Unit for moulding containers having a cooling circuit for the saddle

Abstract

The present invention relates to a moulding unit for manufacturing a container from a plastics preform, this moulding unit comprising at least: a mould having, at a lower end, a lower opening; a mould base (8) which fits into the lower opening and has an upper surface defining an at least partial impression of the bottom of the container, the mould base (8) having an opening at its centre; a hydraulic cylinder comprising a piston and a rod at the end of which an insert is mounted, which insert is able to slide through the opening in the mould base (8); and a saddle (14) on which the mould base (8) is mounted, the saddle (14) comprising at least a lower stage (14A) and an upper stage (14B) mounted on the lower stage (14A), the saddle (14) internally defining a housing in which the piston of the hydraulic cylinder is mounted. The moulding unit is noteworthy in that the saddle (14) comprises at least one cooling circuit (20) comprising at least two pipes (21) in which a cooling fluid circulates and which extend through substantially cylindrical bores (22) made in the wall of the lower stage (14A) and the upper stage (14B) of the saddle (14), the external diameter of the pipes (21) being smaller than the internal diameter of the cylindrical bores (22) in order to form a secondary cooling circuit in which air circulates.

Description

Container molding unit with saddle cooling circuit

[0001] The present invention relates to the manufacture of containers, such as bottles, which are produced by stretch-blow molding from plastic preforms (mainly thermoplastic, for example PET or recycled PET known as rPET), and more particularly relates to a molding unit comprising at least one adjustment spacer making it possible to avoid adjustments on the machine after a change in preform format in particular. State of the art

[0002] In the field of packaging, it is well known that a container comprises a wall portion (usually cylindrical in shape), an open neck at an upper end of the wall portion, and a closed bottom at a lower end of the wall portion.

[0003] The manufacture of a container by blow molding generally comprises inserting a preform, also commonly referred to as a blank, into a molding unit having a mold sidewall defining a counter-cavity of the wall portion of the container and a mold bottom defining a counter-cavity of the bottom of the container, said preform having been previously heated to a temperature above the glass transition temperature of the material, and injecting into the hot preform a fluid (such as air) under pressure. Blow molding may be (and generally is) completed by stretching the preform by means of a sliding rod called a stretching rod which is introduced into the preform.

[0004] Thus, blow molding while being stretched in the longitudinal direction by a coaxially provided stretching rod is well known. However, this type of method for manufacturing a container by stretch-blow molding has the disadvantage of causing an offset of the preform and / or the container during blowing, said offset being caused by the lateral oscillation of the preform due to the vibration phenomenon induced by the air pressure blown into the preform, so that this results in an uneven thickness of the walls of the hollow container thus obtained. Furthermore, this type of method also does not allow the parameters to be adjusted to obtain a development speed induced by pre-blowing or blowing greater than that of longitudinal stretching, so that, at the end, the center of the bottom of the preform, also called the injection point, is offset relative to the center of the bottom of the bottle.

[0005] To overcome this drawback, it has already been considered to pinch the bottom of the preform between the stretching rod and a counter-rod extending from the bottom of the mold during blowing. This is the case in particular in documents US4547333 and JP10071641.

[0006] Said documents US4547333 and JP H10 71641 describe a method for manufacturing containers by stretch-blow molding from plastic preforms, said preforms being previously heated, in which the base of the preform is held by an inner stretching rod, extending into the preform, and an outer counter-rod, extending coaxially with the stretching rod from the mold bottom and bearing on the outer wall of the base of the preform, and the blow molding is carried out while simultaneously stretching the preform in the longitudinal direction by the stretching rod and retracting the counter-rod.By stretching in the longitudinal axis direction and blow molding in a state in which the lower part of the preform is clamped and fixed by a stretching rod and a counter rod, the uneven distribution of wall thickness at the time of container formation is alleviated and, at the same time, the lateral oscillation due to the pressure of the blowing air is eliminated and the injection point remains centered on the axis because it is held between the stretching rod and the counter rod, thereby preventing uneven wall thickness of the containers in the circumferential direction as well.

[0007] Furthermore, as the amount of material required to manufacture each container is continually decreasing over the years for economic and environmental reasons, it is necessary to improve the structural rigidity of the container.

[0008] The improvement of the structural rigidity of the wall portion is achieved in a known manner by means of a series of annular grooves forming stiffeners whose function is to minimize the risk of ovalization of the container (i.e. the deformation of the section of the container from a circular shape to an oval shape).

[0009] Several techniques are also known to ensure the structural rigidity of the container bottom. One technique involves providing the container bottom with stiffening artifacts such as ribs, whose function is to minimize the risk of the bottom collapsing under bending stresses due to the hydrostatic pressure of the contents and, possibly, the weight of stacked containers on the same pallet.

[0010] Another technique is to provide additional stretching of the container bottom material to mechanically increase its crystallinity (and thus its mechanical rigidity). As indicated in published PCT application WO 99 / 52701, this is generally achieved by means of a movable mold bottom slidably mounted relative to the mold sidewall, so that the container material is first blown past the final shape in a retracted position of the mold base and then stamped to the final shape by moving the mold bottom to a raised position in which it completes, together with the mold sidewall, the counter-impression of the container. The molding unit comprises a cylindrical shell and at least a portion of the mold bottom has a cylindrical support slidably received in the cylindrical shell.

[0011] The mold bottom is typically moved by means of a linear actuator such as a hydraulic or pneumatic cylinder, comprising a cylindrical housing and a rod which is slidably mounted within the housing and to which the mold bottom cylinder liner is attached.

[0012] However, all these prior art molding units have the disadvantage of only having mold bottom cooling. However, the saddle on which the mold bottom is mounted is also likely to heat up, deteriorating its operation over time. Disclosure of the invention

[0013] One of the aims of the invention is therefore to remedy these drawbacks by proposing a molding unit of simple and inexpensive design, comprising a cooling circuit for the saddle of said molding unit.

[0014] For this purpose and in accordance with the invention, a molding unit is proposed for manufacturing a container from a plastic preform, this molding unit comprising at least: a mold comprising a wall formed by two articulated half-molds defining an internal cavity distributed around a main axis of the mold and defining at least partially an imprint for a side wall or body and having, at a lower end, a lower opening, a mold base which has just fitted into the lower opening and has an upper surface defining at least a partial imprint of the bottom of the container, the mold base being pierced in its center with an opening, a cylinder comprising a piston and a rod at the end of which is mounted an insert capable of sliding through said passage,between a so-called deployed position in which a free end of the insert projects relative to the mold base and a so-called retracted position in which the free end of the insert is located in the vicinity of the mold base, and a saddle on which the mold base is mounted, said saddle comprising at least one lower stage and an upper stage mounted on the lower stage, said saddle internally defining a housing in which the piston of the jack is mounted; said molding unit is remarkable in that said saddle comprises at least one cooling circuit comprising at least two pipes, in which a cooling fluid circulates, extending through substantially cylindrical bores made in the wall of the lower stage and the upper stage of the saddle, the external diameter of the pipes being less than the internal diameter of the cylindrical bores to form a secondary cooling circuit,in which air circulates.,

[0015] Advantageously, each bore comprises an internal sleeve, the thickness of said sleeve being less than the space separating the external wall of the pipe and the internal wall of the bore.

[0016] Preferably, the conduits extend coaxially in the bores.

[0017] Furthermore, the shirt is obtained in a different material from the material in which the saddle is obtained.

[0018] Preferably, the jacket is obtained from a material whose thermal conductivity is greater than the thermal conductivity of the material from which the pipe is obtained.

[0019] The said jacket is obtained from a material whose thermal conductivity is greater than or equal to 180 W / mK at 20°C.

[0020] For example, the said shirt is obtained in aluminum or an aluminum alloy.

[0021] Furthermore, each pipe is obtained in stainless steel.

[0022] Advantageously, the ends of each bore are provided with so-called sealing parts provided with at least two blind holes into which the free ends of the pipes are fitted. These so-called sealing parts advantageously make it possible to reduce the contact between the cooling circuit and the various parts of the saddle.

[0023] In addition, the ends of the bores of the lower stage and the upper stage of the saddle are provided with a shoulder into which said sealing part is fitted.

[0024] Each sealing part is advantageously obtained in polyetheretherketone called PEEK according to the English acronym PolyEtherEtherKetone”, PEEK being compatible with the Glycol / water mixture which is generally used as the cooling fluid.

[0025] Furthermore, each blind hole of each sealing part has at least one annular groove in which an O-ring is positioned.

[0026] In addition, the side wall and / or the top wall and / or the bottom wall of each sealing part comprises at least one groove in which a sealing gasket is positioned.

[0027] Another subject of the invention relates to a saddle intended to receive a mold base of a molding unit for manufacturing a container from a plastic preform, said molding unit comprising at least: a mold comprising a wall formed by two articulated half-molds defining an internal cavity distributed around a main axis of the mold and defining at least partially an imprint for a side wall or body and having, at a lower end, a lower opening, a mold base which has just fitted into the lower opening and has an upper surface defining at least a partial imprint of the bottom of the container, the mold base being pierced in its center with an opening, a cylinder comprising a piston and a rod at the end of which is mounted an insert capable of sliding through said passage,between a so-called deployed position in which a free end of the insert projects relative to the mold base and a so-called retracted position in which the free end of the insert is located in the vicinity of the mold base, and a saddle on which the mold base is mounted, said saddle comprising at least one lower stage and an upper stage mounted on the lower stage, said saddle internally defining a housing in which the piston of the jack is mounted; said saddle is remarkable in that said saddle comprises at least one cooling circuit comprising at least two pipes, in which a cooling fluid circulates, extending through substantially cylindrical bores made in the wall of the lower stage and the upper stage of the saddle, the external diameter of the pipes being less than the internal diameter of the cylindrical bores to form a secondary cooling circuit,in which air circulates.,

[0028] Advantageously, each bore comprises an internal sleeve, the thickness of said sleeve being less than the space separating the external wall of the pipe and the internal wall of the bore.

[0029] Preferably, the conduits extend coaxially in the bores.

[0030] Furthermore, the shirt is obtained in a different material from the material in which the saddle is obtained.

[0031] Preferably, the jacket is obtained from a material whose thermal conductivity is greater than the thermal conductivity of the material from which the pipe is obtained.

[0032] The said jacket is obtained from a material whose thermal conductivity is greater than or equal to 180 W / mK at 20°C.

[0033] For example, the said shirt is obtained in aluminum or an aluminum alloy.

[0034] Furthermore, each pipe is obtained in stainless steel.

[0035] Advantageously, the ends of each bore are provided with so-called sealing parts provided with at least two blind holes into which the free ends of the pipes are fitted. These so-called sealing parts advantageously make it possible to reduce the contact between the cooling circuit and the various parts of the saddle.

[0036] In addition, the ends of the bores of the lower stage and the upper stage of the saddle are provided with a shoulder into which said sealing part is fitted.

[0037] Each sealing part is advantageously obtained in polyetheretherketone called PEEK according to the English acronym PolyEtherEtherKetone”, PEEK being compatible with the Glycol / water mixture which is generally used as the cooling fluid.

[0038] Furthermore, each blind hole of each sealing part has at least one annular groove in which an O-ring is positioned.

[0039] In addition, the side wall and / or the top wall and / or the bottom wall of each sealing part comprises at least one groove in which a sealing gasket is positioned.

[0040] Other advantages and characteristics will emerge more clearly from the following description of several variant embodiments, given as non-limiting examples, of the molding unit according to the invention, with reference to the appended drawings in which:

[0041] is a perspective view of the molding unit according to the invention,

[0042] is a radial sectional view of the molding unit according to the invention shown in the,

[0043] is a transparent perspective view of the saddle of the molding unit according to the invention,

[0044] is an elevation view of the cooling circuit of the saddle of the molding unit according to the invention,

[0045] is a radial sectional view of the saddle of the molding unit according to the invention,

[0046] is an elevation view of a detail of the cooling circuit of the saddle of the molding unit according to the invention,

[0047] is a perspective view from below of the mold base of the saddle of the molding unit according to the invention,

[0048] is a radial sectional view of the mold bottom and the upper end of the saddle of the molding unit according to the invention. Method of carrying out the invention

[0049] In the following description of the molding unit according to the invention, the same numerical references designate the same elements. The different views are not necessarily drawn to scale.

[0050] Figures 1 and 2 show a molding unit 1 for manufacturing a container by blow molding (or stretch blow molding) from a blank 2 made of plastic material. In the example illustrated, the blank 2 is a preform, but it could be an intermediate container obtained from a preform having undergone one or more preliminary forming operations. According to a preferred embodiment, the material from which the blank is made is PET and / or rPET (recycled PET).

[0051] Said molding unit 1 comprises, firstly, a mold 3. This mold 3 comprises a wall 4 formed by two articulated half-molds 3A, 3B, defining an internal cavity 5 distributed around a main axis of the mold 3 which, when the containers to be formed are symmetrical in revolution, forms an axis of symmetry of the mold 3.

[0052] The cavity 5 at least partially defines an imprint 6 for a side wall or body of the container. The wall 4 has an opening 7 defining a passage for a mold base 8 provided with a central opening 9 and comprising an insert 10 mounted to move relative to the mold base 8 between a retracted position in which the insert 10 is spaced from the opening 9 (and therefore extends back relative to the cavity 5), and a deployed position in which the insert 10 at least partially projects from the mold base 8 into the cavity 5.

[0053] Said mold base 8 has a molding surface 9 defining an imprint for the relevant part of the container 2. In the deployed position, the insert 10 projects from the mold base 8, thus completing the imprint of the container, against which the material is applied during blowing. The distance separating the retracted position from the deployed position is called the "stroke" of the insert 10. For the sake of clarity, the mold 3 has been shown in a configuration where the stroke of the insert 10 is relatively large compared to the height of the container. This configuration is in no way limiting; on the contrary, the stroke of the insert 10 may be small compared to the height of the container without departing from the scope of the invention.

[0054] As illustrated in the, the blank 2, then the container formed from it, rest on an upper face of the mold 3 by means of a collar 11 of the blank 2 (respectively of the container), which delimits a neck 12 of the blank 2 (respectively of the container), held outside the mold 3. Under the collar 11, the blank 2 (then the container) has a body 13, which extends generally in the axial direction, and a bottom 14, which is initially hemispherical, then, once formed against the mold bottom 8, extends generally in the radial direction from a lower end of the body 13.

[0055] To form the container, the blank 2 is introduced into the mold 3, and a fluid (preferably a gas, for example air) is injected under pressure. Conventionally, the forming can comprise at least two phases, namely: a pre-blowing phase, during which a fluid is injected into the blank 2 at a so-called pre-blowing pressure (the pre-blowing pressure usually being less than or equal to 15 bars, and for example of the order of 7 to 12 bars), and a blowing phase during which a fluid is injected into the blank 2 at a so-called blowing pressure (the blowing pressure being greater than or equal to 15 bars, and for example of the order of 30 to 40 bars).

[0056] Furthermore, the molding unit 1 also comprises a stretching rod, not shown in the figures, capable of extending inside the blank 2, coaxially with the longitudinal axis of said blank 2, and of being moved along said longitudinal axis, in order to stretch said blank 2 during the pre-blowing step, in particular in a manner well known per se.

[0057] The molding unit 1 comprises, secondly, a boxing system called a saddle 14. The term "boxing" is used here to designate an operation of pushing back the material of the container during forming. This saddle 14 comprises, firstly, a jack 15 for controlling the position of the insert 10 of the mold base 8 which is secured to the upper end of said saddle 14.

[0058] Said jack 15 comprises a piston 16 extending in a housing 17 made in the saddle 14 and a rod 18 carrying at its upper end said insert 10. The piston 16 and the rod 18 are integrally movable relative to the jack body formed by the housing 17 made in the saddle between a retracted position, corresponding to the retracted position of the insert 10 of the mold base 8, and a deployed position, corresponding to the deployed position of said insert 10 of the mold base 8.

[0059] Furthermore, with reference to Figures 3 to 5, said saddle 14 comprises at least one lower stage 14A and an upper stage 14B mounted on the lower stage, said saddle 14 internally defining a housing 17 in which the piston 16 of the jack 15 is mounted. In this particular embodiment, said saddle 14 also comprises a spacer 19 mounted removably between the lower stage 14A and the upper stage 14B, said spacer 19 advantageously making it possible to adapt the molding unit 1 to preforms 2 of different dimensions.

[0060] Advantageously, said saddle 14 comprises at least one cooling circuit 20 comprising at least two pipes 21, an intake pipe 21A and an exhaust pipe 21B, in which a cooling fluid circulates.

[0061] Said cooling fluid consists for example of a Glycol / water mixture; however, it is obvious that said cooling fluid may consist of any other cooling fluid well known to those skilled in the art without departing from the scope of the invention.

[0062] Said conduits 21 extend through substantially cylindrical bores 22 made in the wall of the lower stage 14A and the upper stage 14B of the saddle 14, the external diameter of the conduits 21 being less than the internal diameter of the cylindrical bores 22 to form a secondary cooling circuit 23, in which air circulates. In order to allow the circulation of air in the secondary cooling circuit 23, said saddle 14 comprises air inlets 24 and air outlets 25 made in the side wall of the saddle and which open into the space formed between the conduits 21 and the bores 22.

[0063] Advantageously, each bore 22 comprises an internal sleeve 26, the thickness of said sleeve 26 being less than the space separating the external wall of the pipe 21 and the internal wall of the bore 22. This sleeve 26 is obtained from a material different from the material from which the saddle 14 is obtained.

[0064] Preferably, the jacket 26 is obtained from a material whose thermal conductivity is greater than the thermal conductivity of the material from which the pipe 21 is obtained. More particularly, said jacket 26 is obtained from a material whose thermal conductivity is greater than or equal to 180 W / mK at 20°C.

[0065] For example, said jacket 26 is obtained from aluminum or an aluminum alloy. Furthermore, each pipe 21 is obtained from stainless steel.

[0066] Advantageously, the ends of each bore 22 are provided with so-called sealing parts 27 provided with at least two through holes 28 provided with a shoulder, one through hole 28 for each pipe 21, into which the free ends of said pipes 21 are fitted. These so-called sealing parts 27 advantageously make it possible to reduce the contact between the cooling circuit, i.e. the water / glycol mixture which is corrosive, and the different parts of the saddle 14.

[0067] In addition, the ends of the bores 22 of the lower stage 14A and of the upper stage 14B of the saddle 14 are provided with a shoulder 29 in which said sealing part 27 is fitted.

[0068] Each sealing part is advantageously obtained in polyetheretherketone called PEEK according to the English acronym PolyEtherEtherKetone”, PEEK being compatible with the Glycol / water mixture, i.e. PEEK is not corroded by said Glycol / water mixture.

[0069] Furthermore, each through hole 28 of each sealing part 27 comprises at least one annular groove 30 in which an O-ring 31 is positioned, said O-ring 31 ensuring the seal between the pipe 21 and the sealing part 27.

[0070] In addition, the side wall and / or the top wall and / or the bottom wall of each sealing part 27 comprises at least one groove 32 in which a sealing gasket 33 is positioned.

[0071] It will be observed that the sealing part 27 positioned at the upper end of the upper stage 14B of the saddle 14 has an annular shape and projects slightly from the upper face of said upper stage 14B of the saddle 14.

[0072] With reference to Figures 4, 5, 7 and 8, the lower face of the mold base 8 comprises a groove 34 winding along two substantially semicircular arcs around the opening 9, through which the insert 10 is movably mounted, said groove 34 extending from a blind hole 35 extending in line with the intake pipe of the cooling circuit to a second blind hole 35 extending in line with the exhaust pipe of said cooling circuit. Thus, said groove 34 makes it possible to circulate the cooling fluid, in this case the glycol / water mixture, from the intake pipe 21A to the exhaust pipe 21B of the cooling circuit 20 while cooling said mold base 8.

[0073] Furthermore, the lower face of the mold base also comprises an annular groove 36 at the periphery of the groove 34, said annular groove 36 receiving a seal 37 which, when the mold base 8 is fixed to the upper stage 14B of the saddle 14, is compressed onto the upper face of the sealing part 27 which projects from the upper end of the upper stage 14B of the saddle 14.

[0074] It goes without saying that the molding unit 1, and more particularly the saddle 14, may also comprise a counter-rod extending through the mold base 8, and more particularly through the insert 10, coaxially with the drawing rod, said counter-rod being capable of being moved from a so-called retracted position in which the upper end of the counter-rod extends inside a vertical channel made in the insert 10 of the mold base 8, the rod 18 and the piston 16, to a so-called active position in which said counter-rod projects from said insert 10 and from said mold base 10, without however departing from the scope of the invention.

[0075] Finally, it is clear that the examples just given are only specific illustrations and are in no way limiting as to the fields of application of the invention.

Claims

Molding unit (1) for manufacturing a container from a preform (2) made of plastic material, this molding unit (1) comprising at least: a mold (3) comprising a wall (4) formed by two articulated half-molds (3A, 3B) defining an internal cavity (5) distributed around a main axis of the mold (3) and defining at least partially an imprint (6) for a side wall or body and having, at a lower end, a lower opening (7), a mold base (8) which fits into the lower opening (7) and has an upper surface defining at least a partial imprint of the bottom of the container, the mold base (8) being pierced in its center with an opening (9), a jack (15) comprising a piston (16) and a rod (18) at the end of which is mounted an insert (10) capable of sliding through said opening (9) of the mold base (8),between a so-called deployed position in which a free end of the insert (10) projects relative to the mold base (8) and a so-called retracted position in which the free end of the insert (10) is located in the vicinity of the mold base (10), and a saddle (14) on which the mold base (8) is mounted, said saddle (14) comprising at least one lower stage (14A) and an upper stage (14B) mounted on the lower stage (14A), said saddle (14) internally defining a housing (17) in which the piston (16) of the jack (15) is mounted, characterized in that said saddle (14) comprises at least one cooling circuit (20) comprising at least two conduits (21), in which a cooling fluid circulates, extending through substantially cylindrical bores (22) made in the wall of the lower stage (14A) and the upper floor (14B) of the saddle (14),the external diameter of the pipes (21) being less than the internal diameter of the cylindrical bores (22) to form a secondary cooling circuit, in which air circulates., Molding unit according to claim 1, characterized in that each bore (22) comprises an internal sleeve (26), the thickness of said sleeve (26) being less than the space separating the external wall of the conduit (21) and the internal wall of the bore (22). Molding unit according to any one of claims 1 or 2, characterized in that the conduits (21) extend coaxially in the bores (22). Molding unit according to any one of claims 2 or 3, characterized in that the jacket (26) is obtained from a material different from the material from which the saddle (14) is obtained. Molding unit according to claim 4, characterized in that the jacket (26) is obtained from a material whose thermal conductivity is greater than the thermal conductivity of the material from which the pipe (21) is obtained. Molding unit according to claim 5, characterized in that the jacket (26) is obtained from a material whose thermal conductivity is greater than or equal to 180 W / mK at 20°C. Molding unit according to any one of claims 5 or 6, characterized in that the jacket (26) is obtained from aluminum or an aluminum alloy. Molding unit according to any one of claims 1 to 7, characterized in that each pipe (26) is obtained from stainless steel. Molding unit according to any one of claims 1 to 8, characterized in that the ends of each bore (22) are provided with so-called sealing parts (27) provided with at least two through holes (28) into which the free ends of the pipes (21) are fitted. Molding unit according to claim 9, characterized in that the ends of the bores (22) of the lower stage (14A) and of the upper stage (14B) of the saddle (14) are provided with a shoulder (29) in which said sealing part (27) is fitted. Molding unit according to any one of claims 9 or 10, characterized in that each sealing part (27) is obtained from polyetheretherketone known as PEEK according to the English acronym PolyEtherEtherKetone. Molding unit according to any one of claims 9 to 11, characterized in that each through hole (28) of each sealing part (27) comprises at least one annular groove (30) in which an O-ring (31) is positioned. Molding unit according to any one of claims 9 to 12, characterized in that the side wall and / or the top wall and / or the bottom wall of each sealing part (27) comprises at least one groove (32) in which a sealing gasket (33) is positioned. Saddle (14) intended to receive a mold base of a molding unit for manufacturing a container from a plastic preform (2), said saddle (14) comprising at least one lower stage (14A) and an upper stage (14B) mounted on the lower stage (14A), said saddle (14) internally defining a housing (17) in which the piston (16) of the jack (15) is mounted, characterized in that said saddle (14) comprises at least one cooling circuit (20) comprising at least two conduits (21), in which a cooling fluid circulates, extending through substantially cylindrical bores (22) made in the wall of the lower stage (14A) and the upper stage (14B) of the saddle (14), the external diameter of the conduits (21) being less than the internal diameter of the cylindrical bores (22) to form a cooling circuit secondary, in which air circulates. Saddle according to claim 14, characterized in that each bore (22) comprises an internal sleeve (26), the thickness of said sleeve (26) being less than the space separating the external wall of the pipe (21) and the internal wall of the bore (22). Saddle according to any one of claims 14 or 15, characterized in that the conduits (21) extend coaxially in the bores (22). Saddle according to any one of claims 15 or 16, characterized in that the jacket (26) is obtained from a material different from the material from which the saddle (14) is obtained. Saddle according to claim 17, characterized in that the jacket (26) is obtained from a material whose thermal conductivity is greater than the thermal conductivity of the material from which the pipe (21) is obtained. Saddle according to claim 18, characterized in that the jacket (26) is obtained from a material whose thermal conductivity is greater than or equal to 180 W / mK at 20°C. Saddle according to any one of claims 18 or 19, characterized in that the sleeve (26) is obtained from aluminum or an aluminum alloy. Saddle according to any one of claims 14 to 20, characterized in that each pipe (21) is obtained from stainless steel. Saddle according to any one of claims 14 to 21, characterized in that the ends of each bore (22) are provided with so-called sealing parts (27) provided with at least two through holes (28) into which the free ends of the pipes (21) are fitted. Saddle according to claim 22, characterized in that the ends of the bores (22) of the lower stage (14A) and of the upper stage (14B) of the saddle (14) are provided with a shoulder (29) in which said sealing part (27) is fitted. Saddle according to any one of claims 22 or 23, characterized in that each sealing part (27) is obtained from polyetheretherketone known as PEEK according to the English acronym PolyEtherEtherKetone. Saddle according to any one of claims 22 to 24, characterized in that each through hole (28) of each sealing part (27) comprises at least one annular groove (30) in which an O-ring (31) is positioned. Saddle according to any one of claims 22 to 25, characterized in that the side wall and / or the upper wall and / or the lower wall of each sealing part (27) comprises at least one groove (32) in which a sealing gasket (33) is positioned.

Images