EP0902184B1 - Method for manufacturing an intake muffler, particularly for compression circuits for refrigeration systems and the like - Google Patents

Method for manufacturing an intake muffler, particularly for compression circuits for refrigeration systems and the like Download PDF

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Publication number
EP0902184B1
EP0902184B1 EP19980115986 EP98115986A EP0902184B1 EP 0902184 B1 EP0902184 B1 EP 0902184B1 EP 19980115986 EP19980115986 EP 19980115986 EP 98115986 A EP98115986 A EP 98115986A EP 0902184 B1 EP0902184 B1 EP 0902184B1
Authority
EP
European Patent Office
Prior art keywords
base
cover
muffler
intake
manufacturing
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
EP19980115986
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0902184A2 (en
EP0902184A3 (en
Inventor
Lanfranco Cavicchioli
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.)
Clam SpA
Original Assignee
Clam SpA
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 Clam SpA filed Critical Clam SpA
Publication of EP0902184A2 publication Critical patent/EP0902184A2/en
Publication of EP0902184A3 publication Critical patent/EP0902184A3/en
Application granted granted Critical
Publication of EP0902184B1 publication Critical patent/EP0902184B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/0027—Pulsation and noise damping means
    • F04B39/0055—Pulsation and noise damping means with a special shape of fluid passage, e.g. bends, throttles, diameter changes, pipes
    • F04B39/0072—Pulsation and noise damping means with a special shape of fluid passage, e.g. bends, throttles, diameter changes, pipes characterised by assembly or mounting

Definitions

  • the present invention relates to a method for manufacturing an intake muffler, particularly for compression circuits for refrigeration systems and the like.
  • an air intake device which acts as silencer and as cooling system, is used for each compressor in compression circuits.
  • This device better known as intake muffler, consists of two parts: a base, in which a labyrinth-like path is molded, and a cover; said parts are assembled in order to obtain a hermetic casing.
  • the muffler since the intake is transmitted to capillary ducts, the muffler must be provided so that in addition to ensuring perfect tightness it has no flash which, as a consequence of its separation, might start circulating and obstruct said capillary passages.
  • Intake mufflers are currently manufactured in two parts which are joined by ultrasonic welding. Although this type of welding occurs in controlled conditions as regards the profile of the two parts to be coupled, the shape of the sonotrode and the frequency and intensity of the welding action, nonetheless some of the welded parts have flash along their inside and outside perimeters.
  • Another conventional solution for mutually assembling the cover and the base of the muffler provides for the mutual interlocking of the two parts by means of teeth formed in the plastic; in this manner the muffler is not pressure-tight.
  • Another conventional solution provides for the insertion, between the base and the cover, of a third element made of rubber-like material which, when compressed, provides at least some sort of pressure-tightness.
  • US-A-4 960 368 discloses a method for manufacturing intake mufflers as defined in the preamble of claim 1.
  • the aim of the present invention is to provide a method for manufacturing an intake muffler for compression circuits for refrigeration systems and the like which combines optimum tightness with substantially complete absence of flash.
  • an object of the present invention is to provide a method for manufacturing an intake muffler for compression circuits for refrigeration systems and the like in which internal flash is fully eliminated.
  • Another object of the present invention is to provide a method for manufacturing an intake muffler for compression circuits for refrigeration systems and the like in which the construction method according to the invention is provided by modifying molds that are currently used.
  • Another object of the present invention is to provide a method for manufacturing an intake muffler for compression circuits for refrigeration systems and the like which is highly reliable, relatively easy to manufacture and at low costs.
  • the method for manufacturing the intake muffler according to the present invention comprises a first step which consists in molding the base 1 and the cover 2 of the muffler in separate molds, thus obtaining the finished parts meant to be assembled in order to constitute the intake muffler, generally designated by the reference numeral 100 in Figure 3.
  • the step for the assembly of the muffler is performed in a suitable assembly mold, in which a perimetric profile is formed, being adapted to provide a retention joint 3 which is molded perimetrically at the coupling edge of the base 1 and of the cover 2.
  • the retention joint 3 thus closes the perimeter of the base and of the cover of the muffler; in order to provide a hermetic coupling on the upper surface of the cover 2, at the edge, and on the lower surface of the base, at the rim, perimetric grooves 4 are provided in which complementarily shaped raised portions 5 engage.
  • the raised portions are formed on the retention joint 3 as a consequence of molding in the mold for the assembly of the muffler 100.
  • the retention joint therefore has, in a transverse sectional view, a substantially C-shaped profile as shown in Figure 3.
  • the coupling between the base 1 and the cover 2 occurs by means of the interlocking of a frustum-shaped protrusion 6 of the cover 2 in a cavity 7 formed in the base 1.
  • the frustum-like shape of the cavity 7 and of the protrusion 6 allows to obtain an interlock between the base 1 and the cover 2 which combines with the action of the retention joint 3, engaging between the rim of the cover 2 and the rim of the base 1, as described above.
  • the molding of the retention joint 3 around the seam for coupling the base and the cover eliminates the possibility of forming internal flash and any external flash that might form at the closure regions of the mold can be easily eliminated.
  • the compactness of the muffler can be increased by using additional systems for mutually anchoring the retention joint 3 and the base 1 of the muffler.
  • undercuts 8 formed as grooves provided in the outer rim of the base 1 of the muffler.
  • the method according to the invention fully achieves the intended aim, since it allows to perform the hermetic assembly of an intake muffler while avoiding the forming of internal and external perimetric flash, which can be damaging, if it breaks off, by obstructing capillary passages in which the cooling air aspirated by the compressor through said muffler must pass.
  • the base 1 and the cover 2 of the muffler can be provided, at one or more outer rim regions, with an undercut which is more definite than the undercuts 4 (perimetric grooves) shown in Figure 3, to anchor the retention jont 3.
  • the outer rim profile is suitably interrupted at one or more regions, to define at least one indentation 10. Accordingly, the retention joint 3 is molded perimetrically and the indentation 10 fills with molded material when the base and the cover are assembled, in order to strenghten the coupling.
  • the materials employed may be any according to requirements and to the state of the art.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Compressor (AREA)
  • Exhaust Silencers (AREA)
  • Transmission Systems Not Characterized By The Medium Used For Transmission (AREA)
  • Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
EP19980115986 1997-09-11 1998-08-25 Method for manufacturing an intake muffler, particularly for compression circuits for refrigeration systems and the like Expired - Lifetime EP0902184B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI972073 1997-09-11
ITMI972073 IT1295020B1 (it) 1997-09-11 1997-09-11 Procedimento di realizzazione di muffola di aspirazione, particolarmente per circuiti di compressione per impianti frigoriferi

Publications (3)

Publication Number Publication Date
EP0902184A2 EP0902184A2 (en) 1999-03-17
EP0902184A3 EP0902184A3 (en) 2000-03-22
EP0902184B1 true EP0902184B1 (en) 2005-04-20

Family

ID=11377859

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19980115986 Expired - Lifetime EP0902184B1 (en) 1997-09-11 1998-08-25 Method for manufacturing an intake muffler, particularly for compression circuits for refrigeration systems and the like

Country Status (4)

Country Link
EP (1) EP0902184B1 (es)
DE (1) DE69829810T2 (es)
ES (1) ES2242252T3 (es)
IT (1) IT1295020B1 (es)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000297754A (ja) * 1999-04-15 2000-10-24 Matsushita Refrig Co Ltd 密閉型電動圧縮機
JP2000337254A (ja) * 1999-05-27 2000-12-05 Matsushita Refrig Co Ltd 密閉型電動圧縮機
JP3738729B2 (ja) * 2001-11-28 2006-01-25 オムロンヘルスケア株式会社 血圧計の音響フィルタ
BR0300905B1 (pt) 2003-03-28 2011-06-28 sistema de fechamento de filtro de sucção para compressor hermético.

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1005684A (fr) * 1947-09-05 1952-04-15 Roulements A Aiguilles Sa Procédé d'assemblage d'éléments métalliques et assemblages résultant de l'application de ce procédé
JPS5943917A (ja) * 1982-09-02 1984-03-12 Sanyo Electric Co Ltd 圧縮機の吸込マフラ製造方法
DE3312231A1 (de) * 1983-04-05 1984-10-11 Bayer Ag, 5090 Leverkusen Hohlkoerper aus kunststoffen
BR8804016A (pt) * 1988-07-29 1990-03-20 Brasil Compressores Sa Aperfeicoamento em sistema de succao para compressor hermetico de refrigeracao
FR2690376B1 (fr) * 1992-04-22 1995-08-11 Aplast Consortium Procede pour fabriquer un corps creux en matiere plastique par assemblage de deux demi-coquilles, et corps creux ainsi obtenu, notamment collecteur d'amission d'air de moteur a explosion.
US5341654A (en) * 1993-04-16 1994-08-30 Copeland Corporation Suction gas conduit

Also Published As

Publication number Publication date
EP0902184A2 (en) 1999-03-17
ES2242252T3 (es) 2005-11-01
DE69829810D1 (de) 2005-05-25
IT1295020B1 (it) 1999-04-27
ITMI972073A1 (it) 1999-03-11
EP0902184A3 (en) 2000-03-22
DE69829810T2 (de) 2006-03-02

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