2023-04-21
1.Material: Excellent snap action thermostat switch in the use of all supporting materials except the base, all copper as conductive parts, such as copper terminals, copper rivets, copper static plate, beryllium copper shrapnel, contact base is copper, surface is silver alloy, silver alloy thickness must meet the use of relay contact standards; Other accessories material is also very key, such as the temperature sensing bimetallic sheet, the core of the temperature controller, domestic or imported, imported strip price is high, but the stability is better, the temperature is not easy to drift and longer life, domestic bimetallic strip price is low, poor stability; Base ceramic and plastic manufacturers are different, the use of different formulas, resulting in differences in quality and accuracy, but also affect the temperature controller related technical performance characteristics, in a long time of operation, excellent material can maintain excellent working characteristics, so as to be more stable and effective.
2. Production technology: The performance of the thermostat also depends on the production process, in the production process, each thermostat manufacturers with their own experience to solve the process problems, to do is in the assembly process of these parts, can not miss any process, such as one of the process problems, will lead to the thermostat in the subsequent use of the product quality problems, for example, During the riveting process between contact and static plate or action riveting, the gap or riveting deformation will make the contact resistance of the temperature controller unstable, and the resistance value will increase. In the process of conductive flow, the contact will be easy to melt and stick at high temperature, and the temperature control itself will increase heat leading to failure. Loose riveting terminal, loose cover, slightly cracked shell, too short or too long action rod and other production processes, if not mastered, will cause the failure of the thermostat, these will appear after a period of use, will not be installed can be reflected.
3. Product structure: At present, the snap action temperature control switch on the market has evolved from TOD, and the domestic thermostat manufacturers are imitated. After more than 20 years of development, the snap action temperature controller is a relatively mature product, but the experienced thermostat factory will carry out slight changes on the structure, to make the product more stable, such as changing the assembly of various accessories, copy the list will never imitate the essence of others, Because the precision is the need for experience and customers in the use of abnormal problems to correct.
4. Testing process: High quality snap action temperature switch, there are many detection procedures, in addition to the conventional incoming material detection, is the production process and finished product full inspection, bimetallic sheet full inspection: corresponding to the temperature range of each temperature sensing sheet full inspection; Synchronous full inspection: refers to the consistency of contact closing/closing between the action of bimetallic sheet of each product after temperature sensing and the reset process; Full test of internal resistance: the conductive resistance of the product; High voltage full inspection: product withstand pressure; Insulation testing: consistent with the purpose of high voltage, testing whether the product is cracked in the packaging process resulting in insufficient creepage distance; Full inspection of appearance: in the process of sealing, aluminum cover deformation, virtual riveting, shell cracking, printing and so on; Full check temperature: whether each thermostat operates within the specified temperature;
5. Product certification: High quality snap action thermal control switch manufacturers have a certain certificate, such as China's CQC; American UL/CUL; EU VDE or TUV other countries Korea KC; Japan PSE, these related certificates, is required every year quarterly or annual inspection factory (refers to the production factory, except traders), quality thermostat are in domestic and foreign certification bodies in the supervision of production.
6. Routine test: In addition to the performance test, the routine test during the burn-in test can also show whether a temperature controller is qualified. Such as life test, the whole test process, excellent temperature control longer life, up to tens of thousands of times, or even one hundred thousand times, contacts can also be continuous on-load current - off/off test tens of thousands of times or even one hundred thousand times, switching current test more than one hundred thousand times, salt spray test, drop test, high and low temperature test, searing wire detection and so on, these are the national standards for the use of household appliances, The qualified thermostat must pass.
At this stage, many thermostat factories, price and quality vary, but still can not be separated from the Chinese saying "a penny a goods", the price has been divided into several levels, such as, foreign manufacturers do jump type thermostat, such as Emerson TOD, Sensata and other representatives, the second is the domestic high-grade temperature control, this kind of temperature control cost-effective, product quality and one of the little difference, Third, domestic low-grade temperature control, material is very secondary, such as iron terminals, iron rivets, iron static sheet, stainless steel shrapnel, contact alloy - silver layer thin thickness, technology detection can save province, play a big price war to seize the domestic middle and high grade temperature control market, after the domestic home appliance market evolution over the past 20 years, most home appliance enterprises use this kind of temperature control products, The export of household appliances or domestic OEM foreign household appliances brands basically require complete certification and excellent performance of domestic high-grade temperature control, so the phenomenon of "poor domestic use, good export", domestic low-grade temperature control manufacturers, whenever they find a temperature control manufacturer's improvement or innovation of temperature control products, they will compete to copy. Regardless of whether the innovator has filed a patent or issued a patent, copy and continue to compete with low prices...
