DK172443B1

DK172443B1 - Control unit for temperature of water from a water conduit

Info

Publication number: DK172443B1
Application number: DK199700126A
Authority: DK
Inventors: Erik Eriksen Andresen
Original assignee: Danfoss As
Priority date: 1994-08-05
Filing date: 1997-02-04
Publication date: 1998-07-27
Also published as: DK12697A

Description

DK PR 172443 B1DK PR 172443 B1

Opfindelsen omhandler en reguleringsenhed til temperaturen på vand fra en vandledning, med en varmeveksler, hvis primærside ligger i serie med en flowjusteringsventil i et varmtvandskredsløb, og gennem hvis sekundærside vandlednin-5 gen passerer, med en temperaturføler, der måler vandtemperaturen i vandledningen nedstrøms af varmeveksleren, og omformer den til et tryk, der påvirker lukkeanordningen i flowju-steringsventilen imod kraften fra en fjeder, der ligger an mod flowjusteringsventilens hus, og har en måledyse anbragt 10 i vandledningen, hvorved flowjusteringsventilen omfatter en membran mellem to kamre, af hvilke et er tilsluttet højtrykssiden af måledysen og det andet er tilsluttet lavtrykssiden af måledysen, og membranens udbøjning forårsaget af differenstrykket på måledysen virker imod temperaturfølerens 15 tryk på flowjusteringsventilens lukkeanordning.The invention relates to a control unit for the temperature of water from a water pipe, with a heat exchanger whose primary side is in series with a flow adjustment valve in a hot water circuit, and through whose secondary side the water pipe passes, with a temperature sensor which measures the water temperature in the water pipe downstream of the heat exchanger. and converts it to a pressure acting on the closure device of the flow adjusting valve against the force of a spring abutting the flow adjusting valve housing, and having a measuring nozzle disposed 10 in the water line, the flow adjusting valve comprising a diaphragm between two chambers, one of which is connected to the high pressure side of the measuring nozzle and the other connected to the low pressure side of the measuring nozzle, and the deflection of the membrane caused by the differential pressure on the measuring nozzle acts against the pressure of the temperature sensor 15 on the flow adjustment valve closing device.

I en kendt, i handelen værende reguleringsenhed af denne art, overføres membranens udbøjning forårsaget af differenstrykket på måledysen ved hjælp af en anden fjeder til 20 flowjusteringsventilens lukkeanordning i dennes lukkeretning. Membranens udbøjning i åbneretningen er begrænset så snævert af en stoppeanordning, at selv en ganske lille åbning af en varmtvandsaftapningsventil i vandledningen i varmevekslerens medstrømsretning fører til en trykdifference på 25 måledysen, der er tilstrækkelig til at udbøje membranen så langt som til stoppeanordningen, uden at flowjusteringsventilen åbner helt. Flowjusteringsventilen fortsætter først med at åbne, når gennemstrømningen eller aftapningen af vand gennem varmtvandsaftapningsventilen er steget tilstrækkeligt 30 til, at temperaturen på det vand, der aftappes til brug, er faldet yderligere og teroperaturændringen er blevet registreret af temperaturføleren. Dette kan føre til, at det aftappede vand afkøles for meget, når den aftappede mængde er forholdsvis stor, før temperaturen stiger igen ved en til-35 svarende yderligere åbning af flowjusteringsventilen ved hjælp af temperaturføleren; temperaturen kan stige til over den ønskede værdi, før den voldsomme stigning i temperaturen registreres af temperaturføleren. Temperaturføleren drosler 2 DK PR 172443 B1 så igen gennemstrømningen gennem flowjusteringsventilen, i hvilken differenstrykket ved måledysen, der registrerer gennemstrømningen, falder så langt, når en minimumsgrænseværdi er nået, at flowjusteringsventilen igen bliver helt lukket 5 af membranens modsatte udbøjning, med det resultat, at hvis aftapningen af vand fortsættes, vil temperaturen på det aftappede brugsvand igen være væsentlig under den ønskede værdi, indtil flowjusteringsventilen igen åbnes af den diffe-renstryksafhængige udbøjning på membranen og teroperaturføle-10 rens påvirkning af lukkeanordningen på flowjusteringsventilen i fællesskab. Specielt kræver en overskridelse af den ønskede temperaturværdi usædvanlig meget varmeenergi på varmevekslerens primærside.In a known, commercially available control unit of this kind, the deflection of the diaphragm caused by the differential pressure on the measuring nozzle is transmitted by means of a second spring to the closing device of the flow adjustment valve in its closing direction. The deflection of the diaphragm in the opening direction is limited so narrowly by a stop device that even a very small opening of a hot water drain valve in the water conduit in the co-current direction of the heat exchanger leads to a pressure difference of the measuring nozzle sufficient to extend the diaphragm as far as the stop device. opens completely. The flow adjustment valve only continues to open when the flow or drain of water through the hot water drain valve has increased sufficiently 30 that the temperature of the water drained for use has further decreased and the change in temperature has been detected by the temperature sensor. This can cause the bottled water to cool too much when the bottled amount is relatively large before the temperature rises again by a corresponding further opening of the flow adjustment valve by the temperature sensor; the temperature can rise above the desired value before the violent rise in temperature is detected by the temperature sensor. The temperature sensor drops 2 DK PR 172443 B1 then again flows through the flow adjusting valve, in which the differential pressure at the measuring nozzle which registers the flow decreases so far when a minimum limit value is reached that the flow adjustment valve is again fully closed 5 of the opposite deflection of the membrane, with the result that if water bottling is continued, the temperature of the bottled tap water will again be substantially below the desired value until the flow adjustment valve is again opened by the differential pressure-dependent deflection of the diaphragm and the operation of the thermostat sensor on the closing device of the flow adjusting valve jointly. In particular, exceeding the desired temperature value requires unusually high heat energy on the primary side of the heat exchanger.

15 Opfindelsen er baseret på problemet med fremstilling af en reguleringsenhed af den i indledningen nævnte art, der muliggør opretholdelse af temperaturen på det aftappede vand under anvendelse af forholdsvis ringe varmeenergi, uanset mængden af aftappet vand pr. tidsenhed.The invention is based on the problem of producing a regulator of the kind mentioned in the preamble which enables the temperature of the bottled water to be maintained using relatively little heat energy, regardless of the amount of bottled water per unit of time. unit of time.

2020

Ifølge opfindelsen løses dette problem ved, at membranen er fast forbundet med lukkeanordningen i flowjusteringsventilen i dennes lukkeretning, og at dens udbøjning i flowjusteringsventilens åbneretning til stadighed koordineres med 25 trykforskellen ved måledysen og forskellen mellem fjederkraften og trykkraften i temperaturføleren.According to the invention, this problem is solved by the diaphragm being firmly connected to the closing device of the flow adjustment valve in its closing direction and its deflection in the opening direction of the flow adjustment valve being continuously coordinated with the pressure difference at the measuring nozzle and the difference between the spring force and the pressure force in the temperature sensor.

I denne løsning forårsager en ændring i trykforskellen registreret af måledysen, der svarer til den strøm af vand, der 30 aftappes til brug, straks en tilnærmet proportional ændring i membranudbøjningen, svarende til denne strøm, i flowjusteringsventilens åbneretning, der er bestemmende for strømmen af varmt vand, endnu før temperaturføleren har konstateret en temperaturændring. På denne måde undgås for store udsving 35 i brugsvandstemperaturen over den ønskede værdi, og dermed et overforbrug af energi.In this solution, a change in the pressure difference recorded by the measuring nozzle corresponding to the flow of water being drained for use immediately causes an approximately proportional change in the membrane deflection corresponding to this flow in the flow direction valve opening direction, which determines the flow of hot water. water, even before the temperature sensor has detected a temperature change. In this way, excessive fluctuations 35 in the DHW temperature above the desired value are avoided, and thus an over-consumption of energy.

3 DK PR 172443 B1 Måledysen er fordelagtigt anbragt opstrøms i vandledningen i forhold til temperaturføleren. Derfor registrerer den en ændring i strømmen af varmt brugsvand særlig hurtigt, endog før der sker en markant ændring i vandtemperaturen.3 DK PR 172443 B1 The measuring nozzle is advantageously located upstream of the water line relative to the temperature sensor. Therefore, it detects a change in the flow of hot tap water very quickly, even before a significant change in water temperature occurs.

5 Åbningen af måledysen kan begrænses af et ventilsæde, der samarbejder med en lukkeanordning, der er forspændt i lukkeretning af en fjeder med en justerbar fjederkraft imod vandets gennemstrømningsretning gennem måledysen. På denne måde 10 kan den ønskede værdi af brugsvandstemperaturen justeres på en særlig enkel måde, fof eksempel, jo højere værdien skal være, jo højere skal fjederkraften være, og omvendt.The opening of the measuring nozzle can be limited by a valve seat cooperating with a closing device which is biased in the closing direction by a spring with an adjustable spring force against the flow of water through the measuring nozzle. In this way, the desired value of the DHW temperature can be adjusted in a particularly simple manner, for example, the higher the value must be, the higher the spring force must be, and vice versa.

Måledysen kan have en by-pass kanal, hvis åbningsbredde er 15 dimensioneret sådan, at hvis aftapningen af varmt vand afbrydes, opretholdes en minimumsåbning på flowjusteringsven-tilen. Dette sikrer, at måledysen ikke udøver et differenstryk på membranen, og denne forbliver i ligevægt for at holde flowjusteringsventilen overvejende lukket, når der ik-20 ke aftappes varmt brugsvand, men brugsvandet har stadig en lavere grænsetemperatur før aftapning.The measuring nozzle may have a by-pass duct whose aperture width is dimensioned such that if hot water is interrupted, a minimum opening of the flow adjustment valve is maintained. This ensures that the metering nozzle does not exert a differential pressure on the diaphragm and it remains in equilibrium to keep the flow adjustment valve predominantly closed when hot tap water is not drained, but the tap water still has a lower limit temperature before draining.

Det kan således sikres, at lukkeanordningen i flowjusteringsventilen, lige før den når sin lukkestilling, forspæn-25 des i åbneretningen med en forøget fjederkraft. Selv i ekstreme belastningstilfælde, såsom en høj varmtvandstemperatur og højt differenstryk ved måledysen og små mængder af aftappet varmt vand pr. tidsenhed, kan der derfor opnås en stabil styring, da flowjusteringsventilens åbnekarakteristik i det-30 te tilfælde skulle være eksponentiel. Den forøgede fjederkraft giver en væsentlig forøgelse af den kraft, der er nødvendig for at lukke flowjusteringsventilen lige før den lukker, så selv små mængder af aftappet varmt vand ved høje varmtvandstemperaturer resulterer i en stabil styring.Thus, it can be ensured that the closing device in the flow adjustment valve, just before it reaches its closing position, is biased in the opening direction with an increased spring force. Even in extreme load situations, such as high hot water temperature and high differential pressure at the measuring nozzle and small amounts of bottled hot water per day. Therefore, a stable control can be obtained, since in this case the opening characteristic of the flow adjustment valve should be exponential. The increased spring force provides a significant increase in the force needed to close the flow adjustment valve just before it closes, so even small amounts of bottled hot water at high hot water temperatures result in stable control.

35 I det følgende beskrives opfindelsen mere detaljeret på basis af tegninger af en foretrukket udførelse, som viser: 4 DK PR 172443 B1In the following, the invention is described in more detail on the basis of drawings of a preferred embodiment which show: 4 DK PR 172443 B1

Fig. 1 et blokdiagram over kredsløbet i en reguleringsenhed ifølge opfindelsenFIG. 1 is a block diagram of the circuit of a control unit according to the invention

Fig. 2 hovedkomponenterne i reguleringsenheden, delvis i 5 snitFIG. 2 main components of the control unit, partly in 5 sections

Fig. 3. et delbillede af fig. 2, der viser en ændret komponent.FIG. 3. a partial view of FIG. 2, showing a modified component.

10 Som vist i fig. l, føder et varmesystem 1 et varmtvands-kredsløb 2, i hvilket primærsiden af en varmeveksler 3 er anbragt i serie med en flowjusteringsventil 4. Gennem varmevekslerens 3 sekundærside passerer en vandledning 5, der er forbundet med en koldtvandsforsyning. I vandledningen 5 er 15 en temperaturføler 6 anbragt nedstrøms i forhold til varmeveksleren 3, hvilken føler måler temperaturen på vandet i vandledningen 5. Temperaturføleren 6 er et såkaldt "damptrykstermometer", der omformer den målte temperatur til et tilsvarende damptryk. Opstrøms i forhold til varmeveksle-20 rens 3 sekundærside indeholder vandledningen 5 også en måledyse 7, og nedstrøms i forhold til varmeveksleren 3 en varmtvandsaftapningsventil 8.10 As shown in FIG. 1, a heating system 1 feeds a hot water circuit 2 in which the primary side of a heat exchanger 3 is arranged in series with a flow adjustment valve 4. Passing through the secondary side of the heat exchanger 3 is a water line 5 connected to a cold water supply. In the water conduit 5, a temperature sensor 6 is arranged downstream of the heat exchanger 3, which measures the temperature of the water in the water conduit 5. The temperature sensor 6 is a so-called "vapor pressure thermometer" which converts the measured temperature to a corresponding vapor pressure. Upstream of the secondary side of the heat exchanger 3, the water conduit 5 also contains a measuring nozzle 7, and downstream of the heat exchanger 3 a hot water drain valve 8.

Som vist i fig. 2, har flowjusteringsventilen 4, der bestem-25 mer strømmen af varmt vand gennem varmevekslerens 3 primærside, en membran 9, hvis kant er hermetisk fastklemt mellem kanterne af to forbundne kamre 10 og 11. Membranen 9 er også fastklemt mellem to membranplader 12 og 13, der, ligesom membranen 9, har et hul i midten, i hvis kant membran-30 pladerne 12, 13 og membranen 9 holdes hermetisk sammen af flangen på en del 14a af et flerdelt ventilstempel. Hermetisk fastgjort i en åbning i væggen på kammer 10 er et flerdelt hus 15, hvis endedel 16 danner et ventilhus, i hvilket er konstrueret et ventilsæde 17, på hvilket en ventillukke-35 anordning 18 sidder i flowjusteringsventilens 4 lukketilstand. Lukkeanordningen 18 er fastgjort til enden af endnu en del 14b af ventilstemplet 14. Delen 14b passerer, tætnet, gennem en åbning i et dæksel 19 på ventilhuset 16, hvorved 5 DK PR 172443 B1 dens anden ende er skruet ind i en gevindboring i en møtrik 20. En fjeder 21 ligger an mod møtrikken 20 med den ene ende og indirekte mod dækslet 19. En ring 22 låses så fast på delen 14b af ventilstemplet 14 ved hjælp af mindst en låse-5 skrue 23, der passerer gennem en gevindboring i ringen 22.As shown in FIG. 2, the flow adjustment valve 4, which determines the flow of hot water through the primary side of the heat exchanger 3, has a membrane 9, the edge of which is hermetically clamped between the edges of two connected chambers 10 and 11. The membrane 9 is also clamped between two membrane plates 12 and 13. which, like the diaphragm 9, has a hole in the center, at the edge of which the diaphragm plates 12, 13 and diaphragm 9 are hermetically held together by the flange on a portion 14a of a multi-part valve piston. Hermetically secured in an opening in the wall of chamber 10 is a multi-part housing 15, whose end portion 16 forms a valve housing, in which is constructed a valve seat 17 on which a valve closure device 18 sits in the closing position of the flow adjustment valve 4. The closure device 18 is secured to the end of yet another portion 14b of the valve piston 14. The portion 14b passes, sealed, through an opening in a cover 19 of the valve housing 16, whereby its other end is screwed into a threaded bore in a nut. 20. A spring 21 abuts the nut 20 with one end and indirectly against the cover 19. A ring 22 is then secured to the portion 14b of the valve piston 14 by at least one locking screw 23 passing through a threaded bore in the ring. 22nd

Mellem dækslet 19 og ringen 22 er delen 14b omgivet af yderligere en fjeder 24.Between the cover 19 and the ring 22, the part 14b is surrounded by a further spring 24.

Lukkeanordningen 18 har en central aksial boring, i hvilken 10 den ene ende af delen 14b af ventilstemplet 14 er fastgjort.The closure device 18 has a central axial bore into which one end of the portion 14b of the valve piston 14 is secured.

Delen 14b, der ligger fast an mod oversiden af lukkestykket 18, er yderligere omgivet af et kammer 26, hvis indre er i forbindelse med indgangssiden af ventilhuset 16 via en radial boring 27, en aksial boring 28 i delen 14b, forbundet 15 hermed, og via en boring 25. Den anden ende af delen 14b af ventilstemplet 14 ligger an mod den ene ende af en stift, der udgør yderligere en del 14c af ventilstemplet 14, og hvis anden ende rager ind i en aksial blindboring i den nedre ende af delen 14a af ventilstemplet 14, hvorved stiften 20 er lukket hermetisk mod en endevæg af huset 15.The portion 14b, which abuts the upper side of the closure piece 18, is further surrounded by a chamber 26, the interior of which is connected to the inlet side of the valve housing 16 via a radial bore 27, an axial bore 28 in the portion 14b, connected thereto, and via a bore 25. The other end of the portion 14b of the valve piston 14 abuts one end of a pin constituting a further portion 14c of the valve piston 14, the other end of which projects into an axial blind bore at the lower end of the portion. 14a of the valve piston 14, whereby the pin 20 is hermetically sealed to an end wall of the housing 15.

Et andet hus 29 er hermetisk fastgjort i et hul i væggen på kammeret 11; i huset 29 er der anbragt en bælg 30, hvis overpart 31 ved mellemkomst af en yderligere del 14d er un-25 derstøttet, ved hjælp af en yderligere del 14e, der udgøres af en stift, i en aksial boring i den anden ende af delen 14a, hvorved delen 14e passerer hermetisk lukket gennem en grundplade 32 i huset 29. Den nedre ende af bælgen 30 understøttes af huset 29.Another housing 29 is hermetically secured in a hole in the wall of chamber 11; in the housing 29 is provided a bellows 30, the upper part 31 of which is supported by an additional part 14d supported by an additional part 14e, which is constituted by a pin, in an axial bore at the other end of the part 14a, whereby the portion 14e passes hermetically sealed through a base plate 32 in the housing 29. The lower end of the bellows 30 is supported by the housing 29.

3030

Mellemrummet mellem huset 29 og bælgen 30 er forbundet med temperaturføleren via en rørledning 33.The space between the housing 29 and the bellows 30 is connected to the temperature sensor via a pipeline 33.

Det indvendige af kammeret 10 er forbundet med højtrykssiden 35 af måledysen 7 ved hjælp af en rørledning 34, og det indvendige af kammeret 11 er forbundet med lavtrykssiden af måledysen 7 ved hjælp af en rørledning 35.The interior of the chamber 10 is connected to the high pressure side 35 of the measuring nozzle 7 by means of a pipeline 34, and the interior of the chamber 11 is connected to the low pressure side of the measuring nozzle 7 by means of a pipeline 35.

6 DK PR 172443 B1 Åbningen i måledysen 7 er begrænset af et ventilsæde 36, der samarbejder med en lukkeanordning 38 forspændt i lukkeretningen ved hjælp af en fjeder 37 med justerbar fjederkraft imod vandets gennemløbsretning gennem måledysen. Kraften af 5 fjederen 37 indstilles ved hjælp af en hætte 39, der kan drejes manuelt; hætten har et indvendigt gevind og er skruet på en husanordning 40 på måledysen 7, gennem hvis endeflade en stift 41, fastgjort på indersiden af hætten 39, passerer, hermetisk lukket, og presser mod fjederen 37 ved hjælp af en 10 understøtningsplade 42. Fjederen 37 på sin side overfører trykket til ventillukkeanordningen 38. Den ønskede temperaturværdi på det vand, der strømmer gennem varmeveksleren 3 gennem vandledningen på sekundærsiden, er justerbar ved hjælp af denne hætte 39. Måledysen 7 er yderligere forsynet 15 med en by-pass kanal, ikke vist, hvis åbningsbredde er dimensioneret sådan, at når aftapningen af varmt vand gennem aftapningsventilen 8 afbrydes, dvs. når aftapningsventilen 8 lukker, bibeholdes en minimal åbning af flowjusteringsventi-len 4.6 DK PR 172443 B1 The opening in the measuring nozzle 7 is limited by a valve seat 36 which cooperates with a closing device 38 biased in the closing direction by means of a spring 37 with adjustable spring force against the flow of water through the measuring nozzle. The force of the spring 37 is adjusted by means of a cap 39 which can be turned manually; the cap has an internal thread and is screwed onto a housing device 40 on the measuring nozzle 7, through whose end surface a pin 41, secured to the inside of the cap 39, passes, hermetically sealed, and presses against the spring 37 by means of a support plate 42. The spring 37 in turn transmits the pressure to the valve closure device 38. The desired temperature value of the water flowing through the heat exchanger 3 through the water conduit on the secondary side is adjustable by this cap 39. The measuring nozzle 7 is further provided with a by-pass channel, not shown. , the opening width of which is dimensioned such that when the hot water drain through the drain valve 8 is stopped, i. when the drain valve 8 closes, a minimum opening of the flow adjustment valve 4 is maintained.

2020

Fig. 3 viser, i form af et forstørret udsnit af flowjusteringsventilen 4, en ændring, der omfatter indførelsen af en elastisk guromifjeder i form af en O-ring 43 som erstatning for spiralfjederen 24, vist i fig. 2.FIG. 3 shows, in the form of an enlarged section of the flow adjustment valve 4, a change which includes the introduction of an elastic guromy spring in the form of an O-ring 43 to replace the coil spring 24, shown in FIG. 2nd

2525

Den viste reguleringsenheds virkemåde er som følger: Så længe aftapningsventilen 8 er lukket, strømmer der ingen vand gennem vandledningen 5, således at der ikke dannes no-30 get differenstryk ved måledysen 7 på grund af by-pass kanalen. Trykket i kamrene 10 og 11 er derfor ens, så kraften af bælgen 30, svarende til damptrykket der udøves af teropera-turføleren 6 i mellemrummet mellem huset 29 og bælgen 30, overføres ved hjælp af ventilstemplet 14, imod kraften fra 35 fjederen 21, til lukkeanordningen 18 i flowjusteringsventi-len 4 i dennes lukkeretning. Fjederens kraft er indstillet sådan, at ventillukkeanordningen 18 opretholder en strøm af varmt vand, der svarer til en varmtvandstemperatur på sekun- 7 DK PR 172443 B1 dærsiden af varmeveksleren 3 i vandledningen 5 på omkring 35°C.The operation of the control unit shown is as follows: As long as the drain valve 8 is closed, no water flows through the water line 5, so that no differential pressure is formed at the measuring nozzle 7 due to the by-pass channel. The pressure in the chambers 10 and 11 is therefore equal, so that the force of the bellows 30, corresponding to the vapor pressure exerted by the theroperature sensor 6 in the space between the housing 29 and the bellows 30, is transferred by means of the valve piston 14, against the force of the spring 21, to the closing device 18 in the flow adjustment valve 4 in its closing direction. The power of the spring is adjusted such that the valve closure device 18 maintains a flow of hot water corresponding to a hot water temperature on the second side of the heat exchanger 3 in the water line 5 of about 35 ° C.

Når aftapningsventilen 8 åbnes, strømmer det kolde vand fra 5 vandforsyningssystemet, via vandledningen 5, gennem måledysen 7 og sekundærsiden af varmeveksleren 3 forbi temperaturføleren 6. Selv før temperaturføleren 6 registrerer et tilsvarende fald i varmtvandstemperaturen, opstår der et differenstryk på måledysen 7; dette tryk bevæger membranen 9, 10 hjulpet af kraften af fjederen 21, i lukkeanordningens 18 åbneretning imod kraften af damptrykket genereret af temperaturføleren 6. Flowjusteringsventilen 4 åbnes således yderligere, svarende til differenstrykket ved måledysen 7, så strømmen af opvarmet vand gennem varmevekslerens 3 primærsi-15 de forøges. Virkningen heraf er en stigning i temperaturen på vandet i vandledningen 5 og en tilsvarende stigning i damptrykket genereret af temperaturføleren 6. Imidlertid stiger differenstrykket ved måledysen 7 kun til en ønsket temperaturværdi indstillet med hætten 39, der kan indstilles 20 til fx 50°C. I ligevægtstilstanden af de kræfter, der påvirker lukkeanordningen 18 i flowjusteringsventilen 4, er strømmen gennem flowjusteringsventilen 4 sådan, at temperaturen målt af temperaturføleren 6 svarer til den ønskede værdi.When the drain valve 8 is opened, the cold water flows from the water supply system, via the water line 5, through the measuring nozzle 7 and the secondary side of the heat exchanger 3 past the temperature sensor 6. Even before the temperature sensor 6 detects a corresponding decrease in the hot water temperature, a differential pressure occurs on the measuring nozzle 7; this pressure moves the diaphragm 9, 10 aided by the force of the spring 21, in the opening direction of the closing device 18, against the force of the vapor pressure generated by the temperature sensor 6. Thus, the flow adjustment valve 4 is further opened, corresponding to the differential pressure at the measuring nozzle 7, so that the flow of heated water through the heat exchanger 3 15 they increase. The effect of this is an increase in the temperature of the water in the water line 5 and a corresponding increase in the vapor pressure generated by the temperature sensor 6. However, the differential pressure at the measuring nozzle 7 increases only to a desired temperature value set with the cap 39 which can be adjusted 20 to, for example, 50 ° C. In the equilibrium state of the forces affecting the closing device 18 in the flow adjustment valve 4, the flow through the flow adjustment valve 4 is such that the temperature measured by the temperature sensor 6 corresponds to the desired value.

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Ringen 22 ligger først an mod fjederen 24 eller 43 lige inden lukkeanordningen 18 har nået sin lukkestilling, så fjederen 24 eller 43 bliver først virksom, lige inden flowjusteringsventilen lukker. Derfor opnås en stabil styring ved 30 ekstreme belastninger. En ekstrem belastningssituation kan omfatte en meget høj varmtvandstemperatur på primærsiden af varmeveksleren 3 og et meget højt differenstryk ved måledysen 7, medens små mængder brugsvand aftappes pr. tidsenhed. Flowjusteringsventilens 4 karakteristik, dvs., den åbnings-35 breddes afhængighed af lukkeanordningens 18 vandring skulle, om så var, være eksponentiel. Opnåelsen af en sådan karakteristik er vanskelig og dyr. Anvendelsen af den yderligere fjeder 24 eller 43 unødvendiggør en sådan opnåelse, ved at 8 DK PR 172443 B1 den nødvendige kraft til lukning af flowjusteringsventilen stiger stejlt lige før lukkestillingen nås. Denne stigning i lukkekraften gør, at en stabil styring kan opnås i de nævnte ekstreme belastningssituationer.The ring 22 first abuts the spring 24 or 43 just before the closing device 18 has reached its closing position, so that the spring 24 or 43 first becomes effective just before the flow adjustment valve closes. Therefore, stable control is achieved at 30 extreme loads. An extreme load situation may include a very high hot water temperature on the primary side of the heat exchanger 3 and a very high differential pressure at the measuring nozzle 7, while small amounts of tap water are drained per minute. unit of time. The characteristic of the flow adjustment valve 4, that is, the opening width's dependence on the passage of the closing device 18, if so, should be exponential. Obtaining such a characteristic is difficult and expensive. The use of the additional spring 24 or 43 necessitates such an accomplishment by increasing steeply the required force for closing the flow adjustment valve just before the closing position is reached. This increase in the closing force means that a stable control can be obtained in the mentioned extreme load situations.

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Trykket af det varme vand, der påvirker lukkeanordningen 18 i åbneretningen virker samtidig, via boringerne 25, 28 og 27 også på den side af lukkeanordningen, der vender væk fra ventilsædet 17, så det ikke har nogen indflydelse på de 10 kræfter, der aktiverer lukkeanordningen 18.The pressure of the hot water affecting the closing device 18 in the opening direction acts simultaneously, via the bores 25, 28 and 27, also on the side of the closing device facing away from the valve seat 17, so that it has no influence on the 10 forces activating the closing device. 18th

Det indvendige af bælgen 30 er i forbindelse med atmosfæren via en udluftningsboring, ikke vist, i grundpladen 32. Det indvendige af huset 15 er ligeledes i forbindelse med atmo-15 sfæren via en boring 44.The interior of the bellows 30 is connected to the atmosphere via a vent bore, not shown, in the base plate 32. The interior of the housing 15 is also connected to the atmosphere via a bore 44.

I den illustrerede og beskrevne reguleringsenhed bliver der tilsvarende løbende kompenseret for indflydelsen af vandstrømmen gennem vandledningen 5 på temperaturen på sekun-20 dærsiden af varmeveksleren 3, i overensstemmelse med størrelsen af gennemstrømningen.In the illustrated and described control unit, the influence of the flow of water through the water conduit 5 on the temperature of the secondary side of the heat exchanger 3 is continuously compensated continuously, according to the size of the flow.

Claims

1. A control unit for the temperature of water from one in 5 water pipe (5), with a heat exchanger (3) whose primary side is in series with a flow adjustment valve (4) in a hot water circuit (2), and through whose secondary side In the water pipe ( 5) passes, with a temperature sensor (6), which measures the water temperature in the water line (5) downstream 10 of the heat exchanger (3) and converts it to a pressure acting on the closing device (18) in the flow adjustment valve (4) against the force of a spring (21) abutting the housing (16) of the flow adjustment valve (4) and having a measuring nozzle (7) disposed in the water conduit (5), whereby the flow adjustment valve (4) comprises a diaphragm (9) between two chambers (10). , 11), of which one (10) is connected to the high pressure side of the crude nozzle (7) and the other (11) is connected to the low pressure! the pressure side of the measuring nozzle (7) and the deflection of the diaphragm (9) caused by the differential pressure on the measuring nozzle (7) acts against the pressure of the temperature sensor (6) on the flow adjustment valve (4) closing device (18), characterized in that the diaphragm (9) is fixed connected to the closing device (18) in the flow adjusting valve (4) in its closing direction, and that its deflection in the opening direction 25 of the flow adjusting valve (4) is continuously coordinated with the pressure difference at the measuring pressure (7) and the difference between the spring force and the pressure force in the temperature sensor (6).

A control unit according to claim 1, characterized in that the measuring nozzle (7) is arranged upstream of the water line (5) relative to the temperature sensor (6). 10 DK PR 172443 B1

A control unit according to claim 1 or 2, characterized in that the opening of the measuring nozzle (7) is limited by a valve seat cooperating with a closing device (38), which is biased in the closing direction by a spring (37) with an adjustable spring force against the flow of water through the measuring nozzle (7).

A control unit according to claim 3, characterized in that the measuring nozzle (7) has a by-pass channel, the opening width of which is dimensioned such that if the hot water drain is interrupted, a minimum opening of the flow adjustment valve (4) is maintained. 15

A control unit according to one of claims 1 to 4, characterized in that the closing device (18) in the flow adjustment valve (4), just before it reaches its closing position, is biased in the opening direction with an increased spring force (24; 43).