CS232579B1 - Heating element in miniature design - Google Patents

Abstract

The invention relates to a heating element in a miniature design, especially for hand-held electric soldering irons with soldering temperature control, particularly suitable for soldering microelectronic and other integrated circuits, where it is absolutely necessary to maintain the prescribed soldering temperature. An insulated heating wire (1) is wound on a metal housing (2), provided with an additional insulating foil (15), the measuring end of which is attached to the measuring point (6) of the metal housing (2), and its outlet (13) is guided by a ceramic tube (11), which is inserted into the recess (10) of the metal housing (2), and through which also passes the outlet (7) of the metal housing (2), the fixed end (8) of which is secured on the surface of the metal housing (2), and a securing bend (14) is formed on one of the outlets (7) (13) of the heating element.

Description

The invention solves a heating element in miniature version, especially for hand soldering iron with soldering temperature regulation for soldering of electronic circuits, especially microelectronic elements, semiconductors, integrated circuits and microprocessors, where it is absolutely necessary to maintain the prescribed soldering temperature of terminals. semiconductor transitions.

For manual soldering there are miniature soldering irons with soldering tip temperature control, where the temperature control is stepped and is formed by a special magnet placed at the foot of the soldering tip. When changing the temperature it is necessary to replace the solder play, which in common practice causes time losses.

Another known method of control is accomplished by introducing a thermocouple into the shaft of the soldering tip and controlling the temperature by an electronic circuit located outside the soldering iron itself. These soldering irons have a heating element built into the support tube, on which the soldering tip is threaded. Such a design provides good and continuous control of the solder tip temperature, but it does not make it possible to design a sufficiently slim solder tip to be suitable for brazing fine and poorly accessible components, with relatively high power consumption of the miniature soldering iron and high durability of the heater.

The abovementioned drawbacks are remedied by a miniature version of the support element, in particular for soldering temperature-controlled electric soldering irons, which consists in winding on the metal housing an insulated heating conductor provided with an additional insulating foil and the measuring end of which is the measuring point of the metal sleeve and its outlet is led to a paraic tube which is inserted into the recess of the metal sleeve,

232 579 the fixed end is secured to the surface of the metal sleeve, with a locking bend formed at one of the heater outlets *

Creating a heating element by wrapping an insulated heating conductor on a metal housing achieves a very good heat transfer to the soldering tip and allows high performance of the heating element in a miniature design for its long service life · Placing the measuring point on the metal housing face in contact with the soldering tip in its The functional part ensures immediate control responses during the brazing process, which contributes to a fast coupling performance without unnecessarily overheating the brazed components. Insulating foil ensures good energy efficiency of soldering iron. The proposed design is also simple and suitable for sepia production.

The attached drawing shows a heating element in miniature in longitudinal section.

An insulated heating conductor 3 is wound onto the metal casing 2, one end of which is led to the face of the metal casing 2 at the measuring point and the other outlet 13 passes through the groove% of the metal casing 2 through the outer opening 12 into the ceramic tube 11. The soldering tip J is inserted with its shaft 6 into the metal sleeve 2 and its shoulder 2 rests on the measuring point 6 at the front of the metal sleeve 2. The outlet χ of the metal sleeve 2 formed of the same material as the metal sleeve 2 a thermocouple consisting of an insulated heating conductor 11 and a metal sleeve 2 is secured at the fixed end 8 on the outside of the cylindrical surface of the metal sleeve 2j by a ceramic tube 11 at the end of which a locking bend 14 is formed from the outlet J insulating foil 15 »

The metal sleeve 2 with the wound insulated heating wire 1 provides heat to the solder tip shank 2, which by its step 6 abuts the measuring point 4 at the front of the metal sleeve 2. The measuring point 5 senses the temperature of the solder tip 2. The metal housing 2 forms a positive branch of the measuring thermocouple and at the same time serves as a heating resistor. The bend 14 of the outlet 8 of the metal sleeve 2 secures the position of the ceramic tube

Claims (1)

Heating element in miniature version especially for hand-held electric soldering irons with soldering temperature control and temperature-sensitive sensor created by thermoelectric element, characterized in that insulated heating conductor (1), equipped with additional insulating foil (15) is wound on metal housing (2). and whose measuring end is fixed at a measuring point (6) of the metal sleeve (2) and its outlet (13) is guided through a ceramic tube (11) which is inserted into a recess (10) of the metal sleeve (2) and 7) a metal sleeve (2), the fixed end (8) of which is secured to the surface of the metal sleeve (2), a locking bend (14) being formed at one of the heater outlets (7) (13);