GB1600802A

GB1600802A - Means for atomising liquids or for mixing together gases

Info

Publication number: GB1600802A
Application number: GB20291/78A
Authority: GB
Original assignee: Kabisch H P
Current assignee: Kabisch H P
Priority date: 1977-05-17
Filing date: 1978-05-16
Publication date: 1981-10-21
Also published as: IT7823247A0; JPS5416030A; DE2722226A1; FR2391368A1; DE2722226C2; IT1095128B

Description

(54) MEANS FOR ATOMISING LIQUIDS OR FOR MIXING TOGETHER GASES (71) I, HERBERT P. KABISCH, a German citizen of Bahnstrasse 38, 5090 Leverkusen, West Germany, do hereby declare the invention, for which I pray that a patent may be granted to me, and the method by which it is to be performed, to be particularly described in and by the following statement:- This invention relates to means for atomising liquids, for example liquid fuels, or for mixing together gases, of the kind which comprises a venturi passage.

Equipment of this kind is employed, for example, in carburettors for internal combustion engines.

According to the invention there is provided means for atomising liquids or for mixing together gases, comprising a venturi passage for a main gas stream, the venturi being formed by two generally frusto-conical portions which meet at their narrow ends to form an edge, a ring of porous material substantially co-axial with the venturi passage and located immediately downstream of the edge formed at the junction of the frustoconical portions, means for supplying the liquid to be atomised or the gas to be mixed with the main gas stream, and also a further gas, to the ring of porous material, the ring being arranged such that the liquid to be atomised or the gas to be mixed with the main gas stream is supplied through the porous material into the venturi passage immediately downstream of the junction between the frusto-conical portions, and the venturi passage containing a co-axial streamlined body which is axially movable to control the main gas flow through the venturi passage at the junction of the frusto-conical portions.

The streamlined body produces a smooth gas flow through the venturi at all control settings, so that optimum mixing conditions are maintained.

The co-axial ring is preferably formed of sintered material and has a large number of minute pores, but these pores should be large enough to pass the medium to be supplied to the venturi via the ring.

Since the ring is co-axial with the venturi passage, the medium supplied to the venturi via the ring may enter the venturi from all sides equally. Because the ring is positioned immediately downstream of the edge formed at the junction of the frusto-conical portions, the medium enters the venturi at the point of greatest turbulence so that the degree of mixing between the medium and the main gas stream is at an optimum.

There may be two or more such rings of porous material for each supplying a respective liquid or gas to the main gas stream, each ring being isolated from the other ring or rings.

The radially inner surface of the or each ring of porous material is preferably flush with the adjacent surface of the venturi passage on the downstream side.

Preferably an annular space is formed around the or each ring of porous material for supplying the liquid to be atomised or the gas to be mixed with the main gas stream, together with the further gas, to the ring of porous material. The liquid to be atomised or the gas to be mixed with the main gas stream may be supplied to the annular space through a passage which enters substantially tangentially. The further gas may be supplied through that same tangential passage or through a further passage which also enters the annular space substantially tangentially.

The invention will now be further described, by way of example only, with reference to the accompanying diagrammatic drawings, in which Figure 1 is a longitudinal section through one embodiment of an apparatus according to the invention, and Figure 2 is a detail view of a modification of the apparatus of Figure 1, to a larger scale.

The apparatus shown in Figure 1 comprises a venturi pipe 1. The venturi is formed by a convergent entry part 2 having a portion of generally frusto-conical form, and a divergent outlet part 3, also of generally frustoconical form. These frusto-conical portions meet to form an edge 4 which constitutes the throat or choke of the venturi. Directly downstream of this throat 4 are two annular disc-like bodies 6 and 7 of micro-porous sintered material islolated from one another by an insulating layer 5.

The -outer surfaces of these two bodies are cylindrical and their inner surfaces are concentric, are in the form of a truncated cone diverging in the direction of flow, and are flush with the wall of the outlet passage 3.

The body 6 communicates with a pipe 8 and the body 7 communicates with a pipe 9.

These pipes 8 and 9 operate at above or below the prevailing pressure and serve to carry liquid and gaseous media which have previously been mixed, metered and/or atomised to a certain extent.

Inside the pipe 1 there is mounted an axially displaceable streamlined bullet-like control member 10. By means of this member 10 the cross-sectional area of the throat 4 of the venturi can be varied in a stepless manner to the appropriate size. By virtue of its streamlined shape and its central disposition in the pipe 1, the member 10 ensures that, at all settings, the main gas flow through the pipe 1 in the direction of the arrow X, generally, and in particular in the critical region of the throat 4, is undisturbed and is distributed symmetrically. These almost ideal flow conditions ensure that, in passing over the inner walls of the micro-porous bodies 6 and 7, the main gas flow mixes intimately with the media emerging therefrom in finely divided form, with a high degree of uniformity of distribution and carries on undisturbed into the outlet portion 3.

Annular spaces 11 and 12 are formed around the bodies 6 and 7 of micro-porous material and the pipes 8 and 9 for the medium to be atomised enter the annular spaces 11 and 12 respectively, substantially tangentially. Some of the gas of the main stream, or another gas, may be added to the medium to be atomised, by means of a further feed pipe (not shown) for this added gas, opening likewise tangentially into the annular spaces.

In the modified version shown in Figure 2, an annular space 14 surrounding a body 13 of micro-porous material (which replaces the bodies 6 and 7) has a concave outer wall 15, at the maximum diameter of which are formed fine passages 16 leading into a further annular space 17 outside the wall 15.

These passages serve to carry away solid particles which may be present in the medium entering the first annular space 14 and which are flung by centrifugal force to the maximum diameter portion of the wall 15 and thence into the passages 16.

WHAT I CLAIM IS: 1. Means for atomising liquids or for mixing together gases, comprising a venturi passage for a main gas stream, the venturi being formed by two generally frusto-conical portions which meet at their narrow ends to form an edge, a ring of porous material substantially co-axial with the venturi passage and located immediately downstream of the edge formed at the junction of the frustoconical portions, means for supplying the liquid to be atomised or the gas to be mixed with the main gas stream, and also a further gas, to the ring of porous material, the ring being arranged such that the liquid to be atomised or the gas to be mixed with the main gas stream is supplied through the porous material into the venturi passage immediately downstream of the junction between the frusto-conical portions, and the venturi passage containing a co-axial streamlined body which is axially movable to control the main gas flow through the venturi passage at the junction of the frusto-conical portions.

2. Means according to Claim 1, in which the co-axial ring is formed of sintered material.

3. Means according to Claim 1 or 2, in which there are two or more rings of porous material for each supplying a respective liquid or gas to the main gas stream, each ring being isolated from the other ring or rings.

4. Means according to any preceding claim, in which the radially inner surface of the or each ring of porous material is flush with the adjacent surface of the venturi passage on the downstream side.

5. Means according to any preceding claim, in which an annular space is formed around the or each ring of porous material for supplying the liquid to be atomised or the gas to be mixed with the main gas stream, together with the further gas, to the ring of porous material.

6. Means according to Claim 5, including a passage which enters the or each annular space substantially tangentially for supplying thereto the liquid to be atomised or the gas to be mixed with the main gas stream, together with the further gas.

7. Means according to Claim 5, including a passage which enters the or each annular space substantially tangentially for supplying thereto the liquid to be atomised or the gas to be mixed with the main gas stream, and also including a further passage which enters the or each annular space substantially tangentially for supplying thereto the further gas.

8. Means for atomising liquids or for mixing together gases, which is substantially

**WARNING** end of DESC field may overlap start of CLMS **.

Claims

**WARNING** start of CLMS field may overlap end of DESC **. by a convergent entry part 2 having a portion of generally frusto-conical form, and a divergent outlet part 3, also of generally frustoconical form. These frusto-conical portions meet to form an edge 4 which constitutes the throat or choke of the venturi. Directly downstream of this throat 4 are two annular disc-like bodies 6 and 7 of micro-porous sintered material islolated from one another by an insulating layer 5. The -outer surfaces of these two bodies are cylindrical and their inner surfaces are concentric, are in the form of a truncated cone diverging in the direction of flow, and are flush with the wall of the outlet passage 3. The body 6 communicates with a pipe 8 and the body 7 communicates with a pipe 9. These pipes 8 and 9 operate at above or below the prevailing pressure and serve to carry liquid and gaseous media which have previously been mixed, metered and/or atomised to a certain extent. Inside the pipe 1 there is mounted an axially displaceable streamlined bullet-like control member 10. By means of this member 10 the cross-sectional area of the throat 4 of the venturi can be varied in a stepless manner to the appropriate size. By virtue of its streamlined shape and its central disposition in the pipe 1, the member 10 ensures that, at all settings, the main gas flow through the pipe 1 in the direction of the arrow X, generally, and in particular in the critical region of the throat 4, is undisturbed and is distributed symmetrically. These almost ideal flow conditions ensure that, in passing over the inner walls of the micro-porous bodies 6 and 7, the main gas flow mixes intimately with the media emerging therefrom in finely divided form, with a high degree of uniformity of distribution and carries on undisturbed into the outlet portion 3. Annular spaces 11 and 12 are formed around the bodies 6 and 7 of micro-porous material and the pipes 8 and 9 for the medium to be atomised enter the annular spaces 11 and 12 respectively, substantially tangentially. Some of the gas of the main stream, or another gas, may be added to the medium to be atomised, by means of a further feed pipe (not shown) for this added gas, opening likewise tangentially into the annular spaces. In the modified version shown in Figure 2, an annular space 14 surrounding a body 13 of micro-porous material (which replaces the bodies 6 and 7) has a concave outer wall 15, at the maximum diameter of which are formed fine passages 16 leading into a further annular space 17 outside the wall 15. These passages serve to carry away solid particles which may be present in the medium entering the first annular space 14 and which are flung by centrifugal force to the maximum diameter portion of the wall 15 and thence into the passages 16. WHAT I CLAIM IS:

1. Means for atomising liquids or for mixing together gases, comprising a venturi passage for a main gas stream, the venturi being formed by two generally frusto-conical portions which meet at their narrow ends to form an edge, a ring of porous material substantially co-axial with the venturi passage and located immediately downstream of the edge formed at the junction of the frustoconical portions, means for supplying the liquid to be atomised or the gas to be mixed with the main gas stream, and also a further gas, to the ring of porous material, the ring being arranged such that the liquid to be atomised or the gas to be mixed with the main gas stream is supplied through the porous material into the venturi passage immediately downstream of the junction between the frusto-conical portions, and the venturi passage containing a co-axial streamlined body which is axially movable to control the main gas flow through the venturi passage at the junction of the frusto-conical portions.

as described with reference to and as shown in Figure 1 of the accompanying drawings.

9. Means according to Claim 8, which is modified substantially as described with reference to and as shown in Figure 2 of the accompanying drawings.