1 Chemical pump seal ring what kind of material
1-1 chemical pump equipment to seal are inseparable from the sealing ring, similarly, like chemical pumps, centrifugal pumps, corrosion resistant pumps, alkali pumps, etc., usually use the form of mechanical seal seal, mechanical seal material, there are many kinds of materials as auxiliary sealing ring rubber, plastic, asbestos, expanded graphite, graphite and metal expansion ring. Rubber ring is a widely used auxiliary sealing ring. Commonly used rubber sealing ring materials are nitrile rubber, fluorine rubber, silicone rubber, neoprene rubber, styrene butadiene rubber, perflurane material and so on.
1-2 polytetrafluoroethylene has excellent chemical stability and oil resistance, solvent resistance, anti-aging, temperature resistance, and has a fairly low friction factor and a certain strength, elasticity, flexibility and non-adhesion, so it is widely used as a sealing ring under various temperature, pressure, corrosive media conditions.
1-3 nitrile rubber is a commonly used oil-resistant rubber. It is a copolymer of butadiene and acrylonitrile. According to the amount of acrylic nitrile content is divided into several kinds: low acrylonitrile (butadiene-18), medium acrylonitrile (butadiene-26) and high acrylonitrile (butadiene-40), the higher the acrylonitrile content, the better its oil resistance, tensile strength, hardness and wear resistance, water resistance increases, and permeability decreases. Subsequently, its solubility in polar solvents increases, corrosion resistance is also affected, and elasticity and cold resistance are also poor. Nitrile rubber is not resistant to flexure and has poor tear resistance.
1-4 fluorine rubber has the advantages of high temperature resistance, oil resistance and chemical corrosion resistance. Fluororubbers are widely used in fluorolefin copolymers, mainly type 26 and type 23. Type 26 includes the emulsion copolymer of fluororubber-26 system of vinylidene and hexafluoropropylene and the terpolymer of fluororubber-246 system of vinylidene fluoride, hexafluoropropylene and tetrafluoropropylene. Fluororubber 23 is an amorphous rubber-like copolymer prepared by suspension polymerization of vinylidene fluoride and chlorotrifluoride at room temperature and 3.24MPa pressure. It cannot be used in liquid ammonia or ammonia water.
2 What are the sealing rings of chemical pumps
The sealing of chemical pump is guaranteed, and the sealing ring is indispensable. The sealing ring has the effect of isolating hydraulic oil and preventing hydraulic oil from spilling or leaking. The sealing ring is divided into the following categories: dust ring, piston rod seal ring, buffer seal ring, bearing end cap seal ring, conductive support point change.
2-1. Dustproof ring of chemical pump
The dust-proof ring of the chemical pump is installed on both sides of the bearing end cover of the hydraulic cylinder to prevent external air pollutants from entering the hydraulic cylinder, and can be divided into clamping type and pressing type according to the different installation methods.
2-2 chemical pump inserted dust ring
The stuck dust ring is one of the installation methods of the above dust ring, which is more common. The dust ring is stuck in the concave cavity of the bearing end cap for use under less stringent natural environmental standards. The raw material of the clamped dust ring is generally polyurethane material, and the structure is combined in a variety of ways, such as H and K cross sections for lip structure.
2-3 Acid and alkali resistant chemical pump piston rod seal ring
Chemical pump piston rod seal ring is (Keyikai intelligent pump: www.kykznb.com) the key piston rod hydraulic seal, the role is to prevent gear oil leakage, also known as U-cup, installed in the hydraulic cylinder bearing end cap inside the side. In some places, the piston rod seal ring needs to be used with the support point ring, which is used to prevent the sealing ring from kneading under the effect of working pressure.
2-4. Chemical pump buffer seal ring
The buffer seal ring is generally used as an assistant to the piston rod seal ring to maintain the piston rod when the working pressure of the system software is suddenly increased. There are three types of cache seals, which are used to prevent sealing kneading and allow hydraulic seals to bear higher working pressures.
2-5. Bearing end cover sealing ring of chemical pump
The bearing end cap seal ring is a packing seal used to ensure the sealing of the hydraulic cylinder bearing end cap and the hydraulic cylinder wall. It is generally composed of nitrile rubber o-ring and support point ring to prevent gear oil leakage from the bearing end cover and the gap of the hydraulic cylinder wall.
2-6. Guiding support point ring of chemical pump
The guide support ring is mounted on the hydraulic cylinder bearing end cap to support the point piston rod and the piston rod. Raw materials with plastic, brass coated with polytetrafluoroethylene, etc., correctly guide the piston rod to do uniform linear motion to prevent the occurrence of metal materials and metal materials contact.