Water-cooled cable principle, function & classification

What is a water-cooled cable?

Water-cooled cable, commonly known as water cable, is a kind of hollow water-passing special cable used for high-current heating equipment. It usually consists of three parts: electrode (cable head), wire, and outer sheath.

Electrode holder cable principle

Its main feature is that the center of the cable core is a hollow metal conductor, so the hollow water has a significant cooling effect. Because the current passing through the cable is too large, resulting in too high heat generation, water is needed to cool the cable, which generally refers to the connecting cable from the capacitor cabinet to the induction coil.

Due to the good water cooling effect, the current density of the water-cooled cable can reach about 4A/mm², which is double the current density allowed by the bare flexible cable. The current carrying capacity is large, but the temperature rise is low and the mechanical strength is high, so the operating safety factor is greatly improved.

For ordinary water-cooled cables, the electrodes are welded with copper tubes and copper bars, which are not tightly connected to the equipment. The wire is made of copper bare wire twisted, and the bending radius is large. The outer sheath is made of ordinary rubber hose, which has low pressure resistance. The sleeve and the electrode are fastened by ordinary clamps, which are not very good in sealing and are more prone to water leakage. Therefore, do not use water-cooled cables with poor quality.

High-quality water-cooled cables, the electrodes are made of integral copper rods by turning and milling, and the surface is also passivated or tinned. The wire is made of tinned copper stranded wire or enameled wire, woven by a CNC winding machine, with a small bending radius and high flexibility. The outer sheath is a synthetic rubber tube with a reinforced interlayer, which has high pressure resistance. Between the sleeve and the electrode is the copper clamp used, which is fastened by cold extrusion with professional equipment, and has good sealing performance and is not easy to leak. Therefore, it is safer and more secure to use high-quality water-cooled cables.

Types and characteristics of water-cooled cables

1. Flare lock nut water cooling cable

The connection with the equipment is combined with a conical surface, and the nut is locked to ensure the largest contact surface, reliable current transmission, and good cooling water sealing effect. for high frequency equipment.

2. Electric arc furnace water cooling cable

The surface of the electrode is tin-plated, corrosion-resistant, and has good electrical conductivity. The end has a hoisting ring, which is convenient for on-site installation. The hose and the electrode are fastened with two stainless steel clamps, which are safe and reliable. Good bending performance, the soft conductor is made of high-strength enameled wire, corrosion-resistant, and has no surface skin effect.

3. Coaxial water cooling cable

Two channels of water, two channels of electricity, coaxial, when transmitting medium and high frequency current, there is no surface skin effect, less leakage inductance, less power loss, high power transmission efficiency and energy saving.

4. Resistance furnace water cooling cable

The electrode is made of a whole copper rod; the soft wire is made of enameled wire, and there is no green embroidery after long-term use; the outer sheath hose has high working water pressure resistance and will not break; the cooling water channel is smooth and the cooling effect is good; the outer sheath hose is resistant to High breakdown voltage, large current transmission, safe and reliable; a variety of specifications, a variety of models for users to choose.

5. Water-cooled cable for electroslag furnace

The electrode has various structures (flat flange type; bell mouth type; rotating electrode type), and there are three types of water inlet and outlet positions (on the side of the electrode; on the flange plane; on the end face of the electrode); the soft wire is made of enameled wire, and has no green color for long-term use. Embroidery; the outer sheath hose has high working water pressure resistance and will not break; the cooling water path is smooth and the cooling effect is good; the outer sheath hose has high breakdown voltage resistance, transmits large current, and is safe and reliable; a variety of specifications, a variety of models, for users to choose.

6. Water cooling cable for submerged arc furnace

The electrode material is T2 copper, the electrode structure can be made according to the user's requirements, and the surface is tin-plated; the position of the water inlet and outlet can be determined according to the installation position of the user's equipment. High current, safe and reliable.

7. Water cooling cable for vacuum furnace

One end of the cable electrode is a bell-mouth lock nut type, which is connected to the induction coil in the vacuum furnace, and the other end of the electrode is a flat flange type, which is connected to the capacitor. Body sealed, in the water-cooled cable part inside the vacuum furnace, the outer sheath is treated to prevent high temperature, the cooling water of the water-cooled cable directly enters the induction coil in the vacuum furnace, circulating cooling, widely used in the vacuum sintering furnace of NdFeB magnetic materials, Can replace foreign imported cables.

8. Polycrystalline furnace water cooling cable

The water-cooled cable electrode is connected with the coaxial electrode of the induction coil of the polysilicon purification furnace. The structure of the water-cooled cable electrode is a 90° elbow bell mouth taper locking type, which ensures no twisting when connecting with the polysilicon purification furnace, ensures natural bending, and improves the Service life of water-cooled cables.

9. Water cooling cable for single crystal furnace

Non-contact electrodes, the surface is treated with anti-corrosion, and the water inlet and outlet are connected with a live wire buckle after adding a sealing ring. The soft wire is made of enameled wire (the only one in the country), which is rust-proof and soft, and is not easy to break. The soft wire is connected with electrical grade cold extrusion. It is treated with tin, and the contact effect is very good. The outer sheath tube used is a special high-quality rubber tube customized from a rubber factory. The rubber tube and the electrode sealing hoop are made of copper clamps, and are connected by special equipment. The bending radius of the water-cooled cable is small. long lasting.

10. Water cooling cable for intermediate frequency furnace

Enameled wire is used for soft conductor, no surface skin effect when transmitting intermediate frequency current, high power transmission efficiency, low calorific value, and the outer sheath hose is not easy to age; the enameled wire is softened, and the stress on the connection part with the electrode is small, and the furnace is repeatedly turned over and over. When working, the connection between the water-cooled cable electrode and the soft conductor will not be broken.

11. Hollow water cooling cable

The soft conductor of water-cooled hollow cable is a hollow water-cooled cable made of tinned copper stranded wire on a special braiding machine. The cable is soft, the bending radius is small, and the effective section is large. The water-cooled hollow cable is a new type of special cable, which can meet the needs of long-term work with high current.