DE9209875U1 - Domestic water heater - Google Patents

Description

Joh. Vaillant GmbH u. Co. GM 1062

The invention relates to a domestic water heater with a heating medium source, in particular a primary heat exchanger acted upon by a burner for heating heating water, which is connected to a domestic water heat exchanger intended for the preparation of domestic water and flows through its primary circuit, which contains a domestic water buffer tank which is connected in series with the secondary branch of the domestic water heat exchanger and through which the domestic water flows.

Such domestic water heaters are usually combined with hot water preparation. In order to ensure sufficient storage of domestic water, it is necessary to provide a suitably large domestic water heat exchanger in the known domestic water heaters of this type, where the domestic water supply is kept almost exclusively in the domestic water heat exchanger. However, this leads to corresponding problems in the design of such facilities.

In addition, these known solutions have the problem that after longer breaks in tapping, relatively long heating times for the domestic water arise.

The aim of the invention is to avoid these disadvantages and to propose a domestic water heater of the type mentioned at the beginning, which ensures a rapid provision of warm domestic water even after longer tapping breaks.

According to the invention, this is achieved by the fact that the domestic water buffer tank is located on the secondary side of the domestic water heat exchanger
is connected upstream.

These measures ensure that during longer dispensing breaks, the domestic water in the domestic water buffer tank is heated up by the heat radiation inside the housing.
The higher temperatures prevailing at the heat source mean that domestic water with a
sufficient temperature is available

Furthermore, it can be provided that the domestic water buffer tank is designed as a heat exchanger, whereby the heat
The flowable part of the domestic water buffer tank is connected upstream of the secondary branch of the domestic water heat exchanger and the
The circuit of the domestic hot water buffer tank through which the heating water flows is connected downstream of the primary branch of the domestic hot water heat exchanger.

These measures enable preheating of the domestic water in the
Domestic hot water buffer storage is possible using the heating water heated during the previous tapping, by heating water being
flows through the domestic hot water buffer tank.

If the domestic water in the buffer tank cools down during long breaks in use, it is possible to heat it up again using heating water.

This significantly shortens the heating time of the domestic water at the next tap.

According to another feature of the invention, it can be provided that the domestic water buffer tank is formed by an outer boiler through which the heating water can flow, in which another inner boiler is arranged to receive the domestic water, the inner boiler being kept at a distance from the walls of the outer boiler.

These measures result in a corresponding preheating due to the flow of heating water through the domestic water buffer tank and thus a shortening of the heating-up time when tapping begins after a longer break.

Furthermore, it can be provided that the domestic water buffer tank is formed by a boiler through which the domestic water can flow, which is penetrated by a pipe, possibly in a winding manner, which is connected to the primary branch of the domestic water heat exchanger.

This solution also offers the advantages explained above, and is characterized by a particularly simple structure.

According to another feature of the invention, it can be provided that the inflow to the domestic water buffer tank is connected to the outlet of the secondary branch of the domestic water heat exchanger via a pump and a check valve, the check valve

valve in the direction of the inlet of the domestic water buffer tank.

With this solution, heated domestic water can be pumped into the domestic water buffer tank during tapping, so that the contents of the domestic water buffer tank can be brought to a relatively high temperature at the end of tapping. This means that domestic water at a relatively high temperature is available when tapping begins, even after a longer tapping break. In addition, this also prevents the heating circuit from cooling down when tapping begins after a longer tapping break during the ignition phase, even with burner-heated devices.

The invention will now be explained in more detail with reference to the drawing.

Showing:

Figures 1 and 2 schematically show a device according to the invention,

Figures 3 and 4 schematically show further embodiments of devices according to the invention.

In the embodiment according to Figure 1, the domestic water heat exchanger 1 is constructed in the usual way and has a heating water inlet 2. The heating water flows into the interior of the domestic water heat exchanger 1, which has a boiler 3, and in this boiler 3 a pipe coil 4 through which the domestic water can flow is arranged.

The interior of the boiler 3 is connected to the interior of a domestic water buffer tank 8 or its outer boiler 5, in which an inner boiler 6 is arranged, which is held at substantially equal distances from the walls of the outer boiler 5.

This inner boiler 6 is connected to the pipe coil 4 and is also flowed through by the domestic water. The cold domestic water flows into the inner boiler 6 via the domestic water inlet 7, flows through it and reaches the pipe coil 4 of the domestic water heat exchanger 1, from where it flows heatedly to the tap via the domestic water outlet 10. In the area of the pipe coil 4, the domestic water is heated by the heating water, which flows into the boiler 3 of the domestic water heat exchanger 1 and from there into the outer boiler 5 of the domestic water buffer tank 8. The heating water flows out of this via the outlet 9.

As can be seen from Figure 2, the domestic water heat exchanger 1 and the domestic water buffer tank 8 are arranged close to one another and surrounded by an insulating layer 11, for example made of insulating foam.

The domestic water flows into the domestic water buffer tank 8 via the inlet 7 of the inner boiler 6.

The embodiment according to Figure 3 differs from that according to Figures 1 and 2 only in the structure of the domestic water buffer tank 8. This has a pipe 14 inside its boiler 5, which can be designed as a pipe coil if necessary.

This pipe 14 is connected to the primary branch of the service water heat exchanger 1 and to the outlet 9.

In this embodiment, too, heat exchange occurs during tapping between the heating water flowing through the domestic water buffer tank 8 and the incoming domestic water.

In the embodiment according to Figure 4, the heating water outlet 9 is connected to the boiler 3 of the domestic water heat exchanger 1, whereby the pipe coil 4 forming the secondary branch of the domestic water heat exchanger 1 is connected to the interior of the boiler 5 of the domestic water buffer tank 8, via whose domestic water inlet 7 the domestic water flows in.

However, the domestic water outlet 10 of the domestic water heat exchanger 1 is connected to the domestic water inlet 7 of the domestic water buffer tank 8 via a pump 12 and a non-return valve 13. When the pump 12 is in operation, the non-return valve 13 opens, whereby heated domestic water can be guided in a circuit comprising the secondary branch of the domestic water heat exchanger 1 and the domestic water buffer tank 8.

During tapping breaks, during which the heating circuit is kept in operation, heated domestic water can be fed into the domestic water buffer tank 8 so that its contents are heated and are available when tapping begins.

Claims (5)

Joh. Vaillant GmbH u. Co. GM 1062 CLAIMS 1. Domestic water heater with a heating medium source, in particular a primary heat exchanger acted upon by a burner for heating heating water, which is connected to a domestic water heat exchanger provided for the preparation of domestic water and flows through its primary branch, which contains a domestic water buffer tank which is connected in series with the secondary branch of the domestic water heat exchanger and through which domestic water flows, characterized in that the domestic water buffer tank (8) is connected upstream of the domestic water heat exchanger (1) on the secondary side. 2. Domestic water heater according to claim 1, characterized in that the domestic water buffer tank (8) is designed as a heat exchanger, the part of the domestic water buffer tank (8) through which the domestic water can flow being connected to the secondary branch of the domestic water heat exchanger (1) upstream and the part of the domestic water buffer tank (8) through which the heating water can flow is connected downstream of the primary branch of the domestic water heat exchanger (1). 3. Domestic water heater according to claim 1, characterized in that the domestic water buffer tank (8) is formed by an outer boiler (5) through which the heating water can flow and in which a further inner boiler (6) receiving the domestic water is arranged, the inner boiler (6) being held at a distance from the walls of the outer boiler (5). 4. Domestic water heater according to claim 1, characterized in that the domestic water buffer tank (8) is formed by a boiler (5) through which the domestic water can flow, which is penetrated by an optionally winding pipe (14) which is connected to the primary branch of the domestic water heat exchanger (1). 5. Domestic water heater according to claim 1, characterized in that the inflow (7) to the domestic water buffer tank (8) is connected to the outlet (10) of the secondary branch of the domestic water heat exchanger (1) via a pump (12) and a check valve (13), the check valve (13) being directed towards the inflow (7) of the domestic water buffer tank (8) can be flowed through.