Weak current College】 【air-conditioning compressor protector role and type.

<br> Refrigeration compressor is the air conditioner, refrigerator of key components, known as the "heart". China from the 1980s began to introduce technology and equipment, production capacity has reached about 2000 million units. As in the use process requiring high reliability .and security, to the compressor protection put forward higher requirements. <br> <br> 1 role <br> <br> Protector series in compressor line, timely follow-up compressor temperature change, and on the basis of the current changes, the .compressor to provide accurate and reliable protection. At present in the refrigeration compressor is widely used primarily in the sudden jump double metal protector. It has a simple structure, reliable performance, easy to use, low cost advantages. <br> <br> 2 .type <br> <br> According to the installation methods and functions are the following: <br> <br> 2.1 according to installation, can be divided into two types: <br> <br> 2.1.1 exterior-protection is installed .in the compressor shell sealed terminals. Therefore, the temperature of the induction compressor shell, accuracy, reliability, are relatively, scope of application has certain limitations. However, due to its easy installation and maintenance, low cost, it is generally applied in the .refrigerator compressor and low power (generally less than 1PH power) air conditioner compressor. <br> <br> 2.1.2 buried protector installed in compressor shell cavity (binding in) motor coil or (insert in) sealed terminals. Therefore work accurately, .high reliability and wide (from refrigerator compressor to generally air conditioner compressor are applicable). But because of the installation in the compressor, the requirements of the small size, can adapt to the compressor's internal temperature, high pressure changes, and other harsh environment. .Therefore, on its design and manufacturing and high demands, such as sealing requirements up to 1 × 10-9 standard atmospheric pressure. Currently, widely used in air conditioning compressors. <br> <br> 2.2 according to different functions, can be divided .into three. <br> <br> 2.2.1 overheat Protector for various reasons causing the compressor temperature exceeds its allowed work scope the protector can automatically cut off circuit allows the compressor to stop working. Question to compressor temperature drops to design scope and automatically .close the circuit, so can ensure the compressor in a permitted temperature range, no "burning" or work life. <br> <br> 2.2.2 overload protector ① main role is as an exception, such as the working state of long- .term overload, voltage rise or fall, and the impact of compressor performance or cause the "burning", the protector can design requirements within the prescribed time cut off circuit, the so-called "current characteristics". ② When compressor starting the occlusal or .occurred mechanical clearance time too short for reasons such as, if not timely-rotor cut off circuit that produces the "burning". The protector can under the provisions of the current, within the prescribed period of time (that is, the so-called ."time") cut off circuit to avoid accidents. <br> <br> 2.2.3 thermal overload protection for the Protector set both of these products features into one, so the design of the protective device and associated to high demand, but the .compressor structure simplification, increased reliability, it has been widely used. <br> <br> 3 domestic and foreign production applications <br> <br> 3.1 exterior-protector ① refrigerator Compressor installed protector. The products to United States TI company for the .production of typical products of automated production, mature technology, stable quality. In addition, if Japan YAMADA Corporation. But at the technical level of production equipment, and other aspects are still there are differences. Since the 1980s, China has introduced the refrigerator compressor .protector production line or critical equipment. At the same time, relying on the self development of technical and technological equipment for production, and reach substantial number of manufacturers. After more than ten years of trial and error, is currently in production of technical standards and .product quality also maturing in terms of price, and have a greater advantage. ② air conditioner Compressor installed protector. In domestic production history for ten years, but was unable to form a mass production. Although in recent years a large number of domestic air- .conditioner compressor production lines introduced into production, but the protection is still dependent on imports. At present, the protective device manufacturers are looking at the product, and have input into the development of strength, and there is air conditioning compressor manufacturers use signs. < .br> <br> 3.2 buried protector that product in the domestic research and development for some time, and has accumulated some experience, but for various reasons could not form the mass production. Therefore seriously lagging behind in the air conditioning compressor of localization requirements. .The world's production of the product of a United States Texas Instruments', Japan (strains) students party seisakusho, etc. <br> <br> 4 new protector describes as refrigeration compressor production, to the protector also put new demands, and there are .some unique features of the protective device, to better meet the needs of the compressor production. <br> <br> 4.1 meltable not reset protector in General, the protector can that compressor from destruction, but the following occurs when it cannot achieve the protection .objective: ① when certain permanent error, such as a compressor machine biting, and the protector is over their working life. ② due to frequent failure protector over working life. ③ as protectors of their own quality issues cannot be disconnected. The above example does .not force cut off circuit will occur more accidents that may lead to damage of compressor explosion safety accident. Meltable (exterior style and buried) protector of occurs to better meet this requirement. The protective device in such a situation, according to the specific design, .permanent circuit breaker, which is equivalent to "fuse" function, so that the compressor is reliable protection, avoids the compressor "explosive" accidents. The product is about to get one after 1997, promotion and application of good results. <br> < .br> 4.2 receivedPlug in the submerged protector has buried protector mostly to binding type attached to the motor stator windings to accurately sense the temperature changes, but the installation extremely inconvenient for compressor automatic line production, costs are higher. In order to improve the situation, .a direct plug in sealed terminals on the patch-protector better solve the above problem. This protector induction is compressor discharge temperatures, such as integrated with exterior installation convenience, while at the same time have buried the reliability of the work, the cost is relatively .low. <br> <br> 4.3 thermal overload functions of submerged protector overheating and overload protector General in exterior-in the earlier application, and buried protector past generally only have overloaded function, and overtemperature protection is provided by the appropriate protector. Although the .functions are distinct, but reduced compressor reliability, increased costs, as a result, the current design of the application of the thermal overload. With the inverter type air conditioning compressors, the protector of requirements also vary. For example, you only need to provide .over-temperature protection features of the protector. This protector has exterior style, patch buried, fastening and buried, and other forms, but from the actual situation, using patch buried should be more reasonable and effective way. <br> <br> It .should be pointed out that you have installed the buried protector of compressor, due to the operating voltage is too high or too low, the starting time is too short, and so on clearance exception working conditions have a reliable (double) protection. In this .sense, the air conditioner manufacturer if this is to protect the compressor for voltage detection, starting clearance time setting, and other functions of the setting is not necessary. <br> <br> 5 conclusions <br> <br> To sum up, .in the selection of the protective device, if the protection of the performance considerations, the use of embedded protector; but from the economy and ease of maintenance, exterior-protection is still there. Therefore, if the existing exterior-protection for design improvements, .the protectors, is very possibility and necessity, and it will be accepted by the market. <br> <br> <br> <br>.