Disassembly steps of 2BV vacuum pump impeller

Disassembly steps of 2BV vacuum pump impeller

The application of 2BV vacuum pump is more and more extensive. In order to make the equipment use for a longer time and keep the operation efficiency unchanged, we need to check it in the use process. When checking 2BV vacuum pump, sometimes we need to dismantle the impeller, check or replace the blade. Let's learn how to deal with it.

1. There is a screw hole on both sides of the impeller center hole of 2BV vacuum pump. Make a tool. Drill and tap in the middle of a thick iron plate. The size is smaller than that of the motor shaft. Each end of the hole is milled with a through slot.

2. After fixing the impeller with two screw holes on the bolt impeller, use a large bolt to rotate and tighten the motor shaft of 2BV vacuum pump. Rotate this bolt against the motor shaft, and the impeller will come out slowly. If it is too tight to come out, you can bake the impeller with fire to make it expand and take out the impeller.

When carrying out maintenance, we must pay attention to the correct steps to prevent the imagination that we can't install the parts after they are disassembled. In addition, some important parts should not be disassembled without authorization. It is recommended to find a professional to disassemble them.

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dry vacuum pump structure

dry vacuum pump structure

Below by the dry vacuum pump manufacturers to introduce the dry vacuum pump structure is how the dry vacuum pump is made according to the task principle of screw compressor. On the market, there are two main types of its structure, mainly screw type and moment type. For details, I will introduce the structure of dry vacuum pump.

In the screw compressor, the number of turns of the rotor is within one turn, while that of the screw vacuum pump is more than two turns, which can increase the return flow and improve the compression ratio. The single-stage pump can pump from atmospheric pressure to the limit pressure of 1pA, and the pumping speed is 60-120m3 / H.

A pair of right and left rotors with rectangular cross section mesh, driven by synchronous gear to complete non-contact high-speed operation, gas enters from the upper side, condenses in the pump cavity, sweeps from the lower end of the rotor, and the rotor rotates once to exhaust. The rotor and the outer surface of the pump body form a sealing structure. There is less leakage in the rectangular section clearance, so a higher compression ratio can be lost. The compression ratio and pumping speed of the pump are related to the leading angle of the rotor, the meshing rate of the clearance between the rotor and the pump body, the number of turns, the diameter of the rotor and the rotation speed. Because of its large number of turns, higher compression ratio than the screw type mentioned above, and low pumping speed, the pump can be pumped from atmospheric pressure to the limit pressure of 10-1pa, and the pump with pumping speed of 40-80m3 / h is commercially available.

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Start stop sequence of Roots vacuum pump

Start stop sequence of Roots vacuum pump

Roots vacuum pumps are usually used with the front pump. In use, especially in the process of start and stop, it should be noted that the process is different from simple single pump, and the sequence is strict. Interruption may cause damage to the device unit. Therefore, let's see what the roots vacuum pump starts in the process of use.

Let's start with the startup program. In addition to multistage, wet and air-cooled Roots vacuum pumps, conventional roots vacuum pumps need to be combined with the front pump to avoid equipment damage due to excessive pressure difference. So before starting the roots vacuum pump:

(1) Start the front pump; 2) open the valve on the pipeline of the front pump and the intake and exhaust valve of Roots vacuum pump;

When the system pressure reaches the allowable inlet pressure of Roots vacuum pump (the allowable inlet pressure of Roots vacuum pump from different manufacturers is different), close the valve on the pre pumping pipeline and restart the roots vacuum pump. In the absence of the above-mentioned pre pumping pipeline, the front pump can start the roots vacuum pump after pumping the allowable inlet pressure of the roots vacuum pump.

Roots vacuum pump must be used in strict accordance with the technical specifications. Generally speaking, the inlet pressure of Roots vacuum pump is below 1330 PA, and the pumping efficiency is good (the maximum pumping efficiency should be in the range of 100-1 PA). In application, the maximum inlet pressure shall not exceed the maximum allowable inlet pressure, nor shall it be suitable for operation under high inlet pressure for too long. In addition, under normal operation, the maximum temperature of the general pump shall not exceed 40 ℃, and the maximum temperature shall not exceed 80 ℃, which depends on the specific characteristics of the manufacturer's products. There shall be no irregular abnormal vibration and noise during operation. In case of motor overload, high temperature rise, abnormal noise and large vibration during operation, stop the machine immediately to check the cause and remove the fault.

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Correct use of 2SK water ring vacuum pump

Correct use of 2SK water ring vacuum pump

Before 2SK water ring vacuum pump, it is necessary to check whether the rotation direction of the motor is consistent with that of the pump. After starting the vacuum pump, adjust the size of the water inlet, and then check whether the packing pressure is appropriate (normal packing pressure will make the water drop in the pump leak out). Sk-1.5b should first add water, then start the vacuum pump, and then adjust the size of the water inlet. The bearing lubrication is normal.

 

After 2SK water ring vacuum pump is started, it is necessary to observe whether there is vibration, listen carefully to whether there is noise in SK cantilever water ring vacuum pump, and measure the temperature of stuffing box and bearing (the normal bearing temperature shall not be 35 ℃ higher than the ambient temperature, and the working temperature shall not be higher than 70 ℃). If the temperature is too high, park the vehicle immediately to check the cause.

When SK cantilever water ring vacuum pump is used as the vacuum water diversion of the pump, during the operation of the pump, all air in the pump is sucked out until the water is sucked out to sk cantilever water ring vacuum pump in the future, that is, start the pump, stop the vacuum pump after the pump works normally, and seal the suction valve.

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water ring vacuum pump routine maintenance

water ring vacuum pump routine maintenance

The service life of the water ring vacuum pump is not only related to the quality of the pump itself, but also to its daily management. Therefore, it is necessary to manage and maintain the water ring pump regularly. So, what is the daily management of water ring vacuum pump?

1. Regular cleaning and oil change: kerosene or straight run gasoline shall be used to clean the water ring vacuum pump. After cleaning, all parts shall be dried, dried in the air or blown by a blower. When changing oil, 100 × or 1 × clean vacuum pump oil shall be selected. If other oil is used instead, the vacuum degree of the pump will be seriously affected.

2. Before starting the pump, check whether the rotation direction of the motor is correct, whether the lubrication system is reliable and whether the oil volume is appropriate.

3. During daily operation, ensure that the oil temperature is not more than 75 ℃, and there is not too much noise and vibration, otherwise, shut down for maintenance.

4. The connecting pipeline between the pump and the user system shall be mainly short and thick, and elbows shall be minimized. If there are elbows, all joints shall be strictly sealed to ensure no air leakage.

5. When stopping the pump, first close the valve connecting the vacuum system and open the vent valve to prevent the pump oil from being sucked back into the vacuum system, and then cut off the power supply of the motor.

The long-term and efficient use of water ring vacuum pump is inseparable from our careful management and maintenance. When we use water ring vacuum pump everyday, we should do the above points well, so that the pump can be efficiently used in industrial production.

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Influence of water temperature on water ring vacuum pump

Influence of water temperature on water ring vacuum pump

Water ring vacuum pump is a type of vacuum pump that we can often use. We all know that its service performance is very good, but it does not rule out accidents. After a period of use, it is easy to have some unexpected problems. There are many factors that affect the normal operation of the vacuum pump, so the water temperature is one of them, whether the water temperature is too high or too low, it will have a certain impact on the operation of the vacuum pump. So, why on earth is this? Now let's have a detailed understanding of the reasons.

1. Too high water temperature will make the water evaporate, and the negative pressure condition will further aggravate the occurrence of this kind of vaporization and evaporation, making the pump body produce too much water vapor. In this way, when the water ring vacuum pump inhales too much water vapor, but seldom inhales outside, resulting in a very low vacuum degree of the system. There are two main reasons for the high water temperature, one is that the water supply temperature is too high, the other is that the water temperature rises in the working process.

2. Because the water temperature is related to the suction capacity, the working fluid temperature is high, and the air volume will decrease. With the increase of temperature, the evaporation capacity increases, occupying the original displacement, and the suction capacity decreases, which will prolong the vacuumizing time. In addition, under the vacuum condition, the evaporation capacity of the sealing liquid will increase with the increase of temperature, and the larger the percentage of the displacement, the situation that cannot be vacuumized will occur. As for the data involved too much, the evaporation capacity of sealing liquid under various vacuum degrees and the evaporation capacity under various temperatures are not the same, so it is impossible to give specific data. Only under certain vacuum degrees can the temperature change be reflected and the evaporation capacity change be caused. In use, it must be combined with temperature, and the superposition of two performance curves of vacuum degree and pump performance curve can be seen.

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water ring vacuum pump structure description

water ring vacuum pump structure description

The use of water ring vacuum pump is quite common, especially before use, we need to have a general understanding of its mechanism, because only when we understand the structure of the equipment, can we operate more easily in the future. So, in order to let you know more about the device, let's introduce the structure of the device:

Structure description: water ring vacuum pump is composed of pump body, front and rear end cover, impeller, shaft and other parts. And parts and components are complementary, one less vacuum pump will be paralyzed, so let's take a look at the detailed structure of the vacuum pump.

The intake pipe and exhaust pipe are connected with the pump cavity through the suction hole and exhaust hole installed on the disc on the end cover. The impeller of the water ring vacuum pump is fixed on the shaft with a key and installed eccentrically in the pump body. The total clearance at both ends of the pump is adjusted by the gasket between the pump body and the disc. The clearance between the impeller and the front and rear discs is adjusted by the impeller driven by the shaft sleeve. The clearance at both ends is guaranteed to be uniform. The shaft and impeller are interference fit, and the clearance is determined by the front end positioning. The gap between the two end faces of impeller and the front and rear discs determines the loss of gas and its pressure in the flow from the air inlet to the exhaust port.

The packing of the water ring vacuum pump is installed in the two end covers. The sealing water enters the packing through the small hole in the end cover to cool the packing and enhance the sealing effect. The make-up water required for impeller to form water ring is supplied by water supply pipe, which can also be connected with steam water separator for circulating water supply. If the mechanical seal is adopted, the mechanical seal is installed in the packing cavity without packing. The packing gland is replaced by the mechanical seal gland, and the other structures are the same.

The bearing of water ring vacuum pump is fixed on the shaft by a round nut. A disc is arranged on the end cover, and the disc is provided with suction and exhaust holes and rubber ball valves. The function of rubber ball valve is that when the gas pressure between impeller blades reaches the exhaust pressure, the gas will be discharged before the exhaust port, feeding the power consumed due to the excessive gas pressure and reducing the power consumption.

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