EP3819542A1 - Heating device with a safe exhaust gas measuring opening - Google Patents

Abstract

The invention relates to a heating device (1) for a building, comprising an air supply line (2), an exhaust gas line (3) and an exhaust gas measurement opening (5) which can be resealable with a closure element (4) and can be connected to the exhaust gas line (3). With the closure element (4) removed, the exhaust gas measurement opening (5) is fluidically connected to the air supply line (2), with a measurement channel (6) extending from the exhaust gas measurement opening (5) to the exhaust gas line (3), characterized by at least one blocking element ( 8), wherein at least:- the measuring channel (6) is fluidically connected to the air supply line (2) via a lateral channel opening (7) and the blocking element (8) is arranged between the channel opening (7) and the exhaust gas measuring opening (5); or - the blocking element (8) is arranged in the region of the opening of the measuring channel (6) into the exhaust pipe (3).

Description

The invention relates to a heating device for a building, a closure element for the heating device and a connection element for the heating device. In particular, a heater with an exhaust gas measurement opening that is as safe as possible is specified.

There are heating devices for buildings known whose exhaust systems are equipped with closable measuring openings for fresh air and exhaust gas measurement. According to the state of the art, both measuring openings are sealed with manually screwed-on caps. If the skilled tradesman or chimney sweep forgets to screw the cover back on after measuring the exhaust gas values with a measuring probe, there is a risk that exhaust gases will enter the installation room through the open measurement opening and accumulate there if there is insufficient room ventilation.

From the EP 3 396 246 A1 a measuring point system with the features of the preamble of claim 1 is known. In the system of EP 3 396 246 A1 there is a risk that exhaust gas can unintentionally reach the exhaust gas measurement opening.

From the DE 33 33 472 A1 an air-exhaust chimney is known which has several cleaning openings that can be closed with sliding flaps. Corresponding cleaning openings are usually unsuitable for reliable exhaust gas measurements. In addition, sliding flaps usually require a considerable amount of installation space, which is not available for measuring channel openings.

It is therefore the object of the invention to provide a heating device which at least partially solves the problems described with reference to the prior art and in particular allows the highest possible operational reliability. In particular, an unwanted escape of exhaust gas from the exhaust gas measurement opening of the heater should be avoided as far as possible.

• der Messkanal über eine seitliche Kanalöffnung mit der Luftzufuhrleitung fluidisch verbunden ist und das Sperrelement zwischen der Kanalöffnung und der Abgasmessöffnung angeordnet ist; oder
• das Sperrelement im Bereich der Mündung des Messkanals in die Abgasleitung angeordnet ist.

These objects are achieved according to the features of claim 1 in that, when the closure element is removed, the exhaust gas measuring opening is fluidically connected to the air supply line of the heater, a measuring channel extending from the exhaust gas measuring opening to the exhaust gas line and at least one blocking element being provided, at least :

• the measuring channel is fluidically connected to the air supply line via a lateral channel opening and the blocking element is arranged between the channel opening and the exhaust gas measuring opening; or
• the blocking element is arranged in the region of the mouth of the measuring channel in the exhaust pipe.

Advantageous configurations result from the features of the dependent claims.

The inventive connection of the exhaust gas measuring opening and air supply line with the closure element removed ensures that no exhaust gas can enter the installation space even if the closure element is missing, in particular since the exhaust gas is sucked in and / or entrained by the air flow in the air supply line before it exits the exhaust gas measuring opening. This makes it possible in a particularly advantageous manner to provide an exhaust gas measuring opening that is as safe as possible. The blocking element can also help to further reduce the amount of exhaust gas escaping into the fresh air area if the closing element is forgotten.

Contributing to this is a heating device for a building, comprising an air supply line, an exhaust gas line and an exhaust gas measuring opening which can be reclosed with a closure element and which can be (fluidically) connected to the exhaust gas line, with the exhaust gas measuring opening being fluidically connected to the air supply line when the closure element is removed, starting from the exhaust gas measuring opening a measuring channel extends to the exhaust gas line and at least one blocking element (in addition to the closure element) is provided (or attached) (in and / or on the measuring channel), at least the measuring channel being fluidically connected to the air supply line via a lateral channel opening and the blocking element is arranged between the duct opening and the exhaust gas measuring opening; or the blocking element is arranged in the region of the opening of the measuring channel into the exhaust pipe.

In other words, this means in particular that the exhaust gas measurement area, which is currently or in the case of heating devices built according to the state of the art, is partially opened here, so that the exhaust gases escaping when the cover is forgotten are entrained by the fresh air flow in a recirculation. In this context, it is particularly advantageous if, as a further structural measure, the contour of the cover (closure element) for the exhaust gas measurement opening is (re) designed in such a way that, in the assembled state, it not only closes and seals the measurement opening but also this partial opening.

The heater is generally used to heat a building, such as a residential building, and / or in particular to heat a water supply system, such as a water circuit in the residential building. The heater is usually a gas heater. In other words, this relates in particular to a heating device which is set up to burn one or more gases, possibly with the supply of ambient air from a building, in order to generate energy for heating, for example, water for use in an apartment.

For example, the heater can be a so-called gas condensing boiler. The heater generally has at least one burner (with a combustion chamber) and a delivery device, such as a fan, which delivers a mixture of fuel (gas) and combustion air (through a mixture duct of the heater) to the burner. The exhaust gas resulting from the combustion can then be routed through an internal exhaust pipe of the heater to an external exhaust system (of a house). One or more heaters are connected to this exhaust system.

The heater can have a connection element by means of which the heater can be connected to an external exhaust pipe (the exhaust system) and / or an external air supply pipe. Instead of an external air supply pipe, it is also conceivable that the air supply line is connected to the installation space of the heater or opens into it, so that in particular ambient air can be drawn in from the vicinity of the heater or from the building via the air supply line.

The connection element can (in this case) be designed in the manner of a plate, a plate or a disk and / or as an attachment for the heater. At an (upper) end face of the connection element, this can be connectable to the external exhaust gas pipe and / or the external air supply pipe. In this context, it is also conceivable that the connection element has at least one opening in the (upper) end face through which ambient air can flow into the air supply line. On an opposite (lower) end face, the connection element can be connectable to the corresponding inner connections and / or functional elements of the heater.

The components air supply line, exhaust gas line and exhaust gas measuring opening can be integrated into the connection element. In other words, this means in particular that the air supply line, the exhaust gas line and the exhaust gas measuring opening are integral or in one piece can be formed and can jointly form the connection element. Accordingly, the connection element can be formed in one piece, preferably as a plastic component.

In other words, the fact that when the closure element is removed the exhaust gas measuring opening is fluidically connected to the air supply line means in particular that a fluid flow can be generated from the exhaust gas measuring opening or along the exhaust gas measuring opening to the air supply line, (at least) if the closing element is not present. In particular, the exhaust gas measurement opening and the air supply line can be fluidically connected to one another in such a way that, due to the air supply flow through the air supply line, suction can be generated in the area or at the exhaust gas measurement opening. This suction can also be generated in front of the exhaust gas measuring opening, for example in a measuring channel leading from the exhaust gas line to the exhaust gas measuring opening, in particular with the aim that an exhaust gas flow does not even reach the exhaust gas measuring opening, but can be sucked off by the air supply flow beforehand.

According to the invention, it is proposed that, starting from the exhaust gas measurement opening, a measurement channel extends to the exhaust gas line. The measuring channel usually opens into the exhaust pipe, in particular in the wall forming the exhaust pipe. The measuring channel can extend in a radial direction in relation to the axial direction of the exhaust pipe or at an angle to the direction of the exhaust pipe. The measuring channel usually has a diameter that is (just) large enough so that a measuring probe can be guided through the measuring channel into the exhaust pipe.

According to an advantageous embodiment, it is proposed that the air supply line at least partially surround the exhaust gas line and that the measuring channel extends at least partially through the air supply line. The air supply line can be arranged at least in sections coaxially around the exhaust gas line. The measuring channel can penetrate the air supply line in particular in a radial direction (from the outside to the inside).

According to a further advantageous embodiment, it is proposed that the measuring channel be fluidically connected to the air supply line when the closure element is removed. In other words, this means in particular that in this case the connection of the measuring opening and the air supply line is realized via the measuring channel. In this context, the measuring opening is usually formed with the end of the measuring channel pointing (radially) outward.

The measuring channel can be fluidically connected to the air supply line via a lateral channel opening. The channel opening can in particular completely interrupt the channel wall (in the axial direction of the channel or in the channel course direction) or in particular partially (in the radial direction of the channel or at an angle to the channel course direction). In particular, the lateral channel opening can be formed with a hole or slot in the channel wall.

In this context, a blocking element can be arranged between the (lateral) duct opening and the exhaust gas measuring opening. This advantageously contributes to reducing the risk of exhaust gas reaching the exhaust gas measuring opening even further.

Alternatively or cumulatively, a blocking element can be arranged in the region of the opening of the measuring channel into the exhaust gas line. This advantageously helps to reduce the amount of exhaust gas that can unintentionally get into the measuring channel.

The blocking element can be a flap, for example. In particular, the flap closes automatically, for example due to gravity and / or due to a spring load. The flap can be designed, for example, so that it can (only) be opened by inserting the measuring lance and automatically returns to the closed position after the measuring lance has been removed.

As an alternative or in addition to a flap, a membrane can be provided as a blocking element. The membrane can have one or more (in particular cross-shaped or X-shaped) arranged slots. This can help to ensure that the membrane can close again as completely as possible after the measuring probe has pierced the membrane.

Furthermore, a screen can also be used as a blocking element. This can for example be designed in the manner of a two-component flap. For this purpose, the screen can be produced using a two-component injection molding process. The screen can be formed (partially or predominantly) with a hard material (for example a thermoplastic) and (predominantly or partially) with a soft material (for example an elastomer). As a result, the diaphragm can act in a similar way to the slotted membrane described above.

Of course, two of the blocking elements can also be provided, preferably one of them between the (lateral) duct opening and the exhaust gas measuring opening and another of them in the region of the opening of the measuring duct into the exhaust gas line. The two locking elements can be designed in the same way or differently.

According to a further aspect, a closure element is proposed for a heater described here, the closure element being set up in such a way that it can reversibly close the exhaust gas measuring opening and at the same time reversibly interrupt a fluidic connection between the exhaust gas measuring opening and the air supply line.

According to an advantageous embodiment, it is proposed that the closure element have a mandrel which, in the assembled state, extends at least partially through the measuring channel. The mandrel usually has an essentially constant outer diameter that is smaller than the inner diameter of the measuring channel. The thorn can have an outer diameter that is in particular a maximum of 20% or even a maximum of 10% smaller than the inner diameter of the measuring channel. As a rule, the mandrel has a sufficient length so that in the assembled state it covers or covers the lateral channel opening (in its longitudinal direction, which corresponds to the axial direction of the measuring channel or the direction of the measuring channel course).

The mandrel can extend away from the cover part starting from a cover part of the closure element. The cover part can describe a head part of the closure element formed in the manner of a cover for the exhaust gas measurement opening. The cover part can have connecting means, such as a thread, via which the closure element (detachably) can be (mechanically) connected to the connection element and / or the exhaust gas measurement opening.

According to a further advantageous embodiment, it is proposed that the mandrel has at least one seal which, in the assembled state, seals the exhaust line from the exhaust gas measuring opening and / or the exhaust line from the exhaust gas measuring opening and the duct opening. At least two circumferential seals, such as, for example, O-ring seals, are preferably arranged on the mandrel. At least a first of these seals can be arranged, for example, in such a way that, in the assembled state, it lies in the region of the opening of the measuring channel in the exhaust gas line. At least one second of these seals can be arranged, for example, in such a way that, in the assembled state, it lies between the (lateral) duct opening and the exhaust gas measuring opening.

The seals can be dimensioned in such a way that they rest against the inner surface of the channel wall of the measuring channel in the assembled state. In particular, all the seals provided are in the assembled state on the inner surface of the channel wall of the measuring channel.

According to a further aspect, a connection element for a heater described here is proposed, comprising an air supply line, an exhaust gas line and an exhaust gas measuring opening which can be reclosed with a closure element and which can be (fluidically) connected to the exhaust gas line, with the exhaust gas measuring opening being fluidically connected to the air supply line when the closure element is removed , a measuring channel (of the connection element) extending from the exhaust gas measurement opening to the exhaust gas line and at least one blocking element (of the connection element) being provided, at least the measuring channel being fluidically connected to the air supply line via a lateral channel opening and the blocking element between the channel opening and the exhaust gas measuring port is arranged; or the blocking element is arranged in the region of the opening of the measuring channel into the exhaust pipe.

The details, features and advantageous configurations discussed in connection with the heating device can correspondingly also occur in the case of the closure element and / or the connection element presented here, and vice versa. In this respect, reference is made in full to the statements made there for a more detailed characterization of the features.

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

Figur 1:

ein Heizgerät in perspektivischer Ansicht,

Figur 2:

ein Anschlusselement für das Heizgerät aus Figur 1 in Draufsicht,

Figur 3:

eine Detailansicht des Anschlusselements aus Figur 2 in Schnittansicht,

Figur 4:

die Ansicht aus Figur 3 ohne Verschlusselement,

Figur 5:

ein weiteres Anschlusselement in Schnittansicht,

Figur 6:

das Anschlusselement aus Figur 5 mit eingesetztem Verschlusselement,

Figur 7:

das Anschlusselement aus Figur 5 mit eingeführter Messlanze,

Figur 8:

eine Detailansicht eines weiteren Anschlusselements in Schnittansicht,

Figur 9:

eine Detailansicht eines weiteren Anschlusselements in Schnittansicht,

Figur 10:

ein Verschlusselement in perspektivischer Ansicht,

Figur 11:

eine Detailansicht eines weiteren Anschlusselements in Schnittansicht, und

Figur 12:

die Ansicht aus Figur 11 ohne Verschlusselement.

They represent:

Figure 1:

a heater in perspective view,

Figure 2:

a connection element for the heater Figure 1 in plan view,

Figure 3:

a detailed view of the connection element Figure 2 in sectional view,

Figure 4:

the view Figure 3 without locking element,

Figure 5:

a further connection element in sectional view,

Figure 6:

the connection element Figure 5 with inserted locking element,

Figure 7:

the connection element Figure 5 with inserted measuring probe,

Figure 8:

a detailed view of a further connection element in sectional view,

Figure 9:

a detailed view of a further connection element in sectional view,

Figure 10:

a closure element in perspective view,

Figure 11:

a detailed view of a further connection element in sectional view, and

Figure 12:

the view Figure 11 without closure element.

Figure 1 shows a heating device 1 for a building. The heater 1 has a connection element 11 for connecting the heater 1 to an external exhaust pipe (not shown here).

Figure 2 shows a corresponding connection element 11 for the heater 1. In the top view shown, it can be seen that an air supply line 2 and an exhaust gas line 3 are formed in the connecting element 11, the air supply line 2 being arranged here coaxially around the exhaust gas line 3, for example. One end of an external exhaust pipe can be inserted into the exhaust pipe 3.

Furthermore, the connection element 11 has an exhaust gas measuring opening 5 which can be reclosed with a closure element 4 and which is connected to the exhaust gas line 3. The exhaust gas measuring opening 5 and the exhaust gas line 3 are connected to one another here via a measuring channel 6.

Figure 3 shows a detailed view of the connection element 11 in a sectional illustration. The air supply flow 12 through the air supply line 2 and the exhaust gas flow 13 through the exhaust gas line 3 in FIG Figure 3 a mounted state of the closure element 4 is shown in that the exhaust gas measurement opening 5 is closed with the closure element 4. With the closure element 4 removed (cf. Figure 4 ) the exhaust gas measuring opening 5 is connected to the exhaust gas line 3.

Figure 4 shows a corresponding view without the closure element 4. The heater 1 proposed here (not shown here; cf. Figure 1 ) and the connection element 11 proposed here are characterized in that, when the closure element 4 is removed, the exhaust gas measuring opening 5 is fluidically connected to the air supply line 2. As a result, part of the exhaust gas flow 13 which flows into the measuring channel 6 can be sucked in and entrained by the air supply flow 12 before it reaches the exhaust gas measuring opening 5.

The sectional view according to Figures 3 and 4 shows an advantageous embodiment variant in which a measuring channel 6 extends from the exhaust gas measuring opening 5 to the exhaust gas line 3 and in which the measuring channel 6 (and via this also the exhaust gas measuring opening 5) is fluidically connected to the air supply line 2 via a lateral channel opening 7 is. The channel opening 7 is in the embodiment according to Figures 3 and 4 formed, for example, in the manner of a partial opening in the channel wall of the measuring channel 6.

It can also be seen that the air supply line 2 at least partially (coaxially) surrounds the exhaust gas line 3 and the measuring channel 6 extends at least partially through the air supply line 2. In addition, especially in Figure 4 It can be seen that the measuring channel 6 is connected to the air supply line 2 with the closure element 4 removed, namely, for example, via the lateral channel opening 7.

Figure 5 shows a further exemplary connection element 11 in sectional view. The reference symbols are used uniformly so that reference can be made to the preceding explanations. In Figure 5 it is illustrated by way of example that a blocking element 8 can be arranged, for example, as in the area of the mouth of the measuring channel 6 in the exhaust gas line 3. With the locking element 8 according to Figure 5 it is, for example, a flap that can close automatically due to gravity.

In addition, in Figure 5 exemplarily illustrates that the channel opening 7 can also be formed at least in sections in the manner of an interruption in the channel wall of the measuring channel 6.

Figure 6 shows the connection element 11 from Figure 5 with the closure element 4 inserted. The length of the closure element 4 (in particular its mandrel) is dimensioned such that the closure element 4 cannot open the flap.

Figure 7 shows the connection element 11 from Figure 5 with introduced measuring lance 14. This illustrates that and how a measuring lance 14 introduced through the measuring channel 6 into the exhaust gas line 3 can open the blocking element 8, which is embodied as a flap, for example.

Figure 8 illustrates a further exemplary blocking element 8 in the region of the opening of the measuring channel 6 into the exhaust gas line 3. Here, instead of a flap, a slotted membrane is shown as the blocking element 8.

Figure 9 illustrates a further exemplary blocking element 8 in the region of the opening of the measuring channel 6 into the exhaust gas line 3. Here, a two-component screen is shown as a blocking element 8 by way of example.

The ones in the Figures 7 to 9 The illustrated, exemplary locking element 8 can help to further reduce the amount of exhaust gas escaping into the fresh air area if the locking element 4 is forgotten. For this purpose, according to the exemplary representations according to the Figures 7 to 9 A barrier can be provided between the two flow areas 2, 3, which only opens when the measuring lance 14 is introduced in the direction of the exhaust gas flow 13.

Figure 10 shows a closure element 4 for a heater 1 described here or for a connection element 11 described here. The closure element 4 is set up in such a way that it can reversibly close the exhaust gas measuring opening 5 and at the same time reversibly interrupt a fluidic connection between the exhaust gas measuring opening 5 and the air supply line 2.

For example, the closure element 4 has a mandrel 9 for this purpose, which in the assembled state extends at least partially through the measuring channel 6. The mandrel 9 covers the duct opening 7. Furthermore, the mandrel 9 has a plurality of seals 10 which, in the assembled state, seal off the exhaust gas line 3 from the exhaust gas measuring opening 5 and from the duct opening 7.

Figure 11 shows a further exemplary connection element 11 in sectional view. In Figure 5 is exemplarily illustrated that and, for example, how between the duct opening 7 and the exhaust gas measuring opening 5, a blocking element 8 can be arranged. This blocking element 8 is designed here as an example of a slotted membrane. In the Figure 11 The illustrated arrangement of the blocking element 8 can help prevent an exhaust gas / air mixture from escaping from the measurement opening 5.

Thus, a heater and a connection element with the safest possible exhaust gas measurement opening are described.

List of reference symbols

1

heater

2

Air supply line

3

Exhaust pipe

4th

Closure element

5

Exhaust gas measurement port

6th

Measuring channel

7th

Channel opening

8th

Locking element

9

mandrel

10

poetry

11

Connection element

12th

Air supply flow

13th

Exhaust gas flow

14th

Measuring probe

Claims (15)

A heating device (1) for a building, comprising an air supply line (2), an exhaust line (3) and an exhaust gas measuring opening (5) which can be reclosed with a closure element (4) and which can be connected to the exhaust line (3), with the closure element (4) being removed ) the exhaust gas measuring opening (5) is fluidically connected to the air supply line (2), a measuring channel (6) extending from the exhaust gas measuring opening (5) to the exhaust gas line (3), characterized by at least one blocking element (8), wherein at least: - The measuring channel (6) is fluidically connected to the air supply line (2) via a lateral channel opening (7) and the blocking element (8) is arranged between the channel opening (7) and the exhaust gas measuring opening (5); or - The blocking element (8) is arranged in the region of the mouth of the measuring channel (6) in the exhaust pipe (3). Heater (1) according to claim 1, wherein the air supply line (2) at least partially surrounds the exhaust gas line (3) and the measuring channel (6) extends at least partially through the air supply line (2). Heater (1) according to Claim 1 or 2, the measuring channel (6) being fluidically connected to the air supply line (2) when the closure element (4) is removed. Heater (1) according to one of the preceding claims, wherein the at least one blocking element (8) comprises a flap. Heater (1) according to claim 4, wherein the flap closes automatically. Heater (1) according to Claim 4 or 5, the flap being designed in such a way that it can be opened by inserting a measuring lance (14) and automatically returns to the closed position after the measuring lance (14) has been removed. Heater (1) according to one of claims 1 to 3, wherein the at least one blocking element (8) comprises a membrane. Heater (1) according to claim 7, wherein the membrane has one or more slits. Heater (1) according to one of claims 1 to 3, wherein the at least one blocking element (8) comprises a screen. Heater (1) according to claim 9, wherein the screen is designed as a two-component flap. Heater (1) according to one of the preceding claims, wherein two locking elements (8) are provided, one of the locking elements (8) between the lateral duct opening (7) and the exhaust gas measuring opening (5) and another of the Blocking elements (8) is arranged in the region of the mouth of the measuring channel (6) in the exhaust pipe (3). Closure element (4) for a heating device (1) according to one of the preceding claims, wherein the closure element (4) is set up in such a way that it reversibly closes the exhaust gas measuring opening (5) and at the same time provides a fluidic connection between the exhaust gas measuring opening (5) and the air supply line (2). can interrupt reversibly. Closure element (4) according to claim 12, wherein the closure element (4) has a mandrel (9) which, in the assembled state, extends at least partially through the measuring channel (6). Closure element (4) according to claim 13, wherein the mandrel (9) has at least one seal (10) which, in the assembled state, separates the exhaust gas line (3) from the exhaust gas measuring opening (5) and / or the exhaust gas line (3) from the exhaust gas measuring opening (5) ) and the channel opening (7) seals. Connection element (11) for a heater (1) according to one of Claims 1 to 11, comprising an air supply line (2), an exhaust line (3) and an exhaust gas measuring opening (5) which can be closed with a closure element (4) and which connects to the exhaust gas line (3 ) can be connected, with the exhaust gas measuring opening (5) being fluidically connected to the air supply line (2) when the closure element (4) is removed, a measuring channel (6) extending from the exhaust gas measuring opening (5) to the exhaust gas line (3), characterized by at least one locking element (8), wherein at least: - The measuring channel (6) is fluidically connected to the air supply line (2) via a lateral channel opening (7) and the blocking element (8) is arranged between the channel opening (7) and the exhaust gas measuring opening (5); or - The blocking element (8) is arranged in the region of the mouth of the measuring channel (6) in the exhaust pipe (3).

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