PL103832B1

PL103832B1 - WIRE HEATING ELEMENT

Info

Publication number: PL103832B1
Application number: PL18003075A
Authority: PL
Priority date: 1975-04-29
Filing date: 1975-04-29
Publication date: 1979-07-31

Description

Przedmiotem wynalazku jest drutowy element grzejny. Wynalazek ma zastosowanie w oporowych piecach laboratoryjnych lub przemyslowych, a zwlaszcza do dlugoczasowych procesów termicz¬ nych hodowli monokrysztalów trudnotopliwych me¬ tali np. Pt, Pd, V, Zr, Cr oraz w procesach rekry¬ stalizacji trudnotopliwych metali.The subject of the invention is a wire element heating. The invention is applicable to thrusters laboratory or industrial furnaces, and especially for long-term thermal processes of refractory metal single crystals such as Pt, Pd, V, Zr, Cr and in recycle processes stabilization of refractory metals.

Znane sa elementy grzejne do pieców wykonane w postaci odcinków drutów grzejnych polaczonych równolegle i umocowanych do dwóch metalowych podstaw, do których doprowadzone jest napiecie.Heating elements for ovens made are known in the form of sections of connected heating wires parallel and attached to two metal ones the bases to which the tension is applied.

Podstawy te sa rozmieszczone na przeciw siebie.These bases are located opposite each other.

Pomiedzy podstawami usytuowana jest komora grzejna pieca.There is a chamber between the bases heating of the furnace.

W znanym rozwiazaniu podstawy wraz z dopro¬ wadzeniami napiecia zasilajacego umiejscowione sa po obu stronach drutu grzejnego.In the known solution, the basis together with the the supply voltage points are located on both sides of the heating wire.

Element grzejny wedlug wynalazku wykonany jest w postaci szeregu odcinków drutów grzejnych polaczonych równolegle poprzez zamocowanie do dwóch podstaw stanowiacych jednoczesnie dopro¬ wadzenia napiecia oraz umiejscowionych jedno¬ stronnie wzgledem elementu grzejnego. Odcinki drutów grzejnych spiete sa miedzy soba oraz wy¬ giete w ten sposób aby ich czesci skrajne przecho¬ dzily wzdluz komory grzejnej pieca natomiast czes¬ ci srodkowe zgodnie z krzywizna poprzeczna pieca.The heating element is made according to the invention it is in the form of a series of sections of heating wires connected in parallel by attaching to two bases which at the same time constitute putting tension and localized ones side to the heating element. Episodes the heating wires are tied between themselves and together bent in such a way that their outermost parts are stored they ran along the heating chamber of the furnace while part of the c and center in accordance with the transverse curvature of the furnace.

Element grzejny wedlug wynalazku zapewnia zwiekszenie trwalosci pieca poprzez wyeliminowa¬ lo nie w obszarze grzejnym ceramiki jako materialu konstrukcyjnego.The heating element according to the invention provides increasing the durability of the furnace by eliminating lo not in the ceramic heating area as a material constructional.

Jednostronne mocowanie elementu grzejnego upraszcza konstrukcje pieca i redukuje niekorzystne wplywy rozszerzalnosci klinowej metalu grzejnego pod wplywem temperatury. Ksztaltowanie drutu grzejnego wedlug wynalazku ulatwia stosowanie wolfranu, który zapewnia wysoka temperature pra¬ cy i stosunkowo niski stopien parowalnosci. Zasto¬ sowanie metalowej obejmy i pólobejm usztywnia konstrukcje i zwieksza jej mechaniczna stabilnosc.One-sided fastening of the heating element simplifies the design of the furnace and reduces disadvantages effects of wedge expansion of heating metal influenced by temperature. Wire shaping according to the invention, it is easy to use tungsten, which provides a high work temperature and a relatively low degree of evaporation. Applied the fitting of the metal clamp and the half-clamp are stiffening structures and increases its mechanical stability.

Wynalazek jest objasniony w przykladzie wyko¬ nania odtworzonym na rysunku, na którym fig. 1 przedstawia widok elementu grzejnego z boku w przekroju, a fig. 2 — widok elementu grzejnego od dolu.The invention is illustrated by the working example the dish reproduced in the drawing in which Fig. 1 shows a side view of the heating element a sectional view, and Fig. 2 is a view of a heating element from the bottom.

Element grzejny pieca wykonany jest z drutu lub preta wolframowego. Dla temperatur pracy poni¬ zej 2000°C obejma 4 i pólobejmy 5 wykonane sa z molibdenu lub tantalu. Dla temperatur pracy po¬ wyzej 2000°C obejma i pólobejmy wykonane sa rów¬ niez z preta wolframowego.The heating element of the furnace is made of wire or tungsten rod. For operating temperatures below at 2000 ° C, clamp 4 and half-clamps 5 are made from molybdenum or tantalum. For working temperatures after above 2000 ° C, the clamp and half-clamps are also made not from tungsten rod.

Drutowy element grzejny 1 posiada na swoich koncach nakladki 2 i przymocowany jest do dwóch metalowych podstaw 3 stanowiacych pólpierscienie.The wire heating element 1 has on its own ends of the overlay 2 and is attached to two metal bases 3 constituting half rings.

Druty grzejne prowadzone sa pionowo a w czesci dolnej wygiete sa w luki odpowiadajace krzywiz- nie komory grzejnej. Poszczególne druty grzejne sa spiete w czesci dolnej obejma 4 w ksztalcie pól- 103 832103 832 pierscieni. Pólobejmy 5 mocowane sa elementami podtrzymujacymi 6 w postaci pretów do podstaw 3.The heating wires run vertically and partially bottom are bent into gaps corresponding to the curves not the heating chamber. The individual heating wires are The clamp 4 in the shape of a half 103 832 103 832 rings. Half-shells 5 are fastened with elements supports 6 in the form of bars for bases 3.

Claims

Patent claims

1.Wire heating element, consisting of sections of heating wires connected in parallel, attached at both ends to two metal bases, characterized in that the bases (3) are placed on one side of the sections of heating wires (1), the ends of which are fixed to are together with the covers (2) to these bases (3), the individual sections of the heating wires (1) are bent in such a way that the extreme parts of these sections are positioned along the heating chamber of the furnace and the central parts are bent according to the transverse curvature of the heating chamber of the furnace, while all sections of the heating wires (1) are fastened in the lower part of the clamp (4) and in the middle part by half-clamps (5), both the clamp and the half-clamps are made of refractory metal.

2. The wire heating element according to claim 1, characterized by the fact that the half-shells (5) are connected by the supporting elements (6) through insulating caps (7) to the bases (3) or to the radiation screens. 7 3 Fiq.1103 832 F / e. 2