Burner cover insulation device for a boiler and method for manufacturing such a device

An insulation device for shielding a cover plate of a burner housing from heat produced by a boiler burner inside the burner housing, wherein the cover plate seals an access opening provided in the burner housing and the boiler burner protrudes inside the burner housing, the insulation device forming a unit that is separate from the cover plate and comprising:

• a cover layer comprising a flexible layer of heat resistant inorganic fibers and having a first outer peripheral edge;
• a support layer providing mechanical strength to the device and having a second outer peripheral edge that at least extends to the outer peripheral edge of the cover layer, and
• a filling material forming an insulating layer between the cover layer and the support layer;
• wherein a through hole extends through the cover layer and the support layer thereby forming a first inner peripheral edge of the cover layer and a second inner peripheral edge of the support layer, wherein the through hole is at least delimited by the first inner peripheral edge of the cover layer, and wherein the cover layer and the support layer are connected along at least part of the first outer peripheral edge of the cover layer and at least part of the second inner peripheral edge of the support layer,
• wherein the insulating layer, located between the cover layer and the support layer, has a third outer and a third inner peripheral edge, the insulating layer extending from the first inner peripheral edge of the cover layer to the first outer peripheral edge of the cover layer, and wherein the through hole is delimited by the first and third inner peripheral edges of the cover layer and the insulating layer, respectively, and
• wherein the first and third inner peripheral edges extend over the second inner peripheral edge of the support layer, thereby forming a recess for accommodating at least part of the boiler burner, the recess extending from the second inner peripheral edge to the first inner peripheral edge, and wherein the layers are connected along at least part of the first outer peripheral edge of the cover layer and the second inner peripheral edge of the support layer.