SE441783B

SE441783B - HANDLES FOR AIR FLOW AT THE CONTACT BODY

Info

Publication number: SE441783B
Application number: SE8008976A
Authority: SE
Inventors: R Holmberg; I Josefsson
Original assignee: Flaekt Ab
Priority date: 1980-12-19
Filing date: 1980-12-19
Publication date: 1985-11-04
Also published as: EP0054720B1; FI72196B; DK561281A; ATE8531T1; NO152470C; DE3164911D1; DK157948C; DK157948B; EP0054720A1; SE8008976L; FI72196C; FI814049L; NO152470B; NO814352L

Abstract

1. Device on a contact body (1) for liquids and gases, preferably water and air, where the gas streams through the contact body with a substantially horizontal stream direction, and the liquid flows through the contact body with a substantially vertical stream direction, and the contact body (1) consists of at least two mutually contacting contact blocks (2) which form a connection plane (3) there between having a forward boundary line (7a) longitudinally of the front side of the contact body, where the gas stream enters the contact body, and a rear boundary line (7b) longitudinally of the rear side of the contact body where the gas stream leaves this, characterised in that downstream of the rear boundary line (7b) of the connection plane (3) and in the region between the front and rear boundary lines (7a, 7b) an obstruction (8) for the gas stream is arranged in order to reduce the gas speed longitudinally of the entire length (c) of the rear boundary line (7b).

Description

8008976-6 det undre blocket, varvid vattnet samtidigt förs något mot luftströmmen. 8008976-6 the lower block, at the same time the water is led slightly towards the air flow.

Emellertid har detta inte lett till tillfredsställande resultat, efter- som lufthastigheten fortfarande begränsas uppåt av risken för vatten- medryckning från skarvarna (ca 4m/s).However, this has not led to satisfactory results, as the air velocity is still limited upwards by the risk of water entrainment from the joints (approx. 4m / s).

Föreliggande uppfinning har till ändamål att erbjuda en anordning att minska risken för vattenmedryckning i en skarv mellan blocken i en kontaktkropp för vätska och gas så att högre lufthastígheter kan upp- nås genom kontaktkroppen. Detta ändamål realiseras genom en anordning enligt patentkravets 1 kännetecken. Ändamålsenliga utföringsformer framgår av de efterföljande underkraven. Uppfinningen bygger på in- sikten om att en vattendroppe, som släpper det övre blocket i skarven mellan det övre och det undre blocket, företrädesvis i närheten av skarvens nedströms eller bakre begränsningslinje, rycks med den i huvudsak horisontella luftströmmen genom kontaktkroppen så snart luft- hastigheten överskrider ett visst värde, storleksordningen 2 m/s och att ett effektivt sätt att förhindra vattenmedryckning från skarven vid högre lufthastigheter genom kontaktkroppen är att kraftigt redu- cera lufthastigheten i och omkring skarvens nedströms begränsnings- linje. Ett exempel på utföringsform av uppfinningen applicerat på en .kontaktkropp av känt slag skall nu närmare beskrivas i anslutning till bifogade ritningsfigurer, där fig 1 visar en perspektivbild av en kontaktkropp med ett flertal kontaktblock, fig 2 visar en perspektivbild av ett hinder enligt uppfinningen och omgivande del av ett övre och ett undre kontaktblock, fig 3 visar tvärsnitt av alternativa utföringsformer av hinder.The object of the present invention is to provide a device for reducing the risk of water entrainment in a joint between the blocks in a contact body for liquid and gas so that higher air velocities can be achieved through the contact body. This object is realized by a device according to the features of claim 1. Appropriate embodiments appear from the following subclaims. The invention is based on the insight that a drop of water, which releases the upper block in the joint between the upper and lower block, preferably in the vicinity of the downstream or rear boundary line of the joint, is displaced by the substantially horizontal air flow through the contact body as soon as the air velocity exceeds a certain value, of the order of 2 m / s and that an effective way to prevent water entrapment from the joint at higher air velocities through the contact body is to greatly reduce the air velocity in and around the joint downstream boundary line. An example of an embodiment of the invention applied to a contact body of known type will now be described in more detail in connection with the accompanying drawing figures, where Fig. 1 shows a perspective view of a contact body with a plurality of contact blocks, Fig. 2 shows a perspective view of an obstacle according to the invention and surrounding part of an upper and a lower contact block, Fig. 3 shows cross-sections of alternative embodiments of obstacles.

I figur 1 är kontaktkroppen 1 placerad i en luftström S och sammansatt av ett flertal på varandra stående kontaktblock 2, varvid skarvplan 3 bildas mellan blocken. Vattnet tillföres vid kontaktkroppens topp med hjälp av ett hålförsett rörsystem 4 och strömmar nedåt längs vertikalt ställda, veckade, mot varandra stödjande kontaktplattor 5, 6 enligt den brittiska patentskriften 1.532.170. Enligt uppfinningen är ett hinder 8 anordnat uppströms skarvplanets 3 bakre begränsningslinje 7b och nedströms dess främre begränsningslinje 7a. Genom hindret 8 skapas ett område med kraftigt reducerad lufthastighet i och omkring bakre begränsningslinjen 7b. ' ' 8008976-6 I figur 2 visas i detalj ett hinder anordnat mellan två kontaktblock 2, ett övre block 21 och ett undre block 22. Hindret 8 är utformat som plan platta och ör anbragt i spår 9 och 10 i kontaktblocken 21 respektive 22.In Figure 1, the contact body 1 is placed in an air stream S and is composed of a plurality of superimposed contact blocks 2, whereby splice plane 3 is formed between the blocks. The water is supplied at the top of the contact body by means of a perforated pipe system 4 and flows downwards along vertically placed, pleated, abutting contact plates 5, 6 according to British Patent Specification 1,532,170. According to the invention, an obstacle 8 is arranged upstream of the rear boundary line 7b of the splice plane 3 and downstream of its front boundary line 7a. The obstacle 8 creates an area with greatly reduced air velocity in and around the rear boundary line 7b. Figure 2 shows in detail an obstacle arranged between two contact blocks 2, an upper block 21 and a lower block 22. The obstacle 8 is designed as a flat plate and is arranged in grooves 9 and 10 in the contact blocks 21 and 22, respectively.

Vid tillämpning av uppfinningen i luftfuktare kan hindrets höjd a upp- gå till mellan 10 och 20 mm medan dess avstånd b till bakre begrünsnings- linjen 7b uppgår till O,2'a till 3-a, företrädesvis 0,5-a till a. Hind- ret 8 ör hürvid anordnat utefter hela blockets 21 resp 22 eller begräns- ningslinjens 7b längd. Med ett hinder enligt denna utföringsform med höjden a = 30 mm och avståndet b = 0,67 . a = 20 mm applicerad på den typ av kontaktkropp som beskrives i den brittiska patentskriften 1.532. 120, vars totala djup uppgår till omkring 200 mm, har prov visat att vattenmedryckning erhålles från skarvarna först vid lufthastigheter upp mot 6 m/s, vilket överstiger den hastighet vid vilken vattenmedryck- ning från kontaktblocken. Även om hindret hör har utformats som en vertikalt ställd platta år uppfinningen inte begränsad hörtill utan hindret kan utformas på många alternativa sött. Andra exempel på hin- der visas i fig 3, där i figur 3a visas ett utformning dör hindret 8 är anordnat med en lutning i luftströmmens riktning. Enligt figur b är hindret utformat med två skönklar 8a,b lutade mot luftströmmens S riktning och i figure är skünklarna lutade med luftströmmens riktning.When applying the invention in humidifiers, the height a of the obstacle a can amount to between 10 and 20 mm, while its distance b to the rear boundary line 7b amounts to 0.2'a to 3-a, preferably 0.5-a to a. The obstacle 8 is hereby arranged along the entire length of the block 21 and 22 or the boundary line 7b, respectively. With an obstacle according to this embodiment with the height a = 30 mm and the distance b = 0.67. a = 20 mm applied to the type of contact body described in British Patent Specification 1,532. 120, the total depth of which amounts to about 200 mm, samples have shown that water entrainment is obtained from the joints only at air speeds up to 6 m / s, which exceeds the speed at which water entrainment from the contact blocks. Although the obstacle hear has been designed as a vertically placed plate, the invention is not limited to the ear but the obstacle can be designed on many alternative sweeteners. Other examples of obstacles are shown in Fig. 3, where in Fig. 3a a design is shown where the obstacle 8 is arranged with a slope in the direction of the air flow. According to figure b, the obstacle is formed with two legs 8a, b inclined towards the direction of the air flow S and in figure the legs are inclined with the direction of the air flow.

Hindren kan utformas i form av plattor enligt ovan men också genom att luftkanalerna blockeras på annat sött. Detta kan exempelvis genomföras genom att deformera kontaktplattorna inom det område som är avsett att bilda hindret.The obstacles can be designed in the form of plates as above but also by blocking the air ducts on other sweeteners. This can be done, for example, by deforming the contact plates within the area intended to form the obstacle.

Claims

8008976-6 P A T E N T K R A V

Device at a contact body (1) for liquid and gas, preferably water and air, wherein the air passes the contact body with a substantially horizontal flow direction and the water passes the contact body with a substantially vertical flow direction and the contact body (1) consists of at least two superimposed contact blocks (2) forming an intermediate joint plane (3) having a front boundary line (7a) along the front of the contact body where the air flow enters the contact body and a rear boundary line (7b) along the back of the contact body where the air flow leaves the same, characterized in that an obstacle (8) for the air flow is arranged upstream of the rear boundary line (7b) of the splice plane (3) and within the area between the front and rear boundary line (7a, 7b) for the purpose of reducing the air velocity along the entire length of the rear boundary line (7b). (c).

Device according to claim 1, characterized in that the distance (b) of the obstacle (8) from the rear boundary line (7b) of the splice plane (3) amounts to between 20 and 300%, preferably 50-100% of the height of the obstacle (a) .

Device according to claims 1-2, characterized in that the height (a) of the obstacle (8) amounts to 10-50 mm.

Device according to claims 1-3, characterized in that the obstacle (8) is designed as a plate arranged in grooves (9, 10) in the respective contact blocks (2).

Device according to claims 1-4, characterized in that the plate is flat and vertically arranged in the contact blocks (2).

Device according to claims 1-3, characterized in that the obstacle (8) is designed as blockages of the air ducts of the contact body (1), which blockages are produced by deformation of the contact plates (5,6) of the contact body.