US3383031A - Hermetic compressor pressure switch - Google Patents

Hermetic compressor pressure switch Download PDF

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Publication number
US3383031A
US3383031A US504328A US50432865A US3383031A US 3383031 A US3383031 A US 3383031A US 504328 A US504328 A US 504328A US 50432865 A US50432865 A US 50432865A US 3383031 A US3383031 A US 3383031A
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US
United States
Prior art keywords
compressor
discharge gas
pressure
gas pressure
electric motor
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
US504328A
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English (en)
Inventor
Charles B Ellis
Brown Sanford
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.)
Lennox Industries Inc
Original Assignee
Lennox Industries Inc
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 Lennox Industries Inc filed Critical Lennox Industries Inc
Priority to US504328A priority Critical patent/US3383031A/en
Priority to DE19661503445 priority patent/DE1503445A1/de
Priority to NL6608183A priority patent/NL6608183A/xx
Priority to DK315066AA priority patent/DK123548B/da
Priority to BE684355D priority patent/BE684355A/xx
Priority to GB36294/66A priority patent/GB1115598A/en
Application granted granted Critical
Publication of US3383031A publication Critical patent/US3383031A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B31/00—Compressor arrangements
    • F25B31/02—Compressor arrangements of motor-compressor units
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/005—Arrangement or mounting of control or safety devices of safety devices
    • 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
    • H01H35/34—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow actuated by diaphragm
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2500/00—Problems to be solved
    • F25B2500/07—Exceeding a certain pressure value in a refrigeration component or cycle
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S417/00—Pumps
    • Y10S417/902—Hermetically sealed motor pump unit

Definitions

  • HERMETIC COMPRESSOR PRESSURE SWITCH Filed Oct. 24, 1965 INVENTORS CHARLES B. ELLIS SANFOQD BROWN United States Patent Oflice 3,333,031 Patented May 14, 1968 3 383 031 HERMETIC coMrruzsson PRESSURE SWITCH Charles B. Ellis and Sanford Brown, Fort Worth, Tex., assignors to Lennox Industries Inc., a corporation of Iowa Filed Oct. 24, 1965, Ser. No. 504,328 1 Claim. (Cl.
  • This invention relates to a high-pressure motor control means for a hermetic refrigerant compressor and, more particularly, to a high-pressure control switch aflixed on a resiliently mounted cylinder block within a sealed housing, such control switch being in communication with the discharge gas muflling chamber formed in the cylinder block for sensing discharge gas pressure at its source.
  • Safety controls are provided on modern day hermetic refrigerant compressors to protect such compressors under all conditions of voltage, ambience and load without unnecessary shutdown due to false sensing of temperature or pressure conditions.
  • a control commonly utilized is a high-pressure safety cutout switch that is operative to cut off the power to the motor in case the condensing pressure or discharge gas pressure exceeds a predetermined limit.
  • the high-pressure switch has been mounted externally of the compressor.
  • a common highpressure switch comprises an electrical switch actuated by a pressure bellows connected through capillary-type tubing directly to the refrigerant discharge line. With such conventional pressure control, the capillary tube bleeding from the discharge line to the switch mechanism might break, permitting refrigerant to be lost to the atmosphere. Similarly, if the bellows within the pressure switch ruptured, refrigerant would be lost to the atmosphere.
  • Such constructions were further undesirable inasmuch as they were susceptible to tampering.
  • An object of the present invention is to provide a hermetic compressor with a high-pressure control switch that is carried on the cylinder block within the sealed outer housing and communicates with the discharge gas muflling chamber formed in the cylinder block for sensing discharge gas pressure at its source.
  • Another object of the present invention is to provide a high-pressure control switch means for a hermetic compressor which may be mounted integrally within the compressor so as to be free from tampering, such highpressure control switch means being constructed and arranged so as to prevent leakage of discharge gas to the suction side of the refrigeration system in the event there were leakage in the switch.
  • FIGURE 1 is a perspective view of a hermetic refrigerant compressor, with a portion of the casing being broken away to illustrate the location of the high-pressure control switch within the compressor;
  • FIGURE 2 is a fragmentary side view of the cylinder block, illustrating the location of the high-pressure control switch on the cylinder block;
  • FIGURE 3 is an enlarged cross-sectional view of the high-pressure control switch illustrating the connection of the switch to the upper flange on the cylinder block;
  • FIGURE 4 is a schematic wiring diagram of an electrical control system for a compressor motor employing the high-pressure control switch of the present invention.
  • FIGURE 1 there is illustrated a refrigerant compressor which comprises an outer casing enclosing both the compressor motor and the compression mechanism.
  • An upper shell 11 and a lower shell 12 are suitably joined together to form the hermetic outer casing.
  • the compressor 10 is adapted to be connected to a refrigerant circuit by means of a discharge gas fitting 13 and a suction gas fitting 14.
  • the compression mechanism 16 is resiliently supported within the outer casing by means of a plurality of spring means 18, which function between a flange 19 on the annular sleeve 29 defining a part of the compression mechanism and a coacting flange on a mounting ring 20 mounted on the interior of the outer casing.
  • spring means 18 which function between a flange 19 on the annular sleeve 29 defining a part of the compression mechanism and a coacting flange on a mounting ring 20 mounted on the interior of the outer casing.
  • the high-pressure control switch 22 of the present invention is disposed within the outer casing of compressor 10 and is integrally carried on the compression mechanism in communication with the discharge gas rnuilling chamber 24 defined therewithin.
  • the compression mechanism 16 includes a compressor block or body 26 having an upper peripheral flange 27 and a lower peripheral flange 28 defined thereon and an annular shield or sleeve 29, preferably made from metal, that cooperates with the annular flanges 27 and 28 on the compressor block to define the discharge gas muffling chamber 24 about the compressor block 26.
  • a compressor block or body 26 having an upper peripheral flange 27 and a lower peripheral flange 28 defined thereon and an annular shield or sleeve 29, preferably made from metal, that cooperates with the annular flanges 27 and 28 on the compressor block to define the discharge gas muffling chamber 24 about the compressor block 26.
  • Within the block 26 are reciprocating pistons which are operatively connected to a drive shaft or crankshaft driven by the compressor motor in usual fashion.
  • the high-pressure control switch 22 comprises a housing 30 having a reduced portion 32 that is externally threaded for engagement with a threaded opening 34 in the upper flange 27.
  • O-ring seal means 36 are provided about the reduced portion 32 between the body 30 and the flange to prevent the escape of discharge gas from within the discharge gas mufiling chamber 24.
  • the flexible bellows or diaphragm member 40 separates the chamber 38 from the chamber 42 within the body 30.
  • the member 40 may be fabricated from thin sheet metal or from a suitable plastic or composition material having the requisite strength and resistance to refrigerant and oil commonly used in refrigerant compressors.
  • the diaphragm 40 When the pressure within the chamber 38 exceeds the pressure within the chamber 42, the diaphragm 40 will be moved upwardly against the plunger 44, causing movement of plunger 44 upwardly to close a circuit between the contacts 46 and 48, which are connected to lead wires 50 and 52, respectively.
  • the plunger 44 may be biased away from the closed position by gravity or by the spring 54 shown schematically in FIGURE 3.
  • the spring 54 will bias the plunger downwardly to the position indicated in FIGURE 3.
  • Collar or stop member 56 on the plunger 44 will maintain the plunger in place within the chamber 58 of switch body 30 and will limit the plunger movement away from the contacts 46 and 48.
  • FIGURE 4 there is illustrated a schematic wiring diagram utilizing the high-pressure control switch of the present invention.
  • the compressor motor M is connected to the line T and T which are in turn connected to a power source.
  • the supply of power to the motor M is interrupted when the contacts 61a and 61b of the compressor motor start coil 62 are opened upon actuation of the relay 61.
  • the contactor relay 61 is disposed in a pilot circuit or low voltage circuit which is connected to a suitable source of low voltage by the lines L and L Provided in circuit with the contactor relay 61 in addition to the high-pressure control switch 22 may be a suitable low-pressure control switch 66, an external motor overload 68 and an inwinding thermostat 70.
  • the pressure switch 68 is adapted to sense suction line pressure and is adapted to close the electrical circuit on rising pressure and to open the electrical circuit on falling pressure.
  • the external overload switch 68 is disposed externally of the compressor and is responsive to current overload to terminate operation of the compressor motor M.
  • the thermostat or protective device 70 is preferably mounted in the stator slots or on the windings of the compressor motor for fast response to motor winding temperature.
  • the contactor relay 61 Upon opening of any one of the normally closed switches in the pilot circuit, the contactor relay 61 will be deenergized, thus opening the contacts 61a and 61b to terminate operation of the compressor motor.
  • the high-pressure control switch 22 of the present invention is integrally connected to the compression mechanism Within the outer casing of the compressor so as to detect discharge gas pressure at its source.
  • the high-pressure control switch is entirely within the sealed outer housing of the compressor and is, therefore, tamper proof. Further, it is noted that in the event thebellows or diaphragm 40 should rupture, there will be no escape of discharge gas from the discharge gas muffiing chamber. The discharge gas cannot, therefore, escape to the ambient, nor can it become mixed with the suction gas contained in the compressor between the compression mechanism and the outer casing.
  • a reliable, tamper-proof, high-pressure control switch for controlling the compressor motor that is carried on the compression means within the compressor at the source of discharge gas pressure.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid Mechanics (AREA)
  • Compressor (AREA)
  • Control Of Positive-Displacement Pumps (AREA)
US504328A 1965-10-24 1965-10-24 Hermetic compressor pressure switch Expired - Lifetime US3383031A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
US504328A US3383031A (en) 1965-10-24 1965-10-24 Hermetic compressor pressure switch
DE19661503445 DE1503445A1 (de) 1965-10-24 1966-05-18 Kolbenkompressor,insbesondere eine Hochdruckmotorsteuerungseinrichtung fuer einen hermetisch gekapselten Kuehlkompressor
NL6608183A NL6608183A (xx) 1965-10-24 1966-06-13
DK315066AA DK123548B (da) 1965-10-24 1966-06-17 Stempelkompressor.
BE684355D BE684355A (xx) 1965-10-24 1966-07-19
GB36294/66A GB1115598A (en) 1965-10-24 1966-08-12 Hermetic compressor pressure switch

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US504328A US3383031A (en) 1965-10-24 1965-10-24 Hermetic compressor pressure switch

Publications (1)

Publication Number Publication Date
US3383031A true US3383031A (en) 1968-05-14

Family

ID=24005791

Family Applications (1)

Application Number Title Priority Date Filing Date
US504328A Expired - Lifetime US3383031A (en) 1965-10-24 1965-10-24 Hermetic compressor pressure switch

Country Status (6)

Country Link
US (1) US3383031A (xx)
BE (1) BE684355A (xx)
DE (1) DE1503445A1 (xx)
DK (1) DK123548B (xx)
GB (1) GB1115598A (xx)
NL (1) NL6608183A (xx)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3877837A (en) * 1973-12-27 1975-04-15 Lennox Ind Inc Compressor control with thermal density sensor
US5285648A (en) * 1992-10-21 1994-02-15 General Electric Company Differential pressure superheat sensor for low refrigerant charge detection
US5503542A (en) * 1995-01-13 1996-04-02 Copeland Corporation Compressor assembly with welded IPR valve

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1881862A (en) * 1929-01-02 1932-10-11 Harry M Nacey Flow and pressure indicating means
US2435143A (en) * 1945-01-01 1948-01-27 Milwhite Co Inc Switch controlling assembly
US2518597A (en) * 1945-06-20 1950-08-15 Niagara Alkali Company Pumping apparatus
US2940395A (en) * 1956-01-20 1960-06-14 Perfect Circle Corp Control means for pumping apparatus
US3102677A (en) * 1959-09-17 1963-09-03 Smith Corp A O Safety circuit for compressor drive
US3132592A (en) * 1961-02-13 1964-05-12 Albert Products Inc Level controlled pumping systems and switch assemblies therefor
US3167293A (en) * 1962-06-26 1965-01-26 Carrier Corp Attachment for use with a reciprocating compressor
US3278111A (en) * 1964-07-27 1966-10-11 Lennox Ind Inc Device for detecting compressor discharge gas temperature

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1881862A (en) * 1929-01-02 1932-10-11 Harry M Nacey Flow and pressure indicating means
US2435143A (en) * 1945-01-01 1948-01-27 Milwhite Co Inc Switch controlling assembly
US2518597A (en) * 1945-06-20 1950-08-15 Niagara Alkali Company Pumping apparatus
US2940395A (en) * 1956-01-20 1960-06-14 Perfect Circle Corp Control means for pumping apparatus
US3102677A (en) * 1959-09-17 1963-09-03 Smith Corp A O Safety circuit for compressor drive
US3132592A (en) * 1961-02-13 1964-05-12 Albert Products Inc Level controlled pumping systems and switch assemblies therefor
US3167293A (en) * 1962-06-26 1965-01-26 Carrier Corp Attachment for use with a reciprocating compressor
US3278111A (en) * 1964-07-27 1966-10-11 Lennox Ind Inc Device for detecting compressor discharge gas temperature

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3877837A (en) * 1973-12-27 1975-04-15 Lennox Ind Inc Compressor control with thermal density sensor
US5285648A (en) * 1992-10-21 1994-02-15 General Electric Company Differential pressure superheat sensor for low refrigerant charge detection
US5503542A (en) * 1995-01-13 1996-04-02 Copeland Corporation Compressor assembly with welded IPR valve

Also Published As

Publication number Publication date
DK123548B (da) 1972-07-03
BE684355A (xx) 1967-01-19
GB1115598A (en) 1968-05-29
DE1503445A1 (de) 1970-08-13
NL6608183A (xx) 1967-04-25

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