CN1079306C

CN1079306C - Three-phase power frequency induction thermally conducting furnace for working non-farrous metal section bar

Info

Publication number: CN1079306C
Application number: CN98126827A
Authority: CN
Inventors: 开洪利
Original assignee: Individual
Current assignee: Individual
Priority date: 1998-12-28
Filing date: 1998-12-28
Publication date: 2002-02-20
Anticipated expiration: 2018-12-28
Also published as: CN1221660A

Abstract

The prevent invention relates to a three-phase power frequency induction diathermanous furnace for processing non-ferrous metal section materials, wherein an inner lining 2 of the prevent invention is made of open type stainless steel thin pipes, a heat-resistant insulating cushion 3 is coated on the outer surface of the inner lining, and a heterotype copper pipe is wound on the insulating cushion by a single layer to form an inductor 1. Three isonym ends of three primary coils of a single-phase separated composite type transformer 4 are respectively connected with the three output ends of a main controller, and the three input ends of the main controller are connected with a three-phase supply. Two isonym ends and two non-isonym ends of L21 and L23 are respectively connected with eight copper sheets 19 of four flexible pipes of the copper pipe, and three iron cores are mutually independent. The present invention has the advantages of high thermal efficiency, convenient maintenance, low cost and small volume.

Description

Three-phase power frequency induction thermally conducting furnace for working non-farrous metal section bar

The invention belongs to electromagnetic induction heating furnace.

The existing copper tube coil that is used to heat the three-phase main-frequency induction diathermic furnace inductor of non-ferrous metal section bar is a multi-lay winding, makes its maintenance difficult.The 2nd, the liner that is heated between workpiece and the induction coil is an insulated pipes used, makes heat transfer efficiency low.The 3rd, the connected mode of three secondary coils of three-phase transformer makes total magnetic flux cancel each other, so the thermal efficiency is lower.

The objective of the invention is to develop a kind of three-phase power frequency induction thermally conducting furnace for working non-farrous metal section bar, this induction diathermic furnace should have thermal efficiency height, characteristics easy to maintenance.

The present invention is made up of inductor, liner, heat-resistant insulation pad, the combined three-phase transformer of single-phase split, pusher, thermocouple and carriage thereof, master controller.Liner adopts opening stainless steel light wall pipe, and promptly the stainless steel tube circumferencial direction can not form the closed-loop path.Heat-resistant insulation pad is coated on the outer surface of liner, inductor is formed on heat-resistant insulation pad by special-shaped copper pipe individual layer is close, the inductor copper pipe evenly is divided into three sections, every section starting end is provided with a water flowing flexible pipe, flexible pipe is connected water inlet pipe and copper pipe, also be provided with a water flowing flexible pipe at every group end, flexible pipe is connected return pipe and copper pipe.Thermocouple and carriage thereof are installed in an end of liner, and thermocouple contacts with an end that is heated workpiece.Pusher is installed in the other end that is heated workpiece.The combined three-phase transformer of single-phase split, master controller all are installed in the casing, three ends of the same name of three primary coils of the combined three-phase transformer of single-phase split connect three outputs of master controller respectively, and three inputs of master controller connect three phase mains one phase respectively.Two ends of the same name of two secondary coils and two non-same polarities of these two secondary coils are connected on the copper sheet of inductor copper pipe; Three iron cores of the combined three-phase transformer of single-phase split are mutually independently.

Being communicated with though the copper pipe of inductor of the present invention is whole, owing to be divided into some groups of sections, and is winding of single layer, can be during maintenance by under the assembling and dismantling, make easy to maintenancely, and maintenance cost reduces.The connected mode of three combined three-phase transformers of single-phase split makes the magnetic flux that they produce strengthen mutually, so the thermal efficiency improves greatly.Moreover liner adopts not sealed tube of thin stainless steel, and making inductor, inboard electrothermal efficiency is higher with to be heated workpiece gap littler, and heat loss is few.The present invention also have to be heated workpiece pollution-free, do not have other raw and auxiliary material consumption, volume little, take up an area of less, cost is low, automaticity is high, realized advantages such as the gradient-heated of workpiece and higher temperature-controlled precision.

Fig. 1 is an overall structure schematic diagram of the present invention, and Fig. 2 is the side view of liner 2, and Fig. 3 is the side view of special-shaped copper pipe, and Fig. 4 is the electrical block diagram of temperature sensor 14.

Embodiment one: present embodiment is made up of inductor 1, liner 2, heat-resistant insulation pad 3, single-phase split combination type transformer 4, pusher 5, thermocouple and carriage 6 thereof, master controller.Liner 2 adopts opening stainless steel light wall pipe, and opening 7 is applied on the whole body of stainless steel tube 2, and promptly stainless steel tube 2 can not form the closed-loop path on its circumference side's direction.Heat-resistant insulation pad 3 adopts asbestos layer to be coated on the whole outer surface of liner 2, and inductor 1 is formed on heat-resistant insulation pad 3 by special-shaped copper pipe individual layer is close, and special-shaped copper pipe 1 is combined as a whole by a round copper pipe 15 and a rectangular solid copper material 16 and forms.The inductor copper pipe evenly is divided into three sections, pacify an intrinsic water flowing flexible pipe 8 at every section starting end, flexible pipe 8 is connected water inlet pipe 17 and copper pipe 1, also is provided with a flexible pipe 8-1 at every group end, flexible pipe 8-1 is connected return pipe 18 and copper pipe 1, all is connected with cooling water in every group of copper pipe 1.Thermocouple and carriage 6 thereof are installed in an end of liner 2, and thermocouple contacts with an end that is heated workpiece 9.Pusher 5 is installed in the other end that is heated workpiece 9.The combined three-phase transformer 4 of single-phase split, master controller all are installed in the casing 10, three primary coil L of the combined three-phase transformer 4 of single-phase split ₁₁, L ₁₂, L ₁₃Three ends of the same name receive three output terminals A of master controller respectively ₁, A ₂, A ₃On, L ₁₁, L ₁₂, L ₁₃Three non-same polarity ground connection.Master controller is made up of A.C. contactor 11, automatic safety device 12.Three input B of master controller ₁, B ₂, B ₃Connect a phase of three phase mains respectively.Three primary coil L ₁₁, L ₁₂, L ₁₃Respectively and then compensation condenser C between the two ends at the whole story ₁, C ₂, C ₃Secondary coil L ₂₁, L ₂₃Two ends of the same name and L ₂₁, L ₂₃Two non-same polarities be connected on the copper sheet 19 at four flexible pipe 8 places of inductor copper pipe 1.L ₂₁Non-same polarity and L ₂₂Non-same polarity link to each other L ₂₂End of the same name and L ₂₃End of the same name link to each other.Three iron core T ₁, T ₂, T ₃Be mutually independently.

Embodiment two: the difference of present embodiment and embodiment one is in order to guarantee inductor 1 operate as normal for a long time, all paste intrinsic temperature sensor 14 that on the equidistance segments of copper pipe temperature sensor 14 is connected with operation control 13.Temperature sensor 14 is selected the JU1A model for use, and 55 ℃ are its contact disconnection operating temperature, and its contact is a normally closed contact.When in a certain section copper pipe clogging being arranged, the relay tip in the temperature sensor disconnects, and passes to operation control 13, so that in time diagnose and keep in repair.Other composition is identical with embodiment one with annexation.

Embodiment three: the difference of present embodiment and embodiment one is to be difficult for blockage phenomenon in order to make in every section of the copper pipe, sets up several groups again and advance return pipe in every section, and general four～six circles are one group.Other composition is identical with embodiment one with annexation.

Claims

1, three-phase power frequency induction thermally conducting furnace for working non-farrous metal section bar, it is made up of inductor (1), liner (2), heat-resistant insulation pad (3), single-phase split combination type transformer (4), pusher (5), thermocouple and carriage (6) thereof, master controller; It is characterized in that liner (2) adopts opening stainless steel light wall pipe, opening (7) is applied on the whole body of stainless steel tube (2); Heat-resistant insulation pad (3) is coated on the whole outer surface of liner (2), inductor (1) is formed on heat-resistant insulation pad (3) by special-shaped copper pipe individual layer is close, the inductor copper pipe evenly is divided into three sections, pacify an intrinsic water flowing flexible pipe (8) at every section starting end, flexible pipe (8) is connected water inlet pipe (17) and copper pipe (1), also be provided with a flexible pipe (8-1) at every section end, flexible pipe (8-1) is connected return pipe (18) and copper pipe (1), all be connected with cooling water in every section copper pipe (1), three primary coil L of the combined three-phase transformer of single-phase split (4) ₁₁, L ₁₂, L ₁₃Three ends of the same name receive three output terminals A of master controller respectively ₁, A ₂, A ₃On, three input B of controller ₁, B ₂, B ₃Connect a phase of three phase mains respectively; Secondary coil L ₂₁, L ₂₃Two ends of the same name and L ₂₁, L ₂₃Two non-same polarities be connected on the copper sheet (19) that four flexible pipes (8) of inductor copper pipe (1) locate; L ₂₁Non-same polarity and L ₂₂Non-same polarity link to each other L ₂₂End of the same name and L ₂₃End of the same name link to each other; Three iron core T ₁, T ₂, T ₃Be mutually independently.

2, three-phase power frequency induction thermally conducting furnace for working non-farrous metal section bar according to claim 1 is characterized in that all pasting intrinsic temperature sensor (14) on the equidistance segments of copper pipe 1, temperature sensor (14) is connected with operation control (13).

3, three-phase power frequency induction thermally conducting furnace for working non-farrous metal section bar according to claim 1 is characterized in that special-shaped copper pipe (1) is combined as a whole by a round copper pipe (15) and a rectangular solid copper material (16) to form.

4, three-phase power frequency induction thermally conducting furnace for working non-farrous metal section bar according to claim 1 is characterized in that three primary coil L ₁₁, L ₁₂, L ₁₃Respectively and then compensation condenser C between the two ends at the whole story ₁, C ₂, C ₃

5, three-phase power frequency induction thermally conducting furnace for working non-farrous metal section bar according to claim 1 is characterized in that setting up several groups again in every section copper pipe (1) advances return pipe, and general four～six circles are one group.