DE69432682T2 - Discharge structure for closed gas heaters - Google Patents

Abstract

The discharge pipe of chimney (1) has an outer tubular casing (30) and a concentric inner gas exhaust pipe (20). The pipes (20,30) define an annular passage for a combustion air supply (A) with an air supply hood (40) feeding ambient air into said passage. An exhaust hood (50) connects the exhaust gas duct (20) to atmosphere and protrudes outwards of the air supply hood (40). A number of venting passages (48) are provided in air supply hood (40) to short circuit the main air passage and vent of any surplus air to atmosphere.

Description

The invention relates to a mouth construction for closed Gas appliances. Such mouth constructions form the main component of a roof or wall connection, for example for boilers and include a line for the supply of combustion air and a line for the discharge of combustion gases. The mouth construction includes about it a feeder for Combustion air, for example in the form of a feed hood, the a connection between the outside air and the supply line for Forms combustion air, as well as a flow-promoting exhaust air for combustion gases, for example in the form of an air flow hood that connects between the discharge line for Combustion gases and the outside air forms. The laxative is in one in comparison to the feed greater distance from the location where the gas appliance is located, this means with vertical arrangement of the mouth construction above of the feed means.

Such a mouth construction is also as wall or roof connection construction (terminal construction) designated. In this context, the inner end becomes that end considered, that with the combustion air supply and the combustion gas discharge the gas device itself, either over a pipe distributor or without one, must be connected, wherein the combustion gas discharge line through the pipe distributor or a branch pipe and the combustion air supply line in the orifice construction - relative to each other arranged concentrically - in parallel lines can be converted.

A mouth construction according to the generic term of claim 1 is known from EP-A-0 491 444.

According to the invention is an improved mouth construction for closed Gas appliances like described in claim 1, provided.

The ventilation passage forms for the combustion air a direct connection between that formed by the air supply means Main passage and the outside air. A pressure that rises too much within the air supply means, in particular inside the air supply hood, resulting in or failure of the burner air currents caused thereby a Reduction of the efficiency of the device due to loss of standstill can be controlled by this.

Is the combustion air supply formed as a feed hood that at its inner end over the outer end of the cladding is sufficient and thus an entrance to the main passage is the ventilation passage preferably in or at the outer end the hood, in particular in the form of one or more holes.

Advantageous embodiments are in the attached Dependent claims, the disclosure of which is incorporated herein by reference, and described by what is shown in the drawing.

It should be noted that US-A-3,361,051 is a Discharge structure disclosed with an air supply hood having a main passage has radially extending portions formed by in the circumferential direction spaced protrusions are limited.

The combustion gas discharge means can from an outside end of the inner tube itself, but it will, in particular in vertical mouth constructions, preferably formed by a combustion gas discharge hood.

The invention is described below Discussion of several embodiments the mouth construction according to the invention based on the attached Drawing described.

1 FIG. 2 is a vertical exemplary embodiment of an outlet construction according to the invention, which contains a view of the outlet construction on the left-hand side and a cross section through the outlet construction on the right-hand side, FIG.

1A shows a detail at the bottom of the mouth construction of 1 .

1B shows a detail of the air supply hood of the orifice construction of FIG 1 .

1 C shows a detail of the air supply hood / air flow hood of the orifice construction of FIG 1 .

2 shows an alternative embodiment of the mouth construction according to the invention, and

2A shows a detail of the connection of the air supply hood and the combustion gas discharge hood of the mouth construction of FIG 2 ,

The mouth construction 1 of 1 includes an inner tube 20 for the discharge of combustion gases in a direction B to the outside, an outer pipe 30 for the supply of combustion air in a direction A from the outside to a boiler (not shown), an air supply hood 40 , a combustion gas discharge hood 50 , an insulating piece 60, a retaining ring 70 as well as a clamping ring 80 , The lower end of the orifice construction can be connected either directly to connecting pieces of the boiler or to concentric line parts connected to it. However, it can also be connected to it via a so-called pipe distributor and parallel line elements. If necessary, the parts can be considered 70 and 80 to integrate into the pipe distributor. The inner tube 20 goes over an annular shoulder at its outer end, in this case at its upper end 22 into a section 21 with larger diameter over. The shoulder is of particular importance here 22 , whose function is described in detail below. In the drawing there is the outer tube 30 in two parts 30a and 30b , The pipe part 30a has a length adapted to the external conditions. The length of the outer tube 30b can also be easily adapted to local conditions. At the bottom is the pipe part 30a with a weather collar 39 ' and provided with a retaining ring 39 "arranged therein, which holds the pipe part in place 3b relative to the pipe part 30a acts in the radial direction. The weather collar 39 ' also serves to accommodate the upper end of a so-called adhesive plate 90 (i.e. a flat roof adapter for bitumen) to seal the passage through the roof 10 , The sticky plate 90 is tightly connected to the roof cover (not shown). At its upper end, the pipe part points 30a a number of radial space dividers distributed in the circumferential direction 31 on, each with a recess at its upper end 32 are provided. Below the small room dividers 31 are immediately adjacent radially projecting spacer fingers 34 arranged, which are also distributed evenly over the circumference. Among them are two circumferential pressure increase rings 35 and 36 and again two circumferential fastening ribs underneath 37 and 38 arranged. A sealing ring can be accommodated between these ribs in the event that an adhesive plate 90 ' , is located at that point. Such an arrangement, in which the mouth construction is less far than on the right side of 1 shown above the roof is allowed in some countries.

At the bottom is the air supply hood 40 provided with a ring-shaped outside air supply opening, and - viewed from the bottom upwards - begins with an edge 42 , a first substantially cylindrical section 41 which over a first radial step into a second substantially cylindrical section 43 passes with a reduced diameter, the section 43 over a tapered section 45 passes into a second substantially radial stage, which finally in a third substantially cylindrical section 46 ends. A raised all-round collar 47 is compared to the section 46 arranged radially further out while between the two parts 46 and 47 , at the second radial stage, a number of air outlets 48 is provided, which are evenly distributed in the circumferential direction, the air passages forming a short circuit between the passage from the outside to the (ing-shaped line and the outside air, so as to allow over-air ventilation.

The gas discharge hood 50 comprises - viewed from the bottom up - an annular lower section 55 which on its radial inside with a raised ring 54 is provided, lying further out a hanging ring or a series of projections 56 and further out there is a ring extending downwards 57 available. Above the ring-shaped bottom 55 is a circumferential, slightly tapered screen 58 or a windbreak tape arranged over the raised sections 51 ' with the floor and over legs 51 '' with a circumferential lid support 53 connected is. This will be below the screen 58 Air flow openings 59 ' and above the screen 58 exhaust holes 59 " released. The lid 52 is placed on the exhaust hood so that is prevented; that rain penetrates or objects fall into the extractor hood, the effect of the extractor hood also being improved in the event of a falling wind.

The collar 47 , the annular lower section 55 and the ring 57 form a labyrinth-like screen for the air openings 48 ; thereby preventing rain from entering and a gust of wind affecting the excessive air pressure reducing effect of openings 48.

An insulating piece 60 is around the inner tube 20 arranged around, with the insulating piece from the lower end of the outer tube 30 extends to the gas discharge hood.

The assembly of the mouth construction 1 is done as follows. The pipe 20 is held upside down so that the widened section 21 pointing down. If necessary, the widened section 21 be placed on a frame with a suitable comparable diameter. Then the gas discharge hood 50 sliding over the inner or lower - now upper - end of the inner tube until the ring 54 the shoulder 22 touched. The discharge hood is thereby prevented from further movement in this direction and is also held in the center relative to the inner tube. Then, the air supply hood 40 is slid down over the inner tube until the axial annular portion 46 the annular bottom 55 the exhaust hood 50 touched. Here the section 46 in the radial direction from the ring or a series of cams 56 held. In the case shown here, in which an insulating piece 60 is present, the diameter of the section 46 the feed hood 40 chosen such that there is a radial space for the insulating piece. The next step is to slide the insulating piece over the inner tube until the part that now represents the lower end also forms the annular bottom 55 touched the exhaust hood, and at that point through the section 46 the feed hood 40 is held in the middle. Then the outer tube 30 over the inner tube 20 and the insulating piece 60 lowered until the top edge of the recesses 32 the small room divider 31 the inner surface of the wall area of the feed hood 40 close to the transition from the cylindrical section 43 and the associated first stage ( 1B ) touched. As a result, the outer tube is held in both the axial and radial directions relative to the other parts. The little ones in between room divider 31 , form airflow openings. The finger 34 also contribute to the central alignment of the parts 30 and 40 relative to each other and also leave a space for flow openings. Air can pass from the outside past the edge 42 between the fingers 34 through the room 44 and between the small room dividers 31 flow inward to, so into the annular space between the outer tube 30 and the insulating piece 60 to enter in a direction A.

After installing the outer tube, the retaining ring 70 installed, the retaining ring with two rings 71 and 73 is provided, which is arranged concentrically relative to each other and with each other by means of small radial space dividers 72 are connected. Between the small radial space dividers there is enough space for flow openings of the combustion air, which is fed to a pipe distributor, not shown in detail, which is almost tightly connected to the inner end of the annular space, and which is connected on the outside to the air supply and gas discharge of the gas device , At its top is the inner ring 73 , as in 1 can be seen with a positioning edge 74 provided by which the insulating piece 60 relative to the inner tube 20 is positioned. The ring 71 is designed so that it fits snugly on the outer tube 30b seated. Eventually, one gets tight on the inner tube 20 mounted ring 80 moves smoothly until it touches the retaining ring 70 strikes, and then using pointed screws 81 on the inner tube 20 attached. As a result, the exhaust hood 50 who have favourited Feeder Hood 40 , the outer tube 30 and the insulation piece 60 between the shoulder 22 and the clamping ring 80 are held. After this is done, the mouth construction is turned over and the lid 52 is on the hood 50 appropriate. This can be done for example by means of screws or by means of a snap connection.

The various components of the mouth construction according to the invention can be made of aluminum (high grade or not), stainless steel or steel, galvanized according to the Sendzimir method. Due to the chosen type of assembly, most of the components can also be made of a synthetic material. This applies to the gas discharge hood (PBT), the air supply hood that is not exposed to high temperatures and can therefore be made of PVC, the part of the outer tube that projects above the roof 30a and the part of the outer tube 30b below the roof, which can both be made of a synthetic material, such as PVC or PE, the retaining ring and the clamping ring.

2 shows an alternative mouth construction 401 , which is essentially an inner tube 120, a housing 130 , an air supply hood 140 and a combustion gas discharge hood 150 includes: The mouth construction 101 is essentially the mouth construction of 1 similar. The combustion gas discharge hood 150 However, it tapers more than the combustion gas discharge hood 50 , Compared to conventional circular-cylindrical combustion gas discharge hoods, there is a smooth flow pulse, while the guiding function and the shielding function are retained in the wind. In addition, the combustion gas discharge hood 150 whose cover 152 can be removed, pushed together so that it takes up less space, for example, during a transport from the manufacturer to the next link in the supply chain. The selected shape also offers advantages in the manufacturing process due to the self-releasing shape.

Another special feature of the mouth construction of 2 is in

2A shown. In particular in the event that the combustion gas discharge hood is made of a different material than the air supply hood 440 For example, if the former is made of injection-molded aluminum and the latter is made of a synthetic material, it may be desirable to use a temperature buffer in the form of a ring 200 to be installed, which is concentric to the center line of the mouth structure and is made, for example, of synthetic PBT, which has a high temperature resistance.

In the event that the temperature is unproblematic with regard to the connection of the different types of materials of the combustion gas discharge hood and the air supply hood, the ring can 200 optionally also be used as an optional component for over-air ventilation at the above-mentioned short circuit between the passage from the outside to the annular line and the outside air. For this purpose the ring is 200 with hanging protrusions 202 provided, which are spaced apart in the circumferential direction and between which free radial passages 203 consist of the excess air inside the air supply hood to the outside, around the downwardly extending ring 157 can flow around.

Note that corresponding parts in 1 and 2 similar reference numerals, in 2 each larger by 100.

Claims (11)

Mouth construction ( 1 ; 101 ) for closed gas appliances with an inner end and an outer end, comprising: an outer tubular jacket ( 30 ; 130 ) with an outer end and an inner end; an inner gas discharge pipe ( 20 ; 120 ) for the removal of combustion gases with an outer end and an inner end, the inner tube being set up inside the jacket in order to determine an annular supply line for combustion air; a combustion air supply means such as an air supply hood ( 40 ; 140 ) which forms a connection between the outside air and the annular supply line, near its outer end; a combustion gas discharge, such as a hood ( 50 ; 150 ) which forms a connection between the outside air and the gas discharge pipe, near its outer end, and which is positioned further than the combustion air supply means from the inner end of the orifice structure; the combustion air supply means forming a main passage extending between the outside air and the annular supply line, and at the same time with a ventilation passage ( 48 ; 203 ) is provided, characterized in that the ventilation passage ( 48 ; 203 ) forms a short circuit between the main passage and the outside air. Muzzle construction according to claim 1, wherein the combustion air supply means comprises an air supply hood ( 48 ; 203 ) which extends on its inner end over the outer end of the jacket ( 30 ; 130 ) extends and thus determines an entrance of the main passage, the ventilation passage ( 48 ; 203 ) is provided for venting excess air from the main passage to the outside air at the outside end of the air supply hood. Mouth construction according to claim 2, wherein the ventilation passage through between the outer end of the air supply hood ( 140 ) and the combustion gas discharge means ( 150 ) radial openings ( 203 ) is formed. Mouth construction according to claim 3, wherein the radial passages ( 203 ) all around by - preferably hanging - protrusions arranged in the circumferential direction from each other ( 202 ) can be limited. Mouth construction according to claim 4, wherein the protrusions on a between the air supply hood ( 140 ) and the gas discharge means ( 150 ) inserted ring ( 200 ) are provided, the ring ( 200 ) is preferably made of a material with a relatively high temperature resistance, so as to form a temperature buffer. Mouth construction according to claim 2, wherein the ventilation passage ( 48 ) is arranged in the form of one or more holes. Mouth construction according to one of the preceding claims, wherein the combustion gas removal means comprises a hood ( 50 ; 150 ), the inner end of which is covered with a rain and / or wind screen, such as a collar ( 57 ; 157 ) to shield the opening of the ventilation passage ( 48 ; 203 ) in the combustion air supply hood. Mouth construction according to one of the preceding claims, wherein the outer end of the combustion air supply hood ( 40 ) with a rain and / or wind screen, like a collar ( 47 ) to shield the opening of the ventilation passage ( 48 ) is provided. Mouth construction according to claim 8, if dependent on claim 7, wherein the rain and / or wind screen ( 57 ) on the gas discharge hood ( 50 ) and the rain and / or wind screen ( 47 ) on the air supply hood ( 40 ) form a labyrinth. Mouth construction according to claim 9, wherein the rain and / or wind screen ( 57 ) on the gas discharge hood ( 50 ) over the rain and / or wind screen ( 47 ) on the air supply hood ( 40 ) protrude. Discharge structure ( 1 ; 101 ) according to any one of claims 1-10, adapted and designed for use as a vertical roof terminal structure.