GB2078302A - An induction nozzle - Google Patents

Abstract

An induction nozzle includes a primary fluid pipe (10) having an inlet end (11), a discharge end (12) and one or more apertures (13) in its wall. A secondary fluid pipe (14) extends in the primary fluid pipe from the or each aperture (13) at least towards and preferably beyond the discharge end of the primary fluid pipe. The or each secondary fluid pipe converges on a longitudinal centre line of the primary fluid pipe. <IMAGE>

Description

SPECIFICATION An induction nozzle This invention relates to an induction nozzle.

According to the present invention there is provided an induction nozzle comprising a primary fluid pipe having a discharge end and one or more apertures in its wall, and a secondary fluid pipe extending in the primary fluid pipe from the or each aperture at least towards the discharge end of the primary fluid pipe and converging on a longitudinal centre line of the primary fluid pipe.

Preferably the nozzle has a plurality of peripherally spaced apertures in its wall and a corresponding number of secondary fluid pipes extending in the primary fluid pipe from a respective aperture at least towards the discharge end of the primary fluid pipe and converging on the longitudinal centre line of the primary fluid pipe.

Preferably, the primary fluid pipe is a body of revolution, e.g. right cylindrical, and in this case, where a plurality of apertures are provided, they may be equi-angularly spaced.

Preferably, the or each secondary fluid pipe is right cylindrical.

Advantageously, the or each secondary fluid pipe extends beyond the discharge end of the primary fluid pipe.

The invention will now be more particularly described, by way of example, with reference to the accompanying drawings, wherein: Figure l is a perspective view of one embodiment of an induction nozzle according to the invention; and Figure 2 is a side view of the nozzle of Figure 1.

Referring to the drawings, the nozzle shown therein comprises a primary fluid pipe 10 having a fluid inlet end 11, a fluid discharge end 12 and right cylindrical inner and outer wall surfaces. A plurality of apertures 13 (as shown four) are provided in the pipe 10. The apertures 13 are equi-angularly spaced and equi-distantly spaced from the discharge end 12.

The apertures 13 are elliptical.

A plurality of secondary fluid pipes 14, equal in numbertothe number of apertures 13, are also provided. Each pipe 14 has right cylindrical inner and outer wall surfaces and extends in the pipe 10 from a respective aperture towards the discharge end 12 of the pipe 10. The pipes 14 converge on the longitudinal axis of the pipe 10 and as shown, extend beyond the discharge end 12 of the pipe 10. Thus, the radially outermost portions of the pipes 14 lie on a frustro-cone.

In use, the nozzle may be used in a hot air heating system for industrial premises, in which case primary hot air is fed, at say 5000 ft/min and 200 C, through the primary pipe 10. The flow of hot air from the discharge end 12 induces a flow of surrounding secondary warm air through the secondary pipes 14.

This secondary air is mixed with primary air at and beyond the discharge ends of the secondary pipes 14.

In the arrangement shown it is believed that it may be possible to achieve an induction ratio of 11/2 to 1.

It is not thought to be necessary for the secondary pipes 14 to project beyond the discharge end 12 of the pipe 10 as shown, although by so doing a greater induction ratio may be achieved due to further entrainment of secondary air caused by the low pressure zone surrounding the projecting portions of the pipes 14. It is, however, thought to be necessary for the pipes 14to converge on the longitudinal axis of the pipe 10.

The pipe 10 could be of different shape e.g.

frustro-conical and any number (including one) of pipes 14 could be provided.

Moreover, the nozzle could be associated with a control valve as described in our copending British Application No.8017066 (M & Folio 230P40066).

Other uses of the nozzle may include the mixing of liquids.

1. An induction nozzle comprising a primaryfluid pipe having a discharge end and one or more apertures in its wall, and a secondary fluid pipe extending in the primary fluid pipe from the or each aperture at least towards the discharge end of the primary fluid pipe and converging on a longitudinal centre line of the primary fluid pipe.

2. An induction nozzle as claimed in claim 1, having a plurality of peripherally spaced apertures in its wall and a corresponding number of secondary fluid pipes extending in the primary fluid pipe from a respective aperture at least towards the discharge end of the primary fluid pipe and converging on the longitudinal centre line of the primary fluid pipe.

3. An induction nozzle as claimed in claim 1 or claim 2, wherein the primary fluid pipe is a body of revolution.

4. An induction nozzle as claimed in claim 3, wherein the primary fluid pipe is right cylindrical.

5. An induction nozzle as claimed in claim 3 or claim 4 when dependent on claim 2, wherein the apertures are equi-angularly spaced.

6. An induction nozzle as claimed in any one of the preceding claims, wherein the or each secondary fluid pipe is right cylindrical.

7. An induction nozzle as claimed in any one of the preceding claims, wherein the or each secondary fluid pipe extends beyond the discharge end of the primary fluid pipe.

8. An induction nozzle substantially as hereinbefore described with reference to and as shown in the accompanying drawings.

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

Claims (8)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION An induction nozzle This invention relates to an induction nozzle. According to the present invention there is provided an induction nozzle comprising a primary fluid pipe having a discharge end and one or more apertures in its wall, and a secondary fluid pipe extending in the primary fluid pipe from the or each aperture at least towards the discharge end of the primary fluid pipe and converging on a longitudinal centre line of the primary fluid pipe. Preferably the nozzle has a plurality of peripherally spaced apertures in its wall and a corresponding number of secondary fluid pipes extending in the primary fluid pipe from a respective aperture at least towards the discharge end of the primary fluid pipe and converging on the longitudinal centre line of the primary fluid pipe. Preferably, the primary fluid pipe is a body of revolution, e.g. right cylindrical, and in this case, where a plurality of apertures are provided, they may be equi-angularly spaced. Preferably, the or each secondary fluid pipe is right cylindrical. Advantageously, the or each secondary fluid pipe extends beyond the discharge end of the primary fluid pipe. The invention will now be more particularly described, by way of example, with reference to the accompanying drawings, wherein: Figure l is a perspective view of one embodiment of an induction nozzle according to the invention; and Figure 2 is a side view of the nozzle of Figure 1. Referring to the drawings, the nozzle shown therein comprises a primary fluid pipe 10 having a fluid inlet end 11, a fluid discharge end 12 and right cylindrical inner and outer wall surfaces. A plurality of apertures 13 (as shown four) are provided in the pipe 10. The apertures 13 are equi-angularly spaced and equi-distantly spaced from the discharge end 12. The apertures 13 are elliptical. A plurality of secondary fluid pipes 14, equal in numbertothe number of apertures 13, are also provided. Each pipe 14 has right cylindrical inner and outer wall surfaces and extends in the pipe 10 from a respective aperture towards the discharge end 12 of the pipe 10. The pipes 14 converge on the longitudinal axis of the pipe 10 and as shown, extend beyond the discharge end 12 of the pipe 10. Thus, the radially outermost portions of the pipes 14 lie on a frustro-cone. In use, the nozzle may be used in a hot air heating system for industrial premises, in which case primary hot air is fed, at say 5000 ft/min and 200 C, through the primary pipe 10. The flow of hot air from the discharge end 12 induces a flow of surrounding secondary warm air through the secondary pipes 14. This secondary air is mixed with primary air at and beyond the discharge ends of the secondary pipes 14. In the arrangement shown it is believed that it may be possible to achieve an induction ratio of 11/2 to 1. It is not thought to be necessary for the secondary pipes 14 to project beyond the discharge end 12 of the pipe 10 as shown, although by so doing a greater induction ratio may be achieved due to further entrainment of secondary air caused by the low pressure zone surrounding the projecting portions of the pipes 14. It is, however, thought to be necessary for the pipes 14to converge on the longitudinal axis of the pipe 10. The pipe 10 could be of different shape e.g. frustro-conical and any number (including one) of pipes 14 could be provided. Moreover, the nozzle could be associated with a control valve as described in our copending British Application No.8017066 (M & Folio 230P40066). Other uses of the nozzle may include the mixing of liquids. CLAIMS

1. An induction nozzle comprising a primaryfluid pipe having a discharge end and one or more apertures in its wall, and a secondary fluid pipe extending in the primary fluid pipe from the or each aperture at least towards the discharge end of the primary fluid pipe and converging on a longitudinal centre line of the primary fluid pipe.

2. An induction nozzle as claimed in claim 1, having a plurality of peripherally spaced apertures in its wall and a corresponding number of secondary fluid pipes extending in the primary fluid pipe from a respective aperture at least towards the discharge end of the primary fluid pipe and converging on the longitudinal centre line of the primary fluid pipe.

3. An induction nozzle as claimed in claim 1 or claim 2, wherein the primary fluid pipe is a body of revolution.

4. An induction nozzle as claimed in claim 3, wherein the primary fluid pipe is right cylindrical.

5. An induction nozzle as claimed in claim 3 or claim 4 when dependent on claim 2, wherein the apertures are equi-angularly spaced.

6. An induction nozzle as claimed in any one of the preceding claims, wherein the or each secondary fluid pipe is right cylindrical.

7. An induction nozzle as claimed in any one of the preceding claims, wherein the or each secondary fluid pipe extends beyond the discharge end of the primary fluid pipe.

8. An induction nozzle substantially as hereinbefore described with reference to and as shown in the accompanying drawings.