DK164612B

DK164612B - THERMOSTAT

Info

Publication number: DK164612B
Application number: DK011285A
Authority: DK
Inventors: Dieter Kahle
Original assignee: Grohe Armaturen Friedrich
Priority date: 1984-01-11
Filing date: 1985-01-10
Publication date: 1992-07-20
Also published as: FI80530B; ATE35056T1; FI80530C; EP0153555A1; EP0153555B1; DE3400699A1; DK11285D0; DE3563269D1; DK11285A; FI844974A0; DK164612C; FI844974L

Abstract

1. Thermostat for use in sanitary mixing valves for cold and hot water having an expansible material arranged in a substantially rigid housing (1), which acts on a press pin (4) mounted in a shaft-like guide member in such a manner that it is longitudinally idsplaceable heat-conducting elements (7, 8) being inserted in the housing (1) and projecting into the expansible material characterized in that one or more heat-conducting element (7, 8) folded into a star shape are inserted into the housing (1) in such a manner that the folds (9) of the heat-conducting elements (7, 8) that project approximately radially inwards extend at a distance apart, approximately parallel to the axis of the press pin (4).

Description

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iin

Opfindelsen angår en termostat som angivet i krav l's indledning. Ved de kendte termostater af denne art (jfr. DE-brugsmønster 19 13 112) er det udvidelige materiale indesluttet i en stiv, bægerformet kapsel. Det expansi-3 ve materiale formes herved tilnærmelsesvis til en mas siv cylinder, hvis overflade er forholdsvis lille i forhold til voluminet. De sædvanlige expansive materialer til dette formål har desuden en forholdsvis ringe varmel edningsevne, der sammen med ovennævnte forhold 10 mellem materialets overfladeareal og volumen indebærer, at de kendte termostater arbejder med forholdsvis stor forsinkelse eller med andre ord har en lav reaktionshastighed, hvilket er en ulempe, når en termostat skal anvendes i blandingsventiler til blanding af koldt og 13 varmt brugsvand.The invention relates to a thermostat as set forth in the preamble of claim 1. In the known thermostats of this kind (cf. DE usage pattern 19 13 112) the expandable material is enclosed in a rigid, cup-shaped capsule. The expansive material is thereby formed approximately into a solid cylinder, the surface of which is relatively small relative to the volume. In addition, the usual expansive materials for this purpose have a relatively poor thermal conductivity which, together with the above-mentioned ratio 10 between the surface area and volume of the material, means that the known thermostats operate with relatively high delay or in other words have a low reaction rate, which is a disadvantage. , when a thermostat is to be used in mixing valves for mixing cold and 13 hot tap water.

Til afhjælpning af denne mangel har man allerede foreslået (jfr. DE-brugsmønster nr. 19 13 112) at forbedre varmeledningen ved, at der i beholderen for det expansive materiale under beholderens fyldning med dette an-20 bringes hullede skiver, der orienteres på tværs af tryk- stiftens akse. Disse skiver skal have en ombertlet rand, der tjener som afstandsorgan til fastlæggelse af afstanden mellem de enkelte skiver, og som skal sikre varme-overførselen til beholdervæggens indre vægflade.In order to remedy this deficiency, it has already been proposed (cf. DE usage pattern no. 19 13 112) to improve the heat conduction by placing in the container for the expansive material during filling of the container with holes which are oriented transversely. of the pressure pin axis. These discs must have a fluted edge which serves as a spacer for determining the distance between the individual discs and which ensures the heat transfer to the inner wall surface of the container wall.

25 På grund af de på tværs af trykstiftens akse orientere de skiver i beholderen ifyldes det som oftest voksagti-ge expansive materiale i tabletform, hvorved imidlertid termostatens sammenbygning kompliceres. Desuden kan det ikke udelukkes, at skiverne på grund af det voksag-30 tige expansive materiales volumenændring under termosta tens drift forskydes i huset eller endog deformeres, hvorved en direkte varmeledning til husvæggen kan blive afbrudt.Due to the orientation of the slices in the container across the axis of the pressure pin, waxy expansive material is usually filled in tablet form, however, which complicates the thermostat's construction. In addition, due to the volume change of the waxy expansive material during operation of the thermostat, the disks cannot be ruled out in the housing or even deformed, thereby interrupting a direct heat conduction to the housing wall.

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Endelig yder de på tværs af udvidelsesretningen anbragte skiver friktionsmodstand mod en volumenændring af det voksagtige expansive materiale, så at skiverne udgør en hindring for sådanne volumenændringer.Finally, the discs disposed across the direction of expansion provide frictional resistance to a volume change of the waxy expansive material so that the discs are an obstacle to such volume changes.

5 Opfindelsen har til formål at tilvejebringe en termo stat af den i krav l's indledning angivne art, der i forholdsvis lang tid har en konstant stor reaktionshastighed, og som kan fremstilles med relativt enkle midler og billigt. Ovennævnte formål opnås ved det i krav 10 l's kendetegnende del angivne. Underkravene 2-8 kende tegner yderligere ejendommeligheder ved termostaten.The invention has for its object to provide a thermostat of the kind specified in the preamble of claim 1, which has a relatively high reaction rate for a relatively long time and which can be produced by relatively simple means and inexpensively. The above object is achieved by the characterizing part of claim 10 l. The subclaims 2-8 of the drawings further characterize the thermostat.

Termostaten ifølge opfindelsen er især fordelagtig derved, at der på grund af det let foldelige, stjerneformede varmeledningselement opnås en meget god og uhin-15 dret varmetransport mellem det udvidelige materiale og husvæggen. Varmeledningselementets virksomme flader er orienteret i aksial retning, så at friktionen mellem det expansive materiale og elementet reduceres til et minimum, og at det udvidelige materiale friktionsfrit 20 kan indføres i huset.The thermostat according to the invention is particularly advantageous in that, due to the easily foldable, star-shaped heat conduit element, a very good and unobstructed heat transfer between the expandable material and the housing wall is achieved. The active surfaces of the heat conduit element are oriented in the axial direction so that the friction between the expansive material and the element is reduced to a minimum and that the expandable material can be frictionally introduced into the housing.

Det foldede varmeledningselement har en fjedervirkning i radial retning, så at der dels uden videre kan kompenseres for beholdertolerancer og dels varmelednings-elementet på grund af sin forspænding presses radialt 25 udad mod husets væg, så at der fås en sikker varmeled- ningskontakt.The folded heat conduit element has a spring effect in the radial direction, so that container tolerances can be compensated partly and partly because of its bias, radially 25 is pressed outwardly against the wall of the housing, so that a safe heat conduction contact is obtained.

Endelig kan der ved simpel fastlodning af det f.eks. af kobber fremstillede varmeledningselements mod huset anliggende flader til husvæggens inderside tilvejebrin-30 ges en optimal varmestrømning mellem det expansible materiale og husets væg.Finally, by simply soldering it, e.g. Copper-made heat conduit elements abutting the surfaces of the housing to the inside of the housing wall provide an optimum heat flow between the expandable material and the housing wall.

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3 I det følgende forklares opfindelsen nærmere ued hjælp af tegningen, hvor fig. 1 i forstørret målestok er et længdesnit i en udførelsesform for termostaten ifølge opfindelsen, 5 fig. 2 er et snit efter linien 11 — 11 i fig. 1 og viser et i termostaten anbragt varmeledningselement, og fig. 3 er et til fig. 2 svarende snit og viser varmeled-ningselementet i en anden udførel sesform.3 In the following, the invention is explained in more detail with the aid of the drawing, in which fig. Fig. 1 is an enlarged view of a longitudinal section of an embodiment of the thermostat according to the invention; 2 is a sectional view taken along line 11 - 11 of FIG. 1, showing a thermocouple element arranged in the thermostat; and FIG. 3 is a view of FIG. 2 is a sectional view showing the heat conduit element in another embodiment.

I alle tegningens figurer er analoge dele betegnet med sammen henvisningsbetegnelser. Den i fig. 1 og 2 viste 10 termostat har et hus 1 bestående af en bægerformet ned re del 2 og en øvre del 3, der tjener som koncentrisk styr og holder for en trykstift 4, en skive 5 og en membran 6. I husets cylindriske nedre del 2 er anbragt et varmeledningselement 7 til acceleration af en varme-15 flux mellem den nedre husdel 2's væg og et i huset 1 fyldt udvideligt materiale 10.In all of the drawings, analogous parts are denoted by reference numerals together. The FIG. 1 and 2 the thermostat has a housing 1 consisting of a cup-shaped lower part 2 and an upper part 3 serving as concentric guide and holder for a push pin 4, a disc 5 and a membrane 6. In the cylindrical lower part 2 is arranged a heat conduit element 7 for accelerating a heat flux between the wall of the lower housing part 2 and an expandable material 10 filled in the housing 1.

Varmeledningselementet består som vist i fig. 2 af et tyndvægget kobberrør med et korsformet tværsnit tilvejebragt ved hjælp af fire folder 9. Varmeledningselemen-20 tet har en sådan form, at det forholdsvis jævnt dækker alle områder i det af det expansible materiale fyldte rum i huset. Det i tværsnit korsformede varmeelement 7's korsspidser 71 er fastsvejset til husvæggens inderside, medens dets ene endeflade er fastsvejset til den 25 nedre husdel 2's bund 21. Efter ifyldningen af det udvi delige materiale i husets nedre del 2 og ilæggelse af membranen 6 i husets øvre del 3 samles husets to dele 2 og 3, hvorefter de sammenføjes og sammenbert1 es tæt ved hjælp af en ombertlingsansats 11 på husets nedre 30 del 2.The heat conduit element consists as shown in FIG. 2 of a thin-walled copper tube of a cruciform cross-section provided by four folds 9. The heat conduit element 20 is of such a shape that it covers evenly all areas of the expansible material filled space in the housing. The cross-tips 71 of the cross-sectional heating element 7 are welded to the inside of the housing wall, while its one end surface is welded to the bottom 21 of the lower housing part 2. After loading the removable material into the lower part 2 of the housing and inserting the membrane 6 into the upper part of the housing. 3, the two parts 2 and 3 of the housing are assembled, and then they are joined together and fastened together by means of a recirculation bracket 11 on the lower part 2 of the housing.

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Opstår der i termostatens omgiv/else temperaturændringer, forplantes disse ved hjælp af varmeldningselementet 7 accelereret til det expansible materiale 10, hvorved der inden for meget kort tid frembringes en tilsvaren-5 de ændring af materialets volumen, hvorved membranen 6's form ændres tilsvarende og derved trykstiften 4 forskydes.If temperature changes occur in the ambient temperature of the thermostat, these are propagated by means of the heating element 7 accelerated to the expandable material 10, which in a very short time produces a corresponding change in the volume of the material, thereby changing the shape of the membrane 6 and thereby the pressure pin. 4 is displaced.

Membranen 6 består ved den viste udførelses form af gummi eller et lignende materiale, og membranens perifere 10 randområde tjener som tætningsorgan mellem husets to dele 2 og 3 i området ved ombertlingsansatsen 11. I stedet for en gummimembran kan der selvfølgelig også anvendes en metalmembran, og husets øvre del kan være forbundet med husets nedre del ved svejsning.The diaphragm 6 consists, in the embodiment shown, of rubber or a similar material, and the peripheral peripheral region of the diaphragm serves as a sealing member between the two parts 2 and 3 of the housing in the area of the reburner assembly 11. Of course, instead of a rubber diaphragm, a metal diaphragm can also be used, and the upper part of the housing may be connected to the lower part of the housing by welding.

13 Fig. 3 viser en med 8 betegnet anden udførelsesform for varmeledningselementet, der er foldet rosetformet af kobberplade, hvis plademateriale i det ydre område er tilpasset’ huset l's væg og danner en stort antal folder, der fra husets væg strækker sig radialt indad.13 FIG. 3 shows a second embodiment of the heat conduit element, indicated by 8, which is folded rosette-shaped by copper plate, whose sheet material in the outer region is adapted to the wall of the housing 1 and forms a large number of folds extending radially inwardly from the housing.

20 løvrigt svarer udførelsesformen ifølge fig. 3 til den i fig. 1 og 2 viste.20, the embodiment of FIG. 3 to that of FIG. 1 and 2.

Claims

1. Thermostat for use in mixing valve in 1 is for mixing cold and hot water with an expandable material (10) arranged in a substantially rigid housing (1) and acting on a pressure pin (4) which is axially slidably mounted in a shaft-shaped guide member, and 5 wherein heat conduit elements (7, 8) surrounded by the expandable material (10) are provided in the housing (1), characterized in that one or more star-shaped folded heat conduit elements (7, 8) are inserted into the housing (1) in such a way that the folds (9) formed at the fold 10 extend approximately radially inwardly at approximately equal spacing and extend approximately parallel to the axis of the push pin (4).

Thermostat according to claim 1, with an approximately cylindrical housing for receiving the expandable material, characterized in that the folded heat conducting elements (7, 8) are pressed into the housing (1) with bias.

Thermostat according to claim 1 or 2, characterized in that the folded heat conduit elements (7, 20 8) are formed of metal plate, in particular copper plate.

Thermostat according to claim 1 or 2, characterized in that the folded heat conduit elements (7, 8) are formed of metal pipes, especially copper pipes.

Thermostat according to claim 1, characterized in that the surface portions of the heat conduit elements (7, 8) abutting the housing portions are soldered to the housing.

6. A thermostat according to claim 1, characterized in that the heating elements (7, 8) are soldered to the bottom (21) of the housing (1).

Thermostat according to claims 1-6, characterized by a heat conduit element (7) folded cross-shaped and the tips of the cross (71) being shaped corresponding to the wall of the housing (1).

Thermostat according to claims 1-6, characterized by a rosette-shaped heat conduit element (8), the plate material of which is adapted to the wall of the housing (1) and forms a large number of folds (9) extending radially inwards from the wall of the housing.