Reciprocating vacuum pump

Reciprocating vacuum pump (abbreviated as reciprocating pump) also known as piston vacuum pump, belongs to one of the low vacuum acquisition equipment. Compared with the rotary vane vacuum pump, it can be made into a large pumping speed pump; compared with the water ring vacuum pump, the efficiency is slightly higher. The main disadvantages of such pumps are complex structure, large volume and large vibration during operation. It can be replaced by liquid ring vacuum pump on many occasions.

The structure and working principle of the reciprocating pump are shown in the figure. The main components are cylinder 1 and piston 2 in which reciprocating linear motion is performed. The driving of the piston is accomplished by crank connecting rod mechanism 3 (including cross head). In addition to the above main components, there are exhaust valve 4 and suction valve 5 and other important components, as well as the frame, crankcase, dynamic seal and static seal and other auxiliary components.Vacuum Pump


When running, driven by the motor, the piston in the cylinder can reciprocate through the action of the crank and connecting rod mechanism. When the piston moves from the left end to the right end of the cylinder, the density of the gas in the cylinder decreases with the increase of the volume of the left chamber of the cylinder, thus forming the pumping process. At this time, the gas in the pumped container enters the left chamber of the pump body through the suction valve 5. When the piston reaches the most right position, the left chamber of the cylinder is completely filled with gas. Then the piston moves from the right side to the left side, when the suction valve 5 is closed. The gas in the cylinder is gradually compressed as the piston moves from right to left. When the pressure in the cylinder reaches or slightly exceeds one atmospheric pressure, the exhaust valve 4 is opened and the gas is discharged into the atmosphere to complete a working cycle. When the piston moves left to right again, it repeats the previous cycle, so repeats, and eventually reaches a stable equilibrium pressure in the pumped vessel.

Application of vacuum pump in sugar industry

Working principle of rotary vane vacuum pump

Rotary vane vacuum pump (rotary vane pump) is an oil sealed mechanical vacuum pump. Its working pressure range is 101325~1.33 * 10-2 (Pa), which belongs to the low vacuum pump. It can be used alone or as a front pump for other high vacuum pumps or ultra high vacuum pumps. It has been widely used in metallurgy, machinery, military industry, electronics, chemical industry, light industry, petroleum and pharmaceutical production and scientific research departments.

Rotary vane pump can extract the dry gas from the sealed container. If it is equipped with a gas-holding device, it can also extract a certain amount of condensable gas. But it is not suitable for the extraction of oxygen-rich, corrosive to metals, chemical reactions to pump oil, and gas containing particulate dust.2XZ direct drive rotary vane vacuum pump


Rotary vane pump is one of the most basic vacuum equipment in vacuum technology. Rotary vane pumps are mostly small and medium sized pumps. Rotary pump has two kinds: single stage and double stage. The so-called two-stage structure is to connect two single stage pumps in series. It is usually made in two stages to achieve higher vacuum.

vacuum pump is applied in vacuum packaging machine

Working principle of water ring vacuum pump

Water ring vacuum pump is a kind of coarse vacuum pump. The limit vacuum it can obtain is 2000-4000Pa, and the series air ejector can reach 270-670Pa. Water ring pump can also be used as compressor, called water ring compressor, is a low-pressure compressor, its pressure range is 1 ~ 2 *105Pa meter pressure.application field of vacuum technology

Water ring pumps were initially used as self-suction pumps, and then gradually used in petroleum, chemical, machinery, mining, light industry, medicine and food and many other industrial sectors. In many industrial processes, such as vacuum filtration, vacuum water diversion, vacuum feeding, vacuum evaporation, vacuum concentration, vacuum moisture regain and vacuum degassing, water ring pump has been widely used. Due to the rapid development of vacuum application technology, water ring pump has been paid much attention in obtaining coarse vacuum. Because the gas compression in the water ring pump is isothermal, it can extract flammable and explosive gases, in addition, it can also extract dust, water-bearing gases, so the application of water ring pump is increasing.

2BV series Liquid ring vacuum pump

SMALL TURBINE MOLECULAR PUMP

Turbomolecular pump is a kind of high vacuum acquisition equipment, which is used to provide a clean high vacuum environment. It has been widely used in electronic industry, optical engineering, surface science and other fields. Small turbomolecular pumps, with their advantages of small size, light weight and low power consumption, are often used in equipment or instruments that require vacuum without emphasis on pumping speed, such as vacuum acquisition equipment as mass spectrometer and leak detector.

Turbine molecular pump takes impeller group as its pumping actuator. The impeller group consists of alternately arranged dynamic and static impellers. When the impeller rotates at high speed, its speed is close to the molecular thermal speed, while the static impeller remains stationary.

How To Prevent The Control Valve From Getting Stuck Or Blocked

Cleaning method:

The most common fault: the welding slag, rust, slag, etc. in the pipeline cause blockage or jam in the throttle hole, the guiding part, and the balance hole of the lower bonnet, causing strain and scratches on the curved surface of the valve core, the guide surface, and sealing. Indentations and the like are formed on the surface. This often happens in the early stages of the new commissioning system and after the overhaul.

In this case, it must be unloaded for cleaning, remove the slag, if the sealing surface is damaged, it should be ground; at the same time, the bottom plug is opened to wash off the slag falling into the lower bonnet from the balance hole, and rinsing the pipeline. Before commissioning, let the regulating valve open completely, and making the medium flow some time before the normal operation.

Double Stage Piston Vacuum Pump

The two-stage piston vacuum pump series is suitable for suction of air and other general gases. When using air ballast, the pump can suck a small amount of condensable gases (such as water vapor). Additional devices should be used when pumping gases with excessive oxygen content, explosive, corrosive to ferrous metals, and chemical reaction to vacuum oil. This type of pump can be used alone or as a pre pump for diffuser pumps, roots pumps and other high vacuum pumps. The pump is widely used in vacuum coating, vacuum heat treatment, vacuum impregnation, vacuum sintering, vacuum metallurgy, vacuum drying, molecular distillation.

Hybrid Molecular Pump

The Molecular Pump of Hybrid Molecular Pump covers almost all possible application fields. The unique design of electromechanical integration has the characteristics of high prestage pressure resistance and is suitable for the vacuum environment of 10-10-10 millibar.

The Molecular Pump of Hybrid Molecular Pump has the following remarkable advantages:
1. Rich product range: covering all possible applications and all aspects of the market.

2. Patented technology of Hybrid Molecular Pump: maximum pumping capacity; Increase the pre-stage pressure resistance to 18 bar; The compression ratio increases by several orders of magnitude.

3. Integral rotor: each rotor is made of a single piece of aluminum alloy, with a minimum weight; The molecular pump can operate at any Angle at 360 degrees without any adjustment, reducing the pressure applied to the material and bearing.

4. High reliability, maintenance-free ceramic bearings: oil free, pollution free; Mean time to failure is greatly increased.

5. The built-in controller can use navigation control: simple and space-saving configuration; Navigation software can be easily controlled and monitored remotely.