SI9400343A2

SI9400343A2 - Electric heater

Info

Publication number: SI9400343A2
Application number: SI9400343A
Authority: SI
Inventors: Pirc Rajko; Stor Slavko; Barboric Alojz; Vogrinec Vasja; Marovt Ivan
Original assignee: Gorenje Aparati D O O; T T E Tovarna Tehtnicnih Eleme
Priority date: 1994-09-02
Filing date: 1994-09-02
Publication date: 1996-04-30

Abstract

Električno grelo, prednostno za pečice štedilnikov, rešuje problem, kako preprečiti okvare grela zaradi sčasoma med uporabo ekspandirajoče izolacijske plasti, kot posledice razpadanja veziva v njej, in ki preprečuje odvod toplote z grela, zaradi česar se osni raztezek grelne spirale tako poveča, da mehansko poškoduje njen nosilec in zaščitni ovoj. Grelo je izvedeno iz bombirane plošče (1), v kateri je ob robu izveden žleb (9) za zunanjo zanko (8) spirale (2), ter v srednjem polju plošče (1) z njo zaporedno vezane notranje zanke (10), ki leži v žlebu (11), ki omogoča razporeditev spirale (2) v različnih dolžinah za dosego različnih toplotnih moči grela. Žlebova (9 in 11) sta na lokastih odsekih (12) širša, da omogočata osni raztezek spirale (2) med segrevanjem in zagotovitev prekritja spirale (2) s perlami po vsej njeni dolžini natančno do električnih kontaktov (13) ne glede na njene proizvodne tolerance v serijski proizvodnji.Electric heater, preferably for cooker ovens, solves the problem of how to prevent heating failures due to the use of expanding insulation over time layers, as a result of decay of the binder in it, and which prevents heat from being removed from the heater, causing it to the axial elongation of the helix increases so mechanically it damages its carrier and the protective sheath. Grelo is made of a bombardment plate (1) in which it is at the edge a groove (9) for the outer loop (8) of the coil (2), and in the middle field of the plate (1) is connected in series with it an inner loop (10) lying in a groove (11) that allows arrangement of spiral (2) in different lengths to reach different heat output of the heater. The grooves (9 and 11) are at arched sections (12) wider to allow axles elongation of the coil (2) during heating and provisioning covering the spiral (2) with beads along its entire length accurate to electrical contacts (13) regardless of its production tolerances in batch production.

Description

1. Gorenje Gospodinjski aparati, d.o.o.,1. Gorenje Home Appliances, Ltd.,

2. T.T.E., Tovarna tehničnih elementov, d.o.o.2. T.T.E., Technical Element Factory, d.o.o.

Električno greloElectric heater

Predmet izuma je električno grelo, ki je prednostno namenjeno za pečice štedilnikov.The subject of the invention is an electric heater, which is preferably intended for cooker ovens.

Tehnični problem, ki ga rešuje pričujoči izum je v tem, kako izdelati tako električno grelo za pečice v štedilnikih, na katerega ne bo kvarno vplival sčasoma povečan volumen pod njim nameščene toplotne izolacije in ki bo omogočal iz istih osnovnih delov sestavo različno močnih grel, ter zagotavljal enstavno montažo.The technical problem solved by the present invention is how to make such an electric oven heater in the cooker, which will not be adversely affected by the increased volume underneath the thermal insulation installed under it, and which will allow the composition of differently heated heater from the same basic parts, and provided single-piece assembly.

Znano je, da vezivo toplotne izolacije v pečici štedilnika sčasoma razpade, zaradi česar se poveča volumen izolacije in se pritisne ob grelo. Takemu segretemu grelu se s tem zmanjša prosta površina za oddajanje toplote. Na tem mestu se grelo pregreje in tudi poškoduje okoliški emajl. Ker so praviloma ta grela cevna, se preveliki raztezki zaradi previsoke temperaure pregretega grela odražajo v čestih nepopravljivih mehanskih okvarah.It is known that the binder of thermal insulation in the cooker oven breaks down over time, causing the insulation volume to increase and press against the heater. Such a heated heater reduces the free surface area for heat transfer. At this point, the overheating heats up and also damages the surrounding enamel. Because these heaters are generally tubular, excessive elongation due to overheating of the overheated heater results in frequent irreversible mechanical failures.

Zaradi zmanjšanja stroškov porizvodnje tudi obstaja potreba po taki konstrukciji grela, ki bo omogočala izdelavo po moči različnih grel iz istih osnovnih sestavnihIn order to reduce the cost of production, there is also a need for such a heater design that will allow the production of different heater outputs from the same basic components

24024-l/D14-XI-94.Vr.24024-l / D14-XI-94.

elementov. Sedanja tovrstna cevna grela se izdelujejo po posameznih tipih.elements. Current pipe heaters of this type are manufactured by type.

Zaradi predvidene serijske montaže seveda mora biti grelo tako izvedeno, da olajša in pospeši montažo.Due to the intended serial assembly, the heater must of course be designed to facilitate and speed up the installation.

Opisani tehnični problem je rešen z novim grelom po izumu tako, da je na posebno konkavni in ožlebljeni plošči kot nosilnem elementu grelnega elementa v navedenih žlebovih nameščena perlana spirala. Konkavnost podeli plošči togost pri sobni in povišani temperaturi. Žlebovi so tako speljani, da tvorijo več različno dolgih zank. Glede na potrebno toplotno moč grela speljemo perlano spiralo po ustrezni zanki.The described technical problem is solved by the new heater according to the invention by placing a pearl spiral on a specially concave and grooved plate as a supporting element of the heating element in said grooves. The concavity gives the board rigidity at room and elevated temperatures. The grooves are so aligned that they form several differently long loops. Depending on the required heat output of the heater, the pearl coil is driven along the appropriate loop.

Zaradi segrevanja spirale, se segreta perlana spirala lahko razširja po lokastih odsekih žleba, ki so razširjeni, da omogočajo neoviran osni raztezek spirale z odmikom v širšem žlebu.Due to the heating of the spiral, the heated pearl of the spiral can be extended over the arched sections of the groove, which are expanded to allow unobstructed axial elongation of the spiral with a recess in the wider groove.

Spirala je fiksirana v žlebovih z jezički, ki so tako široki, da prekrivajo vsaj dve sosednji perli, da v slučaju pošodbe ene izmed z jezičkom stikajočih se perl, spirala ne more priti v neposreden kontakt s pločevino. V serijski proizvodnji je pričakovati tako toleranco dolžine perlane spirale, da variira število perl na spirali za do dve perli. Z razporeditvijo perlane spirale po širših lokih žlebov, kompenziramo različne dolžine spirale zaradi zadostitvi predpisu, da mora biti vsa spirala izolirana s perlami.The coil is fixed in grooves with tabs that are so wide that they cover at least two adjacent beads that in the event of damage to one of the bead-contacting beads, the coil cannot come into direct contact with the sheet. In batch production, such a tolerance of the length of a pearl coil is expected to vary the number of pearls per coil by up to two beads. By arranging the pearl spiral over the wider arches of the grooves, we compensate for the different lengths of the spiral due to the requirement that all spiral be insulated with beads.

Podrobneje bo bistvo izuma pojasnjeno v nadaljevanju z opisom dveh izvedbenih primerov in priloženih risb, na katerih kaže sl. 1 tloris plošče po prvem izvedbenem primeru, sl. 2 vzdolžni prerez iste po črti II-II s sl. 1, sl. 3 prečni prerez iste po črti III-ΠΙ s sl. 1, sl. 4 detajl A s sl. 2 v povečanem merilu, sl. 5 detajl B s sl. 2 v povečanem merilu, sl. 6 čelni pogled srednjega dela plošče s priključnim elementom in sl. 7 tloris plošče po drugem izvedbenem primeru.The essence of the invention will be explained in more detail below with the description of two embodiments and the accompanying drawings, in which FIG. 1 is a plan view of the panel according to the first embodiment, FIG. 2 is a cross-sectional view taken along line II-II of FIG. 1, FIG. 3 is a cross-sectional view taken along line III-ΠΙ of FIG. 1, FIG. 4 is a detail A of FIG. 2 is an enlarged scale, FIG. 5 is a detail B of FIG. 2 is an enlarged scale, FIG. 6 is a front view of the middle part of the panel with the connecting element and FIG. 7 is a floor plan according to another embodiment.

24024-l/D14-XI-94.Vr.24024-l / D14-XI-94.

Prvi izvedbeni primerThe first embodiment

Električno grelo, prednostno za pečice štedilnikov, je v osnovi izvedeno iz nosilne plošče 1, perlane spirale 2 in priključnega elementa 3. Plošča je v osnovi pravokotne oblike in bombirana, da doseže togost v hladnem in ogretem stanju. V sredini ene stranice plošče 1 je izveden odprt kratek podaljšek 4, ki ima v preseku obliko nizke in široke črke U s krajšim izsekom 5 prečnega kraka na prostem koncu. V izseku 5 prostega konca podaljška 4 je nameščen priključni element 3 tako, da tečeta stranska robova 6 izseka 5 v njegovih vzdolžnih žlebovih 7, ter sta robova 6 na koncu zapognjena, da zavarujeta element 3 pred izpadom. Iz elementa 3 vodita po žlebastem podaljšku 4 oba konca spirale 2 tako da tvorita zanko 8, ki leži v žlebu 9, potekajočem ob robu plošče 1, pri čemer je na enem odseku, prednostno na sredini obrobne stranice nasproti podaljšku 4 usmerjen proti sredini plošče z notranjo zanko 10, potekajočo v žlebu 11, ki ima obris enakokrakega trapeza z dvema, med seboj vporednima krajšima osnovnicama 11’.The electric heater, preferably for the cooker ovens, is basically made of a support plate 1, a pearl spiral 2 and a connection element 3. The plate is basically rectangular in shape and bombed to achieve rigidity in cold and warm conditions. In the middle of one side of panel 1, an open short extension 4 is made, which has the shape of a low and wide letter U in cross section, with a shorter section 5 of the crossbar at the free end. In the section 5 of the free end of the extension 4, the connection element 3 is arranged so that the lateral edges 6 of the section 5 extend in its longitudinal grooves 7 and the edges 6 are bent at the end to secure the element 3 from failure. From the element 3, the groove extensions 4 are guided by the two ends of the helix 2 so as to form a loop 8 lying in the groove 9 extending along the edge of the plate 1, in one section, preferably in the middle of the peripheral side opposite the extension 4, towards the center of the plate with an inner loop 10 extending into a groove 11 having the outline of an equilateral trapezoid with two, shorter parallel bases 11 '.

Vsa oglišča in stičišča ravnih odsekov obeh žlebov 9 in 11 so poudarjeno zaokrožena, pri čemer so lokasti odseki 12 srpaste oblike, t.j. da se njih širina od prehoda iz ravnega odseka proti sredini enakomerno povečuje in ponovno zmanjšuje proti prehodu v naslednji raven odsek. Ti razširjeni lokasti odseki 12 omogočajo temperaturno raztezanje perlane spirale 2 in tudi dolžinsko prireditev spirale 2 pri montaži tako, da je vsa spirala 2 izolirana s perlami natančno do priključnih kontaktov 13, izvedenih v priključnem elementu 3.All the angles and intersections of the straight sections of the two grooves 9 and 11 are markedly rounded, with the arched sections 12 being of a sickle shape, i.e. that their width increases steadily from the transition from the straight section to the center and decreases again towards the transition to the next straight section. These extended arched sections 12 allow for the thermal expansion of the pearl coil 2 and also the length adjustment of the coil 2 during assembly such that all coil 2 is insulated with beads exactly to the terminal contacts 13 made in the connecting element 3.

Perlana spirala 2 je fiksirana v žlebovih 9 in 11 z jezički 14, ki potekajo v enakomernem razmiku ob žlebovih 9 in 11, pri čemer je vsak jeziček 14 širši od 1,4 širine vidnega dela posamezne perle 15.The bead 2 is fixed in grooves 9 and 11 with tabs 14 extending at regular intervals along grooves 9 and 11, each tab 14 being wider than 1.4 the width of the visible portion of the individual bead 15.

Ker je grelo nameščeno v pečici v posebnih vodilih tik nad toplotno izolacijsko plastjo A, je sprednji prečni rob 16 plošče 1 izveden tako, da zgornja ploskev 15 plošče 1 tvori z navidezno tangento T na priležni žleb 9 kot a = 30 do 60°. S tem je zagotovljen neoviran potisk plošče v času montaže v pečico , ne da bi se rob 14 zadeval v izolacijsko plast A, ki leži pod ploščo 1.Because the heater is mounted in the oven in the special guides just above the thermal insulation layer A, the front transverse edge 16 of the plate 1 is formed so that the upper surface 15 of the plate 1 forms with the apparent tangent T on the adjacent groove 9 as a = 30 to 60 °. This ensures that the plate is pushed freely at the time of installation in the oven, without the edge 14 extending into the insulation layer A, which lies below the plate 1.

24024-l/D14-XI-94.Vr.24024-l / D14-XI-94.

Drugi izvedbeni primerAnother embodiment

Grelo po drugem izvedbenem primeru je v osnovi izvedeno enako kot po prvem izvedbenem primeru s ploščo 1, perlano spiralo 2 in priključnim elementom, ki ni prikazan na sliki, pri čemer so ti elemetni izvedeni sami po sebi in v medsebojni povezavi enako kot pri prvem izvedbenem primeru.The second embodiment is essentially the same as the first embodiment with plate 1, pearl spiral 2 and a connecting element not shown in the figure, wherein these elements are designed by themselves and interconnected in the same manner as in the first embodiment case.

Bistvena značilnost grela po drugem izvedbenem primeru je izvedba žlebov 9 in 11 za spiralo 2. Žleb 9 je izveden ob robu plošče 1, medtem ko drugi žleb 11, ki izhaja iz enega ravnega odseka žleba 9, tvori znotraj zanke žleba 9 obliko pravokotnika z vsaj enim dodatnim prečnim žlebom 18 in več nanj pravokotnimi žlebovi 19, pri čemer so vsa stičišča in oglišča ravnih odsekov žlebov 9, 11, 18 in 19 izvedena s poudarjenimi lokastimi odseki 12, ki so enako oblikovani in z istim namenom kot pri prvem izvedbenem primeru.An essential feature of the heater according to the second embodiment is the design of the grooves 9 and 11 for the spiral 2. The groove 9 is made at the edge of the plate 1, while the second groove 11, arising from one straight section of the groove 9, forms within the loop of the groove 9 a rectangle with at least one additional transverse grooves 18 and more perpendicular grooves 19 thereto, all junctions and angles of the straight groove sections 9, 11, 18 and 19 being made with pointed arched sections 12, which are in the same shape and for the same purpose as in the first embodiment.

Ta izvedba nudi v primerjavi s prvo izvedbo več različic grela po toplotni moči in temperaturni razporeditvi po plošči in s tem v pečici.This version offers several versions of the heater in terms of heat output and temperature distribution across the plate and thus in the oven compared to the first version.

ZaFor

1. Gorenje Gospodinjski aparati, d.o.o.,1. Gorenje Home Appliances, Ltd.,

2. T.T.E., Tovarna tehničnih elementov, d.o.o.:2. T.T.E., Technical Element Factory, Ltd.

Claims

Patent claims

An electric heater, preferably for stove ovens, which is essentially derived from the plate (1), the pearl coil (2) and the connection element (3), characterized in that the plate (1) is bombed and made in the middle of one sides with an open short extension (4), in cross section, in the form of lower and wide letters U with a shorter section (5) of the transverse leg at the free end, with a connecting element (3) located in the section (5) of the free end of the extension (4) ) by extending the lateral edges (6) of the recess (5) in its longitudinal grooves (7), and the edges (6) are eventually bent over the element (3) and guided from the connecting element (3) by the groove extension (4) ) both ends of the coil (2) so as to form a loop (8) lying in the outer groove (9) and with it a series-bound inner loop (10) in the inner groove (11).

Electric heater according to claim 1, characterized in that the groove (9) extends along the edge of the plate (1), in one section, preferably in the middle of the peripheral side opposite the extension (4), towards the center of the inner loop plate (10) running in a groove (11) having the outline of an equal-trapezoid with two shorter parallel bases (11 ') ·

Electric heater according to claims 1 and 2, characterized in that all the angles and junctions of the straight sections of the two grooves (9 and 11) are markedly rounded, the arc sections (12) being sickle shaped and wider than the diameter of the helix (2). ).

Electric heater according to claims 1 to 3, characterized in that the grooves (9 and 11) are provided with tongues (14) for fixing the pearl coil (2), with the tongues (14) spaced apart at regular intervals. and each tab (14) is wider than 1.4 the width of the visible portion of the individual bead (15).

Electric heater according to claims 1 to 4, characterized in that it forms the upper surface (17) of the plate (1) with a tangent tangent (T) to the adjacent groove (9) as a = 30 to 60 °.

24024-l / D14-XI-94.

Electric heater according to claims 1, 3, 4 and 5, characterized in that the groove (9) is extruded along the edge of the plate (1), while the second groove (11) originates from one straight from the intersection of the groove (9) forms a rectangle inside the loop of the groove (9) with at least one additional transverse groove (18) and several grooves (19) perpendicular to it.