SU1128407A1 - Induction heater for heating parts - Google Patents

Abstract

1. INDUCTOR - A TRANSFORMER FOR HEATING DETAILS containing a primary winding and an unclosed water-cooled secondary, made in the form of electrically connected mezdu two parts, one of which is placed inside the primary and filled in the form of two open water-cooled rings, and another wraps itself inside the device. in the form of an open ring and two side disks electrically connected to it with iodine cooling tubes, characterized in that, in order to increase the heating efficiency of the longitudinal and ring joints of cylindrical parts, the secondary rings of the coils placed inside the primary,:, spaced on opposite sides of the primary coil and adjacent to its lateral yoverhnost m, and the ends of each of the rings connected to them extending inside and parallel to the axis of the inductor webs. 2. Inductor transformer according to claim 1, characterized in that the secondary winding is provided with an additional open water-cooled ring adjacent to the inner diameter of the ring enclosing the primary winding outside and installed coaxially with one of the secondary winding rings located inside the primary I and rigidly connected with him peremychki.

Description

1 1 The invention relates to electrotherapy, namely to induction heating devices, and can be used to heat electrically conductive parts in engineering production, instrument making, etc. The inductor transformer for heating cylindrical parts is known, containing primary and secondary cylindrical windings, and the secondary winding consists of two parts, electrically interconnected, one of which is located inside the primary, and the other covers its G1. The disadvantage of this design is low efficiency due to a slightly electromagnetic coupling (the coupling coefficient between the windings does not exceed 0.6 ... 0.7). This necessitates a sufficiently large gap between the windings to provide electrical insulation and the impossibility of introducing the magnetic circuit both between the windings and inside the secondary winding. If both parts of the secondary winding are electrically connected in the face cleaning, the losses in it are increased, and without such a connection, the end surfaces of the primary winding remain open, which reduces the efficiency of the transformer. It should also indicate the complexity of the implementation of the split construction of such a transformer. Closest to the technically proposed is an inductor-transformer for heating parts, containing a primary winding and an unclosed water-cooled secondary, made in the form of two parts electrically connected to each other, one of which is placed inside the primary . The lec, and the other, wraps it outside and is made in the form of an open ring and electrically connected with it two side disks with water cooling tubes 2. However, in the known device the heating of flat parts (edges of welded pipes, joints of cylindrical parts for welding, etc. ) becomes ineffective due to the fact that the current on the inner surface of such a transformer-inductor, which is the active part, flows in one direction along its entire height. The current in the component, the repetition of current distribution in the inductor, cannot 72 provide preferential heating of flat edges or joints, which reduces the overall efficiency (both thermal and electric) of heating. A disadvantage of a particular design of the known device is the difficulty of providing the necessary rigidity while maintaining sufficient electrical strength of the insulation of the bolts tightening both halves of the secondary winding. The invention is an increase in the heating efficiency of the longitudinal and annular joints of cylindrical parts. The goal is achieved by the fact that in an inductor-transformer for heating parts containing a primary winding and an unclosed water-cooled secondary, made in the form of two parts electrically interconnected, one of which is placed inside the primary and made in the form of two unclosed water-cooled rings, and the other wraps it outside and is made in the form of an open ring and two side disks electrically connected to it with water cooling tubes, secondary winding rings placed inside the primary one, once They are carried on opposite sides of the primary winding and are adjacent to its side surfaces, and the ends of each of the rings are connected by bridges passing through them and parallel to the axis of the inductor. The secondary winding of the inductor can be equipped with an additional open-circuit water-cooled ring adjacent to the inner diameter of the ring enclosing the primary winding outside and installed coaxially with one of the secondary winding rings located inside the primary winding and rigidly connected to the jumpers. FIG. 1 shows an inductor-transformer, a general view (section B-B in FIG. 2); FIG. 2 is a section A-A in FIG. one; FIG. 3 is a section BB in FIG. one; in fig. 4, only the active part of the secondary winding is allocated and an example of the use of the proposed device for heating annular joints of pipes is given. The primary winding 1 is a multi-turn disk two-turn coil which is made of a water-cooled rectangular tube. The secondary winding consists of two parts. The part encompassing the primary winding outside is made of an open circular ring 2 with side discs 3 and 4. A part of the secondary winding located inside the primary one is made of water-cooled tubes and contains rings 5 and 6 located on both sides of the primary winding coaxially with it. Rings 5 and 6 are interconnected by jumpers 7 and 8, parallel to the base of the inductor-transformer. The ring 5 is permanently fixed to the water-cooled ring 9. The ring 9 is attached to the upper ring 5 by means of jumpers 10 and 11. To the ring 6 there is an integral disk 12 attached to the ring, to which the fitting 13 is fixed and the fitting 14 is passed through the hole t through the hole in the disk 3. The coils of the primary winding 1 are electrically isolated from each other and from rings 5 and 6. Vyg. 15 and 16 of the primary winding are attached to the inner rings of the lower and upper row and pass through. ring gap of the secondary winding. The terminals are provided with contact strips 17 and 18. The ring 2 is provided with a flange 19, with which the plug-in connection of both parts of the secondary winding is realized. Disks 3 and sleeves with cooling tubes. For cooling the rings 5, 6 and 9 with the corresponding bridges, the feed 14 and drain 13 fittings are provided. From port 14, the water enters the bridge 8, passes through the upper ring 5, bridge 7, bottom / ring 6 and exits through port 13. In the bridge 7 and 8 there are openings that serve to cool the ring 9 and jumpers 10 and 11 Inductor transformer works as follows. The heating piece 20 is disposed with a gap in relation to the part of the secondary winding inside the primary one. The functions of the active induction part of the water are performed by rings 5 and 6, as well as jumpers 7 and 8 (Fig. 4). The high frequency current flowing in the primary winding 1 induces an electromotive force in the secondary winding, under the action of which the current flows in the secondary winding as follows: currents of the same direction flow along the internal surfaces of the outer circular ring 2 and side discs 3 and 4. They are closed on the outer surfaces of the active part of the inductor, i.e. on the surfaces of rings 5 and 6 and jumpers 7 and 8. Thus, a current equal to the sum of currents induced on the inner surfaces of parts 2, 3 and 4 flows through the outer surface of the active part of the secondary winding. The direction of the current in the active part is shown by arrows (Fig. 4). The flow of current in the rings 5 and 6, as well as in the jumpers 7 and 8 in mutually opposite directions, creates additional possibilities for using the proposed device. The currents in the parts directed opposite to the current in the inducing part of the transformer heat up the outer surfaces facing the outer surfaces of the active conductors. If a piece of cylindrical shape is subjected to heating, the direction of the currents in it is the same as when using a known inductor transformer for this purpose. When heating (for the purpose of heat treatment or preheating for welding) joints of cylindrical parts, in particular pipes, the direction of the currents in the parts is opposite, if they are arranged so that rings 5 and 6 are symmetrically located relative to the joint. Due to the proximity effect, currents flowing in opposite directions are drawn onto the edges of the pipes, which improves the thermal state of their heating. If a pipe having a longitudinal joint is placed in the proposed transformer inductor, then the currents in the pipe flow as follows: along the outer surface of the pipe, then along the edges (repeat current direction in jumper 8) then along the back of the pipe in the opposite direction, and further along edges, shake closed again on the back. Due to the flow of current along the edges in opposite directions due to the proximity effect, the current is displaced to the edges, predominantly warming them up, the Offered inductor can also be used for welding hfodolnye seams of pipes. Thus, the proposed inductor-transformer, while maintaining the minimum inductance dissipation.

5,112,8407.

This is explained by the implementation of its second-described advantages, reflecting the primary winding, so that, with all of its extensions, its functional areas cover the primary winding, it possesses capabilities.

L Zhu--

7 Gyyy xyyyy y // Y7

V XX.-X W V W W .. (ptie2

VE

13

:: f

Claims (2)

1. INDUCTOR ^ TRANSFORMER FOR HEATING PARTS, containing a primary winding and an open water-cooled secondary, made in the form of two parts electrically connected together, one of which is placed inside the primary and made in the form of two open water-cooled rings, and the other wraps it outside and is made in in the form of an open ring and two side disks electrically connected to it with water cooling tubes, characterized in that, in order to increase the heating efficiency of the longitudinal and ring joints of the cylindrical of secondary parts, the secondary winding rings located inside the primary: are spaced on opposite sides of the primary winding and are adjacent to its side • Surfaces, and the ends of each ring are connected by jumpers passing inside them and parallel to the axis of the inductor. 2. Inductor-transformer according to π. 1 * characterized in that the secondary winding is equipped with an additional open j water-cooled ring adjacent to the inner diameter of the ring surrounding the primary winding and installed coaxially with one of the rings of the secondary winding located inside the primary * I noy and neper rigidly connected to it slippers.