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EP0791733B1 - Multiple chamber expansion device for a cooling/heating circuit of a vehicle - Google Patents

Multiple chamber expansion device for a cooling/heating circuit of a vehicle Download PDF

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Publication number
EP0791733B1
EP0791733B1 EP97102247A EP97102247A EP0791733B1 EP 0791733 B1 EP0791733 B1 EP 0791733B1 EP 97102247 A EP97102247 A EP 97102247A EP 97102247 A EP97102247 A EP 97102247A EP 0791733 B1 EP0791733 B1 EP 0791733B1
Authority
EP
European Patent Office
Prior art keywords
chamber
casing
edge
duct
groove
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.)
Expired - Lifetime
Application number
EP97102247A
Other languages
German (de)
French (fr)
Other versions
EP0791733A1 (en
Inventor
Klaus Mertens
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.)
Valeo Thermique Moteur SA
Original Assignee
Valeo Thermique Moteur SA
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 Valeo Thermique Moteur SA filed Critical Valeo Thermique Moteur SA
Publication of EP0791733A1 publication Critical patent/EP0791733A1/en
Application granted granted Critical
Publication of EP0791733B1 publication Critical patent/EP0791733B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • F01P7/02—Controlling of coolant flow the coolant being cooling-air
    • F01P7/026—Thermostatic control
    • 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
    • F01P11/00—Component parts, details, or accessories not provided for in, or of interest apart from, groups F01P1/00 - F01P9/00
    • F01P11/02—Liquid-coolant filling, overflow, venting, or draining devices
    • F01P11/029—Expansion reservoirs
    • 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
    • F01P7/16—Controlling of coolant flow the coolant being liquid by thermostatic control
    • 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
    • F01P2025/00—Measuring
    • F01P2025/04—Pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2255/00—Heat exchanger elements made of materials having special features or resulting from particular manufacturing processes
    • F28F2255/14—Heat exchanger elements made of materials having special features or resulting from particular manufacturing processes molded
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2275/00—Fastening; Joining
    • F28F2275/06—Fastening; Joining by welding

Definitions

  • the invention relates to an expansion device for a fluid. coolant circulating in a circuit as known from document EP-A-215 369.
  • Such an expansion device is intended to absorb the variations in the volume of the heat transfer fluid during operation of the circuit, these variations in volume being due to variations in fluid temperature and, where applicable, at its changes of state in the case of a working fluid in the liquid state and in the gaseous state.
  • the gas phase present above the liquid in the first chamber, and that can pass into the second bedroom, is made up of air and / or, if applicable, heat transfer fluid in the state gaseous.
  • the presence of the second chamber reduces the height available in the first room above the minimum level of liquid, which must be locate above the entire cooling / heating circuit, and therefore reduces the space requirement system height.
  • the third chamber collects and condenses the fluid heat carrier in gaseous state which can escape from the second bedroom.
  • the opening pressure of the first valve corresponds to the maximum normal operating pressure of the circuit, and the opening pressure of the second valve corresponds to a pressure not to be exceeded for reasons of security.
  • the different rooms are defined by housings separate, connected together by pipes in the form of separate tubing.
  • the object of the invention is to simplify the structure and the operations for producing the expansion device, and reduce its size.
  • the invention relates in particular to a device as defined in claim 1.
  • the housing 1 shown in the figures has a general shape cylindrical of revolution having a side wall tubular 2 and two end walls 3 and 4 (respectively right and left in figure 1) whose regions are central and perpendicular to axis 5 of the housing and are connected to the side wall 2 by rounded regions.
  • the case is made up of two parts hollow 6 and 7 substantially semi-cylindrical in material molded plastic with thickened peripheral edges respective 8 and 9 by which they are mutually assembled by heat sealing to form a sealed enclosure liquids and gases, divided from right to left into three rooms 10, 11 and 12 by transverse partitions 13 and 14 also formed by the welded assembly of the two parts, the partition 14 being curved on the side of the chamber 12.
  • edges 8 and 9 are joined in a vertical joint plane P1 which is roughly confused with the vertical plane P2 passing by the axis 5.
  • the edges 8 and 9 of the parts 6 and 7 form a belt 15 projecting from the adjacent regions of the housing, surrounding it on its upper sides and lower and on its ends 3 and 4.
  • the belt 15 protrudes from of respective horizontal flats 16 and 17, and is part of the circular profile of the tubular wall 2.
  • the edge 8 has a fork-shaped profile, both of which branches 18 and 19 each have a width equal to the thickness general of the walls of the case.
  • the inner branch 18 is arranged in alignment with the adjacent regions of the wall of the housing, and in particular of the flats 16 and 17 on the upper and lower sides, and the outer branch 19 is substantially parallel to the inner branch 18.
  • the interval between the two branches defines a groove 20.
  • the edge 9 of the part 7 has a thickness equal to that from edge 8 and comes into tight contact, by welding, with the free ends of branches 18 and 19, thus closing the groove 20.
  • notches are provided in the inner branch 18 edge 8, i.e. two notches 21 and 22 on the side upper case, respectively to the right of the partition 13 and between partitions 13 and 14, and two notches 23 and 24 on the lower side, respectively between the partitions 13 and 14 and to the left of the partition 14.
  • the groove is interrupted locally by five bridges of material produced during the molding of part 6, namely four bridges 25 to 28 located respectively immediately to the left of notch 21, immediately to the right of notch 22, immediately to left of notch 23 and immediately right of notch 24, and a bridge 29 located halfway up the end face 4 of the housing.
  • These five bridges delimit in length groove device 20 a first pipe 31 extending to the right along the upper side of the housing from deck 25, then down along the end face 3 and to the left along the bottom side up to bridge 27, and communicating upstream with the chamber 10 by notch 21 and downstream with chamber 11 by the notch 23; a second pipe 32 extending towards the left along the top side of the case from the bridge 26, then down along the end face 4 up to bridge 29, and communicating upstream with room 11 by the notch 22; a third pipe 33 extending towards down along face 4 from deck 29, then towards right along the lower side to bridge 28, and communicating downstream with the chamber 12 by the notch 24.
  • the pipes 32 and 33 are completed by two cavities 34 and 35 also formed in a thickened region of the wall of the housing, on its end face 4, and communicating the groove 20, above and below deck 29, with the entrance and the outlet respectively of a limitation valve pressure 36.
  • the valve 36 comprises known elements, not shown in particular, allowing the passage of gas from line 32 to line 33 only when the pressure in the first of them exceeds a determined value, here 0.4 bar, these elements being housed in a delimited space by an annular wall 37 coming from molding with the part 7, and projecting outward from the housing from its end face 4, and by a removable plug 38.
  • the portions 39 and 40 of the groove 20 included respectively between bridges 25 and 26 and between bridges 27 and 28 constitute isolated cavities.
  • the edge profile 8 of part 6 has a third branch 41 parallel to the branch 18 and offset towards the inside of the case by relative to it, which is separated from it by a groove 42.
  • the groove 42 is closed, in the same way as groove 20, by a region thickened as a consequence of the edge 9 of the part 7.
  • the groove 42 communicates with the chamber 12 at its end upper and is interrupted halfway up face 4 by a material bridge 43 extending the bridge 29. It communicates with the input of a limit valve pressure 44 by a cavity 45 similar to cavities 34 and 35, but located towards the inside of the case relative to the plane general of side 4.
  • the valve 44 is similar to the valve 36, but adjusted for an opening pressure of 0.7 bar. It is arranged symmetrically to the valve 36 by compared to the P2 plane, and its exit communicates with the atmosphere.
  • the housing 1 has a tubing of filling 46 communicating with chamber 10 and provided with a cap 47.
  • Chamber 10 also communicates through an orifice inlet and outlet port not shown with the cooling / heating circuit with which the present expansion device.
  • the grooves defining the pipes can be arranged in both parts forming the housing, the joint plane P1 coinciding then with the plane of symmetry P2.
  • the two bridges 25 and 26 delimiting a neutral portion 39 of the groove 20 can be replaced by a single bridge arranged between the notches 21 and 22, and similarly for bridges 27 and 28.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Housings (AREA)
  • Cooling Or The Like Of Electrical Apparatus (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Air-Conditioning For Vehicles (AREA)

Description

L'invention concerne un dispositif d'expansion pour un fluide caloporteur circulant dans un circuit tel que connu du document EP-A-215 369.The invention relates to an expansion device for a fluid. coolant circulating in a circuit as known from document EP-A-215 369.

Un tel dispositif d'expansion est destiné à absorber les variations de volume du fluide caloporteur lors du fonctionnement du circuit, ces variations de volume étant dues aux variations de température du fluide et le cas échéant à ses changements d'état lorsqu'il s'agit d'un fluide fonctionnant à l'état liquide et à l'état gazeux. La phase gazeuse présente au-dessus du liquide dans la première chambre, et pouvant passer dans la seconde chambre, est constituée par de l'air et/ou, le cas échéant, du fluide caloporteur à l'état gazeux. La présence de la seconde chambre permet de diminuer la hauteur disponible dans la première chambre au-dessus du niveau minimal de liquide, lequel doit impérativement se situer au-dessus de l'ensemble du circuit de refroidissement/chauffage, et réduit par conséquent l'encombrement en hauteur du système.Such an expansion device is intended to absorb the variations in the volume of the heat transfer fluid during operation of the circuit, these variations in volume being due to variations in fluid temperature and, where applicable, at its changes of state in the case of a working fluid in the liquid state and in the gaseous state. The gas phase present above the liquid in the first chamber, and that can pass into the second bedroom, is made up of air and / or, if applicable, heat transfer fluid in the state gaseous. The presence of the second chamber reduces the height available in the first room above the minimum level of liquid, which must be locate above the entire cooling / heating circuit, and therefore reduces the space requirement system height.

Il est également connu de prévoir une troisième chambre et au moins une seconde conduite reliant les seconde et troisième chambres par l'intermédiaire de la première soupape, et une seconde soupape de limitation de pression propre à s'ouvrir pour laisser le gaz s'échapper de la troisième chambre lorsque sa pression y atteint une seconde valeur déterminée supérieure à la première valeur déterminée. La troisième chambre permet de recueillir, et de condenser, le fluide caloporteur à l'état gazeux qui peut s'échapper de la seconde chambre. La pression d'ouverture de la première soupape correspond à la pression maximale de fonctionnement normal du circuit, et la pression d'ouverture de la seconde soupape correspond à une pression à ne pas dépasser pour des raisons de sécurité.It is also known to provide a third bedroom and minus a second line connecting the second and third chambers through the first valve, and a second pressure relief valve capable of opening to let gas escape from the third chamber when its pressure reaches a second determined value there greater than the first determined value. The third chamber collects and condenses the fluid heat carrier in gaseous state which can escape from the second bedroom. The opening pressure of the first valve corresponds to the maximum normal operating pressure of the circuit, and the opening pressure of the second valve corresponds to a pressure not to be exceeded for reasons of security.

Dans les dispositifs d'expansion à chambres multiples connus, les différentes chambres sont définies par des boítiers distincts, reliés entre eux par des conduites sous forme de tubulures séparées.In known multi-chamber expansion devices, the different rooms are defined by housings separate, connected together by pipes in the form of separate tubing.

Le but de l'invention est de simplifier la structure et les opérations de réalisation du dispositif d'expansion, et de réduire son encombrement.The object of the invention is to simplify the structure and the operations for producing the expansion device, and reduce its size.

L'invention vise notamment un dispositif tel que défini dans la revendication 1.The invention relates in particular to a device as defined in claim 1.

Des caractéristiques optionnelles de l'invention, complémentaires ou alternatives, sont énoncées ci-après :

  • La première conduite est ménagée au sein d'une portion épaissie de la paroi extérieure du boítier.
  • Le boítier est formé d'au moins deux pièces moulées creuses assemblées bord à bord de façon étanche, notamment par collage ou par soudage, une rainure étant ménagée le long du bord à assembler d'une première au moins desdites pièces pour former la première conduite.
  • Le boítier définit des seconde et troisième conduites reliant respectivement les seconde et troisième chambres à la première soupape, et une quatrième conduite reliant la troisième chambre à la seconde soupape, toutes ménagées au sein de portions épaissies de la paroi extérieure du boítier.
  • Le boítier a une forme allongée horizontalement, de section transversale sensiblement uniforme, les trois chambres étant alignées entre une première extrémité et la seconde extrémité du boítier et séparées les unes des autres par deux cloisons transversales.
  • Le boítier comprend deux pièces mutuellement assemblées en un plan de joint longitudinal, les quatre conduites s'étendant selon le plan de joint.
  • Le plan de joint est sensiblement vertical et la première conduite s'étend, sous forme d'une rainure ménagée le long du bord de ladite première pièce, depuis une zone de jonction avec la première chambre située sur le côté supérieur dudit bord jusqu'à une zone de jonction avec la seconde chambre située sur le côté inférieur dudit bord, en passant par ladite première extrémité, la troisième chambre étant adjacente à ladite seconde extrémité.
  • Les première et seconde soupapes sont disposées extérieurement sur la seconde extrémité du boítier, respectivement de part et d'autre du plan de joint.
  • Les première, seconde et troisième chambres sont alignées dans cet ordre entre les première et seconde extrémités du boítier.
  • Les seconde et troisième conduites s'étendent respectivement, sous forme d'une première rainure ménagée le long du bord de ladite première pièce, depuis une zone de jonction avec la seconde chambre située sur le côté supérieur dudit bord jusqu'à ladite seconde extrémité, et depuis cette dernière, au-dessous de la seconde conduite, jusqu'à une zone de jonction avec la troisième chambre située sur le côté inférieur dudit bord, ladite rainure étant interrompue par un pont de matière obtenu de moulage pour séparer l'une de l'autre les seconde et troisième conduites à la seconde extrémité, et reliée à l'entrée et à la sortie de la première soupape, au-dessus et au-dessous dudit pont, par des cavités respectives ménagées dans la paroi du boítier.
  • La quatrième conduite est formée par une seconde rainure ménagée dans le bord de la première pièce à la seconde extrémité du boítier, juxtaposée, vers l'intérieur du boítier, à la région de la première rainure définissant la seconde conduite, communiquant avec la troisième chambre à son extrémité supérieure et fermée à son extrémité inférieure, cette dernière étant reliée à l'entrée de la seconde soupape par une cavité ménagée dans la paroi du boítier.
  • La première rainure s'étend sensiblement sur toute la longueur périphérique du bord de la première pièce pour former les première, seconde et troisième conduites et comporte, outre l'interruption à la seconde extrémité séparant les seconde et troisième conduites, au moins une interruption sur le côté supérieur entre les extrémités amont des première et seconde conduites et au moins une interruption sur le côté inférieur entre les extrémités aval des première et troisième conduites.
Optional, complementary or alternative features of the invention are set out below:
  • The first pipe is formed within a thickened portion of the outer wall of the housing.
  • The housing is formed of at least two hollow molded parts assembled edge to edge in a sealed manner, in particular by gluing or welding, a groove being formed along the edge to be assembled from at least one of said parts to form the first pipe. .
  • The housing defines second and third lines respectively connecting the second and third chambers to the first valve, and a fourth line connecting the third chamber to the second valve, all formed within thickened portions of the outer wall of the housing.
  • The housing has a horizontally elongated shape, of substantially uniform cross section, the three chambers being aligned between a first end and the second end of the housing and separated from each other by two transverse partitions.
  • The housing comprises two parts mutually assembled in a longitudinal joint plane, the four pipes extending along the joint plane.
  • The joint plane is substantially vertical and the first pipe extends, in the form of a groove formed along the edge of said first part, from a junction zone with the first chamber located on the upper side of said edge up to a junction zone with the second chamber located on the lower side of said edge, passing through said first end, the third chamber being adjacent to said second end.
  • The first and second valves are arranged externally on the second end of the housing, respectively on either side of the joint plane.
  • The first, second and third chambers are aligned in this order between the first and second ends of the housing.
  • The second and third conduits extend respectively, in the form of a first groove formed along the edge of said first part, from a zone of junction with the second chamber located on the upper side of said edge to said second end, and from the latter, below the second pipe, to a zone of junction with the third chamber located on the lower side of said edge, said groove being interrupted by a bridge of material obtained from molding to separate one of the other the second and third lines at the second end, and connected to the inlet and outlet of the first valve, above and below said bridge, by respective cavities formed in the wall of the housing.
  • The fourth pipe is formed by a second groove formed in the edge of the first part at the second end of the case, juxtaposed, towards the inside of the case, at the region of the first groove defining the second pipe, communicating with the third chamber. at its upper end and closed at its lower end, the latter being connected to the inlet of the second valve by a cavity formed in the wall of the housing.
  • The first groove extends substantially over the entire peripheral length of the edge of the first part to form the first, second and third conduits and comprises, in addition to the interruption at the second end separating the second and third conduits, at least one interruption on the upper side between the upstream ends of the first and second pipes and at least one interruption on the lower side between the downstream ends of the first and third pipes.

Les caractéristiques et avantages de l'invention seront exposés plus en détail dans la description ci-après, en se référant aux dessins annexés, sur lesquels:

  • la figure 1 est une vue en coupe longitudinale du boítier d'un dispositif d'expansion selon l'invention;
  • la figure 2 est une vue en bout depuis le côté gauche de la figure 1;
  • la figure 3 est une vue en coupe selon la ligne III-III de la figure 1; et
  • la figure 4 est un détail agrandi de la figure 3.
The characteristics and advantages of the invention will be explained in more detail in the description below, with reference to the accompanying drawings, in which:
  • Figure 1 is a longitudinal sectional view of the housing of an expansion device according to the invention;
  • Figure 2 is an end view from the left side of Figure 1;
  • Figure 3 is a sectional view along line III-III of Figure 1; and
  • FIG. 4 is an enlarged detail of FIG. 3.

Le boítier 1 représenté sur les figures a une forme générale cylindrique de révolution présentant une paroi latérale tubulaire 2 et deux parois d'extrémités 3 et 4 (respectivement à droite et à gauche sur la figure 1) dont les régions centrales sont planes et perpendiculaires à l'axe 5 du boítier et se raccordent à la paroi latérale 2 par des régions arrondies. Le boítier est composé de deux pièces creuses 6 et 7 sensiblement semi-cylindriques en matière plastique moulée, présentant des bords périphériques épaissis respectifs 8 et 9 par lesquels elles sont mutuellement assemblées par thermosoudage pour former une enceinte étanche aux liquides et aux gaz, divisée de droite à gauche en trois chambres 10, 11 et 12 par des cloisons transversales 13 et 14 formées elles aussi par l'assemblage soudé des deux pièces, la cloison 14 étant bombée du côté de la chambre 12. Les bords 8 et 9 sont accolés dans un plan de joint vertical P1 qui est à peu près confondu avec le plan vertical P2 passant par l'axe 5. Les bords 8 et 9 des pièces 6 et 7 forment une ceinture 15 en saillie par rapport aux régions adjacentes du boítier, entourant celui-ci sur ses côtés supérieur et inférieur et sur ses extrémités 3 et 4. Sur les côtés supérieur et inférieur, la ceinture 15 fait saillie à partir de méplats horizontaux respectifs 16 et 17, et s'inscrit dans le profil circulaire de la paroi tubulaire 2. Le bord 8 présente un profil en forme de fourche, dont les deux branches 18 et 19 ont chacune une largeur égale à l'épaisseur générale des parois du boítier. La branche intérieure 18 est disposée dans l'alignement des régions adjacentes de la paroi du boítier, et en particulier des méplats 16 et 17 sur les côtés supérieur et inférieur, et la branche extérieure 19 est sensiblement parallèle à la branche intérieure 18. The housing 1 shown in the figures has a general shape cylindrical of revolution having a side wall tubular 2 and two end walls 3 and 4 (respectively right and left in figure 1) whose regions are central and perpendicular to axis 5 of the housing and are connected to the side wall 2 by rounded regions. The case is made up of two parts hollow 6 and 7 substantially semi-cylindrical in material molded plastic with thickened peripheral edges respective 8 and 9 by which they are mutually assembled by heat sealing to form a sealed enclosure liquids and gases, divided from right to left into three rooms 10, 11 and 12 by transverse partitions 13 and 14 also formed by the welded assembly of the two parts, the partition 14 being curved on the side of the chamber 12. The edges 8 and 9 are joined in a vertical joint plane P1 which is roughly confused with the vertical plane P2 passing by the axis 5. The edges 8 and 9 of the parts 6 and 7 form a belt 15 projecting from the adjacent regions of the housing, surrounding it on its upper sides and lower and on its ends 3 and 4. On the sides upper and lower, the belt 15 protrudes from of respective horizontal flats 16 and 17, and is part of the circular profile of the tubular wall 2. The edge 8 has a fork-shaped profile, both of which branches 18 and 19 each have a width equal to the thickness general of the walls of the case. The inner branch 18 is arranged in alignment with the adjacent regions of the wall of the housing, and in particular of the flats 16 and 17 on the upper and lower sides, and the outer branch 19 is substantially parallel to the inner branch 18.

L'intervalle entre les deux branches définit une rainure 20. Le bord 9 de la pièce 7 présente une épaisseur égale à celle du bord 8 et vient en contact étanche, par soudage, avec les extrémités libres des branches 18 et 19, fermant ainsi la rainure 20.The interval between the two branches defines a groove 20. The edge 9 of the part 7 has a thickness equal to that from edge 8 and comes into tight contact, by welding, with the free ends of branches 18 and 19, thus closing the groove 20.

Quatre encoches sont ménagées dans la branche intérieure 18 du bord 8, à savoir deux encoches 21 et 22 sur le côté supérieur du boítier, respectivement à droite de la cloison 13 et entre les cloisons 13 et 14, et deux encoches 23 et 24 sur le côté inférieur, respectivement entre les cloisons 13 et 14 et à gauche de la cloison 14. Par ailleurs, la rainure est interrompue localement par cinq ponts de matière réalisés lors du moulage de la pièce 6, à savoir quatre ponts 25 à 28 situés respectivement immédiatement à gauche de l'encoche 21, immédiatement à droite de l'encoche 22, immédiatement à gauche de l'encoche 23 et immédiatement à droite de l'encoche 24, et un pont 29 situé à mi-hauteur de la face d'extrémité 4 du boítier. Ces cinq ponts délimitent dans la longueur périphérique de la rainure 20 une première conduite 31 s'étendant vers la droite le long du côté supérieur du boítier à partir du pont 25, puis vers le bas le long de la face d'extrémité 3 et vers la gauche le long du côté inférieur jusqu'au pont 27, et communiquant en amont avec la chambre 10 par l'encoche 21 et en aval avec la chambre 11 par l'encoche 23; une seconde conduite 32 s'étendant vers la gauche le long du côté supérieur du boítier à partir du pont 26, puis vers le bas le long de la face d'extrémité 4 jusqu'au pont 29, et communiquant en amont avec la chambre 11 par l'encoche 22; une troisième conduite 33 s'étendant vers le bas le long de la face 4 à partir du pont 29, puis vers la droite le long du côté inférieur jusqu'au pont 28, et communiquant en aval avec la chambre 12 par l'encoche 24. Les conduites 32 et 33 sont complétées par deux cavités 34 et 35 ménagées elles aussi dans une région épaissie de la paroi du boítier, sur sa face d'extrémité 4, et faisant communiquer la rainure 20, au-dessus et au-dessous du pont 29, avec l'entrée et la sortie respectivement d'une soupape de limitation de pression 36. La soupape 36 comprend des éléments connus, non représentés en particulier, permettant le passage de gaz de la conduite 32 à la conduite 33 seulement lorsque la pression dans la première d'entre elles excède une valeur déterminée, ici 0,4 bar, ces éléments étant logés dans un espace délimité par une paroi annulaire 37 venue de moulage avec la pièce 7, et faisant saillie vers l'extérieur du boítier à partir de sa face d'extrémité 4, et par un bouchon amovible 38. Les portions 39 et 40 de la rainure 20 comprises respectivement entre les ponts 25 et 26 et entre les ponts 27 et 28 constituent des cavités isolées.Four notches are provided in the inner branch 18 edge 8, i.e. two notches 21 and 22 on the side upper case, respectively to the right of the partition 13 and between partitions 13 and 14, and two notches 23 and 24 on the lower side, respectively between the partitions 13 and 14 and to the left of the partition 14. Furthermore, the groove is interrupted locally by five bridges of material produced during the molding of part 6, namely four bridges 25 to 28 located respectively immediately to the left of notch 21, immediately to the right of notch 22, immediately to left of notch 23 and immediately right of notch 24, and a bridge 29 located halfway up the end face 4 of the housing. These five bridges delimit in length groove device 20 a first pipe 31 extending to the right along the upper side of the housing from deck 25, then down along the end face 3 and to the left along the bottom side up to bridge 27, and communicating upstream with the chamber 10 by notch 21 and downstream with chamber 11 by the notch 23; a second pipe 32 extending towards the left along the top side of the case from the bridge 26, then down along the end face 4 up to bridge 29, and communicating upstream with room 11 by the notch 22; a third pipe 33 extending towards down along face 4 from deck 29, then towards right along the lower side to bridge 28, and communicating downstream with the chamber 12 by the notch 24. The pipes 32 and 33 are completed by two cavities 34 and 35 also formed in a thickened region of the wall of the housing, on its end face 4, and communicating the groove 20, above and below deck 29, with the entrance and the outlet respectively of a limitation valve pressure 36. The valve 36 comprises known elements, not shown in particular, allowing the passage of gas from line 32 to line 33 only when the pressure in the first of them exceeds a determined value, here 0.4 bar, these elements being housed in a delimited space by an annular wall 37 coming from molding with the part 7, and projecting outward from the housing from its end face 4, and by a removable plug 38. The portions 39 and 40 of the groove 20 included respectively between bridges 25 and 26 and between bridges 27 and 28 constitute isolated cavities.

Dans la moitié supérieure de la face 4, le profil du bord 8 de la pièce 6 présente une troisième branche 41 parallèle à la branche 18 et décalée vers l'intérieur du boítier par rapport à celle-ci, qui en est séparée par une rainure 42. La rainure 42 est fermée, de la même façon que la rainure 20, par une région épaissie en conséquence du bord 9 de la pièce 7. La rainure 42 communique avec la chambre 12 à son extrémité supérieure et est interrompue à mi-hauteur de la face 4 par un pont de matière 43 prolongeant le pont 29. Elle communique avec l'entrée d'une soupape de limitation de pression 44 par une cavité 45 analogue aux cavités 34 et 35, mais située vers l'intérieur du boítier par rapport au plan général de la face 4. La soupape 44 est semblable à la soupape 36, mais réglée pour une pression d'ouverture de 0,7 bar. Elle est disposée symétriquement à la soupape 36 par rapport au plan P2, et sa sortie communique avec l'atmosphère.In the upper half of face 4, the edge profile 8 of part 6 has a third branch 41 parallel to the branch 18 and offset towards the inside of the case by relative to it, which is separated from it by a groove 42. The groove 42 is closed, in the same way as groove 20, by a region thickened as a consequence of the edge 9 of the part 7. The groove 42 communicates with the chamber 12 at its end upper and is interrupted halfway up face 4 by a material bridge 43 extending the bridge 29. It communicates with the input of a limit valve pressure 44 by a cavity 45 similar to cavities 34 and 35, but located towards the inside of the case relative to the plane general of side 4. The valve 44 is similar to the valve 36, but adjusted for an opening pressure of 0.7 bar. It is arranged symmetrically to the valve 36 by compared to the P2 plane, and its exit communicates with the atmosphere.

De façon classique, le boítier 1 présente une tubulure de remplissage 46 communiquant avec la chambre 10 et munie d'un bouchon 47. La chambre 10 communique également par un orifice d'entrée et un orifice de sortie non représentés avec le circuit de refroidissement/chauffage auquel est associé le présent dispositif d'expansion.Conventionally, the housing 1 has a tubing of filling 46 communicating with chamber 10 and provided with a cap 47. Chamber 10 also communicates through an orifice inlet and outlet port not shown with the cooling / heating circuit with which the present expansion device.

Des modifications peuvent être apportées au dispositif décrit sans sortir de l'invention. Ainsi, les rainures définissant les conduites peuvent être ménagées à la fois dans les deux pièces formant le boítier, le plan de joint P1 coïncidant alors avec le plan de symétrie P2. Les deux ponts 25 et 26 délimitant une portion neutre 39 de la rainure 20 peuvent être remplacés par un seul pont disposé entre les encoches 21 et 22, et semblablement pour les ponts 27 et 28.Modifications can be made to the device described without departing from the invention. So the grooves defining the pipes can be arranged in both parts forming the housing, the joint plane P1 coinciding then with the plane of symmetry P2. The two bridges 25 and 26 delimiting a neutral portion 39 of the groove 20 can be replaced by a single bridge arranged between the notches 21 and 22, and similarly for bridges 27 and 28.

Claims (9)

  1. Expansion device for a heat transfer fluid circulating in a circuit, particularly a cooling and/or heating circuit in a motor vehicle, comprising at least one first chamber (10) and one second chamber (11) connected together by a first duct (31) opening to the upper part of the first chamber (10) in such a way as to allow liquid or gas to be transferred into the second chamber following the expansion of the liquid in the circuit, and a first pressure limiting valve (36) able to open to allow the liquid or the gas to escape from the second chamber when its pressure therein reaches a first determined value, the first and second chambers and the first duct being defined by the same rigid casing (1), the first duct running along the exterior wall (2, 3) of the casing and the first valve being secured thereto, characterized in that the casing defines a third chamber (12) and at least one second duct (32, 33) connecting the second and third chambers (11, 12) via the first valve (36) and carries a second pressure limiting valve (44) able to open to allow the gas to escape from the third chamber when its pressure therein reaches a second determined value higher than the first determined value.
  2. Device according to Claim 1, characterized in that the first duct is formed within a thickened portion (15) of the exterior wall of the casing.
  3. Device according to Claim 2, characterized in that the casing is formed of at least two hollow moulded parts (6, 7) assembled edge to edge in sealed fashion, particularly by bonding or welding, a groove (20) being formed along the edge (8) to be assembled of at least a first of the said parts so as to form the first duct.
  4. Device according to one of the preceding claims, characterized in that the casing defines second and third ducts (32, 33) respectively connecting the second and third chambers to the first valve, and a fourth duct (42) connecting the third chamber to the second valve, all these being formed within thickened portions of the exterior wall of the casing.
  5. Device according to Claim 4, characterized in that the casing has a horizontally elongate shape, with a substantially uniform cross section, the three chambers being aligned between a first end (3) and the second end (4) of the casing and separated from one another by two transverse partitions (13, 14).
  6. Device according to Claim 5, characterized in that the casing comprises two parts (6, 7) which are joined together along a longitudinal joining plane (P1), the four ducts running along the joining plane.
  7. Device according to Claim 6, characterized in that the joining plane is essentially vertical and in that the first duct (31) runs, in the form of a groove (20) formed along the edge (8) of the said first part (6), from a region (21) of joining to the first chamber (10) situated on the upper side of the said edge as far as a region (23) of joining to the second chamber (11) situated on the lower side of the said edge, passing through the said first end (3), the third chamber (12) being adjacent to the said second end (4).
  8. Device according to Claim 7, characterized in that:
    the first and second valves (36, 44) are arranged externally on the second end (4) of the casing, on respective sides of the joining plane (P1);
    the first, second and third chambers (10 - 12) are aligned in that order between the first and second ends (3, 4) of the casing;
    the second and third ducts (32, 33) run respectively, in the form of a first groove (20) formed along the edge (8) of the said first part (6), from a region (22) of joining to the second chamber (11) situated on the upper side of the said edge as far as the said second end (4), and from the latter, under the second duct, as far as a region (24) of joining to the third chamber (12) situated on the lower side of the said edge, the said groove being interrupted by a bridge of material (29) obtained by moulding to separate the second and third ducts from each other at the second end, and connected to the inlet and to the outlet of the first valve, above and below the said bridge, by respective cavities (34, 35) formed in the wall of the casing;
    the fourth duct is formed by a second groove (42) formed in the edge (8) of the first part (6) to the second end (4) of the casing, juxtaposed towards the inside of the casing, with the region of the first groove (20) defining the second duct (32), communicating with the third chamber (12) at its upper end and closed at its lower end, the latter being connected to the inlet of the second valve (44) by a cavity (45) formed in the wall of the casing.
  9. Device according to Claim 8, characterized in that the first groove (20) runs substantially along the entire peripheral length of the edge (8) of the first part (6) to form the first, second and third ducts (31 - 33) and comprises, apart from the interruption (29) at the second edge separating the second and third ducts, at least one interruption (25, 26) on the upper side between the upstream ends (21, 22) of the first and second ducts (31, 32) and at least one interruption (27, 28) on the lower side between the downstream ends (23, 24) of the first and third ducts (31, 33).
EP97102247A 1996-02-20 1997-02-12 Multiple chamber expansion device for a cooling/heating circuit of a vehicle Expired - Lifetime EP0791733B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9602067A FR2745069B1 (en) 1996-02-20 1996-02-20 MULTI-CHAMBER EXPANSION DEVICE FOR VEHICLE COOLING / HEATING CIRCUIT
FR9602067 1996-02-20

Publications (2)

Publication Number Publication Date
EP0791733A1 EP0791733A1 (en) 1997-08-27
EP0791733B1 true EP0791733B1 (en) 2002-11-13

Family

ID=9489384

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97102247A Expired - Lifetime EP0791733B1 (en) 1996-02-20 1997-02-12 Multiple chamber expansion device for a cooling/heating circuit of a vehicle

Country Status (6)

Country Link
US (1) US5829268A (en)
EP (1) EP0791733B1 (en)
KR (1) KR970062274A (en)
BR (1) BR9701014A (en)
DE (1) DE69716980T2 (en)
FR (1) FR2745069B1 (en)

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Also Published As

Publication number Publication date
FR2745069B1 (en) 1998-04-10
EP0791733A1 (en) 1997-08-27
DE69716980D1 (en) 2002-12-19
US5829268A (en) 1998-11-03
KR970062274A (en) 1997-09-12
DE69716980T2 (en) 2003-07-17
FR2745069A1 (en) 1997-08-22
BR9701014A (en) 1998-11-03

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