WO2016016185A1 - Soupape d'un circuit de fluide d'un véhicule automobile - Google Patents

Soupape d'un circuit de fluide d'un véhicule automobile Download PDF

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Publication number
WO2016016185A1
WO2016016185A1 PCT/EP2015/067145 EP2015067145W WO2016016185A1 WO 2016016185 A1 WO2016016185 A1 WO 2016016185A1 EP 2015067145 W EP2015067145 W EP 2015067145W WO 2016016185 A1 WO2016016185 A1 WO 2016016185A1
Authority
WO
WIPO (PCT)
Prior art keywords
valve
valve body
recess
fluid
housing
Prior art date
Application number
PCT/EP2015/067145
Other languages
German (de)
English (en)
Inventor
Hans-Peter Klein
Original Assignee
Mahle International Gmbh
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 Mahle International Gmbh filed Critical Mahle International Gmbh
Publication of WO2016016185A1 publication Critical patent/WO2016016185A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K11/00—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves
    • F16K11/02—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit
    • F16K11/06—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements
    • F16K11/072—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements with pivoted closure members
    • F16K11/074—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements with pivoted closure members with flat sealing faces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K25/00—Details relating to contact between valve members and seats
    • F16K25/005—Particular materials for seats or closure elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P7/00—Controlling of coolant flow
    • F01P7/14—Controlling of coolant flow the coolant being liquid
    • F01P2007/146—Controlling of coolant flow the coolant being liquid using valves

Definitions

  • the invention relates to a valve for regulating a fluid flow.
  • cooling circuits are integrated for cooling internal combustion engines and other heat-generating elements in order to dissipate the heat generated in the units and to cool the units.
  • the cooling circuits may include, among other things, heat sources, heat exchangers, pumps and control valves.
  • the circulating through the cooling circuit fluid can be passed through one or more control valves in different branches of the cooling circuit.
  • a fast, temperature-independent control or circuit of the valves is possible to allow the fastest possible and temperature-independent influencing of the cooling circuit.
  • a quick regulation of the cooling circuit is advantageous, inter alia, for an optimization of the injection parameters of the internal combustion engine, the rapid cooling down of the internal combustion engine and thus the increase in power of the internal combustion engine.
  • electrically driven valves have been developed.
  • US 5 950 576 A discloses a valve with a disk-shaped valve body.
  • the coolant is passed from one side into the interior of the valve through the valve body. There, it is deflected by 180 ° and then again passed through the valve body and discharged on the same side on which it was introduced into the valve again out of the valve.
  • a disadvantage of this valve is in particular the resulting pressure loss due to the deflection.
  • the valve body contains three openings for two inlet channels and one outlet channel, which is disadvantageous in particular with respect to the sealing of the valve.
  • DE 10 2006 053 310 A1 discloses a valve with a disk-shaped valve body.
  • the valve has a rotation angle-dependent opening characteristic for regulating the volume flows.
  • the valve body has a plurality of discrete openings for connecting an inlet channel to one of the outlet channels.
  • a particular disadvantage of this solution is that the edges of the plurality of openings constantly slide over the sealing means, whereby a strong wear on the sealing means is formed The flow and the vote of the coolant takes place in each case in an axial direction.
  • DE 101 27 711 ⁇ 4, DE 198 34 575 B4 and EP 0639 736 B1 each disclose valves in which the flow and the outflow of the coolant takes place in a radial direction.
  • the openings are in each case released or closed depending on the angle of rotation.
  • DE 103 51 852 A1 and DE 198 49 492 B4 each disclose a valve with a rotatable valve body, in which the flow or the outflow of the coolant takes place in the radial direction.
  • the valve body of DE 103 51 852 is formed by a spherical element.
  • DE 41 25 366 C1 discloses a valve whose flow and outflow also takes place in the radial direction.
  • the valve body is formed here by a translationally displaceable along an axis poppet valve. The flow and the outflow takes place in planes which are formed offset in the axial direction to each other.
  • the object of the present invention to provide a valve which allows an optimized flow and outflow of the coolant and at the same time has a simple and inexpensive construction.
  • the valve should have the highest possible durability, in particular with regard to the sealant.
  • the object with regard to the valve is achieved by a valve having the features of claim 1.
  • An embodiment of the invention relates to a valve for regulating a fluid idströmung, with a housing, with a valve body and at least two fluid idan whatevern along which the valve is flowed through, wherein the valve body is formed like a disk and rotatable about an axis of rotation in the internal volume of Housing is mounted, wherein the valve body has at least a first recess which penetrates the valve body in the axial direction, wherein the first recess extends along a first circular arc portion of the valve body, wherein a first flow path through the valve between two fluid ports is releasable through the first recess , Wherein one of the two fluid ports can be traversed in an axial direction and the other of the two fluid ports can be traversed in a radial direction.
  • the axial direction and the radial direction are defined with respect to the valve housing and the valve body.
  • the axis of rotation of the valve body defines the axial direction and a direction perpendicular to the valve
  • valve body By rotating the valve body, a flow path through the valve can be released.
  • the valve can advantageously be flowed through by one of the fluid connections on one of the end faces of the housing to form a fluid connection on the jacket surface of the housing.
  • the flow through the valve body along the recess takes place in an axial direction, which is essentially parallel to the axis of rotation of the valve body.
  • the length of the circular arc section of the recess and the speed with which the valve body is rotated may change the opening duration and thus the opening duration Fluid flow are influenced by the released flow path.
  • the first flow path is formed between a fluid connection, which is arranged on one of the end faces of the housing and can be flowed through in a direction which is parallel to the axis of rotation of the valve body, and a fluid connection which abuts against the jacket surface of the housing - Is ordered and can be flowed through in a radial direction.
  • a fluid connection which is arranged on one of the end faces of the housing and can be flowed through in a direction which is parallel to the axis of rotation of the valve body, and a fluid connection which abuts against the jacket surface of the housing - Is ordered and can be flowed through in a radial direction.
  • An axial direction always means a direction which extends essentially parallel to the direction of the axis of rotation of the valve body.
  • a radial direction is always meant a direction which is normal to the axis of rotation and is directed from the center of the valve body to the lateral surface of the housing.
  • the valve body has a second recess which extends along a second circular arc section of the valve body, wherein a second flow path through the valve between two fluid connections can be released by the second recess. Through a second recess, a second flow path can be released or closed.
  • one of the fluid ports is also arranged on one of the end face and can be flowed through in an axial direction, while the second fluid port is arranged on the lateral surface and can be flowed through in a radial direction.
  • a preferred embodiment is characterized in that the first circular arc portion is arranged offset to the second circular arc portion in the circumferential direction of the valve body by a predetermined angle.
  • the two flow paths can thus be released one after the other, ie at different angles of rotation of the valve body, or simultaneously, ie at the same angles of rotation of the valve body. Starting from a point defined as zero position, such an opening of one of the two flow paths after the rotation of the valve body by one certain angle while the other flow path still remains closed. With increasing rotation of the valve body and then the second flow path can be released. In this way, a cascade-like opening or closing of the flow paths is possible. The duration of the opening is determined by the length of the respective circular arc section and the speed with which the valve body is rotated.
  • first recess is arranged in the radial direction at a distance from the second recess, wherein each of the recesses is arranged in each case on a circular path extending concentrically to the center point of the valve body.
  • the individual fluid connections are each associated with only one specific recess. If the recesses were not spaced apart in the radial direction, a fluid connection of several recesses would be completely or partially released successively in the course of a complete rotation of the valve body through 360 °.
  • the circular paths, on which the recesses are arranged do not intersect in an advantageous embodiment and the recesses advantageously also do not protrude beyond the respective circular path into other circular paths.
  • the circular paths can be different widths depending on the radial extent of the recesses.
  • the FluidanschlQsse can thus be assigned by their arrangement on the housing relative to the valve body in a simple manner a certain circular path and thus also a specific opening.
  • a plurality of openings may be provided on a circular path, whereby a certain fluid connection can be released several times within a rotation.
  • a circular path can be assigned a plurality of FluidanschlQsse, whereby the associated Fluidan- conclusions are released once within a rotation of the valve body by 360 ° per recess and once closed.
  • a recess is interrupted by a web element.
  • the web element advantageously extends in the radial direction between the edge regions delimiting the recess.
  • the web element is advantageous in order to increase the rigidity of the valve body.
  • the web element has a smaller axial extent than the valve body.
  • a smaller axial extent of the web element in comparison to the axial extent of the valve body is advantageous in order to avoid overhanging the web element beyond the end faces of the valve body. This is particularly advantageous in order to avoid damage of sealing elements in the housing, which slide on the end faces of the valve body.
  • a thinner material thickness of the web element compared to the valve body is further advantageous in order not to cause a temporary partial or complete closure of a flow path released by the recess by the web element. Due to the offset of the web element to the end face of the valve body, which faces the fluid ports, at least a narrow gap remains at all times during the release of a flow path.
  • the recess or the recesses are delimited by an edge projecting from the valve body in the axial direction.
  • An axially projecting edge is advantageous in particular with regard to the production of the valve body as an injection molded part.
  • the edge favors in the manufacturing process a dimensionally true solidification of the plastic and thus leads to a high flatness of the valve body.
  • the edge height is preferably 0.01 times to 0.06 times the diameter of the valve body.
  • An edge delimiting the recess can also advantageously be used as a sealing surface, depending on its width.
  • valve body has at its radial edge region a projecting edge in the axial direction.
  • edge projecting on the radial edge region of the valve body is advantageous, in particular from a manufacturing point of view.
  • edge also a larger outwardly directed lateral surface of the Ventilotroe be generated, which is advantageous for the sealing of the valve body relative to the inner circumferential surface of the housing
  • valve body is coated with a sealing material and / or a friction-reducing material.
  • a sealing material is particularly advantageous for creating a seal between the valve body and the fluid ports and further providing a seal between the valve body and the housing.
  • a coating of a friction-reducing material is advantageous in order to minimize the friction losses and thus to increase the efficiency of the valve.
  • valve body is completely or partially made of polytetrafluoroethylene (PTFE) or of slide-promoting materials such as parylenes, ethylene-propylene-diene rubber (EPDM) or hydrogenated acrylonitrile-butadiene rubber (HNBR).
  • PTFE polytetrafluoroethylene
  • EPDM ethylene-propylene-diene rubber
  • HNBR hydrogenated acrylonitrile-butadiene rubber
  • the valve body may be partially or completely coated with these materials. This makes it possible to reduce the friction in the valve as much as possible and thus to improve the efficiency of the valve.
  • valve body is covered in the edge region of a recess with a sealing element, wherein the sealing element is formed completely circumferentially around the respective recess.
  • a sealing element is particularly advantageous for creating a seal of the respective recess with respect to the respective fluid connections.
  • the sealing element can be used advantageously to produce a seal against an inner surface of the housing, in particular one of the end faces.
  • a recess is arranged on the radial edge region of the valve body, so that the recess is bounded on three sides by the valve body and is bounded on one side by the housing of the valve.
  • Such an arrangement of the recess is advantageous to release a flow path particularly close to the lateral surface of the housing.
  • a recess has an increasing and / or decreasing radial extent in the circumferential direction.
  • a recess has a channel-like cross section, wherein the edges of the recess which are in the circumferential direction run parallel to one another.
  • the recesses run in particular within the concentric circular paths.
  • a recess has a circular cross section or an oval cross section.
  • An oval cross-section is particularly advantageous in order to achieve a reduction in the diameter of the valve body with the same cross-sectional area of the recess, since an oval opening with a smaller width in the radial direction may have the same cross-sectional area as a circular opening.
  • FIG. 1 shows a perspective view of a valve, wherein a plurality of fluid ports are arranged on the housing of the valve, which project both from one of the end faces of the housing and from the lateral surface of the housing,
  • FIG. 2 shows a perspective view of a valve body, as it can be rotatably mounted within the housing,
  • FIG. 3 shows a sectional view through the valve body according to FIG. 2, wherein in particular the web element can be seen in the recess,
  • FIG. 4 shows a plan view of the valve body, as shown in FIG. 2,
  • Figure 5 is a plan view of an alternatively designed valve body, wherein one of the recesses is arranged on the radial edge region and is limited only on three sides of the valve body, and
  • Figure 6 is a partial view of a valve body, wherein the valve body a
  • Recess has, which has an increasing width in the circumferential direction in the radial direction.
  • the valve 1 shows a perspective view of a valve 1.
  • the valve 1 is in particular an electronic valve which regulates a fluid flow through the valve 1 by the adjustment of a valve body arranged inside the valve 1.
  • the valve 1 has a housing 2, which has the FlukJan connections 3, 4, 5 and 6 on its outer surfaces.
  • the housing 2 is of a cylindrical basic shape and has two opposite end faces 7, 8 and a circumferential lateral surface 9.
  • the fluid connections 3, 4 are arranged on the upper end face 7 and project in an axial direction 11 from the housing 2.
  • the FluRJan-Schladore 5, 6 are arranged on the lateral surface 9 and protrude in a radial direction 10 from the housing 2 from.
  • the axial direction 11 corresponds to the direction of the axis of rotation of the rotatably mounted in the housing 2 valve body.
  • the direction 10 corresponds to the radial extent of the rotation axis towards the lateral surface 9 of the valve 1.
  • the fluid ports 3 to 6 can each be used for fluid supply or for fluid removal. This depends on the direction of flow of the valve 1. Furthermore, the valve 1 in Figure 1 holding and supporting elements on the housing 2, with which the valve 1 can be connected to support structures.
  • valve body 12 shows a perspective view of a valve body 12.
  • the valve body 12 is formed as a disk-like element and has a circular cross-section.
  • the valve body 12 extends mainly along a radial direction 10 and has a substantially smaller extent along an axial direction 11.
  • the valve body 12 is rotatably mounted in its center about a rotation axis.
  • the valve body 12 may be disposed within the housing 2 of the valve 1 of Figure 1.
  • the radial edge region 16 of the valve body 12 bears against an inner circumferential surface of the housing 2, as a result of which a fluid flow past the valve body 12 is reduced or completely avoided.
  • the valve body 12 has a first recess 13 and a second recess 14.
  • the recess 13 extends over a first circular arc section 21, while the second recess 14 extends above a second circular arc portion 22.
  • the circular arc sections 21, 22 of the recesses 13, 14 are arranged offset in the circumferential direction by a predeterminable angle 23 to each other
  • the circular arc sections 21, 22 also have different lengths.
  • the opening 13 is delimited by two edges 19, 20 extending parallel to each other in the circumferential direction and two radial edge regions.
  • the second recess 14 is delimited by two edges 17, 18 extending parallel to one another in the circumferential direction and two radial edge regions.
  • the second recess 14 extends over a longer circular arc portion 22 than the first recess 13.
  • the second recess 14 has a smaller width, the width being measured along the radial direction.
  • the first recess is interrupted by a web element 15, which extends in the radial direction from the inner edge 19 to the outer edge 20.
  • the web element serves, in particular, to increase the strength of the valve body 12.
  • the web element 15 is preferably formed in one piece with the remaining valve body 12.
  • the recesses may also be extended over longer or shorter circular arc sections.
  • the width may vary in the radial direction of the recesses.
  • the circular arc sections 21 and 22 overlap at least in a partial area along the circumferential direction.
  • the recesses may also be arranged such that no superposition of the circular arc sections is given
  • the recesses 13, 14 have in particular a channel-like structure, which is bounded by the mutually parallel circumferential edge regions 17, 18, 19 and 20 and extending in the radial direction edge regions by rotating the valve body 12 about the axis of rotation different flow paths within of the valve 1 through the respective recesses 13, 14 are released.
  • the corresponding flow paths can be closed again.
  • FIG. 3 shows a sectional view through the valve body 12 of Figure 2.
  • a section through the recess 13 is shown in particular. It can be seen in FIG. 3 that the web element 15 has a smaller extent in the axial direction 11 than the remaining valve body 12. This is particularly advantageous so that the web element 15 does not protrude beyond the upper end face of the valve body 12, and thus one Damage or entanglement of the valve 1 may cause.
  • sealing elements which may be arranged on the FlukJanschlQssen 3, 4, could be damaged by a projecting in the axial direction 11 web member 15.
  • the web element 15 may be formed as a solid body or a U-shaped cross section aul undoped material, which in particular material can be saved.
  • FIG. 4 shows a plan view of the valve body 12, as has already been shown in FIG.
  • the two recesses 13, 14 can be seen in the plan view of FIG. 4, the recess 13 arranged radially closer to the center being interrupted by the web element 15.
  • valve body 12 of Figure 5 shows an alternative embodiment of the valve body 12.
  • the valve body 12 of Figure 5 also has a first recess 13 which is interrupted by a web element 15.
  • the second recess 24 is in contrast to the preceding figures 2 and 4 only three-sided of the valve body 12 Be borders.
  • the recess 24 is formed on the radial edge portion 16 of the valve body 12 so as to be bounded toward the center of the valve body 12 by the circumferential edge 25 and further through the edges 26 and 27 extending in the radial direction 10.
  • the recess 24 is thus designed in particular in the radial direction 10 to the outside open.
  • a limitation of the recess 24 in the radial direction 10 is realized in the final mounted position by the inner circumferential surface of the housing 2.
  • the recess 24 also extends over a circular arc section in the circumferential direction of the valve body 12. Also in Figure 5, the circular arc sections of the recesses 13 and 24 are at least partially superimposed in the circumferential direction.
  • the cross section of the recess 24 may also be deviating from FIG. 5 and, for example, have a circular or oval cross section.
  • the recess 24 in the circumferential direction may have an increasing width in the radial direction 10 or a decreasing width.
  • a plurality of recesses within the valve body can also be provided.
  • a plurality of recesses may be arranged in each case on a circular path of the valve body.
  • one of the respective circular path associated flow path could be released or closed several times during a revolution through 360 °.
  • the recesses which are arranged on a common circular path, each associated with a flow path.
  • the individual circular paths extend in each case in the circumferential direction and have a certain width in the radial direction.
  • FIG. 6 shows a partial detail of a valve body 12.
  • a partial area of a further recess 28 is also shown in particular.
  • the recess 28, in comparison to the previous recesses 13, 14 and 24, has no edge regions running parallel to one another in the circumferential direction.
  • the recess 28, however, has a cross section, which increases or decreases in the circumferential direction in the radial extent.
  • a valve body can have both channel-like recesses with mutually parallel edge regions as well as recesses with widening or tapering cross sections.
  • the recesses may also have a cross section following a freeform.
  • FIGS. 1 to 6 have, in particular, no limiting character and serve to clarify the inventive concept.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Taps Or Cocks (AREA)
  • Multiple-Way Valves (AREA)

Abstract

L'invention concerne une soupape (1) servant à réguler un écoulement de fluide. La soupape comprend un carter (2), un corps de soupape (12) et au moins deux raccords de fluide (3, 4, 5, 6), le long desquels la soupape (1) peut être parcourue par un fluide. Le corps de soupape (12) est réalisé à la manière d'un disque et est logé, de manière à pouvoir tourner autour d'un axe de rotation, dans le volume intérieur du carter (2). Le corps de soupape (12) comporte au moins un premier évidement (13, 14, 24, 28), qui traverse le corps de soupape (12) dans une direction axiale (11). Le premier évidement (13, 14, 24, 28) s'étend le long d'un premier segment d'arc de cercle (21, 22) du corps de soupape (12). Un premier trajet d'écoulement peut être libéré à travers la soupape (1) entre deux raccords de fluide (3, 4, 5, 8) par le premier évidement (13, 14, 24, 28). Un des deux raccords de fluide (3, 4) peut être parcouru par un fluide dans une direction axiale (11), tandis que l'autre raccord de fluide parmi les deux raccords de fluide (5, 6) peut être parcouru par un fluide dans une direction radiale (10).
PCT/EP2015/067145 2014-07-29 2015-07-27 Soupape d'un circuit de fluide d'un véhicule automobile WO2016016185A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014110703.9A DE102014110703A1 (de) 2014-07-29 2014-07-29 Ventil
DE102014110703.9 2014-07-29

Publications (1)

Publication Number Publication Date
WO2016016185A1 true WO2016016185A1 (fr) 2016-02-04

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PCT/EP2015/067145 WO2016016185A1 (fr) 2014-07-29 2015-07-27 Soupape d'un circuit de fluide d'un véhicule automobile

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WO (1) WO2016016185A1 (fr)

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DE102015213857A1 (de) * 2015-07-22 2017-01-26 Volkswagen Aktiengesellschaft Kühlmittelverteilungsmodul für einen Kühlmittelkreislauf
CN107542948B (zh) * 2016-06-29 2020-04-28 浙江三花汽车零部件有限公司 电动阀
DE102018111139A1 (de) 2018-05-09 2019-11-14 Elringklinger Ag Ventileinrichtung
DE102021109739B4 (de) 2021-04-19 2023-10-26 Audi Aktiengesellschaft Zentralventileinrichtung mit drehbarem Verstellelement für ein Kühlsystem eines Kraftfahrzeugs, Kühlsystem und Elektrofahrzeug mit einem solchen Kühlsystem

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US5950576A (en) * 1998-06-30 1999-09-14 Siemens Canada Limited Proportional coolant valve
DE19932313A1 (de) * 1999-07-10 2001-01-18 Daimler Chrysler Ag Steuervorrichtung für den Kühl- und Heizungskreislauf einer Brennkraftmaschine
FR2817011A1 (fr) * 2000-11-17 2002-05-24 Coutier Moulage Gen Ind Dispositif de distribution et de regulation d'un fluide

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DE10351852A1 (de) 2003-11-06 2005-06-16 Itw Automotive Products Gmbh & Co. Kg Kühlsystem für Verbrennungskraft in Maschinen, insbesondere für Automobile
DE102006050826B4 (de) 2006-10-27 2010-07-29 Audi Ag Drehschieber mit mehreren Querschnittsverstellgliedern
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Publication number Priority date Publication date Assignee Title
JPS58108670U (ja) * 1982-01-20 1983-07-23 スズキ株式会社 カ−ヒ−タ−用温水調節バルブ
US5950576A (en) * 1998-06-30 1999-09-14 Siemens Canada Limited Proportional coolant valve
DE19932313A1 (de) * 1999-07-10 2001-01-18 Daimler Chrysler Ag Steuervorrichtung für den Kühl- und Heizungskreislauf einer Brennkraftmaschine
FR2817011A1 (fr) * 2000-11-17 2002-05-24 Coutier Moulage Gen Ind Dispositif de distribution et de regulation d'un fluide

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