EP1439354A1 - Heat exchanger - Google Patents

Abstract

The heat exchanger has a finned tube (2) in a casing (1). The tube has primary (3) and secondary (4) sectors aligned with horizontal (10) and vertical (12) center axes respectively. There is a gas burner (13) in the primary sector and a channel (15) in the secondary sector, formed by a central displacement body (18) and the casing.

Description

The invention relates to a heat exchanger according to the features in Preamble of claim 1.

Such a heat exchanger counts through the "Installation and operating instructions Energy Mini Nox "the Cooperative Inkoopvereniging" Coopra-Rotterdam " N.V., Haringvliet 72, NL-3011 TG Rotterdam, 10 / 98-1, p. 6 on the stand of the technique. It is used to provide hot water. This heat exchanger has a tube incorporated into a housing in a helical configuration individual cross ribs, the top of which is connected to a cold water supply and is connected with the lower end to a consumer for hot water. The coiled tube is identical over its entire height Diameter on. There is a cylindrical tube in the lower height area Integrated displacement body, on top of which is a gas burner followed. By the outer shape of the sinker and the inner The surface of the housing is a channel with a ring-shaped in the lower height range Cross section formed, to which a condensate drain in the form of a trough connected. The outlet nozzles of the gas burner are directed radially and are at a distance from the upper height range of the tube.

That receiving the pipe, the displacer and the gas burner The housing is integrated into a box with further regulating and control elements is attached to a wall, especially in the household.

In view of the fact that the box is usually comparatively high is hung, access to the gas burner is for maintenance and Repairs relatively complicated. It doesn't just have to cover the box opened, but usually the entire box removed from the wall to get to the gas burner from above. The hereby associated effort is therefore high.

Furthermore, it should be noted about the known design that the gas pressure ratios in the heat exchanger with regard to the gas burner Primary section in relation to that receiving the displacement body Secondary section can not be defined properly. A clean one Separation of the hot gas utilization in the primary section from the condensation in the Secondary section is not possible. This makes the gas burner uneven loaded. Ultimately, the known arrangement leads to deterioration Heat exchange conditions.

Starting from the prior art, the invention is based on the object a heat exchanger, especially for domestic hot water, ready to provide, which is easier to maintain and where Heat exchange conditions are significantly improved.

This object is achieved with the in the characterizing part of claim 1 specified features solved.

An essential point of the invention is that now the coiled Pipe is divided into two fluidically connected length sections, of which a primary section has a horizontal central axis and the Gas burner encloses at a distance, during which the displacement body enclosing secondary section of the tube has a vertical central axis.

This arrangement of the longitudinal sections of the tube becomes the prerequisite created so that the gas burner easily from the front is accessible so that after removal of at least parts of the box cladding the fitter has no problems, repair and maintenance work on the gas burner to be able to perform. A removal of the box from the wall is no longer required.

Another advantage of the invention is seen in that the unique Separation of hot gas utilization in the primary section with a horizontal central axis and the condensation in the secondary section with the vertical central axis of the Gas burner is subjected to an even load, what the Heat exchange ratios significantly improved.

Furthermore, this arrangement ensures that in the primary section of the Heat exchanger the combustion gases are cooled down so much that a special insulation of the housing can be omitted. This will make the effort further decreased.

The combustion gases are in the secondary section with a vertical central axis then cooled so far that at return temperatures below the dew point of Combustion gas condensate is generated at the bottom of the Secondary section is derived.

In the primary section, the pipe can be unribbed. The secondary section of the pipe but is ribbed. There are then two in the embodiment according to the invention Segment-like circumferential areas pointing towards the condensate drainage each Rib along oblique to the flow direction of the combustion gas Kink lines to each other, bent in a V-shape by about 90 ° from the rib plane. As a result, a gap is formed between these peripheral regions. With this The design of the fins is a deliberate narrow flow around the tube Combustion gases reached, with the higher resulting Flow velocity the droplets formed during the condensation entrained and transferred to the condensate drain. The heat transfer performance will be further improved.

An advantageous development of the invention provides according to claim 2 that two diametrically next to the pipe in the flow direction of the combustion gas opposite segment-like peripheral regions of each rib of the im Channel lying secondary section of the tube along to the flow direction of the Combustion gas in parallel buckling lines at 90 ° from the rib plane folded and between each other in the circumferential direction of the ribs following folded circumferential areas column are provided. To this The flow of the combustion gases in the ring channel becomes like this periphery of the combustion body is further improved, that is, together with the V-shaped bevelled circumferential areas carried that the combustion gases are brought close to the pipe in order to further improve the heat exchange conditions.

According to the features in claim 3, but that of Gas burner passes through the primary section of the pipe at a parallel distance to each other arranged, in the initial state round ribs can be equipped. Here are then advantageously two in the flow direction of the Combustion gas lying on the front circumferential areas along each rib Direction of flow of the combustion gas of inclined fold lines bent to each other in a V-shape by about 90 ° from the plane of the ribs, so that a gap is formed between the peripheral regions. This shape means again a close introduction of the combustion gases to the pipe in the Primary section with a view to intensive heating of the water in the pipe.

Based on the formation of the ribs in the secondary section, it is according to the Features of claim 4 possible that in the flow direction of Combustion gas next to the pipe in the gas burner Primary section lying segment-like circumferential areas along each rib Flow direction of the combustion gas of parallel bend lines by 90 ° folded to the rib plane and between two in the circumferential direction of the rib successive circumferential areas column are provided. hereby the heat exchange conditions are also further improved.

The life of the heat exchanger according to the invention will then still be increased if, according to claim 5, the tube and the ribs from one against Combustion gas and its condensate resistant material. Depending on This material can be used in particular aluminum or stainless steel. But other materials, even in combination, are conceivable in individual cases.

Figur 1

im schematischen vertikalen Längsschnitt einen Wärmeaustauscher für einen Warmwasserbereiter;

Figur 2

in vergrößertem Maßstab den Ausschnitt II der Figur 1;

Figur 3

ebenfalls in vergrößertem Maßstab den Ausschnitt III der Figur 1;

Figur 4

in vergrößertem Maßstab eine Seitenansicht auf einen Längenabschnitt eines wendelförmigen Rohrs gemäß dem Pfeil IV der Figur 1 und

Figur 5

eine Draufsicht auf die Darstellung der Figur 4 gemäß dem Pfeil V.

The invention is explained in more detail below on the basis of an exemplary embodiment illustrated in the drawings. Show it:

Figure 1

a schematic vertical longitudinal section of a heat exchanger for a water heater;

Figure 2

on an enlarged scale the detail II of Figure 1;

Figure 3

likewise on a larger scale, section III of FIG. 1;

Figure 4

on an enlarged scale a side view of a longitudinal section of a helical tube according to the arrow IV of Figures 1 and

Figure 5

a plan view of the illustration of Figure 4 according to arrow V.

1 in FIG. 1 denotes a housing of a heat exchanger WAT in addition to control units and control units, not shown, in one also not integrated box is integrated, the total as a water heater in a household can be hung on a wall.

In the housing 1, a coiled tube 2 is incorporated, which consists of two Length sections 3, 4 are composed. One end 5 of the tube 2 is at one only schematically illustrated cold water supply 6 and the other end 7 a likewise only schematically illustrated consumer 8 for hot water connected.

The primary section 3 of the upper section 9 of the housing 1 Tube 2 has a horizontal central axis 10 and that in the lower height region 11 lying secondary section 4 has a vertical central axis 12.

In the primary section 3 is a gas burner 13 with radially directed outlet nozzles 14 arranged. The gas supply is not illustrated in detail.

The secondary section 4 of the tube 2 is located in a channel 15 circular cross section, on the one hand through the inner surface 16 of the Housing 1 and on the other hand by the outer surface 17 of a peripheral side closed displacement body 18 is formed. Channel 15 is not shown in FIG shown connected to a condensate drain 19.

The tube 2 is in the primary section 3 as well as in the secondary section 4 Initial state of round ribs 20 spaced apart from one another Mistake.

As can be seen in detail in FIGS. 2, 4 and 5, the ribs 20 in FIG Secondary part 4 two segment-like pointing in the direction of the condensate drain 19 Circumferential regions 21 along the direction of flow STR of the combustion gas inclined folding lines 22 to each other V-shaped by about 90 ° from the Ribbed plane RE folded. That way, between these Circumferential regions 21 a gap 23 is formed. FIGS. 2, 4 and 5 also show that also two in the flow direction STR of the combustion gas next to the pipe 2 diametrically opposed segment-like circumferential regions 24 of each rib 2 of the secondary section 4 along the flow direction STR of the Combustion gas of parallel bending lines 25 through 90 ° from the Rib plane RE are folded. This will separate between two Circumferential direction UR of the rib 20 successively folded Circumferential areas 21, 24 formed column 26.

The formation of the folded peripheral regions 21, 24 leads to the fact that the Combustion gases in the duct 15 are brought close to the tube 2, so that the Heat transfer conditions can be significantly improved.

The ribs 20 in the primary section 3 are also two in the flow direction STR 1 circumferential regions 27 of each rib 20 of the combustion gas along the direction of flow STR l of the combustion gas Kink lines 28 to each other in a V-shape by about 90 ° from the rib plane RE folded (Figures 1 and 3 as well as Figures 4 and 5). A gap 19 is formed between the peripheral regions 27. Furthermore show Figures 1 and 3 and in a corresponding adjustment Figures 4 and 5 that in the flow direction STR l of the combustion gas next to the tube 2 in Primary section 3 lying segment-like circumferential regions 30 of each rib 20 running parallel to the flow direction STR l of the combustion gas Kink lines 31 are bent by 90 ° to the rib plane RE. Through this and through the V-shaped bevelled peripheral areas 27 are between two in Circumferential direction UR successive circumferential areas 27, 30 column 32 educated.

The combustion gases emerging from the outlet nozzles 14 of the gas burner 13 are therefore directed exactly radially outwards and closely to the pipe 2 brought up, so that the heat exchange conditions clearly here be improved. The gases then enter in accordance with arrows 32 the channel 15 and here, as described above, closely around the pipe 2 performed in the secondary section.

REFERENCE NUMBERS

1 -

casing

2 -

pipe

3 -

Primary section v. 2

4 -

Secondary section v. 2

5 -

End of v. 2

6 -

Cold water supply

7 -

End of v. 2

8th -

consumer

9 -

upper height range v. 1

10 -

Central axis v. 3

11 -

lower height range v. 1

12 -

Central axis v. 4

13 -

gas burner

14 -

Outlet nozzle v. 13

15 -

channel

16 -

inner surface v. 1

17 -

outer surface v. 1

18 -

displacer

19 -

condensate drainage

20 -

ribs

21 -

Circumferential areas v. 20

22 -

Kink lines v. 21

23 -

Column between 21

24 -

Circumferential areas v. 20

25 -

Kink lines v. 24

26 -

Column between 21 u. 24

27 -

Circumferential areas v. 20

28 -

Kink lines v. 27

29 -

Gap between 27

30 -

Circumferential areas v. 20

31 -

Kink lines v. 30

32 -

arrows

RE -

ribs level

STR -

flow direction

UR -

Circumferential direction v. 20

WAT -

heat exchangers

Claims (5)

Heat exchanger, which has an at least partially finned tube (2) which is incorporated into a housing (1) in a helical configuration and has one end (5) to a cold water supply (6) and the other end (7) to a consumer (8 ) for hot water, a gas burner (13) provided with radially directed outlet nozzles (14) in a primary section (3) of the pipe (2) adjacent to the cold water supply (6) and a vertical central axis (12) adjacent to the consumer (8) 12) having a secondary section (4) of the tube (2) in a channel (15) formed by the inner surface (16) of the housing (1) and the outer surface (17) of an inner displacer (18) with an annular cross section and lower condensate drain (19) are arranged, characterized in that the primary section (3) of the tube (2) enclosing the gas burner (13) at a distance has a horizontal central axis (10) and that the channel (15) penetrating secondary section (4) of the tube (2) is provided with parallel ribs (20) oriented parallel to one another, two segment-like peripheral regions (21) of each rib (20) pointing in the direction of the condensate discharge (19) along the flow direction (STR) of the combustion gas oblique bending lines (22) are bent in a V-shape to each other by approximately 90 ° from the rib plane (RE) and a gap (23) is formed between the peripheral regions (21). Heat exchanger according to claim 1, characterized in that two segment-like circumferential regions (24) of each rib (20) of the secondary section (4) lying in the channel (15) lying in the channel (15) lie diametrically opposite one another in the flow direction (STR) of the combustion gas next to the tube (2) Flow direction (STR) of the combustion gas of parallel bending lines (25) bent by 90 ° from the rib plane (RE) and between two circumferential areas (21, 24) successively bent in the circumferential direction (UR) of the rib (20) are provided (26) , Heat exchanger according to claim 1 or 2, characterized in that the primary section (3) of the tube (2) penetrated by the gas burner (13) is equipped with round ribs (20) arranged at a parallel distance from one another, in which two in the flow direction (STR l ) of the combustion gas lying at the front circumferential regions (27) of each rib (20) along bent lines (28) which are oblique to the flow direction (STR 1) of the combustion gas and are bent in a V-shape by approximately 90 ° from the rib plane (RE) and between the circumferential regions (27 ) a gap (29) are formed. Heat exchanger according to one of Claims 1 to 3, characterized in that, in the flow direction (STR l) of the combustion gas, alongside the tube (2) in the primary section (3) penetrated by the gas burner (13), segment-like circumferential regions (30) lie along each rib (20) to the flow direction (STR 1) of the combustion gas, parallel bend lines (31) are bent by 90 ° to the rib plane (RE) and between two circumferential regions (27, 30) successive in the circumferential direction (UR) of the rib (20) there are gaps (32) , Heat exchanger according to one of Claims 1 to 4, characterized in that the tube (2) and the fins (20) consist of a material which is resistant to the combustion gas and its condensate.

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