News Center

  • Contact information
  • Phone: 0550-1234567

    Email: 123456789@qq.com

    Address: a certain area of a city of a certain street, a street of a certain number

    MORE>>

Thermal resistance of the structure and type

Current location:Home > News Center > Enterprise News

        According to its structure type to points, thermal resistance [2] have ordinary type, armored type, film type. Common type of thermal resistance by the temperature sensing element (metal Yangsi), stents, lead, protective casing and junction boxes and other basic components. In order to avoid inductance components, thermal resistance wire often used two-wire and wound, made of non-inductive resistance.

        1, temperature sensing element (metal resistance wire)

        Because the platinum resistivity is bigger, and the relative mechanical strength is bigger, usually the platinum silk diameter in (0.03 ~ 0.07) mrn ± 0.005mm. Can be single-layer wound, if the platinum wire is too small, the resistive body can be done small, but the intensity is low, if the platinum wire thick, although the intensity is large, but the resistive volume is large, thermal inertia is also high. As the mechanical strength of copper is low, resistance wire diameter to be larger, generally 0.1mm ± 0.005mm enameled copper wire or wire wrapped around the framework layered, and Tu Bu insulating paint made of. As the copper resistance temperature is low, it can overlap the multi-layer winding, the general multi-purpose double-wound method, that is, two parallel wire winding system, at the end of the two welding head, so the work of current from a thermal resistance wire into, from Another root of the reverse resistance of heat resistance wire, the formation of the two current force to the opposite coil, the magnetic field in the opposite direction, resulting in the mutual cancellation of the inductance, it is also known as no sense around the law. This double-winding method is also conducive to lead the lead.

        2, skeleton

        Thermal resistance is wound on the skeleton, the skeleton is used to support and fixed resistance wire. The skeleton should be made of mica, quartz, ceramics, glass and plastic, which have good electric insulation performance, high mechanical strength, low thermal expansion coefficient and small physical and chemical stability.

        3, lead

        The diameter of the lead wire should be several times larger than the thermal resistance wire to minimize the resistance of the lead to increase the mechanical strength of the lead and connect the reliability of the industrial use of platinum thermal resistance, the general use of lmm silver wire as the lead; for standard platinum Thermal resistance can be 0.3 rnrn platinum wire as a lead; copper heat resistance is commonly used 0.5mm copper wire.

In the framework of a good thermal resistance around the wire, and welding after the lead, in its outside with mica film for protection. The thermal resistance sensor is obtained by inserting the outer protective tube and connecting with the junction box or the outer lead wire.

At present, the production of film-type thermal resistance, which is the use of vacuum coating or paste printing sintering method so that the metal film attached to the high temperature substrate. Its size can be as small as a few square millimeters, can be affixed to the measured high temperature objects, measuring local temperature, with a small heat 窬, fast response characteristics.

       Domestic unified design of industrial platinum thermal resistance at 0 ℃ when the resistance of 25Ω, 100Ω and several other. The indexing numbers are expressed by Pt25, Pt100 and so on. Film-type platinum thermal resistance of 100Ω, 1000Ω, and several other. Similarly, copper resistance at 0 ℃ when the resistance is 50Ω, 100Ω two, sub-degree with Cu50, Cu100 said


Products

Online service
Follow you nearby

Hotline

0550-1234567