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WO2017144996A1 - Valve pour distribution d'infusion avec une mousse pour machine à café de type moka, et machine à café comprenant ladite valve - Google Patents

Valve pour distribution d'infusion avec une mousse pour machine à café de type moka, et machine à café comprenant ladite valve Download PDF

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Publication number
WO2017144996A1
WO2017144996A1 PCT/IB2017/050778 IB2017050778W WO2017144996A1 WO 2017144996 A1 WO2017144996 A1 WO 2017144996A1 IB 2017050778 W IB2017050778 W IB 2017050778W WO 2017144996 A1 WO2017144996 A1 WO 2017144996A1
Authority
WO
WIPO (PCT)
Prior art keywords
infusion
valve
shutter body
opening
shutter
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/IB2017/050778
Other languages
English (en)
Inventor
Moreno Balzani
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mokha' Srl
Original Assignee
Mokha' Srl
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mokha' Srl filed Critical Mokha' Srl
Publication of WO2017144996A1 publication Critical patent/WO2017144996A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
    • A47J31/00—Apparatus for making beverages
    • A47J31/24—Coffee-making apparatus in which hot water is passed through the filter under pressure, i.e. in which the coffee grounds are extracted under pressure
    • A47J31/30—Coffee-making apparatus in which hot water is passed through the filter under pressure, i.e. in which the coffee grounds are extracted under pressure with hot water under steam pressure
    • A47J31/303—Coffee-making apparatus in which hot water is passed through the filter under pressure, i.e. in which the coffee grounds are extracted under pressure with hot water under steam pressure classical type of espresso apparatus, e.g. to put on a stove, i.e. in which the water is heated in a lower, sealed boiling vessel, raised by the steam pressure through a rising pipe and an extraction chamber and subsequently is collected in a beverage container on top of the water boiling vessel

Definitions

  • the present invention relates to a valve for dispensing an infusion, capable of providing infusion with foam.
  • a valve is applicable to an infusion dispensing duct of a household coffee machine, for example of the moka type, in which the infusion is e.g. coffee.
  • the present invention also relates to a moka-type coffee machine comprising a valve capable of dispensing an infusion with foam.
  • Machines for providing an infusion of expresso coffee for a coffee shop which provide pressurized hot water and guide it through a filter containing coffee powder. By crossing the coffee powder, the pressurized hot water dissolves certain substances in the coffee powder and acquires the flavor and color thereof, thus forming a coffee infusion.
  • the expresso coffee is channeled outside the machine, downstream of the filter, up to a cup which is then served.
  • the expresso coffee made by means of such a coffee shop expresso coffee machine has the characteristic of forming a surface layer of infusion foam, the so-called cream, which floats on top of the infusion, which is darker than foam.
  • an object of the present invention to make available an infusion dispensing valve for a household coffee machine, for example of the moka type, capable of dispensing an infusion with foam in quantities and having qualities similar to the ones generated by a coffee shop expresso coffee machine.
  • an object of the present invention to provide an infusion dispensing valve for a household coffee machine, for example of the moka type, capable of dispensing an increased quantity of foam together with the infusion.
  • the valve comprises a valve body comprising an inner guiding surface and forming a valve body outlet surface and a shutter body which slides inside the guiding side surface, in which the side surface of the shutter body forms a fluid seal with the guiding side surface between a first position and a second position, and in which in the second position, it acts in conjunction with the valve body outlet surface thus forming a fluid-dynamic passage between the side surface of the shutter body and the valve body outlet surface having predetermined shape for dispensing infusion with foam.
  • the shutter body In the second position, the shutter body is kept in balance between a force applied by the thrusting means and an opposite pressure exerted by the infusion.
  • the infusion is dispensed at a pressure corresponding to the predetermined pressure, passing in the fluid- dynamic passage formed between the side surface of the shutter body and the valve body outlet surface, and this passage has a predetermined shape.
  • the shape of the side surface of the shutter body and the shape of the valve body outlet surface may be selected according to the density or consistency of the foam intended to be obtained together with the infusion.
  • FIG. 1 shows a longitudinal sectional view of a coffee machine comprising a dispensing valve according to an aspect of the invention
  • FIG. 2 shows a side view of a valve according to an aspect of the invention, in a service position in which it may dispense infusion with foam;
  • FIG. 3 shows a sectional view of the valve in figure 2, wherein the shutter body is in a first position in which the infusion pressure in the inlet opening of the valve is not high enough to move the shutter body from the first position, thus preventing the dispensing of infusion;
  • figure 4 shows a sectional view of figure 2, in which the shutter body is in equilibrium in a second position B at an outlet surface of the valve body, in which the infusion flows pressurized through the fluid-dynamic passage formed between the outlet opening and the shutter body, thus dispensing infusion with foam;
  • figure 5 shows an enlarged detailed view of figure 4, at the fluid-dynamic passage
  • figure 5a shows a schematization of the fluid-dynamic passage in figure 5;
  • FIG. 6 shows a side view of the valve in figure 2, in a dispensing position of infusion with no foam
  • FIG. 7 shows a longitudinal sectional view of the valve in figure 6, in which the shutter body is in a third position away from the infusion outlet surface so as to avoid to fluid-dynamically interfere with the exiting flow and to make free the passage thereof, at ambient pressure;
  • FIG. 8 shows a side view of a possible embodiment of the shutter body according to an aspect of the present invention
  • FIG. 9 shows a longitudinal sectional view of a second embodiment of a valve according to the invention, in which an elastic thrusting element is made in one piece with the shutter body, and wherein the shutter body is in the first position;
  • FIG. 10 shows the view in figure 9, wherein the shutter body is in the second position B;
  • FIG. 11 shows the sectional view in figure 9, wherein the shutter body is in the third position
  • figure 12 shows an enlarged detail of figure 10
  • figure 12a shows a schematization of the fluid-dynamic passage in figure 12;
  • - figure 13 shows a sectional view of a possible embodiment of the shutter body of the valve according to an aspect of the present invention
  • - figure 14 shows a longitudinal sectional view of another embodiment of a valve according to the invention, wherein the shutter body comprises a venting device adapted to allow the exit of steam without moving the shutter body and to move the shutter body only when it is hit by the liquid infusion, in which the shutter body is in the first position, thus allowing the steam to exit;
  • FIG. 15 shows the sectional view in figure 14 wherein the shutter body is still in the first position, but the venting device has just been reached by the liquid fluid, which is increasing the pressure thereof up to a threshold value able to move the shutter body up to the second position;
  • FIG. 16 shows the sectional view in figure 14, in which the shutter body has reached the second position, wherein the infusion is dispensed under pressure by passing through the fluid-dynamic passage between the outlet surface of the valve body and the shutter body;
  • figure 17 shows an enlarged detail of figure 16
  • figure 17a is a schematization of the fluid-dynamic passage in figure 17;
  • FIG. 18 shows the sectional view in figure 14 in which the shutter body is in the third position, in which it may dispense infusion with no foam;
  • FIG. 19 shows a side view of a possible shutter body according to one aspect of the invention.
  • FIG. 20 shows a longitudinal sectional view of the shutter body in figure 19;
  • FIG. 21 shows a longitudinal sectional view of a further embodiment of a valve according to an aspect of the invention, comprising a thrusting body which is separated from the shutter body and adapted to act against the shutter body, in which the shutter body is in the first position and forms a seal with the thrusting body;
  • FIG. 22 shows the sectional view in figure 21 , in which the shutter body is in the second position, in which the valve dispenses infusion with foam;
  • FIG. 23 shows the sectional view in figure 21 , in which the shutter body is in a third position which is coincident with the first position and in which the thrusting body is moved away from the shutter body to form a free passage of fluid through the shutter body and between the shutter body and the thrusting body to allow the infusion to be dispensed of with no foam at ambient pressure;
  • - figure 24 shows an enlarged detail of the cross-section in figure 22 at the fluid- dynamic passage between the outlet surface of the valve body and shutter body;
  • - figure 24a shows a schematization of the fluid-dynamic passage in figure 24;
  • FIG. 25 shows a longitudinal sectional view of a thrusting body of the valve in figure 21 ;
  • FIG. 26 shows a longitudinal sectional view of a shutter body which may be coupled with the thrusting body in figure 25, of the valve in figure 21 ;
  • FIG. 27 and 28 show axonometric views of a valve body of a valve according to the invention
  • FIG. 29 shows a longitudinal sectional view of the valve body in figures 27 and 28;
  • FIG 30 shows a perspective view of an exploded view of a valve according to one aspect of the invention, for example shown in figure 14.
  • tubular body axis is made below to indicate a sliding direction of the shutter body in the valve body. Sometimes, the tubular body axis is indicated with longitudinal axis. Likewise, “longitudinal plane” indicates a plane lying along the tubular body axis.
  • an infusion dispensing valve for a coffee machine for example of the moka type, adapted to dispense infusion with foam according to the invention, is indicated as a whole with numeral 1.
  • a moka-type coffee machine according to another aspect of the invention is indicated with numeral 100.
  • the infusion dispensing valve 1 comprises a valve body 10 comprising a tubular portion 1 1 defining a tubular body inner side surface 12'.
  • the tubular body inner side surface 12' comprises a guiding side surface 12 extending around, and parallel to a tubular body axis (S-S).
  • valve body 27, 28, 29 An example of such a valve body is shown in figures 27, 28, 29.
  • the guiding surface 12 is a closed side surface having cross-section perpendicular to the tubular body axis S-S which is constant along the tubular body axis S-S.
  • Such a guiding surface 12 allows the sliding thereon along the tubular body axis, of a shutter body 30 in a manner similar to a cylinder-piston system.
  • the guiding surface 12 is cylindrical with axis coinciding with the tubular body axis S-S.
  • the guiding surface 12 may be prismatic in shape.
  • the tubular portion 1 1 comprises an infusion inlet opening 14 which opens into the tubular portion 11 and an infusion outlet opening 15 which opens into the tubular body inner side surface 12'.
  • the guiding side surface 12 is at least partly interposed between the infusion inlet opening 14 and the infusion outlet opening 15.
  • the side outlet opening 15 is defined by a side opening surface 16 comprising a lower portion of side opening surface 17 from which the side outlet opening 15 extends away from the infusion inlet opening 14.
  • the lower portion of side opening surface 17 is at a distance from the inlet opening shorter than the distance of a top portion of side opening surface from the infusion inlet opening 14.
  • Valve 1 further comprises a shutter body 30 slidably engaged in the guiding side surface 12 along the tubular portion axis S-S between a first position A close to the inlet opening 14 and a second position B close to the lower opening edge 18.
  • the shutter body comprises a front face 31 facing towards said infusion inlet opening 14, an opposite rear face 32, a sealing side surface 33 which connects the front face 31 and the rear face 32.
  • the shutter body further comprises thrusting means 40 acting against said shutter body 30 to thrust the shutter body 30 from the second position B towards the first position A.
  • the thrusting means 40 are sized to position the shutter body 30 in the second position B when a predetermined infusion dispensing pressure value in opposition to the thrusting means 40 is reached in the inlet opening 14.
  • the side surface 33 of the shutter body is shaped to form a fluid seal with the guiding side surface 12 between the first and second position B, and to act in conjunction with the valve body outlet surface 19 so as to form, in the second position B, a fluid-dynamic passage 20 between the side surface of the shutter body 33 and the valve body outlet surface 19 having a predetermined shape for dispensing infusion with foam.
  • the shutter body 30 forms a fluid seal with the guiding side surface 12 between the first position A and the second position B, and forms a fluid-dynamic passage with predetermined shape in the second position B.
  • the shutter body 30 stops in equilibrium in the second position B as the result of the pressure applied by the infusion to the front face of the shutter body and of the opposite thrusting forces applied by the thrusting means to the shutter body.
  • Such a concomitance generates a significantly greater quantity of infusion foam than the one generated by the known valves for a household moka- type coffee machine.
  • the predetermined infusion dispensing pressure value is selected between 1.8 and 2.9 bar.
  • the predetermined infusion dispensing pressure value is selected between 2.1 and 2.8 bar.
  • the formation of a greater quantity of foam is noted in this range.
  • the predetermined infusion dispensing pressure value is about 2.7 bar. The maximum formation of foam was noted at this value.
  • such a passage 20 has a passage portion having decreasing cross-section 22 proceeding along to an infusion exit direction 21 from inside the valve body towards the outside of the valve body, said cross-section being evaluated perpendicular to said infusion exit direction 21.
  • the intersection of the fluid-dynamic passage 20 with a plane lying on, or comprising, the tubular body axis S-S comprises a portion of fluid-dynamic passage 22 having decreasing width proceeding along to an infusion exit direction 21 from inside the valve body towards the outside of the valve body, said width being measured perpendicular to said infusion exit direction 21.
  • tubular body axis S-S comprises a cross-section of fluid-dynamic passage which is decreasing from inside the valve body to the outside of the valve body.
  • the fluid exits from the fluid-dynamic passage 22 while expanding very quickly because it is no longer constricted by the fluid- dynamic passage. Moreover, the rapidity of expansion is even quicker by the increased exiting speed, which is generated by the first portion of the passage having decreasing cross-section 22.
  • a sharp sealing edge 34 preferably protruding from said side surface of shutter body 33, adapted to slide along the guiding side surface 12 forming the fluid seal.
  • said sealing edge is formed by the intersection of the rear face 32 with the side surface 33 of the shutter body 30.
  • the intersections of the rear face 32 and of the side surface 33 of the shutter body with a plane lying along, or parallel to the tubular body axis S-S, are lines which are incident in a sealing point 34', wherein the tangents of such lines in said sealing point 34' form an acute angle 35 therebetween.
  • the acute angle 35 ranges between
  • 45° and 89° preferably between 40° and 80°, and even more preferably is about 60°.
  • the sealing point 34' belongs to the sealing edge 34.
  • such a passage 20 has a passage portion having increasing cross-section 23 proceeding along to an infusion exit direction 21 from inside the valve body towards the outside of the valve body, said cross-section being evaluated perpendicular to said infusion exit direction 21.
  • the intersection of the fluid-dynamic passage 20 with a plane lying on, or comprising, the tubular body axis S-S comprises a portion of fluid-dynamic passage 23 having increasing width proceeding along to an infusion exit direction 21 from inside the valve body towards the outside of the valve body, said width being measured perpendicular to said infusion exit direction 21.
  • tubular body axis S-S comprises a portion of fluid-dynamic passage 23 having an increasing width proceeding from inside the valve body to the outside of the valve body.
  • the presence of the passage portion having increasing cross- section 23 allows to be performed a partial and controlled expansion of the exiting infusion which, when associated with a compression, may affect the quality and quantity of the foam of the exiting infusion.
  • the passage 20 comprises a portion of passage 22, 23 having a cross-section, measured orthogonal to an infusion exit direction 21 from inside of the valve body towards outside of the valve body, which varies proceeding along the infusion exit direction 21 , from inside of the valve body towards the outside of the valve body.
  • the intersection of the fluid- dynamic passage 20 with a plane laying on, or passing along, the tubular body axis S-S comprises a portion of fluid-dynamic passage having a width, measured orthogonal to an infusion exit direction n21 , which varies proceeding along the infusion exit direction 21 , from the inside of the valve body towards the outside of the valve body.
  • the distance measured between the side surface of the shutter body 33 and the valve body outlet surface 19, along a section plane lying on, or comprising, the tubular body axis S-S and measured orthogonal to an infusion exit direction 21 varies along said infusion exit direction 21.
  • the portion of fluid-dynamic passage having increasing cross-section 23 may be arranged downstream of said portion of fluid- dynamic passage having a decreasing cross-section 22 according to the infusion exit direction 21.
  • the portion of fluid-dynamic passage having increasing cross-section 23 may be arranged downstream of said portion of fluid- dynamic passage having a decreasing cross-section 22 according to the infusion exit direction 21.
  • the exiting infusion which crosses the fluid-dynamic passage according to direction 21 is first compressed in the passage portion having decreasing cross-section 22 and then is expanded in a controlled manner in the passage portion having increasing cross-section 23 before reaching the outside of the valve at ambient pressure. This allows a more dense consistency cream to be obtained.
  • the portion of fluid-dynamic passage having increasing cross-section 23 is arranged upstream of the portion of fluid-dynamic passage having decreasing cross-section 22 according to the infusion exit direction 21.
  • this configuration is described in figure 12a.
  • the infusion is first partly expanded in a controlled manner in the portion having increasing cross-section 23, then it crosses the portion having decreasing cross-section 22 wherein it is greatly compressed, and then it is quickly expanded up to ambient pressure, at the exit from the fluid-dynamic passage 20.
  • the controlled expansion in the portion 23 increases the effect of the successive quick compression in the portion 22 and instantaneous expansion at the exit from the outlet opening 15. This allows a foam with a more delicate consistency to be obtained since it is fluffier.
  • the shape of the fluid-dynamic passage 20 is defined by the shape of the side surface of shutter body 33 and by the valve body outlet surface 19.
  • the convex portion 37 is adjacent to the front face 31 and the concave portion 36 is adjacent to the rear face 32, and the convex portion 37 is adjacent to the concave portion 36.
  • the concave portion 36 and/or the convex portion 37 is delimited by a curved line.
  • the concave portion 36 is curved with a first radius of curvature and the convex portion 37 is curved with a second radius of curvature.
  • the first radius of curvature is greater than the second radius of curvature.
  • the guiding side surface 12 is filleted with said lower portion of side opening surface 17 along the lower opening edge 18 according to a predetermined fillet radius.
  • the predetermined fillet radius is substantially equal to the second radius of curvature.
  • the guiding side surface 12 is cylindrical, preferably coaxial with the tubular body axis S-S, and wherein the shutter body 30 has a cylindrical symmetry with respect to the tubular body axis S- S.
  • the intersection between the side surface 33 of the shutter body and the front face 31 of the shutter body forms a front edge of shutter body parallel to the lower opening edge 18, preferably the edge of shutter body and said lower opening edge 18 lying on planes perpendicular to the tubular portion axis 11.
  • the shutter 30 is substantially flat and perpendicular to the tubular portion axis 1 1 , or in which the front face 31 of the shutter body is conical and coaxial with the tubular portion axis S-S, for example with the vertex facing towards the part opposite to the rear face 32.
  • the lower portion of side opening surface 17 of the valve body is substantially flat, preferably perpendicular to the tubular portion axis S-S.
  • the tubular portion 1 1 comprises an abutment surface 13 protruding inward with respect to the guiding side surface 12 from one end of said guiding side surface 12 facing towards said inlet opening 14, said abutment surface 13 being adapted to receive the front face of the shutter body 30 in abutment, in the first position.
  • the abutment surface 13 is complementary to the front face 31 of the shutter body 30, for example the abutment surface 13 and the front face 31 of the shutter body are substantially flat and perpendicular to the tubular portion axis S-S.
  • the inlet opening 14 opens into said abutment surface 13, for example in the middle thereof.
  • the inlet opening 14 has a side inlet opening surface 1 14 which extends about the tubular portion axis S-S, for example the side inlet opening surface 114 is coaxially cylindrical with the tubular portion axis S-S.
  • the side inlet opening surface 1 14 comprises a thread for mounting to a dispensing duct 105 of a coffee machine 100.
  • the tubular portion 11 comprises a fastening portion 1 15 for fastening to a dispensing duct 105 of a coffee machine 100, for example said fastening portion 115 is arranged at one end of said tubular portion 1 1 as an extension of said tubular portion 1 1 , for example said fastening portion 1 15 internally comprises said side inlet opening surface 1 14, for example said fastening portion 1 15 is tubular and coaxial with the tubular portion axis S-S.
  • the at least one outlet opening 15 extends through the tubular portion 11 , in a radial direction with respect to the tubular portion axis S-S.
  • the at least one outlet opening 15 has a cross- section defined by means of a plane tangent with respect to the tubular portion axis S-S, the cross-section being substantially rectangular or square in shape, for example having two sides substantially parallel to the tubular portion axis S-S and two sides substantially perpendicular to the tubular portion axis S-S.
  • the at least one outlet opening 15 has a radial cross-section, i.e. detected parallel to the tubular portion axis S-S, which substantially is rectangular or square in shape, for example having two sides substantially parallel to the tubular portion axis S-S and two sides substantially perpendicular to the tubular portion axis S-S.
  • the lower portion of side opening surface 17 is substantially perpendicular to the guiding side surface 12.
  • the at least one opening 15 is formed by only two openings 15, arranged in diametrically opposite positions with respect to the tubular portion axis S-S.
  • valve 1 comprises a command device
  • the shutter body 30 for bringing the shutter body 30 to a third position C, preferably inside the tubular portion 1 1 , along the tubular portion axis S-S, in which in said third position C, the shutter body 30 is at a distance from the valve body outlet surface 17 such as to allow a free flowing of infusion exiting through the at least one side opening 15 so that said infusion has no foam.
  • the second position B is at a first predetermined distance from the first position A, which is measured parallel to the tubular portion axis S-S.
  • the third position C is at a greater distance from the first position A than the distance between the second position B and the first position, the third position C being on the same side as the second position B with respect to the first position A.
  • position C may be at a second distance from position A, in which the second distance is greater than the first distance.
  • the third position C coincides with the first position A.
  • the valve comprises a separate thrusting body 45 from the shutter body 30, and the shutter body 30 is left to fall, for example by gravity, from the second position B to the first position to allow a free flowing of the infusion between the shutter body 30 and the thrusting body 45.
  • This embodiment is described in more detail below in the present description.
  • the command device 70 comprises a manually-operated knob 71 and an actuation 72 with two axial positions, for example a bayonet actuation.
  • actuation 72 with two axial positions comprises:
  • a groove 73 which is integral with the valve body 1 1 , for example made in the valve body 11 , comprising a circumferential portion with respect to the tubular portion axis S-S and a portion parallel to the tubular portion axis S-S, which are connected to each other to form an L;
  • the shutter body may be affected to move from the second position B to the third position C by means of a rotating movement of knob 71 around the tubular portion axis S-S, which is associated with an axial movement of the knob along the tubular portion axis S-S, away from the valve body 10.
  • the thrusting means 40 are interposed between the shutter body 30 and the command device 70, for example between the shutter body 30 and knob 71.
  • the thrusting means 40 comprise an elastic body 41 or a magnetic system (not shown in the drawings).
  • the elastic body 41 may be a compression spring, for example a helical spring, for example made of harmonic steel.
  • a helical compression spring 41 is for example shown in the embodiments in figures 2-5, 6-7, 14-18, 21-24.
  • the elastic body 41 may be formed by an elastic portion made in one piece with the shutter body 30, for example made of the same material as the shutter body 30.
  • Such an elastic portion 41 for example, is cylindrical in shape with a plurality of circumferential notches adapted to facilitate the elastic deformation in axial direction, i.e. along the tubular portion axis S-S.
  • Such an embodiment is shown in figures 9 to 11.
  • the compression spring or the elastic portion may be used indifferently in each of the embodiments described above.
  • the thrusting means 40 comprise an elastic member 41 as described above, for example a helical compression spring, and a thrusting body 45 associated with the elastic member 41.
  • spring 41 is interposed between the thrusting body 45 and the command device 70, for example the thrusting body 45 is fixed to a first end of spring 41 , and a second end of spring 41 is fixed to the command device 70.
  • spring 41 is adapted to thrust the shutter body 30 from the second position B to the first position A by means of the thrusting body 45.
  • the thrusting body 45 is separate from the shutter body 30.
  • the shutter body 30 has a through opening of shutter body 36 which crosses the rear face 32 and the front face 31 of the shutter body 30.
  • the thrusting body 45 has a front surface of thrusting body 37 facing said rear face 32 of the shutter body 30 and adapted to form a seal between the front surface of thrusting body 37 and the through opening of shutter body 36 when said thrusting body 45 is thrusted against the shutter body 30.
  • shutter body 36 is substantially cylindrical and perpendicular to the front face 31 and to the rear face 32.
  • the diameter of the through opening of shutter body 36 is substantially equal to the diameter of the inlet opening 14.
  • the shutter body 30 may be for example, substantially toroidal in shape.
  • the thrusting body 45 is made of elastic polymer. [00121] According to an embodiment, for example shown in figures 14 to
  • the shutter body 30 comprises a venting device 60 encased in the shutter body 30, said venting device 60 comprising a fluid passage 61 which entirely crosses the shutter body 30, for example along the tubular body axis S-S, wherein the venting device 60 is configured to allow a flow of steam through the fluid passage 61 in the direction that goes from the front face 31 towards the rear face 32 and to prevent a flow of liquid infusion through the fluid passage 61 in the direction that goes from the front face 31 towards the rear face 32.
  • the venting device 60 comprises a tubular portion 62 which extends along the sliding direction S-S, thus forming therein the fluid passage 61 , wherein the tubular portion 62 has a lower end closed by a front wall 63 having a front opening 64 and an opposite rear end closed by a rear wall 65 having a rear opening 66, the tubular portion 62 containing therein an occlusion element 67 which is movable in the passage 61 between the front opening 64 and the rear opening 66, thus leaving a free space 68 laterally between the occlusion element 67 and the tubular portion 61 , said occlusion element 67 being affected against the front opening 64 so as to allow the steam to move the occlusion element 67 from the front opening 64, thus avoiding to occlude the rear opening 65 to allow steam to flow, and so as to allow the infusion to push the occlusion body 67 against the rear opening 66 to prevent the infusion to flow.
  • the front opening 64 and the rear opening 66 are operatively aligned along the tubular portion axis S-S.
  • the front opening 64 and the rear opening 66 are operatively aligned along a vertical direction so that the occlusion element 67 is affected towards the front opening 64 due to the force of gravity.
  • the occlusion element 67 substantially is spherical with predetermined sphere radius, and the front opening 64 and the rear opening 66 are circular, equal to each other and with a smaller diameter than the sphere diameter.
  • the shutter body 30 is made of elastic polymeric material, for example of silicone.
  • the shutter body 30 has an overall diameter, measured with respect to the tubular body axis S-S, which is larger than a corresponding overall diameter of the guiding side surface 12, it also being measured with respect to the tubular body axis S-S, so that between the first position A and the second position B, the shutter body 30 is elastically compressed radially by the guiding side surface 12 and so that in the second position B, the shutter body 30 is free to elastically expand radially to form the aforesaid fluid- dynamic passage 20 having a predetermined shape.
  • the valve body 10 is made of aluminum alloy.
  • valve 1 comprises an spatter-guard body 80 arranged externally around the valve body 10 and spaced apart from the valve body 10 so as to at least partly cover the at least one outlet opening 15 and to allow the flow of infusion between the valve body 10 and the spatter-guard body 80.
  • the spatter-guard body 80 is tubular in shape, cylindrical and coaxial with the axis of the valve body S-S.
  • a top end of the spatter-guard body 80 is fixed or mounted to a top end of the valve body 10.
  • a coffee machine 100 for example of the moka type, for example shown in figure 1 , comprising a boiler 101 adapted to contain a liquid 102 to be heated, a collector 103 adapted to collect an infusion 104, a dispensing duct 105 adapted to convey the infusion into said collector 103, a powder-holding filter 106 adapted to contain a predetermined amount of infusion powder 107, in which filter 106 is interposed between, and in fluidic communication with, the boiler 101 and the dispensing duct 105 in order to be crossed by the heated liquid 102 in order to provide the infusion 104.
  • the coffee machine 100 further comprises a valve 1 as described above, wherein valve 1 is fixed or mounted at an outlet end of the dispensing duct 105, wherein the dispensing duct 105 is in fluidic connection with the inlet opening 14 of the valve body 10.
  • the dispensing duct 105 extends along a direction of dispensing duct, and valve 1 is mounted to the dispensing duct 105 so that the valve body axis S-S coincides with the dispensing duct axis.
  • the dispensing duct axis in use is arranged in a vertical direction.
  • the pressure of the infusion, applied to the shutter body 30, increases and the shutter body sealingly slides up to the second position wherein a fluid-dynamic passage 20 is formed between the side surface 33 of the shutter body and the outlet surface 19 of the valve body.
  • the valve body is kept in equilibrium by means of the force applied by the thrusting means 40, for example an elastic force, and by means of the infusion pressure, which, in this circumstance, is equal to the predetermined pressure value.
  • the shutter body 30 may be brought into the third position C by manually actuating the command means 70.
  • the shutter body 30 In the third position C, the shutter body 30 is away from the outlet surface 19 of the valve body and is not actuated by the thrusting means.
  • the infusion is free to exit through the at least one outlet 15 at a pressure which is substantially equal to the ambient pressure, and is not forced through the fluid-dynamic passage. Under these conditions, the infusion is dispensed with no foam and the coffee machine operates in the standard operating mode of a moka coffee machine.
  • the shutter body in an initial state of unheated liquid, the shutter body is in the first position A, thrusted by the thrusting means 40.
  • a venting device 60 is arranged through the shutter body 30.
  • the infusion reaches the shutter body 30 and the venting device 60, which prevents the passage of the infusion therethrough. In other words, under this condition, a flowing of infusion is prevented from the inlet opening 14 to the at least one outlet opening 15.
  • the shutter body 30 As the pressure of the infusion increases, the shutter body 30 is thrusted towards the second position and the infusion is dispensed at a predetermined pressure through the fluid-dynamic passage having predetermined shape, exactly as occurs for the operation of the embodiments in figures 2 to 13 described above.
  • the shutter body 30 may be brought into the third position C by manually actuating the command means 70.
  • the shutter body 30 In the third position C, the shutter body 30 is away from the outlet surface 19 of the valve body and is not actuated by the thrusting means.
  • the infusion is free to exit through the at least one outlet 15 at a pressure which is substantially equal to the ambient pressure, and it is not forced through the fluid-dynamic passage. Under these conditions, the infusion is dispensed with no foam and the coffee machine operates in the standard operating mode of a moka coffee machine.
  • the thrusting means 40 comprise a thrusting body 45 separated from the shutter body 30, wherein the shutter body has a through opening 36 and the thrusting body 45 has a surface adapted to form a seal with the opening 36 when it is thrusted against the shutter body 30.
  • the thrusting body 45 is thrusted against the shutter body, which is in the first position A.
  • the thrusting body thus forms a seal with the shutter body 30, which forms a seal with the guiding surface 12 of the valve body.
  • the pressure of the infusion pushes the shutter body 30, together with the thrusting body 45, towards the second position B, so they slide together as a packet, up to the shutter body 30 reaches the second position.
  • the shutter body is in equilibrium and the infusion is dispensed at the predetermined pressure through the fluid- dynamic passage 20, as occurs in the other embodiments of the present invention.
  • a different operation with no foam is provided also for the embodiments in figures 21 to 26, wherein, before use, the shutter body 30 is brought into the third position C by manually actuating the command means 70. In the third position C, the thrusting body 45 is brought into a different third position far from the first position, and shutter 30 returns to the first position A. Having returned to the first position, shutter 30 is away from the outlet surface 19 of the valve body and is not actuated by the thrusting means. In such a circumstance, the infusion is free to exit through the at least one outlet 15 at a pressure which is substantially equal to the ambient pressure, and is not forced through the fluid-dynamic passage. Under these conditions, the infusion is dispensed with no foam and the coffee machine operates in the standard operating mode of a moka coffee machine.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Apparatus For Making Beverages (AREA)

Abstract

L'invention concerne une valve de distribution d'infusion (1) pour une machine à café de type moka (100) conçue pour distribuer une infusion avec une mousse, comprenant un corps de valve (10) comportant une partie tubulaire (11) définissant une surface latérale interne de corps tubulaire (12') et un axe de corps tubulaire (S-S). La surface latérale interne de corps tubulaire (12') comprend une surface latérale de guidage (12) s'étendant parallèlement à l'axe de corps tubulaire (S-S), la partie tubulaire comprenant une ouverture d'entrée d'infusion (14) qui s'ouvre dans ladite partie tubulaire (11) et une ouverture de sortie d'infusion (15) qui s'ouvre dans ladite surface latérale interne de corps tubulaire (12'), ladite surface latérale de guidage (12) étant au moins partiellement interposée entre ladite ouverture d'entrée d'infusion (14) et ladite ouverture de sortie d'infusion (15); ladite ouverture de sortie latérale (15) étant définie par une surface d'ouverture latérale (16) comprenant une partie inférieure de surface d'ouverture latérale (17) à partir de laquelle ladite ouverture de sortie latérale (15) s'éloigne de ladite ouverture d'entrée d'infusion (14), ladite partie inférieure de surface d'ouverture latérale (17) coupant ladite surface latérale de guidage (12) le long d'un bord d'ouverture inférieur (18), ladite partie inférieure de surface d'ouverture latérale (17), ledit bord d'ouverture inférieur (18) et ladite surface de guidage latérale (12) formant une surface de sortie de corps de valve (19); un corps d'obturateur (30) en prise coulissante dans ladite surface latérale de guidage (12) le long de l'axe de partie tubulaire entre une première position (A) proche de l'ouverture d'entrée (14) et une seconde position (B) proche du bord d'ouverture inférieur (18), ledit corps d'obturateur comprenant une face avant (31) faisant face à ladite ouverture d'entrée d'infusion (14), une face arrière opposée (32), une surface latérale d'étanchéité (33) qui relie la face avant (31) et la face arrière (32); des moyens de poussée (40) agissant contre ledit corps d'obturateur (30) pour pousser le corps d'obturateur (30) de la seconde position (B) à la première position (A), et dimensionnés pour maintenir le corps d'obturateur (30) en équilibre dans ladite seconde position (B) une fois qu'une pression de distribution d'infusion prédéterminée en opposition auxdits moyens de poussée (40) a été atteinte dans ladite ouverture d'entrée (14); la surface latérale (33) du corps d'obturateur étant façonnée pour former un joint étanche aux fluides avec ladite surface latérale de guidage (12) entre la première position (A) et la seconde position (B), et agir conjointement avec ladite surface de sortie de corps de valve (19) de façon à former, dans ladite seconde position (B), un passage de fluide dynamique (20) entre la surface latérale du corps d'obturateur (33) et la surface de sortie de corps de valve (19) ayant une forme prédéterminée pour distribuer une infusion avec une mousse.
PCT/IB2017/050778 2016-02-26 2017-02-13 Valve pour distribution d'infusion avec une mousse pour machine à café de type moka, et machine à café comprenant ladite valve Ceased WO2017144996A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITUB2016A001132A ITUB20161132A1 (it) 2016-02-26 2016-02-26 Valvola di erogazione infuso con schiuma per caffettiera di tipo moka e caffettiera comprendente detta valvola
IT102016000020320 2016-02-26

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Cited By (6)

* Cited by examiner, † Cited by third party
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CN108852004A (zh) * 2018-09-17 2018-11-23 赵枫 一种咖啡高倍发泡的方法和装置
WO2019111074A1 (fr) * 2017-12-04 2019-06-13 Bialetti Industrie S.P.A. Machine à café avec dispositif de moussage
CN110353500A (zh) * 2019-07-23 2019-10-22 浙江创建厨具有限公司 一种一体式摩卡壶底座及其一体成型方法
CN111870126A (zh) * 2019-05-03 2020-11-03 纬创资通股份有限公司 萃取装置与萃取方法
WO2021144697A1 (fr) * 2020-01-16 2021-07-22 Bialetti Industrie S.P.A. Machine à café dotée d'un dispositif de moussage
IT202100009164A1 (it) * 2021-04-13 2022-10-13 Gianluca Baccari Dispositivo per generare crema o schiuma di caffè che si inserisce in una caffettiera del tipo moka

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WO1998017160A1 (fr) * 1996-10-18 1998-04-30 S.P.A. Alfonso Bialetti & C. Cafetiere a pression pour preparer des infusions de cafe
WO2006008763A1 (fr) * 2004-07-20 2006-01-26 Bialetti Industrie S.P.A. Equipement destine a la preparation d'une boisson chaude
WO2008087673A1 (fr) * 2007-01-19 2008-07-24 Bialetti Industrie S.P.A. Cafetière à système de débit contrôlé

Patent Citations (3)

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Publication number Priority date Publication date Assignee Title
WO1998017160A1 (fr) * 1996-10-18 1998-04-30 S.P.A. Alfonso Bialetti & C. Cafetiere a pression pour preparer des infusions de cafe
WO2006008763A1 (fr) * 2004-07-20 2006-01-26 Bialetti Industrie S.P.A. Equipement destine a la preparation d'une boisson chaude
WO2008087673A1 (fr) * 2007-01-19 2008-07-24 Bialetti Industrie S.P.A. Cafetière à système de débit contrôlé

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019111074A1 (fr) * 2017-12-04 2019-06-13 Bialetti Industrie S.P.A. Machine à café avec dispositif de moussage
CN108852004B (zh) * 2018-09-17 2023-10-27 赵枫 一种咖啡高倍发泡的方法和装置
WO2020057320A1 (fr) * 2018-09-17 2020-03-26 赵枫 Procédé et appareil de moussage de café à haut rendement
CN108852004A (zh) * 2018-09-17 2018-11-23 赵枫 一种咖啡高倍发泡的方法和装置
US12185865B2 (en) 2018-09-17 2025-01-07 MAKETUBE S.r.l Method and apparatus for high yield foaming of coffee
CN111870126A (zh) * 2019-05-03 2020-11-03 纬创资通股份有限公司 萃取装置与萃取方法
CN111870126B (zh) * 2019-05-03 2022-07-22 纬创资通股份有限公司 萃取装置与萃取方法
CN110353500A (zh) * 2019-07-23 2019-10-22 浙江创建厨具有限公司 一种一体式摩卡壶底座及其一体成型方法
CN110353500B (zh) * 2019-07-23 2021-01-08 浙江创建厨具有限公司 一种一体式摩卡壶底座及其一体成型方法
WO2021144697A1 (fr) * 2020-01-16 2021-07-22 Bialetti Industrie S.P.A. Machine à café dotée d'un dispositif de moussage
JP2023517809A (ja) * 2020-01-16 2023-04-27 ビアレッティ インドゥストリエ ソチエタ ペル アツィオニ 発泡装置を備えるコーヒーメーカー
CN115038368A (zh) * 2020-01-16 2022-09-09 比乐蒂工业股份有限公司 带有发泡装置的咖啡机
JP7624006B2 (ja) 2020-01-16 2025-01-29 ビアレッティ インドゥストリエ ソチエタ ペル アツィオニ 発泡装置を備えるコーヒーメーカー
IT202100009164A1 (it) * 2021-04-13 2022-10-13 Gianluca Baccari Dispositivo per generare crema o schiuma di caffè che si inserisce in una caffettiera del tipo moka

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