EP3246571B1 - Verdichter - Google Patents

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Publication number
EP3246571B1
EP3246571B1 EP15877855.5A EP15877855A EP3246571B1 EP 3246571 B1 EP3246571 B1 EP 3246571B1 EP 15877855 A EP15877855 A EP 15877855A EP 3246571 B1 EP3246571 B1 EP 3246571B1
Authority
EP
European Patent Office
Prior art keywords
compressor
liquid surface
sealed container
unit
control unit
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.)
Not-in-force
Application number
EP15877855.5A
Other languages
English (en)
French (fr)
Other versions
EP3246571A1 (de
EP3246571A4 (de
Inventor
Shinya Morita
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Publication of EP3246571A1 publication Critical patent/EP3246571A1/de
Publication of EP3246571A4 publication Critical patent/EP3246571A4/de
Application granted granted Critical
Publication of EP3246571B1 publication Critical patent/EP3246571B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F04B39/06—Cooling; Heating; Prevention of freezing
    • 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
    • F04B35/00—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for
    • F04B35/04—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for the means being electric
    • 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
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/06—Control using electricity

Definitions

  • the present invention relates to a compressor.
  • Patent Literature 1 Japanese Unexamined Patent Application Publication No. 2006-47133
  • US 2004 0194485 A1 describes compressor protection from liquid hazards where two liquid levels are sensed in the oil sump of a compressor to determine if sufficient oil and excess refrigerant are present prior to starting the compressor and appropriate steps taken, if necessary.
  • US 3 744 267 describes a liquid level protection system for a refrigeration compressor.
  • WO 03 036090 A1 describes an apparatus for monitoring a compressor including a plurality of sensor inputs for receiving input regarding operating parameters of a compressor, at least one control action output for sending a control action to the compressor; and a control member communicated with the plurality of sensor inputs and the control action output, the control member being adapted to analyze input from the plurality of sensor inputs, to determine a control action based upon the input and to send the control action to the at least one control action output.
  • the target to be detected is the oil level, and thus the state of the liquid refrigerant stored inside the sealed container is not directly detectable. In such a case, it may be erroneously detected that no liquid refrigerant is stored inside the sealed container even when the liquid refrigerant is actually stored inside the sealed container, raising an issue of possible liquid compression.
  • the present invention has been made with the above-described issue as background, and aims to obtain a compressor that suppresses the liquid compression better than in the past.
  • a compressor according to an embodiment of the present invention is described in claim 1.
  • the present invention includes the control unit that drives the heating unit when the liquid surface level obtained by the liquid surface sensor is equal to or higher than the reference level. It is therefore possible to suppress the compression of the liquid refrigerant inside the sealed container. Accordingly, it is possible to suppress the liquid compression better than in the past.
  • Embodiment 1 of the present invention will be described below based on the drawings.
  • the dimensional relationships between component members may be different from actual ones.
  • parts assigned with identical signs are identical or correspond to each other. This applies to the entire text of the specification.
  • forms of component elements described in the entire text of the specification are merely illustrative, and the present invention is not limited by the description of these.
  • Fig. 1 is a diagram illustrating an outline of a compressor 100 according to Embodiment 1 of the present invention.
  • Fig. 2 is a sectional view taken along line A-A in Fig.
  • the compressor 100 is a scroll compressor.
  • the compressor 100 includes a suction pipe 1, a compression mechanism unit 2, an oil drain unit 4, a liquid surface sensor 10, a temperature sensor 20, and a heating unit 30.
  • the exterior of the compressor 100 is formed of a sealed container 100A.
  • Refrigerating machine oil (hereinafter occasionally simply referred to as the oil) is stored in a lower portion inside the sealed container 100A.
  • the suction pipe 1 is a pipe provided to an upper portion of a side surface of the sealed container 100A.
  • the interior of the suction pipe 1 and the interior of the sealed container 100A communicate with each other.
  • the suction pipe 1 is supplied with refrigerant flowing on a suction side of the compressor 100.
  • the compression mechanism unit 2 is a part that compresses the refrigerant supplied into the sealed container 100A through the suction pipe 1.
  • the compression mechanism unit 2 has a suction port 2a.
  • the refrigerant flowing through the sealed container 100A is supplied to the compression mechanism unit 2 through the suction port 2a.
  • a lower portion of the sealed container 100A has a sump unit 3.
  • the sump unit 3 stores the oil.
  • the oil drain unit 4 is a member for draining the oil stored in the sump unit 3 to the outside of the sealed container 100A, and is provided to a lower portion of the side surface of the sealed container 100A, for example.
  • the oil drain unit 4 is formed of a hollow tubular member, for example.
  • the oil drain unit 4 includes therein an openable and closable valve (illustration omitted), for example.
  • the amount of oil flowing through the oil drain unit 4 is adjustable through adjustment of the valve. If the oil drain unit 4 is opened, the oil stored in the lower portion of the sealed container 100A is discharged to the outside of the sealed container 100A through the oil drain unit 4. If the oil drain unit 4 is closed, the oil stored in the lower portion of the sealed container 100A continues to be stored inside the sealed container 100A without passing through the oil drain unit 4.
  • the liquid surface sensor 10 is a detecting unit for detecting the liquid surface of the liquid refrigerant stored inside the sealed container 100A, and is provided at a position corresponding to the height of the suction pipe 1.
  • the liquid surface sensor 10 is provided below an upper end portion 1A of the suction pipe 1 and above a lower end portion 1B of the suction pipe 1.
  • the liquid surface sensor 10 is installed in the vicinity of the suction port 2a, for example.
  • the temperature sensor 20 is a temperature detecting unit provided to the lower portion inside the sealed container 100A. The temperature sensor 20 detects the temperature of the lower portion of the sealed container 100A.
  • the heating unit 30 is a heating unit that heats the liquid refrigerant stored inside the sealed container 100A, and is provided in the lower portion of the sealed container 100A, for example. With the heating unit 30 driven, the liquid refrigerant stored inside the sealed container 100A is heated and gasified, and the liquid surface of the liquid refrigerant stored inside the sealed container 100A falls.
  • a control unit drives the heating unit 30, when the liquid surface level obtained by the liquid surface sensor 10 is equal to or higher than a reference level. Specifically, for example, the control unit drives the heating unit 30, when the height of the liquid surface inside the sealed container 100A is equal to or higher than the height of the suction pipe 1.
  • the control unit is provided in, for example, a mechanical chamber formed inside an outdoor unit. Further, the control unit controls the opening and closing of the oil drain unit 4.
  • the control unit may be capable of controlling the oil drain unit 4 only between two states, which are an "open" state and a "closed” state, or may be capable of changing the opening degree of the oil drain unit 4 in a plurality of stages.
  • the control unit is configured of hardware such as a circuit device that implements this function or software executed on an arithmetic device such as a microcomputer or a CPU.
  • Fig. 3 is a chart illustrating a control operation of the compressor 100 according to Embodiment 1 of the present invention.
  • Embodiment 1 a case is assumed in which the stagnation of the liquid refrigerant occurs for a reason such as the shutdown of the compressor 100 for an extended period of time, and the height of the liquid surface inside the sealed container 100A of the compressor 100 is measured before the start-up of the compressor 100 (when start-up control of the compressor 100 is performed).
  • An operation of the compressor 100 according to Embodiment 1 performed before the start-up will be described below with Fig. 3 .
  • control unit determines at step S21 that the liquid surface level obtained by the liquid surface sensor 10 is equal to or higher than the reference level (YES at step S21)
  • the control unit proceeds to step S32 to drive the heating unit 30 or perform a liquid purge operation, and proceeds to step S21.
  • control unit determines at step S21 that the liquid surface level obtained by the liquid surface sensor 10 is not equal to or higher than the reference level (NO at step S21)
  • the control unit proceeds to step S22 to start up the compressor 100.
  • the compressor 100 has the sealed container 100A forming the exterior thereof, and includes the suction pipe 1 connected to the side surface portion of the sealed container 100A to allow the refrigerant flowing on the suction side of the compressor 100 to pass through the suction pipe 1, the liquid surface sensor 10 that detects the liquid surface level inside the sealed container 100A, the heating unit 30 provided inside the sealed container 100A, and the control unit that drives the heating unit 30 when the liquid surface level obtained by the liquid surface sensor 10 is equal to or higher than the reference level before the start-up of the compressor 100.
  • the control unit that drives the heating unit 30 when the liquid surface level obtained by the liquid surface sensor 10 is equal to or higher than the reference level before the start-up of the compressor 100.
  • liquid surface sensor 10 provided at the position corresponding to the height of the suction pipe 1, it is possible to further reduce the possibility that the liquid refrigerant stored inside the sealed container 100A may flow to the suction side of the compressor 100 through the suction pipe 1. Accordingly, it is possible to suppress the damage to the compressor 100 due to the start-up with the liquid compression of the stagnated liquid refrigerant (stagnation start-up).
  • control unit controls the compressor 100 during the operation of the compressor 100, unlike in Embodiment 1.
  • items not particularly described will be assumed to be similar to those of Embodiment 1, and identical functions or configurations will be described with identical signs.
  • Fig. 4 is a chart illustrating a control operation of the compressor 100 according to Embodiment 2 of the present invention.
  • the control unit performs drive control of the heating unit 30 during the operation of the compressor 100 to prevent the liquid compression.
  • An operation of the compressor 100 according to Embodiment 2 will be described below with Fig. 4 .
  • control unit performs the start-up control of the compressor 100, and proceeds to step S21.
  • control unit determines whether or not the liquid surface level obtained by the liquid surface sensor 10 is equal to or higher than the reference level.
  • control unit determines at step S21 that the liquid surface level obtained by the liquid surface sensor 10 is equal to or higher than the reference level (YES at step S21)
  • the control unit proceeds to step S31.
  • control unit determines at step S21 that the liquid surface level obtained by the liquid surface sensor 10 is not equal to or higher than the reference level (NO at step S21)
  • the control unit proceeds to step S23 and continues to drive the compressor 100.
  • step S31 the control unit stops the compressor 100, and proceeds to step S32.
  • step S32 the control unit drives the heating unit 30 or performs the liquid purge operation, and proceeds to step S41.
  • step S41 the control unit starts up the compressor 100, and proceeds to step S21. The processes of steps S31 and S41 may be omitted.
  • the control unit drives the heating unit 30. Therefore, only the gas refrigerant is taken into the compression mechanism unit 2, making it possible to suppress the liquid compression better than in the past. Accordingly, it is possible to suppress the damage to the compressor 100 due to a liquid compression operation.
  • control unit controls the compressor 100 during the operation of the compressor 100, unlike in Embodiment 1.
  • items not particularly described will be assumed to be similar to those of Embodiment 1, and identical functions or configurations will be described with identical signs.
  • Fig. 5 is a chart illustrating a control operation of the compressor 100 according to Embodiment 3 of the present invention.
  • the control unit controls the oil drain unit 4 during the operation of the compressor 100 to prevent oil compression.
  • An operation of the compressor 100 according to Embodiment 3 will be described below with Fig. 5 .
  • control unit performs the start-up control of the compressor 100, and proceeds to step S21.
  • control unit determines whether or not the liquid surface level obtained by the liquid surface sensor 10 is equal to or higher than the reference level.
  • control unit determines at step S21 that the liquid surface level obtained by the liquid surface sensor 10 is equal to or higher than the reference level (YES at step S21)
  • the control unit proceeds to step S31.
  • control unit determines at step S21 that the liquid surface level obtained by the liquid surface sensor 10 is not equal to or higher than the reference level (NO at step S21)
  • the control unit proceeds to step S23 and continues to drive the compressor 100.
  • step S31 the control unit stops the compressor 100, and proceeds to step S32.
  • step S32 the control unit drives the heating unit 30 or performs the liquid purge operation for a predetermined time, and proceeds to step S33.
  • step S33 the control unit determines whether or not the liquid surface level obtained by the liquid surface sensor 10 is equal to or higher than the reference level.
  • control unit determines at step S33 that the liquid surface level obtained by the liquid surface sensor 10 is equal to or higher than the reference level (YES at step S33)
  • the control unit proceeds to step S34.
  • control unit determines at step S33 that the liquid surface level obtained by the liquid surface sensor 10 is not equal to or higher than the reference level (NO at step S33)
  • the control unit proceeds to step S23 and continues to drive the compressor 100.
  • the control unit controls the oil drain unit 4 to perform an oil drain operation, and proceeds to step S41.
  • the oil drain operation is, for example, an operation of draining the oil stored in the sump unit 3 to the outside of the sealed container 100A through the oil drain unit 4.
  • the control unit starts up the compressor 100, and proceeds to step S21. The processes of steps S31 and S41 may be omitted.
  • control unit may continue to perform the drive control of the heating unit 30 during the oil drain operation, or may stop the drive control of the heating unit 30 during the oil drain operation.
  • the control unit drives the heating unit 30 when the liquid surface level obtained by the liquid surface sensor 10 is equal to or higher than the reference level.
  • the control unit controls the oil drain unit 4 to drain the oil to the outside of the sealed container 100A.
  • the present invention is not limited thereto, and a plurality of liquid surface sensors 10 may be provided. With the plurality of liquid surface sensors 10 thus provided, it is possible to more accurately detect the liquid surface inside the sealed container 100A than in the case in which the single liquid surface sensor 10 is provided.
  • an electrostatic capacitance sensor or a float sensor may be adopted as the liquid surface sensor 10.
  • the liquid surface inside the sealed container 100A is detectable even under a severe environment, such as an environment in which the pressure inside the sealed container 100A is high.
  • the float sensor is adopted as the liquid surface sensor 10
  • the liquid surface inside the sealed container 100A is detectable at low cost with a simple structure.
  • the reference level used at step S33 may be set to be lower than the reference level used at step S21.
  • the control unit is capable of determining an excess of oil at step S33 and draining the oil stored inside the sealed container 100A.
  • the reference level used at step S33 is determined as follows, for example.
  • the control unit stores the degree of fall of the liquid surface level inside the sealed container 100A to the driving time of the heating unit 30. Then, at step S33, when the degree of fall of the liquid surface level to the driving time of the heating unit 30 is less than the degree of fall of the liquid surface level inside the sealed container 100A to the driving time of the heating unit 30 stored by the control unit, the control unit proceeds to step S34.
  • suction pipe 1 suction pipe 1A upper end portion 1B lower end portion 2 compression mechanism unit 2a suction port 3 sump unit 4 oil drain unit 10 liquid surface sensor 20 temperature sensor 30 heating unit 100 compressor 100A sealed container

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Positive-Displacement Pumps (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
  • Compressor (AREA)

Claims (3)

  1. Kompressor (100) mit einem abgedichteten Behälter (100A), der ein Äußeres davon bildet, wobei der Kompressor (100) Folgendes umfasst:
    ein Saugrohr (1), das mit einem Seitenflächenabschnitt des abgedichteten Behälters (100A) verbunden ist, um ein Kältemittel, das auf einer Saugseite des Kompressors (100) strömt, durch das Saugrohr (1) hindurchtreten zu lassen;
    einen Flüssigkeitsoberflächensensor (10), der ausgelegt ist, um einen Flüssigkeitsoberflächenpegel innerhalb des abgedichteten Behälters (100A) zu detektieren;
    eine Heizeinheit (30), die im Inneren des abgedichteten Behälters (100A) bereitgestellt ist; und
    eine Steuereinheit, die ausgelegt ist, um die Heizeinheit (30) anzusteuern, wenn der durch den Flüssigkeitsoberflächensensor (10) erhaltene Flüssigkeitsoberflächenpegel gleich oder höher als ein Referenzpegel ist,
    dadurch gekennzeichnet, dass die Steuereinheit ausgelegt ist, um die Heizeinheit (30) anzusteuern, wenn der durch den Flüssigkeitsoberflächensensor (10) erhaltene Flüssigkeitsoberflächenpegel nach dem Start des Kompressors (100) gleich oder höher als ein Referenzpegel ist, und ferner umfassend
    eine Ölablasseinheit (4), die ausgelegt ist, um in dem abgedichteten Behälter (100A) gespeichertes Öl aus dem abgedichteten Behälter (100A) nach außen abzulassen,
    wobei die Steuereinheit nach dem Start des Kompressors (100) und wenn der durch den Flüssigkeitsoberflächensensor (10) erhaltene Flüssigkeitsoberflächenpegel nach dem Ansteuern der Heizeinheit (30) gleich oder höher als ein Referenzpegel ist, ausgelegt ist, um die Ölablasseinheit (4) zu steuern, um das Öl aus dem abgedichteten Behälter (100A) nach außen abzulassen.
  2. Kompressor (100) nach Anspruch 1, wobei der Referenzpegel gleich oder höher als ein unterer Endabschnitt (1B) des Saugrohrs (1) und gleich oder niedriger als ein oberer Endabschnitt (1A) des Saugrohrs (1) ist.
  3. Kompressor (100) nach einem der Ansprüche 1 oder 2, ferner umfassend eine Kompressionsmechanismuseinheit (2), die ausgelegt ist, um das durch das Saugrohr (1) angesaugte Kältemittel zu komprimieren,
    wobei die Kompressionsmechanismuseinheit (2) eine Saugöffnung (2a) aufweist, in die das von dem Saugrohr (1) angesaugte Kältemittel eingebracht wird, und
    wobei der Flüssigkeitsoberflächensensor (10) an der Saugöffnung (2a) der Kompressionsmechanismuseinheit (2) bereitgestellt ist.
EP15877855.5A 2015-01-16 2015-01-16 Verdichter Not-in-force EP3246571B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2015/051073 WO2016113903A1 (ja) 2015-01-16 2015-01-16 圧縮機

Publications (3)

Publication Number Publication Date
EP3246571A1 EP3246571A1 (de) 2017-11-22
EP3246571A4 EP3246571A4 (de) 2018-06-20
EP3246571B1 true EP3246571B1 (de) 2020-12-23

Family

ID=56405464

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15877855.5A Not-in-force EP3246571B1 (de) 2015-01-16 2015-01-16 Verdichter

Country Status (3)

Country Link
EP (1) EP3246571B1 (de)
JP (1) JP6305569B2 (de)
WO (1) WO2016113903A1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115854242B (zh) * 2022-10-27 2026-02-06 沈阳鼓风机集团齿轮压缩机有限公司 润滑油用油箱、控制方法及相关设备

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3766747A (en) * 1972-01-06 1973-10-23 Lennox Ind Inc Liquid sensor for reciprocating refrigerant compressor
US3744267A (en) * 1972-03-15 1973-07-10 Borg Warner Liquid level protection system for refrigeration compressor
JPS62180U (de) * 1985-06-18 1987-01-06
US20030077179A1 (en) * 2001-10-19 2003-04-24 Michael Collins Compressor protection module and system and method incorporating same
US6886354B2 (en) * 2003-04-04 2005-05-03 Carrier Corporation Compressor protection from liquid hazards

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
EP3246571A1 (de) 2017-11-22
EP3246571A4 (de) 2018-06-20
JPWO2016113903A1 (ja) 2017-06-08
WO2016113903A1 (ja) 2016-07-21
JP6305569B2 (ja) 2018-04-04

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