SE438545B

SE438545B - FLUID FLOW MONITOR FOR USE IN AN ANGLE AND USE OF SUCH A FLUID FLOW MONITOR FOR MONITORING AN ANGLE CELL

Info

Publication number: SE438545B
Application number: SE7904695A
Authority: SE
Inventors: R K Fear; R E Bridges
Original assignee: Spirax Sarco Ltd
Priority date: 1978-05-30
Filing date: 1979-05-29
Publication date: 1985-04-22
Also published as: BE876501A; AR218976A1; SE7904695L; IT1120926B; FR2427593A1; DE2920520A1; CA1141989A; JPS54157333A; AU522592B2; BR7903280A; DE2920520C2; IN150843B; DK224679A; MX148213A; NL7904222A; IL57334A0; FR2427593B1; ZA792203B; AU4688879A; ES481114A1

Description

7904695-9 upptill i kamaren, så att kondensat kan samlas i kamma- rens undre del, vilket gör utförandet lämpat att anordna i en horisontell ledning. 7904695-9 at the top of the chamber, so that condensate can collect in the lower part of the chamber, which makes the design suitable for arranging in a horizontal pipe.

Vid utförandet enligt figurerna 1 och 2 är en enda skärm 5 anordnad mellan inloppet 2 och utloppet 3 och denna sträcker sig från taket i kammaren l ned i den del av kam- maren, i vilken kondensat kan samlas. Skärmen slutar ett litet stycke över kammarens botten och har en genomgående öppning 5A på i huvudsak samma nivå som in- och utloppen.In the embodiment according to Figures 1 and 2, a single screen 5 is arranged between the inlet 2 and the outlet 3 and this extends from the ceiling in the chamber 1 down into the part of the chamber in which condensate can collect. The screen ends a short distance above the bottom of the chamber and has a through opening 5A at substantially the same level as the inlets and outlets.

Skärmen visas vertikal, men kan naturligtvis vara anordnad .snett.The screen is displayed vertically, but can of course be arranged .snett.

I den del av kammarens l vägg, inom vilken kondensat kan samlas, är en elektrod 6 anordnad i en elektriskt le- dande sockel 7, elektriskt isolerad från denna, så att en ände skjuter in i kammaren i det omrâde där kondensat kan samlas, det vill säga under nivån för inlopp och avlopp.In the part of the wall of the chamber 1 within which condensate can be collected, an electrode 6 is arranged in an electrically conductive socket 7, electrically isolated therefrom, so that one end projects into the chamber in the area where condensate can be collected. that is, below the level of inlet and drain.

I utförandet enligt figurerna 3 och 4 ligger inloppet 2 i kammarens l tak och utloppet 3 vid kammarens botten i anslutning till ett rör 3A, som bildar ett breddavlopp i kamaren och vars övre kant bestämmer den nivå, till vil- ken kondensat 4 kan samlas i kammaren. Röret 3A är place- rat inom en från botten uppskjutánde skärm 50, som omger röret 3A på avstånd från detta. Skärmen avslutas nedtill vid 8 på något avstånd från kammarens l botten och har upptill en öppning SOA, som bildar fri genomgång från in- loppet till utloppet. Som vid det i fig. l och 2 visade utförandet har utförandet enligt fig. 3 och 4 i den del av kammaren, i vilken kondensat kan samlas, en elektrod 6 som skjuter in i kammaren nedanför övre änden av utloppet från kammaren vid övre änden av röret 3A. Den elektriskt ledande sockeln 7 står i förbindelse med kammarens inre.In the embodiment according to Figures 3 and 4, the inlet 2 lies in the roof of the chamber 1 and the outlet 3 at the bottom of the chamber adjacent to a pipe 3A, which forms a width drain in the chamber and whose upper edge determines the level to which condensate 4 can collect in the chamber. The tube 3A is located within a screen 50 projecting from the bottom, which surrounds the tube 3A at a distance therefrom. The screen terminates at the bottom at 8 at some distance from the bottom of the chamber 1 and has at the top an opening SOA, which forms a free passage from the inlet to the outlet. As in the embodiment shown in Figs. 1 and 2, the embodiment according to Figs. 3 and 4 has in the part of the chamber in which condensate can collect, an electrode 6 projecting into the chamber below the upper end of the outlet from the chamber at the upper end of tube 3A. The electrically conductive base 7 communicates with the interior of the chamber.

Elektroden 6 och sockeln 7 är anslutna till en ström- -källa i en sådan koppling med indikatorlampor 9 i en appa- ratlåda 10 att en av lamporna (exempelvis grön), är tänd om en strömkrets via elektroden 6 och sockeln 7 är sluten via kondensat i behållaren, medan en annan lampa (exem- pelvis röd) är tänd om elektroden inte ligger i vatten.The electrode 6 and the socket 7 are connected to a current source in such a connection with indicator lamps 9 in an apparatus box 10 that one of the lamps (for example green) is lit if a circuit via the electrode 6 and the socket 7 is closed via condensate in the container, while another lamp (for example, red) is lit if the electrode is not in water.

Det är klart att också andra medel kan vara anordnade för att konstatera förekomst av vatten i nivå med elektroden 7904695-9 6, så att en strömkrets sluts via denna elektrod: Fig. 1 visar strömningsvakten som om den vore i använd- ning med utloppet 3 anslutet till inloppet hos en ångfälla, så att den ångström som skall gå genom ångfällan går genom strömningsvakten. Som visat i fig. l förekommer kondensat i kammaren l till samma nivå (i linje med inloppet 2) på sidor om skärmen 5A när ångfällan är stängd, varvid ström- kretsen via elektroden 6 och sockeln 7 är sluten via kon- densatet.It is clear that other means can also be arranged to detect the presence of water at the level of the electrode 7904695-9 6, so that a circuit is closed via this electrode: Fig. 1 shows the flow monitor as if it were in use with the outlet 3 connected to the inlet of a steam trap, so that the steam stream which is to pass through the steam trap passes through the flow monitor. As shown in Fig. 1, condensate is present in the chamber 1 to the same level (in line with the inlet 2) on the sides of the screen 5A when the steam trap is closed, the circuit via the electrode 6 and the base 7 being closed via the condensate.

En mindre mängd ånga kommer att kondenseras i ångfällan .och i anslutningarna mellan ångfällan strömningsvakten. För kompensering av denna förlust kan en motsvarande mängd ånga gå genom öppningen 5A vid övre delen av skärmen 5 utan att störa kondensatnivåerna på ömse sidor om skärmen.A small amount of steam will condense in the steam trap and in the connections between the steam trap and the flow monitor. To compensate for this loss, a corresponding amount of steam can pass through the opening 5A at the upper part of the screen 5 without disturbing the condensate levels on either side of the screen.

Om mer kondensat strömmar till fällan, så att denna öppnar, töms strömningsvaktens kammare. Även om blott ringa mängd kondensat strömmar genom fällan är detta till- räckligt för att hålla nivån i strömningsvaktens kammare över elektroden.If more condensate flows into the trap, so that it opens, the flow monitor chamber is emptied. Even if only a small amount of condensate flows through the trap, this is sufficient to keep the level in the flow monitor chamber above the electrode.

Om emellertid mera ånga går genom ångfällan än normalt på grund av kondensationsförluster (det vill säga att ånga läcker igenom), uppträder ett tryckfall vid kammarens ut- lopp 3 på grund av denna ångström, vilket medför att nivån hos det samlade kondensatet 4 på nedströmsidan av skärmen stiger och en motsvarande sänkning av nivån på uppström- sidan uppträder, varvid strömbanan via elektroden bryts vid tillräckligt låg nivå, så att man får en annan indi- kation av lamporna 9. Man får sålunda en indikation av att ångläckningen har nått en viss storlek.However, if more steam passes through the steam trap than normal due to condensation losses (i.e. steam leaks through), a pressure drop occurs at the outlet 3 of the chamber due to this steam flow, which causes the level of the collected condensate 4 on the downstream side of the screen rises and a corresponding lowering of the level on the upstream side occurs, whereby the current path via the electrode is broken at a sufficiently low level, so that one gets another indication of the lamps 9. Thus one gets an indication that the steam leakage has reached a certain magnitude. .

Vattennivån uppströms skärmen 5 sjunker under elektro- den 6 även en mängd kondensat passerar tillsammans med den läckande ångan. Om exempelvis L00 kg/h kondensat ut- matas, men ångfällan fastnar i öppet läge, så att den utom att släppa igenom denna mängd kondensat låter 20 kg/h färskånga strömma igenom, kommer vattennivån i strömnings- vakten att sjunka, varmed tryckfallet och därmed läckan indikeras.The water level upstream of the screen 5 drops below the electrode 6 also a quantity of condensate passes along with the leaking steam. If, for example, L00 kg / h condensate is discharged, but the steam trap gets stuck in the open position, so that in addition to allowing this amount of condensate to let 20 kg / h fresh steam flow through, the water level in the flow monitor will drop, causing the pressure drop and thus the leak is indicated.

Som utförd enligt figurerna 3 och 4 arbetar strömnings- vakten på ett sätt motsvarande strömningsvakten enligt 7904695-9 fig. l och 2. Utloppet 3 är anslutet till inloppet hos en ångfälla, så att strömmen av ånga till fällan går via strömningsvakten. Som framgår av fig. 3 föreligger konden- sat i kammaren l till samma nivå (i linje med inloppet till förlängningsrörët 3A) på ömse sidor om skärmen när ångfällan är stängd, varför strömkretsen via elektroden 6 och sockeln 7 är sluten via kondensatet.As designed according to Figures 3 and 4, the flow monitor operates in a manner corresponding to the flow monitor according to Figures 1 and 2. The outlet 3 is connected to the inlet of a steam trap, so that the flow of steam to the trap goes via the flow monitor. As shown in Fig. 3, the condensate in the chamber 1 is at the same level (in line with the inlet to the extension tube 3A) on either side of the screen when the steam trap is closed, so the circuit via the electrode 6 and the base 7 is closed via the condensate.

För kompensation förlusten av den obetydliga mängd ånga som kondenserar i ångfällan och i kopplingarna mellan ångfällan och strömningsvakten kan en motsvarande mängd _ånga passera genom öppningen 50A och ut genom öppningen 3A utan att störa nivån hos kondensatet på ömse sidor om skärmen 50. Ett tryckfall i röret 3A på grund av utläckan- de ånga medför, som illustrerat av fig. 4, att nivån hos det samlade kondensatet ökas på nedströmssidan om skärmen 50 (det vill säga inom skärmen 50), samtidigt som en mot- svarande sänkning av kondensatnivån på skärmens uppströms- sida (det vill säga på utsidan av skärmen) på grund av att kondensat strömmar ut under skärmen 50 sjunker.To compensate for the loss of the insignificant amount of steam condensing in the steam trap and in the couplings between the steam trap and the flow monitor, a corresponding amount of steam can pass through the opening 50A and out through the opening 3A without disturbing the level of the condensate on either side of the screen 50. 3A due to leaking vapor, as illustrated in Fig. 4, causes the level of the collected condensate to increase on the downstream side of the screen 50 (i.e. within the screen 50), while a corresponding decrease in the condensate level on the screen upstream side (i.e. on the outside of the screen) due to condensate flowing out from under the screen 50 drops.

I en icke visad modifierad form av en strömningsvakt enligt figurerna 3 och 4 är det uppskjutande röret anord- nat vid ena Sidan av kammaren och skärmen anordnad mellan röret och kammarens andra sida, varvid skärmen har en del som skjuter ner från en vägg vid rörets övre ände och slu- tar strax ovanför botten i den del av kammaren, i vilken kondensat samlas, varvid ett mellanrum förefinns mellan väggen och röret och väggen har en genomgående öppning.In a modified form (not shown) of a flow monitor according to Figures 3 and 4, the projecting tube is arranged at one side of the chamber and the screen is arranged between the tube and the other side of the chamber, the screen having a part projecting down from a wall at the top of the tube end and ends just above the bottom in the part of the chamber in which condensate collects, a gap being present between the wall and the pipe and the wall having a through opening.

Verkan blir densamma som vid utförandet enligt figurerna 3 och 4.The effect will be the same as in the embodiment according to Figures 3 and 4.

Claims

7904695-9 Patent claims

1. A fluid flow monitor for use in a steam line and comprising a chamber (1) having an inlet (2) and an outlet (3), by means of which the chamber is connectable in a steam line to serve as a condensate container, characterized in that it between the inlet (2) and the outlet (3) has a screen (5, 50) in the part of the chamber in which condensate (4) can collect, which is arranged so that in operation a pressure drop caused by steam flow through the flow monitor at the outlet of the chamber, an increase in the level of condensate collected in the chamber on the outlet side of the screen with a corresponding decrease in the level of the condensate on the inlet side of the screen causes it to indicate a change in the condensate level to a predetermined extent generated pressure drop at the outlet has means (6, 7), comprising an electrode (6) extending into the interior of said part of the chamber, in which condensate can collect, which electrode (6) is electrically isolated from a electrical joint portion (9), which is arranged so that when changing the condensate level to a predetermined extent, caused by a pressure drop at the outlet of the flow monitor (3), it breaks an electrical circuit between the electrode via condensate to the electrically conductive portion (7), in order to provide an electrical indication for monitoring the flow of steam through the steam line.

2. A flow monitor according to claim 1, characterized in that the indicating device comprises a current source and a visual indicator for indicating the condensate level in the chamber (1) depending on the closing or opening of a current path through the electrode (6) via the electrode (6).

Flow monitor according to claim 2, characterized in that the visual indicator comprises lamps (9), which are optionally lit depending on the closing or breaking of the current path via condensate (4) in the chamber (1).

Flow monitor according to one of the preceding claims, characterized in that the inlet (2) and the outlet (3) are arranged at the same level in the chamber and that the screen (5) projects from the roof of the chamber in that part of the chamber. , in which condensate can collect, the screen ending near the bottom of the chamber and being provided with a through opening (SA), which is arranged substantially at the same level as the inlet (2) and the outlet (3).

5. » Flow monitor according to one of Claims 1 to 3, characterized in that the inlet (2) is arranged in the roof of the chamber (1) and that the outlet (3) is arranged at the bottom of the chamber, the outlet (3) being connected to a in the part of the chamber in which condensate can accumulate, projecting tube (3A), so that the upper end of this tube (3A) determines the level to which condensate can collect in the chamber, and wherein the screen (S0) has an upwardly directed portion , of which at least a part terminates near the bottom of the chamber and a part above the pipe (3A), the latter part having a through opening (SOA) at a distance from the pipe (3A).

Flow monitor according to claim 5, characterized in that the screen consists of a projecting wall (50), which stands on the bottom of the chamber and surrounds the pipe (3A) at a distance therefrom, a part of the projecting wall (50) forms the part which terminates near the bottom of the chamber (1) and the wall (50) has a through opening (SOA) in its otherwise closed upper end, which forms the part which is located above the tube (3A).

Use of a fluid flow monitor according to any one of the preceding claims for monitoring a steam trap, which flow monitor comprises a chamber (1) with an inlet (2) and an outlet (3), which connects the chamber to a steam line. to serve as a condensate container, and which between the inlet (2) and the outlet (3) has a screen (5, 50) in the part of the chamber in which condensate (4) can be collected, which is so arranged that in operation a of steam flow through the flow monitor caused pressure drop at the outlet of the chamber increases the level of condensate accumulated in the chamber on the outlet side of the screen with a corresponding decrease of the condensate level on the inlet side of the screen, the flow monitor indicating change in condensate of a pressure drop generated by an angular current at the outlet, has means (6, 7), comprising an electrode (6) extending into the interior of said part of the chamber, in which condensate can collect, which electrode (6) is electrically isolated from an electrically conductive portion (9), which is arranged so that when changing the condensate level to a predetermined extent, caused by a pressure drop at the outlet of the flow monitor (3), an electrical circuit between the electrode via condensate to the electrically conductive portion (7), in order to provide an electrical indication for monitoring the flow of steam through the steam line, whereby the outlet (3) of the flow guard is connected to the inlet of said steam trap, so that a steam current to the steam trap passes through the flow guard and loss of steam at the steam trap causes a pressure drop at the outlet (3) of the flow monitor condensate chamber (1), which is sufficient to effect a change in condensate level in the flow monitor to a predetermined level, at which the flow monitor indicates a steam flow of certain size through the flow monitor.