What are the common refrigerator defrosting heater inspection and maintenance methods

1. The fan motor in the freezing room is damaged, resulting in no circulating cold air, so that the upper box has a certain degree of coldness, and the lower box is not cold. Inspection method: cut off the fan motor winding value, if it is infinite, it means that the fan motor winding is damaged due to open circuit, and the fan motor winding needs to be replaced. 2. The frost layer on the evaporator is too thick due to the damage of the defrost heater, the superheated defrost insurance or the open circuit of the bimetal defrost thermostat, which blocks the gap between the warped sheets of the evaporator and cannot pass the cold air. Maintenance method: Check the status of defrost heater, superheat defrost insurance, bimetal defrost thermostat, and replace damaged components.

Aug 25,2022

How to calculate the heating power of electric heater

1. Power during operation. Power - Heat loss in the system. All calculations should take into account the worst case: lowest ambient temperature, shortest operation, highest cycle operation, maximum weight of temperature heating medium (flowing medium as maximum flow). 2. Steps to calculate the heater power: According to the process, draw the heating process flow chart (does not involve the material form and specification). 3. Calculate the heat required for the process. Calculates the amount of heat and time required to start the system. Draw the heating process flow chart, consider the appropriate safety factor, and determine the total power of the heater. Determine the sheath material and power density of the heating element, determine the size and quantity of the heater, and determine the power supply and control system of the heater.

Aug 25,2022

How to solve the problem of large starting current of electric heating cable

Electric heating cable is a thermal insulation and antifreeze product for pipeline equipment. It has the characteristics of simple installation, high thermal insulation efficiency and convenient use. It has been widely used in pipeline equipment heat tracing and insulation in all walks of life. The models of electric heating cables can be divided into two series, self-limiting temperature and constant power. It should be noted that the self-limiting temperature electric heating cable has a larger starting current than that of constant power. Start-up current generally refers to the current peak value generated instantly when the electric heating cable is connected to the power supply, which is an important parameter that can reflect the quality of the electric heating cable. If the starting current is large, the length of the electric heat tracing cable of a single power supply will be shortened, which will affect the normal operation of the electric heat tracing system, and bring a great safety hazard to the operation of the power system in the entire environment. So how to solve the large starting current of the electric heating cable? When the starting current of the self-limiting electric heating cable is large, the automatic current limiter can be used for control, and it can be installed in the power box or distribution box. Its main technical feature is that there is an automatic voltage regulation circuit board connected in series with the load in the protection box, the automatic voltage regulator is controlled by the automatic unit circuit unit to control the thyristor to control conduction, and the delay circuit unit controls the relay circuit unit and DC power supply. circuit composition. It is a meter designed for the load starting with a large current, but the current drops quickly after the load is energized, and finally reaches a balanced state.

Aug 25,2022

Classification of electric heating pipes

1. Stainless steel finned heating tube, the shape is I type. 2. Stainless steel finned heating tube, the shape is U-shaped. 3. W-shaped finned heating tube, the shape is W-shaped. Features of finned electric heating tube: ①The heating element is small in size, ②The temperature rises quickly, ③The heating is uniform, ④The heat dissipation performance is good, ⑤The thermal efficiency is high, ⑥Long service life, ⑦Low cost and so on. Often used for heating of still and flowing air.

Aug 25,2022

What is the maximum maintenance temperature of the electric heating cable

The maximum temperature resistance of the electric heating cable usually refers to the maximum continuous temperature of the heating cable, and the heat resistance of the electric heating cable is higher than its maintenance temperature. The maximum tropical heat resistance temperature is 155 ℃ self-controlled temperature. Electric heating cable maximum temperature constant power: 205 degrees Celsius, MI armored heating cable with a maximum heat resistance temperature of 800°C. Different electrical models of the maximum temperature resistance of electric heating cables are different

Aug 25,2022