DE60105123T2 - Composite boiler - Google Patents

Abstract

The invention falls into the field of boilers made of polymeric matrix composite materials. The said boiler is constituted of two layers composed, in order from the inside to the outside, of a first layer (4) made of thermoplastic or elastomeric matrix material, and a second layer (5) composed of a plurality of filaments or strips of a synthetic material covered with resins which agglomerate by means of reticulation or fusion. The said first laser is built as a single body and is designed to come into direct contact with the water and the said second layer is also built as a single body and is designed to create structural resistance for the said boiler.

Description

technical area

The The invention relates to a boiler made of a polymer matrix composite material, especially in a water heater.

technical background

since For some time, the applicant has become increasingly interested in the use of synthetic ones Polymer matrix materials as suitable materials for the production of components for receiving water for sanitary purposes, which is either heated by gas or electricity, interested. This Interest is growing out of a number of advantages that these materials compare with metallic materials that have been used so far.

One first disadvantage of metal boilers, traditionally used in water heaters be, consists in the phenomenon the electrolytic corrosion that occurs in the interior surfaces of the Boiler occurs. To the occurring electrolytic corrosion To counteract protection systems are used, such as the application of suitable internal panels or suitable Sacrificial anodes or imprinted Current anodes.

One Another disadvantage of the conventional Metal kettles are the negative environmental effects that during the Production phase through the use of chemical substances to prepare the metal surfaces be caused.

One Another disadvantage is the short life of the conventional Metal kettle.

At the Choose The materials have been used in the designs proposed to date for the Manufacture of synthetic material boilers for water heaters in general Materials with special mechanical features and special Forms for structural reinforcement proposed.

The International Patent Application PCT / IT 97/00186 examines z. B. the use of alloy polymer materials with others technical polymers are modified, since the materials are a positive have mechanical stress resistance behavior, which also by the addition of reinforcements is reached.

The International patent application PCT / EP 98/07982 proposes a Way to achieve a remarkable mechanical resistance behavior a boiler for water heaters made of a synthetic material with structural reinforcing ribs in front.

In both mentioned Inventions, the boiler used by means of a joining of two or more components by welding or with the help of adhesives produced. These solutions, which are structurally weak, require appropriate adjustments to ensure that the operating conditions of the item no potentially dangerous Situations for the user due to under certain conditions within the Boiler during the heating process resulting pressure or if the water in the Boiler is stored, cause.

epiphany the invention

One The first object of this invention is to produce a Boiler made of a synthetic polymer material as a one-piece body without to allow a structurally weak construction.

One second objective of the relevant boiler in this invention in that the production costs are similar to those of a boiler are made of metal with an identical capacity.

Further Goals are the simplicity with which the components are recycled can be, and from a guaranteed life of at least 10 years.

Farther become the targets with the least possible impairment the environment during the Production phase and with the lowest possible energy consumption both while the production phase as well as during the operation of the water heater, which is equipped with the boiler, achieves the energy consumption when operating is very low compared with other market Water heaters.

• – die erste Schicht aus einem Elastomermaterial bestehen kann;
• – die zweite Schicht aus einer Vielzahl von synthetischen Fäden oder Streifen besteht, die um die erste Schicht gewickelt sind, wobei die besagten Fäden oder Streifen mit Harzen beschichtet sind, die durch Vernetzung oder Fusion agglomerieren; wobei die besagte Schicht aus einem einzigen Körper besteht, um die strukturelle Widerstandsfähigkeit des Heizkessels zu schaffen.
• – wobei die erste und zweite Schicht bei der Entsorgung des besagten Heizkessel voneinander trennbar sind, wobei die Entsorgung das Recycling des Heizkessels am Ende seiner Lebensdauer gestattet.

The boiler of the present invention in particular for use in a water heater equipped with a heating element and preferably but not exclusively electrically operated and made entirely of a polymer matrix composite material comprising a first layer of plastic material whose properties it provides make the contact with water suitable for sanitary purposes, and a second layer of composite material of high tensile strength fibers, characterized by the fact that:

• - The first layer may consist of an elastomeric material;
• The second layer consists of a multiplicity of synthetic threads or strips wound around the first layer, the said Threads or strips are coated with resins which agglomerate by cross-linking or fusion; said layer consisting of a single body to provide the structural integrity of the boiler.
• - Wherein the first and second layers are separable from each other in the disposal of the said boiler, the disposal allows the recycling of the boiler at the end of its life.

These or other properties will become apparent from the description below a preferred embodiment of the invention, by way of example with the accompanying drawings is provided, in which:

1 shows a boiler, which is inserted in an electric water heater;

2 shows schematically and not to scale a section of the boiler; with reference to 1 the reference number 1 is used to designate a water heater in which a boiler 2 is used.

Inside the boiler 2 there is a heating element 3 of electrical type.

In 2 denotes the number 4 a first layer, which comes into direct contact with the hot water or the water to be heated, and the number 5 denotes a second layer that is outside the first one.

The first shift 4 is made of a thermoplastic matrix material composed of poly-olefin, homopolymer, copolymer, metal-o-phenolic or PET-based resins or PPE / PPO-based resins and the like, a mixture of other compatible polymeric materials or those that are made compatible with each other, both semicrystalline and also amorphous exists.

The first shift 4 may also be made of an elastomeric matrix material consisting of PB or PIB based resins and the like, a mixture with other compatible polymers or those which have been made compatible, both semi-crystalline and amorphous.

The two layers 4 and 5 that are in a single body are completely detachable from each other.

A layer 6 of the water heater 1 that the boiler 2 is placed around the outside of the boiler and designed to provide a thermal insulation for the boiler; where layer 6 from the outer surface of the second layer 5 is solvable.

One first advantage of the relevant boiler in the present Invention is that the second layer to provide of the necessary structural resistance for the boiler is, at least in the heated state an explosion resistance of not less than 30 bar at 70 ° C and a Number of mechanical fatigue cycles from 1 to 8 bar of more than 20,000 ensures by the specific safety standards are required.

One second advantage is the fact that the manufacturing cost of the boiler according to the present Invention substantially identical to those of a boiler with same capacity are, and the complete made of metal.

One Another advantage is the simplicity with which the individual Components in disassembled state or the entire corresponding Boiler unit of this invention can be recycled.

One Another advantage is the low environmental impact during the Production phase and the energy intake during both the production phase and when operating the boiler, which is very low compared to other products available on the market today.

Other Benefits consist in the physical ease of the unit and the absence of any element that causes corrosion in the inner surface of the boiler should prevent.

Finally has the boiler according to the present Invention has the further advantage that its heat generation levels as well like his mechanical performance not less than those of Metallheizkesseln.

A See further embodiment not shown the application of a layer consisting of a variety of synthetic Threads or Strip made of synthetic material coated with resins They are characterized by networking or fusion outside the boiler Polymer material agglomerate for use particularly in a water heater equipped with a heating element is equipped, but preferably not exclusively is electrically operated and characterized by the fact is that it consists of two or more elements, by welding, gluing or another method is composed with each other.

The coating is merged on the put elements in the fully assembled state.

The Layer and the boiler, which after the complete assembly of the two or more elements has been produced, are put together, that they are complete can be separated from each other.

In This description is made to a water heater, in which the Heating boiler according to the present Invention is used, but of course the boiler can also advantageously in different applications of the water heater be used.

Claims (9)

Boiler ( 2 ), especially for use in a water heater equipped with resistance ( 3 ), preferably, but not exclusively, electrically, and made entirely of a polymer matrix composite material having a first layer ( 4 ) made of plastic material whose properties make it suitable for contact with water for sanitary purposes, and a second layer ( 5 ) made of composite material of high tensile strength fibers, characterized by the fact that: - the first layer ( 4 ) may consist of an elastomeric material; The second layer ( 5 ) consists of a multiplicity of synthetic threads or strips which surround the first layer ( 4 ), said threads or strips being coated with resins which agglomerate by cross-linking or fusion; the said second layer consists of a single body to increase the structural resistance of the boiler ( 2 ) to accomplish; said first and second layers may be separated when the said boiler is disposed of, said disposal permitting recycling of the boiler at the end of its lifetime. Heating boiler according to claim 1, characterized by the fact that the material of thermoplastic matrix from which the first layer ( 4 ) can be made of polyolefin resins, homopolymer resins, copolymer resins, metallocene resins or resins based on PET, PPE / PPO or other mixtures of other compatible polymer materials or semicrystalline or amorphous materials, or materials which have been made compatible; the choice of these thermoplastic matrix thermoplastic materials depends on their resistance, especially on the heat resistance of the first layer ( 4 ) must have. A heating boiler according to claim 1, characterized by the fact that the elastomeric material from which the first layer ( 4 ) can be made of a PB, PIB based resin or other mixtures of other compatible polymer materials or semicrystalline or amorphous materials, or materials which are made compatible; the choice of these thermoplastic matrix thermoplastic materials depends on their resistance, especially on the heat resistance of the first layer ( 4 ) must have. A boiler according to claims 1, 2 and 3, characterized by the fact that the material of the first layer ( 4 ), which comes into direct contact with the water, has a high degree of resistance to thermal expansion and cyclic mechanical deformation due to the pressure of the water. Heating boiler according to claim 1, characterized by the fact that the threads or strips of the second layer ( 5 ) may consist of glass fibers, carbon or a type of fabric. A heating boiler according to claims 1 and 5, characterized by the fact that the resin coating consisting of threads or strips of synthetic material, the second layer ( 5 ) consists of a pre-impregnation; the said resins used for the preimpregnation may be both thermosetting resins and thermoplastic matrix resins having suitable fusion points; the choice of said resin depends on the mechanical and thermal resistance that the second layer must have ( 5 ). A boiler according to claims 1, 5 and 6, characterized by the fact that the plurality of threads or strips of synthetic material are applied in accordance with the technology, the project and the strength required for the boiler ( 2 ) are most suitable; For example, depending on the technology, the project and the warm strength, said boiler can achieve explosion-proof values of 38 bar at 70 ° C and a number of fatigue cycles due to variations in water pressure that are greater than 1-6 bar Million lie. Heating boiler according to claim 1, characterized by the fact that a layer ( 6 ) of the water heater ( 1 ), the boiler ( 2 ) used in this water heater to ensure the thermal insulation of said boiler, outside of said second layer ( 5 ) of said boiler is positioned and can be separated from said second layer; the fact of separability serves the purpose of complete dismantling of the boiler ( 2 ) if it has to be reused at the end of its lifetime. Boiler according to the preceding claims, characterized by the fact that the first layer ( 4 ) may consist of two or more components that are joined together by welding, glue or other system.