Electric blankets without temperature control are not only difficult to obtain a comfortable bed temperature, but also have high energy consumption and fire hazards. Electric blankets with bimetal thermostats have improved in terms of energy efficiency and safety, but it is difficult to adjust the temperature. The above disadvantages can be overcome by using a PTC thermistor temperature control circuit. Fiber Optic Cable Channel Assembly
An optical fiber trough is a cable trough for laying soft optical fibers. Material general points: flame retardant engineering plastics, aluminum alloy, steel several. Width is 120mm, 200mm, 240mm, 300mm, 340mm, 400mm, height is generally 100mm. Other sizes can be customized by manufacturers in case of mass purchase. Generally, it is used for wiring in indoor machine rooms.
Classification of optical fiber troughs
1. Plastic optical fiber trough
Plastic fiber groove is a new product developed according to the requirements of high standard machine room construction, absorbing the advantages of foreign products combined with China's national conditions. The groove body and fiber outlet and other accessories are made of high-quality flame retardant materials, good integrity, simple installation, corner corner protection, to ensure that the bending radius of the fiber is greater than 40mm; The fiber outlet is made of flame-retardant plastic and protected with rounded corners. It can be moved freely in the tank to facilitate fiber laying in the appropriate position.
2. Aluminum alloy optical fiber trough
Aluminum alloy fiber groove is designed and manufactured for the various environments and places used in fiber groove, as well as the wishes of customers at home and abroad. It is a new type of fiber groove required by high standard machine room.
The main channel and the column channel are assembled by special aluminum alloy profiles, the surface is chemically treated, and the bottom plate of the channel body is often aluminum plastic plate, which is neat and beautiful. The optical fiber trough can also be separately installed on the cable tray.
Fiber Optic Cable Channel assembly is an essential component of fiber optic networks. It is used to protect and manage fiber optic cables, ensuring that they are properly installed and maintained. This assembly is designed to protect fiber optic cables from environmental factors such as moisture, dust, and temperature changes, which can cause signal loss and degradation.
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1 principle circuit
The electric blanket temperature control circuit is composed of a rectifier circuit and a temperature control circuit. The basic principle is shown in Figure 2.11.1. In the figure, RT1 and RT2 are PTC thermistors, which are used to detect the temperature in different areas, and with RP, C, VD6 constitutes a trigger circuit for the unidirectional thyristor VS. The RP has a preset thermostat value.
When the power is turned on, the mains is directly rectified by the bridge circuit, and then charged to C through RT1, RT2, and RP. When the charging voltage of C reaches a certain value, the V1 is discharged through VD5 and VD6, and the VS is triggered to conduct, and the heating wire RL is electrically heated to enter a temperature rising state. As the temperature of the electric blanket increases, the resistance of RT1 and RT2 increases, the time constant of the charging circuit will gradually increase, the conduction angle of VS will become smaller and smaller, and the heating power of RL will decrease. When the temperature of the electric blanket rises further to a predetermined value, the resistance of RT1 and RT2 will increase stepwise, up to 500KΩ, the conduction angle of VS is approximately zero, and the circuit load current is so small that RL hardly heats up. Then, the electric blanket enters a constant temperature and keeps warm. Conversely, when the temperature of the electric blanket drops below the preset value by about 5 °C, the VS will re-trigger the conduction, and the RL will be electrically heated again. This operation is repeated to achieve the purpose of automatic constant temperature.
Figure: Electric blanket temperature control circuit
2 main components selection
The PTC thermistor should have a Curie temperature of 30 ° C, a normal temperature resistance of 5 KΩ, and a withstand voltage of 500 V or more. VS is selected according to the power of RL. The model selected in this circuit can meet the requirements of general electric blankets. CSelect a polycarbonate film capacitor with good insulation properties.
3 Installation and commissioning
The recommended installation method is to embed two PTC thermistors in the dense part of the heating wire. For example, the center of the foot and waist. In addition, the circuit is directly connected to the mains, and the PTC thermistor and the lead end buried in the electric blanket should have good insulation measures.
A fiber optic cable channel assembly typically consists of a channel, a cover, and mounting hardware. The channel is a long, narrow structure that is designed to hold multiple fiber optic cables. It is usually made of metal or plastic and can be mounted to a wall or other structure. The cover is used to protect the cables from external factors and can be made of a variety of materials, including plastic, metal, or fiberglass.
The mounting hardware is used to secure the channel and cover to a wall or other structure. It typically includes screws, bolts, or other fasteners that are designed to hold the assembly in place. Some fiber optic cable channel assemblies also include cable ties or other devices that are used to secure the cables inside the channel.
Fiber optic cable channel assemblies are used in a variety of applications, including telecommunications, data centers, and industrial environments. They are particularly useful in environments where space is limited or where cables need to be protected from external factors. For example, in a data center, fiber optic cable channel assemblies can be used to organize and protect cables running between servers and other equipment.