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07-30

Function of temperature fuse

Temperature fuse, also known as thermal fuse, is a new type of electrical overheat protection element. This kind of element is usually installed in the electrical apparatus which is easy to generate heat. When the temperature exceeds the abnormal temperature, the temperature fuse will automatically fuse, cut off the power supply and prevent the electric appliance from causing fire. In recent years, most of the household electrical appliances with heating as the main function, such as electric rice cooker, electric charge bucket and electric stove, have been installed with temperature fuse, which can cut off the power supply in time in case of internal failure of the machine parts, prevent further damage to the electrical appliances, and put an end to the fire caused by this. Temperature fuse and we are familiar with the fuse, it is usually only used as a power path in the circuit, in use if it does not exceed its rated value, it will not fuse, no effect on the circuit. Only when the electric appliance breaks down and produces abnormal temperature, it will fuse and cut off the power supply circuit. This is different from fuse fuse, which is due to the heat generated when the circuit exceeds the rated current.  Temperature fuse has the characteristics of accurate fusing temperature, high voltage resistance, small size and low cost. The rated temperature value and rated current value are marked on the shell of the temperature fuse, so it is easy to identify and use. It can be widely used in electrical equipment, electric heating equipment and practical electrical appliances, etc. for overheat protection. Temperature fuse has the following parameters:   ① Rated temperature: sometimes also known as operating temperature or fusing temperature. It refers to the temperature rising to the fusing temperature at the speed of 1 ℃ per minute without load. ② Fusing accuracy: refers to the difference between the actual fusing temperature and the rated temperature of the temperature fuse. ③ Rated current and rated voltage: the nominal current and voltage of general temperature fuse have certain margin, usually 5A and 250V.  The temperature fuse is a kind of one-time protective element. Its effect depends not only on the performance of the component itself, but also on how to select and install the temperature fuse correctly. When the temperature fuse is used, it is usually connected in series in the circuit. Therefore, when selecting the temperature fuse, its rated current value must be greater than the current used in the circuit. The current passing through the temperature fuse is not allowed to exceed the specified rated current value. Before selecting the rated temperature of the temperature fuse, it is necessary to know and measure the temperature difference between the temperature to be protected and the temperature at the position where the plant fuse is installed. In addition, the length of fusing time and ventilation are also closely related to the selection of rated temperature of temperature fuse.
07-30

How to use temperature controller to achieve real energy saving

In the national clean heating "coal to electricity" initiative, more and more families use electric heating, how to save energy has become a concern of many people. In addition to building insulation, temperature control is one of the key to energy saving. Some users who have installed electric heating always turn on the thermostat when they need it and turn it off when they go out, thinking that this will save electricity. In fact, it will not only save energy but also consume more energy. So how to use the thermostat to achieve real energy saving?     Misunderstanding 1. Instant energy saving?   Turn on the thermostat when necessary and turn it off when going out, which will consume energy. Electric heating system is a low temperature operation system. It has good heat storage property. It takes a certain time to make the room temperature reach the set temperature after the system is turned on, but the indoor temperature will not drop rapidly after the system is turned off. It also takes a long time for the temperature to rise again when it is opened again. Frequent switching not only can not save energy, but also increase the operating cost of heating system.   Correct usage:   In a room that is not commonly used, the temperature can be lowered by a few degrees by the temperature controller. When leaving the room for a long time, the temperature of the temperature controller can be reduced by a few degrees. In the case of long-term absence of people or leaving for a long time, the system can be turned off. However, it should be noted that if there is equipment in the room that is afraid of freezing damage, it is also necessary to open it to a certain temperature to prevent the equipment or pipeline from freezing and cracking.         Mistake 2. The higher the set temperature of the thermostat, the faster the temperature rise? Some users feel that the room temperature is low and they need to heat up quickly to set the temperature of the thermostat to the highest. This practice is also wrong. The heating time of room temperature depends on the indoor and outdoor temperature difference and the installed power per unit area of the room. When the installation power and the indoor and outdoor temperature difference are fixed, no matter how many degrees are set, the time for the room to rise to the temperature you need is the same. If the room is now 16 degrees and you want to make the room temperature rise to 18 degrees, in this case, setting the room temperature to 18 degrees or 20 degrees, 25 degrees is the same as heating to 18 degrees.   Correct usage:   Set as many degrees as you need, or use an intelligent thermostat, which can automatically calculate the opening time of the thermostat in advance.
07-30

Longdekeke: the function of temperature fuse in circuit

Temperature fuse, also known as thermal fuse, is a new type of electrical overheat protection element. This kind of element is usually installed in the electrical apparatus which is easy to generate heat. When the temperature exceeds the abnormal temperature, the temperature fuse will automatically fuse, cut off the power supply and prevent the electric appliance from causing fire.
07-30

Why can't fuse be replaced by copper wire

Although the fuse is also a kind of metal wire, it is different from ordinary copper wire and iron wire. It is soft and is made of lead, antimony or low melting point alloys such as lead and tin. It has high resistivity, low melting point and is naturally afraid of heat. Due to the thermal effect of the current, as long as the current passing through the fuse exceeds the rated current of the fuse and reaches the fusing current, the fuse will fuse rapidly and automatically disconnect the circuit and power supply. In this way, the strong current can no longer enter the user's home, so as to prevent the instruments, appliances or wires connected in the circuit from burning out due to the strong current. The fuse is broken and can't be replaced by copper wire or iron wire. If the fuse is replaced by copper wire or iron wire, because of their high melting point, even if the strong current passes through, it will not melt, so it can not cut off the current automatically and can not play a role of safety. It is very dangerous. In addition, when installing the fuse, you must pay attention to choose the appropriate thickness. There are many specifications of fuse, usually expressed by its rated current. For the fuse of the same material, the larger the section diameter, the larger the allowable rated current. Therefore, the total current through the circuit must be slightly greater than the rated current of the circuit. In this way, not only can the fuse work normally, but also can ensure that the fuse can quickly fuse and cut off the circuit when encountering excessive current. If the rated current of the fuse is too large, it will not fuse when there is too strong current passing through the circuit, and it will not play the role of insurance, which is no different from connecting steel wire and iron wire; if the rated current is too small, then in the normal power consumption, the fuse will also blow, causing power failure.
07-30

Importance of reasonable selection of fuse holder

1、 There are various installation methods 1. In the panel of some electrical equipment, we can see the fuse holder product, such as speaker, massage chair and other electrical equipment. This product is often installed in some small household appliances and some industrial machinery, and it is often installed through some leads. 2. Using PCB products and some fuse clips, using this device in these household appliances can ensure the safety of these appliances in the process of use, and avoid the occurrence of short circuit or excessive total power and other accidents. 3. This product is often used in the car, and the way to use it is similar to several ways installed on small household appliances, which can ensure the safety of the car in the process of driving     2、 Choose the right one for installation When fuse is used in different equipment, the type of fuse required is also different, which makes people choose different types of fuse holder. Now there are many types of products on the market. Different types of products can be selected according to the size of the fuse, and different types of products can be selected according to the material. At present, the products are also divided into environmental protection type and non environmental protection type. Therefore, people in the choice of this product, must choose the appropriate model, in order to ensure that the fuse can be better installed, and to ensure that the fuse has a good use effect.     Fuse holder is now widely used in life, in the purchase must be based on the specific situation, choose the appropriate product type, so as to ensure better use.
07-15

Key points of fuse selection

Key points of fuse selection   I believe we all have a headache in choosing fuses because there is no good guidance, The following is a list of the factors involved in fuse selection, You can choose the most suitable fuse according to these ideas.   1. Normal working current: the reliable working current of fuse is usually 75% of rated current at 25C to avoid failure. For example: in 25C environment, it is not recommended to use fuse with rated current of 10a to work above 7.5A. 2. Application voltage (AC or DC): the rated voltage of the fuse must be equal to or greater than the voltage of the applied circuit. 3. Ambient temperature: the higher the ambient temperature, the hotter the fuse works and the shorter the service life. On the contrary, working at a lower temperature will prolong the service life of the fuse. The fuse is also hotter when the normal operating current approaches or exceeds its rated value. 4. Overload current: it defines the current that the circuit needs to be protected in case of a fault. The fault condition can be current or current and the maximum fault time that can be sustained before damage occurs. In the matching of fuses and circuits, the time current curve should be considered, but remember that the curve is based on average data. 5. Maximum fault current: the fuse rating must meet or exceed the maximum fault current of the circuit. 6. Pulse (current mutation, surge current, start-up current and circuit transients): electrical pulse conditions may vary greatly in different applications. Different fuse configurations may not respond the same to a given pulse condition. Thermal cycling and possible mechanical fatigue caused by electrical pulses can affect the service life of fuses. The initial pulse or starting pulse is normal for some applications where the fuse is to be selected with a thermal delay design to maintain the normal start pulse and still provide protection in the event of prolonged overload. We should refer to and compare the time current curve and i2t rating of the fuse for the selection of the fuse which should respond to the starting pulse. 7. Physical size limits: refer to the manufacturer's data book for fuse length, diameter and height information. 8. Agency approval required: refer to the manufacturer's data book for information on Agency approval for a specific device, such as UL, CSA, VDE, METI, or MITI. Military requirements need special consideration. 9. Fuse characteristics: refer to the manufacturer's data book for installation type / overall dimensions, ease of disassembly, axial leads, visual indications, etc. 10. Fuse holder characteristics and reassessment: refer to the manufacturer's data book for information on clips, mounting blocks, panel mounting, PCB mounting, RFI shielding, etc. 11. Pre production application testing and validation: verify the selection by requesting samples to be tested in the actual circuit. Before evaluating the sample, make sure that the fuse has a good electrical connection and that the cable connection used is appropriate. The test shall include a life test under normal conditions and an overload test under fault conditions to ensure that the fuse works properly in the circuit. The above are the key points of fuse selection,
07-15

What fuses do you know

There are many kinds of fuses, such as protection type, application range, volume, rated voltage, breaking capacity and fusing speed, The following is an introduction to the classification according to the type: current fuse: patch fuse, micro fuse, plug-in fuse, tubular fuse; temperature fuse: RH square type, RP resistance type, ry metal shell; self recovery fuse: plug-in, lamination, patch.   1、 Current fuse. 1. SMD fuse. There are 0805, 1206 and other specifications. Thin film technology is used to accurately control electrical characteristics. Due to its small size, it is more suitable for circuits in space limited applications to provide secondary protection, such as portable electronic devices and various instruments. 2. Tubular fuse. This is very common, especially in switching power supply and other power supply applications. 3. Insert fuse. It can be seen in automobile use occasion, sometimes also called fork bolt fuse 4. Miniature fuse.   2、 Temperature fuse. Temperature fuse, also called thermal fuse (GB 9816.1-2013), is a temperature sensing circuit cut-off device. The temperature fuse can sense the overheat caused by abnormal operation of electrical and electronic products, and cut off the circuit to avoid the occurrence of fire. It is an irrecoverable disposable thermal protection device, including RH, RF, ry series, etc. the product has exquisite appearance structure, good sealing performance, sensitive and reliable operating temperature, small impact of current impact and vibration resistance. It is mainly used in electric fans, electric cookers, electric frying pans, disinfection cabinets, etc.   1. RH square temperature fuse. The appearance is a plastic square shell shape, block type temperature fuse, generally low melting point alloy type 2. Ry metal case temperature fuse. It adopts metal shell and organic chemical material as heat sensing body. It has sensitive induction, accurate action and reliable performance. For rice cooker, hair dryer, motor, etc 3. RP resistance type temperature fuse, generally low melting point alloy type     3、 Self recovery fuse. This is a kind of fuse which can recover automatically when the current is too high. It belongs to multiple use type and is suitable for overload protection circuit. 1. Plug in self recovery fuse 2. SMD self recovery fuse 3. Laminated self recovery fuse
07-15

Longde electric appliance teaches you how to use thermostat correctly

The use of electric heating system is more and more families, how to save energy has become a concern of many people, in addition to do a good job in building insulation, temperature control is one of the key to energy saving. Some users who have installed electric heating always turn on the thermostat when they need it and turn it off when they go out, thinking that this will save electricity. In fact, it will not only save energy but also consume more energy. So how to use the thermostat to achieve real energy saving? Now let's make up of Longde electric appliance to take you to study.   1. Meeting energy saving? Turn on the thermostat when necessary and turn it off when going out, which will consume energy. The electric heating system is a low-temperature operation system with good heat storage type. It takes a certain time to make the room temperature reach the set temperature after the system is turned on. However, the indoor temperature will not drop rapidly after the system is closed. When the system is turned on again, it also takes a long time to make the temperature rise again. Frequent switching not only can not save energy, but also increase the operating cost of heating system.     In a room that is not commonly used, the temperature can be lowered by a few degrees by the temperature controller. When leaving the room for a long time, the temperature of the temperature controller can be reduced by a few degrees. In the case of long-term absence of people or leaving for a long time, the system can be turned off. However, it should be noted that if there is equipment in the room that is afraid of freezing damage, it is also necessary to open it to a certain temperature to prevent the equipment or pipeline from freezing and cracking.   2. Temperature controller set high temperature, fast temperature rise? Some users feel that the room temperature is low and they need to heat up quickly to set the temperature of the thermostat to the highest. This practice is also wrong. The heating time of room temperature depends on the indoor and outdoor temperature difference and the installed power per unit area of the room. When the installation power and the indoor and outdoor temperature difference are fixed, no matter how many degrees are set, the time for the room to rise to the temperature you need is the same. If the room is now 16 degrees and you want to make the room temperature rise to 18 degrees, in this case, setting the room temperature to 18 degrees or 20 degrees, 25 degrees is the same as heating to 18 degrees. Set as many degrees as you need, or use an intelligent thermostat, which can automatically calculate the opening time of the thermostat in advance.
07-15

How many control modes does the electronic thermostat have

The control methods are generally divided into two types: one is controlled by the temperature change of the object to be cooled, and the other is controlled by the temperature difference of the object to be cooled, and the electronic temperature controller is used. The thermostat is divided into: Mechanical type is divided into: steam pressure type temperature controller, liquid expansion type temperature controller, gas adsorption type temperature controller, metal expansion type temperature controller. Among them, the steam pressure type temperature controller can be divided into: inflatable type, liquid gas mixing type and liquid filling type. This kind of thermostat is mainly used in mechanical type of household air conditioner. Electronic type is divided into resistance type temperature controller and thermocouple type temperature controller.
07-15

What does the temperature control switch use to sense the temperature

Many friends are very interested in what kind of temperature control switch is used to sense temperature! Since it is a jump type temperature control switch, it must have its own temperature sensing system. If there is no good temperature sensing system, there is no way to predict the temperature, which comes from the ground breaking or contact. The principle of the temperature controller is very simple. It is composed of bimetallic pieces. When the temperature reaches a certain height, it will be disconnected or contacted freely. This is also the most basic temperature sensing setting of the temperature control switch. Temperature setting is also the most important point in the whole process. No matter what kind of electric heating equipment is, it needs good temperature sensing. If it can not be well sensed, it indicates that it is a quality problem, which will have a great impact on our normal use.
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