SE520384C2 - Heating stove with modules - Google Patents

Abstract

The present invention relates to a heating stove comprising a combustion chamber and heat exchanger for the beneficial utilisation of the thermal energy from fumes, whereby the heating stove comprises modules removably arranged on one another, a first module (10), a second module (20) arranged on the first module and comprising the combustion chamber (21), a third module (30) arranged on the second module and comprising the heat exchanger, plus a fourth module (40) arranged on the third module and comprising the outlet channel (41) for fumes. In addition, the modules are gas-tight and can be attached in a removable manner by means of a flexible clamping joint acting between the first module (10) and the fourth module (40).

Description

Referring to the features, there is shown a preferred embodiment of the present invention. A heating stove for firing wood fiber pellets is made up of modules that are releasably arranged on top of each other.

The first module 10 comprises a us realm housing 11 and a fl realm 12 capable of providing a lunar current.

The second module 20 is arranged on the first module 10 and comprises a combustion chamber 21. The combustion chamber 21 is a standing cylindrical combustion chamber radially delimited by stainless steel plate 22. On the outside the delimiting plate 22 is arranged a heat-resistant insulating ceramic material 23 and on the outside the insulating material 23 is arranged an outer casing 24 of steel sheet.

An openable door 25 is arranged in the front edge of the combustion chamber. The door can, as in the example shown, advantageously be provided with a glass. The glass is intended to spread coziness by exposing the fireplace.

In the housing 11, which in this preferred embodiment is manufactured by casting in a gray iron material, grooves 14 are arranged for guiding receiving the second module 20. In the grooves a further sealing material can further advantageously be arranged which ensures a tight connection between the hard facing materials.

In the marriage house 11, at least one outlet 15 is also arranged for the air current forced by the marriage. The outlets 15 are arranged so that their mouths coincide with the inlet to ducts in the second module 20 controlling the air to the combustion chamber, partly as primary air at the burning bed and partly as secondary air to the flue gases above the bed.

The channels in the combustion chamber are formed by forming grooves in the insulating material 23 open against the boundary plate 22 of the chamber 21. By arranging holes in the boundary plate 22, the air is supplied to the combustion chamber at desired positions.

According to fi g. 2 shows that the pellet bed is intended to rest in a bowl 26, which also constitutes the lower boundary of the combustion chamber. The bottom of the bowl is perforated and the bowl 26 rests on the edge of a collar 16 extending from the housing.

In the uset housing 11, directly below the bottom of said bowl 26, an ignition unit 13 is arranged.

The ignition unit has an electric coil which, when heated, ignites the fuel in the bowl.

In the upward direction, the combustion chamber 21 is open to a third module 30. The third module receives the flue gases from the combustion chamber for the recovery of friend energy. The heat exchange can take place in the form of gas-to-gas or gas-to-liquid. In the embodiment shown, loops with separate ducts for flue gases and for air are indicated.

AB STOCKHOLMS PATENTBYRÅ, Zacco & Bruhn, Akt nr ll0038900 / TK C: \ WI'NDOWS \ TEM P \ l l0O38900-prioransankandoc 10 15 20 25 30 ~ 520 384 3 A fourth module, the top module 40, is arranged on the heat exchanger module 30. also be fully integrated with the heat exchanger module 30. The top module forms a cover for the heat exchanger module and it connects the flue gases to an outlet duct 41 for further transport to e.g. a chimney. The top module can advantageously be manufactured by casting, whereby grooves for directing receiving of the plate edges of the friend gear module can be easily adjusted.

In order to ensure a gas-tight connection between the dry-burning frame module 20 and the heat exchanger module 30, a sealing connection means 50 can advantageously be provided. 50 further has an opening 52 internally the innermost boundaries for the passage of flue gases from the module 20 to the module 30.

The disc made with grooves can advantageously be produced by casting in a chromium alloy gray iron material.

In the grooves 51, between the connecting member 50 and the plate edges (22; 24; 31; 32), a sealing material, preferably of a ceramic material, can advantageously be applied.

When the modules are in place, they must be releasably but still gas-tightly assembled, so that they can be separated if necessary for upgrading or replacing an individual module. According to the present embodiment, this is solved by placing the modules against each other, squeezing them together, by means of tension rods 60 extending between the two outermost modules.

The tie rods 60 are provided with threaded ends 61, which connect threaded nuts 62 which abut against ends 17, 42 at the outer modules clamping the modules together into a gas-tight unit. To allow for thermally influenced length variations, spring washers 63 are arranged between at least one nut 62 and associated fl as well as 17 per tie rod.

The length variation which can hereby be permitted while maintaining bias voltage within acceptable limits, i.e. without the bias voltage releasing and without the bias voltage becoming so great that cracks or other damage occurs to the modules. In the present exemplary embodiment, the drawbars are about 1000 mm and the expected dimensional variation is about 5 mm.

The modules are thus combined into one unit by means of a releasable elastically prestressed clamping connection. In the example shown, the joint consists of four tie rods distributed around the column of modules and acting between the two outermost modules. In the example shown, the spring washers are flat washers which are cup-shaped.

AB STOCKHOLMS PATENTBYRÅ, Zacco & Bruhn, Akt nr l l0038900 / TK C: \ WINDOWS \ TEMP \ 1 l0038900-prioransökandoc> ~ 520 384t 4 Every module type, e.g. the combustion chamber module, has connection surfaces with a specific profile. This Standardization enables both industrial production of the modules and interchangeability modularly in the event of defects or when more efficient technology is launched.

The temperatures that can be expected at different levels in the heating stove determine the choice of material in its components. The following rough distribution can be represented. In the pellet bowl 26 about 750 ° C, in the pre-combustion gases above the bed about 900 - 1000 ° C, and after the heat exchanger about 200 ° C. Thus, portions of the heating stove will change from room temperature, between the firing periods, to 1000 ° C at dri fi.

AB STOCKHOLMS PATENTBYRÅ, Zacco & Bruhn, Akt nr ll0038900 / TK C: \ WINDOWS \ TEMP \ I l0038900-prioransökamdoc

Claims (8)

10 15 20 25 30 e =,. . , r52O 384 5 Patent claim A heating stove comprising a combustion chamber and a heat exchanger for utilizing heat energy from flue gases, characterized in that the heating stove comprises modules arranged on each other releasably, a first module (10), a second module (20) arranged on the first module and comprising the combustion chamber ( 21), a third module (30) arranged on the second module and comprising the heat exchanger and a fourth module (40) arranged on the third module and comprising outlet duct (41) for flue gases and that the modules are gas-tight and releasably arranged by means of one between the first the module (10) and the fourth module (40) acting as an elastic clamping band comprising elastic means, arranged between the clamping band and at least one of the modules (10, 40), for forming elastic pretension of the chuck. 2. A heating stove according to claim 1, characterized in that the modules at their facing sides have a specific design for each side and module type. Heating stove according to Claim 2, characterized in that a sealing connecting member (50) is arranged between the second module (20) and the third module (30), having a disc shape which has module-specific grooves (51) on its main surfaces for receiving the end profile of each module. 4. A heating stove according to claim 3, characterized in that a string of a ceramic sealing material is arranged at the bottom of the grooves. Heating stove according to one of the preceding claims, characterized in that the clamping connection comprises elastically prestressed tie rods (60) and that at least three tie rods are arranged around the modules. 6. A heating stove according to claim 5, characterized in that the elastic means are arranged between at least one of the respective means of attachment of the drawbar and associated abutment at the module forming the elastic prestress of the drawbars. Heating stove according to one of the preceding claims 5 to 6, characterized in that the drawbar (60) has threaded ends (61) which connect nuts (62) which, via spring washers (63), abut against the first module (17) and the fourth, respectively. the module (42) clamping the mounting modules. Heating stove according to one of the preceding claims, characterized in that the second module (20) comprises a cylindrical combustion chamber (21) delimited by stainless steel (22), that externally the combustion chamber is provided with a ceramic material (23), that externally it the ceramic material is arranged an outer casing in sheet metal (24) and that »u u.,. U n t -. .. -.,. 'f-KZHI I' * ''. u Q ß a »| ~ Q, _ 'É' '^ ~ -. ...- _ 4 ducts for supply air are formed by grooves in the ceramic material and extending to holes in the stainless steel boundary.