GB2119074A

GB2119074A - Heat exchanger

Info

Publication number: GB2119074A
Application number: GB08301911A
Authority: GB
Inventors: Alfons Wolfseder
Original assignee: Anton Steinecker Maschinenfabrik GmbH
Current assignee: Anton Steinecker Maschinenfabrik GmbH
Priority date: 1982-04-16
Filing date: 1983-01-24
Publication date: 1983-11-09
Also published as: DE8210810U1; JPS58187789A; GB8301911D0

Abstract

The invention relates to a heat exchanger with at least two coaxially arranged helical pipes 9, 10, 11, 12 in which a cylindrical displacement body 15 is arranged in the chamber enclosed by the innermost helical pipe 12 and the interior of the said displacement body is connected to the chamber containing the helical pipes. Such a heat exchanger is distinguished by a particularly simple construction with a good degree of efficiency. <IMAGE>

Description

SPECIFICATION Heat exchanger The invention relates to a heat exchanger, especially for boiling mash or wort, with a vertical housing which contains an inlet connection for a pressurised heating medium in the upper region and an outlet connection for the heating medium in the lower region, at least two helical pipes being arranged coaxially with each other in the housing with their lower ends connected to an inlet connection and their upper ends connected to an outlet connection for the medium to be heated.

A heat exchanger of the aforesaid type is the subject matter of Utility Model No. G 80 31 264.7 in the name of the present applicants. It is distinguished by good pyrometric efficiency and particularly simple maintenance.

The object of the invention is to make further improvements in the efficiency of the known heat exchanger whilst at the same time simplifying its construction.

This object is achieved according to the invention in that a cylindrical displacement body is arranged in the space enclosed by the innermost helical pipe, the interior of the said displacement body being connected to the chamber containing the helical pipes.

The flow chamber for the heating medium (preferably steam) is reduced in size by this displacement body so that the heating medium flows along the helical pipes containing the medium to be heated at a greater speed. In this way the heat exchange is further improved.

Since in the construction according to the invention the interior of the cylindrical displacement body is connected to the chamber through which the heating medium flows and which is contained by the helical pipes, there is an equalisation of pressure between these two chambers. This is of considerable importance especially when the heating medium is delivered at increased pressure. In this case the cylindrical displacement body does not have to be resistant to compression because of the equalisation of pressure, and this makes a much lighter, more economical construction possible.

Advantageous constructions of the invention are the subject matter of the subordinate claims and are explained in greater detaii in connection with the description of an embodimentwhich is illustrated in the drawing.

In the single drawing which has been kept to some extent schematic the heat exchanger 1 according to the invention is shown in a vertical sectional view.

This heat exchanger 1 is used above all for boiling mash or wort in beer production and has a vertical (outer) housing 2, which contains a substantially cylindrical peripheral wall 3, an upwardly curved cover 4, a downwardly curved base 5 and an inlet connection 6 for pressurised heating medium in the lower region and an outlet connection 7 for this heating medium in the upper region. In the illustrated embodiment the said inlet connection 6 is preferably arranged at the upper end of the housing centrally on the cover 4 and the outlet connection 7 is preferably arranged centrally on the base 5 at the lower end of the housing. This housing 2 is constructed so as to be resistant to compression and can also have a closable access opening 8 which is also resistant to compression in the region of the upper end of the peripheral wall 3.

In order to enable the medium to be heated, that is to say in this case mash or wort, to be heated in the housing 2 by indirect heat exchange and be brought to boiling, at least two helical pipes are arranged coaxially with each other inside the housing 2. The number of helical pipes is generally dependent upon the size and capacity of the heat exchanger 1. In the illustrated embodiment four helical pipes 9, 10, 11 and 12 are arranged coaxially in each other and aligned axially to the axis 2a of the container, that is to say these helical pipes 9 to 12 constitute a cylindrical structure.The lower end of each of these helical pipes9to 12 has an inlet connection for the medium to be heated (mash orwort) whilst each upper end has an outlet connection forthis medium; these inlet and outlet connections of the four helical pipes 9 to 12 are preferably combined - as is known perse - into manifolds, so that a common inlet manifold 13 is provided at the lower end of the helical pipes 9 to 12 and a common outlet manifold 14 is provided at the upper end for all the pipes 9 to 12.

A cylindrical displacement body 15 is arranged in the chamber enclosed by the innermost helical pipe 12 inside the housing 2. This displacement body has a substantially domed construction and is open at its lower end 15a in such a way that its inner chamber 16 is connected to the outer container chamber 17 containing the helical pipes 9 to 12. This displacement body 15 is aligned coaxially inside the innermost helical pipe 12 and thus also coaxially with the container 2. Over its height this displacement body 15 is constructed in the form of a tube and it has an upwardly curved cover part 18 at its upper end; by contrast the lower end 15a is completely open.

Because of this arrangement inside the container 2 the lower open end of the displacement body 15 axially aligned - is located immediately above the outlet connection 7 for the heating medium which is provided centrally in the housing base 5.

In the region of this lower end 15a the displacement body 15 is constructed in such a way that there is an open connection between the aforesaid outer container chamber 17 on the one hand and the inner chamber 16 of the displacement body and the heating medium outlet connection 7 on the other hand. For this purpose the open lower end 15a of the cylindrical displacement body 15 is constructed in the region of the lower end 15a' with a plurality of cutouts 19 arranged over the periphery of the body, whilst the remaining part of this lower edge 15a' is supported directly on the downwardly curved base of the housing 2.The open connection thus formed on the one hand permits intake of the heating medium from the outer container chamber 17 (which contains the helical pipes 9 to 12) into the outlet connection 7 and on the other hand a desired equalisation of pressure between this outer container chamber 17 and the inner chamber 16 of the displacement body 15 so that the latter can be produced in a relatively light construction.

As regards the fixing of the helical pipes 9 to 12 in the outer - annular - container chamber 17 it should be mentioned that a plurality of vertical carriers can be distributed over the periphery of the container and supported on the container base 5, and over the height of these vertical carriers at specific distances a plurality of approximately horizontally extending brackets in each case support a plurality of windings arranged one above the other of the relevant pipes without any firm connection being made to the peripheral wall 3 of the container on the one hand and to the cylindrical displacement body 15 on the other hand, so that a free expansion mobility is maintained between these parts.

A delivery arrangement for cleansing fluid can also be provided in the upper part 17a of the outer container chamber 17 above the helical pipes9to 12.

In this embodiment it should be assumed that - as indicated by dash-dot lines - an annular spray line 20 for cleansing fluid is provided and has an outer pipe connection 21. Cleansing fluid can be introduced into the container 2 via this spray line 20 in case of need and sprayed over the helical pipes 9 to 12; the cleansing fluid can then be extracted via a separate discharge pipe (not shown) or optionally through the outlet connection 7.

For mounting of the heat exchanger 1 it can also be advantageous to provide a plurality of mounting supports 22 (only one is shown in detail) distributed over the container base 5, and these supports can be provided at their lower end with a foot 23 which can be adjusted in height.

Claims

1. Heat exchanger, especially for boiling mash or wort, with a vertical housing which contains an inlet connection for a pressurised heating medium in the upper region and an outlet connection for the heating medium in the lower region, at least two helical pipes being arranged coaxially with each other in the housing with their lower ends connected to an inlet connection and their upper ends connected to an outlet connection for the medium to be heated, characterised in that a cylindrical displacement body (15) is arranged in the space enclosed by the innermost helical pipe (12), the interior (16) of the said displacement body being connected to the chamber (17) containing the helical pipes (9 to 12).

2. Heat exchanger as claimed in claim 1, characterised in that the displacement body (15) is of domed construction and is open at its lower end (15a).

3. Heat exchanger as claimed in claim 1, characterised in that the discharge connection (7) for the heating medium is arranged centrally on the base (5) of the housing (2) below the displacement body (1 5).

4. Heat exchanger as claimed in claims 1 to 3, characterised in that the displacement body (15) is constructed in its lower region in such a way that there is an open connection (19) between the chamber (17) containing the helical pipes (9to 12) on the one hand and the inner chamber (16) of the displacement body (15) and the discharge connection (7) for the heating medium on the other hand.

5. Heat exchanger as claimed in claim 4, characterised in that the cylindrical displacement body (15) is constructed over its height in the form of a pipe and has an upwardly curved cover part (18) at the upper end whilst its lower end (15a) is completely open.

6. Heat exchanger as claimed in claims 4 and 5, characterised in that the lower end (15a) of the cylindrical displacement body (15) is supported with its lower edge (15a') on the downwardly curved base (7) of the housing (2) and in the region of this lower end has cutouts (19) which form the open connection of the chamber (17) containing the helical pipes (9 to 12) to the inner chamber (16) of the displacement body and the discharge connection (7) for the heating medium.

7. Heat exchanger substantially as herein described and with reference to the accompanying drawings.