How many types of vacuum pumps are there? What are the different types of vacuum pumps?

For micro air pumps and micro vacuum pumps using DC brush motors, the interference problem of the motor is inevitable. Due to the high frequency of conduction and disconnection between the motor brushes and the commutator, a lot of clutter will be generated in the circuit. The amplitude of these clutters is high, usually several times the rated voltage, and the amplitude and frequency vary in a haphazard manner.

These clutters enter the circuit through the power cord that connects to the motor, "polluting" the entire power supply. If this power supply is also used to supply power to the control circuit, many electronic components (such as single-chip microcomputers, LCD screens, etc.) cannot withstand the impact of clutter of these tens of volts (such as 40 90 volts) and work disorderly. Practice has shown that the timing of the customer's instrument failure is random, and the failure phenomenon may be different every time, so the customer often has a difficult time finding the cause.

The low-interference micro pump was developed to solve this problem, and we also design and manufacture the product with interference due to the spatial action of the magnetic field in mind. After years of experiments and customer feedback, it has been found that the interference is mainly caused by the motor polluting the power supply, and there is no phenomenon that our low-interference micro pump interferes with other customer components through the action of space magnetic fields. The clutter amplitude generated by our low-interference micro pumps is below 400 millivolts, which can basically remove more than 99% of the clutter, and no customer has reported that it affects the normal operation of the microcontroller and LCD display over the years.

After measurement, the clutter amplitude of imported products is generally between 200 millivolts and 3 volts due to different manufacturers. Special reminder: A large number of practices have shown that the time when the interference problem causes the customer's instrument to be abnormal is random, comes and goes, and is not easy to detect.

Therefore, it is recommended that when there are the above applications, it is best to choose our low electromagnetic interference models (some series cannot be customized for low interference at present). Resources.

Water ring type, rotary vane type, reciprocating type, etc.

Classification of vacuum pumps:

Classified by working principle:

1. Gas transfer pumps, including variable capacity vacuum pumps and dynamic rolling friend volume transfer pumps;

2. Gas capture pumps, including adsorption pumps, getter pumps, getter ion pumps, and cryogenic pumps.

Classification according to the degree of vacuum:

Dou Beixiao 1, rough vacuum;

2. High vacuum, including slide valve vacuum pump, rotary vane vacuum pump, roots vacuum pump;

3. Ultra-high vacuum.

Summary. What are the types of vacuum pumps? According to the working principle of vacuum pumps, vacuum pumps can basically be divided into two types, namely gas transfer pumps and gas capture pumps.

Gas transfer pumps. The gas transfer pump is a vacuum pump that can continuously inhale and discharge gas to achieve the purpose of pumping. A gas trap pump is a type of gas molecule that allows gas molecules to be adsorbed or condensed on the inner surface of the pump, thereby reducing the number of gas molecules.

According to the structure of the vacuum pump, it can be divided into: reciprocating vacuum pump, rotary vacuum pump and jet vacuum pump. Kiss!

Rotary vane vacuum pumps and diaphragm vacuum pumps.

What are the types of vacuum pumps?

Is there a large negative pressure for vacuum pumps? greater than.

What are the types of vacuum pumps? According to the working principle of vacuum pumps, vacuum pumps can basically be divided into two types, namely gas transfer pumps and gas capture pumps. Gas transfer pumps.

The gas transfer pump is a vacuum pump that can continuously inhale and discharge gas to achieve the purpose of pumping. A gas trap pump is a type of gas molecule that allows gas molecules to be adsorbed or condensed on the inner surface of the pump, thereby reducing the number of gas molecules. According to the structure of the vacuum pump, it can be divided into:

Oil-free vacuum pumps and oil-sealed vacuum pumps. According to the working mode of vacuum pump, it can be divided into: rotary vane vacuum pump and diaphragm vacuum pump.

A vacuum pump is a device that generates, improves and maintains vacuum in an enclosed space in a variety of ways. A vacuum pump can be defined as: a device or equipment that uses mechanical, physical, chemical or physicochemical methods to pump air from the pumped container to obtain a vacuum.

With the development of vacuum applications, there are many types of vacuum pumps, and their pumping speeds range from a few tenths of a liter per second to hundreds of thousands or millions of liters per second. The ultimate pressure (ultimate vacuum) ranges from rough vacuum to very high vacuum above 10-12pa.

According to the experts of imported vacuum pumps from the United States, which are trusted by customers, according to the working principle of vacuum pumps, vacuum pumps can basically be divided into two types, namely variable capacity vacuum pumps and momentum transfer pumps.

Variable volume vacuum pump is a vacuum pump that uses the periodic change of pump chamber volume to complete suction and exhaust to achieve the purpose of pumping. The gas is compressed before exiting the pump chamber.

Momentum transfer pumps (molecular vacuum pumps) rely on high-speed rotating blades or high-speed jets to transfer momentum to gas or gas molecules, so that the gas is continuously transferred from the inlet to the outlet of the pump.

Variable vanity vacuum pumps are divided into: reciprocating type, rotary type (rotary vane type, slide valve type, liquid ring type, roots type, spiral type, claw rotor type) and other types.

Vacuum pumps include reciprocating vacuum pumps, water ring vacuum pumps, and jet vacuum pumps.

1. Reciprocating vacuum pump.

Reciprocating vacuum pumps are suitable for pumping non-corrosive gases that do not contain solid particles.

2. Water ring vacuum pump.

The water ring vacuum pump is a kind of rotary vacuum pump, and the circulating water vacuum pump is used for evaporative distillation, crystallization, filtration, pressure reduction, sublimation and other operations. The cryogenic cooling circulating water vacuum pump is a combination of a vacuum pump and a cryogenic cooling pump. It can be vacuumed, and can provide low-temperature cooling circulating water, which is a good auxiliary equipment for vacuum distillation and vacuum concentration, especially suitable for equipped with rotary evaporator, which not only reduces the use of space, but also reduces the vacuum degree and saves water resources.

3. Jet vacuum pump.

Jet vacuum pumps use a working fluid with a higher pressure rubber pin to convey another fluid. It is a combination of a centrifugal pump and a jet pump (or ejector), which relies on a jetting device to create a vacuum at the nozzle to achieve suction.

Structural features of a vacuum pump

1. The overall structure type of the pump.

The arrangement structure of the pump body of the vacuum pump determines the overall structure of the pump. The intake and exhaust ports of the vertical structure are set horizontally, and the assembly and connection pipelines are more convenient. However, the center of gravity of the pump is high, and the stability is poor at high speed, so this type is mostly used for small pumps.

The inlet port of the horizontal pump is on the top and the exhaust port is on the bottom. Sometimes, in order to facilitate the installation and connection of the vacuum system pipeline, the exhaust port can be connected from the horizontal direction, that is, the inlet and exhaust directions are perpendicular to each other. At this time, the exhaust port can be opened from the left or right direction, except for one end of the exhaust pipe, the other end is blocked or connected to the bypass valve.

This pump has a low center of gravity and good stability at high speeds. Generally, large and medium-sized pumps mostly use this structure.

2. The transmission mode of the pump.

The two rotors of the vacuum pump are operated in relative synchrony by means of a pair of high-precision gears. The drive shaft is connected to the motor by means of a coupling. There are two main types of transmission structure arrangement:

One is that the motor and gear are placed on the same side of the rotor, as shown in the figure. The driven rotor is driven by the motor end gear directly, and the torsional deformation of the active rotor shaft is small, so the gap between the two rotors will not change due to the large torsional deformation of the driving shaft, so that the gap between the rotors is uniform during operation.

The above content refers to Encyclopedia - Vacuum Pump.

Classified according to the working principle and structural characteristics.

1) Mechanical positive displacement vacuum pump.

It is the core positive displacement vacuum pump that relies on mechanical movement to change the working volume of the pump chamber to achieve the pumping effect. This type of pump includes reciprocating vacuum pump and rotary mechanical pump (including rotary vane type, screw type, roots type, liquid ring type, etc.). In addition to mechanical booster pumps, this type of pump can generally be used alone.

2) Jet type vacuum pump.

Jet vacuum pumps are equipped with no mechanical moving parts and are mainly evacuated by a high-speed jet through a nozzle. This type of pump includes water vapor jet pump, air jet pump, water jet pump and various diffusion pumps. This kind of pump has simple structure, reliable operation, long life, easy maintenance, and is widely used.