FR2783688A1 - Water heater for coffee or tea percolator - Google Patents

Abstract

The heater consists of a container (1) with an outlet opening having a valve unit and a heater unit, whereby the valve unit opens and closes depending on the temperature of the water. The valve unit consists of a valve pin (2) held by means of a closing spring (5) and an opening spring consisting of a memory metal. On achieving a certain temperature, the opening spring is activated and overcomes the force of the closing spring to open the valve. The opening spring is deactivated on cooling down below a certain temperature.

Description

DESCRIPTION

  The present invention relates to a device for heating a liquid, in particular water, in particular

  for the preparation of coffee or tea, consisting of a receptacle

  liquid tackle with valve assembly and system

  heating, said valve assembly opening or closing

  mant depending on the water temperature.

  Devices of this kind are known in the state of the art. The liquid receptacle is a piece of

  aluminum die-cast, and is coated with polytetra-

  fluorethylene to prevent scaling and corrosion. The

  heating system is forced into the receptacle.

  The valve assembly is connected to said receptacle, a bimetallic actuator then opening the valve when a determined temperature prevails, and closing said valve during

  cooling below this temperature.

  In such devices, lime deposits often occur in the region of the valve, so that said valve loses its tightness and its function is thereby restricted. Hand cleaning is difficult. The valve adjustment stroke, which can be reached thanks to the bimetallic actuator, is so small that the circulation gap, formed for the flow of liquid when the valve is open, can

  be clogged with lime deposits.

  Based on this state of the art, the invention

  aims to provide a device of the type consi-

  déré, in which a blockage of the flow orifice,

  by deposits, to a large extent avoided.

  To achieve this object, the invention proposes that the valve assembly comprises a shutter slide

  held in closed position by means of a closing spring

  and an opening spring consisting of a metal alloy

  memory tank and activated when a determined temperature range of the heated liquid is reached, so that the valve opens by opposing the force of the closing spring, said opening spring being inactivated in the event of cooling in below said temperature range,

  so that said valve closes under the action of said res-

closing spell.

  This achievement allows a large re-run

  slipping of the valve, which has the effect of preventing

  flow hole patterns since a large opening, respectively a large gap, is

  cleared for flow.

  In addition, it is preferable that the re-

  this liquid container has a sealing seat formed in its bottom, preferably centrally; and that the bottom of said liquid receptacle extends obliquely and towards the

  down toward said shutter seat.

  Furthermore, it is preferably provided that the cost

  the shutter rod is housed in a casing which can be traversed by the contents of the water receptacle, said casing being provided with a base fixed removably at the bottom of said

liquid receptacle.

  The complete unitary assembly is thus easily demon-

table, for cleaning purposes.

  It is then preferably provided that the casing

  has, at its end turned away from the shutter seat

  ration, a first counter-stop plate providing support for the closing spring housed in said casing and taking

  support, by its second end, on a second counter

  stop which is rigidly mounted on the shutter slide

  and on which is supported, on the other hand, the spring of-

  verture leaning, by its second end, on a three-

  fifth counter-stop being integral with said casing and tra

poured by said slide.

  The closing spring is of relative realization-

  long and soft, to be able to obtain an elastic force

  as constant as possible. In the activated state, the opening spring is notably more powerful than said closing spring, the valve adjustment stroke obtained by said opening spring then being large enough to completely release the flow orifice. .

  In addition, it is preferable that the car-

  ter has, at its end turned away from the seat

  shutter, a guide pin projecting axially-

  in the direction of said obturation seat; and that the cost

  shutter bar present, in its end turned to

  opposite said shutter seat, a guide piece aff-

made to said pin.

  Preferably, it is then provided that the shutter slide is provided, at its end turned towards the shutter seat, with a beak protruding in the axial direction, said slide ending frusto-conically in the direction of said beak, said beak passing through the obturation seat in the closed position and the frustoconical surface being applied in a sealed manner against the corresponding surface of said

seat.

  This allows, when the valve is closed, a respective self-cleaning of the valve seat or

of the flow opening.

  In addition, it is preferably provided that the car-

  ter includes first orifices in the region of the

  fate of opening and second orifices in the region of

  closing spring, preferably in the upper part,

  to ensure that water flows without disturbance into said

casing, and so on.

  In addition, it is preferably provided that a

  liquid collecting bowl, by means of which liquid

  that spilled is directed towards the opening spring, either

  placed externally on the housing in the region of the

first holes.

  When, after heating the contents of the receptacle and flow of the hot liquid, said receptacle is again filled with fresh water in the cold state, the latter circulates

  directly, through the bowl, to the tank

  opening spell which cools immediately, is inactivated and ensures the closing of the valve by means of the closing spring In this case, preferably, provision is made for the base of the housing to be made in the manner of a cage presenting

  orifices which can be crossed by liquid.

  In addition, it is preferably provided that a lining

  silicone seal is located on the sealing seat

  tion and / or in the regions of the shutter slide which

  end in a frustoconical point.

  A silicone-based material prevents particular-

  deposit of lime or similar substances.

  Preferably, it is further provided that the re-

  this liquid container consists of fine steel.

  It is then preferably provided that the base of the housing is releasably fixed, in particular by a bayonet type system, in a recess made in the bottom of the water receptacle and provided, in its center, with

the orifice of said receptacle.

  In addition, it is preferably provided that the system

  electric heater is attached to the bottom below

  the latter being preferably reported by brazing.

  Preferably, it is further provided that the casing

  has liquid level markings on its outer wall

better.

  Thus, the housing is used for additional use.

  to hush up. Therefore, it is not necessary to spare

  an additional indication of the filling level.

  When the device is used, liquid is poured into the liquid receptacle, then heated by the electric heating system. The liquid reaches the casing through the first orifices made in the latter, towards the opening spring which opens the valve when the liquid has reached a determined temperature. The second orifices allow air to escape from the housing, so that no air bubble and no vacuum is formed in said housing, and that the liquid can rise without hindrance

  in said casing, or even out of it respectively.

  The closing spring keeps the shutter slide in the closed position. The flow orifice is hermetically sealed by the silicone seals placed in the obturation seat and in the regions of said slide which end in a truncated cone, so that the liquid remains in the receptacle. This realization has the result of avoiding lime deposits in the vicinity of the obturation seat and in the regions of the slide ending frusto-conically, which prevents, in this zone, a loss

  tightness of the valve due to lime deposits.

  When the liquid has reached a determined temperature range, the opening spring is activated and opposes the action of the closing spring, so that the shutter slide is lifted from the shutter seat by performing a large stroke of adjustment, and thus frees up completely

  the flow orifice. The orifices, made in the em-

  base of the housing designed like a cage, allow

  the flow of liquid through said casing.

  The bottom of the liquid receptacle, declining obliquely

  that in the direction of the valve, allows all of the liquid to exit the flow orifice. At the end of the liquid flow, the opening spring cools again in a short time, then is inactive, so that

  the closing spring pushes the slide again

  in the shutter seat, thereby closing the ori-

  flow. The slide beak, protruding axially-

  ment, passes through the flow opening in the closed position and eliminates any impurities which may be present there. If cold liquid is poured back into the

  receptacle, this liquid is directly directed to the reservoir

  opening fate by the collecting bowl. When said opening spring is not yet cooled, and the valve

  is not yet closed, said opening spring is re-

  cooled by the cold liquid and said valve is closed by

  the force of the closing spring. Solidarity liberated-

  ble from the base of the housing, with the bottom of the receptacle

  which allows easy removal of the entire valve assembly

  and therefore a simple elimination of possible damage.

limestone deposits or impurities.

  An embodiment of the invention is shown

  felt in the drawing and is described below in more detail

detailed.

  The single figure in the drawing is a front view, with

  section, of a device according to the invention.

  The drawing illustrates a device in accordance with the invention.

  tion, intended for heating a liquid.

  Said device consists of a receptacle 1 for liquid made of fine steel, of the cooking pot type open in the upper part, provided with a flow orifice made in the bottom and closable by a valve assembly, and with a heating system. electric 10 reported by brazing on the bottom, below the latter. The valve assembly comprises a shutter slide 2, held in the closed position by means of a closing spring 5, and an opening spring 3 consisting of a metal alloy with memory and activated when a determined temperature range is reached of

  liquid heated, so that the valve opens in opposition

  sant to the force of the closing spring 5, said opening spring being inactivated upon cooling below said temperature range, so that said valve

  closes under the action of said closing spring 5. The re-

  ceptacle 1 has a shutter seat 11 arranged centrally

  Lely at its bottom, at the level of the flow orifice, said bottom of the receptacle 1 extending obliquely and towards the

down towards said seat 11.

  The shutter slide 2 is housed in a casing 4

  can be traversed by the contents of receptacle 1 to li-

  what. The casing 4 has liquid level markings on its outer wall, said casing 4 being provided with a

  base 14 removably attached to the bottom of the receptacle 1. The em-

  base 14 is locked, by a bayonet type system, in a recess made in the bottom of the receptacle 1, said recess being provided, in its center, with the orifice 7

of said receptacle 1.

  At its end turned away from the shutter seat

  tion 11, the casing 4 has a first counter plate

  stop 12 providing support for the closing spring 5 housed

  in said casing 4 and bearing, by its second end

  mite, on a second counter-stop 13 which forms an integral part

  groove of the shutter slide 2 and on which is supported, on the other hand, the opening spring 3 resting, by its second end, on a third counter-stop 15 integral with the casing and traversed, possibly with clearance , by said shutter slide 2. At its end turned away from the shutter seat 11, the casing 4 comprises a guide pin 8 projecting axially in the direction of said seat 11, and the slide 2 has, in its turned end opposite said seat 11, a

  guide piece 9 assigned to said pin 8.

  At its end facing the shutter seat

  11, the shutter slide 2 is provided with a spout 16

  axially, said slider 2 ending in frustoconical-

in the direction of said spout 16.

  The spout 16 passes through the obturation seat 11 in posi-

  closure and the surface of the truncated cone is applied

  quée, in a sealed way, against the corresponding surface

said seat.

  The casing 4 comprises first orifices 17 in the region of the opening spring 3, and second orifices 18

  in the upper region of the closing spring 5.

  A liquid collecting bowl 6 occupies a posi-

  external tion on the casing 4, in the region of the first orifices 17, cup by means of which spilled liquid is directed towards the opening spring 3. The base 14 of the casing 4 is produced in the manner of a cage having of

  orifices which can be crossed by liquid. A garnish

  The silicone sealing structure is arranged on the obturation seat and in the regions of the obturator slide 2 which end in a frustoconical point.

  The invention is not limited to the embodiment example

  above, but can undergo many modifications.

  in the context of this presentation.

  All of the new features, disclosed

  dividually and in combination in the description and / or

  in the drawing, are considered to have a character

inventive essential.

Claims (14)

-R E V E N D I C A T I ON S-   1. Device for heating a liquid, in particular   bind water, especially for preparing coffee or tea, consisting of a liquid receptacle provided with a system   heater and a drain opening associated with a   appears to have a valve, said valve assembly releasing or closing   mant the flow opening as a function of the water temperature, device characterized in that the valve assembly comprises a shutter slide (2) held in the closed position by means of a closing spring (5) , and   an opening spring (3) consisting of a metallic alloy   only with memory and activated when a determined temperature range of the heated liquid is reached, so that the   valve opens by opposing the force of the iron spring   method (5), said opening spring being inactivated in the event of cooling below said temperature range,   so that said valve closes under the action of said res- closing spell (5).   2. Device according to claim 1, characterized in that the receptacle (1) for liquid has a closure seat (11) formed in its bottom, preferably centrally; and by the fact that the bottom of said liquid receptacle extends obliquely and towards the. down towards said shutter seat.   3. Device according to claim 1 and / or 2, ca-   characterized by the fact that the shutter slide (2) is housed in a casing (4) which can be traversed by the contents   of the liquid receptacle, said casing being provided with a   base (14) removably attached to the bottom of said liquid receptacle (1). 4. Device according to claim 3, characterized   by the fact that the casing (4) has, at its turn end-   born opposite the shutter seat (11), a first   as counter-stop (12) providing support for the iron spring   frame (5) housed in said casing (4) and bearing, by its second end, on a second counter-stop (13) which is rigidly mounted on the shutter slide (2) and   on which is supported, on the other hand, the opening spring   ture (3) supported, by its second end, on a three-   fifth counter-stop (15) integral with said casing and   crossed by said slide (2).   5. Device according to claim 3 or 4, character-   laughed at by the fact that the casing (4) comprises, at its end opposite the obturation seat (11), a guide pin (8) projecting axially in the direction of said   shutter seat; and by the fact that the slide obturates   rateur (2) present, in its opposite end   said shutter seat (11), a guide piece (9) aff- made to said pin (8).   6. Device according to any one of the claims.   tions 2 to 5, characterized in that the slide obturates   rateur (2) is provided, at its end facing the shutter seat (11), with a spout (16) projecting in the axial direction, said slide (2) ending frusto-conically in the direction of said spout (16) , said spout (16) passing through the closure seat (11) in the closed position and the frustoconical surface being applied, in a sealed manner, against the   corresponding surface of said seat.   7. Device according to any one of the claims.   tions 3 to 6, characterized in that the casing (4) comprises   takes first holes (17) in the region of the opening spring (3) and second holes (18) in the region   of the closing spring (5), preferably in the upper part.   8. Device according to claim 7, characterized in that a bowl (6) collecting the liquid,   means by which spilled liquid is directed to the reservoir   opening spell (3), is placed externally on the   ter (4) in the region of the first orifices (17).   9. Device according to any one of the claims.   tions 3 to 8, characterized in that the base (14) of the housing (4) is produced in the manner of a cage having   orifices which can be crossed by liquid.   10. Device according to any one of the claims.   tions 2 to 9, characterized in that a lining   silicone seal is located on the sealing seat   tion (11) and possibly, or alternatively, in the regions of the shutter slide (2) which end in a frustoconical tip.   11. Device according to any one of the claims.   1 to 10, characterized in that the receptacle (1)   to liquid consists of fine steel.   12. Device according to any one of the claims.   tions 3 to 11, characterized in that the base (14) of the casing (4) is releasably fixed, in particular by a bayonet type system, in a recess made in the bottom of the receptacle (1) for liquid and endowed, in its center,   orifice (7) of said receptacle (1).   13. Device according to any one of the claims.   1 to 12, characterized in that the electric heating system (10) is fixed to the bottom below this   the latter being preferably reported by brazing.   14. Device according to any one of the claims.   tions 3 to 13, characterized in that the housing (4) comprises   has liquid level markings on its outer wall better.