On June 5th, 21 cities such as Beijing and Qingdao jointly issued consumer warnings. They should be alert to the large number of air-conditioning brackets that are “overaged†and cause outdoor machines to fall and hurt. The air-conditioning brackets installed for more than 5 years should be actively repaired or replaced. The reporter found in the interview that the air-conditioner outdoor unit brackets in most of the old districts of Jiaozhou have been rusty, but few citizens maintain or replace the brackets of the outdoor units. The staff of the Consumer Protection Committee of the Jiaozhou Industrial and Commercial Bureau reminded that the air-conditioning brackets for more than 5 years should be taken for maintenance.
Air conditioning bracket rusty
On June 11, the reporter visited several communities in Jiaozhou City. Most of the external walls of the newly built residential buildings in the new urban area were reserved with concrete platforms for air-conditioner outdoor units. Most of the citizens installed the air conditioners to preset positions. However, in the residential area of ​​the old city, most of the air-conditioner outdoor units are directly fixed on the tripod on the wall. Most outdoor units and brackets have long been rusty. Other households, although the air conditioner is new, the brackets, The guardrail has been rusted very seriously. Even some brackets are also responsible for “side jobsâ€, such as drying clothes, and some households put discarded flower pots on the outdoor unit. The huge outdoor unit is suspended in the air by a few rusty triangles, which is worrying.
There are hidden dangers, most citizens do not know
In the joint consumer warnings issued by 21 city associations and rights defending units, it was pointed out that due to the lack of uniform air-conditioning bracket installation specifications, the quality of air-conditioning brackets on the market was uneven. Some brackets were made of inferior steel or scrap steel materials, and the carrying capacity was obviously insufficient. Some manufacturers are shoddy, resulting in easy rusting of the brackets, posing a hidden danger to consumers' personal and property safety. During the visit, the reporter found that most of the citizens did not know about it.
"The brackets are all metal, very strong." Ms. Ma, who lives in the teacher's new village, told the reporter that although the bracket of the outdoor unit is a bit rusty, the air conditioner is fine, the metal bracket is not going to matter, never thought about checking it. new.
"Although the bracket is also found to be rusty, it does not affect the use of air conditioners." Mr. Guo, who lives in Huayun City, told reporters that his home air conditioner has been used for almost 8 years. After discovering that the bracket is rusty, he thought about changing it, but It costs nearly 100 yuan and it will always work. Afterwards, the reporter randomly interviewed 20 citizens on the street. Most citizens did not know that the damaged air conditioner outdoor unit bracket should be repaired and replaced. Only one citizen said that he had just replaced a new bracket for the outdoor unit at home, but for air conditioning. The life of the outdoor unit bracket is not known.
Proactively overhaul for more than 5 years
For the issue of over-time service of the air-conditioner outdoor unit bracket, the reporter consulted the Jiaozhou Industrial and Commercial Bureau. "Now most consumers in the process of use usually only care about whether the air conditioner can be used, and ignore the life of the outdoor bracket of the air conditioner." Director Lu of the Consumer Protection Bureau of Jiaozhou City Industry and Commerce Bureau told reporters that the maintenance of the air conditioner outdoor unit bracket At present, there is still a legal gap. Under normal circumstances, the bracket of the air conditioner outdoor unit is not within the scope of “three guaranteesâ€, but if there is a fall event, the consumer has the right to request compensation from the manufacturer.
“The most important thing is for consumers to improve their safety awareness.†Director Lu told reporters that before using air conditioners, it is necessary to carefully check the firmness of the outdoor unit bracket of the air conditioner, and tighten the screws in time. For installation time of more than 5 years, the outdoor unit bracket should be actively repaired or replaced to prevent the bracket from rusting and loosening and causing the outdoor unit to fall. For example, when the air conditioner manufacturer does not provide the bracket to the consumer during the installation, the consumer should not look for the “zero-working†installation company during the installation.
It is understood that there are clear regulations for the safe use of household appliances, but there is no standard for the age of air conditioner outdoor unit brackets. In April 2012, China Household Electrical Appliances Service Maintenance Association issued the "Specifications for the Installation of Outdoor Units for Air Conditioners", which made specific provisions on the thickness, rust resistance, fastener specifications and bracket inspection specifications of the brackets.
Choose a bracket to see the material
The "Specifications" stipulates that the material used for the bracket must be angle steel or galvanized steel sheet of 3 mm or more; the load capacity of the air conditioning bracket cannot be less than 4 times the self-weight of the air conditioner unit; the service life must not be lower than the air conditioner itself for 10 to 12 years. The service life, etc.; in addition to the hard requirements of strength, the specification also requires that the surface of the air-conditioning bracket must be rust-proof, etc., but the standard is not mandatory.
The reporter dialed the Haier and Hisense air-conditioning service hotline in the name of ordinary consumers. Both companies indicated that they can provide replacement services for air-conditioner outdoor machine brackets, but they must charge according to different materials of different brackets. According to the deer manager of Jiaozhou Yidian Electric Appliance Store, there are mainly three kinds of materials for air conditioner outdoor unit brackets on the market: one is ordinary angle steel material, generally requires thickness greater than 3 mm, and the safe use period is generally 5 to 7 years; the second is anti-rust ability. Strong galvanized steel sheet, generally required thickness greater than 2.5 mm, safe use period is generally 7 to 10 years; third is aluminum galvanized steel sheet or stainless steel material with super anti-rust ability, generally required thickness greater than 2 mm, safe use period It is 10 to 15 years. Deer manager told reporters that as a support for the outdoor unit of the air conditioner, consumers should pay attention to timely replacement, and must choose according to the weight of the air conditioner when purchasing.
A vector inverter, also known as a variable frequency drive (VFD) or adjustable speed drive (ASD), is an advanced power electronic device used to convert direct current (DC) power into alternating current (AC) power. It operates by employing complex control algorithms and sophisticated power electronics to regulate the frequency, voltage, and phase of the AC output waveform.
Vector inverters are widely used in various industries and applications due to their ability to provide precise control over the speed and torque of AC motors. By adjusting the frequency and voltage of the AC output, vector inverters can effectively regulate the motor's rotational speed, enabling smooth acceleration, deceleration, and precise positioning. This makes them essential in applications where precise control over motor speed and torque is required, such as industrial machinery, robotics, HVAC systems, and electric vehicles.
One of the key features of vector inverters is their ability to provide vector control, also known as field-oriented control (FOC). Vector control allows for independent control of the motor's magnetizing flux and torque, resulting in improved motor performance and efficiency. By accurately adjusting the motor's magnetic field and torque components, vector inverters can minimize energy losses, reduce motor heating, and enhance overall system efficiency.
In addition to motor control, vector inverters offer a range of advanced features and protection mechanisms. They typically include built-in functions for fault detection, overcurrent protection, overvoltage protection, and thermal protection, ensuring safe and reliable operation of the system. Furthermore, many vector inverters support communication protocols such as Modbus, Ethernet, and Profibus, facilitating integration with supervisory control systems and enabling remote monitoring and control.
Vector inverters are also extensively used in renewable energy systems, such as wind turbines and solar photovoltaic (PV) systems. They play a crucial role in converting the variable DC power generated by renewable sources into stable and grid-compatible AC power. By efficiently tracking and regulating the power output, vector inverters enable optimal power harvesting from renewable sources while ensuring grid stability and compliance with grid codes.
Overall, vector inverters are versatile devices that provide precise and efficient control over AC motors, making them indispensable in a wide range of industrial, commercial, and residential applications. With their advanced features, protective mechanisms, and compatibility with renewable energy systems, vector inverters contribute to enhanced energy efficiency, improved system performance, and sustainable energy utilization.
Power electronics, DC to AC conversion, Frequency control, Voltage regulation, Phase synchronization
WuXi Spread Electrical Co.,LTD , https://www.vfdspread.com