• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The present invention relates to a heating assembly of an electric water heater, comprising an insulating fitting (1) for a sacrificial anode (A) suitable for the protection against corrosion of the tank (S) of said electric water heater. Said insulating fitting (1) comprises an external part (2) of plastic material and an insert (3) of metal material, partially inserted in said outer part (2). Such insulating fitting (1) is preferably made by co-moulding and has the function of electrically insulating said anode (A) from the support flange (FO) whereon it is fixed and placing it in electrical contact with the closing flange (FA) of said tank (S).
    公开号:ES2874153A2
    申请号:ES202190019
    申请日:2019-09-11
    公开日:2021-11-04
    发明作者:Stefano Ferroni；Renato Moreci
    申请人:Ariston Thermo SpA；
    IPC主号:
    专利说明:

    [0002] Insulating fixing medium for a magnesium anode of an electric water heater
    [0004] The object of the present invention is a heating assembly for an electric water heater comprising insulating fixing means for an anode intended to provide corrosion protection to the metal tank of said electric water heater.
    [0006] More particularly, the invention falls within the field of electric tank water heaters or boilers for which the corrosion to which the internal surface of the storage tank is subjected constitutes a serious problem. For this purpose, a cathodic protection device has been known for a long time, represented by a passive sacrificial anode, the purpose of which is to counteract said corrosion process caused by the exchange of ions between the water and the metal alloy of the tank.
    [0008] The passive sacrificial anode (hereinafter abbreviated as "anode") is normally made of magnesium (or an alloy thereof) with an electrochemical potential significantly lower than that of the steel tank walls, which consequently acts as a a cathode.
    [0010] Said anode generally finds support on the same tank flange that supports other functional elements of the water heater. Those skilled in the art are well aware of the structure or arrangement of said group of elements, but the characteristics thereof are described below in order to explain the present invention and its scope of application.
    [0012] The following components are assembled and fixed to said flange (whose purpose is to close the opening made in the water heater tank):
    [0014] - The heating element, represented by one or more electrical resistances, suitable to be immersed in the water that will be heated and stored,
    [0015] - The thermoregulation and / or thermo-protection thermostat sheath, equipped with one or more temperature sensors.
    [0016] - The mentioned anti-corrosion anode.
    [0017] Hereinafter, in this description, the term "heating assembly" will refer to the entire assembly of elements listed above, suitable for heating and protecting.
    [0019] In the best performing models of electric tank water heaters, heating elements are usually provided made of a more noble metallic material and with better corrosion resistance characteristics and higher electrochemical potential than the heating element materials commonly used for electric water heaters.
    [0021] In this case, the undesired phenomenon is observed that the functional characteristics of the anode act in favor of said heating element, instead of with respect to the walls of the metal tank, given the lower electrochemical potential of the tank with respect to the potential of said heating element. . In other words, the flow of electrons from the anode migrates to said heating element instead of going to protect the metal walls of the storage tank.
    [0023] The object of the present invention is to obviate said type of drawbacks by providing a heating assembly that has special means to isolate the anode from the heating element, in such a way that the anticorrosive properties of said anode are correctly directed to the tank of the reservoir water heater.
    [0025] Another objective is to indicate suitable means for fixing said anode to the heater assembly without damaging the mechanical seal or the hydraulic seal of the elements supported by said heater assembly.
    [0027] These and other objects, which will appear clearly below, are achieved with a heater assembly according to claim 1.
    [0029] Other objects may also be achieved through the additional features indicated in the dependent claims.
    [0031] Other features of the present invention will be better highlighted from the following description of a preferred embodiment, in accordance with the patent claims and illustrated purely by way of example and not limitation, in the attached drawing tables, in which:
    [0032] - Fig. 1 shows an exploded view of the heater assembly according to the invention;
    [0033] - Fig. 2.A illustrates the heater assembly of Fig. 1, according to a side sectional view;
    [0034] - Fig. 2.B is an enlargement of Fig. 2.A, in order to show a detail of the heating assembly according to the invention;
    [0035] - Fig. 3.A illustrates the insulating accessory of the heater assembly according to the invention;
    [0036] - Fig. 3.B shows a section of the insulating accessory of the heater assembly according to the invention.
    [0038] The characteristics of a preferred variant of the heater assembly will be described below with reference to the figures. It is noted that the aforementioned figures, although they are schematic, reproduce the elements of the invention according to proportions between their spatial dimensions and orientations compatible with a possible embodiment.
    [0040] Figure 1 shows the entire heater assembly according to the invention, described with its components disassembled, for clarity of description.
    [0042] According to the present invention, said heating assembly comprises:
    [0043] - a flange FA, preferably made of galvanized steel, suitable to act as a closing element for the hole made in the tank S and to support all the other components (hereinafter, said flange FA will be defined as a "closing flange FA" ); - a flange FO, preferably made of brass, located above said closing flange FA and electrically insulated from it by means of a GD dielectric annular gasket, also intended to prevent any water leakage to the outside of the tank S (hereinafter, said FO flange will be defined as a "FO support flange");
    [0044] - at least one heating element R represented by a standard electrical resistance, the lower ends of which are located in the special collars C obtained from said support flange FO;
    [0045] - a thermostat sheath G, also attached to said support flange FO by fixing a special collar;
    [0046] - an anode A, whose lower end GA (hereinafter called "stem GA") is supported by said support flange FO by means of the insulating accessory 1, object of the present invention.
    [0048] The reference V indicates a suitable connecting screw for the assembly of the entire heating assembly, that is, to fix the steel closing flange FA to the overlying support flange FO, with the interposition of an insulating sleeve (indicated with reference B) made of plastic material for the reciprocal electrical insulation between said two flanges FA, FO.
    [0050] As indicated before, the support FO flange (on which the heating element R, the thermostat sleeve G and the anode A are mounted) is preferably made of brass, a material that has proven to be suitable, thanks to its characteristics of malleability and functionality, to allow the ends of said heating element R and sheath G to be fixed to the collars C, by brazing with deposition of a tin solder alloy or by using an adhesive resin (for example, a mono epoxy resin component to undergo a hardening catalyst step as required).
    [0052] According to the invention, the heating element R is preferably made of titanium or its alloys, while the anode A is preferably made of magnesium or its alloys. As already mentioned, it is necessary that said two components be electrically insulated, since otherwise said anode A would act as an anti-corrosion device for the heating element R, rather than for the tank S of the water heater: the object is It is achieved thanks to the insulating accessory 1, described in more detail shortly, to which this anode A is dielectrically fixed on the support flange FO.
    [0054] In Fig. 2.A and in the enlargement of Fig. 2.B, the heating assembly described above is illustrated with its elements already assembled, including said insulating accessory 1, which acts as a dielectric connector for the anode A with respect to the support flange FO.
    [0056] In Figs. 3.A and 3.B only the insulating accessory 1 is represented, which comprises an external part 2 of plastic material and an insert 3 of metal material, partially inserted in said external part 2.
    [0057] More specifically, said external part 2 is preferably made of polyphenylene sulfide (PPS), for example, fortron®, a polymer with high thermal performance, capable of withstanding temperatures in the order of 300 ° C.
    [0059] By means of known technologies, such as co-molding, said external part 2 made of plastic material incorporates part of the metal insert 3, preferably brass.
    [0061] As illustrated in Figs. 3.A and 3.B, said insulating accessory 1 therefore comprises:
    [0063] - an upper part represented by the upper end 3.2 of the metal insert 3 projecting from the plastic part 2; said upper part comprises a cavity 3.1 that acts as a base for the insertion of the rod GA of the anode A;
    [0064] - a middle part represented by said external plastic part 2, subdivided into an upper part 2.1 (which incorporates part of the upper end of the metal insert 3) which is in the form of a hexagonal nut and into a threaded lower part 2.2, which has a diameter more smaller than said upper part 2.1 and incorporating a first section of the stem 3.3 of said insert 3;
    [0065] - a pedical part represented by the lower end 3.3 (hereinafter "stem 3.3") of said metallic insert 3, which projects from the threaded lower part 2.2 of said external plastic part 2.
    [0067] A circumferential base 2.OR is collected between the upper part 2.1 and the lower part 2.2 of said external plastic part 2, to place an annular OR gasket, for example, of the type of an OR O-ring: said OR O-ring acts as a hydraulic seal against the FO support flange to which the insulating fitting 1 is bolted.
    [0069] The detail in Fig. 2.B is useful to clarify the dielectric function of the insulating accessory 1.
    [0071] Once the rod GA of the anode A is placed in the cavity 3.1 of said insulating accessory 1, it is screwed to a special hole in the support flange FO by means of the lower threaded part 2.2. from its external plastic part 2, acting on the upper part 2.1 which is shaped like a hexagonal nut.
    [0073] The anode A is therefore completely electrically isolated from said support flange FO (and, consequently, from the heating element R fixed to said flange FO), since the contact of the insulating accessory 1 with said support flange FO occurs only through the lower threaded part 2.2 of the external plastic part 2 thereof.
    [0075] Said anode A, on the other hand, is electrically in contact with the underlying closing flange FA (and, therefore, with the tank S to which said FA is screwed and with respect to which said anode A has the task of exerting its properties anticorrosion) through the stem 3.3 of the metallic insert 3, which extends upwards to said closing flange FA and to which it is fixed and placed in contact by means of a metallic nut V2 and the washer V1, respectively.
    [0077] As described before, the electrical insulation between the two flanges FA, FO is protected both by the dielectric annular gasket GD and by the insulating sleeve B made of plastic material, interposed to the connecting screw V of the entire heating assembly.
    [0079] From the above description, the advantages that can be achieved with the heating assembly according to the invention are clear, the main of which refers to the possibility of ensuring that the anode A fulfills its function of anticorrosion protection of the tank S and not with respect to the heating element R, since it is electrically insulated with respect to the support flange FO and, consequently, with respect to said heating element R.
    [0081] It is clear that the various variants of the heating assembly and of the insulating accessory 1 described above are possible for the person skilled in the art, without deviating from the scope of the novelty of the inventive idea, as it is also clear that, in a practical realization of In the invention, the various components described above can be replaced by other technically equivalent ones.
    [0083] For example, in the figures and in the description, a variant of the insulating accessory 1 is shown in which the upper part 2.1 of the external plastic part 2 is made in the form of a hexagonal nut, in order to facilitate screwing with tools. standard to the FO support flange by means of the threaded lower section 2.2: however, it is also possible that said upper part 2.1 has a different shape, such as the lower part 2.1 which may not have a thread, which can also be fixed to said flange of FO support by different methods and means.
    [0084] In the same way, in a preferred embodiment of the invention, the heating element R is made of titanium (or an alloy of this) while the anode A is made of magnesium (or an alloy of this): however, it can be arranged the use of different metallic materials, with chemical characteristics that produce electrochemical phenomena similar to those achieved with titanium and magnesium.
    权利要求:
    Claims (12)
    [1]
    1. Heating assembly of an electric water heater comprising at least:
    - a metal closing flange (FA) for a tank (S) of said electric water heater,
    - a metal support flange (FO), located above said closing flange (FA) and electrically isolated from it,
    - at least one heating element (R) fixed to said support flange (FO),
    - a sacrificial anode (A) to protect against corrosion of the metal walls of said tank (S),
    characterized because,
    It comprises an insulating accessory (1) adapted for the dielectric fixation of said anode (A) to said support flange (FO), said insulating accessory (1) comprises an external part (2) of plastic material within which it is partially incorporated an insert (3) made of metallic material,
    said external part (2) of plastic material is the only part that is in contact with said support flange (FO),
    said insert (3) of metallic material is the only part that is in contact with said anode (A) and said closing flange (FA),
    said insulating accessory (1) comprises:
    - an upper part consisting of the upper end (3.2) of said insert (3) of metallic material, which projects from said external part (2) of plastic material and which comprises a cavity (3.1) for inserting the stem ( GA) of said anode (A), - a middle part consisting of said external part (2) of plastic material, comprising an upper part (2.1) that incorporates part of the upper end of said insert (3) of metallic material and a lower part (2.2), with a smaller diameter than said upper part (2.1), which incorporates a first section of the stem (3.3) of said insert (3) made of metallic material,
    - a pedical part consisting of the stem (3.3) of said insert (3) of metallic material, which projects from said lower part (2.2) of the external part (2) of plastic material,
    - a circumferential base (2.OR) for an annular joint (OR), which is obtained between said upper (2.1) and lower (2.2) parts of said external part (2) made of plastic material.
    [2]
    2. Heater assembly according to the preceding claim,
    characterized because,
    said closing (FA) and support (FO) flanges are reciprocally and electrically isolated by a dielectric joint (GD) and an insulating sleeve (B) of plastic material interposed to a union screw (V) arranged between said closing flanges (FA) and support (FO).
    [3]
    Heating assembly according to any of the preceding claims, characterized in that,
    said anode (A) is made of magnesium and its alloys, while said heating element R is made of titanium or its alloys.
    [4]
    4. Heating assembly according to any of the preceding claims, characterized in that,
    said support flange (FO) is made of brass, while said closing flange (FA) is made of galvanized steel.
    [5]
    5. Heater assembly according to any of the preceding claims, characterized in that,
    furthermore, it comprises a sheath (G) for a thermostat, which is fixed to said support flange (FO).
    [6]
    6. Heater assembly according to any of the preceding claims, characterized in that,
    said stem (3.3) of said insert (3) of metallic material is fixed to the closing flange (FA) with a nut (V2) and in contact with it by means of a mechanical washer (V1), which ensures the mechanical contact between said anode (A) and said closing flange (FA).
    [7]
    7. Heater assembly according to any of the preceding claims, characterized in that,
    said upper part (2.1) of said external part (2) of plastic material of said insulating accessory (1) is in the form of a hexagonal nut.
    [8]
    Heating assembly according to any of the preceding claims, characterized in that,
    said lower part (2.2) of said external part (2) of plastic material of said insulating accessory (1) is threaded to be screwed to a hole in the support flange (FO).
    [9]
    Heating assembly according to any of the preceding claims, characterized in that,
    said insulating accessory (1) is obtained by co-molding said external part (2) of plastic material to said insert (3) of metallic material.
    [10]
    Heating assembly according to any of the preceding claims, characterized in that,
    said external part (2) of plastic material of said insulating accessory (1) is made of polyphenylene sulfide PPS, for example, fortron ®.
    [11]
    Heating assembly according to any of the preceding claims, characterized in that,
    said insert (3) of metallic material of said insulating accessory (1) is made of brass.
    [12]
    12. Electric water heater, characterized in that it comprises the heating assembly according to claims 1 to 11.
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    同族专利:
    公开号 | 公开日
    WO2020065390A1|2020-04-02|
    ES2874153R1|2021-11-05|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    IL78015D0|1986-03-03|1986-07-31|Avraham Shapira|Electric water heater with a rapid-heating arrangement|
    US4975560A|1989-09-06|1990-12-04|A.O. Smith Corporation|Apparatus for powering the corrosion protection system in an electric water heater|
    ITAN20020057A1|2002-11-27|2004-05-28|Merloni Termosanitari Spa Ora Ariston Thermo Spa|AI SENSITIVE IMPRESSED CURRENT DEVICE|
    EP1431420A1|2002-12-19|2004-06-23|A.Georgios Tsagadas|Sensor that detects the deterioration of sacrificial Anodes used for protection against erosion.|
    ITAN20050037A1|2005-07-20|2007-01-21|Merloni Termosanitari Spa|STORAGE WATER HEATER WITH ADJUSTABLE CATHODIC PROTECTION|
    CN203320128U|2013-05-14|2013-12-04|青岛经济技术开发区海尔热水器有限公司|Anode bar consumption detection prompter and water heater|
    法律状态:
    2021-11-05| EC2A| Search report published|Ref document number: 2874153 Country of ref document: ES Kind code of ref document: R1 Effective date: 20211028 |
    优先权:
    申请号 | 申请日 | 专利标题
    IT201800009038|2018-09-28|
    PCT/IB2019/000754|WO2020065390A1|2018-09-28|2019-09-11|Insulating fixing means for a magnesium anode of an electric water heater|
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