DE2014460C - Heating device for conveyor pipes consisting of individual pipe sections - Google Patents

Description

table tubes are heated, through the interior of which can be according to the delivery pipe two or

a plurality of single-phase electrical circuits connected to an alternating current source as shown in FIG. 2 - d. H. Conductors are carried out insulated, whereby the with four, six and eight ferromagnetic tubes - Inside of the ferromagnetic tubes in opposite directions or two or more three-phase circuits flowing currents are induced. 50, wet F i g. 3 - d. H. with a multiple of three,

The principle of using the skin, i.e. heated ferromagnetic tubes with three, six or nine ferromagnetic effects, should be used under tubes.
Reference to FIG. 1 to 3 are explained. It is known that conveyor pipes are in individual

F i g. 1 shows a ferromagnetic tube 1, e.g. B. pipe sections with a unit length manufactured a steel pipe in which an insulated inner conductor 2 55 and mounted. If such delivery pipes are also arranged, which are heated at one end with that of the ferromagnetic pipe, there is a ferromagnetic pipe 1 and at the other end there is naturally a desire to have this ferromagnetic pipe connected to a power source. Via a pipe already in the factory to the pipe section conductor 4, the circuit between the other of the conveying pipes is to be attached, because this causes the end of the ferromagnetic pipe! and the installation is made much easier,
whose terminal of the power source is closed. Accordingly, the aim of the present invention is to

If you create the resistance of the ferromagnetic heating device for individual Rohtabschnit-Rohres 1 with ρ (U cm), the permeability with µ and th existing conveyor pipes, which far denotes the frequency with / (Hz), you get going already in the Factory-made, whereby for the penetration depth S (cm) of the skin effect: 65 the implementation of time-consuming welded joints

, fertilize the ferromagnetic tubes when assembling

S = 5030 I / ^Q (W days is avoided.

| / /// " ■ {> According to the invention this is achieved in that

the ferromagnetic !! Pipes at the seams of the Pipe sections are electrically separated and that the ends of the same pipe section belong ferromagnetic tubes are each connected to one another via electrical conductors.

In general, it appears expedient if the

Order individual pipe sections of the conveyor pipe made of metal and that the ferromagnetic pipes on welded to the pipe sections of the conveyor pipe

through ^a ^ ^V "^ ^d vert) death bushes 10 can bond., ^^^^ yerbindUBgen according to Fig.4

Fig.

are while form of ' ^F '

S. B **, "U - - H ^, 0. OUT

management examples with reference to the F ι g. 4th to 7 will be explained. Show it

F i g. 4 and 5 exemplary embodiments with emphasis circuits according to the invention and

6 and 7 are cross-sectional views of exemplary embodiments with single-phase and double-phase circuits according to the invention.

4 to 7 show ferromagnetic pipes 1, 1 'and 1 "- for example steel pipes - which are fastened to a conveyor pipe 8, for example by welding. Inner _{conductors 2 lead through the ferromagnetic pipes 1} 1'1" , 2 'and 2 ". The Wecfoektrom sources are not shown in the figures. The inner lines 2, 2', 2" form the outward and reverse, 5 flow lines with respect to the current sources.

According to FIG. 4, the pipe sections of the delivery pipe 8 are each connected to one another via flanges 9, In the context of the present invention, the individual sections of the ferromagnetic material are 30 Pipes not interconnected while the den individual sections of the inner conductor 2 and 2 must be connected to one another. As the sections the ferromagnetic. "Pipes 1 and 1 'are separated by the flange 9, 3 flows from the ferromagnetic Pipe 1 via the lines 6.7 of the conveyor Sres 8 to the ferromagnetic tube 1 'a secondary current, which according to FIG. 2 leads to a secondary circuit. Since the delivery pipe 8 is consistently p

is surrounded by an insulating layer 11, is 40 »ι In

no danger of a dense contact-acres where the ^fe

live delivery pipe8 and a generally

NEN provided outer sheath, just like them

; “Figs. 4 and 5 are shown. But bet yourself

direct contact of the conveyor pipe 8 with the outer

outer casing is the leakage that occurs on the outside

current very low because the distance between two

adjacent sections of ferromagnetic

Pipes is usually smaller than 1 m and we that Line paths 6, 7 of the conveying pipe 8 are extremely connected

SS have a small impedance

ji £ isssr

^^ vert) bonding todungsbüchsen., ^^^. "^ yerbindUBgen according to Fig. 4 but also De * ^rim * g £ V-ruse of connec- ts J ^ en- _{Ät β} ^ _o ft as difficult, the- ^ S ^ iST durch Welding electrically with the same * « ^ls P ^ie ^ \ L, however, ferromagnetic pipes ai the sections' = * _{eüsche pipe} connected. ^ "T ^ AUdung of secondary ^{current also} then üu £ ⁿ Λ ~ _We j _S e heat, if the waste

jJJ ^ _{Sections of the} ferromagneti- falls oenacnoa * _{the connecting} socket 1 «

see tubes * """ ^{x is} _{called sin} d which flows along f" Se _re nSagS, chen tubes 1 and 1 'of ^to j ^ns £ ®, ^ L ^ _e in pieces to the outer ^ f ^ fl ^ awietischen tube and appears at serte des ^fe 7 ° ^mag ^ _ächc .. «Förderrohres 8th De: 6 and 7 for the _{dncm piece of the}

»O secondary ^flieli _{R as well} , _on the inside ^fe / ^roma ^ A ^^ ite whereby the generated heat as well as üe γα uu ' _{parts of the} ferromagnetic

larger than that in anaer
see pipes: isi _ _{From the} f _u hrungsförrn of

^{It has} been established that the ° _{9 is} electrically insulated from _{each other}

Proper execution

the »^ /. Steel here

by diesκ ^'1 _{9 geg "nse} ITIG electric Beihreiöuiig the exemplary ühnings- ^ _sbuchsen 10 _arene from IsolierJ ^B _nw. As a rule,

_and connecting bushes

_that part of the secondary current _{is there} , _ne

distribution of currents what

^. ^ ΞλΪ invention not affected however, the prince φ cross-sectional views

The F1 g. 6 unoι β _{rfer invention}

emes tm der He ze-nnciruing ^ ^ _the ^ provided Fordermhres ^ _three- phase heated

«Np« i «g and ^ J jemanoe _{nleiter γ χ} . _through

I J ^ ™ 32 tubes 1, I '. 1 "> being

_ausb Uden.

'^ "" Ibung referred to _n electrically conductive material. Toieillichen design of the

_However, delivery pipes made of jea ^^ j are also _used

Twi the ends of each _{table tube} e together

value ^ ^ ^ ^ _{surface of the} 'must then be connecting conductors

the ^fe " ^on g
Current paths6 'fc,

J ¹¹

like _j invention

e SS

ji £ isssrsr sä ££ rta

Welding and the individual ferromagnetic tubes are turned.

1 sheet of drawings

Claims (4)

0I 1 2 If the conditions of the patent claims are met: ",, _, ^. , _. r> 2S, d> S, l> <f, (2) 1.Heating device for individual pipe Sections of existing conveyor pipes, which with fi: eats the alternating current only on the inside with the help of several on the circumference of the ferromagnetic pipe I, while on its ten ferromagnetic pipes are heated, no potential occurs through the outside Alternating current source at points on the outside of the ferrometallic closed electrical conductor, insulated by tube 1 connected by a conductor, flows, as a result of which there is no current on the inside of the ferro- thus in this conductor,
magnetic tubes in opposite directions, according to Fig. 2, two ferromagnetic tangentially flowing currents are induced and, thereby tubes 1, 1 'are provided, the inner conductor 2, 2 of which is characterized by the fact that the ferromagnetic two single-phase alternating current sources 3, 3 are connected-tubes (1, 1 ', 1 ") are sen at the joints of the pipe. a circuit is a tfechselabschnitte of the electrically separated and that the current source 3, the Innenlerter 2, a ferro-ends of the same pipe section belonging to t ₅ magnetic tubes 1 and 1 connecting short ferromagnetic tubes (1, 1 ', 1 ") each via a closing line 7, a connecting line 5, the electrical conductor (6, 6', 6", 7,7 ', 7 ") are connected to one another ferromagnetic Rohrl, part of a short . closing line 6 and a connecting line 4 gc- 2. Heating device according to claim 1, characterized in that. There is another circuit accordingly characterized in that the individual pipe sections ao from the other AC power source 3, the Inr.endes Conveyor pipe (8) made of metal and that head 2 ', part of a short-circuit line 7, emer the ferromagnetic tubes (1, 1 ', 1 ") on the connecting line S, the ferromagnetic Ruhr Γ, Pipe sections of the delivery pipe (8) are fixed to a part of a short-circuit line 6 and a welded part are. connecting line 4. With two equivalent power 3. Heating device according to claim 1, characterized »5 can circle the connecting lines 4 and 5, characterized in that the individual pipe sections are omitted and the two alternating current sources 3 of the conveying pipe (8) are made of insulating material and 3 'combined into a single alternating current source and that the ends of the the same pipe section. The short-circuit lines (associated ferromagnetic tubes (1, 1 ', 1 ") and 7 are retained, so that a secondary circuit is formed from one another 30 via separate connecting conductors. are connected. According to FIG. 3 can also be three ferromagnetic 4. Heating device ruch one of the claims 1, tubes 1, Γ, I "can be provided, the inner conductors 2, to 3, characterized in that the individual 2 ', 2" are connected to a three-phase alternating current source. A circuit is formed by the 1 ") through connecting sleeves (10) made of insulating 35 an alternating current source 3, the inner line 2, material are connected to each other. Part of the connecting line 5, the short-circuit line 7, the ferromagnetic" Rohrl, Γ and 1 ", a short-circuit line 6 and a connection line 4. Corresponding circuits exist for the 40 AC power sources 3 'and 3 ". When each phase is balanced as shown in FIG The present invention relates to connecting lines 4 and 5 omitted. In this case, however, the heating device for the short-circuit lines 6, 7, 6 ', T, consisting of conveying pipes consisting of individual pipe sections, which remain in place with the aid of several, with three-phase secondary circuits being formed on the circumference of the ferromagnetic 45.