The maintenance of electric heater does not generate heat.
No fever means that the circuit of Emmett electric heater is not working. Carefully check the power supply fuse step by step, check whether the power supply fuse is blown, and check whether the power plug of the electric heater is in poor contact. Check whether the power cord of the electric heater is open, whether both ends of the quartz tube are loose or whether the quartz tube is open, whether there are temperature control elements, overheating protection devices and anti-dumping safety switches, and check whether these components are open.
For poor contact, it can be carefully polished with fine sandpaper to make it contact well. It is worth considering that when the electric heater is not placed horizontally, the anti-dumping safety switch may be turned off. In this case, as long as the electric heater is placed horizontally, the anti-dumping safety switch can be restored to the normal closed state.
The heating is intermittent.
The root cause of high or low fever is poor contact with selenium in the circuit, including loose socket and switch, loose lead connector of heating wire and melting point of Yuba heating wire itself. For the newly used electric heater, if the heat rises or falls, it is mostly because a fastening screw was not tightened during production and installation. If the fastening screws are tightened again, the failure point can usually be eliminated.
Of course, in power supply lines, such as power switches, fuses and other parts, if there is a poor contact problem, it is also the cause of high and low fever. When encountering this kind of fault, we must actively look for the fault point and don't use it reluctantly. Because there is poor contact in the circuit, it will endanger the safety problem.
Overheating of shell
The far infrared heater has a reflector, and Yuba effectively reflects far infrared rays to the heated space. If the reflector is not clean, its reflection ability will decrease, which will cause more heat to stay in the electric heater, thus increasing the temperature of the electric heater itself. Therefore, ensuring the brightness and clarity of the reflector is an effective way to reduce the temperature rise of the electric heater itself. In addition, it also has a certain relationship with the design and installation of reflector.
Types and characteristics of electric heaters 1. Conductive electric heater
This kind of electric heater mainly includes electric bag, electric cake (electric soup girl), electric cooker, electric hand warmer, electric foot warmer (electric shoes), electric bed board and electric quilt. They are characterized by clear use, strong adaptability, convenient use, less electricity consumption and low price, but they are usually only suitable for heating a certain part or a small area of the human body, not for heating a room or a large area of objects.
2. Radiant electric heater
This kind of electric heater is mainly composed of sealed or unsealed electric heating elements, parabolic or arc radiation plates, protective cover, power (fire) regulator and base. This kind of electric heater is generally classified according to the different electric heating radiation elements, mainly including quartz tube type, microcrystalline tube far infrared type, electric heating wire type, halogen tube type, PTC ceramic type and so on. In addition, there are desktop and vertical; Ordinary type and remote control type; Double heating pipes and three heating pipes (or multiple heating pipes); Rectangular (square) and circular; Ordinary net cover and small solar (radar) net cover, etc. Several typical common radiant electric heaters are shown in Figure 2. Among them, quartz tube and microcrystalline tube far-infrared electric heaters are afraid of being hit or burst by cold water at high temperature because of poor impact resistance of timely electric heating tubes, and the protective net cover is easy to burn users at high temperature. If the shell is not well insulated, some plastic shells may melt and deform, which may cause fire, so it has been gradually eliminated. But the low price is its advantage, usually only a few tens of dollars, so some consumers are still willing to use this electric heater. The price of electric heating wire is also low, but the thermal efficiency is low and the power consumption is expensive, so the market share is small.
Halogen tube heater adopts halogen heating tube, which is filled with high-purity argon and halogen gas. The heating tungsten wire is usually treated with anti-oxidation, which can prolong the service life compared with timely heating tube. Some halogen tube heaters use advanced lattice gratings, which have soft light transmission and uniform and comfortable heating.
PTC ceramic heater is a kind of heater which uses positive temperature coefficient ceramic elements as heating elements. Because this heating element has many advantages (see below), PTC ceramic products occupy a large proportion in radiant electric heaters.
3. Convection electric heater
The main feature of convection electric heater is to heat the room evenly. Products mainly include oil-filled radiator and PTC ceramic heater.
(1) oil-filled radiator
Oil-filled radiator, also known as oil-filled electric heater, consists of sealed electric heating elements, metal radiating pipes or fins, and thermostat. Nowadays, oil-filled radiators are mostly beautiful in appearance. A new type of heat transfer oil is installed in the radiator cavity of this electric heater. After the power supply is turned on, the heat transfer oil around the electric heating tube is heated, rises above the cavity, and carries out convection circulation along the radiator, so that the heat is dissipated through the surface of the radiator in a large area, thus achieving the purpose of heating up and warming up.
Oil-filled radiators have 7, 9, 10 and 12 fins, with power consumption of 800 ~ 2,500 w and 7~9 fins. Oil-filled radiators with rated power of1500 ~ 2,000 w are widely used in general households. The main characteristics of oil-filled radiator are strong safety, uniform temperature rise, comfortable and soft feel, tasteless and smokeless. But the disadvantage is that the price is higher, the heating speed is lower than that of the radiant electric heater, and the power consumption is higher. However, now many new oil-filled radiators have added heating fans, thus increasing the heating speed; There is also an automatic temperature control device, which is more convenient and free to use.
(2)PTC ceramic heater
PTC ceramic heater is actually a combination of PTC ceramic heater and electric fan, which has some main characteristics of PTC heater and oil-filled radiator. PTC ceramic heater is energy-saving, automatic constant temperature, non-redness, no open flame and safe to use.
Characteristics of heaters with different heating modes 1. Heater, that is, forced ventilation heater. This kind of product uses the fan in the heater to suck indoor cold air from the air inlet, and then flows through the electric heating element to heat it, and then sends hot air from the air outlet, so as to achieve the purpose of heating. It has the characteristics of automatic power adjustment, self-temperature limitation, rapid temperature rise and relatively uniform and comfortable room temperature. Disadvantages are high energy consumption, noise caused by fan rotation, dust pollution caused by rapid air flow, and air quality will decline after a period of use.
2. The hot heater, also known as oil-filled radiator, is filled with heat-conducting oil in its cavity and has a large area of fins on its surface. When the power supply is turned on, the heat transfer oil around the built-in electric heating element is heated, and then the heat is dissipated to the space through the fins to achieve the purpose of heating. Coupled with infrared radiation and convection, it can be said to be a compound heater, which is characterized by long service life, safety and hygiene, dust-free, and no need to replace heat transfer oil. Disadvantages are high energy consumption, large thermal inertia and slow temperature rise.
3. Convection heater, with high safety performance and quiet operation, has the disadvantages of slow heating, poor indoor temperature uniformity, and flowing air will produce dust pollution to a certain extent.
4. electrothermal film heaters, including high-temperature electrothermal film heaters and low-temperature electrothermal film heaters, belong to radiation heaters. This kind of products use electrothermal film as heating material, which has developed rapidly in recent years. It has good water tightness, flexibility, folding resistance, corrosion resistance and aging resistance. After the electric heating film is electrified, the electric energy is converted into heat energy, and the heat energy mainly spreads by radiation. In addition, the heating element of electric heating film can be combined with decorative painting to make wall-mounted or desktop electric heating painting, which is an attractive and practical multifunctional handicraft. But the market is still immature and there are not many products.
5. The compound heater uses any combination of two or more ways of radiation, convection and forced ventilation to transfer heat and achieve the purpose of heating the room.
Guess you are interested in:
1. Common faults and maintenance methods of induction cooker
2.20 17 introduction of the latest tips for saving electricity of household electric heaters.
3. Tips for choosing electric heaters
4. Cable maintenance methods and skills
5. How to repair the induction cooker burning insurance?