WLW-NF series corrosion-resistant dry reciprocating vacuum pump

Detailed Introduction

Corrosion-Resistant Pump Product Introduction

Currently, most vacuum pumps on the market are made of cast iron, steel, and stainless steel, as well as other alloy materials. The drawbacks of these materials are their poor resistance to corrosion by chemically active gases and liquids, leading to frequent vacuum pump failures, high maintenance workload, and short service life.

Existing methods for anti-corrosion treatment of metal surfaces include: nickel-phosphorus alloy plating, Teflon plating, and stainless steel powder spraying. The drawbacks of these surface coatings are: poor coating adhesion, easy peeling, severe pitting corrosion, and short effective anti-corrosion period. Therefore, surface treatment technology cannot completely solve the problem of vacuum pumps drawing corrosive gases.

The steel-lined engineering plastic corrosion-resistant vacuum pump developed by our company uses steel as the base material, with a layer of modified polytetrafluoroethylene material with a certain thickness (≥4mm) lining the surface of the part's flow path, forming a steel-plastic composite component. The metal part and the engineering plastic are tightly bonded, and are resistant to high temperatures, pressure, and vacuum. The parts retain the strength and rigidity of the metal parts while possessing the excellent corrosion resistance of the engineering plastic. In chemical processes, gas neutralization treatment is not required before the vacuum pump, and corrosive gases can be directly drawn in. Almost all acid, alkali, and salt media will not corrode the plastic-lined parts, so it is perfectly suitable for all occasions in the chemical and pharmaceutical industries where corrosive gases need to be drawn. The vacuum pump performance is the same as that of ordinary vacuum pumps.

Features:

1. Advantages

• All flow path surfaces of the flow components are lined with a certain thickness of modified polytetrafluoroethylene on the steel parts, which can withstand corrosion from most chemical media.

• Due to the effective cooling device, the temperature of the parts is controllable, and thermal expansion and deformation caused by temperature changes are avoided.

• The parts are supported by inner and outer metal parts, and the overall strength and rigidity of all parts are the same as those of metal parts.

• Due to the self-lubricating properties of the material, carbon deposition is unlikely when high-temperature gases flow through.

• No neutralization device needs to be installed before the vacuum pump; corrosive gases can be directly drawn into the pump.

• Compared with nickel-phosphorus alloy plating, Teflon, and thermal spraying of stainless steel, it has better adhesion, no peeling, good corrosion resistance, and long service life.

2. Operating Conditions

• Suitable for drawing most chemical gases (according to the selection of polytetrafluoroethylene material).

• Operating temperature ≤200℃.

• Suitable for long-term operation.

• Suitable for sudden cooling and heating environments.

• Resistant to all chemical organic solvents.

Structural Overview

• The cylinder body shell is a metal part, and the inner liner is a non-metal part.

• The cylinder head base is a metal part, and the flow path surface in contact with the gas has a layer of engineering plastic with a certain thickness.

• The piston base is a metal part, with an outer layer of engineering plastic.

• The piston rings and intake/exhaust valves are all made of engineering plastic.

• Multiple sets of intake/exhaust valves ensure more thorough intake/exhaust and automatic adjustment.

• The piston rod and fixing nut have an outer layer of engineering plastic.

Performance Advantages

• The inner and outer lining materials have excellent high-temperature resistance (≤200℃), abrasion resistance, high-pressure resistance, and negative-pressure resistance, ensuring that corrosive media will not corrode or damage the parts, effectively maintaining the safe and reliable operation of the parts.

• The advantages of multiple sets of intake/exhaust valves are: the number of intake/exhaust valves opened can be automatically adjusted according to the size of the intake pressure, reducing the exhaust impact force and noise.

• Completely dry and corrosion-resistant, suitable for drawing corrosive gases in most chemical and pharmaceutical production processes, and suitable for solvent recovery processes.

• Replacing water jet pumps and water/steam dual-purpose pumps can save 40-60% energy and eliminate water pollution.

WLW-NF Corrosion-Resistant Reciprocating Vacuum Pump System Diagram

Curve Chart

Technical Parameters