type of high-performance pump. Because of its wide versatility, it can have good adaptability even if the working conditions change. It is a high cost-effective transportation pump.
Diaphragm pump is a new type of pump, which overcomes many shortcomings of traditional water pump. For the benefits of using diaphragm pump, please refer to the following points.
1. It can be used away from the motor. There are no potential safety hazards such as electric leakage in flammable and explosive fields. It is easy to carry and can be used in various remote areas;
2. Idling for a long time does not generate heat and does no damage to the pump. There is no need to arrange special personnel to monitor. Due to the light volume, the vibration during operation is also very slight;
3. With reliable comprehensive performance, it can dive, self absorb, prevent leakage, transport chemical liquid, and transport viscous liquid like screw pump;
4. The installation of pneumatic diaphragm pump does not need foundation and does not occupy too much space. If necessary, it can be directly immersed in liquid for use;
5. High safety, no crash, overclocking or overload caused by overload operation, self-protection function, simple and convenient operation in daily use;
6. It can be customized. EVP pump's pneumatic diaphragm pump products support a variety of pump materials such as engineering plastics, stainless steel, cast iron and alloy for different transportation conditions;
7. The internal structure of the pneumatic diaphragm pump has been optimized and can be used for a long time without worrying about wear. However, the diaphragm is a consumable and it is recommended to check it regularly.
After understanding the benefits of using diaphragm pump, it should be noted that pneumatic diaphragm pump is limited by air source pressure, and the pump pressure of most models and specifications can only reach 6bar. If there is higher demand for flow, pressure and other parameters, electric diaphragm pump can be considered. If you have special transportation needs, you can also contact EVP pump industry in advance to customize the pump body.

Water Ring Vacuum Pump Unit of Cavitation Analysis