EP3366812A1 - Water container with corrosion protection anode device - Google Patents

Abstract

The invention relates to a water tank (100), in particular a hot water tank, on which at least one anticorrosive anode device (200) is mounted, wherein a passage channel (220) is guided through the anticorrosive anode device (200), which in the assembled state of the anticorrosive anode device extends from the interior of the water tank to the outside leads, and wherein the passageway is passed through the anode material and is designed as a vent channel for discharging remaining air from the water tank.

Description

The invention relates to a water tank with anti-corrosion anode device and corresponding anti-corrosion anode device.

As is known, as a corrosion protection anode, e.g. a sacrificial anode is used, which is a piece of base metal used to protect functional parts from other metals, e.g. Iron, steel, and / or brass, is used against contact corrosion, whereby the cheaper material of the sacrificial anode itself destroyed so "sacrificed" is. Thus, the function of corrosion-prone and elaborately made functional parts longer guaranteed and costly new procurement postponed or avoided altogether.

When metal components come into contact with water, humid air or other electrolyte, e.g. the interior of a water tank, especially with water, so attacks z. For example, the dissolved oxygen in the water to the metal (oxidation); It forms a galvanic cell. In the process, electrons are removed from the metal and the positively charged ions pass into the solution, which corrodes the metal. To prevent this, anticorrosion anodes, such as e.g. Sacrificial anodes or external current anode used.

For a sacrificial anode to serve its purpose, it must be in the voltage series of negative (eg, magnesium or zinc) as the metal to be protected.

The metal to be protected is conductively connected to the sacrificial anode. The result is a primary element, which therefore can not be recharged after discharge, and in which the metal to be protected acts as the cathode and the less noble metal as the anode, a current flows in the direction of the metal to be protected. Instead, the less noble sacrificial anode metal releases its electrons to the oxygen, is oxidized, and goes into solution. The water in this local element is the electrolyte, which allows the transport of the charged particles and thus closes the circuit. The sacrificial anode is thus consumed over time and needs to be renewed.

Even with water tanks, hereinafter also referred to as kettle, such corrosion protection is often used, especially in water tanks that include galvanized boiler or enameled hot water tank with steel made basic bodies. For in a water tank with zinc coating, especially in the interior of the water tank, this dissolves without sacrificial anode with time in the water. Even with enameled water tanks sacrificial anodes are required because there is no process to date, which can ensure a permanent 100% error-free internal enamelling of a container. In order to avoid subsequent Durchrostung of the water tank, a sacrificial anode, for example made of magnesium screwed to the container inner wall or introduced and subsequently screwed sealing. For this purpose, rod or chain anodes are often used. The latter are used when the structural conditions (eg height above the insertion opening) are insufficient for the insertion of a rod anode. The going into solution magnesium ions are considered health safe to classify, even if the water is used for food preparation. Depending on the application and local conditions, sacrificial anodes are to be regularly examined for wear (decrease in material thickness) and, if necessary, replaced.

A maintenance-free variant of corrosion protection anodes are external current anodes that are connected to a DC power source and provide permanent corrosion protection. By applying an opposite polarity of the electrode potential between the electrically susceptible material and the foreign current anode, the corrosive material removal can be effectively prevented. In contrast to a sacrificial anode, no material removal takes place at the anode in this method.

All of these corrosion protection anodes are usually mounted externally accessible to the water tank and extend with their anode material in the interior of the water tank.

Further, a drain valve and / or a vent valve is conventionally provided on the water tanks. The drain valves are usually mounted on the lowest point of the water tank and are used for partial emptying or complete emptying of the container to clean it or to replace the corrosion protection anode. Bleed valves are conventionally mounted at a higher location of the water tank to drain any remaining air in the water tank, as well as the presence of an air cushion promotes corrosion.

Consequently, water tanks are usually provided with multiple mounting access from the outside, over which the Anticorrosion anodes and the drain valves and / or vent valve are mounted on the water tank or installed. In addition to the installation effort and the respective required assembly components arise through these mounting access, however, especially in the case of hot water tank additional thermal bridges, so that in addition unwanted heat losses are the result.

The object of the invention is to effectively reduce in particular the above problems. The solution according to the invention is given by a water tank as well as by a corrosion protection anode device with the respective features according to appended independent claims. Preferred developments are Gegenstad the dependent claims.

Accordingly, the invention provides a corrosion protection anode device or a water tank, in particular hot water tank, with at least one anticorrosive anode device mounted thereon, wherein a through-channel is guided through the anticorrosive anode device, which leads in the assembled state of the anticorrosion anode device from the interior of the water tank to the outside.

By combining a through-passage and a corrosion protection anode within a common anticorrosive anode device, according to a preferred embodiment, in particular including a, associated with the passage valve, the corrosion protection anode can together with a drain and / or vent on one and the same mounting access to the water tank mounting device be appropriate or be. If a passage opening communicating with the through-channel is formed by a holding device formed on the anti-corrosion anode device, in particular a hose-like or tube-like line or also a valve can be inserted in a simple manner. The mounting device can therefore simultaneously take on the additional function of a sleeve.

The invention thus opens up the advantageous possibility of reducing the number of thermal bridges present on the water tank and also the required assembly components.

Further features and advantages of the invention will become apparent from the following description of exemplary embodiments with reference to the drawing.

Fig. 1

skizzenhaft eine zweckmäßige Ausführungsform einer Korrosionsschutzanodeneinrichtung gemäß der Erfindung;

Fig. 2

skizzenhaft einen Wasserbehälter mit einer Korrosionsschutzanodeneinrichtung gemäß der Erfindung; und

Fig. 3

skizzenhaft einen vergrößerten Ausschnitt der an den Wasserbehälter montierten Korrosionsschutzanodeneinrichtung nach Fig. 2.

In the drawing show:

Fig. 1

sketchy an expedient embodiment of a corrosion protection anode device according to the invention;

Fig. 2

sketchy a water tank with a corrosion protection anode device according to the invention; and

Fig. 3

sketched an enlarged section of the mounted on the water tank corrosion protection anode device after Fig. 2 ,

Hereinafter reference will be made to the description of embodiments with reference to the figures.

Fig. 1 shows in outline an expedient embodiment of a corrosion protection anode device 200 according to the invention. Again Fig. 1 Referring to this, it has a passageway 220, which is aligned to lead in the mounted state of the anticorrosion anode device to a water tank from the interior of the water tank to the outside. An anticorrosive anode device 200 mounted by way of example on a water tank 100 or a water tank 100 with an anticorrosive anode device 200 according to the invention is in particular the Fig. 2 refer to. The in Fig. 2 water container to be seen also has two feed / removal points 150, through which water can be supplied or removed. Depending on whether it is a cold or hot water tank, the supply point is located in the lower area and the removal point in the upper area or vice versa. In any case, however, for reasons of clarity, any possible heating or cooling devices, such as heat exchanger devices, are not shown in the interior of the water tank. Fig. 3 in turn, sketchily shows an enlarged section of the water tank Fig. 2 mounted corrosion protection anode device.

The corrosion protection anode device expediently has a mounting device 230 for mounting on the water tank. In the mounting device 230, a passage opening 240 communicating with the passage is further formed for the admission of a valve 250, a faucet, not shown in the figures, or a tubular or tubular conduit, not shown in the figures. In the in the Figures exemplary outlined embodiments, a valve 250 is already embedded in the mounting device 230. Instead of the valve 250, however, a hose-like or tubular conduit can also be let in or be, to which then, for example, a valve arranged away from the water tank or arranged valve can be fastened.

As can be seen from the figures, the anticorrosive anode device 230 comprises an anode material 210, which is fastened to the mounting device 230 and is, in particular, exchangeably received by the illustrated mounting device 230. This attachment may e.g. also done by screwing or gluing. It should be noted that alternatively designed mounts can be used in the invention.

In the illustrated embodiments, further, the passageway 220 is passed through the anode material 210. Depending on the type of holder, however, the through-channel can also be guided laterally past the anode material.

The mounting device 230 may in particular be a screw connection device and / or the passage opening 240 of the mounting device 230 is expediently a bore with an incised internal thread.

In a bore with an incised internal thread, for example, the valve 250 (or alternatively also a cock) with a complementarily formed at one end external thread to be screwed in or be already, so that commercially available valves or taps within the scope of the invention Application can come. At the insertion or Einschraubbereich of the valve or cock on or in the mounting device 230 may additionally be clamped between two for improved sealing a gasket 260 for two-sided system or be.

The holding device 230 with the anode material exchanged in particular and the valve, tap or tubular or tubular pipe used therefore particularly preferably functions as a type of sleeve for the essentially uninterrupted connection of the anode material 210, in particular the through-channel 220, and the used valve, tap or an inserted line.

In addition, the mounting device 230 expediently has a mounting end provided with an external thread 235, which can be inserted into a mounting access 160 of the water tank 100 and therefore can be screwed in particularly expediently there. There, too, a sealing material (not shown in the figures) between support device 200 and water tank 100 may be arranged and preferably clamped for further improved sealing.

The anode material sketched in the figures forms, in particular, a sacrificial anode, for example a magnesium anode. Alternatively, however, an external current anode can also be used within the scope of the invention. The electrically conductive connection cable to the (r) necessary for the power supply power supply / power source is here in a further preferred, but not shown for clarity reasons additionally guided by the support means, wherein metallic parts the water tank is provided an electrical insulation. The negative pole of the power supply or the current source can then be connected to the metal to be protected and the positive pole to the external current anode or be.

As already described in the introduction, corrosion protection anodes, in particular magnesium anodes, are used in all kinds of water containers in which the corrosion protection should exist. Such corrosion takes place, for example, due to unfavorable pH values of the water composition, or electrochemical reactions.

Since a designed as a hot water tank water tank is the hottest on the top there are the heat losses the most. With the object of the invention and thus by the combination according to the invention of a corrosion protection anode with eg used as a vent passageway and thus expediently mounted in the upper part of a hot water tank corrosion protection anode device can thus be saved in particular an additional sleeve and a mounting access, instead of a respective sleeve and a mounting access for the anticorrosive anode and for the vent valve. This additionally insulates the heat loss of a hot water tank. The valve, the tap or the further line are thus virtually attached to the head of the corrosion anode (see also Fig. 2 ).

Consequently, a passage channel used as an emptying channel is expediently mounted in the lower region of a water container and thus in particular using a corrosion protection anode device according to FIG Invention. In this case, "the anode material is thus practically upside down".

The invention thus offers flexible use in almost any, especially new or expandable, water tank system.

Possible applications are e.g. designed for energy surplus and hot water storage water tank or water tank systems. Examples include: process water treatment by solar systems, oil-gas solid fuel boilers, water-bearing stoves, electric batons, combined heat and power plants, district heating and many other energy sources. Also, use in combination with (other) buffer memory is within the scope of the invention.

Thus, all today coated (enamelled) or stainless steel water tank, in particular hot water tank with one or more corrosion protection anodes, especially magnesium anodes, for additional corrosion protection, equipped in the rule. The remaining air in the hot water tank must also be drained via a bleed valve. Therefore, as a rule, all present-day drinking, service and / or hot water storage tanks have at least two assembly accesses including pipe openings in the upper area, e.g. on the lid. Consequently, using the invention, it is always possible to reduce two such assembly accesses, including tube openings, to one or one.

Although the arrangement in the upper region in the context of the invention is not mandatory, but the temperature is especially hot water tank on the hottest and top consequently, most of the heat losses are caused by additionally installed pipes (as outputs or inputs).

It is true that a passage channel used as a venting channel or as an emptying channel, in particular with an associated valve for venting or emptying, not least due to the small surface area on the mounting device and therefore also at the top of the anticorrosive anode, usually has a small water flow. However, it has been shown that this is sufficient to let out the left-over air from the reservoir, or to bring down the existing water pressure by emptying a few liters of water. Consequently, a corrosion protection anode can thus easily be taken out for maintenance or a used one can be exchanged for a new one.

Of course, the corrosion protection device according to the invention can be arranged depending on the application and / or prevailing conditions not only in the upper region of a water tank but also laterally or below, in particular at the bottom of the water tank or. For a complete emptying of a water reservoir, however, depending on the volume content, even with a below, in particular at the bottom of the water tank arranged corrosion protection device due to the usually low water flow an additional discharge opening will continue to be appropriate. Depending on the embodiment of the corrosion protection device according to the invention, however, a sufficiently higher water flow can be ensured.

In other words, in the context of the invention, an integrated in the corrosion protection device, provided as an emptying channel passageway is usually mounted on the lowest point of the hot water tank. This serves for partial emptying or complete emptying of the water tank. However, since the water tank can not be vented there as a rule, however, in the context of the invention, a corrosion protection device with an integrated passage channel provided as a vent channel is generally still mounted in the upper area of a water tank, in particular a hot water tank.

LIST OF REFERENCE NUMBERS

100

Water tank;

150

Increase / withdrawal sites;

160

Installation access;

200

Corrosion protection anode means;

210

Anode material;

220

Through channel;

230

Support means;

235

External thread;

240

Through opening;

245

Inner thread;

250

Valve;

260

Sealing washer.

Claims (7)

A water tank (100), in particular a hot water tank, which has a feed point (150) for supplying water and a removal point (150) for removal and at which at least one anticorrosion anode device (200) is mounted, a passage channel (220) being formed through the anticorrosive anode device (200) ), which in the mounted state of the anticorrosive anode device leads from the interior of the water container to the outside, characterized in that the passage channel is guided by the anode material and is designed as a vent channel for discharging left over air from the water tank. Water tank, the anti-corrosion anode device (200) is mounted at the top of the hot water tank. Water tank according to claim 1 or 2, characterized in that the corrosion protection anode device is mounted by means of a mounting device (230) on the water tank, wherein in the mounting means with the passageway (220) communicating passage opening (240) is formed, in which a valve or a tubular or tubular conduit is inserted. A water container according to claim 3, wherein said support means (230) comprises a Screw connection means is and / or the passage opening (240) is a bore with a cut internal thread. An anticorrosive anode device (200) having a through channel (220), wherein the through channel is aligned to guide the anticorrosive anode device to a water container (100) from the interior of the water container to the outside and wherein the through channel (220) is passed through the anode material (210) and is provided as a vent passage for discharging remaining air from the water tank. Corrosion protection anode device according to claim 5, characterized in that the anticorrosive anode device has a mounting means (230) for mounting on the water tank, wherein in the mounting means a standing with the passage passage in communication passage (240) is formed, for admitting a valve (250) or a hose - or pipe-like line or in which already a valve (250) or a tubular or tubular conduit is inserted. Anti-corrosion anode device according to claim 6, wherein the mounting device (230) is a screw connection device and / or the passage opening (240) is a bore with a cut internal thread.

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