What is a Heating Pad?

Car heating pad is a kind of seat pad that heats the car seat, which makes people not feel cold when driving the vehicle.

Car heating pad

Built-in car heating pad and external car heating pad

Before use, insert the cigarette lighter head into the cigarette lighter;

When in use, turn on the high-end first to make it warm up quickly;

After the third warm, change to the middle gear to keep the temperature at a constant state;

Four friends sitting for a long time can adjust the low gear to the most suitable temperature;

5. After use, turn off the switch. Unplug the cigarette lighter.

It is strictly forbidden to place an external car heating pad inside the car seat cover! If it is placed in the seat cover, the internal temperature cannot be effectively dissipated, resulting in temperature accumulation and danger! After getting out of the car, please turn off the switch and unplug the power at the same time, so as not to cause dangers such as concentrated photocell current. For the safety of your car, please cut off the power in time before getting off the car. ^[1]

When buying, it is best to choose a fast heating speed,

The principle is not complicated. A temperature-adjustable heating body is added to the seat cushion. As long as the seat cushion is connected to a car power source, the seat cushion can generate heat. It is worth noting that the price of this product is very different. It is tens of dollars cheaper on the Internet and thousands of dollars more expensive.

At present, car heating cushions on the market that cost tens of yuan are basically directly connected to the cigarette lighter, which is easy to burn out the fuse. There are also some car heating cushions that are not directly connected to the cigarette lighter. The installation process will also change the line. The voltage limit of each car is specified. Once an additional new resistance is added, it may cause a short circuit in the car current. Cause a fire. Therefore, it is not recommended for car owners to install such heating cushions at will.

1. Electrical energy and thermal energy are two different forms of energy. Heating pads are converted from each other by the law of energy conversion. It can be seen that they can be converted to each other. Various types of electric heating appliances complete electrical-to-thermal conversion through certain electric heating elements.

According to the different working principles of electric heating elements used in electric heating appliances, it can be divided into five categories: resistance heating, induction heating, microwave heating, arc heating and infrared heating. Among them, the arc heating is to apply voltage to two electrodes, and use the electrode to generate a discharge between the electrode or the element to promote the high temperature generated by the ionization of air to heat the element. It is mostly used in industrial production. In this chapter Not too much in the introduction. In domestic electric heating appliances, resistance heating is most widely used.

2. Induction heating

It is known from electromagnetic theory that if a conductor is placed in an alternating magnetic field, an induced current (eddy current) will be generated inside the conductor, and the eddy current inside the conductor will overcome the internal resistance to make a swirling flow and generate heat. This type of electric heating appliance using eddy current to generate heat is called an inductive electric heating appliance.

The principle of inductive electric heating is also a kind of resistance heating in essence, but its working current is not obtained directly from the power supply but is obtained by induction, so it is called induction heating. Induction heating can be divided into two types: core induction heating and coreless induction heating. Iron core induction heating uses the principle of a transformer to heat the object to be heated as the secondary winding of the transformer, such as an induction electric soldering iron.

Ironless core induction heating is to place the object to be heated in an alternating magnetic field, and the upper electric blanket uses the eddy current induced by the object to be heated in the alternating magnetic field to heat, such as an electromagnetic stove in a household appliance. If power frequency current of 50 ~ 60Hz is passed, it will be power frequency electromagnetic cooker; if high frequency current above 20kHz is passed, it will be high frequency electromagnetic cooker. The electromagnetic cooker is mainly high frequency electromagnetic cooker.

3 Microwave heating

This is a way to place a heated medium object in a high-frequency alternating electric field and use microwaves (wavelength: 1mm ~ lm) to irradiate the molecules inside the medium with intense vibration and generate heat. Electric heating appliances made using this heating principle are called microwave-type electric heating appliances.

Among the household appliances, its typical product is a microwave oven. It is the most widely used, the most complete technology, the safest and most reliable microwave electric heating appliance. It has the advantages of uniform heat distribution and high thermal efficiency. General electric stove or fuel stove is 4-12 times faster. Microwave ovens use two frequencies, 915MHz and 2 450MHz. Most of the 915MHz microwave ovens are used in industrial baking, electric heating pad drying, disinfection, etc. Household microwave ovens generally use the 2450MHz frequency.

4 Infrared heating

When the electric heating element-resistance heating wire is energized, its electric energy is converted into thermal energy to heat a certain infrared radiation substance, and the infrared radiation emitted by it is used to heat an object. An electric heating appliance made by this principle is called an infrared electric heating appliance.

The principle of infrared electric heating appliances is radiant heating, which has more obvious advantages than convection and conduction methods, such as improved thermal efficiency, which can greatly save energy, heat up quickly, have strong penetration, and save time. Common infrared heaters include infrared heaters and electric ovens. ^[3]