EP3396246B1 - Exhaust gas system with measurement site system - Google Patents

Description

The invention is directed to an exhaust system with a boiler connection piece comprising a measuring point system with an external line component which has at least one external line component measurement opening and an internal line component which is at least partially surrounded by the external line component and which extends at least one on the outside from the internal line component in the direction of the external line component measurement opening and has a connection to the inside of the inner line component producing measuring stub with an inner line component measuring opening formed at the end, at least one closure element being detachably attached to the outer line component and the at least one outer line component measuring opening being designed to close.

For the air-exhaust operation of modern heat generators, in particular of condensing or low-temperature devices, double-walled pipe systems or pipe systems are increasingly being used, on the one hand to safely discharge the exhaust gas produced during combustion and, on the other hand, to supply the supply air required for combustion through a space-saving pipe system, with the supply air being preheated by the exhaust gas to save energy. Such known line systems consist of an outer line component and an inner line component surrounded concentrically by the outer line component, wherein the line components can be pipelines with a circular cross section. For exhaust gas measurement or for taking a sample of the exhaust gas, such An externally accessible measuring point is available to the pipeline systems.

From the WO 2014/159346 is an antiseptic cap that has a cap holder. The cap holder has an opening through which a Luer connector is inserted into the cap, which in turn is connected to an infusion line. The Luer connector is surrounded in sections by the cap holder. A tapered section extends from the Luer connector towards the bottom of the cap holder. The antiseptic cap has a cap which is arranged inside the cap holder and which comprises a threaded section which is screwed to the Luer connector.

A boiler connector for connecting boilers to a measuring point system of the type mentioned is, for example, from DE 100 53 067 C1 known. The measuring point system is designed on a boiler connection piece and has an internal exhaust gas line and an external air supply line arranged concentrically and at a distance from it. The exhaust pipe also has a pipe section designed as a measuring connector which extends radially from the outside of the exhaust pipe. The exhaust pipe is rigidly connected to the supply air pipe via radial webs and the measuring nozzle. The pipe section designed as a measuring nozzle is led outwards from the supply air line and closed by a plug. After removing the plug, a probe for taking smoke gas samples can be inserted into the exhaust pipe through the measuring nozzle.

In this known measuring point system, it is a great disadvantage if the plug for the pipe section leaks, because exhaust gas then escapes into the installation room of the exhaust system, which leads to an exhaust gas concentration in the installation room that is dangerous for people.

The invention is based on the object of creating a solution which, in a structurally simple manner, comprises an exhaust system with a boiler connection piece comprising a measuring point system which is inexpensive to manufacture and which also guarantees improved safety in the event of a leak in the plug or closure which closes an opening of a measuring port of an inner line component surrounded by an external line component.

In the case of an exhaust system with a boiler connection piece comprising a measuring point system of the type mentioned at the beginning, the object is achieved in that a gap is formed between the inner line component measuring opening and the outer line component, the at least one closure element having an elongated body which, when the at least one is attached Closure element on the outer line component extends at least in sections into the at least one measuring port and which both the at least one outer line component measuring opening and the at least one inner line component measuring opening is designed to be sealing. In the context of the invention, an arrangement of the outer line component and the inner line component is to be understood as meaning arrangements in which either angular channels or pipes with a circular cross section are arranged concentrically to one another, for example.

Advantageous and expedient refinements and developments of the invention emerge from the subclaims.

The invention provides an exhaust system with a boiler connection piece comprising a measuring point system which is characterized by a functionally appropriate construction and has a compact and cost-effective structure. With the measuring point system of the exhaust system according to the invention, a double security with regard to the tightness is achieved. This is because if the area of the elongated body which, when the closure element is attached to the external line component, extends at least in sections into the measuring nozzle and is intended to seal the internal line component measuring opening, should leak, For example, an exhaust gas flowing through the inner line component can only flow into the outer line component, but never from the outer line component into the external environment, such as a closed installation room for an exhaust system, because the closure element provides double security by sealing both the outer line component measurement opening and the If there is actually a leak at the inner line component measuring opening, so that exhaust gas flows into the outer line component, the exhaust system will display a fault message due to the supply air laden with exhaust gas, but there will be no exhaust gas escaping into the installation room. Rather, as a result of the fault message, the tightness of the inner line component measuring opening can be checked and restored without a situation that is dangerous for people due to an increased exhaust gas concentration in the installation room.

In one embodiment, the invention provides that the at least one measuring port ends at a predetermined distance from the at least one external line component measuring opening. Despite the existing gap between the inner line component measuring opening and the outer line component, the measuring nozzle could extend into the outer line component measuring opening - however, the design so that the measuring nozzle ends at a predetermined distance from the outer line component measuring opening ensures that there is a sufficient gap in every case that in the event of a leak in the inner line component measuring opening through the inner line component flowing fluid, such as exhaust gas, flows into the outer conduit component.

To increase the sealing effect on the inner line component measuring opening, the invention provides in a further embodiment that a sealing section is formed on a first longitudinal end of the elongated body of the at least one closure element, which is arranged within the at least one measuring connector when the at least one closure element is attached to the outer line component and on which at least one sealing lip which extends around the elongate body and protrudes therefrom is integrally formed and which is designed to be elastically deformable. It is also possible for more than one sealing lip to be formed on the elongated body, the elongated body with the section with the at least one sealing lip being pressed into the measuring nozzle in a sealing manner. The elongated body of the at least one closure element therefore does not have to be adapted very precisely to the cross section of the measuring port, so that the elongated body can be produced with generous tolerances, because the at least one sealing lip ensures the sealing effect. As a result, the elongated body together with the at least one sealing lip has a larger cross section than the measuring nozzle.

For easy assembly and disassembly of the closure element, the invention provides in an embodiment that a head section for handling the at least one closure element is formed at a second longitudinal end of the elongated body of the at least one closure element, which has a larger cross-section than the elongated body. The closure element, which has to be tightened like a screw for attachment to the external line component, can be turned either by hand or with the aid of a coin or an Allen key if the head section is designed accordingly.

To seal the outer line component measuring opening, it is advantageous if at least one sealing lip element is formed on the elongated body of the at least one closure element between the sealing section and the head section, which encircles the elongated body and is elastically formed, which when the at least one closure element is attached to the outer line component on the Outside of the external line component which seals off at least one external line component measuring opening. The sealing lip element consequently seals off the area between the elongated body of the at least one closure element and the outer line component opening.

In a further embodiment, the invention provides that the at least one closure element can be releasably fixed to the external line component with the aid of a locking mechanism, with the at least one closure element from an open position in which the closure element from the at least an external line component measuring opening can be pulled out into a locking position in which a movement of the at least one closure element out of the at least one external line component measuring opening is blocked with the aid of the locking mechanism. According to the development, there are defined positions for the closure element, so that when a corresponding marking is applied in an area of the closure element that is visible from the outside, it can be recognized immediately whether the closure element is in a locked and secured position for sealing the system.

A structurally simple possibility for secure locking and thus sealing can be implemented in an embodiment of the invention in that the locking mechanism has at least one locking attachment which is formed on the elongated body of the at least one closure element, the at least one locking projection in the locking position of the at least one closure element being arranged to reach behind the edge of the at least one external line component measuring opening, whereas the at least one locking projection in the opening position of the at least one closure element is in alignment with an enlarged one Area of the at least one external line component measuring opening is arranged. In this case, the closure element can only be pulled out of the external line component measurement opening of the external line component in the open position, which reduces the loss of the closure element when it is dismantled for measurement purposes.

To securely fix the closure element so that it does not move from its locking position back into the open position in the event of vibrations, an embodiment of the invention provides that the at least one locking attachment of the at least one closure element has a rising tightening surface and a sloping holding surface that adjoins the rising tightening surface and that a blocking attachment is formed on the at least one external line component measuring opening on the inside of the external line component, wherein in the locking position of the at least one closure element the sloping holding surface rests against the blocking attachment and the blocking attachment blocks a movement of the at least one closure element in the direction of the opening position.

In order that a movement of the closure element from the open position into the locking position can be felt by the operator, the invention provides in a further embodiment that, in order to fix the at least one closure element on the external line component, when the at least one closure element is moved from the open position into the locking position, the increasing Suit area over the Blocking approach moved away and the blocking approach thereby pushes the at least one closure element in the direction of the inner line component. Consequently, an increased force has to be applied in order to move the closure element from the open position into the locking position. In addition, the rising tightening surface ensures that the closure element is moved in the direction of the inner line component, whereby the sealing effect is increased.

In a further embodiment, the invention provides that two locking lugs are formed on the elongated body of the at least one closure element, which are formed diametrically to one another on the elongated body. The second locking projection can also engage behind the edge of the at least one external line component measurement opening in the locking position of the closure element, so that the closure element is secured very securely by means of a form-fitting connection to move away from the measurement port.

Finally, in a further embodiment, the invention provides that a stop area is formed on the at least one external line component measuring opening, against which one of the two locking lugs rests in the locking position of the at least one closure element. In this way, the end position of the closure element is defined in the locking position, thus ensuring that the closure element is actually positioned in its locking position and not in a position beyond it.

It goes without saying that the features mentioned above and still to be explained below can be used not only in the respectively specified combination, but also in other combinations or on their own, without departing from the scope of the present invention. The scope of the invention is defined only by the claims.

• Figur 1 ein Messstellen-System der erfindungsgemäßen Abgasanlage gemäß einem ersten Ausführungsbeispiel,
• Figur 2 eine perspektivische Einzelteildarstellung des Messstellen-Systems aus Figur 1,
• Figur 3 eine seitliche Schnittansicht des Messstellen-Systems aus Figur 1,
• Figur 4 eine vergrößerte Detailansicht aus Figur 3,
• Figur 5 eine wie in Figur 4 gezeigte Darstellung, bei welcher auf eine Abbildung von Verschlusselementen verzichtet wurde,
• Figur 6 eine Rückansicht auf das Messstellen-System aus Figur 1, wobei auch hier auf eine Darstellung von Verschlusselementen verzichtet wurde,
• Figur 7 eine perspektivische Darstellung eines Verschlusselements,
• Figur 8 eine weitere perspektivische Ansicht auf das Verschlusselement aus Figur 7,
• Figur 9 eine Seitenansicht auf das in Figur 7 gezeigte Verschlusselement,
• Figur 10 eine Draufsicht auf das in Figur 7 gezeigte Verschlusselement,
• Figur 11 eine seitliche Schnittansicht des in Figur 7 gezeigten Verschlusselements,
• Figur 12 eine weitere seitliche Schnittansicht des in Figur 7 gezeigten Verschlusselements, wobei es sich im Vergleich zu Figur 11 um einen um 90° gedrehten Schnitt handelt,
• Figur 13 das Messstellen-System der erfindungsgemäßen Abgasanlage gemäß einem zweiten Ausführungsbeispiel,
• Figur 14 eine perspektivische Schnittdarstellung des Messstellen-Systems aus Figur 13,
• Figur 15 eine Detail-Schnittansicht von zwei Messstellen des Messstellen-Systems der erfindungsgemäßen Abgasanlage,
• Figur 16 eine weitere Detail-Schnittansicht von einer Messstelle des Messstellen-Systems der erfindungsgemäßen Abgasanlage,
• Figur 17 eine noch weitere Detail-Ansicht einer Messstelle des Messstellen-Systems,
• Figur 18 eine Ansicht auf eine Außenleitungsbauteilmessöffnung des Messstellen-Systems, und
• Figur 19 eine Detail-Ansicht auf ein Verschlusselement in Öffnungsstellung.

Further details, features and advantages of the subject matter of the invention emerge from the following description in connection with the drawing, in which exemplary preferred embodiments of the invention are shown. In the drawing shows:

• Figure 1 a measuring point system of the exhaust system according to the invention according to a first embodiment,
• Figure 2 a perspective view of individual parts of the measuring point system Figure 1 ,
• Figure 3 a side sectional view of the measuring point system Figure 1 ,
• Figure 4 an enlarged detailed view Figure 3 ,
• Figure 5 one like in Figure 4 The illustration shown, in which the closure elements are not shown,
• Figure 6 a rear view of the measuring point system Figure 1 , whereby here, too, closure elements are not shown,
• Figure 7 a perspective view of a closure element,
• Figure 8 a further perspective view of the closure element Figure 7 ,
• Figure 9 a side view of the in Figure 7 shown closure element,
• Figure 10 a top view of the in Figure 7 shown closure element,
• Figure 11 a side sectional view of the in Figure 7 shown closure element,
• Figure 12 a further sectional side view of the in Figure 7 shown closure element, where it is compared to Figure 11 is a cut rotated by 90 °,
• Figure 13 the measuring point system of the exhaust system according to the invention according to a second embodiment,
• Figure 14 a perspective sectional view of the measuring point system Figure 13 ,
• Figure 15 a detailed sectional view of two measuring points of the measuring point system of the exhaust system according to the invention,
• Figure 16 a further detailed sectional view of a measuring point of the measuring point system of the exhaust system according to the invention,
• Figure 17 another detailed view of a measuring point of the measuring point system,
• Figure 18 a view of an external line component measuring opening of the measuring point system, and
• Figure 19 a detailed view of a closure element in the open position.

In the Figures 1 to 19 two exemplary embodiments of a measuring point system of the exhaust gas system 1 according to the invention are shown, the Figures 1 to 6 to a first embodiment and the Figures 13 to 15 refer to a second exemplary embodiment of the measuring point system 1. In the Figures 7 to 12 a closure element 2 is shown in various representations, which is identical for both exemplary embodiments of the measuring point system 1 and is used in both exemplary embodiments. the Figures 16 to 19 show the attachment of the closure element 2 to an external line component 3 of the measuring point system 1, which is also valid for both exemplary embodiments.

The two exemplary embodiments of the measuring point system 1 of the exhaust system according to the invention differ only in the number of measuring points present, so that the following description applies to both exemplary embodiments.

The measuring point system 1 of the exhaust system according to the invention has the external line component 3 and an internal line component 4 which is surrounded by the external line component 3. The inner line component 4 is partially surrounded by the outer line component 3, like the Figures 1 , 3 , 13 and 14 show for both embodiments. With these In embodiments, a pipe section of the inner line component 4 protrudes from the outer line component 3, it also being conceivable that the outer line component 3 completely surrounds the inner line component 4. The measuring point system 1 shown in the figures is intended for a boiler connection piece for exhaust systems, with concentric pipe bends in the exemplary embodiments shown. However, the invention is not limited to this application, but can also be used wherever measurements or sampling of two fluid flows are desired, which flow on the one hand through the inner line component 4 and on the other hand through the outer line component 3, the inner line component 4 and the External line component 3 define a double-walled line system.

Like comparing the Figures 1 and 13th shows, the measuring point system 1 of the first exemplary embodiment has two measuring points 5a and 5b, whereas in the second exemplary embodiment four measuring points 5 are provided (see FIG Figure 14 ). In the exemplary embodiments, the measuring points 5a are provided for taking a sample of a fluid flowing through the inner line component 4, whereas the measuring point 5b is intended for taking a sample of a fluid which flows in the space formed between the outer line component 3 and the inner line component 4 . In the specific case of an exhaust system, the measuring points 5a are used to measure the exhaust gas flowing for the inner line component 4 and the measuring points 5b are used to measure the supply air flowing between the inner line component 4 and the outer line component 3.

To measure or take samples of the fluid or exhaust gas flowing through the inner line component 4, a measuring connector 6 is provided, which extends from the outside of the inner line component 4 in the direction of the outer line component 3 and is formed at the end with an inner line component measuring opening 7 (see FIG Figure 2 or 16 ). the Inner line component measuring opening 7 establishes a connection to the interior 8 of the inner line component 4 via the measuring connector 6, so that, for example, a measuring probe used at the measuring point 5a can be guided via the measuring connector 6 into the interior 8 of the inner line component 4 for measurement. The measuring probe arrives at the measuring port 6 via an external line component opening 9 formed in the external line component 3. A further external line component measurement opening 9 is provided for measuring or taking samples of the fluid flowing between the external line component 3 and the internal line component 4, ie the supply air (see for example Figure 2 ).

In contrast to the first exemplary embodiment, in the second exemplary embodiment two measuring points 5a and 5b are provided for measuring exhaust gas and supply air, with the outer line component measuring openings 9 being identical for both measuring points 5a and 5b in both exemplary embodiments. In the two exemplary embodiments shown in the figures, the closure elements 2 for the measuring points 5a and 5b are also designed to be identical. A respective closure element 2 is detachably attached to the external line component 3 and closes the associated external line component measuring opening 9 in a sealing manner. A respective closure element 2 consequently seals the external line component measuring opening 9 assigned to it when it is inserted into the external line component measuring opening 9 and, if necessary, detachably fixed there, which will be discussed in more detail below. It goes without saying that the closure elements 2, like the external line component 3 and the internal line component 4, belong to the measuring point system 1 according to the two exemplary embodiments. For the sake of completeness, it should be mentioned that in Figure 2 furthermore a flange ring 29 serving for connection and a sealing ring 30 are shown.

The measuring connector 6 extends in the direction of the external line component measuring opening 9 and has the end Inner line component measuring opening 7. A respective closure element 2, which is used universally for sealing both measuring points 5a and 5b, but in particular for sealing a respective measuring point 5a, has an elongated body 10. This is because when the closure element 2 is attached to the respective measuring point 5a of the external line component 3, this elongated body 10 extends, at least in sections, into the measuring connector 6. When attached, the closure element 2 seals off the entire measuring point 5a according to the invention. This means that the closure element 2 seals both the outer line component measuring opening 9 and the inner line component measuring opening 7, for example from the Figures 3, 4 , 14, 15 and 16 can be seen for both exemplary embodiments. The closure element 2 is shown in detail for various views in FIGS Figures 7 to 12 shown. A sealing section 12 is formed at a first longitudinal end 11 of the elongated body 10 of a respective closure element 2 (see, for example, FIG Figures 9, 11 or 12 ). When the respective closure element 2 is attached to an assigned measuring point 5a, the sealing section 12 is arranged within the measuring port 6, as is the case with FIGS Figures 3, 4 , 14, 15 and 16 demonstrate. To seal off the measuring port 6, the sealing section 12 has a total of four sealing lips 14, which are offset circumferentially around the elongated body 10 in the longitudinal direction of the elongated body 10. Alternatively, only a single sealing lip 14 could be formed on the elongated body 10. The respective sealing lips 14 are designed to be elastically deformable, so that when the closure element 2 is inserted into the outer line component measuring opening 9 of the measuring point 5a, the sealing section 12 is inserted into the inner line component opening 7 of the measuring connector 6, which extends in alignment with the outer component measuring opening 9, and thereby the inner line component opening 7 seals. To improve the Handling the closure element 2 when it is mounted on or dismantled from the external line component 3, a respective closure element 2 has a head section 16 at a second longitudinal end 15 of the elongated body 10, which ensures simple manual handling of the closure element 2. The head section 16 has a larger cross section 17 compared to the elongated body 10. Furthermore, a sealing lip element 18 is integrally formed on the elongated body 10 of a respective closure element 2. The sealing lip element 18 is formed circumferentially around the elongated body 10 and is arranged between the sealing section 12 and the head section 16. Furthermore, the sealing lip element 18 is designed to be elastic and, when a respective closure element 2 is attached to the measuring points 5a and 5b, seals the respective external line component measuring opening 9. the Figures 11 and 12 show respective sectional views of the closure element, the sectional planes BB and CC from the top view Figure 10 emerge.

A respective closure element 2 is secured with the aid of a locking mechanism 19 (see for example Figure 15 ) releasably fixable on the external line component 3. Accordingly, the closure element 2 for detachable fixation on the external line component 3 is out of an open position (see, for example Figure 19 ), in which a respective closure element 2 can be removed from the measuring points 5a, 5b and pulled out of the associated external line component measuring opening 9, into a locking position (see for example Figure 15 ) movable, in which a movement of the respective closure element 2 out of the associated external construction line component measuring opening 9 is blocked with the aid of the locking mechanism 19. The movement of the respective closure element 2 between the open position and the locking position is a rotary movement, with the closure element 2 for assembly in a Outer component line opening 9 is inserted and pulled out of this for dismantling.

The locking mechanism 19 comprises two locking lugs 20a and 20b (see for example Figures 8, 11 and 15th ), which are formed on the elongated body 10 of a respective closure element 2. The two locking lugs 20a, 20b are formed diametrically to one another on the elongated body 10 and are arranged between the sealing lip element 18 and the sealing section 12 on the elongated body 10. Alternatively, it is also conceivable that only one locking projection is formed on the elongated body 10 of a respective closure element 2. This is because it is sufficient if only one of the locking lugs 20a, 20b engages behind the edge 21 of the associated external line component measuring opening 9 in the locking position of the respective closure element 2 (see, for example, FIG Figure 15 ). Furthermore, in the exemplary embodiments shown, one of the two locking lugs 20b serves to noticeably indicate to an operator that the locking position has been reached. This is because a stop region 23 is formed on a respective external line component measuring opening 9, against which one of the two locking lugs 20b rests in the locking position of a respective closure element 2, which is shown in FIG Figure 17 is shown, where in Figure 18 By omitting the closure element 2, the stop region 23 of the external line component measuring opening 9 can be seen. The respective external line component measuring openings 9 each have an enlarged area 22 (see, for example Figures 6 and 18th ), which is important for dismantling a respective closure element 2 or for taking samples. In the open position of a respective closure element 2, the two locking lugs 20a, 20b are arranged in alignment with the widened area of the respective external line component measuring opening 9, so that the Closure element 2 can be pulled out of the outer line component measuring opening 9.

According to the invention, a gap 24 is formed between the inner line component measuring opening 7 and the outer line component 3 when a respective closure element 2 is inserted into an assigned outer line component measuring opening 9 of a measuring point 5a and the sealing section 12 of the elongated body 10 is sealingly arranged in the measuring port 6, as shown in FIGS Figures 4, 5 , 15th and 16 can be found. If the sealing section 12 can no longer fulfill its sealing function, the fluid flowing through the inner line component 4 does not flow into the external environment but into the outer line component 3, which significantly increases the safety of the measuring point system 1 compared to known systems. As shown in the exemplary embodiments, a respective measuring nozzle 6 ends at a predetermined distance 25 from the associated external line component measuring opening 9, although this is not absolutely necessary, because the measuring nozzle 6 could also end inside the external line component measuring opening 9 as long as the sealing lip element 18 seals the external line component measuring opening 9 and there is a gap 24 between the measuring connector 6 and the sealing lip element 18, through which the fluid flowing in the inner line component 4 can flow from the measuring connector 6 into the space between the outer line component 3 and the inner line component 4.

So that a respective closure element 2 remains arranged in its locking position, a respective locking projection 20a, 20b has a holding surface 26 (see, for example, FIG Figures 9 and 19th ), which is arranged radially at the end on a respective locking projection 20a, 20b, and a respective external line component measuring opening 9 on the inside of the external line component 3, a blocking projection 27 (see FIG Figures 18 and 19 ) on. If a respective closure element 2 (regardless of whether it is at the measuring point 5a or 5b for Sealing of a respective external line component measuring opening 9 is to be locked at this) from its open position (this is in Figure 19 shown) in its locking position (this is in Figure 17 shown) is rotated, then the area in front of the holding surface 26 moves over the blocking lug 27. In the locking position of the respective closure element 2, the inclined holding surface 26 then rests against the blocking projection 27, with the blocking projection 27 blocking a movement of the respective closure element 2 in the direction of the open position through the inclined holding surface 26. So that the sealing section 12 and the sealing lip element 18 of the respective closure element 2, when the closure element 2 moves from the open position into the locking position, make a sealing contact with the inner line component measuring opening 7 and the outer component measuring opening 9, a respective locking projection 20a, 20b has a rising tightening surface 28 which is connected to the holding surface 26, which is designed to be sloping in relation to the rising tightening surface 28. Consequently, when the closure element 2 is rotated from the open position into the locking position, an operator has to exert increasing force in order to move the attraction surface 28 over the blocking projection 27. In other words, to fix the respective closure element 2 on the outer line component 3, when the at least one closure element 2 moves from the open position into the locking position, the rising tightening surface 28 moves over the blocking projection 27, the blocking projection 27 thereby moving the associated closure element 2 in the direction of the inner line component 4 urges.

It should be noted that the sealing section 12 can be designed with at least one sealing lip 14 in such a way that a sealing section 12 inserted through the external line component measuring opening 9 into the measuring connector 6 can be non-positively connected to the measuring stub 6 so that the holding force of the non-positive connection ensures the tightness of the measuring point system 1 without locking the closure element 2 being necessary for this.

The invention described above is of course not restricted to the embodiments described and illustrated. It is evident that numerous modifications, which are obvious to a person skilled in the art according to the intended application, can be made to the embodiments shown in the drawing, without thereby departing from the scope of the invention. The invention includes everything that is contained in the description and / or shown in the drawing, including that which deviates from the specific exemplary embodiments and is obvious to the person skilled in the art.

Claims (11)

1. An exhaust gas system with a boiler connection piece comprising a measurement site system (1) with

   • an external line component (3), which has at least one external line component measurement opening (9), and

   • an internal line component (4), which is at least partially surrounded by the external line component (3) and which has at least one measurement connection (6) extending externally from the internal line component (4) in the direction of the external line component measurement opening (9) and producing a connection to the interior (8) of the internal line component (4), with an internal line component measurement opening (7) formed on the end side,

   wherein at least one closure element (2) is detachably mounted on the external line component (3) and is configured closing the at least one external line component measurement opening (8),
   characterized in that
   a gap (24) is formed between the internal line component measurement opening (7) and the external line component (3), wherein the at least one closure element (2) has an elongated body (10) which, on mounting of the at least one closure element (2) on the external line component (3), extends at least partially to into the at least one measurement connection (6) and which is configured sealing both the at least one eternal line component measurement opening (9) and also the at least one internal line component measurement opening (7).
2. The exhaust gas system according to Claim 1, characterized in that the at least one measurement connection (6) ends at a predetermined distance (25) from the at least one external line component measurement opening (9).
3. The exhaust gas system according to Claim 1 or 2, characterized in that at a first longitudinal end (11) of the elongated body (10) of the at least one closure element (2) a sealing portion (12) is formed which, on mounting of the at least one closure element (2) on the external line component (3), is arranged within the at least one measurement connection (6), and on which at least one sealing lip (14) is formed, running around the elongated body (10) and protruding therefrom, which sealing lip is formed in an elastically deformable manner.
4. The exhaust gas system according to Claim 3, characterized in that at a second longitudinal end (16) of the elongated body (10) of the at least one closure element (2), a head portion (16), having a greater cross-section (17) compared to the elongated body (10), is formed for the handling of the at least one closure element (2).
5. The exhaust gas system according to Claim 4, characterized in that on the elongated body (10) of the at least one closure element (2) between the sealing portion (12) and the head portion (16) at least one sealing lip element (18) is formed, running around the elongated body (10) and formed in an elastic manner which, on mounting of the at least one closure element (2) on the external line component (3) on the outer side of the external line component (3) closes the at least one external line component measurement opening (9) in a sealing manner.
6. The exhaust gas system according to one of the preceding claims, characterized in that the at least one closure element (2) is able to be fixed detachably on the external line component (3) by means of a locking mechanism (19), wherein for the detachable fixing of the at least one closure element (2) on the external line component (3), the at least one closure element (2) is able to be rotated from an opening position, in which the closure element (2) is able to be withdrawn from the at least one external line component measurement opening (9), into a locking position, in which a movement of the at least one closure element (2) out of the at least one external component line component measurement opening (9) is blocked by means of the locking mechanism (19).
7. The exhaust gas system according to Claim 6, characterized in that the locking mechanism (19) comprises at least one locking lug (20a, 20b), which is formed on the elongated body (10) of the at least one closure element (2), wherein the at least one locking lug (20a, 20b) in locking position of the at least one closure element (2) is arranged engaging behind the edge (21) of the at least one external line component measurement opening (9), whereas the at least one locking lug (20a, 20b) in opening position of the at least one closure element (2) is arranged in alignment with a widened region (22) of the at least one external line component measurement opening (9).
8. The exhaust gas system according to Claim 7, characterized in that the at least one locking lug (20a, 20b) of the at least one closure element (2) has an ascending approach surface (28) and a descending holding surface (26), adjoining the ascending approach surface (28), and that at the at least one external line component measurement opening (9) on the inner side of the external line component (3) a blocking lug (27) is formed, wherein in locking position of the at least one closure element (2) the descending holding surface (26) lies against the blocking lug (27), and the blocking lug (27) blocks a movement of the at least one closure element (2) in the direction of the opening position.
9. The exhaust gas system according to Claim 8, characterized in that for fixing the at least one closure element (2) on the external line component (3) on movement of the at least one closure element (2) from the opening position into the locking position, the ascending approach surface (28) moves over the blocking lug (27), and the blocking lug (27) in doing so urges the at least one closure element (2) in the direction of the internal line component (4).
10. The exhaust gas system according to one of Claims 7 to 9, characterized in that on the elongated body (10) of the at least one closure element (2), two locking lugs (20a, 20b) are formed, which are formed diametrically with respect to one another on the elongated body (10).
11. The exhaust gas system according to Claim 10, characterized in that at the at least one external ling component measurement opening (9) a stop region (23) is formed, against which one of the two locking lugs (20a, 20b) lies in locking position of the at least one closure element (2) .

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