There are many sales channels for straight coil heater in the market. As a consumer, how can we choose coil heater with good quality and long life? As a manufacturer specializing in the production of electric heating pipes, Huajiang believes that you can consider the following aspects when purchasing:
1 heat resistance
The component shall withstand 1000 cycles of heat resistance test under the specified test conditions and test voltage without damage;
2 heating time
Under the test voltage, the time from the ambient temperature to the test temperature shall not exceed 15 min;
3 rated power deviation
Under the condition of sufficient heat generation, the deviation of the rated work rate of the component shall not exceed the following components of rated power less than or equal to 100 W: ±10%. For components with rated power greater than 100W, it is +5%~-10% or 10W, whichever is the larger value;
4 leakage current
Cold leakage current and leakage current after water pressure and sealing test shall not exceed 0.5mA
The thermal leakage current at the operating temperature should not exceed the calculated value in the formula, but the maximum does not exceed 5 mA.
I=1/6 (tT×0.00001)
I—thermal leakage current mA
T—heat length mm
T-operating temperature °C
When multiple components are connected in series to the power supply, the leakage current test should be performed with this group of components as a whole;
5 insulation resistance
Cold insulation resistance should be no less than 50MΩ at the factory inspection
After the sealing test, the insulation resistance after long-term storage or use should not exceed MΩ
The thermal insulation resistance at the working temperature shall not be lower than the calculated value in the formula, but the minimum shall be not less than 1 MΩ.
R = "(10-0.015T) / t" × 0.001
R—hot insulation resistance MΩ
T—heat length mm
T—operating temperature °C;
6 insulation compressive strength
The component shall be kept for 1 min under the specified test conditions and test voltage without flashover and breakdown;
7 Ability to withstand power failure
The component shall be capable of undergoing 2000 electrical and electrical tests under the specified test conditions without damage;
8 overload capacity
The component shall withstand 30 cycles of overload test under the specified test conditions and input power without damage;
There are still many factors affecting the quality and service life of coil heater. The points listed above are considered by Suwaieto be more important. I understand the above aspects. When you choose coil heater, there are certain reference standards. When using the electric heating tube, it can also avoid the incorrect operation and affect the life of the coil heater.
Stainless steel electric hot runner heater is the heating method that must be used in almost all plastic molding die design. It is usually designed as one-way wiring and two-way wiring. The material can be made of seamed pipe, seamless pipe, stainless steel 201, 304, 316, etc. The pipe is characterized by small heat loss, high thermal efficiency, simple cable, and can be designed as 220V or 380V according to requirements, and the wiring is flexible and diverse. However, due to the limitations of its materials and processing technology, it is necessary to pay attention to its characteristics in the mold design.
First, the mold coil heater is generally a dry burning tube, so you must control the temperature when working, preferably not more than 150 degrees.
Second, the mold coil heater must be closely attached to the mold hole, so that the heat conduction effect is good, and the service life of the hot coil heater is also very good. The size of the heating tube of the cartridge heater produced by Suwaie can be accurate to ±0.08. Mm.
Third, the general mold heating tube usually has a long cold end at both ends, and can not play the role of heating. Therefore, it is recommended to use the imitation imported mold single-head electric heating pipe produced by our company. It is characterized by only one end of the cold end. And the cold end is generally about 1CM.
Fourth, the power design of the general mold electric heating tube should not exceed the limit of 6 watts / cm. For example, if the heating tube is 20 cm long, the power should not exceed 200W as much as possible. If the design power exceeds this limit, the surface load of the stainless steel single heat pipe is high, and the steel pipe is easily oxidized and corroded, causing a short circuit.