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Understanding IP private branch exchange (PBX)

Private branch exchanges (PBXs) handle call switching and routing within an organization, and IP PBX systems are the next generation of Internet-based PBX communications.

To provide the cost savings of IP-based phone calls for small companies, But as the organization grows, users will want to look at more sophisticated options, the same as if using a public switched telephone network (PSTN).

Medium- to large-sized businesses have long used private branch exchange (PBX) switchboards to route incoming calls from a number of external lines among a larger number of internal lines. This saves money because there's no need to have a separate line for every employee, and makes line sharing more efficient. Most systems in use today are technically PABX, which means the call routing is automated, rather than dependent on a human switchboard operator.

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Roots vacuum pump unit operating sequence We know that roots vacuum pump needs front stage pump when it is used. Vacuum unit generally includes roots pump water ring pump vacuum unit, roots pump water ring pump large air pump unit, roots pump water ring pump parallel mechanical vacuum pump unit. For the vacuum unit, the operation sequence is more important.1. When there is no bypass valve in the unit, the water ring pump should be started first. The gas in the pumping system enters the water ring pump through roots vacuum pump (the gas drives the rotor of roots pump to rotate itself, just like a flowmeter), and then it is discharged into the atmosphere. When the suction pressure of the water ring pump (or the suction pressure of large and medium air pumps, if there are large and medium air pumps connected in series) reaches the original standard value of roots pump (i.e. allowable working pressure of exhaust pipe), roots pump will start and generator set will be announced to operate and start working.Two When the unit is equipped with a bypass valve, the water ring pump is started first, and then the root vacuum pump is started. At this time, the pressure difference between the root pump and the exhaust gas is large, and the bypass valve is opened automatically. The gas part of the pump enters the water ring pump through the bypass valve, and the other part of the pump enters the water ring pump under the action of the root pump. The air extraction rate is obviously enhanced, so the pre vacuum value of the root pump is quickly reached, and the air pressure difference between the inlet and the exhaust is small, The valve closes automatically (or manually), and the unit works normally. This method can greatly shorten the pre drawing time, but the equipment is more complex.Water Ring Vacuum PumpDry Scroll Vacuum Pumpindustrial vacuum pumps,vacuum furnaces

Heating problem of screw vacuum pump With the development of industry now, we should be very familiar with the screw vacuum pump, because its characteristics are widely used, in order to understand it better, let's understand the heating problem of screw vacuum pump together.Now the screw vacuum pump has excellent corrosion resistance. When using the screw vacuum pump, we will encounter the situation that the inner wall temperature of the reducer is very high two hours after starting. This situation is very unusual for machinery and equipment. Therefore, we should solve it immediately. If the temperature does not drop, please note that the oil window on the screw vacuum pump cannot be used with the plexiglass plate. Lift the low temperature cooler to the vacuum pumping position of screw vacuum pump, and apply cooling water of minus 10 degrees to reduce the temperature.Screw vacuum pump manufacturers remind to reduce the temperature of working fluid in front of screw vacuum pump, measures should be taken to reduce the temperature, less than 20 degrees, in order to achieve better results.Industrial craneRoots BlowersRoots Vacuum Pump

dry vacuum pump operation process What is the operation process of dry vacuum pump? Let's discuss the operation process of dry vacuum pump as follows: After the equipment is running, with the rotation of the motor and the action of the crank connecting rod mechanism, the piston in the cylinder repeatedly makes reciprocating motion. As the piston moves from left to right in the cylinder, the pressure in the left chamber will continue to decrease as the cylinder volume increases. When the pressure in the left chamber is gradually lower than that in the pump chamber, according to the principle of air pressure balance, the gas in the pump chamber is sucked into the left chamber one by one through the suction valve. At this time, the suction valve is in the suction, which completes half of the working process of the vacuum pump.When the piston moves to the right, the left chamber of the cylinder is filled with gas. When the piston moves from right to left, the suction valve of dry vacuum pump will close automatically. As the piston moves from right to left, the gas is slowly compressed. When the steam body in the cylinder reaches the exhaust working pressure, the exhaust valve will open to exhaust and carry out the working circulation system. When the piston moves again from the left end to the right end, the above cycle is repeated until the suction container reaches a relatively balanced pressure.CL Sereis Cone Liquid Ring Vacuum PumpRotary Vane Vacuum PumpDry Scroll Vacuum Pump

Characteristics of reciprocating vacuum pump

Reciprocating vacuum pump it is relying on the piston in the cylinder for reciprocating movement to inhale and discharge gas. Reciprocating vacuum pump has horizontal and vertical two types. But horizontal piston vacuum pump is commonly used. Piston vacuum pump can be divided into single cylinder and double cylinder. The structure of the exhaust valve has slide valve type and free valve type.

Reciprocating vacuum pump features: not afraid of steam, firm, easy to operate. It is mainly used to extract air or other gases from closed containers or reactors. Unless special measures are taken, general reciprocating vacuum pumps are not suitable for removing corrosive gases or gases with particulate ash.

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Sealing reliability and installation requirements of vacuum pump

Under its working pressure, the vacuum pump should be able to discharge all the gas produced in the process of vacuum equipment. Combine the vacuum pump correctly. Due to the selective pumping of vacuum pump, sometimes one kind of pump can not meet the requirement of air extraction. It needs several pumps to combine and supplement each other to meet the requirement of air extraction. If the titanium sublimation pump has a high pumping speed for hydrogen, but can not pump helium, and the tripolar sputtering ion pump (or bipolar asymmetric cathode sputtering ion pump) has a certain pumping speed for argon, the combination of the two will make the vacuum device get better vacuum degree.

Vacuum pump can not work under atmospheric pressure, need pre vacuum, some vacuum pump outlet pressure is lower than atmospheric pressure, need the front stage pump, so all need to combine the pump. Requirements of vacuum equipment for oil pollution. If the equipment is strictly required to be oil-free, all kinds of oil-free pumps should be selected, such as: water ring pump, molecular sieve adsorption pump, sputtering ion pump, low-temperature pump, etc. If the requirements are not strict, you can choose to have an oil pump, plus some anti oil pollution measures, such as adding cold trap, baffle, oil trap, etc., can also meet the requirements of clean vacuum.

The vacuum pump should be installed in a solid place with sufficient space around for inspection, maintenance and maintenance. The foundation level should be kept under the base of vacuum pump. It is suggested to pad damping rubber or install with bolts at four corners of the base to ensure smooth operation and small vibration of vacuum pump.

The connecting pipe between vacuum pump and system shall be sealed reliably. Metal pipeline connection can be used for small vacuum pump, oil resistant rubber shall be used for sealing gasket, and vacuum rubber pipe can be used for small vacuum pump connection. The pipe diameter shall not be less than the suction diameter of vacuum pump, and the pipeline shall be short with few elbows. (the welding slag in the pipe should be removed when welding the pipeline, and it is forbidden to enter the vacuum pump cavity.)

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Notes on balance correction of screw pump Use these expansion coefficients and the difference between the temperature when the pump is calibrated and the temperature when the pump is running to calibrate the centerline height of the shaft. The distance that the machine should be padded up when cooling is the calculated distance shown in the table.The purpose of any shaft alignment is to adjust the centerline of the mechanical shaft to each other, not to adjust the center of the flexible connection. At operating temperature, the correction number (TIR) is within 0 003in of the total indicated reading, including angle and parallelism. Refer to a good calibration process to obtain or guarantee accuracy. Flexible connections can have a large amount of misalignment, which is independent of the alignment between the shafts of the equipment. The purpose of shaft positioning is to extend the service life and service life of the mechanical device, rather than the service life of the joint. If the hot water circulating pump and / or driver are used, the pump will generate enough thermal expansion (possibly LH or more) after operating at rated temperature for a period of time. At this time, the equipment shall be shut down to ensure that the calibration is within the effective limit.Calibration with the pump and drive chain assembled cannot be relied on. Transportation, hoisting, handling and irregular base will make the positioning worse. The final calibration should be done almost at the last step before the pump actually starts. If the pump is installed on site, the positioning inspection shall be carried out after the pump runs stably for several hours or days.Sometimes it is necessary to use elastic frame to reduce the vibration and transfer the vibration to the following foundation. Such an elastic frame cannot be installed next to the pump or driver, but it can be installed between the pump or driver base or bracket and the foundation. The pump and driver must be rigidly positioned, not elastically positioned, because under the action of transmitting torque, the elastically mounted cannot maintain enough accurate positioning.For most equipment, the direction of rotation is very important. Usually indicated by an arrow plate. Remember that there are some drives that rotate in the opposite direction from the input shaft to the output shaft. Most engines and turbines must be purchased in a specific direction of rotation, as do pumps. Standard AC motors are usually bi-directional; their direction of rotation depends on the connection of the power cable. If it is impossible to foresee their rotation direction in advance, it is recommended to make the motor instantly energized (lightly touched and then quickly disconnected) when the flexible connection of the motor shaft is not connected, so as to check whether its rotation direction is correct for other parts of the driving equipment. If not, two of the cables need to be reversed. If necessary, after the reverse connection and before reconnecting the flexible connection, verify that the direction of rotation is correct.Water Ring Vacuum PumpWater Ring Vacuum Pump manufacturersWhat is water ring vacuum pump

Introduction of air-cooled self circulating water ring vacuum pump unit In the process of using water ring vacuum pump, because water is used as working fluid, and working fluid water is continuously injected into the pump, many users do not pay attention to environmental protection when directly working fluid (water) is discharged through the drain outlet of vacuum pump, which makes the waste of water resources and environmental pollution, and even increases the use cost of enterprises. Some users will make water tank for water ring vacuum pump alone or use soda separator at the upper position. The water ring vacuum pump will enter the water pump into the water tank or soda separator, and then it will be sucked into the pump cavity through the self-priming capacity of the pump itself, and then it will be discharged into the water tank to make the reciprocating cycle, but the working process of the water ring vacuum pump will generate heat, such as the invalid power heat of the vacuum pump and the heat of the vacuum pump As a result, the heat of the vacuum pump will be higher and higher in the water temperature of the water tank, and the higher the water temperature of the working fluid, the efficiency of the vacuum pump, many users will add water to the side of the water tank, so it will also lead to waste of water resources and environmental pollution.In view of the above problems, the R & D team of Feiyao company independently developed the air-cooled self circulating water ring vacuum pump unit in combination with the characteristics of the water ring vacuum pump, cooled the circulating working liquid water through air cooling to ensure the water temperature requirements of the water ring vacuum pump, thus ensuring the service life of the water ring vacuum pump and zero discharge of the used working liquid (water).air-cooled roots-liquid ring vacuum system Rotary Vane Vacuum PumpWater Ring Pump