US3766833A - Pressostat - Google Patents

Pressostat Download PDF

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Publication number
US3766833A
US3766833A US00268608A US3766833DA US3766833A US 3766833 A US3766833 A US 3766833A US 00268608 A US00268608 A US 00268608A US 3766833D A US3766833D A US 3766833DA US 3766833 A US3766833 A US 3766833A
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US
United States
Prior art keywords
bellows
control member
pressostat
chamber
pressure face
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
US00268608A
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English (en)
Inventor
A Kraemer
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.)
Danfoss AS
Original Assignee
Danfoss AS
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 Danfoss AS filed Critical Danfoss AS
Application granted granted Critical
Publication of US3766833A publication Critical patent/US3766833A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H35/00—Switches operated by change of a physical condition
    • H01H35/24—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow
    • H01H35/26—Details
    • H01H35/2671—Means to detect leaks in the pressure sensitive element

Definitions

  • the invention is a pressostat assembly which includes two bellows, one inside the other, which have fluid communication. Both bellows are fixedly attached to a rod form of operating member and the outer bellows operates to impart a closing movement to the operating member if the inner bellows should develop a leak.
  • the effective cross sectional area of the outer bellows is larger than that of the inner bellows.
  • the rod form of operation member is provided with a passage for filling or evacuating a protective chamber surrounded by the protective bellows.
  • the invention relates to a pressostat assembly comprising an actuating element for operating a switch.
  • the assembly includes inner and outer bellows operatively connected to said actuating element, a spring counteracting the pressure in the actuating element, and a switching element which responds when a limit valve for pressure is exceeded in the actuating element.
  • the actuating element is also referred to herein as a working element.
  • the outer bellows has a protective function and the inner bellows is the operating bellows for normal operation.
  • the operating bellows is acommodated in an enclosed protective chamber, part of the outer wall of which is formed by the protective bellows which likewise counteracts the spring and which actuates the switching element when a limit value for pressure in the protective chamber, that is lower than the limit value for pressure in the working element, is exceeded.
  • the protective bellows surrounds the operating bellows and has a larger effective pressure face than the latter and is connected to the outlet control member of the working element. The outlet control member only need bear against the operating bellows in a mechanically positivemanner.
  • a pressostat of this kind actuates the switching element not only during the normal course of operations, but also very soon after the occurrence of damage to the pressostat, particularly if the operating bellows develops a leak. If the pressure in the enclosed protective chamber is below that of the surrounding atmosphere, the additional bellows is also monitored. Thus a selfmonitoring pressostat of very simple construction is provided.
  • the construction of a pressostat of this kind is provided with a closed passage in the outlet control member of the working element for the purpose of filling or evacuating the protective chamber surrounded by the protective bellows.
  • the outlet control member Since the outlet control member has to be machined in any case, no difficulty is presented in also providing it with the filling or' evacuating passage.
  • the mouth of the passage which as to be closed after filling or evacuation is located in a readily accessible position.
  • a very simple construction is obtained if the passage is formed by an axial bore leading to the free end-face of the outlet control member, and by a transverse bore. These two passages can be formed without great expense when machining the outlet control member.
  • a copper tube is soldered into the axial bore, and after the protective chamber has been filled or evacuated, this tube is closed by soldering.
  • a very short length of copper tube suffices. Closing is facilitated by the double soldering.
  • the outlet control member may have a flange that is located near the outer face of the additional bellows, and a cover cap forming a bearing can be mounted on this flange. The soldered point, forming a seal for the copper tube, is thus additionally protected.
  • An insert 3 forming part of a pressostat 4 is introduced by means of a port 5 into a wall 1 of a container 2 of equipment through which refrigerant passes, and the insert is held in position by means of a nut 6.
  • the port contains a connecting bore 7 which leads to the working element 8.
  • This element is bounded by an outer wall 9 of the insert 3, a tubular bellows 10 having a pressure face 11, the inner end-face 12 of the insert 3, and a ring 13 which is connected to the operating bellows l0 and is secured to the wall 9 by soft soldering.
  • An outlet control member 14 in the form of a spindle acts on the lever 15 which pivots about a pin 16.
  • the lever is biased by a rated-value spring 17 which is held by a preferably adjustable backing element 18.
  • the free end of the lever 15 actuates a switching element 19 which in the present case is the plunger 20 of a micro-switch.
  • the working element 8 is surrounded by a protective chamber 21 which is bounded by an additional bellows 22 having a pressure face 23, the side wall 9 of the insert 3 and a flange 24 of the insert 3, which flange is silver-soldered to said insert.
  • the additional bellows 22 is soft-soldered to the flange 24 at 25, and is silversoldered to the outlet control member 14 at 26.
  • the size of the pressure face 23 is a multiple of that of the pressure face 11.
  • the outlet control member 14 has a passage 27 which consists of a bore 28, coaxial with said member, and of a transverse bore 29.
  • a copper pipe 30 is secured in the free end of the passage 27 at 31 by softsoldering. After the protective chamber 21 has been filled or evacuated, the mouth of the copper tube 30 is squeezed up at 32 and sealed by soft-soldering.
  • the control member 14 has a flange 33 which lies on the pressure face 23 of the additional bellows 22. Mounted on this flange is a cover cap 34 which terminates in a point forming a bearing 35 for the lever 15; the soldered point 32 is protected within this cap.
  • the pressostat 4 operates in the following manner. When the pressure in the container 2 of the equipment rises, this pressure also acts upon the working element 8. If this pressure exceeds a predetermined level, which is above the normal operating values, the operating bellows l0 displaces the outlet control member 14, thereby overcoming the force of the spring 17. This causes the lever 15 to swing in the counter-clockwise direction, and the micro-switch 19 is actuated. This can be used for switching off the feed unit of the equipment, eg ,of a'refrigerating machine.
  • the pressostat is therefore not only a safety means which monitors excessive rises in pressure in the equipment, but it also prevents the unintentional discharge of the pressure medium from the equipment and rapidly switches off when a leak develops in the working element. Furthermore, those parts used for this additional function are so designed as to be self-monitoring.
  • a pressostat assembly comprising a housing having wall means which defines a chamber, said housing defining a port having fluid communication with said" thereof being fixedly attached relative to said housing to form'a fluid tight sub-chamber having direct fluid communication with said port, said second pressure face being smaller than said first pressure face, said control member having a passage for filing and evacuating said protective chamber.
  • a pressostat assembly according to claim 1 wherein said passage comprises an axial bore opening tothe outside of said control member and a connecting transverse bore having fluid communication with said protective chamber.
  • a pressostat assembly according to claim 2 including a copper. tube attached to said control member in fluid communication with said passage, said tube being sealed by soldering.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • Switches Operated By Changes In Physical Conditions (AREA)
  • Thermally Actuated Switches (AREA)
US00268608A 1971-07-03 1972-07-03 Pressostat Expired - Lifetime US3766833A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2133216A DE2133216C2 (de) 1971-07-03 1971-07-03 Pressostat

Publications (1)

Publication Number Publication Date
US3766833A true US3766833A (en) 1973-10-23

Family

ID=5812625

Family Applications (1)

Application Number Title Priority Date Filing Date
US00268608A Expired - Lifetime US3766833A (en) 1971-07-03 1972-07-03 Pressostat

Country Status (6)

Country Link
US (1) US3766833A (fr)
JP (1) JPS5126621B1 (fr)
DD (1) DD101224A6 (fr)
DE (1) DE2133216C2 (fr)
FR (1) FR2145219A5 (fr)
IT (1) IT1045234B (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6414254B1 (en) * 1999-10-15 2002-07-02 Chiaphua Industries Limited Electrical pressure sensing switch
WO2012018763A1 (fr) * 2010-08-03 2012-02-09 Halliburton Energy Services, Inc. Interrupteur de sécurité pour opérations en puits

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3824558A1 (de) * 1988-07-20 1990-02-01 Bosch Gmbh Robert Reifendrucksensor fuer kraftfahrzeuge
DE4014826A1 (de) * 1990-05-09 1991-11-14 Diehl Gmbh & Co Einrichtung zum ausloesen einer schaltfunktion bei einem bestimmten hydrostatischen druck
CN111048354B (zh) * 2019-12-06 2022-03-11 武汉航空仪表有限责任公司 一种迟滞可调的压力开关

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2312201A (en) * 1941-02-12 1943-02-23 Charles H Thompson Pressure transmitter
US2663155A (en) * 1949-10-04 1953-12-22 Safety Car Heating & Lighting Air conditioning system
US2718896A (en) * 1952-12-15 1955-09-27 Jones Barton Air transmitter
US2761927A (en) * 1953-09-21 1956-09-04 Raymond W Szypulski Barometric switch
US2988282A (en) * 1959-03-31 1961-06-13 Frederick W Hottenroth Fluid separating valve
US3055219A (en) * 1958-03-31 1962-09-25 Dewrance & Co Pressure gauges

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1523302B2 (de) * 1963-07-06 1970-02-26 Danfoss A/S, Nordborg (Dänemark) Thermostatisches Arbeitselement

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2312201A (en) * 1941-02-12 1943-02-23 Charles H Thompson Pressure transmitter
US2663155A (en) * 1949-10-04 1953-12-22 Safety Car Heating & Lighting Air conditioning system
US2718896A (en) * 1952-12-15 1955-09-27 Jones Barton Air transmitter
US2761927A (en) * 1953-09-21 1956-09-04 Raymond W Szypulski Barometric switch
US3055219A (en) * 1958-03-31 1962-09-25 Dewrance & Co Pressure gauges
US2988282A (en) * 1959-03-31 1961-06-13 Frederick W Hottenroth Fluid separating valve

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6414254B1 (en) * 1999-10-15 2002-07-02 Chiaphua Industries Limited Electrical pressure sensing switch
WO2012018763A1 (fr) * 2010-08-03 2012-02-09 Halliburton Energy Services, Inc. Interrupteur de sécurité pour opérations en puits
US20130118761A1 (en) * 2010-08-03 2013-05-16 Halliburton Energy Services, Inc. Safety Switch for Well Operations
AU2011285918B2 (en) * 2010-08-03 2014-08-14 Halliburton Energy Services, Inc. Safety switch for well operations
US9251982B2 (en) * 2010-08-03 2016-02-02 Halliburton Energy Services, Inc. Safety switch for well operations

Also Published As

Publication number Publication date
DE2133216C2 (de) 1983-08-25
DE2133216A1 (de) 1973-01-11
IT1045234B (it) 1980-05-10
JPS5126621B1 (fr) 1976-08-07
DD101224A6 (fr) 1973-10-20
FR2145219A5 (fr) 1973-02-16

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