GB2090964A

GB2090964A - Ventilating Air Distributing Device

Info

Publication number: GB2090964A
Application number: GB8130952A
Authority: GB
Original assignee: H Krantz GmbH and Co
Current assignee: H Krantz GmbH and Co
Priority date: 1980-11-08
Filing date: 1981-10-14
Publication date: 1982-07-21
Also published as: GB2090964B; DE3042216C2; IT1142054B; AT373168B; ES274983U; CH653430A5; ES274983Y; NL183251B; ATA465881A; IT8124900A0; BE891027A; NL8104890A; FR2493917A1; NL183251C; FR2493917B1; DE3042216A1

Abstract

A ventilating air distributing device (e.g. for an air conditioning system) comprises core tube 4 openable and closable by valve disc 8, and surrounded by an outer tube 1 to define therebetween an annular space in which helical vanes 5 are disposed. The entry end of the core tube 4 is rounded at 7; the outlet end thereof has thereon a flange-like restrictor 6 projecting into the annular space. The outlet end of the outer tube 1 is rounded and flared as at 3 and connects with a collar 10 comprising successively a cylindrical part 11, a frusto-conical part 12 and an annular disc 13. When the disc 8 is closed, air passing through the annular space emerges as a swirling horizontal current; with the disc 8 partially open, air passing through the core tube 4 partially entrains the horizontal current to reduce its divergence; when the disc 8 is fully open, the current through the annular space is substantially wholly entrained, so as to emerge substantially axially with the current through the core tube 4. <IMAGE>

Description

SPECIFICATION Swirl Outlet This invention relates to a swirl outlet, that is to say an outlet (e.g. for an air conditioning installation) which causes medium passing therethrough to emerge with a whirling or eddying motion, comprising of an outer tube and a core tube arranged concentrically therein, with swirl vanes disposed radially in the annular space between the outside diameter of the core tube and the inside diameter of the outer tube, and a valve disc which is mounted outside the core tube and which can be introduced, at the inflow end thereof, into the core tube and the outside diameter of which corresponds to the inside diameter of the core tube, in which the core tube has, at its said inflow end, a rounding which reduces the tube cross-section in the direction of flow and, carries at its outflow end, a restrictor which projects into the free annular cross-section, whilst the outer tube has a rounding which enlarges the diameter of said outer tube towards its outflow end.

Such swirl outlets are known and make it possible for part of the air passing therefrom to emerge horizontally and a further part to emerge vertically. The ratio of the two currents can be varied by varying the position of the valve disc.

Finally, swirl outlets are also known in which, by displacing a baffle plate, the total outlet current can be varied steplessly between the horizontal and the vertical outlet directions.

The problem underlying the invention is so to improve a swirl outlet of the kind described at the introduction hereof that it is possible, if desired, to entrain the horizontally-emerging air current by the vertically-emerging current, and thereby deflect the horizontally-emerging air.

To solve this problem, the invention provides that, the rounding which enlarges the diameter of the outer tube towards the outflow end thereof merges into a concentric collar which comprises a cylindrical portion connected to the said rounding, a frusto-conical portion which is connected to the cylindrical portion and which widens in the flow direction, and an annular disc which is connected to the frusto-conical portion.

With the outlet design, in accordance with the invention, the result is achieved that the air jets, which would otherwise emerge horizontally, can be entrained by the vertically emerging injector jet through the core tube, and thus be deflected, the air volume in the injector jet being variable by changing the position of the valve disc. With this construction, also the entrainment effect of the vertically emerging injector jet and thus the direction of the entire air current changes. When the core tube is closed by the valve disc (i.e. the volume flow of the injector jet =0), the air jet emerging from the annular space emerges more or less normally relative to the outlet axis, away from the latter, into the room.By increasing the air flow which enters the room or space through the core tube, to serve as an entrainment jet, the overall air jet is more contracted and enters the room more steeply. As soon as specific air volume flow occurs in the injector jet, the overall air flow emerges almost concentrically of the jet axis and vertically downwards into the room.

It is advisable to provide for the adjustability of the valve disc in such a way that the injector jet can be regulated either in small steps or else, preferably, steplessly, the regulation being effected with suitable control means. If desired however, the arrangement may be such that a one-time adjustment of the valve disc can lead to the desired result. Regulation without the use of extraneous energy, for example with the aid of a thermostat, is also possible.

In accordance with a preferred embodiment of the swirl outlet in accordance with the invention, the aperture angle a of the frusto-conical portion is from 20 to 60 , the ratio of the height h of the cylindrical portion to the diameter D thereof is from 0 to 0.4, the ratio of the diameter d of the core tube to the diameter D is from 0.1 to 0.5, the ratio of the outside diameter d, of the restrictor to the inside diameter d of the core tube is from 1.5 to 3 and the ratio of the height h, of the annular disc 13 to the diameter D amounts to 20.01.

With specific values of a and h:D the result can be achieved that the radially emerging air jets arising without the injector jet do not spread out horizontally, but at an angle cg1 > . The greater a and the ratio h:D are selected, the greater is a1.

Thus one achieves the effect that in high rooms the supply air is not blown out horizontally, but more or less steeply directly downwards into the room.

With the swirl outlet in accordance with the invention, the air volume flow can be caused to emerge at any desired angle from the horizontal and the perpendicular direction, the variation being stepless. In operation with maximum cooling load and in the case of a low room, horizontal emergence, or a small emergence angle a1, is preferred. In operation with heating, and in high rooms, a steep emergence angle a, is striven after, so that the room can be scavenged intensively with air right down to the floor.

A preferred embodiment of the swirl outlet in accordance with the invention is shown as an exemplified embodiment in the accompanying drawings, in which: Fig. 1 shows the swirl outlet diagrammatically in vertical cross-section; and Fig. 2 to 4 illustrate the swirl outlet, to a smaller scale, with its valve disc in different positions.

The illustrated swirl outlet comprises an outer tube 1 across the upper region of which is secured a perforate sheet or plate 2. This outer tube 1 has, at its outflow end, a rounding 3 which enlarges the diameter of the tube thereto.

Arranged through the sheet or plate 2, concentrically in the outer tube 1, is a core tube 4 from the outer periphery of which project twisted blades or vanes 5 which extend radially across the annular space between the outer tube 1 and the core tube 4.

The core tube 4 is provided, at its outflow end with a flange-like restrictor 6 which projects into the annular space; the tube 4 further has, at its inflow end, a rounding 7 which reduces the diameter of the core tube 4 in the direction of flow.

Arranged in the inlet region of the core tube 4 is a valve disc 8 which can be moved by a servo motor 9, at the inflow-end, into and out of the core tube 4.

Connected concentrically, at the outflow end, to the rounding 3 of the outer tube 1 is a collar 10 which comprises successively a cylindrical portion 1 a frusto-conical portion 12 which is connected to the cylindrical portion and which widens in the direction of flow, and an annular disc 13 which is connected to the frusto-conical portion and which is directed perpendicularly to the tube axis.

As shown by Fig. 2, when the valve disc 8 is shutting off the core tube 4 and no injector jet current may pass through said tube 4, the air current emerging by way of the annular space around the tube 4 are deflected by an angle of about 900 to the central axis of the swirl outlet.

In the condition of the outlet shown in Fig. 3, the currents introduced into the room by way of the annular space emerge at an angle a; to the horizontal which is greater than 0, because the valve disc 8 is raised relative to Fig. 1 and makes possible the creation of an injector jet by the core tube, which jet entrains the currents emerging from the annular space and thus deflects the same in comparison with Fig. 2.

In the condition of Fig. 4, the entrainment effect of the injector jet passing through and emerging from the core tube 4 is, by virtue of the position of the valve disc 8, shifted further upwardly in comparison with Fig. 3, so intense that the overall air currents experience a bunching or consolidation and pass steeply downwards into the room, so that the angle a1 apporaches 900.

Claims

1. A swirl outlet comprising an outer tube and a core tube arranged concentrically therein, with swirl blades disposed radially in the annular space between the outside diameter of the core tube and the inside diameter of the outer tube, and a valve disc which is mounted outside the core tube and which can be introduced, at the inflow end thereof, into the core tube and the outside diameter of which corresponds to the inside diameter of the core tube, in which the core tube has, at its said inflow end, a rounding which reduces the tube cross-section in the direction of flow and, carries at its outflow end, a restrictor which projects into the free annular cross-section, whilst the outer tube has a rounding which enlarges the diameter of said outer tube towards its outflow end, characterised in that the rounding which enlarges the diameter of the outer tube towards the outflow end thereof merges into a concentric collar which comprises a cylindrical portion connected to the said rounding, a frustoconical portion which is connected to the cylindrical portion and which widens in the flow direction, and an annular disc which is connected to the frusto-conical portion.

2. A swirl outlet as claimed in claim 1, characterised in that the aperture angle (cur) of the frusto-conical portion is from 20 to 600, the ratio of the height (h) of the cylindrical portion to the diameter (D) thereof is from 0 to 0.4, the ratio of the inside diameter (d) of the core tube to the diameter (D) is from 0.1 to 0.5, the ratio of the outside diameter (d1) of the restrictor to the inside diameter (d) of the core tube is from 1.5 to 3 and the ratio of the height (h,) of the annular disc to the diameter (D) is > 0.01.

3. A swirl outlet substantially as hereinbefore described with reference to and as illustrated in the accompanying drawings.