WO2018110331A1 - Compressor unit and outdoor unit provided therewith - Google Patents

Compressor unit and outdoor unit provided therewith Download PDF

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Publication number
WO2018110331A1
WO2018110331A1 PCT/JP2017/043384 JP2017043384W WO2018110331A1 WO 2018110331 A1 WO2018110331 A1 WO 2018110331A1 JP 2017043384 W JP2017043384 W JP 2017043384W WO 2018110331 A1 WO2018110331 A1 WO 2018110331A1
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WO
WIPO (PCT)
Prior art keywords
accumulator
compressor
oil return
refrigerant
return pipe
Prior art date
Application number
PCT/JP2017/043384
Other languages
French (fr)
Japanese (ja)
Inventor
恵介 三苫
晋一 五十住
正也 倉地
貴之 服部
江口　剛
Original Assignee
三菱重工サーマルシステムズ株式会社
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.)
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Publication date
Application filed by 三菱重工サーマルシステムズ株式会社 filed Critical 三菱重工サーマルシステムズ株式会社
Priority to EP17880364.9A priority Critical patent/EP3495746A4/en
Publication of WO2018110331A1 publication Critical patent/WO2018110331A1/en

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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
    • F25B31/002—Lubrication
    • F25B31/004—Lubrication oil recirculating arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
    • F24F1/08—Compressors specially adapted for separate outdoor units
    • F24F1/10—Arrangement or mounting thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
    • F24F1/26—Refrigerant piping
    • F24F1/30—Refrigerant piping for use inside the separate outdoor 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
    • F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
    • F25B43/006—Accumulators
    • 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
    • F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
    • F25B43/02—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat for separating lubricants from the refrigerant
    • 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
    • F25B2500/13—Vibrations
    • 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
    • F25B2500/16—Lubrication
    • 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
    • F25B2500/28—Means for preventing liquid refrigerant entering into the compressor

Definitions

  • the present invention relates to a compressor unit provided with an accumulator and an outdoor unit provided with the same.
  • the outdoor unit of the air conditioner is provided with a compressor that compresses a refrigerant.
  • a compression unit such as a scroll unit is driven by an electric motor, and the refrigerant sucked from the suction pipe is compressed.
  • An accumulator for separating the refrigerant returning to the compressor from gas to liquid is connected to the suction pipe.
  • the gas refrigerant separated by the accumulator is led to the compressor through the suction pipe.
  • an oil return pipe for returning the lubricating oil to the compressor together with the liquid refrigerant separated and stored is provided.
  • the compressor is a vibration source because an electric motor is provided. Therefore, the vibration from the compressor is transmitted to the oil return pipe connected between the accumulator and the compressor side. In particular, as a result of investigations by the present inventors, it has been found that the vibration from the compressor can not be ignored, for example, in a compressor whose rotational speed is increased to reach 200 rps over 130 rps.
  • the present invention has been made in view of such circumstances, and provides a compressor unit that reduces the stress of oil return piping connecting an accumulator and a compressor, and an outdoor unit provided with the same. With the goal.
  • a compressor unit according to one aspect of the present invention is provided between a compressor that compresses a refrigerant, an accumulator that separates the refrigerant introduced to the compressor from gas to liquid, and the compressor and the accumulator.
  • the capillary unit has a winding shape, and a fixing bracket that fixes the oil return pipe below the capillary unit to the accumulator.
  • the liquid refrigerant separated by the accumulator is led to the suction pipe through the oil return pipe together with the lubricating oil, and is returned to the compressor. Vibration of the compressor is transmitted to the oil return pipe via the suction pipe. Since the oil return pipe is provided with a capillary portion having a winding shape, there is a possibility that the capillary portion which is a heavy load vibrates largely and the stress of the pipe around the capillary portion is increased. Therefore, a fixing bracket for fixing the oil return pipe below the capillary portion to the accumulator was provided. Thereby, the vibration of the capillary portion can be suppressed, and the stress of the oil return pipe can be reduced.
  • a bent portion is formed in the oil return pipe below the capillary portion, and the fixed bracket is provided below the bent portion. There is.
  • the accumulator includes a substantially hemispherical bottom portion and a cylindrical portion connected to the upper side of the bottom portion, and the fixing bracket is the cylindrical portion It is fixed to the lower end.
  • the accumulator has a substantially hemispherical bottom and a cylinder connected to the bottom.
  • the fixing bracket is fixed to the accumulator by welding or the like, the bottom portion has a substantially hemispherical shape, which makes installation difficult. Therefore, the fixing bracket is fixed to the cylindrical portion. Further, by fixing the fixing bracket to the lower end of the cylindrical portion, the oil return pipe can be fixed at a position away from the capillary portion. Thereby, piping stress around the capillary portion can be reduced.
  • the piping side fixed position is provided at a lower position.
  • the oil return pipe side fixing position in which the other end of the fixing bracket is fixed to the oil return pipe is lower than the accumulator side fixing position in which one end of the fixing bracket is fixed to the accumulator.
  • the outdoor unit which concerns on 1 aspect of this invention is equipped with said compressor unit and the housing
  • Piping stress can be reduced by suppressing the vibration of the oil return pipe connecting between the accumulator and the compressor by the fixed bracket.
  • FIG. 1 shows a refrigerant circuit diagram of a multi-type air conditioning system in which a plurality of indoor units are connected to one outdoor unit. Note that there may be a plurality of outdoor units.
  • a plurality of indoor units 3A and 3B are connected in parallel to one outdoor unit 2.
  • the plurality of indoor units 3A, 3B are connected in parallel with each other between the gas side pipe 4 connected to the outdoor unit 2 and the liquid side pipe 5 via the branching unit 6.
  • the outdoor unit 2 includes an inverter-driven compressor 10 for compressing a refrigerant, a four-way switching valve 12 for switching the circulation direction of the refrigerant, an outdoor heat exchanger 13 for heat exchange between the refrigerant and the outside air, and an outdoor heat exchanger 13 A supercooling coil 14 integrally formed, an outdoor expansion valve (EEVH) 15, a receiver 16 for storing liquid refrigerant, a subcooling heat exchanger 17 for supercooling the liquid refrigerant, and supercooling heat exchange Supercooling expansion valve (EEVSC) 18 that controls the amount of refrigerant that is diverted to the compressor 17 and an accumulator that separates the liquid from the refrigerant gas that is sucked into the compressor 10 and that only the gas is sucked into the compressor 10 A gas side operation valve 20 and a liquid side operation valve 21 are provided.
  • EVH outdoor expansion valve
  • EVSC supercooling heat exchange Supercooling expansion valve
  • the compressor 10 can rotate to over 200 rps over 130 rps.
  • An oil separator 26 is connected to the discharge side of the compressor 10 via a discharge pipe 25.
  • misty lubricating oil (oil) in the compressed refrigerant is separated from the refrigerant.
  • the refrigerant from which the misty lubricating oil has been separated by the oil separator 26 is led to the four-way switching valve 12.
  • the accumulator 19 is provided with an oil return pipe 35 for returning the liquid refrigerant separated by the accumulator 19 to the suction pipe 34 together with the lubricating oil.
  • the oil return pipe 35 is provided with a capillary portion 36.
  • the capillary portion 36 is used as a fixed throttle to reduce the pressure of the passing liquid refrigerant and lubricating oil.
  • the above-described devices on the outdoor unit 2 side are sequentially connected via the refrigerant pipe 22 to constitute a known outdoor-side refrigerant circuit 23. Further, the outdoor unit 2 is provided with an outdoor fan 24 for blowing the outside air to the outdoor heat exchanger 13.
  • the gas side pipe 4 and the liquid side pipe 5 are refrigerant pipes connected to the gas side operation valve 20 and the liquid side operation valve 21 of the outdoor unit 2, and are connected to the outdoor unit 2 at the time of installation and construction at the site
  • the pipe length is appropriately set in accordance with the distance between the plurality of indoor units 3A and 3B.
  • a plurality of branching devices 6 are provided in the middle of the gas side piping 4 and the liquid side piping 5, and an appropriate number of indoor units 3A and 3B are connected via the branching devices 6.
  • a closed refrigeration cycle (refrigerant circuit) 7 is configured.
  • the indoor units 3A and 3B heat exchange the indoor air with the refrigerant, cool or heat them, and provide the indoor air conditioning with the indoor heat exchanger 30, the indoor expansion valve (EEVC) 31, and the indoor heat exchanger 30.
  • An indoor fan 32 for circulating indoor air and an indoor controller 33 are provided, and are connected to the branching unit 6 via the branch gas side pipes 4A, 4B and the branch liquid side pipes 5A, 5B on the indoor side.
  • the cooling operation is performed as follows.
  • the high-temperature, high-pressure refrigerant gas compressed and discharged by the compressor 10 is circulated to the outdoor heat exchanger 13 by the four-way switching valve 12 and is heat exchanged with the outside air blown by the outdoor fan 24 by the outdoor heat exchanger 13 It is condensed and liquefied.
  • the liquid refrigerant is further cooled by the subcooling coil 14, passes through the outdoor expansion valve 15, and is temporarily stored in the receiver 16.
  • the liquid refrigerant whose circulation amount has been adjusted by the receiver 16 is partially flowed from the liquid refrigerant piping in the process of being circulated through the liquid refrigerant piping side through the subcooling heat exchanger 17 and adiabatically expanded by the subcooling expansion valve 18
  • the heat is exchanged with the refrigerant to give a degree of subcooling.
  • the liquid refrigerant is led from the outdoor unit 2 to the liquid side pipe 5 through the liquid side operation valve 21 and is branched to the branched liquid side pipes 5A, 5B of the indoor units 3A, 3B through the branching unit 6. .
  • the liquid refrigerant divided into the branched liquid side pipes 5A, 5B flows into the indoor units 3A, 3B, is adiabatically expanded by the indoor expansion valve 31, and flows into the indoor heat exchanger 30 as a gas-liquid two-phase flow. Ru.
  • the indoor heat exchanger 30 the indoor air and the refrigerant circulated by the indoor fan 32 exchange heat, and the indoor air is cooled and provided for indoor cooling.
  • the refrigerant is gasified, passes through the branch gas side pipes 4A, 4B, and reaches the branch 6, and is merged with the refrigerant gas from other indoor units by the gas side pipe 4.
  • the refrigerant gas joined in the gas side pipe 4 is returned to the outdoor unit 2 again, passes through the gas side operation valve 20 and the four-way switching valve 12 and is joined with the refrigerant gas from the subcooling heat exchanger 17. Introduced to In the accumulator 19, the liquid contained in the refrigerant gas is separated, and only the gas is drawn into the compressor 10. The refrigerant is compressed again in the compressor 10, and the cooling operation is performed by repeating the above cycle. The liquid refrigerant separated by the accumulator 19 is stored at the bottom of the accumulator 19 and is led to the suction pipe 34 via the oil return pipe 35 together with the lubricating oil.
  • the heating operation is performed as follows.
  • the high-temperature, high-pressure refrigerant gas compressed and discharged by the compressor 10 is circulated to the gas-side operation valve 20 via the four-way switching valve 12.
  • the high pressure gas refrigerant is led from the outdoor unit 2 through the gas side operation valve 20 and the gas side pipe 4 and passes through the branching unit 6 and the branch gas side pipes 4A and 4B on the indoor side to a plurality of indoor units 3A and 3B. be introduced.
  • the high temperature / high pressure refrigerant gas introduced into the indoor units 3A, 3B is heat exchanged with the indoor air circulated through the indoor fan 32 by the indoor heat exchanger 30, and the indoor air heated by this is blown out into the room It is served for heating.
  • the refrigerant condensed and liquefied by the indoor heat exchanger 30 passes through the indoor expansion valve 31 and the branch liquid side pipes 5A and 5B to reach the branch 6, and is merged with the refrigerant from the other indoor units. And return to the outdoor unit 2.
  • the degree of opening of the indoor expansion valve 31 is the indoor controller so that the refrigerant outlet temperature or the degree of refrigerant supercooling of the indoor heat exchanger 30 functioning as a condenser becomes the control target value. It is controlled via 33.
  • the refrigerant returned to the outdoor unit 2 passes through the liquid side operation valve 21 to reach the subcooling heat exchanger 17, and after being subcooled as in the case of cooling, flows into the receiver 16 and is temporarily stored. Thus, the circulation amount is adjusted.
  • the liquid refrigerant is supplied to the outdoor expansion valve 15 and adiabatically expanded, and then flows into the outdoor heat exchanger 13 through the subcooling coil 14.
  • the refrigerant exchanges heat with the outside air blown from the outdoor fan 24, and the refrigerant absorbs heat from the outside air to be vaporized and gasified.
  • the refrigerant is introduced from the outdoor heat exchanger 13 through the four-way switching valve 12 to the refrigerant gas from the subcooling heat exchanger 17 and then introduced into the accumulator 19.
  • the liquid contained in the refrigerant gas is separated, and only the gas is drawn into the compressor 10 and compressed again in the compressor 10.
  • the heating operation is performed by repeating the above cycle.
  • the liquid refrigerant separated by the accumulator 19 is stored at the bottom of the accumulator 19 and is led to the suction pipe 34 via the oil return pipe 35 together with the lubricating oil.
  • the compressor 10 has a substantially cylindrical shape having an axis extending in the vertical direction.
  • An electric motor (not shown) is accommodated in the lower portion of the compressor 10, and a compression mechanism (not shown) such as a scroll portion is accommodated in the upper portion.
  • the accumulator 19 is erected with an axis in the vertical direction, and is formed of a substantially hemispherical bottom 19a, a substantially hemispherical top 19b, and a cylindrical portion 19c sandwiched between the bottom 19a and the top 19b. It has a bowl shape.
  • the accumulator 19 is fixed to a bottom plate (not shown) via the legs 19 d.
  • the upstream end 34 a of the suction pipe 34 is connected to the top of the accumulator 19.
  • the downstream end 34 b of the suction pipe 34 is connected to the compressor 10. After rising from the top of the accumulator 19, the suction pipe 34 extends laterally and is further bent downward, and after being folded in a U-shape at the lower turnback portion 34c, is raised again upward. . Then, after the suction pipe 34 is raised upward, it extends laterally, is lowered again again, and is finally connected to the side of the compressor 10.
  • the oil return pipe 35 is provided between the accumulator 19 and the suction pipe 34, and is a pipe made of metal such as stainless steel or copper alloy.
  • the upstream end 35 a of the oil return pipe 35 is connected to the lower end of the bottom 19 a of the accumulator 19.
  • the downstream end 35 b of the oil return pipe 35 is connected to a position near the folded portion 34 c below the suction pipe 34 and at an intermediate position of the height of the compressor 10.
  • the capillary portion 36 is provided at an intermediate position of the oil return pipe 35, and has a winding shape in which a thin tube having a pipe diameter smaller than the pipe diameter of the oil return pipe 35 is wound a plurality of times.
  • the capillary portion 36 is provided near the downstream end 35 b of the oil return pipe 35 and at substantially the same height position as the downstream end 35 b.
  • the oil return pipe 35 connected to the upstream side (left side in FIG. 2) of the capillary portion 36 has a vertical portion 35 d extending downward in a substantially vertical direction after being bent in a substantially L shape at the bending portion 35 c doing.
  • the fixing bracket 37 is fixed to the vertical portion 35d.
  • the fixing bracket 37 is a sheet metal formed into a predetermined shape.
  • the accumulator side fixed position 37 a of the fixed bracket 37 is provided by welding to the side portion of the lower end of the cylindrical portion 19 c of the accumulator 19.
  • the fixed bracket extends in the horizontal direction starting from the accumulator side fixed position 37a. Therefore, the oil return piping side fixing position 37b of the fixing bracket 37 is at the same height position as the accumulator side fixing position 37a, and is provided below the capillary portion 36 and the bending portion 35c.
  • the vibration of the compressor 10 is transmitted to the oil return pipe 35 via the suction pipe 34. Since the oil return pipe 35 is provided with the capillary portion 36 having a winding shape, there is a possibility that the capillary portion 36 serving as a heavy object vibrates largely and the stress of the pipe around the capillary portion 36 is increased.
  • the fixing bracket 37 for fixing the vertical portion 35 d of the oil return pipe 35 below the capillary portion 36 to the accumulator 19 is provided. Thereby, the vibration of the capillary portion 36 can be suppressed, and the stress of the oil return pipe 35 can be reduced.
  • bent portion 35c is formed in the oil return pipe 35 below the capillary portion 36, stress concentrates on the bent portion 35c. Therefore, by providing the fixing bracket 37 below the bent portion 35c, it is possible to suppress the vibration generated in the bent portion 35c and reduce the piping stress.
  • the fixing bracket 37 is fixed to the cylindrical portion 19 c of the accumulator 19.
  • the oil return pipe 35 can be fixed at the oil return pipe side fixing position 37b separated downward from the capillary portion 36. Thereby, the stress generated in the piping around the capillary portion 36 can be reduced.
  • the fixing bracket 38 has a shape bent in the vertical direction so as to make the heights of the fixing positions of the both ends different. That is, the accumulator side fixed position 38a of the fixed bracket 38 is provided at the lower end of the cylindrical portion 19c of the accumulator 19 as in the first embodiment, while the oil return piping side fixed position 38b of the fixed bracket 38 is an accumulator It is provided below the side fixed position 38a.
  • the stress generated in the oil return pipe 35 below the capillary portion 36 can be further reduced.
  • compressor 10 which can be rotated to 200 rps more than 130 rps
  • the present invention is not limited to this,
  • the number of compressor rotations of 130 rps or less may be sufficient.
  • the compressor rotational speed may exceed 200 rps.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Analytical Chemistry (AREA)
  • Power Engineering (AREA)
  • Other Air-Conditioning Systems (AREA)

Abstract

This compressor unit is provided with a compressor (10) which compresses a refrigerant, an accumulator (19) which performs gas-liquid separation on a refrigerant guided to the compressor (10), a suction tube (34) which is provided between the compressor (10) and the accumulator (19) and which guides gas refrigerant separated in the accumulator (19) into the compressor (10), an oil return tube (35) which is connected between the bottom of the accumulator (19) and the suction tube (34), a capillary unit (36) formed in a winding shape and provided in an intermediate position of the oil return tube, and a fixing bracket (37) which fixes the oil return tube (35) below the capillary unit (36) to the accumulator (19).

Description

圧縮機ユニット及びこれを備えた室外機Compressor unit and outdoor unit equipped with the same
　本発明は、アキュムレータを備えた圧縮機ユニット及びこれを備えた室外機に関するものである。 The present invention relates to a compressor unit provided with an accumulator and an outdoor unit provided with the same.
　空調機の室外機には、冷媒を圧縮する圧縮機が設けられている。圧縮機は、電動モータによってスクロール部等の圧縮部が駆動され、吸入配管から吸い込んだ冷媒を圧縮する。 The outdoor unit of the air conditioner is provided with a compressor that compresses a refrigerant. In the compressor, a compression unit such as a scroll unit is driven by an electric motor, and the refrigerant sucked from the suction pipe is compressed.
　吸入配管には、圧縮機へ戻る冷媒を気液分離するためのアキュムレータが接続されている。アキュムレータで分離されたガス冷媒は、吸入配管を通り圧縮機へと導かれる。アキュムレータの底部には、分離されて貯留された液冷媒とともに潤滑油を圧縮機へと戻す油戻し配管が設けられている（特許文献１参照）。 An accumulator for separating the refrigerant returning to the compressor from gas to liquid is connected to the suction pipe. The gas refrigerant separated by the accumulator is led to the compressor through the suction pipe. At the bottom of the accumulator, there is provided an oil return pipe for returning the lubricating oil to the compressor together with the liquid refrigerant separated and stored (see Patent Document 1).
実開昭６０－１８２６７８号公報（第１図）Japanese Utility Model Publication No. 60-182678 (FIG. 1)
　圧縮機は、電動モータが設けられているため振動発生源となる。したがって、アキュムレータと圧縮機側との間に接続された油戻し配管には、圧縮機からの振動が伝達される。特に、本発明者等が検討したところ、例えば１３０ｒｐｓを超えて２００ｒｐｓまで到達するような高回転数化した圧縮機では、圧縮機からの振動は無視できないものになることが判明した。 The compressor is a vibration source because an electric motor is provided. Therefore, the vibration from the compressor is transmitted to the oil return pipe connected between the accumulator and the compressor side. In particular, as a result of investigations by the present inventors, it has been found that the vibration from the compressor can not be ignored, for example, in a compressor whose rotational speed is increased to reach 200 rps over 130 rps.
　油戻し配管に振動が伝達されると、油戻し配管に生じる応力が大きくなる。油戻し配管に巻線形状のキャピラリ部が設けられている場合には、キャピラリ部に重量が集中するため油戻し配管の振動がさらに大きくなり、キャピラリ部周りの配管応力が増大するという問題がある。 When vibration is transmitted to the oil return pipe, the stress generated in the oil return pipe increases. If the oil return pipe is provided with a winding-shaped capillary portion, the weight is concentrated on the capillary portion, so the vibration of the oil return pipe becomes larger and there is a problem that the pipe stress around the capillary portion increases. .
　本発明は、このような事情に鑑みてなされたものであって、アキュムレータと圧縮機との間を接続する油戻し配管の応力を低減する圧縮機ユニット及びこれを備えた室外機を提供することを目的とする。 The present invention has been made in view of such circumstances, and provides a compressor unit that reduces the stress of oil return piping connecting an accumulator and a compressor, and an outdoor unit provided with the same. With the goal.
　上記課題を解決するために、本発明の圧縮機ユニット及びこれを備えた室外機は以下の手段を採用する。
　すなわち、本発明の一態様にかかる圧縮機ユニットは、冷媒を圧縮する圧縮機と、該圧縮機へ導かれる冷媒を気液分離するアキュムレータと、前記圧縮機と前記アキュムレータとの間に設けられ、該アキュムレータにて分離されたガス冷媒を前記圧縮機へ導く吸入配管と、前記アキュムレータの底部と前記吸入配管との間に接続された油戻し配管と、該油戻し配管の途中位置に設けられ、巻線形状とされたキャピラリ部と、前記キャピラリ部の下方の前記油戻し配管を前記アキュムレータに対して固定する固定ブラケットとを備えている。 In order to solve the said subject, the compressor unit of this invention and the outdoor unit provided with this employ | adopt the following means.
That is, a compressor unit according to one aspect of the present invention is provided between a compressor that compresses a refrigerant, an accumulator that separates the refrigerant introduced to the compressor from gas to liquid, and the compressor and the accumulator. A suction pipe for guiding the gas refrigerant separated by the accumulator to the compressor, an oil return pipe connected between the bottom of the accumulator and the suction pipe, and a middle position of the oil return pipe, The capillary unit has a winding shape, and a fixing bracket that fixes the oil return pipe below the capillary unit to the accumulator.
　アキュムレータで分離された液冷媒は、潤滑油とともに油戻し配管を通り吸入配管へと導かれ、圧縮機へと戻される。
　圧縮機の振動は、吸入配管を介して、油戻し配管に伝達される。油戻し配管には、巻線形状とされたキャピラリ部が設けられているので、重量物となるキャピラリ部が大きく振動してキャピラリ部周りの配管の応力を増大させるおそれがある。
　そこで、キャピラリ部の下方の油戻し配管をアキュムレータに固定する固定ブラケットを設けた。これにより、キャピラリ部の振動を抑制することができ、油戻し配管の応力を低減することができる。 The liquid refrigerant separated by the accumulator is led to the suction pipe through the oil return pipe together with the lubricating oil, and is returned to the compressor.
Vibration of the compressor is transmitted to the oil return pipe via the suction pipe. Since the oil return pipe is provided with a capillary portion having a winding shape, there is a possibility that the capillary portion which is a heavy load vibrates largely and the stress of the pipe around the capillary portion is increased.
Therefore, a fixing bracket for fixing the oil return pipe below the capillary portion to the accumulator was provided. Thereby, the vibration of the capillary portion can be suppressed, and the stress of the oil return pipe can be reduced.
　さらに、本発明の一態様に係る圧縮機ユニットでは、前記キャピラリ部の下方の前記油戻し配管には、折曲げ部が形成されており、該折曲げ部の下方に前記固定ブラケットが設けられている。 Furthermore, in the compressor unit according to one aspect of the present invention, a bent portion is formed in the oil return pipe below the capillary portion, and the fixed bracket is provided below the bent portion. There is.
　キャピラリ部の下方の油戻し配管に折曲げ部が形成されている場合には、折曲げ部に応力が集中する。そこで、固定ブラケットを折曲げ部の下方に設けることで、折曲げ部に生じる振動を抑え、配管応力を低減することができる。 When a bent portion is formed in the oil return pipe below the capillary portion, stress concentrates on the bent portion. Then, the vibration which arises in a bending part can be suppressed by providing a fixing bracket below the bending part, and piping stress can be reduced.
　さらに、本発明の一態様に係る圧縮機ユニットでは、前記アキュムレータは、略半球形状とされた底部と、該底部の上方に接続された円筒部とを備え、前記固定ブラケットは、前記円筒部の下端に固定されている。 Furthermore, in the compressor unit according to one aspect of the present invention, the accumulator includes a substantially hemispherical bottom portion and a cylindrical portion connected to the upper side of the bottom portion, and the fixing bracket is the cylindrical portion It is fixed to the lower end.
　アキュムレータは、略半球形状の底部と、この底部に接続された円筒部とを備えている。固定ブラケットを溶接等によってアキュムレータに固定する場合、底部は略半球形状とされているため施工が困難となる。そこで、固定ブラケットを円筒部に固定することとした。
　また、固定ブラケットを円筒部の下端に固定することで、キャピラリ部から下方に離れた位置で油戻し配管を固定することができる。これにより、キャピラリ部周りの配管応力を低減することができる。 The accumulator has a substantially hemispherical bottom and a cylinder connected to the bottom. When the fixing bracket is fixed to the accumulator by welding or the like, the bottom portion has a substantially hemispherical shape, which makes installation difficult. Therefore, the fixing bracket is fixed to the cylindrical portion.
Further, by fixing the fixing bracket to the lower end of the cylindrical portion, the oil return pipe can be fixed at a position away from the capillary portion. Thereby, piping stress around the capillary portion can be reduced.
　さらに、本発明の一態様に係る圧縮機ユニットでは、前記固定ブラケットの一端が前記アキュムレータに固定されたアキュムレータ側固定位置よりも、前記固定ブラケットの他端が前記油戻し配管に固定された油戻し配管側固定位置の方が低い位置に設けられている。 Furthermore, in the compressor unit according to one aspect of the present invention, the oil return in which the other end of the fixed bracket is fixed to the oil return pipe than the accumulator side fixed position in which one end of the fixed bracket is fixed to the accumulator. The piping side fixed position is provided at a lower position.
　固定ブラケットの一端がアキュムレータに固定されたアキュムレータ側固定位置よりも、固定ブラケットの他端が油戻し配管に固定された油戻し配管側固定位置の方が低い位置とされている。これにより、キャピラリ部から油戻し配管側固定位置までの距離を大きくすることで、キャピラリ部の下方の油戻し配管に生じる応力を低減することができる。 The oil return pipe side fixing position in which the other end of the fixing bracket is fixed to the oil return pipe is lower than the accumulator side fixing position in which one end of the fixing bracket is fixed to the accumulator. Thus, by increasing the distance from the capillary portion to the oil return pipe side fixing position, it is possible to reduce the stress generated in the oil return pipe below the capillary portion.
　また、本発明の一態様に係る室外機は、上記の圧縮機ユニットと、該圧縮機ユニットを収容する筐体とを備えている。 Moreover, the outdoor unit which concerns on 1 aspect of this invention is equipped with said compressor unit and the housing | casing which accommodates this compressor unit.
　アキュムレータと圧縮機との間を接続する油戻し配管の振動を固定ブラケットによって抑制することで、配管応力を低減することができる。 Piping stress can be reduced by suppressing the vibration of the oil return pipe connecting between the accumulator and the compressor by the fixed bracket.
本発明の第１実施形態に係る空調機の冷媒回路を示した図である。It is the figure which showed the refrigerant circuit of the air conditioner concerning 1st Embodiment of this invention. 第１実施形態に係る圧縮機ユニットの側面図である。It is a side view of a compressor unit concerning a 1st embodiment. 第２実施形態に係る圧縮機ユニットの側面図である。It is a side view of the compressor unit concerning a 2nd embodiment.
　以下に、本発明にかかる一実施形態について、図面を参照して説明する。
［第１実施形態］
　図１には、１台の室外機に対して複数台の室内機が接続されるマルチ形空調システムの冷媒回路図が示されている。なお、室外機は複数台であっても良い。 Hereinafter, an embodiment according to the present invention will be described with reference to the drawings.
First Embodiment
FIG. 1 shows a refrigerant circuit diagram of a multi-type air conditioning system in which a plurality of indoor units are connected to one outdoor unit. Note that there may be a plurality of outdoor units.
　同図に示すように、マルチ形空調システム１は、１台の室外機２に、複数台の室内機３Ａ，３Ｂが並列に接続されたものである。複数台の室内機３Ａ，３Ｂは、室外機２に接続されているガス側配管４と液側配管５との間に分岐器６を介して互いに並列に接続されている。 As shown in the figure, in the multi-type air conditioning system 1, a plurality of indoor units 3A and 3B are connected in parallel to one outdoor unit 2. The plurality of indoor units 3A, 3B are connected in parallel with each other between the gas side pipe 4 connected to the outdoor unit 2 and the liquid side pipe 5 via the branching unit 6.
　室外機２は、冷媒を圧縮するインバータ駆動の圧縮機１０と、冷媒の循環方向を切換える四方切換弁１２と、冷媒と外気とを熱交換させる室外熱交換器１３と、室外熱交換器１３と一体的に構成されている過冷却コイル１４と、室外膨張弁（ＥＥＶＨ）１５と、液冷媒を貯留するレシーバ１６と、液冷媒に過冷却を与える過冷却熱交換器１７と、過冷却熱交換器１７に分流される冷媒量を制御する過冷却用膨張弁（ＥＥＶＳＣ）１８と、圧縮機１０に吸入される冷媒ガスから液分を分離し、ガス分のみを圧縮機１０側に吸入させるアキュムレータ１９と、ガス側操作弁２０と、液側操作弁２１とを備えている。 The outdoor unit 2 includes an inverter-driven compressor 10 for compressing a refrigerant, a four-way switching valve 12 for switching the circulation direction of the refrigerant, an outdoor heat exchanger 13 for heat exchange between the refrigerant and the outside air, and an outdoor heat exchanger 13 A supercooling coil 14 integrally formed, an outdoor expansion valve (EEVH) 15, a receiver 16 for storing liquid refrigerant, a subcooling heat exchanger 17 for supercooling the liquid refrigerant, and supercooling heat exchange Supercooling expansion valve (EEVSC) 18 that controls the amount of refrigerant that is diverted to the compressor 17 and an accumulator that separates the liquid from the refrigerant gas that is sucked into the compressor 10 and that only the gas is sucked into the compressor 10 A gas side operation valve 20 and a liquid side operation valve 21 are provided.
　圧縮機１０は、１３０ｒｐｓを超えて２００ｒｐｓまで回転可能となっている。圧縮機１０の吐出側には、吐出配管２５を介してオイルセパレータ２６が接続されている。オイルセパレータ２６では、圧縮冷媒中のミスト状の潤滑油（オイル）が冷媒から分離される。オイルセパレータ２６でミスト状潤滑油が分離された冷媒は、四方切換弁１２へと導かれる。 The compressor 10 can rotate to over 200 rps over 130 rps. An oil separator 26 is connected to the discharge side of the compressor 10 via a discharge pipe 25. In the oil separator 26, misty lubricating oil (oil) in the compressed refrigerant is separated from the refrigerant. The refrigerant from which the misty lubricating oil has been separated by the oil separator 26 is led to the four-way switching valve 12.
　アキュムレータ１９には、吸入配管３４にアキュムレータ１９で分離された液冷媒を潤滑油とともに戻す油戻し配管３５が設けられている。油戻し配管３５には、キャピラリ部３６が設けられている。キャピラリ部３６は、固定絞りとして用いられ、通過する液冷媒及び潤滑油の圧力を減少させる。 The accumulator 19 is provided with an oil return pipe 35 for returning the liquid refrigerant separated by the accumulator 19 to the suction pipe 34 together with the lubricating oil. The oil return pipe 35 is provided with a capillary portion 36. The capillary portion 36 is used as a fixed throttle to reduce the pressure of the passing liquid refrigerant and lubricating oil.
　室外機２側の上記各機器は、冷媒配管２２を介して順次接続され、公知の室外側冷媒回路２３を構成している。また、室外機２には、室外熱交換器１３に対して外気を送風する室外ファン２４が設けられている。 The above-described devices on the outdoor unit 2 side are sequentially connected via the refrigerant pipe 22 to constitute a known outdoor-side refrigerant circuit 23. Further, the outdoor unit 2 is provided with an outdoor fan 24 for blowing the outside air to the outdoor heat exchanger 13.
　ガス側配管４及び液側配管５は、室外機２のガス側操作弁２０及び液側操作弁２１に接続される冷媒配管であり、現場での据え付け施工時に、室外機２とそれに接続される複数台の室内機３Ａ，３Ｂとの間の距離に応じて、その配管長が適宜設定されるようになっている。ガス側配管４及び液側配管５の途中には、複数の分岐器６が設けられ、該分岐器６を介して適宜台数の室内機３Ａ，３Ｂが接続されている。これによって、密閉された１系統の冷凍サイクル（冷媒回路）７が構成されている。 The gas side pipe 4 and the liquid side pipe 5 are refrigerant pipes connected to the gas side operation valve 20 and the liquid side operation valve 21 of the outdoor unit 2, and are connected to the outdoor unit 2 at the time of installation and construction at the site The pipe length is appropriately set in accordance with the distance between the plurality of indoor units 3A and 3B. A plurality of branching devices 6 are provided in the middle of the gas side piping 4 and the liquid side piping 5, and an appropriate number of indoor units 3A and 3B are connected via the branching devices 6. Thus, a closed refrigeration cycle (refrigerant circuit) 7 is configured.
　室内機３Ａ，３Ｂは、室内空気を冷媒と熱交換させて冷却又は加熱し、室内の空調に供する室内熱交換器３０と、室内膨張弁（ＥＥＶＣ）３１と、室内熱交換器３０を介して室内空気を循環させる室内ファン３２と、室内コントローラ３３とを備えており、室内側の分岐ガス側配管４Ａ，４Ｂ及び分岐液側配管５Ａ，５Ｂを介して分岐器６に接続されている。 The indoor units 3A and 3B heat exchange the indoor air with the refrigerant, cool or heat them, and provide the indoor air conditioning with the indoor heat exchanger 30, the indoor expansion valve (EEVC) 31, and the indoor heat exchanger 30. An indoor fan 32 for circulating indoor air and an indoor controller 33 are provided, and are connected to the branching unit 6 via the branch gas side pipes 4A, 4B and the branch liquid side pipes 5A, 5B on the indoor side.
　上記のマルチ形空調システム１において、冷房運転は、以下のように行われる。
　圧縮機１０で圧縮され、吐出された高温高圧の冷媒ガスは、四方切換弁１２により室外熱交換器１３側に循環され、室外熱交換器１３で室外ファン２４により送風される外気と熱交換されて凝縮液化される。この液冷媒は、過冷却コイル１４で更に冷却された後、室外膨張弁１５を通過し、レシーバ１６内にいったん貯留される。 In the multi-type air conditioning system 1 described above, the cooling operation is performed as follows.
The high-temperature, high-pressure refrigerant gas compressed and discharged by the compressor 10 is circulated to the outdoor heat exchanger 13 by the four-way switching valve 12 and is heat exchanged with the outside air blown by the outdoor fan 24 by the outdoor heat exchanger 13 It is condensed and liquefied. The liquid refrigerant is further cooled by the subcooling coil 14, passes through the outdoor expansion valve 15, and is temporarily stored in the receiver 16.
　レシーバ１６で循環量が調整された液冷媒は、過冷却熱交換器１７を経て液冷媒配管側を流通される過程で、液冷媒配管から一部分流され、過冷却用膨張弁１８で断熱膨張された冷媒と熱交換されて過冷却度が付与される。この液冷媒は、液側操作弁２１を経て室外機２から液側配管５へと導かれ、分岐器６を介して各室内機３Ａ，３Ｂの分岐液側配管５Ａ，５Ｂへと分流される。 The liquid refrigerant whose circulation amount has been adjusted by the receiver 16 is partially flowed from the liquid refrigerant piping in the process of being circulated through the liquid refrigerant piping side through the subcooling heat exchanger 17 and adiabatically expanded by the subcooling expansion valve 18 The heat is exchanged with the refrigerant to give a degree of subcooling. The liquid refrigerant is led from the outdoor unit 2 to the liquid side pipe 5 through the liquid side operation valve 21 and is branched to the branched liquid side pipes 5A, 5B of the indoor units 3A, 3B through the branching unit 6. .
　分岐液側配管５Ａ，５Ｂに分流された液冷媒は、各室内機３Ａ，３Ｂに流入し、室内膨張弁３１で断熱膨張され、気液二相流となって室内熱交換器３０に流入される。室内熱交換器３０では、室内ファン３２により循環される室内空気と冷媒とが熱交換され、室内空気は冷却されて室内の冷房に供される。一方、冷媒はガス化され、分岐ガス側配管４Ａ，４Ｂを経て分岐器６に至り、他の室内機からの冷媒ガスとガス側配管４で合流される。 The liquid refrigerant divided into the branched liquid side pipes 5A, 5B flows into the indoor units 3A, 3B, is adiabatically expanded by the indoor expansion valve 31, and flows into the indoor heat exchanger 30 as a gas-liquid two-phase flow. Ru. In the indoor heat exchanger 30, the indoor air and the refrigerant circulated by the indoor fan 32 exchange heat, and the indoor air is cooled and provided for indoor cooling. On the other hand, the refrigerant is gasified, passes through the branch gas side pipes 4A, 4B, and reaches the branch 6, and is merged with the refrigerant gas from other indoor units by the gas side pipe 4.
　ガス側配管４で合流された冷媒ガスは、再び室外機２に戻り、ガス側操作弁２０、四方切換弁１２を経て、過冷却熱交換器１７からの冷媒ガスと合流された後、アキュムレータ１９に導入される。アキュムレータ１９では、冷媒ガス中に含まれている液分が分離され、ガス分のみが圧縮機１０に吸入される。この冷媒は、圧縮機１０において再び圧縮され、以上のサイクルを繰り返すことによって冷房運転が行われる。アキュムレータ１９で分離された液冷媒は、アキュムレータ１９の底部に貯留され、潤滑油とともに油戻し配管３５を介して吸入配管３４へと導かれる。 The refrigerant gas joined in the gas side pipe 4 is returned to the outdoor unit 2 again, passes through the gas side operation valve 20 and the four-way switching valve 12 and is joined with the refrigerant gas from the subcooling heat exchanger 17. Introduced to In the accumulator 19, the liquid contained in the refrigerant gas is separated, and only the gas is drawn into the compressor 10. The refrigerant is compressed again in the compressor 10, and the cooling operation is performed by repeating the above cycle. The liquid refrigerant separated by the accumulator 19 is stored at the bottom of the accumulator 19 and is led to the suction pipe 34 via the oil return pipe 35 together with the lubricating oil.
　一方、暖房運転は、以下のように行われる。
　圧縮機１０により圧縮され、吐出された高温高圧の冷媒ガスは、四方切換弁１２を介してガス側操作弁２０側に循環される。この高圧ガス冷媒は、ガス側操作弁２０、ガス側配管４を経て室外機２から導出され、分岐器６、室内側の分岐ガス側配管４Ａ，４Ｂを経て複数台の室内機３Ａ，３Ｂに導入される。 On the other hand, the heating operation is performed as follows.
The high-temperature, high-pressure refrigerant gas compressed and discharged by the compressor 10 is circulated to the gas-side operation valve 20 via the four-way switching valve 12. The high pressure gas refrigerant is led from the outdoor unit 2 through the gas side operation valve 20 and the gas side pipe 4 and passes through the branching unit 6 and the branch gas side pipes 4A and 4B on the indoor side to a plurality of indoor units 3A and 3B. be introduced.
　室内機３Ａ，３Ｂに導入された高温高圧の冷媒ガスは、室内熱交換器３０で室内ファン３２を介して循環される室内空気と熱交換され、これにより加熱された室内空気は室内に吹出されて暖房に供される。一方、室内熱交換器３０で凝縮液化された冷媒は、室内膨張弁３１、分岐液側配管５Ａ，５Ｂを経て分岐器６に至り、他の室内機からの冷媒と合流され、液側配管５を経て室外機２に戻る。なお、暖房時、室内機３Ａ，３Ｂでは、凝縮器として機能する室内熱交換器３０の冷媒出口温度又は冷媒過冷却度が制御目標値となるように、室内膨張弁３１の開度が室内コントローラ３３を介して制御される。 The high temperature / high pressure refrigerant gas introduced into the indoor units 3A, 3B is heat exchanged with the indoor air circulated through the indoor fan 32 by the indoor heat exchanger 30, and the indoor air heated by this is blown out into the room It is served for heating. On the other hand, the refrigerant condensed and liquefied by the indoor heat exchanger 30 passes through the indoor expansion valve 31 and the branch liquid side pipes 5A and 5B to reach the branch 6, and is merged with the refrigerant from the other indoor units. And return to the outdoor unit 2. During heating, in the indoor units 3A and 3B, the degree of opening of the indoor expansion valve 31 is the indoor controller so that the refrigerant outlet temperature or the degree of refrigerant supercooling of the indoor heat exchanger 30 functioning as a condenser becomes the control target value. It is controlled via 33.
　室外機２に戻った冷媒は、液側操作弁２１を経て過冷却熱交換器１７に至り、冷房時の場合と同様に過冷却が付与された後、レシーバ１６に流入され、いったん貯留されることにより循環量が調整される。この液冷媒は、室外膨張弁１５に供給されて断熱膨張された後、過冷却コイル１４を経て室外熱交換器１３に流入される。 The refrigerant returned to the outdoor unit 2 passes through the liquid side operation valve 21 to reach the subcooling heat exchanger 17, and after being subcooled as in the case of cooling, flows into the receiver 16 and is temporarily stored. Thus, the circulation amount is adjusted. The liquid refrigerant is supplied to the outdoor expansion valve 15 and adiabatically expanded, and then flows into the outdoor heat exchanger 13 through the subcooling coil 14.
　室外熱交換器１３では、室外ファン２４から送風される外気と冷媒とが熱交換され、冷媒は外気から吸熱して蒸発ガス化される。この冷媒は、室外熱交換器１３から四方切換弁１２を経て、過冷却熱交換器１７からの冷媒ガスと合流された後、アキュムレータ１９に導入される。アキュムレータ１９では、冷媒ガス中に含まれている液分が分離されてガス分のみが圧縮機１０に吸入され、圧縮機１０において再び圧縮される。以上のサイクルを繰り返すことによって暖房運転が行われる。アキュムレータ１９で分離された液冷媒は、アキュムレータ１９の底部に貯留され、潤滑油とともに油戻し配管３５を介して吸入配管３４へと導かれる。 In the outdoor heat exchanger 13, the refrigerant exchanges heat with the outside air blown from the outdoor fan 24, and the refrigerant absorbs heat from the outside air to be vaporized and gasified. The refrigerant is introduced from the outdoor heat exchanger 13 through the four-way switching valve 12 to the refrigerant gas from the subcooling heat exchanger 17 and then introduced into the accumulator 19. In the accumulator 19, the liquid contained in the refrigerant gas is separated, and only the gas is drawn into the compressor 10 and compressed again in the compressor 10. The heating operation is performed by repeating the above cycle. The liquid refrigerant separated by the accumulator 19 is stored at the bottom of the accumulator 19 and is led to the suction pipe 34 via the oil return pipe 35 together with the lubricating oil.
＜圧縮機ユニットの構造＞
　図２には、室外機２の筐体内に設置された圧縮機１０とアキュムレータ１９を備えた圧縮機ユニットの構造が示されている。 <Structure of compressor unit>
The structure of the compressor unit provided with the compressor 10 and the accumulator 19 which were installed in the housing | casing of the outdoor unit 2 by FIG. 2 is shown.
　圧縮機１０は、鉛直方向に延在する軸線を有する略円筒形状とされている。圧縮機１０の下部には電動モータ（図示せず）が収容され、上部にはスクロール部等の圧縮機構（図示せず）が収納されている。 The compressor 10 has a substantially cylindrical shape having an axis extending in the vertical direction. An electric motor (not shown) is accommodated in the lower portion of the compressor 10, and a compression mechanism (not shown) such as a scroll portion is accommodated in the upper portion.
　アキュムレータ１９は、鉛直方向に軸線を有して立設され、略半球形状の底部１９ａと、略半球形状の上部１９ｂと、これら底部１９ａ及び上部１９ｂに挟まれた円筒部１９ｃとから形成された繭形状とされている。アキュムレータ１９は、脚部１９ｄを介して図示しない底板に固定されている。 The accumulator 19 is erected with an axis in the vertical direction, and is formed of a substantially hemispherical bottom 19a, a substantially hemispherical top 19b, and a cylindrical portion 19c sandwiched between the bottom 19a and the top 19b. It has a bowl shape. The accumulator 19 is fixed to a bottom plate (not shown) via the legs 19 d.
　アキュムレータ１９の頂部には、吸入配管３４の上流端３４ａが接続されている。吸入配管３４の下流端３４ｂは、圧縮機１０に接続されている。吸入配管３４は、アキュムレータ１９の頂部から上方に立ち上がった後に、側方へ延在し、さらに下方へ曲げられ、下方の折返し部３４ｃにてＵ字状に折り返した後に、再び上方へ立ち上げられる。そして、吸入配管３４は、上方に立ち上げられた後に、側方へと延在し、再び下方へ立ち下げられ、最終的に圧縮機１０の側部に接続されている。 The upstream end 34 a of the suction pipe 34 is connected to the top of the accumulator 19. The downstream end 34 b of the suction pipe 34 is connected to the compressor 10. After rising from the top of the accumulator 19, the suction pipe 34 extends laterally and is further bent downward, and after being folded in a U-shape at the lower turnback portion 34c, is raised again upward. . Then, after the suction pipe 34 is raised upward, it extends laterally, is lowered again again, and is finally connected to the side of the compressor 10.
　油戻し配管３５は、アキュムレータ１９と吸入配管３４との間に設けられ、ステンレスや銅合金等の金属製の配管とされている。油戻し配管３５の上流端３５ａは、アキュムレータ１９の底部１９ａの下端に接続されている。油戻し配管３５の下流端３５ｂは、吸入配管３４の下方の折返し部３４ｃの近傍で、かつ圧縮機１０の高さの中間位置に接続されている。 The oil return pipe 35 is provided between the accumulator 19 and the suction pipe 34, and is a pipe made of metal such as stainless steel or copper alloy. The upstream end 35 a of the oil return pipe 35 is connected to the lower end of the bottom 19 a of the accumulator 19. The downstream end 35 b of the oil return pipe 35 is connected to a position near the folded portion 34 c below the suction pipe 34 and at an intermediate position of the height of the compressor 10.
　キャピラリ部３６は、油戻し配管３５の途中位置に設けられ、油戻し配管３５の配管径よりも小さい配管径を有する細管を複数回巻回した巻線形状とされている。キャピラリ部３６は、油戻し配管３５の下流端３５ｂの近傍で、かつ下流端３５ｂと略同じ高さ位置に設けられている。 The capillary portion 36 is provided at an intermediate position of the oil return pipe 35, and has a winding shape in which a thin tube having a pipe diameter smaller than the pipe diameter of the oil return pipe 35 is wound a plurality of times. The capillary portion 36 is provided near the downstream end 35 b of the oil return pipe 35 and at substantially the same height position as the downstream end 35 b.
　キャピラリ部３６の上流側（図２において左側）に接続された油戻し配管３５は、折曲げ部３５ｃで略Ｌ字状に折り曲げられた後に略鉛直方向に下方へ延在する鉛直部３５ｄを有している。この鉛直部３５ｄに対して、固定ブラケット３７が固定されている。 The oil return pipe 35 connected to the upstream side (left side in FIG. 2) of the capillary portion 36 has a vertical portion 35 d extending downward in a substantially vertical direction after being bent in a substantially L shape at the bending portion 35 c doing. The fixing bracket 37 is fixed to the vertical portion 35d.
　固定ブラケット３７は、所定の形状に成形された板金とされている。固定ブラケット３７のアキュムレータ側固定位置３７ａは、アキュムレータ１９の円筒部１９ｃの下端の側部に対して溶接により設けられている。固定ブラケットは、アキュムレータ側固定位置３７ａを起点として水平方向に延在している。したがって、固定ブラケット３７の油戻し配管側固定位置３７ｂは、アキュムレータ側固定位置３７ａと同じ高さ位置となり、キャピラリ部３６及び折曲げ部３５ｃよりも下方に設けられている。 The fixing bracket 37 is a sheet metal formed into a predetermined shape. The accumulator side fixed position 37 a of the fixed bracket 37 is provided by welding to the side portion of the lower end of the cylindrical portion 19 c of the accumulator 19. The fixed bracket extends in the horizontal direction starting from the accumulator side fixed position 37a. Therefore, the oil return piping side fixing position 37b of the fixing bracket 37 is at the same height position as the accumulator side fixing position 37a, and is provided below the capillary portion 36 and the bending portion 35c.
　本実施形態によれば、以下の作用効果を奏する。
　圧縮機１０の振動は、吸入配管３４を介して、油戻し配管３５に伝達される。油戻し配管３５には、巻線形状とされたキャピラリ部３６が設けられているので、重量物となるキャピラリ部３６が大きく振動してキャピラリ部３６周りの配管の応力を増大させるおそれがある。これに対して、本実施形態では、キャピラリ部３６の下方の油戻し配管３５の鉛直部３５ｄをアキュムレータ１９に固定する固定ブラケット３７を設けた。これにより、キャピラリ部３６の振動を抑制することができ、油戻し配管３５の応力を低減することができる。 According to the present embodiment, the following effects are achieved.
The vibration of the compressor 10 is transmitted to the oil return pipe 35 via the suction pipe 34. Since the oil return pipe 35 is provided with the capillary portion 36 having a winding shape, there is a possibility that the capillary portion 36 serving as a heavy object vibrates largely and the stress of the pipe around the capillary portion 36 is increased. On the other hand, in the present embodiment, the fixing bracket 37 for fixing the vertical portion 35 d of the oil return pipe 35 below the capillary portion 36 to the accumulator 19 is provided. Thereby, the vibration of the capillary portion 36 can be suppressed, and the stress of the oil return pipe 35 can be reduced.
　キャピラリ部３６の下方の油戻し配管３５に折曲げ部３５ｃが形成されているため、折曲げ部３５ｃに応力が集中する。そこで、固定ブラケット３７を折曲げ部３５ｃの下方に設けることで、折曲げ部３５ｃに生じる振動を抑え、配管応力を低減することができる。 Since the bent portion 35c is formed in the oil return pipe 35 below the capillary portion 36, stress concentrates on the bent portion 35c. Therefore, by providing the fixing bracket 37 below the bent portion 35c, it is possible to suppress the vibration generated in the bent portion 35c and reduce the piping stress.
　固定ブラケットを溶接等によってアキュムレータ１９の底部１９ａに固定する場合、底部１９ａは略半球形状とされているため施工が困難となる。そこで、本実施形態では、固定ブラケット３７をアキュムレータ１９の円筒部１９ｃに固定することとした。
　また、固定ブラケット３７を円筒部１９ｃの下端に固定することで、キャピラリ部３６から下方に離れた油戻し配管側固定位置３７ｂで油戻し配管３５を固定することができる。これにより、キャピラリ部３６周りの配管に生じる応力を低減することができる。 When the fixing bracket is fixed to the bottom 19a of the accumulator 19 by welding or the like, the bottom 19a has a substantially hemispherical shape, which makes installation difficult. Therefore, in the present embodiment, the fixing bracket 37 is fixed to the cylindrical portion 19 c of the accumulator 19.
In addition, by fixing the fixing bracket 37 to the lower end of the cylindrical portion 19c, the oil return pipe 35 can be fixed at the oil return pipe side fixing position 37b separated downward from the capillary portion 36. Thereby, the stress generated in the piping around the capillary portion 36 can be reduced.
［第２実施形態］
　次に、本発明の第２実施形態について図３を用いて説明する。本実施形態は、第１実施形態に対して固定ブラケットの構成が異なるだけで、他の構成については同様である。したがって、第１実施形態と同様の構成については同一符号を付しその説明を省略し、相違点のみを説明する。 Second Embodiment
Next, a second embodiment of the present invention will be described with reference to FIG. The present embodiment is the same as the first embodiment except for the configuration of the fixing bracket and the other configurations. Therefore, the same components as those in the first embodiment are given the same reference numerals, and descriptions thereof will be omitted, and only differences will be described.
　固定ブラケット３８は、両端の固定位置の高さを異ならせるように上下方向に屈曲された形状となっている。すなわち、固定ブラケット３８のアキュムレータ側固定位置３８ａは、第１実施形態と同様にアキュムレータ１９の円筒部１９ｃの下端に設けられている一方で、固定ブラケット３８の油戻し配管側固定位置３８ｂは、アキュムレータ側固定位置３８ａよりも下方に設けられている。これにより、キャピラリ部３６から油戻し配管側固定位置３８ｂまでの距離を大きくすることで、キャピラリ部３６の下方の油戻し配管３５に生じる応力をさらに低減することができる。 The fixing bracket 38 has a shape bent in the vertical direction so as to make the heights of the fixing positions of the both ends different. That is, the accumulator side fixed position 38a of the fixed bracket 38 is provided at the lower end of the cylindrical portion 19c of the accumulator 19 as in the first embodiment, while the oil return piping side fixed position 38b of the fixed bracket 38 is an accumulator It is provided below the side fixed position 38a. Thus, by increasing the distance from the capillary portion 36 to the oil return pipe side fixing position 38b, the stress generated in the oil return pipe 35 below the capillary portion 36 can be further reduced.
　なお、上述した各実施形態では、１３０ｒｐｓを超えて２００ｒｐｓまで回転可能な圧縮機１０として説明したが、本発明はこれに限定されるものではなく、１３０ｒｐｓ以下の圧縮機回転数であってもよく、また２００ｒｐｓを超える圧縮機回転数であっても良い。 In each embodiment mentioned above, although it explained as compressor 10 which can be rotated to 200 rps more than 130 rps, the present invention is not limited to this, The number of compressor rotations of 130 rps or less may be sufficient. Also, the compressor rotational speed may exceed 200 rps.
１　マルチ形空調システム
２　室外機
３Ａ，３Ｂ　室内機
１０　圧縮機
１３　室外熱交換器
１９　アキュムレータ
１９ａ　底部
１９ｂ　上部
１９ｃ　円筒部
１９ｄ　脚部
３４　吸入配管
３４ａ　上流端
３４ｂ　下流端
３４ｃ　折返し部
３５　油戻し配管
３５ａ　上流端
３５ｂ　下流端
３５ｃ　折曲げ部
３５ｄ　鉛直部
３６　キャピラリ部
３７　固定ブラケット
３７ａ　アキュムレータ側固定位置
３７ｂ　油戻し配管側固定位置
３８　固定ブラケット
３８ａ　アキュムレータ側固定位置
３８ｂ　油戻し配管側固定位置 DESCRIPTION OF SYMBOLS 1 multi type air conditioning system 2 outdoor unit 3A, 3B indoor unit 10 compressor 13 outdoor heat exchanger 19 accumulator 19a bottom 19b upper part 19b cylindrical part 19d cylindrical part 34 suction piping 34a upstream end 34b downstream end 34c folded part 35 oil return piping 35a Upstream end 35b Downstream end 35c Bent part 35d Vertical part 36 Capillary part 37 Fixing bracket 37a Accumulator side fixing position 37b Oil return piping side fixing position 38 Fixing bracket 38a Accumulator side fixing position 38b Oil return piping side fixing position

Claims (5)

  1. 　冷媒を圧縮する圧縮機と、
    　該圧縮機へ導かれる冷媒を気液分離するアキュムレータと、
    　前記圧縮機と前記アキュムレータとの間に設けられ、該アキュムレータにて分離されたガス冷媒を前記圧縮機へ導く吸入配管と、
    　前記アキュムレータの底部と前記吸入配管との間に接続された油戻し配管と、
    　該油戻し配管の途中位置に設けられ、巻線形状とされたキャピラリ部と、
    　前記キャピラリ部の下方の前記油戻し配管を前記アキュムレータに対して固定する固定ブラケットと、
    を備えている圧縮機ユニット。     A compressor for compressing a refrigerant,
    An accumulator for vapor-liquid separation of the refrigerant introduced to the compressor;
    A suction pipe provided between the compressor and the accumulator for guiding the gas refrigerant separated by the accumulator to the compressor;
    An oil return pipe connected between the bottom of the accumulator and the suction pipe;
    A capillary portion provided at an intermediate position of the oil return pipe and having a winding shape;
    A fixing bracket for fixing the oil return pipe below the capillary section to the accumulator;
    Compressor unit equipped with.
  2. 　前記キャピラリ部の下方の前記油戻し配管には、折曲げ部が形成されており、
    　該折曲げ部の下方に前記固定ブラケットが設けられている請求項１に記載の圧縮機ユニット。     A bent portion is formed on the oil return pipe below the capillary portion,
    The compressor unit according to claim 1, wherein the fixing bracket is provided below the bent portion.
  3. 　前記アキュムレータは、略半球形状とされた底部と、該底部の上方に接続された円筒部とを備え、
    　前記固定ブラケットは、前記円筒部の下端に固定されている請求項１又は２に記載の圧縮機ユニット。     The accumulator includes a substantially hemispherical bottom, and a cylindrical portion connected to the upper side of the bottom.
    The compressor unit according to claim 1, wherein the fixing bracket is fixed to a lower end of the cylindrical portion.
  4. 　前記固定ブラケットの一端が前記アキュムレータに固定されたアキュムレータ側固定位置よりも、前記固定ブラケットの他端が前記油戻し配管に固定された油戻し配管側固定位置の方が低い位置に設けられている請求項１から３のいずれかに記載の圧縮機ユニット。 The oil return pipe side fixing position in which the other end of the fixing bracket is fixed to the oil return pipe is provided at a lower position than the accumulator side fixing position in which one end of the fixing bracket is fixed to the accumulator The compressor unit according to any one of claims 1 to 3.
  5. 　請求項１から４のいずれかに記載の圧縮機ユニットと、
    　該圧縮機ユニットを収容する筐体と、
    を備えている室外機。     A compressor unit according to any one of claims 1 to 4;
    A housing for accommodating the compressor unit;
    Outdoor unit equipped with.
PCT/JP2017/043384 2016-12-13 2017-12-04 Compressor unit and outdoor unit provided therewith WO2018110331A1 (en)

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JP7214533B2 (en) * 2019-03-29 2023-01-30 三菱重工サーマルシステムズ株式会社 air conditioner
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JP2024011176A (en) * 2022-07-14 2024-01-25 三菱重工業株式会社 Compressor unit and refrigeration system
CN115540178B (en) * 2022-08-18 2024-05-24 青岛海尔空调器有限总公司 Air conditioner control method and air conditioner

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