EP0905377B1 - Entrée d'aspiration moulée - Google Patents

Entrée d'aspiration moulée Download PDF

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Publication number
EP0905377B1
EP0905377B1 EP98307618A EP98307618A EP0905377B1 EP 0905377 B1 EP0905377 B1 EP 0905377B1 EP 98307618 A EP98307618 A EP 98307618A EP 98307618 A EP98307618 A EP 98307618A EP 0905377 B1 EP0905377 B1 EP 0905377B1
Authority
EP
European Patent Office
Prior art keywords
suction
chamber
cylinder block
casted
suction chamber
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
EP98307618A
Other languages
German (de)
English (en)
Other versions
EP0905377A3 (fr
EP0905377A2 (fr
Inventor
Eng Hwa Goay
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.)
Panasonic Refrigeration Devices Singapore Pte Ltd
Original Assignee
Matsushita Refrigeration Industries S Pte Ltd
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 Matsushita Refrigeration Industries S Pte Ltd filed Critical Matsushita Refrigeration Industries S Pte Ltd
Publication of EP0905377A2 publication Critical patent/EP0905377A2/fr
Publication of EP0905377A3 publication Critical patent/EP0905377A3/fr
Application granted granted Critical
Publication of EP0905377B1 publication Critical patent/EP0905377B1/fr
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
    • F04B39/12—Casings; Cylinders; Cylinder heads; Fluid connections
    • F04B39/123—Fluid connections
    • 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
    • F04B39/0061—Pulsation and noise damping means with a special shape of fluid passage, e.g. bends, throttles, diameter changes, pipes using muffler volumes

Definitions

  • the present invention relates to a suction chamber of the cylinder block of a reciprocating type hermetic compressor.
  • it relates to the integration of the suction tube with the suction chamber to form a muffling suction chamber.
  • Reciprocating-type hermetic compressors are well known in the art.
  • an electric motor drive is built into a sealed housing or shell, and has a stator or electric armature affixed therein, and a rotor assembly assembled into the cylindrical passage of the stator.
  • An integral cast iron cylinder block is built above the motor assembly having a compression chamber, suction chamber and the discharge chamber.
  • the rotor assembly includes a rotor and a crankshaft, with the crankshaft inserted into the cylindrical passage of the rotor by interference fit.
  • the reciprocating motion of the piston in the compression chamber compresses low pressure into high pressure gas.
  • the gas typically comprises freon or the like.
  • the low pressure gas enters the sealed shell from the system, and is sucked into the compression chamber via a suction tube inserted into the suction chamber.
  • a conventional bundy suction tube is inserted into an aperture in the suction chamber wherethrough the refrigerant gas, mixed with lubricating oil, is sucked.
  • the suction chamber is an empty chamber which reduces the level of noise produced by the flowing gas.
  • the suction tube has a narrower end which is inserted into the suction chamber, and a wider end which remains projecting outside the suction chamber.
  • a sufficiently long suction tube serves two purposes. The first purpose is the further attenuation of the noise caused by pulsation and resonance from the gas flow at the suction stroke of the piston.
  • the second purpose is to minimise the amount of oil sucked into the suction chamber together with refrigerant gas. The second purpose is generally achieved at the wider portion of the tube that remains projecting out from the suction chamber.
  • This projection is well know to act like a shelter to create a barrier against the dripping lubricant oil that has been sprayed upwards due to the spinning movement of the crankshaft.
  • an inlet tube constitutes an additional purchased part, which increases the overall cost of production. As a result, it is desirable that this extra cost be lowered without compromising the noise control and oil sheltering function of this part.
  • US 4,115,035 discloses a refrigeration type motor compressor having a cast, suction sound damping chamber with an integrated gas inlet hole.
  • a cylinder block of a reciprocating-type hermetic compressor comprising a compression chamber, a suction chamber, a discharge chamber and a cost suction inlet, characterised in that the suction inlet is a tubular cast suction passage projecting into the interior of the suction chamber. This projection is long enough to prevent suction resonance due to the pulsating sounds given off when the piston draws the refrigerant gas.
  • the cylinder block embodying the cast suction passage overcomes the drawback of the suction chamber provided in the prior art while allowing the compressor capacity and efficiency to be maintained at the level of the prior art compressors.
  • a typical reciprocating compressor in the prior art includes a sealed housing or shell (22), wherein an electric motor (24), the crankshaft (26) and the cylinder block (28) are housed.
  • the bold arrows indicate the path from which the refrigerant gas enters the housing and into the compression chamber (30) via the suction chamber (34), before being discharged into the discharge chamber (32).
  • FIG. 2 shows in greater detail the cylinder block as typically found in the prior art.
  • the cylinder block includes a compression chamber 30, a discharge chamber 32 and a suction chamber 34.
  • the compression chamber is connected to the discharge and suction chambers through channels in the cast iron which are controlled by reed valves. These channels are shown in dotted lines in Figure 2.
  • a bore 35 in the suction chamber 34 is provided to allow the insertion of the suction tube 37.
  • the suction tube has a narrower inner section 36 and a wider outer section 38. The direction of the insertion is shown by the arrow.
  • Figure 3 shows the suction chamber with the suction tube inserted as typically done in the prior art.
  • the inner section 36 projects into the suction chamber, the length thereof being sufficiently long to effectively reduce the pulsating resonance of the suction stroke.
  • the outer section 38 of the suction tube extends outwards from the suction chamber into the interior of the housing. The prior art teaches that this projection is necessary to alleviate the oil intake by the suction chamber as refrigerant gas is sucked in.
  • Figure 4 shows the one embodiment of the cylinder block in the present invention.
  • the present invention called the muffling suction chamber, includes a tabular casted suction inlet 40 extending into the interior of the suction chamber.
  • the tubular casted suction passage effectively replaces the suction tube in the prior art, eliminating the need for this additional part.
  • the tubular passage is shown as dotted lines in Figure 4.
  • the embodiment of the invention as shown in Figure 4 does not include an outer section, as in the prior art.
  • the front of the compression chamber 30 is a square head that is vertically milled after casting to allow the reed valves to be installed, and no outer projection is casted beyond a position as delineated by line 42-42.
  • This outer projection has been widely accepted as being necessary for the alleviation of oil intake at the suction chamber. Contrary to conventional teaching, though, it has been found that the present casted suction inlet with the truncated outer section still maintains the same level of noise control without causing any increase in oil intake.
  • the front of the compressor chamber is a head that has to be vertically milled after casting to allow the reed valves to be installed.
  • honing has to be performed on the compression chamber.
  • no projecting part can be casted beyond the section head.
  • an outer projection of the casted suction inlet cannot be casted.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Compressor (AREA)
  • Compressors, Vaccum Pumps And Other Relevant Systems (AREA)

Claims (3)

  1. Bloc cylindre (28) du type compresseur hermétique à piston, comprenant une chambre de compression (30), une chambre d'aspiration (34), une chambre d'évacuation (32), et une entrée (40) d'aspiration moulée, caractérisé en ce que l'entrée (40) d'aspiration est un passage d'aspiration moulé tubulaire, s'étendant vers l'intérieur de la chambre (34) d'aspiration.
  2. Bloc cylindre (28) selon la revendication 1, caractérisé en ce que ledit passage d'aspiration moulé tubulaire présente une longueur d'au moins 20 millimètres.
  3. Bloc cylindre (28) selon la revendication 1 ou 2, caractérisé en ce que ladite entrée d'aspiration comporte une section interne dirigée vers l'intérieur de la chambre d'aspiration, et une section extérieure tronquée dirigée vers l'extérieur de la chambre d'aspiration.
EP98307618A 1997-09-24 1998-09-18 Entrée d'aspiration moulée Expired - Lifetime EP0905377B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SG1997003545A SG76529A1 (en) 1997-09-24 1997-09-24 Casted suction inlet
SG9703545 1997-09-24

Publications (3)

Publication Number Publication Date
EP0905377A2 EP0905377A2 (fr) 1999-03-31
EP0905377A3 EP0905377A3 (fr) 1999-10-06
EP0905377B1 true EP0905377B1 (fr) 2004-02-25

Family

ID=20429740

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98307618A Expired - Lifetime EP0905377B1 (fr) 1997-09-24 1998-09-18 Entrée d'aspiration moulée

Country Status (5)

Country Link
EP (1) EP0905377B1 (fr)
CN (1) CN1118670C (fr)
AU (1) AU711534B2 (fr)
DE (1) DE69821849T2 (fr)
SG (1) SG76529A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100310439B1 (ko) * 1999-12-08 2001-09-28 이충전 왕복동식 밀폐형 압축기

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1152218B (de) * 1961-04-25 1963-08-01 Danfoss Ved Ing M Clausen Verdichter, insbesondere fuer hermetisch gekapselte Kleinkaeltemaschinen
DE1403460A1 (de) * 1967-10-31 1968-11-21 Danfoss As Gegossenes Bauteil fuer Verdichter
DE2617370B2 (de) * 1976-04-21 1978-03-02 Danfoss A/S, Nordborg (Daenemark) Durch einen Elektromotor angetriebener Motorverdichter
IT1130814B (it) * 1980-07-31 1986-06-18 Indesit Gruppo motocompressore specialmente per compressori ermetici di macchine pneumofore o frigorifere
JPS6022197B2 (ja) * 1982-11-30 1985-05-31 シャープ株式会社 密閉型電動圧縮機の吸入管取付方法
US4784581A (en) * 1987-01-12 1988-11-15 White Consolidated Industries, Inc. Compressor head and suction muffler for hermetic compressor
JPS6440232A (en) * 1987-08-07 1989-02-10 Canon Kk Article feeding device

Also Published As

Publication number Publication date
DE69821849D1 (de) 2004-04-01
SG76529A1 (en) 2000-11-21
EP0905377A3 (fr) 1999-10-06
AU8607298A (en) 1999-04-15
CN1118670C (zh) 2003-08-20
CN1215142A (zh) 1999-04-28
DE69821849T2 (de) 2005-01-20
EP0905377A2 (fr) 1999-03-31
AU711534B2 (en) 1999-10-14

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