DE20020370U1 - Component for liquid / air heat exchanger - Google Patents

Description

Component for liquid/air heat exchanger

The present invention relates to a component for liquid/air heat exchangers for normal boilers as well as for condensing boilers.

There are different designs for such heat exchangers.

One design option provides for a substantially cylindrical main body having an inlet chamber for heated air and an outlet chamber for cooled air at its ends.

These two chambers are connected by several pipes for the passage of air, which pass longitudinally through a substantially cylindrical chamber through which the liquid to be heated is sent.

The pipes are straight and elongated and have a lens-shaped cross-section.

They are arranged radially and have transverse constrictions along their entire length, which cause turbulence in the movement of the air, which in turn causes the air to remain longer inside the pipe itself. This increases the amount of heat exchanged with the fluid.

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Such pipelines are simply manufactured by bending flat metal material and therefore have a weld seam in the longitudinal direction.

The fact that these pipes have to be welded longitudinally is one of the main disadvantages of this type of heat exchanger.

In addition, these pipes must also be butt-welded to corresponding perforated plates that form the bottom and top of the inlet chamber and the outlet chamber for the air, and the lens-shaped cross-section of the pipes makes this process particularly difficult.

Furthermore, despite the constrictions, the pipeline as a whole does not allow the air to remain inside it for an adequate period of time, which has a detrimental effect on the amount of heat exchanged between air and liquid and therefore on the overall efficiency of the heat exchanger.

The main aim of the present invention is to provide a component for liquid/air heat exchangers which solves or significantly reduces the problems occurring with known components.

Within this objective, one task is to produce a component that does not require longitudinal welding.

Furthermore, a component must be specified on which butt welds can be easily implemented.

A component must be specified with a structure such that the air flowing through the interior of the component inevitably experiences increased turbulence and continues to flow at a low speed.

A further object is to provide a component for liquid/air heat exchangers which is characterized by a high thermal efficiency.

A component must be specified that is easy to implement.

These and other objects resulting from the following description are achieved by a component for liquid/air heat exchangers, the passage for a heat exchange fluid of which extends in the longitudinal direction and which is characterized in that it has a cross-section with a plurality of projections arranged in a substantially radial direction.

Further features and advantages of the present invention will become apparent from the description of a preferred embodiment of the invention, which is illustrated by way of non-limiting example in the accompanying figures, in which

Figure 1 is a partially sectioned front view of a liquid

ity/air heat exchanger with the component according to the invention;

Figure 2 is a plan view of the section of the heat exchanger shown in Fig. 1.

meta exchangers;

Figure 3 shows a section of a component according to the invention;

Figure 4 shows the cross-section of the component shown in Fig. 3;

Figure 5 shows a second embodiment of the inventive

component; and

Figure 6 shows the cross section of the component shown in Fig. 5.

In Figures 1 to 4, a first embodiment of a component according to the invention is identified overall by the reference numeral 10.

The component 10 is elongated and has a cross-section 11 formed from three projections 12, wherein the projections 12 are arranged substantially in the radial direction with a mutual distance of 120 angular degrees.

The ends 13 of the projections 12 are rounded and their width decreases in the radial direction from the outside to the inside, being connected to one another by curved sections 14 near the center of the cross-section 11.

The component 10 is helical in the longitudinal region having the cross-section 11, but has round sections 15 at the ends.

Fig. 1 shows a heat exchanger 16 in which the component 10 is mounted.

The heat exchanger 16 has a substantially cylindrical body 17 with an upper region 18 for the inlet of the warm air and a lower region 19 for the outlet of the cooled air.

The two regions 18 and 19 are connected to one another by a plurality of components 10 which are arranged longitudinally in the radial direction and uniformly fill the heat exchange chamber 20 enclosed between the upper region 18 and the lower region 19, through which the liquid to be heated is sent.

A second embodiment of the invention is illustrated in Figures 5 and 6 and is generally designated by the reference numeral 110.

The cross-section 111 has three projections 112 with rounded ends 113, which are arranged in the radial direction with a mutual distance of substantially 120 degrees and whose width decreases from the outside to the inside in the radial direction.

Near the center of the cross section 111, the projections 112 are connected to each other by curved sections 114.

In this embodiment 110, the component is essentially straight.

As regards the operation, it can be seen that the air flowing through the components 10 and 110 is retained for a longer period inside the component itself thanks to the special shape of the respective component cross-section and course, whereby its speed is reduced and the thermal efficiency of the heat exchanger is considerably increased.

Preferably, a circle with a diameter of 2 to 7 mm can be written in the middle of the cross section 11 and 111 within the curved sections 14 and 114, wherein 2 mm is an optimal dimension for a component according to the invention for use in condensation boilers.

In practical application it is shown that the present invention solves the problems set.

It should be noted that such components can easily be manufactured by deforming a metal tube.

However, since the ends of the pipelines remain round, the problems associated with butt welding pipelines with cross-sections of complex geometry can be avoided.

In the practical implementation of the invention, all materials used, as long as they are suitable for the specific purpose, as well as shapes and dimensions can be varied depending on the requirements.

Claims (9)

1. Component for liquid/air heat exchangers with a longitudinally extending passage for a heat exchange fluid, characterized in that the component has a cross-section with a plurality of projections arranged in a substantially radial direction. 2. Component according to claim 1, characterized in that the projections have rounded ends and their width decreases in the radial direction from the outside to the inside, the projections being connected to one another by curved sections near the center of the cross section. 3. Component according to claims 1 and 2, characterized in that the cross section has three projections which are spaced apart by substantially 120 angular degrees. 4. Component according to claim 3, characterized in that it is straight in the longitudinal direction. 5. Component according to claims 1 to 3, characterized in that it extends helically in the longitudinal direction. 6. Component according to claims 1 to 5, characterized in that it contains end sections with a cylindrical cross-section. 7. Component according to one or more of the preceding claims, characterized in that a circle with a diameter of 2 to 7 mm can be written in the cross section between the connecting sections of the projections. 8. Liquid/air heat exchanger with a chamber for the passage of a first heat exchange fluid, which is crossed by pipes for the passage of a second heat exchange fluid, characterized in that the pipes consist of components according to one or more of the preceding claims. 9. Heat exchanger according to claim 8, having a substantially cylindrical shape, characterized in that it comprises a plurality of pipes for the passage of a heat exchange fluid distributed throughout the liquid passage chamber.