DK175927B1

DK175927B1 - Adjustable control insert with safety device

Info

Publication number: DK175927B1
Application number: DK200301524A
Authority: DK
Inventors: Peter Moesby
Original assignee: Flowcon Int As
Priority date: 2003-10-16
Filing date: 2003-10-16
Publication date: 2005-07-11
Also published as: WO2005038315A1; DK200301524A

Description

DK 175927 B1DK 175927 B1

Justerbar reguleringsindsats med sikkerhedsanordningAdjustable control insert with safety device

Opfindelsen angår en justerbar reguleringsindsats som angivet i indledningen til kravl.The invention relates to an adjustable control insert as set forth in the preamble of claim 1.

' 5'5

En sådan reguleringsindsats kendes fra f.eks. WO 95/12082, som viser en reguleringsindsats, der omfatter et hus, som i den ene ende er forsynet med radiære indstrømningsåbninger og i den anden ende er forsynet med radiære og i aksial retning forløbende spalteformede udstrømningsåbninger. Ind-10 satsen er indrettet med en rullemembran, der i afhængighed af trykdifferencen over indsatsen aflukker udstrømningsåbningeme mere eller mindre, således at der opnås en i det væsentlige konstant væskestrømning gennem indsatsen. Rullemembranen er påvirket af to modsatrettede kræfter, nemlig på den side, hvor udstrømningsåbningeme er placeret, af trykket inde i ind-15 satsen og en skruefjeder, der søger at holder udstrømningsåbningeme åbne, og på den modsatte side af trykket umiddelbart uden for indsatsens indstrømningsåbninger, idet der er tilvejebragt væskeforbindelse herimellem.Such a regulatory effort is known from e.g. WO 95/12082, which shows a control insert comprising a housing provided at one end with radial inflow openings and at the other end provided with radial and axially extending slot shaped openings. The insert is provided with a roller diaphragm which, depending on the pressure difference across the insert, closes the outlet openings more or less so that a substantially constant fluid flow through the insert is obtained. The roller diaphragm is affected by two opposite forces, namely, on the side where the outlet openings are located, on the pressure inside the insert and a coil spring which seeks to keep the outlet openings open, and on the opposite side of the pressure immediately outside the inlet openings of the cartridge, providing fluid connection therebetween.

Ved en given trykdifference over indsatsen vil rullemembranen indstille sig i en ligevægt mellem disse kræfter, der bevirker en konstant væskestrømning 20 gennem indsatsen. I den viste reguleringsindsats kan det samlede areal af indstrømningsåbningeme fomdindstilles trinvis til en ønsket konstant væske-1 strømning gennem indsatsen.At a given pressure difference across the insert, the roller diaphragm will settle in an equilibrium between these forces causing a constant fluid flow 20 through the insert. In the control insert shown, the total area of the inflow openings can be adjusted stepwise to a desired constant liquid-1 flow through the insert.

iin

Forudindstillingen af det samlede areal af indstrømningsåbningeme i den 25 ovenfor beskrevne reguleringsindsats skal foretages, før den monteres i et ventilhus. Det vil sige, at reguleringsindsatsen indstilles til den aktuelle situation, og den kan derefter kun justeres ved afmontering fra anlægget, hvilket endvidere indebærer, at al væske skal tømmes af anlægget. Fra US-A-5 178 DK 175927 B1 2 324 kendes dog en tilsvarende reguleringsanordning, som ikke er udformet som en særskilt indsats, men som er indbygget i et ventilhus, og som via en udragende aksel kan justeres udefra, uden det er nødvendigt at afmontere den fra anlægget. Det er herved muligt at efterjustere det samlede areal af 5 indstrømningsåbningeme, således at indsatsen nemt kan tilpasses en ny si- v tuation med et nyt væskegennemstrømningsbehov. Denne reguleringsanordning har imidlertid den ulempe, at akslen vil kunne spændes så hårdt, at reguleringsanordningen ødelægges, eller at den del, der aflukker indstrømningsåbningeme, skrues ud af indgrebet med akslen.The pre-setting of the total area of the inflow openings in the control described above must be made before it is mounted in a valve housing. That is, the control effort is adjusted to the current situation, and it can then only be adjusted by removal from the system, which also means that all liquid must be emptied by the system. However, from US-A-5 178 DK 175927 B1 2 324, a corresponding control device is known which is not designed as a separate insert, but which is built into a valve housing and which can be adjusted from the outside via a protruding shaft without the need to remove it from the system. In this way, it is possible to adjust the total area of the 5 inflow openings so that the insert can easily be adapted to a new situation with a new fluid flow requirement. However, this control device has the disadvantage that the shaft can be tightened so hard that the control device is damaged or the part closing the inflow openings is unscrewed from the engagement with the shaft.

1010

Formålet med opfindelsen er, at anvise en reguleringsindsats af den indledningsvis nævnte type, hvor ovennævnte problem ikke kan optræde.The object of the invention is to provide a regulating effort of the type mentioned in the introduction, where the above problem cannot occur.

Dette opnås ved, at indrette reguleringsindsatsen som angivet i krav 1’s 15 kendetegnende del.This is accomplished by arranging the regulatory effort as set forth in claim 1's 15 features.

Herved opnås, at hvis akslen spændes for hårdt den ene vej, vil medbringerens anlæg mod kappens vulst medføre, at bøsningen forskydes udad på akslen ved en fortsat rotation heraf, hvilket dog kun kan ske, indtil bøsningen 20 er forskudt så langt ud over akslens blottede ydre ende, at indgreb hermed ikke længere er muligt.Hereby it is obtained that if the shaft is tensioned too hard one way, the bearing of the carrier against the bead of the sheath will cause the bushing to be displaced outwards on the shaft by a continuous rotation thereof, which can only happen until the bushing 20 is displaced so far beyond the exposed shaft. outer end, that intervention with it is no longer possible.

r Særlig fordelagtige udførelsesformer for opfindelsen er angivet i de uselv- ' stændige krav.Particularly advantageous embodiments of the invention are set forth in the dependent claims.

2525

Opfindelsen skal nu forklares nærmere med henvisning til tegningen, hvor 3 DK 175927 B1 fig. 1 viser et tværsnit en reguleringsventil med en reguleringsindsats, der er indrettet i overensstemmelse med opfindelsen, fig. 2a viser en reguleringsindsats ifølge opfindelsen set fra siden i en første j 5 indstilling, fig. 2b viser et tværsnit af reguleringsindsatsen vist i fig. 2a, fig. 3a viser en reguleringsindsats ifølge opfindelsen set fra siden i en anden 10 indstilling, fig. 3b viser et tværsnit af reguleringsindsatsen vist i fig. 2a, og fig. 4 viser et tværsnit af reguleringsindsatsen vist i fig. 1-3b i en tredje positl·-15 on.The invention will now be explained in more detail with reference to the drawing, in which FIG. 1 is a cross-sectional view of a control valve with a control insert arranged in accordance with the invention; FIG. 2a shows a side view of a control insert according to the invention in a first position, FIG. 2b shows a cross section of the control insert shown in FIG. 2a, fig. Fig. 3a shows a side view of a control insert according to the invention in another setting; 3b shows a cross section of the control insert shown in FIG. 2a, and FIG. 4 is a cross-sectional view of the control insert shown in FIG. 1-3b in a third positl · -15 on.

Fig. 1 viser et tværsnit en reguleringsventil 1 med en reguleringsindsats 2, der er indrettet i overensstemmelse med opfindelsen. Reguleringsventilen 1 omfatter et ventilhus 3, der typisk er støbt af f.eks. messing. Ventilhuset 3 20 omfatter en indløbsdel 4 og en udløbsdel 5, som ligger på linie, og som via et indvendigt gevind (ikke vist) kan sammenkobles med to rør i det anlæg, hvor , reguleringsventilen 1 anvendes.FIG. 1 is a cross-sectional view of a control valve 1 with a control insert 2 arranged in accordance with the invention. The control valve 1 comprises a valve housing 3 which is typically molded by e.g. brass. The valve housing 3 20 comprises an inlet portion 4 and an outlet portion 5 which are aligned and which can be connected via an internal thread (not shown) to two pipes in the plant where the control valve 1 is used.

Reguleringsindsatsen 2 - eller blot indsatsen 2 - er anbragt i et skråtstillet 25 sæde i ventilhuset 3 og er monteret via samvirkende gevind mellem ventilhuset 3 og en monteringsbøsning 6 på indsatsen 2, således som det er almindeligt kendt. Det er ikke væsentligt, at indsatsen 2 er skråtstillet i ventilhuset 3, idet den ligesåvel kunne være placeret anderledes.The control insert 2 - or simply the insert 2 - is arranged in an inclined 25 seat in the valve housing 3 and is mounted via cooperating threads between the valve housing 3 and a mounting sleeve 6 on the insert 2, as is generally known. It is not essential that the insert 2 is inclined in the valve housing 3, as it could equally well be positioned differently.

m 4 DK 175927 B1m 4 DK 175927 B1

Udover monteringsbøsningen 6 omfatter indsatsen 2 en kopformet gennemstrømningsdel 7 med indstrømningsåbninger 8 og udstrømningsåbninger 9. Indstrømningsåbningerne 8 kan justeres trinløst til en ønsket gennemstrøm-5 ning over indsatsen 2, idet der indvendigt i den kopformede gennemstrøm-ningsdel 7 er tilvejebragt et i aksial retning forskydeligt aflukningsskørt 10. Aflukningsskørtet 10 har et indre nav 11, der er i gevindindgreb med en spindel 12, der strækker sig gennem hele den kopformede del 7. Når spindlen 12 roteres, som det bliver beskrevet senere, vil aflukningsskørtet 10 for-10 skydes op eller ned i den kopformede del 7 og dermed forøge eller formindske det samlede areal af indstrømningsåbningeme 8.In addition to the mounting sleeve 6, the insert 2 comprises a cup-shaped flow portion 7 with inflow openings 8 and outflow openings 9. The inflow openings 8 can be adjusted steplessly to a desired flow 5 over the insert 2, providing inside the cup-shaped flow portion 7 in an axially displaced direction. closure skirt 10. The closure skirt 10 has an inner hub 11 which is engaged with a spindle 12 extending through the entire cup-shaped portion 7. As the spindle 12 is rotated, as will be described later, the closure skirt 10 will slide up or down. down into the cup-shaped portion 7 thereby increasing or decreasing the total area of the inflow openings 8.

Ved udstrømningsåbningeme 9 er der tilvejebragt en rullemembran 13, der aflukker udstrømningsåbningeme 9 mere eller mindre, afhængig af trykfor-15 holdene over og gennem indsatsen 2. Rullemembranen 13 er ved sin ydre perifere kant fastgjort mellem monteringsbøsningen 6 og den kopformede del 7, mens den indre perifere kant er fastgjort til en hætte 14, der er anbragt rotationsfrit og aksialt forskydeligt på spindlen 12. En skruefjeder 15 er anbragt mellem aflukningsskørtet 7’s nav 11 og hætten 14.At the outflow apertures 9, a roller diaphragm 13 is provided which closes the outflow apertures 9 more or less, depending on the pressure conditions over and through the insert 2. The diaphragm 13 is secured at its outer peripheral edge between the mounting sleeve 6 and the cup-shaped portion 7. inner peripheral edge is attached to a cap 14 which is rotationally and axially displaceable on the spindle 12. A coil spring 15 is disposed between the hub 11 of the closure skirt 7 and the cap 14.

2020

Spindlen 12 har en central hulhed 16, der i den ene ende står i åben forbindelse med ventilhuset 3’s indløbsdel 4 og i den anden ende står i åben for- r bindelse med et rum 17 over rullemembranen 13. Aflukningen af udstrømningsåbningeme 9 er således bestemt ved de til enhver tid gældende tryk-25 forhold over og gennem indsatsen, idet hætten 14 vil indstille sig i position med ligevægt mellem trykket i væsken på hver side af rullemembranen 13 og fjederkraften fra fjederen 15.The spindle 12 has a central cavity 16 which at one end is in open communication with the inlet part 4 of the valve housing 3 and at the other end is in open contact with a space 17 over the rolling membrane 13. The closure of the outflow openings 9 is thus determined by the pressure ratio prevailing at all times over and through the insert, the cap 14 will adjust to a position of equilibrium between the pressure in the fluid on each side of the roller diaphragm 13 and the spring force from the spring 15.

5 DK 175927 B1 På den udvendige side af monteringsbøsningen 6 er der tilvejebragt en ju-. steringsindretning, som omfatter en central aksel 18, der er i rotationsfast indgreb med spindlen 12, der strækker sig ned i den kopformede del 7. Den centrale spindel 18 er roterbart lejret i monteringsbøsningen 6, og rotation af j 5 akslen 18 medfører en rotation af spindlen 12, hvorved aflukningsskørtet 10 forskydes op eller ned via de samvirkende gevind på spindlen 12 og aflukningsskørtet 10’s nav 11. Rotation af akslen 18 sker ved hjælp af en nøgle 28 (vist med stiplede linier i fig. 4), som passer rotationsfast med akslen 18’s blottede ydre ende 19, der fortrinsvis har et kvadratisk tværsnit.5 DK 175927 B1 On the outer side of the mounting sleeve 6 a ju. staging device comprising a central shaft 18 which is rotationally engaged with the spindle 12 extending down into the cup-shaped portion 7. The central spindle 18 is rotatably mounted in the mounting bush 6 and rotation of the shaft 18 results in a rotation of the spindle 12, whereby the closure skirt 10 is moved up or down via the cooperating threads on the spindle 12 and the hub 11. The rotation of the shaft 18 takes place by means of a key 28 (shown in broken lines in Fig. 4) which fits rotationally with the shaft. 18's exposed outer end 19, which preferably has a square cross-section.

1010

Akslen 18 er i rotationsfast indgreb med en bøsning 20, der er forsynet med et udvendigt gevind. Udvendigt på bøsningen 20 og i gevindindgreb hermed er der tilvejebragt en ringformet medbringer 21 med en indikatortap 22. Indikatortappen 22 er anbragt aksialt forskydeligt i et spor 23 i en udvendig kap-15 pe 24. Når akslen 18 roteres, forskydes medbringeren 21 proportionalt op eller ned, mens indikatortappen 22 kan ses i sporet 23, hvorved åbningsgraden af indstrømningsåbningeme 8 kan aflæses.The shaft 18 is rotationally engaged with a bush 20 provided with an external thread. Externally on the bush 20 and threadedly there is provided an annular carrier 21 with an indicator pin 22. The indicator pin 22 is disposed axially slidably in a groove 23 in an outer cap 24. When the shaft 18 is rotated, the carrier 21 is displaced proportionally or down, while the indicator pin 22 can be seen in the groove 23, whereby the degree of opening of the inflow openings 8 can be read.

En dækhætte 25 er i den viste driftsstilling monteret over den blottede ydre 20 ende 19 af akslen 18, således at der opnås et attraktivt udseende. Herudover er der tilvejebragt diverse pakningsringe (O-ringe) i indsatsen 2 og mel-, lem indsatsen 2 og ventilhuset 3. Sådanne pakningsringe er almindeligt kendte og vil ikke blive beskrevet nærmere her.A tire cap 25 is mounted in the shown operating position over the exposed outer end 19 of the shaft 18 so as to obtain an attractive appearance. In addition, various packing rings (O-rings) are provided in the insert 2 and between the insert 2 and the valve housing 3. Such packing rings are generally known and will not be described further herein.

25 Justeringsmekanismen vil nu blive beskrevet nærmere med henvisning til fig.25 The adjustment mechanism will now be described in more detail with reference to FIG.

2a, 2b, 3a og 3b, idet fig. 2a og 2b viser indsatsen 2 set fra siden og i tværsnit ved en første indstilling af indstrømningsåbningeme 8 på 1,2, og fig. 3a og 3b viser indsatsen 2 set fra siden og i tværsnit ved en anden indstilling af DK 175927 B1 6 indstrømningsåbningerne 8 på 4,2. Som det ses af fig. 2a og 3a, kan aflukningsgraden af indstrømningsåbningerne 8 aflæses på en lineær skala, hvor heltalsværdien kan aflæses ved siden af sporet 23 ud for indikatortappen 22, mens decimalen kan aflæses på den øvre del af det roterbare skørt 20. Fra 5 indstillingen vist i fig. 2a og 2b (1,2) er akslen 18 altså roteret tre omgange for at nå indstillingen vist i fig. 3a og 3b (4,2). Det betyder at, aflukningsskørtet 10 er blevet forskudt relativt tilsvarende ind i den kopformede del 7, således som det også tydeligt fremgår af fig. 3a, og det samlede areal af ind-strømningsåbningeme 8 er blevet forøget.2a, 2b, 3a and 3b, FIG. 2a and 2b show the insert 2 seen from the side and in cross section at a first adjustment of the inflow openings 8 of 1.2, and fig. 3a and 3b show the insert 2 seen from the side and in cross section at another setting of the inflow openings 8 of 4.2. As seen in FIG. 2a and 3a, the degree of closure of the inflow apertures 8 can be read on a linear scale, where the integer value can be read next to the groove 23 next to the indicator pin 22, while the decimal can be read on the upper part of the rotatable skirt 20. From the setting shown in FIG. 2a and 2b (1,2), shaft 18 is thus rotated three turns to reach the setting shown in FIG. 3a and 3b (4.2). This means that the closure skirt 10 has been displaced relatively similarly into the cup-shaped portion 7, as is also clearly seen in FIG. 3a, and the total area of the inflow openings 8 has been increased.

10 I den viste udførelsesform er gevindstigningen på bøsningen 20 større gevindstigningen på spindlen 12, hvilket betyder, at den absolutte forskydning af aflukningsskørtet 10 ikke svarer til den absolutte forskydning af medbringeren 21. Det har dog ingen betydning i forhold til opfindelsen, men medfø-15 rer blot, at den udvendige skala bliver lettere af aflæse.In the illustrated embodiment, the thread pitch of bush 20 is greater than the thread pitch of spindle 12, which means that the absolute displacement of the closure skirt 10 does not correspond to the absolute displacement of the carrier 21. However, it is of no significance to the invention, but to the accompanying just make the outside scale easier to read.

I overensstemmelse med opfindelsen er indstillingsmekanismen indrettet således, at det ikke er muligt at skrue aflukningsskørtet 10 helt i bund i den kopformede del 7, og risikoen for at beskadige indsatsen 2 på denne måde 20 er derved elimineret. Mekanismen vil blive beskrevet med henvisning til fig.In accordance with the invention, the adjusting mechanism is arranged so that it is not possible to screw the closure skirt 10 completely into the cup-shaped part 7, and the risk of damaging the insert 2 in this way 20 is thereby eliminated. The mechanism will be described with reference to FIG.

4, der viser et tværsnit af indsatsen, hvor det ikke længere er muligt at få nøglen 28 til at gå i indgreb med akslen 18's blottede ydre ende 19. Det bemærkes, at den dekorative dækhætte 25 er afmonteret.4, showing a cross-section of the insert where it is no longer possible to cause the key 28 to engage the exposed outer end 19. of the shaft 18. It is noted that the decorative cover cap 25 is removed.

i 25 I fig. 4 er akslen 18 allerede blevet skruet så mange omgange, at en udadra-gende krave 26 på medbringeren 21 ligger an mod en indadragende vulst 27 i indsatsen 2’s kappe 24. Da medbringeren 21 ikke kan rotere i forhold til kappen 24, bevirker dette indgreb mellem medbringeren 21 og kappen 24, at 7 DK 175927 B1 skørtet 20 vil blive forskudt opad i forhold til akslen 18 ved fortsat rotation heraf. På et tidspunkt er skørtet 20 forskudt så meget som vist i fig. 4, hvor den øverste del af skørtet 20 dækker akslen 18’s ydre ende 19. I denne stilling kan nøglen 28 (vist med stiplede linier) ikke længere gå i indgreb med • 5 akslen 18’s ydre ende 19, og videre rotation er ikke mulig. I praksis mister nøglen 28 mere og mere sit indgreb med akslen 18’s ydre ende 19 efterhånden som den skubbes op af bøsningen 20, indtil den ikke længere kan få fat.In FIG. 4, the shaft 18 has already been screwed so many turns that an outwardly extending collar 26 on the carrier 21 abuts an inwardly projecting bead 27 in the sheath 24. The carrier 21 cannot rotate relative to the sheath 24, this intervenes between the carrier 21 and the jacket 24, that the skirt 20 will be displaced upwardly relative to the shaft 18 by continued rotation thereof. At one point, the skirt 20 is displaced as much as shown in FIG. 4, where the upper part of the skirt 20 covers the outer end 19 of the shaft 18. In this position, the key 28 (shown in dashed lines) can no longer engage the outer end 19 of the shaft 18, and further rotation is not possible. In practice, the key 28 increasingly loses its engagement with the outer end 19 of the shaft 18 as it is pushed up by the bushing 20 until it can no longer be grasped.

Brugeren får derved en klar indikation om, at videre rotation af akslen 18 ikke må ske. Det er muligt at gribe forsigtigt om bøsningen 20’s udragende del og 10 forsigtigt rotere den den modsatte vej, mens akslen 18 drives med. Når akslen 18's ydre ende 19 igen er tilstrækkeligt blottet kan nøglen 28 igen anvendes.The user is thereby given a clear indication that further rotation of the shaft 18 must not occur. It is possible to gently grip the protruding portion of the bushing 20 and gently rotate it the opposite way while the shaft 18 is driven. When the outer end 19 of the shaft 18 is again sufficiently exposed, the key 28 can again be used.

Opfindelsen er blevet beskrevet med henvisning til en foretrukket udførelses-15 form form en reguleringsindsats. Opfindelsen finder dog også anvendelse i andre typer af justerbare reguleringsindsatser, hvor det ønskes at minimere risikoen for at ødelægge reguleringsindsatsen, hvis justeringsindretningen skrues for meget den ene vej.The invention has been described with reference to a preferred embodiment of a control insert. However, the invention also applies to other types of adjustable control inserts, where it is desired to minimize the risk of damaging the regulatory action if the adjusting device is screwed too much one way.

2020

Claims

An adjustable regulating insert (2) for valves, in particular for controlling fluid flow in a central heating or air conditioning system, said insert (2) comprising a cup-shaped part (7) with inflow openings (8) and outflow openings (9), the outflow openings ( 9) is closed in dependence on the pressure difference across the insert (2) under the action of a spring (15) which seeks to keep the outlet openings (9) open, which insert (2) is further provided with means for adjustable closing of the inlet openings (10). 8) which comprises a shaft (24) rotatable relative to a sheath (24) having an outer end (19) exposed to the surroundings, characterized in that the insert (2) further comprises - one relative to the sheath (24) loose bush (20) which is rotationally fixed but axially displaceable with the shaft (18), said bush (20) being provided with an external thread, - a carrier (21) provided with an internal thread which is provided with intervention m with the outer threads of the sleeve (20), which are in rotationally but axially displaceable engagement with the sheath (24), providing an inwardly extending bead (27) in the sheath (24), as in an outer position of the carrier ( 21) further prevents axial displacement thereof by continuing rotation of the shaft (18) in one direction, whereby the cooperating threads on the bushing (20) and the carrier (21) respectively cause the bushing (20) to move axially outwards on the shaft (18) towards its exposed outer end (19). 25

Insert according to claim 1, characterized in that the inflow openings (8) are prevented from being completely closed when the bushing (20) prevents engagement with the exposed outer end (19) of the shaft (18).