011051-1 FLOW dynamic seal; 5/16" ID of water jet cutting machine waterjet pump parts

011051-1 FLOW dynamic seal; 5/16" ID of water jet cutting machine waterjet pump parts

Ultra-high pressrue waterjet cutting machine is abbreviated as waterjet. It is a cutting device with water as the power and carrier. The cutting principle is that the high pressure generated when high-pressure energy-storage water is ejected from the nozzle The acceleration of the abrasive sand is transferred to the abrasive grit, so that the abrasive grit with high-speed kinetic energy hits the object to be cut until it penetrates. Its powerful power can achieve cutting effects that cannot be achieved by traditional cutting.

With the continuous promotion of equipment and the continuous improvement of technology, more and more consumers are not only concerned about the cutting ability of waterjet machines, but also their durability. Because the water used by water cutting equipment is not only a medium, but also works under ultra-high pressure. Therefore, in order to be able to withstand the ultra-high pressure impact of water, the high-performance sealing problem of the equipment will become very important. For the sealing problem of water jet cutters, the key indicator is the viscosity of the medium. Generally, the lower the viscosity, the better the fluidity, and the greater the difficulty of sealing. Viscosity is affected by working conditions. For example, the higher the working pressure, the faster the viscosity will drop; the higher the temperature of the working chamber, the slower the viscosity will drop. Therefore, the sealing design of water cutting should consider the combined influence of these factors:

1. Corrosion caused by water impact when the equipment is used for a long time.

2. The wear problem of the sealing device caused by the poor lubrication effect of water.

3. A series of side effects that may be caused by the high temperature generated when the water is compressed.

4. Leakage caused by low viscosity.

When water cutting objects, objects with different hardnesses will be processed with water at different pressures. The greater the hardness, the higher the pressure, the higher the requirements for sealing. For example, the application of waterjet cutting machines in metal processing requires very strict sealing design. rigorous.

The high pressure seal of waterjet machine is mainly divided into static seal and dynamic seal. It can also be divided into face seal and shaft seal according to the location and direction of the seal, and can also be classified according to whether there are seals.

1. Static sealing: Generally speaking, static sealing means that there is no relative movement between the sealed part and the sealed part in the sealed position. For example, the port of the one-way valve and the high-pressure cylinder on the supercharger is used Statically sealed.

2. Dynamic seal: The dynamic seal usually refers to the relative movement between the sealing part and the sealed part under normal working conditions at the sealed position. For example, the port where the high-pressure cylinder and the ceramic booster rod are connected in the supercharger, the ceramic booster rod moves back and forth in the high-pressure cylinder, and the seal ring sleeved on the ceramic booster rod is a dynamic seal.

3. Face seal: Face seal literally means a face-to-face seal, usually a radial seal, such as the jewel nozzle in the water switch of the water cutting equipment, the one-way valve, the spool, and the valve on the supercharger. The seals between the pads are all face seals. Face seals have very high requirements for radial quality, and very small scratches will also leak.

4. Shaft sealing: Shaft sealing refers to sealing along the axial direction. For example, both ends of the high-pressure cylinder are shaft seals whether it is a one-way valve or a ceramic booster rod.

5. Sealing with seals: For example, there are seals for sealing. Both ends of the high-pressure cylinder of the water cutting equipment and the waterjet water switch are sealed by combination seals made of special materials.

6. Seal without seals: In the waterjet pipeline, many seals are metal-to-metal static pressure seals. When two materials face each other, under the condition that the pressure is large enough, microscopically, the contact point of the two materials deforms, resulting in mutual inlay, forming a seal.

The high-performance sealing of a good waterjet is crucial. A good seal can make the equipment more durable and prevent many accidents.

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