EP1688681A1 - Heat cell for a hot water heater - Google Patents

Abstract

The heat cell (1) comprises a holder element (2) with housing sleeve (3) containing a tubular coil (4). The holder element and at least one part of the housing sleeve are formed in one piece. The one-piece part of the heat cell is made from a pressed profile. The housing sleeve is cylindrical and comprises two half shells (31,32) of which one is formed integral with the holder element. The ends of the tubular coil are guided through the holder element perpendicular to the surface thereof.

Description

The invention relates to a heat cell for a hot water generator with a support member having a housing shell, within which a through the housing shell outwardly guided coiled tubing for a heat transfer fluid as a heat exchanger and in this a burner unit are arranged, with a housing jacket final lid and floor element.

Previously known are devices for hot water production, which generate the required heat by burning gaseous or liquid fuels. The oxygen required for combustion is obtained by suction of the ambient air. About a mixing unit, the merger of air and fuel takes place. The mixture is then burned in a suitable furnace, around which a water-carrying heat exchanger is arranged. Such a trained heat exchanger is designed as a helically bent tube, which may be smooth or ribbed executed. Corresponding partitions enclose the heat exchanger. These partitions are heated and generate depending on the design and location of the heater corresponding heat losses.

From the document DE 101 48 914 C2, a heating device with a heat exchanger cartridge is known, one of a heat transfer fluid has flowed through channel and encloses an inner space, which has on at least one side an opening which is surrounded by an edge, which leads along the outer diameter of the heat exchanger cartridge. Also, a burner unit is arranged, which has a burner body arranged in the interior with a plurality of burner openings and a flange whose diameter exceeds the diameter of the edge of the heat exchanger cartridge and the end faces the heat exchanger cartridge and has a seat for a blower unit and with a fastening device by means of which Flange is connected to the heat exchanger cartridge to attach the burner unit to the heat exchanger cartridge.

A further development of the heating device is known from the document DE 102 42 643 A1. In the described solution, the space enclosed by the coiled tubing interior is divided into at least two subspaces, with a support tube which extends through one of the subspaces and which supports the insulator from the side. The burner unit, which extends through the other subspace of the interior, thereby supporting the insulating body from the other side.

Furthermore, EP 1 255 086 A2 discloses a heat exchanger unit for a heating device, in which the heating channel serving for heat exchange has, at least in sections, a wall made of aluminum or an aluminum alloy.

In the previously known solutions, numerous individual parts have to be added and, in particular, the passage points of the supply and return connections of the heating coils must be sealed by the cylindrical casing by means of a complex welded connection.

The invention is therefore based on the object to develop a heat cell, with a higher integration of different functional units is achieved.

The invention is represented by the features of claim 1. The further claims 2 to 12 give advantageous embodiments and further developments of the invention.

The invention includes the technical teaching to provide a heat cell for a hot water generator with a support member having a housing shell within which are arranged with the ends by the housing shell outwardly guided coiled tubing for a heat transfer fluid as a heat exchanger and in this a burner unit, with a lid and bottom element closing off the housing jacket, wherein the holding element and at least a part of the housing jacket are formed in one piece.

The invention is based on the consideration that a high integration of several functional units is achieved by the one-piece design. The support member is either fixed to a part of the housing shell, for example, on a wall surface, or even with little effort from a base carrier removably formed. As a basic carrier can serve a simple wall-side metal sheet.

The ends of the tube spiral guided outward through the housing jacket or the retaining element can be located in different planes and can be arranged offset relative to one another. Also, a non-linear connection of the two passage levels is being considered.

The advantages achieved by the invention by reducing the number of components in a device are, in particular, that the heat cell can be realized more efficiently, in terms of manufacturing technology, simpler and thus less expensive. In particular, such heat cells can be adapted to the overall design with little design effort and into the plants be installed for hot water production. Higher integration saves additional components and associated additional connections. As a further advantage of the invention, the attachment of the pipe ends of the helix can be carried out correspondingly inexpensively and the desired higher integration of various functional units in a housing part can be realized. This can also achieve an increase in the efficiency of these heaters.

In a preferred embodiment of the invention, the integrally formed part of the heat cell can be made of a press profile. Such profiles can be manufactured particularly cost-effective in large quantities. By pressing the plane of the profile is configured continuously in the flow direction of the material. This direction is parallel to the axis of symmetry of the example cylindrical housing shell. The integrally formed part may preferably be made of aluminum or of an aluminum alloy.

Advantageously, the housing shell may consist of two cylindrical half-shells, one of which is formed integrally with the support member. This too can be realized by means of pressing profiles due to the symmetry conditions.

Furthermore, the attachment of the tangential pipe ends of the helix should be carried out as inexpensively and be reduced by a high integration density as possible, the number of components in a device. In a preferred embodiment, the ends of the coiled tubing may be passed through the holding element perpendicular to the surface thereof. Thus, the pipe ends in the press profile circular, the pipe circumference following, according to simple and inexpensive welded to ensure the flue gas side seal.

Advantageously, a pipe section of a running along the housing shell Exhaust pipe to be formed integrally with the support member and / or at least with a half-shell of the housing shell. As a result, a particularly high integration of the individual modules is achieved.

In a preferred embodiment of the invention, at least one of the pipe ends can each open into a flow channel formed in the support element or return side channel for the heat transfer fluid, wherein the flow or return end of the channel is configured connectable to the periphery. This creates scope for the structural design with regard to the guidance of the heat transfer fluid.

Advantageously, the flow or return-side channel can extend through the cover element and / or at least along a section on the housing jacket. As a result, the heat transfer fluid can be performed independently of the arrangement of the coiled tubing by the pipe ends are no longer led to the periphery itself, but open into an additional channel within the heat cell. Thus, the heat cell is cooled on its outer wall and in the lid area. In particular, by the cooling of the lid, which covers the combustion chamber, the heat is selectively supplied to the heat transfer fluid and contributes to the increase in efficiency. In this case, if necessary, even the otherwise usual lid-side insulation can be saved.

Advantageously, the housing wall facing away from the rear wall of the support member may be formed substantially flat. The resulting connection surface of the support member is formed in a simple manner on a wall surface or connectable to a base support. In the case of a press profile, however, uniformly flat surfaces will necessarily be present only in the pressing direction for constructional reasons.

Environmental regulations to minimize energy consumption require an increase in the efficiency of these heaters. This can be done through various constructive measures can be achieved, for example, by increased insulation of the devices to reduce heat losses and / or by preheating the combustion air. For this purpose, in a preferred embodiment of the invention, to increase the efficiency of the heat cell enclosing the housing shell to be surrounded by a further outer housing shell, which is guided by the cavity formed between the housing shells supply air for the burner unit.

The air outlet of the intake air from the cavity can advantageously be performed via a hose directly into the intake of the blower unit connected to the burner unit.

In a preferred embodiment, the air inlet of the intake air can be guided directly from the environment into the cavity via a hose line.

For particularly simple constructive interpretations, the air inlet into the cavity and the air outlet from the cavity can take place without positive guidance alternatively in a preferred embodiment.

Advantageously, further longitudinal grooves for fixing peripheral parts can be arranged on the integrally formed part of the heat cell. The longitudinal grooves, for example on a press profile, also belong to the integral part of the one-piece support element and housing shell. Such longitudinal grooves can serve, for example, for receiving and fixing sensors for the housing temperature or as guide slots for electrical lines. In addition, a groove results in an increase in the wall thickness, which as a whole contributes to a stiffening of the overall structure.

For mounting so no additional holes are required because the longitudinally oriented openings in the channels the required diameters of For example, helical fasteners are already adjusted. Also, over the length of the longitudinal grooves, the attachment of fasteners in the axial direction, seen over the height of the housing, variably possible, since in contrast to holes no fixed point is given

Embodiments of the invention will be explained in more detail with reference to a schematic drawing.

Fig. 1

einen Querschnitt einer Wärmezelle mit doppelwandigem Gehäusemantel und Schlauchanschluss für die Zuluft der Brennereinheit,

Fig. 2

einen Querschnitt einer Wärmezelle mit doppelwandigem Gehäusemantel mit einem Rohrabschnitt des Abgasrohres,

Fig. 3

einen Längsschnitt einer Wärmezelle mit doppelwandigem Gehäusemantel zur Luftvorwärmung mit Schlauchanschlüssen zur Führung der Zuluft,

Fig. 4

einen Längsschnitt einer Wärmezelle mit doppelwandigem Gehäusemantel zur Luftvorwärmung nur mit brennerseitigem Schlauchanschluss zur Führung der Zuluft,

Fig. 5 a-c

eine n Querschnitt einer Wärmezelle mit unterschiedlichen Ausgestaltungen der Rückwand,

Fig. 6

einen Querschnitt einer Wärmezelle mit Kanälen für das Wärmeträgerfluid im Halterungselement und Gehäusemantel,

Fig. 7

einen Längsschnitt der Wärmezelle mit Kanälen für das Wärmeträgerfluid im Halterungselement und Gehäusemantel in den Schnittebenen A-A und B-B nach Fig. 6.

Show:

Fig. 1

a cross section of a heat cell with double-walled housing shell and hose connection for the supply air of the burner unit,

Fig. 2

a cross section of a heat cell with a double-walled housing shell with a pipe section of the exhaust pipe,

Fig. 3

a longitudinal section of a heat cell with double-walled housing shell for air preheating with hose connections for guiding the supply air,

Fig. 4

a longitudinal section of a heat cell with double-walled housing shell for air preheating only with burner-side hose connection for guiding the supply air,

Fig. 5 ac

a n cross section of a heat cell with different configurations of the rear wall,

Fig. 6

a cross section of a heat cell with channels for the heat transfer fluid in the support member and housing shell,

Fig. 7

a longitudinal section of the heat cell with channels for the heat transfer fluid in the support member and housing shell in the cutting planes AA and BB of FIG. 6.

Corresponding parts are provided in all figures with the same reference numerals.

The schematic representation of the heat cell 1 according to FIG. 1 consists of a double-walled housing jacket 3 and 9 for the supply air of the burner unit.
The support member 2 is formed integrally with the half-shell 32 of the cylindrical housing shell 3. Particularly cost-effective proves for the one-piece component is a press profile made of aluminum or an aluminum alloy. Also, the second half-shell can be made of a press profile. The rear wall 23 of the support member forms a flat surface for easy mounting on a wall-side base support. In addition, longitudinal grooves 24 are arranged for attachment of peripheral parts. Each longitudinal groove 24 reinforces the wall thickness locally and causes a stiffening of the overall structure, which can be configured with a smaller wall thickness.

The pipe ends 41 and 42 thereby form an angle of 90 ° with the plane of the press profile, whereby a simple round weld is applied to seal the passage point. Due to the planar design of the respective housing wall segment thus a simplified two-dimensional, lying in a plane mounting the helix with the profile is possible. Alternatively, a seal by means of an O-ring is conceivable. In contrast to this, the solution envisaged in the prior art is not a plane, the opening through the jacket for the ends of the coiled tube forms an elliptical shape. As a result, the sealing of the pipe ends relative to the housing shell is correspondingly more expensive.

The second half-shell 31 is detachably connected by means of a screw connection, however, both half-shells can also be joined by a welded connection, for example.

Within the housing shell 3, the spirally extending coiled tubing 4 is arranged for heat exchange, the tube ends 41 and 42 are guided through the housing shell 3 and in this case by the support member 2 to the outside. In the coiled tubing 4, the burner unit, not shown here, is arranged in the operating state. To increase the efficiency is the housing jacket 3 enclosing the heat cell 1 is surrounded by a further outer housing jacket 9, whereby the cavity 91 is formed between the housing envelopes 3 and 9, through which the supply air for the burner unit is guided during operation. The supply air is collected via the hose 11 and fed to a blower.

The schematic representation of the heat cell 1 according to FIG. 2 consists of a double-walled housing jacket 3 and 9 for the supply air of the burner unit, in which a part of the exhaust pipe 8 is also integrally formed on the support member 3. Thus, a correspondingly high integration of various functional units in a housing part is realized. To attach the heat cell, the integration of other brackets for cover, floor and wall mounting in the housing parts is conceivable.

Fig. 3 shows a longitudinal section of a heat cell 1 with double-walled housing shell for air preheating with hose connections for guiding the supply air. The enclosing housing shell 3 is surrounded by a further outer housing shell 9 only partially. The supply air for the burner unit 5 flows through a hose 11 into the air inlet 92 along the housing shell. The heated air is collected at the air outlet 93 by a further hose 11 and forwarded to the fan unit 10 to the burner unit 5. The blower unit 10 is connected to the burner unit via the cover element 6, which closes off the housing jacket 3. Bodenseitig the housing shell is closed by a bottom element 7. A feature of this design is the closed unit of inner and outer shell casing, i. the air can only flow in a defined channel.

As an alternative, occurs in FIG. 4, the supply air for the burner unit 5 without forced guidance from the housing environment in the open air inlet 92 between the housing shell 3 and the outer housing shell 9 and is again collected at the air outlet 93 through the hose 11 and the Blower unit 10 to the burner unit 5 forwarded. The heated air is fed to the fan without targeted flow guidance. In this solution, especially by convective heat transfer, the passing past the hot housing jacket air is heated. To improve the heat transfer and ribs or webs can be mounted either directly on the hot metallic housing shell 3 or on the outer housing shell 9. When mounted directly on the hot housing shell 3, the heat transfer is improved. Important for the insulation effect to the outside is that the ribs or webs do not touch the outer housing shell. The air inlet is preferably at the bottom of the housing to enhance the cooling effect.

Not shown in the figure can also be dispensed with at the upper air outlet 93 on the hose and a free air outlet near the fan unit 10 fluidly arranged according to favorable to suck from the cavity 91, at least a majority of the air guided therein. By the suction effect of the fan is ensured in any case that an air flow is drawn over the heat cell. Since the combustion gases only heat the inner housing shell 3, the outer housing jacket 9 is used in addition to an increase in the efficiency of the heat cell 1 for insulation, to avoid burns when touched.

Fig. 5 shows the execution of different rear walls of the support member. In Fig. 5A, the pressing profile in the region of the continuous pipe ends is designed substantially flat so that the pipe ends and the plane of the press profile are at an angle of 90 ° zueinender. As shown in FIG. 5B, alternative embodiments may provide significant freedom in the structural design of the support member 2. The profile is continuous by pressing only in the flow direction of the material, other directions are largely freely designable. As FIG. 5C shows, the ends do not necessarily have to emerge parallel to each other, but also can also be arranged offset. It is also conceivable that an outlet is housed in each press profile half shell.

The channels produced integrally in the profile may alternatively be water-carrying as an alternative to the air guide and then serve primarily to cool the housing wall. The water supply in the one-piece press profile can be done via connecting pieces (fittings) via the pipe ends to the pressing profile directly, or via the housing cover. Another possibility of Wasserzuund-removal is the confluence of at least one of the pipe ends 41, 42 within the profile channel. In this connection, Fig. 6 shows a cross section of the heat cell 1 with channels 21 and 22 for water as a heat transfer fluid in the support member 2 and the housing shell 3. Both pipe ends 41, 42 each lead into a arranged in the support member 2 flow or return side channel 21 and 22nd The leading and trailing end of the respective channel 21 and 22 is connected to the periphery via the bottom member 7.

Fig. 7 shows a longitudinal section of the heat cell 1 with channels 21 and 22 for the heat transfer fluid in the support member 2 and housing shell 3 in the sectional planes AA and BB of Fig. 6. The flow direction S is shown in Fig. 7 by the direction of the arrow. The flow-side channel 21 extends along a portion of the housing shell 31, passes through the cover member 6 and downwardly again occurs along the housing shell 32 in the cutting plane AA in the flow-side pipe end 41 in the coiled tubing 4 a. The water to be heated continues to flow through the coiled tubing 4 and enters in the sectional plane BB at the return side tube end 42 in the return-side channel 22 within the support member 2, to be continued beyond the not shown in Figure 7 bottom element 7 to the outside to the periphery ,

LIST OF REFERENCE NUMBERS

1

heat cell

2

supporting member

21

upstream channel

22

return channel

23

rear wall

24

longitudinal groove

3

housing jacket

31

first half shell

32

second half shell

4

coiled tubing

41

upstream pipe end

42

return pipe end

5

burner unit

6

cover element

7

floor element

8th

exhaust pipe

9

outer housing jacket

91

cavity

92

air inlet

93

air outlet

10

blower unit

11

hose lines

S

Flow direction of the heat transfer fluid / water

Claims (14)

Heat cell (1) for a hot water generator with a support member (2) having a housing shell (3) within which a with the ends through the housing shell (3) outwardly guided coiled tubing (4) for a heat transfer fluid as a heat exchanger and in this one Burner unit (5) are arranged, with a housing shell (3) final lid (6) and bottom element (7),
characterized,
in that the retaining element (2) and at least part of the housing jacket (3) are integrally formed. Heat cell according to claim 1, characterized in that the integrally formed part of the heat cell (1) is made of a press profile. Heat cell according to claim 1 or 2, characterized in that the housing jacket (3) is cylindrical. Heat cell according to claim 3, characterized in that the housing shell (3) consists of two half-shells (31, 32), one of which is formed integrally with the support member (2). Heat cell according to one of claims 1 to 4, characterized in that the ends of the coiled tubing (41, 42) are guided through the support member (2) perpendicular to the surface thereof. Heat cell according to one of claims 1 to 5, characterized in that a pipe section of a housing jacket along the running exhaust pipe (8) with the support member (2) and / or at least with a half-shell (31, 32) of the housing shell (3) is integrally formed. Heat cell according to one of claims 1 to 6, characterized in that at least one of the pipe ends (41, 42) respectively in a support element (2) formed in the lead or return-side channel (21, 22) opens for the heat transfer fluid, wherein the lead - or return-side end of the channel is configured connectable to the periphery. A heat cell according to claim 7, characterized in that the flow-side or return-side channel (21, 22) extends through the cover element (6) and / or at least along a section on the housing jacket. Heat cell according to one of claims 1 to 8, characterized in that the housing jacket (3) facing away from the rear wall (23) of the support member (2) is formed substantially flat. Heat cell according to one of claims 1 to 9, characterized in that the housing (3) enclosing the heat cell (1) is surrounded by a further outer housing jacket (9), wherein supply air for the burner unit is formed by the cavity (91) formed between the housing envelopes (5) is guided. A heat cell according to claim 10, characterized in that the air outlet (93) of the intake air from the cavity (91) via a hose line (11) is guided directly into the intake of the blower unit (10) connected to the burner unit (5). Heat cell according to claim 10 or 11, characterized in that the air inlet of the intake air (92) is guided directly from the environment into the cavity (91) via a hose line (11). Heat cell according to claim 10, characterized in that the air inlet (92) into the cavity (91) and the air outlet (93) from the cavity (91) takes place without positive guidance. Heat cell according to one of claims 1 to 13, characterized in that on the integrally formed part of the heat cell (1) further longitudinal grooves (24) are arranged for fixing peripheral parts.

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