GB2123783A

GB2123783A - Feeding pressure medium into a conveying pipeline

Info

Publication number: GB2123783A
Application number: GB08221015A
Authority: GB
Inventors: Hermann Josef Linder
Original assignee: Individual
Current assignee: Individual
Priority date: 1982-07-21
Filing date: 1982-07-21
Publication date: 1984-02-08
Also published as: GB2123783B

Abstract

Apparatus for feeding a fluid pressure medium into a pipeline 3 for conveying solids and comprising an annular pressure chamber 4 formed by a casing surrounding said pipeline and provided with means 5, 6 for connection to a fluid pressure medium, the wall of the said pipeline being perforated in the region of said casing to allow communication between the interior of the pipeline and the pressure chamber, a filter 8 made from resilient material located between the pressure chamber and the pipeline, and mean 11 located in the pressure chamber for pressing the filter against the wall of the pipeline. <IMAGE>

Description

SPECIFICATiON Apparatus for feeding a pressure medium into a pipeline This invention relates to apparatus for feeding a fluid pressure medium, for example a pneumatic or hydraulic pressure medium, into a pipeline conveying solids.

German Patent Application DAS 2116 972 discloses an apparatus of this kind which comprises a casing having two half circular shells surrounding the pipeline, and which forms an annular pressure chamber, which is connected to a pipeline carrying the pressure medium. In the vicinity of the casing the pipeline has openings and between the pressure chamber and the pipeline a sieve netting is provided which is held on the pipeline by means of adhesive tapes. The sieve is intended to prevent the conveyed material from passing out of the pipeline into the annular pressure chamber. If this material entered the pressure chamber, it would mix with the pressure medium and lead to blockages of fittings and regulating devices. In addition, inadmissible deposits could be formed outside the pipe system.

This must in particular be avoided if the solids are foods or chemical products.

As a result of this construction, there is often a higher pressure in the pipeline than that of the pressure medium. The solids conveyed in the pipeline attempt to pass through the holes into the pressure chamber. The known apparatus with the sieve netting placed around the pipe and which is fixed by adhesive tapes, cannot prevent this escape, particularly in the case of very fine solids.

On the one hand this escape results from the use of a sieve netting and on the other the netting and its fixing means are unable to withstand the high pressure differences if a high pressure builds up within the pipeline.

The problem of the invention is therefore to so construct the apparatus that it is reliably possible to prevent any escape of solids from the pipeline into the pressure chamber.

According to the present invention apparatus for feeding a fluid pressure medium into a pipeline for conveying solids comprises an annular pressure chamber formed by a casing surrounding said pipeline and provided with means for connection to a fluid pressure medium, the wall of said pipeline being perforated in the region of said casing to allow communication between the interior of the pipeline and the pressure chamber, a filter made from resilient material located between the pressure chamber and the pipeline, and means located in the pressure chamber for pressing the filter against the wall of the pipeline.

In place of the sieve of the previous construction a filter made from a resilient material is used, and this can be of the kind used for separating solids from gas or liquids. The maximum pore size of the filter material will be determined by the minimum particle size of the solid conveyed.

Preferably the means for pressing the filter against the wall of the pipeline include projections on the casing which extend through the pressure chamber. The projections press the resilient filter against the pipeline in such a way that it cannot be raised from it at any point if there is a high pressure difference between the interior of the pipeline and the pressure chamber.

The invention can be performed in many ways but one embodiment will now be described by way of example and with reference to the accompanying drawings in which: Figure 1 is a side view with longitudinal section of the apparatus partly in cross-section; and Figure 2 is an end view with cross-section along line A in Figure 1.

As shown in the drawings the casing comprises two half cy!indrical shells 1, 2, which are constructed symmetrically to one another. The two half shells surround a pipeline 3 and provide an annular fluid pressure chamber 4. Pressure pipelines 5, 6 carrying the fluid pressure medium issue into the annular pressure chamber 4 The fluid pressure medium can be gas, air, steam or liquids.

The pressure chamber 4 of each circular halfshell 1, 2 is ciosed towards pipeline 3 by a perforated plate 7 shaped like a circular half-shell.

Between plate 7 of each casing half-shell 1, 2 is provided a filter made of a resilient material 8, which covers openings 9 in pipelines 3 in the vicinity of half-shells 1, 2. The filter can be made of various kinds of material for example asbestos, and is cylindrical to allow it to be slid into place.

Pressure chamber 4 is formed by a plurality of annular spaces 10. Between annular spaces 10 circular webs 11 are provided ensuring that the perforated plate 7 and consequently the filter 8 is pressed firmly against the wall of the pipeline 3 and slightly compressed.

To permit communication between annular spaces 10, webs 11 are interrupted by axially directed slots 1 2 thus forming projections 13, provided by the parts of the webs 11 extending through the pressure chamber 4 and which press the filter 8 against pipeline 3. This prevents the filter 8 from being raised from the wall of the pipeline 3. In order to show the projection 13 more clearly, the perforated plates 7, filter 8 and pipeline 3 are not shown in Figure 2.

The half-shell-shaped perforated plates 7 can be joined to the particular half-shell 1, 2 of the casing by screws 1 4. The casing ends have packing rings 1 5 preventing the escape of the pressure medium from pressure chamber 4.

As the pipeline 3 is weakened in the vicinity of openings 9, it is advantageous for the half-shells 1, 2 to be constructed in such a way that they are able to transfer the axial forces.

For this purpose sawtooth-shaped projections are provided on the casing half-shells 1, 2 on either side of chamber 4 and these projections embrace the wall of the pipeline 3. They are of particular importance if the pipeline 3 is made from a material with a limited elasticity.

In order that the casing half-shells can be interconnected in a liquid-tight and gas-tight manner the packing surfaces 1 7 of connecting flanges 1 8 provided on the shells have recesses 19, which ensure that contact pressure in connection with surfaces 1 7 is increased. The packing surfaces 1 7 are provided with a liquid or pasty sealing agent.

Claims

CLAIMS:

1. Apparatus for feeding a fluid pressure medium into a pipeline for conveying solids and comprising an annular pressure chamber formed by a casing surrounding said pipeline and provided with means for connection to a fluid pressure medium, the wall of said pipeline being perforated in the region of said casing to allow communication between the interior of the pipeline and the pressure chamber, a filter made from resilient material located between the pressure chamber and the pipeline, and means located in the pressure chamber for pressing the filter against the wall of the pipeline.

2. Apparatus as claimed in claim 1 in which the means for pressing the filter against the wall of the pipeline include projections on the casing which extend through the pressure chamber.

3. Apparatus as claimed in claim 2 in which a perforated plate is located between the projections and the filter.

4. Apparatus as claimed in claim 3 in which the perforated plate is connected to the casing.

5. Apparatus as claimed in any one of claims 1 to 4 in which the casing is formed as two or more part circular shells.

6. Apparatus as claimed in claim 5 when dependent on claim 4 in which the perforated plate is formed as two or more part circular members which are connected to the part circular shells of the casing.

7. Apparatus as claimed in any one of preceeding claims 1 to 6 in which the pressure chamber comprises a number of interconnected annular spaces, webs between the spaces forming projections which act as means for pressing the filter against the wall of the pipeline.

8. Apparatus as claimed in claim 7 in which said webs are interrupted by slots.

9. Apparatus as claimed in any one of preceeding claims 1 to 8 in which the casing on each side of the pressure chamber is provided with annular projections which engage the wall of the pipeline.

10. Apparatus as claimed in claim 9 in which the annular projections have a saw-tooth profile.

11. Apparatus as claimed in any one of the preceeding claims 5 to 10 in which each of the part circular shells has connection flanges for connection to the adjacent shell, the engagement surfaces of said flanges being provided with recesses.

12. Apparatus for feeding fluid pressure into a pipeline substantially as described herein with reference to and as shown in the accompanying drawings.