GB2292104A

GB2292104A - Retractable Injector Carrier Assembly

Info

Publication number: GB2292104A
Application number: GB9413736A
Authority: GB
Inventors: Paul David Hargreaves; James Wallace Boyd
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-07-07
Filing date: 1994-07-07
Publication date: 1996-02-14
Also published as: GB9413736D0

Abstract

Chemical dosing injectors are used extensively to inject liquid or gaseous mediums into process streams and treatment applications in chemical manufacturing processes, e.g. water treatment plants for potable water, swimming pools, process streams involving chlorination, bromination, ozone injection or general chemical injection. Current injection methods are prone to the build up of deposits at the injector outlet and within the injector body assembly. The injector assembly incorporates a unique bluff body shape (1) which causes vortices to be generated at the interface with process medium thus greatly increasing mixing in the injection zone (2). Chemicals are injected via four slots close to the vortex shedder (3). The injection spindle can be cleaned without the need to shut the process down. An indicator line (7) on the inner spindle appears when fully retracted and closed off, thus allowing rodding or brushing to be carried out on the internal structure of the inner injection spindle (5). <IMAGE>

Description

This invention relates to a retractable injector assembly to carry injectors, to assist in chemical and gaseous dosing and mixing.

Description The assembly consists of three main parts, the main outer body (8); the inner injection spindle (5); the bluff body assembly (1), which fits in the ehd of (5). The injection spindle rotates within (8) and by virtue of the large acme screw thread moves over a large range, in and out of (8) thus allowing the openings in (5) to be moved in and out of the process with ease and without moving the main body (8).

The injectant is injected via four slots (3). When (5) is withdrawn from the process it is sealed off from process pressure by means of a double 10 ring (6) seal on the shaft of (5).

The irljec.cn spindle (5) is r.a.c. with the aid of a special tool (4j which fits in slots t n indicator line (7j appears when the probe is fully retracted. Screwing it back clockwise extendsthe injector back into the process stream. All threads with the exception of the acme screw thread, are normal BSP or metric to suit.

Claims

1. An injector assembly comprising an outer body or housing and at least one inner injector body arranged so that the inner injector body may be at least partially retracted into the outer body, wherein in the retracted condition injector openings in the inner body or injector are at least partially occluded by the outer body or housing.

2. An injector assembly as claimed in Claim 1 wherein the inner body includes a formation for generating vortices which enhances mixing in the region of the injection openings.

3. An injector assembly as claimed in claims 1 or 2 wherein the vortex generator is a separable element mounted on the inner body so as to deflect fluid flow internally of the inner element.

4. An injector assembly as claimed in Claim 2 wherein the formation comprises a truncated pyramidal projection of rectangular cross section.

5. An injector assembly as claimed in any of claims 1 to 4 wherein the inner body is continuously adjustable within the outer body so as to vary or modify the injection flow.

6. An injector assembly as claimed in Claim 5 wherein the continuous adjustment is provided by a screw thread interengagement between the inner and outer bodies.

7. An injector assembly as claimed in any of Claims 1 to 6 wherein the inner body is retractable into the outer body so as to seal off the injector openings within the outer body.

8. An injector assembly as claimed in Claim 7 wherein the inner injector body in the region of the injector openings is made available for cleaning by being positionable in a fully retractable condition.

9. An injector assembly as claimed in Claims 7 or 8 wherein a visible sign is revealed on full retraction of the inner body within the outer body.

10. An injector assembly as claimed in Claim 9 wherein the visible sign is an indicator line on the main body.

11. A method of cleaning an injector assembly comprising retracting an inner injector body into an outer body so as to seal off at least one injector opening and carrying out a cleaning operation in the said at least one injector opening.

12. A method of cleaning an injector assembly as claimed in Claim 11 wherein the inner body is retracted into the outer body until a visible indication is revealed.

13. A method of cleaning an injector assembly as claimed in Claims 11 or 12 wherein a tool or key is used to rotate the inner body with respect to the outer body in order to retract it therein.

14. A method of cleaning an injector assembly as claimed in any of Claims 11 to 13 wherein the cleaning operation comprises rodding or brushing.

15. An injector assembly substantially as hereinbefore described and as illustrated in Figures 1 to 3.

16. A method of cleaning an injector assembly substantially as hereinbefore described and as illustrated in Figures 1 to 4.