EP0399245A2 - Tiled stove with gas heating installation. - Google Patents

Abstract

The aim is to design a gas heating installation, which is suitable in particular for tiled stoves, with a simple and expedient construction in such a manner that the advantages of tiled stoves, that is to say high thermal comfort by means of a high proportion of radiant heat and free design possibilities of the tiled stove, are also maintained in the case of firing with gas. This is achieved, by using gas heating elements (1) with a radiant burner (7) and with a cover plate, preferably made of a heat-resistant, transparent material, such as glass ceramic or the like, in that each gas heating element (1) has on its housing underside and its housing upper side insertion connections (20, 21) aligned coaxially with one another, such as pins, sleeves or the like, which interact with coaxially aligned bearing points on a lower support frame (23) and an upper waste gas collector (24) parallel thereto, the support frame (23) and the waste gas collector (24) being connected by a front panel frame (25) and each gas heating element being pivotable and fixable about the vertical axis (26) defined by the bearing points. As a result of this, the gas heating elements, in relation to the support frame and the waste gas collector, can according to requirements be freely rotated, fixed and thus optimally aligned in a simple manner onto the inner walls of the tiled stove which are to be heated. This makes possible optimal individual action upon the inner tiled stove surfaces by radiant heat and opens up very variable possibilities of use in the most different tiled stove shapes, with simple installation and removal using a small number of standardised components. <IMAGE>

Description

The invention relates to a gas heating device for heating chambers, in particular for tiled stoves with one or more gas heating elements, each of which consists of a box-shaped housing with a radiant burner on one side of the housing and with a cover plate made of a temperature-resistant, preferably transparent material, such as glass ceramic or the like, on the one Radiation burner opposite the housing side and has at least one combustion air inlet, a gas connection and an upper exhaust vent.

Due to the increasingly strict regulations for environmental protection, the use of natural gas as a fuel for tiled stoves is attracting increasing interest. Many consumers want a combination of the advantages of the tiled stove, such as a dignified living atmosphere and a comfortable indoor climate, with the characteristic advantages of natural gas, namely environmentally friendly combustion, problem-free availability, no storage problems, problem-free and clean use, fast and automatic control of the heating output, no disposal problems and also No pre-financing of the necessary gas quantities due to the unnecessary storage in the home.

However, a combination of tiled stove and natural gas as fuel has not yet been possible in an ideal way, since the available device technology makes it necessary to cut back.

After the conversion of tiled stoves from heating with solid fuels to heating with natural gas, it can happen that the owner complains about drafts and a generally lower level of comfort, even though the heating element has been installed properly.

The reason for this is that due to the special design of the gas heating inserts available on the market, the usual temperature of the tile surfaces can no longer be reached.

When using solid fuels or heating oil, the heating gases are led directly past the inside of the tile by means of specially bricked heating gas flues after leaving the heating insert. A large part of the heat is therefore not given off to the air flowing through, i.e. convectively, to the room, but via the tile surfaces and thus as radiant heat. The high proportion of radiant heat means that even at a relatively low room temperature, residents experience a subjective feeling of comfort.

In contrast, with gas heating inserts of the construction currently available on the market, the heat of combustion is almost exclusively released into the air flowing through, ie convectively, into the room. The inner surfaces of the tiles are warmed considerably less by the warm air flowing past them, the temperature of which when they exit into the room is limited to 75 ° C or 348 K according to the guidelines for the construction of tiled stove warm air heaters than by direct contact with the heating gases. The heating of the tile surfaces is also essentially concentrated on the upper part of the furnace, since the air flowing through is still cold in the lower region and is only heated in the upward flow by contact with the heating insert.

When switching from, for example, solid fuel to gas, there is also the fact that, for fluidic reasons, parts of the interior of the tiled stove have to be separated from the air flow by baffles, so that even lower temperatures arise on the tiled surfaces thus separated. With gas firing using the heating inserts offered today, there is therefore only a very small proportion of radiation in the heat supply of the room. An increase in the temperature level in the room by 2 to 3 K is required. Otherwise there may be feelings of discomfort and - due to the thermal stratification in the room - especially in the leg and foot area, the above-mentioned subjective drafts. Associated with the higher indoor air temperature is a higher energy consumption, without the same level of comfort as at higher tile temperatures.

The reason for the fact that a higher proportion of radiation has to be dispensed with when using gas as fuel is that the gas heating inserts must not be followed by heating gas flues bricked to the inside of the tile. The entire heat generator including all heating surfaces is subject to the DIN / DVGW type test. After leaving the heat generator, the heating gases or exhaust gases must be discharged directly into the chimney. The use of downstream heating gas flues would theoretically be considered via a single test, but this is already ruled out in practice due to the associated test costs, quite apart from the expected functional problems.

In contrast, when firing with solid fuel or heating oil, there is great freedom in the design of the shape and size of the tiled stove. Essentially only the combustion takes place in the heating insert. The heat transfer to the air flowing through and to the tile surfaces takes place through brick heating gas flues, the course of which can be tailored to each tiled stove shape and size.

It is different with gas heating inserts, in which almost all of the heat has to be absorbed by the air flowing through when it comes into contact with the surface of the heating insert. This makes it necessary to adapt the shape and size of the tiled stove to the dimensions of the heating insert, and there are not many options in this regard. If the interior of the tiled stove is too large, only an undefined part of the air is heated and thus an insufficient air flow or air temperature when it exits the tiled stove into the room. When converting existing tiled stoves to gas, it is usually necessary after removing the heating gas flues to ensure the required flow conditions in the tiled stove room by attaching sheet metal partitions, but with the above-mentioned compromises in terms of tile surface temperature and thermal comfort.

The invention has for its object to provide a gas heating device according to the preamble of claim 1, which is particularly suitable as a heating insert for tiled stoves, in a simple and functional design so that the advantages of tiled stoves, namely high thermal comfort, even when fired with gas a high proportion of radiant heat and free design options of the tiled stove are retained.

This object is achieved according to the invention in connection with the features of the preamble in that each gas heating element on its housing underside and on its housing top has coaxially aligned plug-in connections such as pins, sleeves or the like, which have coaxially aligned bearing points on a lower support frame and one parallel upper exhaust manifold cooperate, the support frame and the exhaust manifold are connected by a front plate frame and each gas heating element is pivotable and lockable about the vertical axis defined by the bearing points.

The invention has the advantage that the connection piece of the exhaust manifold and the exhaust port of the individual gas heating elements as well as the connections of the gas heating elements with the lower support frame lie exactly above the axis points of the support frame, so that the gas heating elements relative to the support frame and the exhaust manifold are free as required rotated and thus can be optimally aligned in a simple manner to the inner walls of the tiled stove to be heated. This enables the individual tiled stove surfaces to be optimally exposed to radiant heat and opens up a wide range of possible uses in a wide variety of tiled stove shapes with easy installation and removal using fewer standardized components.

The front plate or niche frame is used to hold the front plate, with which the heating chamber of the tiled stove is closed towards the operating and connection side. Connection fittings for the gas and power supply of the gas heating system are integrated in the front plate or niche frame. If necessary, a flow safety device can be integrated in the upper part of the front plate frame.

The support frame consists of one or more molded parts made of sheet steel, which have a flat-lying U-profile and can be variably combined depending on the respective tiled stove layout, with a selection of three molded parts with different shapes and sizes offering a wide variety of design options results. Plug connections in the form of pins, sleeves or the like for accommodating the individual gas heating elements are arranged at equal intervals on the molded parts of the support frame. The support frame construction is screwed to the lower profile of the front panel or niche frame and can e.g. be anchored on trestles or on the tiled stove base. Flexible gas lines and the power cables to the gas heating elements are laid in the U-profile of the support frame, which is open at the top.

The exhaust gases are led vertically upwards from the individual gas heating elements into the exhaust gas collector and from there into the chimney. The flue gas collector consists of one or more molded parts, which are arranged in the same way as the supporting frame. The main part of the flue gas collector has openings on the side and on both ends, which can be used to expand the collector laterally by means of pipes and to connect a fitting for connection to the flow control in the front panel and to the chimney. Unused openings on the exhaust manifold are closed by blind flanges and can be opened for inspection purposes.

The invention has the further advantage that the radiant heat of the radiant burner with appropriate mounting of the gas heating element in the heating chamber practically the furnace walls heats up immediately and ensures even heat distribution when passing through the furnace walls. The cover plate of the gas heating element can consist of a temperature-resistant, transparent material, such as glass ceramic or the like, so that the heat radiation from the radiant burner passes through the cover plate and is used directly for heating the furnace walls. Due to the lack of contact between the cover plate and the tile surface, the different expansion coefficients of the materials of the housing, cover plate and stove or tile wall are irrelevant.

If an opaque cover plate, for example made of cast iron, is used, the gas heating module essentially serves for convective heat transfer to the surrounding air.

When using a transparent housing cover plate, the distance to the furnace wall and thus the tile surface exposed to the heat rays can be varied. This enables a more even temperature distribution and the inclusion of those parts of the tiled stove that, due to their design, cannot be heated by direct contact, such as narrow corners and niches.

Depending on the size, shape and heat output of the tiled stove, one or more gas heating elements can be used. The gas connection of the individual gas heating elements to a common control and safety valve can be made using pressure-resistant, flexible gas hoses. Installation and maintenance are carried out through the front frame opening.

Any separation of excess spaces inside the tiled stove that may be necessary for fluidic reasons does not lead to temperature fluctuations in parts of the tiled surface.

A basic tiled stove can also be converted to gas by installing one or more gas heating elements.

The number and placement of the gas heating elements in the heating chamber of the stove depends on the heat output, shape and size of the tiled stove, the criterion of the free design options of the tiled stove not being impaired.

In addition, two further advantageous additional effects are achieved with such gas heating devices:

The low-NO _x combustion gases of the radiant burner further increase the environmental friendliness of the device given by the gas fuel; in addition, the arrangement of the gas heating elements in the lower tiled stove area means that the radiant heat is predominantly effective in the leg and foot areas of the room profile. The risk of drafts, which are usually felt in this area, is thus increasingly counteracted. Cooler tiled surfaces at head height are to be assessed physiologically as positive.

Overall, the invention provides completely new, better prospects for the use of gas in the tiled stove and thus also for the construction of gas-heated tiled stoves.

• Fig. 1 eine auseinandergezogene raumbildliche Darstellung eines Gasheizelementes mit Flächenstrahlungsbren­ner,
• Fig. 2 einen senkrechten Schnitt durch ein solches Gas­heizelement,
• Fig. 3 einen horizontalen Schnitt durch das Gasheizele­ment gemäß Schnittlinie III - III von Fig. 2,
• Fig. 4 ein Modulsystem mit zwei zwischen einem unteren Tragrahmen und einem oberen Abgassammler schwenk­bar angeordneten Gasheizelementen in Seitenan­sicht,
• Fig. 5 eine Draufsicht auf den Tragrahmen bei Einbau in den Brennraum eines Kachelofens,
• Fig. 6 die Einzelteile eines solchen Systems mit Gas­heizelementen von Fig. 4 und 5 in auseinanderge­zogener Darstellung,
• Fig. 7 einen aus mehreren Formteilen zusammengesetzten unteren Tragrahmen eines solchen Systems in Seitenansicht,
• Fig. 8 eine Draufsicht auf den Tragrahmen von Fig. 7,
• Fig. 9 einen aus mehreren Formteilen zusammengesetzten Abgassammler in Seitenansicht und
• Fig. 10 eine Draufsicht auf diesen Abgassammler.

Preferred embodiments of the invention are shown schematically in the drawing. Show it

• 1 is an exploded spatial representation of a gas heating element with radiant panel burner,
• 2 shows a vertical section through such a gas heating element,
• 3 shows a horizontal section through the gas heating element according to section line III - III of FIG. 2,
• 4 shows a side view of a module system with two gas heating elements pivotably arranged between a lower support frame and an upper exhaust manifold,
• 5 is a plan view of the support frame when installed in the combustion chamber of a tiled stove,
• 6 shows the individual parts of such a system with gas heating elements from FIGS. 4 and 5 in an exploded view,
• 7 is a side view of a lower support frame of such a system composed of several molded parts,
• 8 is a plan view of the support frame of FIG. 7,
• 9 is a side view of an exhaust manifold composed of several molded parts and
• Fig. 10 is a plan view of this exhaust manifold.

The gas heating device shown is intended in particular as a built-in system for tiled stoves 9 and can be composed of one or more gas heating elements 1, each of which consists of a box-shaped housing 6 with a ceramic surface radiation burner 7 on one side of the housing and with a cover plate 8, preferably a temperature-resistant, transparent one Material, such as glass ceramic or the like, on the radiation burner 7 Opposite side of the housing and has a plug connection in the form of a socket 23 to the support frame, a cross member 34 for receiving a control and regulating valve 35 and an upper exhaust pipe 5 coaxial with the socket 33. A gas connection 2 is located next to a combustion air inlet 4.

The housing 6 of the gas heating element 1 can have outer heating or heat exchanger fins 11.

The cover plate 8 can be part of the housing 6 or flanged to it, the housing 6 having a cross-section widening from the radiant burner 7 to the cover plate 8 between widening side walls 12 and parallel end walls 13.

The radiation burner 7, as can be seen in particular in FIGS. 1 and 2, is advantageously arranged on the lower part of the housing 6 parallel to the cover plate 8.

To improve the heat dissipation to the air flowing around the gas heating element 1, the heat exchangers or heating fins 11 extend on the diverging side walls 12 of the box-shaped housing 6 of the gas heating element 1 between the end walls 13 at a parallel distance from one another, and in parallel to this the housing 6 has one after external circumferential flange 15 with holes 16 for fastening the cover plate 8.

The housing 6 is advantageously made of stainless steel, cast iron, cast aluminum or the like.

The equipment of such gas heating elements 1 with surface radiation burner 7 causes a very high proportion of heat radiation which, when using a transparent cover plate 8, is largely transferred directly to the inner surfaces of the tiles, while the peripheral surfaces of the gas heating element 1 are mainly heated by the heating gases and which flow around the heating element Warm air. If an opaque cover plate is used, the heat radiation from the burner by heating the cover plate also contributes to convection.

To ensure sufficient convective heat transfer, the surface of the side walls of the gas heating element 1 can be enlarged by the heat exchanger or heating fins 11. When using a non-transparent cover plate 8, its surface should be enlarged in the same way to improve the heat transfer.

Such a gas heating element 1 has a particularly favorable heat emission if it consists of stainless steel, cast iron, cast aluminum or the like.

A conventional ceramic surface radiation burner 7 with electrical ignition and ionization monitoring should be used as the burner, the power per gas heating element being in the range of approximately 3 to 4 kW. The burner housing should be made of sheet steel and be easy to remove from the heating element housing 6 for assembly and maintenance.

As shown in FIGS. 4 to 10 in detail, each gas heating element 1 has coaxially aligned with one another on its underside and on the top of its housing Plug connections 20, 21, such as pins, sleeves or the like, namely an upper exhaust pipe 5 and a lower plug sleeve 33 for pivotable mounting on a lower support frame 23 and a parallel upper exhaust manifold 24 with common bearing points, which are connected by a front plate frame 25 and between which each gas heating element 1 is arranged to be pivotable and lockable about an axis 26 perpendicular to the support frame 23 and the exhaust manifold 24.

The lower support frame 23 and the upper exhaust manifold 24 consist of one or more congruently connectable molded parts 23a, 23b, 23c or 24a, 24b, 24c made of sheet steel or the like, of which the molded parts arranged vertically one above the other each have the same horizontal length, so that a molding of the support frame 23 and the exhaust manifold 24 together with the front panel frame 25 and at least one gas heating element 1 form an assembly unit.

Both the support frame 23 and the exhaust manifold 24 are composed of shaped parts 23a, 23b, 23c and 24a, 24b, 24c, which are rectangular in plan and on which the bearing points for the rotatable arrangement of gas heating elements 1 are arranged at equal intervals 27.

The support frame 23 consists of shaped parts 23a, 23b, 24c with a flat U-shaped profile, which have 28 rows of holes 29 on their vertical profile legs, each with the same hole spacing for an optionally elongated or angular stringing together of such molded parts by means of screw connections or the like, as is the case here 7 and 8.

As can be seen in particular in FIGS. 7 to 10, individual molded parts 23a, 23b, 23c or 24a, 24b, 24c of the support frame 23 and the exhaust manifold 24 are formed with end connections 30, 31 which are angularly matching in plan, individual molded parts 23a, 23c of the support frame 23 and the exhaust manifold 24 may have an angular cutout at the end for corner installation at an angle, for example between 30 ° and 60 °, preferably 45 °, on each of the other molded parts of the support frame and the exhaust manifold.

Axle pins 32 protrude from the support frame 23 for plug sleeves 33 directed downward from the gas heating elements 1, the connection of which to the gas heating element 1 can be reinforced by the fact that the plug sleeve 33 is attached to the gas heating element with an angular crossmember 34 attached to its lower end wall 13 for control purposes. and / or control fittings 35 or the like is firmly connected. (Figs. 2, 4 and 6)

The support frame 23 can be firmly connected to a lower profile 25a (FIGS. 4 to 6) of the front plate frame 25 and is preferably screwed to it.

In the upper part of the front plate frame 25, a flow safety device 36 connected to the exhaust manifold 24 can additionally be arranged, which is connected via a pipe 37 to an exhaust pipe 37a leading to the chimney, and finally the exhaust manifold 24 can be seen in FIGS. 9 and 10 is built up from a cuboid shaped part 24a as a main part with at least one or two downwardly directed connecting pieces 38 for gas-tight connection with the matching exhaust pipes 5 of at least one or two gas heating elements 1, furthermore front and / or longitudinal connecting openings 39 for lateral expansion of the exhaust manifold 24 by means of pipes 40 and for connecting a fitting with connection to the flow control 36 on the front plate frame 25 and the chimney are available.

List of reference numbers

• 1 gas heating element
• 5 Exhaust fume hood, exhaust pipe
• 6 housing
• 7 radiant burner
• 8 cover plate
• 9 tiled stove
• 11 heating / heat exchanger fins
• 12 side wall
• 13 end wall
• 15 flange
• 16 holes
• 20 plug connection
• 21 plug connection
• 23 support frame
• 23a molded part
• 23b molded part
• 23c molded part
• 24 exhaust gas collectors
• 24a molded part
• 24b molded part
• 24c molding
• 25 front panel frames
• 25a profile
• 26 axis
• 27 distances
• 28 profile legs
• 29 rows of holes
• 30 connection
• 31 connection
• 32 journals
• 33 receptacle
• 34 traverse
• 35 Control and regulating valve
• 36 Flow control
• 37 tube
• 37a exhaust pipe
• 38 connecting piece
• 39 connection opening
• 40 pipe

Claims (12)

1. Gas heating device for heating chambers, in particular for tiled stoves, with one or more gas heating elements (1), each of which consists of a box-shaped housing (6) with a radiation burner (7) on one side of the housing and with a cover plate (8), made of a temperature-resistant, preferably transparent material, such as glass ceramic or the like, on one side of the housing opposite the radiant burner (7) and has at least one combustion air inlet (4), a gas connection (2) and an upper exhaust gas outlet (5), characterized in that each gas heating element (1) has on its housing underside and on its housing top coaxially aligned connectors (20, 21), such as pins, sleeves or the like, which cooperate with coaxially aligned bearings on a lower support frame (23) and a parallel upper exhaust manifold (24), the Support frame (23) and the exhaust manifold (24) through a front plate ttenrahmen (25) are connected and each gas heating element (1) about the vertical axis defined by the bearing points (26) is pivotable and lockable. 2. Gas heating device according to claim 1, characterized in that the lower support frame (23) and the upper exhaust manifold (24) from one or more congruently connectable molded parts (23a, 23b, 23c or 24a, 24b, 24c) made of sheet steel or the like exist, of which the vertically one above the other molded parts each have the same horizontal length, so that a molded part of the support frame (23) and the exhaust manifold (24) together with the front panel frame (25) and at least one gas heating element (1) form an assembly unit. 3. Gas heating device according to claim 2, characterized in that the shaped parts (23a, 23b, 23c or 24a, 24b, 24c) are rectangular in plan, and that on them the bearing points for the pivotable arrangement of the gas heating elements (1) in the same Distances (27) are arranged. 4. Gas heating device according to claim 3, characterized in that the supporting frame (23) forming, in plan rectangular shaped parts (23a, 23b, 24c) consist of a flat-lying U-profile, the rows of holes (29) on its vertical profile legs (28) each with the same hole spacing for an optionally elongated or angular stringing together of such molded parts by means of screw connections or the like. 5. Gas heating device according to one of claims 2 to 4, characterized in that individual molded parts (23a, 23c or 24a, 24c) of the support frame (23) and the exhaust manifold (24) are designed with angled, matching end connection connections in plan. 6. Gas heating device according to one of claims 2 to 5, characterized in that individual molded parts (23a, 23c or 24a, 24c) of the support frame (23) and the exhaust manifold (24) at the end an angular cutout for corner installation at an angle between 30 ° and 60 °, preferably 45 °, on each of the other molded parts of the support frame and the exhaust manifold. 7. Gas heating device according to one of claims 1 to 6, characterized in that from the support frame (23) journal (32) for from the gas heating elements (1) directed downward socket sleeves (33). 8. Gas heating device according to claim 7, characterized in that the lower plug-in sleeve (33) on the gas heating element (1) with a fixed to its lower end wall (13) angled cross member (34) for control and / or regulating fittings (35) or the like connected is. 9. Gas heating device according to one of claims 1 to 8, characterized in that the support frame (23) with the lower profile of the front panel frame (25) is firmly connected, preferably screwed. 10. Gas heating device according to one of claims 1 to 9, characterized in that in the upper part of the front panel frame (25) with the exhaust manifold (24) connected flow control (36) is arranged. 11. Gas heating device according to one of claims 1 to 10, characterized in that the exhaust manifold (24) from a cuboid shaped part (24a) with at least one or two downwardly directed connecting pieces (38) for gas-tight connection with the matching exhaust pipe (5) consists of at least one or two gas heating elements (1) and also front and / or longitudinal connection openings (39) for laterally expanding the exhaust manifold (24) by means of pipes (40) and for connecting a fitting with a connection to the flow safety device (36) on the front plate frame (25 ) and to the chimney. 12. Gas heating device according to one or more of claims 1 to 11, characterized in that the cover plate (8) on the gas heating element (1) consists of a non-transparent material, such as metal or the like.

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