SI9500239A

SI9500239A - Bimetallic thermostat, new construction

Info

Publication number: SI9500239A
Application number: SI9500239A
Authority: SI
Inventors: Bine Meglic
Original assignee: Bine Meglic
Priority date: 1995-07-28
Filing date: 1995-07-28
Publication date: 1997-04-30

Abstract

Bimetalni termostat nove konstrukcije ima lastnosti tokovno pretočnega bimetalnega termostata, čeprav čez bimetalni trak (13) ne teče električni tok. To pa zato, ker je bimetalni trak (13) v dobrem toplotnem stiku z elementi termostata, ki prevajajo električni tok. To so: dovodni električni priključek (7), stikalni mehanizem (5), gibljivi kontakt (6), fiksni kontakt (11) ter odvodni električni priključek (12). Na teh elementih in njihovih spojih se zaradi notranje upornosti pri prehodu električnega toka ustvarja Joulska toplota. Ta pa se prenese tudi na bimetalni trak (13) zaradi dobrega toplotnega stika med njim in odvodnim električnim priključkom (12). Posledica tega je segrevanje bimetalnega traku in s tem znižanje temperaturnih stikalnih diferenc termostata. Za izdelavo tega novega bimetalnega termostata je pomembno, da so sestavni deli podobni delom obstoječih termostatov.The bimetallic thermostat of the new construction has bimetallic thermostat flow characteristics, although no electric current flows through the bimetallic strip (13). This is because the bimetallic strip (13) is good thermal contact with thermostat elements that translate electric current. These are: supply electrical connection (7), switch mechanism (5), flexible contact (6), fixed contact (11) and outlet electrical connection (12). On these elements and their joints are due internally it generates resistances in the passage of electricity Joule heat. This is also transferred to the bimetallic tape (13) due to good thermal contact between it and with an electrical outlet (12). The consequence of this is the heating of the bimetallic strip and thus the lowering thermostat temperature switch differentials. For production this new bimetallic thermostat is important that the components are similar to those of the existing ones thermostats.

Description

BIMETALNI TERMOSTAT - NOVA KONSTRUKCIJABIMETAL THERMOSTAT - A NEW CONSTRUCTION

Predmet izuma je nova konstrukcija bimetalnega termostata za regulacijo temperature zlasti v gospodinjskih aparatih.The subject of the invention is a new construction of a bimetallic thermostat for temperature control, especially in household appliances.

Tehnični problem, ki ga rešuje izum, je konstrukcija bimetalnega termostata, ki dosega sorazmerno male temperaturne stikalne diference.A technical problem solved by the invention is the construction of a bimetallic thermostat that achieves relatively low temperature switching differentials.

Male temperaturne stikalne diference se danes dosegajo s tokovno pretočnimi bimetalnimi termostati v dveh karakterističnih izvedbah.Low temperature switching differentials are now achieved with bimetallic flow thermostats in two characteristic designs.

Pri prvi izvedbi je bimetalni trak, čez katerega teče električni tok, obenem del stikalnega mehanizma. Pomanjkljivost te izvedbe je sorazmerno nizka zgornja temperaturna mejaIn the first embodiment, the bimetallic strip over which the electrical current flows is also part of the switch mechanism. The disadvantage of this embodiment is the relatively low upper temperature limit

O regulacije, ki znaša okrog 100 C. Druga najnovejša verzija tokovno pretočnega bimetalnega termostata nima te temperaturne omejitve, je pa tehnološko zahtevnejša ter ima namesto treh tukaj štiri izolime prstane ter vzdolžno razcepljen bimetalni trak, čez katerega teče električni tok.About the regulation, which is about 100 C. The second latest version of the current-flow bimetallic thermostat does not have this temperature limit, but is technologically more demanding, instead of three here it has four insulating rings and a longitudinally split bimetallic strip through which electrical current flows.

Termostate te izvedbe proizvaja italjanska firma CAMPINI pod oznako Ty 23 - S in nemška firma STB pod oznako M - 141 141.048 in M - 141 141.608.The thermostats of this design are manufactured by the Italian company CAMPINI under the designation Ty 23 - S and the German firm STB under the designation M - 141 141.048 and M - 141 141.608.

Tokovno nepretočni bimetalni termostati so tehnološko in konstrukcijsko dodelani že dalj časa. Njihova pomanjkljivost pa je sorazmerno velika temperaturna stikalna diferenca.Current-proof bimetallic thermostats have been technologically and constructionally refined for a long time. Their disadvantage, however, is the relatively large temperature switch differential.

S spremenjeno zasnovo tokovno nepretočnega bimetalnega termostata naredimo novo konstrukcijo termostata z lastnostmi tokovno pretočnih bimetalnih termostatov, kije predmet izuma in je opisan posl. 1.With the modified design of a flow-proof bimetallic thermostat, a new design of a thermostat is made with the properties of flow-flow bimetallic thermostats, which is the subject of the invention and described in the present description. 1.

Bimetalni termostat po izumu je sestavljen iz nosilne konzole 1 z vdelano vijačnico, v kateri se z vrtenjem vzdolžno premika os za nastavitev temperature 2 z omejilnikom zasuka 3 . Os ima na koncu vstavljen izolimi čep osi 4, ki pritiska na preklopni del stikalnega mehanizma 5, kije skupaj z dovodnim električnim priključkom 7 nameščen med izolima prstana 8 in 9. Na preklopnem delu stikalnega mehanizma je gibljivi kontakt 6.The bimetallic thermostat according to the invention consists of a support bracket 1 with an integrated helix in which the axis for adjusting temperature 2 is rotated longitudinally by a rotary limiter 3. The axle finally has an insulated pin of the axis 4, which presses on the switching part of the switch mechanism 5, which, together with the supply electrical connection 7, is placed between the ring insulators 8 and 9. There is a moving contact 6 on the switching part of the switch mechanism.

Med izolima prstana 9 in 10 pa je nameščen fiksni kontakt 11 skupaj z odvodnim električnim priključkom 12 in bimetalnim trakom 13. Na koncu bimetalnega traku je vstavljen izolimi čep bimetala 17 za prenos mehanskega pritiska z bimetalnega traku na stikalni mehanizem 5.Between the insulators of rings 9 and 10, there is a fixed contact 11 together with an outlet electrical connector 12 and a bimetallic strip 13. An insulated bimetal plug 17 is inserted at the end of the bimetallic strip to transfer mechanical pressure from the bimetallic strip to the switch mechanism 5.

Na drugi strani izolimega prstana 10 je podložka 14. Deli 1, 5, 7, 8, 9, 10, 11, 12, 13 in 14 so med seboj spojeni z votlo zakovico 15, ki jo od tokovodnih delov termostata loči cilindrična izolima cevka 16.On the other side of the insulating ring 10 is a washer 14. Parts 1, 5, 7, 8, 9, 10, 11, 12, 13 and 14 are connected to each other by a hollow rivet 15, which is separated from the flowing parts of the thermostat by a cylindrical insulator tube 16. .

Delovanje bimetalnega termostata po izumu razložimo s pomočjo sl.l.The operation of the bimetallic thermostat according to the invention is explained by means of FIG.

Pri vključenem bimetalnem termostatu v sistem regulacije teče električni tok skozi termostat čez dovodni priključek 7 ter dalje preko stikalnega mehanizma 5, zaprtih kontaktov 6 in 11 ter čez odvodni električni priključek 12. Vsa ta tokovodna pot skozi termostat pa ima svojo ohmsko upornost in se zato pri prehodu električnega toka na vseh teh elementih ustvarja Joulska toplota.When the bimetallic thermostat is connected to the control system, electrical current flows through the thermostat through the inlet terminal 7 and further through switch mechanism 5, closed contacts 6 and 11 and through the outlet electrical connection 12. All this flow path through the thermostat, however, has its ohmic resistance and therefore The passage of electric current on all these elements is generated by Joule heat.

Pri tej zasnovi termostata pa izkoristimo ravno to sproščeno toploto. Toplota, ki se pojavi na odvodnem električnem priključku 12 se namreč z njega prenese na bimetalni trak 13 zaradi dobrega toplotnega stika med njima, ki ga nudi ta konstrukcija. Bimetalni trak se zaradi tega segreva, četudi čez njega ne teče električni tok. Termostat je s tem dobil lastnosti tokovno pretočnega termostata.In this design of the thermostat, however, we utilize precisely this released heat. The heat generated on the discharge electrical connection 12 is transferred from it to the bimetallic strip 13 due to the good thermal contact between them provided by this structure. As a result, the bimetallic strip is heated even though no electrical current is flowing through it. The thermostat thus obtained the characteristics of a flow-through thermostat.

Bimetalni trak se torej segreva deloma od medija, ki mu želimo regulirati remperaturo, deloma od toka skozi termostat. Zaradi tega se bimetalni trak ukrivi in pri zadostni ukrivljenosti - odvisno od predhodne nastavitve osi 2 - preko izolimega čepa bimetala povzroči s preklopom stikalnega mehanizma 5 odmik gibljivega kontakta 6 in s tem prekinitev električnega toka. Po zadostni ohladitvi bimetalnega traku se proces ponovi. Seveda morajo biti vsi materiali, zlasti izolimi prstani, cilindrična izolima cevka in oba izolima Čepa - odvisno od posamezne zahteve - iz termično zadosti odpornega materiala.The bimetallic strip is therefore heated partly from the medium to which the repertoire is to be regulated, partly from the flow through the thermostat. As a result, the bimetallic strip is bent and, with sufficient curvature - depending on the pre-setting of the axis 2 - through the isolating pin of the bimetal, the switching of the switch mechanism 5 causes the displacement of the moving contact 6, thereby interrupting the electrical current. After sufficient cooling of the bimetallic strip, the process is repeated. Of course, all materials, in particular insulating rings, cylindrical tube insulators and both plug insulations - depending on individual requirement - must be of thermally sufficient material.

Bine MEGLIČBine MEGLIČ

Claims

PATENT APPLICATION

A bimetallic thermostat of a new construction with the characteristics of a flow-through thermostat, characterized in that a fixed contact (11), an outlet electrical connection (12) and a bimetallic strip (13) are mounted between the ring insulators (9) and (10) of thermally stable insulating material. ) and are in good thermal contact with each other, which causes the Joule losses on the flow parts of the thermostat to be transferred to the bimetallic strip, which is therefore heated even though no electrical current is flowing through it.

Bine MEGLIČ