US3904321A - Feedback pressure responsive control valve for a rotary piston compressor - Google Patents

Feedback pressure responsive control valve for a rotary piston compressor Download PDF

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Publication number
US3904321A
US3904321A US455465A US45546574A US3904321A US 3904321 A US3904321 A US 3904321A US 455465 A US455465 A US 455465A US 45546574 A US45546574 A US 45546574A US 3904321 A US3904321 A US 3904321A
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US
United States
Prior art keywords
piston
control piston
retaining
spring
rotary
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
US455465A
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English (en)
Inventor
Joseph Ruedi
Oskar Vielmo
Franz Weinhandl
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.)
Nova Werke AG
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Nova Werke AG
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 Nova Werke AG filed Critical Nova Werke AG
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Publication of US3904321A publication Critical patent/US3904321A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F04C29/12—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet
    • F04C29/124—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet with inlet and outlet valves specially adapted for rotary or oscillating piston pumps
    • F04C29/126—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet with inlet and outlet valves specially adapted for rotary or oscillating piston pumps of the non-return type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
    • F04C28/06—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids specially adapted for stopping, starting, idling or no-load operation

Definitions

  • the present invention relates to a rotary piston compressor comprising a piston located eccentric-ally with respect to its drive shaft and a stop slide pressed against the piston by at least one spring.
  • Rotary piston compressors of this type are known. They may be used. for example. for producing com pressed air for compressed air brakes of vehicles. for example. heavy motor vehicles. When employed in this way. they are driven continuously by the motor of the vehicle and are designed to supply a compressed air brake cylinder with compressed air. The compressed air feed must be discontinued when there is a predetermined maximum pressure in the compressed air brake cylinder and it should be recommcnced when the coinpressed air in the cylinder falls below a lower threshold value. The process of switching into the idling state or of recommencing the compressed air supply is controlled by a special pressure regulator which. for CXIHTF le. opens and closes an auxiliary outlet valve.
  • the object of the present invention is to provide a simplified pressure regulator for a rotary piston compressor of the type mentioned initially.
  • the present invention consists in that the stop slide is adapted to be held in its top compression point by a retaining piston which is adapted to be moved into its retaining position against the force of a first spring by a control piston acted on by feed pressure.
  • the retaining piston is advantageously connected to the control piston via a second spring.
  • control piston may adiantagcously be provided with a bistable lock ing mechanism with spring action.
  • the retaining action on the stop slide thus begins suddenly and also ends suddenly when the feed pressure falls below a lower threshold value.
  • Rotary piston compressors are supplied with lubricatmg oil in a known manner.
  • the lubricant being supplied from a pressure line via a dosing device controlled by the compressor.
  • the control piston may simultaneously constitute a distributing slide valve servo piston for the lubricating oil feed.
  • the control piston may be provided with an annular groove which communi catcs with the lubricating oil feed line when the piston is in a position in which the stop slide is released.
  • the rotary piston compressor shown in the drawing tiU comprises a housing 1 in which is located a shaft 2 with an eccentric central part 3. An eccentric ball race 4 is mounted for rotation on the eccentric part 3. A rotary piston 5, the skirt surface of which touches the inner wall of the housing 1 along a line is mounted for rotation on the bearing ring 4.
  • the friction surface between the bearing ring 4 and the rotary piston 5 is represented as a friction bearing 6.
  • a roller bearing could also be provided.
  • the generating space 7 of the compressor is divided by a stop slide 8 which is pressed against the rotary piston 5 by a spring 9 via a bolt 10.
  • the air is sucked in through the inlet E on the one side of the stop slide 8 and enters the chamber 7 through an inlet port 7a adjacent the stop slide 8. It is then forced through a recess 11 on the other side of the stop slide 8 via a pressure valve 12 into the outlet A.
  • a housing 13 which contains an axially displaccable control piston 1-1 is also secured to the suction side of the housing.
  • This control piston 14 comprises an extension having threading l5 and a ram 16 with a bore hole 161:.
  • a retaining piston 17 is displaceably mounted in a stator bore in the axial extension of the ram [6.
  • the front side of the retaining piston I7 is directed towards the stop slide 8.
  • the piston 17 comprises a rod 17a bearing a spiral spring 18.
  • the spring 18 is checked by an annular disc 19 and a spring washer 20.
  • the annular front side of the ram 16 abuts against the annular disc 19.
  • a lock nut 21 is provided on the threading 15.
  • a prcstrcssed spiral spring 22 is arranged between the lock nut 21 and the housing 1.
  • the space 23 in front of the control piston 14 is connected to the outlet side A via a line 24.
  • the housing 13 On its inner side. the housing 13 is pro ⁇ ided with an outwardly extending inclined portion 25.
  • Two bearings 26 stressed by a spring 27 are arranged in a cross bore of the control piston [4. When the piston I4 is in the position represented. the bearings 26 engage in an annular groove 30 in the housing 13.
  • the control piston 14 also comprises an annular groove 28 which is in communication with a lubricating oil line 29 when the control piston is in the position shown in the drawing.
  • the mode of operation of the rotary piston compressor is the following:
  • the outlet A is connected. for example.
  • the prcstrcssing of the spring 22 can be altered by turning the adjusting nut 21. In this way it is possible to adjust the value of the air pressure at which the control piston 14 responds.
  • a rotary piston compressor having a piston located eccentrically with respect to its drive shaft and a stop slide pressed by at least one spring against the piston
  • the improvement comprising: a housing, a retaining piston adapted to hold said stop slide in its top compression point, a control piston in said housing adapted to actuate said retaining piston into its retaining position, a first spring urging said control piston away from said retaining piston and. a source of feed pressure to move said control piston against the force of said first spring whereby said retaining piston is moved into its retaining position.
  • a rotary compressor according to claim 1 wherein a second spring connects the retaining piston (17) to the control piston (14).
  • a rotary piston compressor according to claim 2 wherein a bistable locking mechanism locks the control piston (14) by spring action (26, 27).
  • a rotary piston compressor according to claim 3, wherein said bistable locking mechanism comprises. a plurality of bearings (26), said bearings stressed by a spring (27) and arranged in the control piston (14), said bearings (26) arranged for engagement in recesses in said housing (25, 30) at two end positions of the control piston (14).
  • control piston 14 further is a distributing slide valve servo piston for a lubricating oil feed.
  • control piston (14) comprises an annular groove (28) in communication with a lubricating oil supply line (29) when the control piston (14) is in the position in which the stop slide (8) is released.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Compressor (AREA)
  • Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
US455465A 1973-03-29 1974-03-27 Feedback pressure responsive control valve for a rotary piston compressor Expired - Lifetime US3904321A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH454173A CH567188A5 (enrdf_load_html_response) 1973-03-29 1973-03-29

Publications (1)

Publication Number Publication Date
US3904321A true US3904321A (en) 1975-09-09

Family

ID=4278008

Family Applications (1)

Application Number Title Priority Date Filing Date
US455465A Expired - Lifetime US3904321A (en) 1973-03-29 1974-03-27 Feedback pressure responsive control valve for a rotary piston compressor

Country Status (5)

Country Link
US (1) US3904321A (enrdf_load_html_response)
JP (1) JPS49129216A (enrdf_load_html_response)
CH (1) CH567188A5 (enrdf_load_html_response)
DE (1) DE2409270A1 (enrdf_load_html_response)
GB (1) GB1448625A (enrdf_load_html_response)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2470267A1 (fr) * 1979-11-21 1981-05-29 Bitzer Kuehlmaschinenbau Kg Compresseur a piston roulant
US4861246A (en) * 1988-01-07 1989-08-29 Bernard Zimmern Injected compressor with liquid switch
US5545021A (en) * 1993-12-21 1996-08-13 Matsushita Electric Industrial Co., Ltd. Hermetically sealed rotary compressor having an oil supply capillary passage
US5564917A (en) * 1993-04-27 1996-10-15 Carrier Corporation Rotary compressor with oil injection
US5871342A (en) * 1997-06-09 1999-02-16 Ford Motor Company Variable capacity rolling piston compressor
US6095783A (en) * 1998-02-20 2000-08-01 Hansen; Craig N. Fluid mover
US20050129551A1 (en) * 2003-12-16 2005-06-16 Samsung Electronics Co., Ltd. Variable capacity rotary compressor
US20070071628A1 (en) * 2005-09-29 2007-03-29 Tecumseh Products Company Compressor
CN103244412A (zh) * 2012-02-06 2013-08-14 珠海格力节能环保制冷技术研究中心有限公司 双转子变容压缩机

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0250665B1 (en) * 1986-06-30 1990-12-27 Matsushita Refrigeration Company A rotary compressor

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1922639A (en) * 1931-03-13 1933-08-15 Worthington Pump & Mach Corp Unloading mechanism for rotary compressors
US3107846A (en) * 1961-10-10 1963-10-22 Aim Pump Corp Rotary pump or motor

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1922639A (en) * 1931-03-13 1933-08-15 Worthington Pump & Mach Corp Unloading mechanism for rotary compressors
US3107846A (en) * 1961-10-10 1963-10-22 Aim Pump Corp Rotary pump or motor

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2470267A1 (fr) * 1979-11-21 1981-05-29 Bitzer Kuehlmaschinenbau Kg Compresseur a piston roulant
US4397618A (en) * 1979-11-21 1983-08-09 Bitzer-Kuhlmaschinenbau Gmbh & Co. Kg Rolling piston compressor with locking device for the separating slide
US4861246A (en) * 1988-01-07 1989-08-29 Bernard Zimmern Injected compressor with liquid switch
US5564917A (en) * 1993-04-27 1996-10-15 Carrier Corporation Rotary compressor with oil injection
US5545021A (en) * 1993-12-21 1996-08-13 Matsushita Electric Industrial Co., Ltd. Hermetically sealed rotary compressor having an oil supply capillary passage
US5685703A (en) * 1993-12-21 1997-11-11 Matsushita Electric Industrial Co., Ltd. Hermetically sealed rotary compressor having an oil supply passage to the compression compartment
US5871342A (en) * 1997-06-09 1999-02-16 Ford Motor Company Variable capacity rolling piston compressor
US6095783A (en) * 1998-02-20 2000-08-01 Hansen; Craig N. Fluid mover
US20050129551A1 (en) * 2003-12-16 2005-06-16 Samsung Electronics Co., Ltd. Variable capacity rotary compressor
US7150608B2 (en) * 2003-12-16 2006-12-19 Samsung Electronics Co., Ltd. Variable capacity rotary compressor
US20070071628A1 (en) * 2005-09-29 2007-03-29 Tecumseh Products Company Compressor
CN103244412A (zh) * 2012-02-06 2013-08-14 珠海格力节能环保制冷技术研究中心有限公司 双转子变容压缩机
CN103244412B (zh) * 2012-02-06 2015-10-28 珠海格力节能环保制冷技术研究中心有限公司 双转子变容压缩机

Also Published As

Publication number Publication date
CH567188A5 (enrdf_load_html_response) 1975-09-30
JPS49129216A (enrdf_load_html_response) 1974-12-11
GB1448625A (en) 1976-09-08
DE2409270A1 (de) 1974-10-17

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