JP3480778B2 - Multi-type air conditioner - Google Patents

Multi-type air conditioner

Info

Publication number
JP3480778B2
JP3480778B2 JP06297896A JP6297896A JP3480778B2 JP 3480778 B2 JP3480778 B2 JP 3480778B2 JP 06297896 A JP06297896 A JP 06297896A JP 6297896 A JP6297896 A JP 6297896A JP 3480778 B2 JP3480778 B2 JP 3480778B2
Authority
JP
Japan
Prior art keywords
commercial frequency
valve
frequency compressor
compressor
check valve
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 - Fee Related
Application number
JP06297896A
Other languages
Japanese (ja)
Other versions
JPH09250819A (en
Inventor
剛 志 久保田
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.)
Toshiba Carrier Corp
Original Assignee
Toshiba Carrier 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 Toshiba Carrier Corp filed Critical Toshiba Carrier Corp
Priority to JP06297896A priority Critical patent/JP3480778B2/en
Publication of JPH09250819A publication Critical patent/JPH09250819A/en
Application granted granted Critical
Publication of JP3480778B2 publication Critical patent/JP3480778B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

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
    • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/07—Details of compressors or related parts
    • F25B2400/075—Details of compressors or related parts with parallel compressors
    • 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
    • F25B2500/12—Sound
    • 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
    • F25B2500/26—Problems to be solved characterised by the startup of the refrigeration cycle
    • 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
    • F25B2500/27—Problems to be solved characterised by the stop of the refrigeration cycle
    • 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
    • F25B2600/00—Control issues
    • F25B2600/02—Compressor control
    • F25B2600/021—Inverters therefor
    • 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
    • F25B2600/00—Control issues
    • F25B2600/02—Compressor control
    • F25B2600/026—Compressor control by controlling unloaders
    • F25B2600/0261—Compressor control by controlling unloaders external to the compressor
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Landscapes

  • Compression-Type Refrigeration Machines With Reversible Cycles (AREA)

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【発明の属する技術分野】本発明は、互いに並列接続さ
れる複数台の圧縮機が、商用周波数で運転される商用周
波数圧縮機を含み、空調負荷に応じてこの商用周波数圧
縮機の起動、停止を行うマルチ式空気調和装置に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention includes a commercial frequency compressor in which a plurality of compressors connected in parallel to each other operate at a commercial frequency, and the commercial frequency compressor is started or stopped in accordance with an air conditioning load. The present invention relates to a multi-type air conditioner.

【０００２】[0002]

【従来の技術及び発明が解決しようとする課題】近年、
ビル空調システムの大形化に応じて、複数台の圧縮機を
互いに並列に接続して室外機の容量を大きくしているも
のも少なくない。この場合、インバータ装置を用いて圧
縮機を能力制御する、いわゆる、可変周波数圧縮機と、
商用電源周波数でそのまま運転する商用周波数圧縮機と
を並列に接続し、可変周波数圧縮機を常時運転し、空調
負荷に応じて商用周波数圧縮機を起動、停止する構成の
ものがある。2. Description of the Related Art In recent years,
As the size of building air-conditioning systems increases, many compressors are connected in parallel to increase the capacity of the outdoor unit. In this case, a so-called variable frequency compressor, which controls the capacity of the compressor using the inverter device,
There is a configuration in which a commercial frequency compressor that operates as it is at the commercial power frequency is connected in parallel, the variable frequency compressor is constantly operated, and the commercial frequency compressor is started and stopped according to the air conditioning load.

【０００３】商用周波数圧縮機の停止中、又は、停止時
に冷媒が逆流しないように、その吐出側に逆止弁を設け
るのが一般的であり、例えば、１台の可変周波数圧縮機
に複数台の商用周波数圧縮機を並列接続する場合には、
商用周波数圧縮機毎に、それぞれの吐出側に逆止弁が設
けられる。A check valve is generally provided on the discharge side of the commercial frequency compressor so that the refrigerant does not flow backward when the commercial frequency compressor is stopped or when the commercial frequency compressor is stopped. For example, one variable frequency compressor has a plurality of check valves. When connecting commercial frequency compressors in parallel,
A check valve is provided on each discharge side of each commercial frequency compressor.

【０００４】ところで、商用周波数圧縮機を起動、停止
すると、その吐出側に設けられた逆止弁の前後が微差圧
状態になると共に、加圧の方向が頻繁に反転することが
あり、そのため、逆止弁を構成する内部の玉が往復運動
をして「カチカチ」という騒音を発生することがあっ
た。因みに、逆止弁を構成する内部の玉の材質をブチル
ゴム等に変更しても、この騒音の防止、低減の効果は少
ないものであった。By the way, when the commercial frequency compressor is started and stopped, the front and rear of the check valve provided on the discharge side thereof may be in a slightly differential pressure state, and the direction of pressurization may frequently be reversed. In some cases, the internal balls that make up the check valve reciprocate, producing a clicking noise. By the way, even if the material of the internal ball forming the check valve is changed to butyl rubber or the like, the effect of preventing and reducing this noise is small.

【０００５】本発明は上記の事情を考慮してなされたも
ので、圧縮機の起動停止に伴う逆止弁からの騒音の発生
を抑えることのできるマルチ式空気調和装置を提供する
ことを目的とする。The present invention has been made in consideration of the above circumstances, and an object of the present invention is to provide a multi-type air conditioner capable of suppressing the generation of noise from the check valve due to the start and stop of the compressor. To do.

【０００６】[0006]

【課題を解決するための手段】本発明に係るマルチ式空
気調和装置は、商用周波数で運転される商用周波数圧縮
機の吐出側にそれぞれ逆止弁が配設された冷凍サイクル
を備え、空調負荷に応じてこれらの圧縮機を起動、停止
させるに当たり、逆止弁の前後の圧力が頻繁に変動する
と予測される期間、例えば、その起動時及び停止時の少
なくとも一方にて、商用周波数圧縮機の吐出側と逆止弁
との間の配管から商用周波数圧縮機の吸込側配管へ、冷
媒を分流させるバイパス手段を備えているので、圧縮機
の起動停止に伴う逆止弁からの騒音の発生を抑えること
ができる。A multi-type air conditioner according to the present invention is provided with a refrigeration cycle in which check valves are arranged on the discharge side of a commercial frequency compressor operating at a commercial frequency, and an air conditioning load is provided. In starting and stopping these compressors in accordance with the above, a period in which the pressure before and after the check valve is expected to fluctuate frequently, for example, at least one of starting and stopping the commercial frequency compressor Bypass means is provided to divert the refrigerant from the piping between the discharge side and the check valve to the suction side piping of the commercial frequency compressor, so noise from the check valve due to compressor start-up and stop is reduced. Can be suppressed.

【０００７】この場合、バイパス手段は、商用周波数圧
縮機の吐出側配管と吸込側配管との間に接続された開閉
弁と、逆止弁の前後の圧力が頻繁に変動すると予測され
る期間に、開閉弁を開放する弁開閉制御回路とで構成す
ることによって、騒音の発生を確実に抑えることがで
き、さらに、この開閉弁にキャピラリチューブを並列接
続することによって、流量の少ない開閉弁の使用が可能
となる。[0007] In this case, the bypass means is connected to the open / close valve connected between the discharge side pipe and the suction side pipe of the commercial frequency compressor and the pressure before and after the check valve is expected to fluctuate frequently. , And the valve opening / closing control circuit that opens the opening / closing valve can surely suppress the generation of noise, and by connecting a capillary tube in parallel to this opening / closing valve, use of an opening / closing valve with a small flow rate can be achieved. Is possible.

【０００８】なお、バイパス手段として、商用周波数圧
縮機の吐出側配管と吸込側配管との間にキャピラリーチ
ューブのみを接続するだけでも十分な場合があり、この
場合には構成が著しく簡易化される利点がある。In some cases, it may be sufficient to connect only the capillary tube between the discharge side pipe and the suction side pipe of the commercial frequency compressor as the bypass means. In this case, the structure is remarkably simplified. There are advantages.

【０００９】[0009]

【発明の実施の形態】以下、本発明を図面に示す実施形
態に基づいて詳細に説明する。図１は本発明に係るマル
チ式空気調和装置の第１の実施形態の全体構成を示す系
統図である。同図において、１，２はそれぞれ圧縮機ユ
ニットであり、このうち、圧縮機ユニット１はインバー
タ装置によって可変周波数運転する可変周波数圧縮機10
と、商用電源の周波数でそのまま運転する商用周波数圧
縮機11とを一つのケースに収納したものであり、圧縮機
ユニット２は商用電源の周波数でそのまま運転する商用
周波数圧縮機11及び12を一つのケースに収納したもので
ある。これらの圧縮機ユニット１，２は圧縮機相互の油
量をパランスさせるための均油管８で接続されている。BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below in detail based on the embodiments shown in the drawings. FIG. 1 is a system diagram showing an overall configuration of a first embodiment of a multi-type air conditioner according to the present invention. In the figure, reference numerals 1 and 2 denote compressor units, of which the compressor unit 1 is a variable frequency compressor 10 that operates at a variable frequency by an inverter device.
And a commercial frequency compressor 11 that operates at the frequency of the commercial power source are housed in one case. The compressor unit 2 includes the commercial frequency compressors 11 and 12 that operate at the frequency of the commercial power source as they are. It is stored in a case. These compressor units 1 and 2 are connected by an oil equalizing pipe 8 for balancing the oil amount between the compressors.

【００１０】上述した４台の圧縮機のうち、可変周波数
圧縮機10の吐出側はマフラー20を介してオイルセパレー
タ３の入側に接続され、商用周波数圧縮機11はマフラー
21及び逆止弁31を介して同じくオイルセパレータ３の入
側に接続されている。同様に、商用周波数圧縮機12はマ
フラー22及び逆止弁32を介して、商用周波数圧縮機13は
マフラー23及び逆止弁33を介して、それぞれオイルセパ
レータ３の入側に接続されている。逆止弁31〜33はそれ
ぞれ商用周波数圧縮機11〜13の運転休止中に、可変周波
数圧縮機10から吐出されるガス冷媒が逆流することを防
止するものである。Of the four compressors described above, the discharge side of the variable frequency compressor 10 is connected to the inlet side of the oil separator 3 via the muffler 20, and the commercial frequency compressor 11 is the muffler.
It is also connected to the inlet side of the oil separator 3 via 21 and a check valve 31. Similarly, the commercial frequency compressor 12 is connected to the inlet side of the oil separator 3 via the muffler 22 and the check valve 32, and the commercial frequency compressor 13 is connected to the inlet side of the oil separator 3 via the muffler 23 and the check valve 33. The check valves 31 to 33 prevent the gas refrigerant discharged from the variable frequency compressor 10 from flowing backward while the commercial frequency compressors 11 to 13 are stopped.

【００１１】オイルセパレータ３は圧縮機10〜13から吐
出された冷媒ガス中に微粒となって混入される冷凍機油
を分離する容器であり、ここで分離された油はストレー
ナ61及びキャピラリーチューブ71を介して各圧縮機10〜
13に戻されるが、圧縮機ユニット１及び圧縮機ユニット
２の運転状態に応じて戻り量を加減するべく、一端がス
トレーナ61に接続されたキャピラリーチューブ71の他端
は、キャピラリーチューブ72を介して圧縮機ユニット２
の吸込側に接続され、さらに、開閉弁48及びキャピラリ
ーチューブ73の並列接続経路を介して圧縮機ユニット１
の吸込側に接続されている。The oil separator 3 is a container for separating refrigerating machine oil mixed into the refrigerant gas discharged from the compressors 10 to 13 in the form of fine particles, and the separated oil is stored in the strainer 61 and the capillary tube 71. Through each compressor 10 ~
Although it is returned to 13, the other end of the capillary tube 71 whose one end is connected to the strainer 61 is connected via the capillary tube 72 in order to adjust the amount of return depending on the operating states of the compressor unit 1 and the compressor unit 2. Compressor unit 2
Of the compressor unit 1 via the parallel connection path of the on-off valve 48 and the capillary tube 73.
Is connected to the suction side of.

【００１２】オイルセパレータ３の出側、すなわち、冷
凍機油が分離除去されたガス冷媒の出側は四方弁４を通
って、互いに並列接続された室外熱交換器ユニット５，
６に供給される。この室外熱交換器ユニット５，６はそ
れぞれ上段熱交換器と下段熱交換器とでなり、この場合
は凝縮器として作用し、室外熱交換器ユニット５の出側
は膨張弁51及び逆止弁34の並列接続経路を介してリキッ
ドタンク７に接続され、同じく、室外熱交換器ユニット
６の出側も膨張弁52及び逆止弁35の並列接続経路を介し
てリキッドタンク７に接続されている。なお、膨張弁51
及び52は暖房運転時に逆方向に循環するガス冷媒を減圧
させるもので、室外熱交換器ユニット５，６からの液冷
媒は逆止弁34，35を通してそのままリキッドタンク７に
貯えられる。The outlet side of the oil separator 3, that is, the outlet side of the gas refrigerant from which the refrigerating machine oil has been separated and removed, passes through the four-way valve 4 and is connected in parallel to the outdoor heat exchanger units 5, 5.
6 is supplied. Each of the outdoor heat exchanger units 5 and 6 is composed of an upper heat exchanger and a lower heat exchanger. In this case, the outdoor heat exchanger unit 5 functions as a condenser, and the outlet side of the outdoor heat exchanger unit 5 has an expansion valve 51 and a check valve. 34 is connected to the liquid tank 7 via a parallel connection path, and similarly, the outlet side of the outdoor heat exchanger unit 6 is also connected to the liquid tank 7 via a parallel connection path of the expansion valve 52 and the check valve 35. . The expansion valve 51
Reference numerals 52 and 52 reduce the pressure of the gas refrigerant circulating in the opposite direction during the heating operation, and the liquid refrigerant from the outdoor heat exchanger units 5 and 6 is stored in the liquid tank 7 as it is through the check valves 34 and 35.

【００１３】リキッドタンク７に貯えられた液冷媒の大
部分は、ドライヤ62によって冷媒中に溶解する水分を除
去されたのち、バックドバルブ46を介して冷媒用の絞り
手段、室内用熱交換器などを備える室内ユニット81〜84
に供給され、リキッドタンク７に貯えられた液冷媒の一
部は、膨張弁53及び開閉弁49の並列接続経路と、キャピ
ラリーチューブ75，76とでなるクーリングパイパスを介
して、圧縮機ユニット１，２に戻される。Most of the liquid refrigerant stored in the liquid tank 7 has its water content dissolved in the refrigerant removed by the dryer 62, and then the throttle means for the refrigerant and the indoor heat exchanger are passed through the backed valve 46. Indoor units 81-84 equipped with
Part of the liquid refrigerant that is supplied to the liquid tank 7 and is stored in the liquid tank 7 passes through a parallel connecting path of the expansion valve 53 and the opening / closing valve 49, and a cooling pipe path formed of the capillary tubes 75 and 76. Returned to 2.

【００１４】室内ユニット81〜84は室内熱交換器が蒸発
器として作用し、ここで液冷媒がガス冷媒に変換され、
バックドバルブ47を介してストレーナ63に導かれ、ここ
で、異物が除去されたのち、四方弁４を通してアキュム
レータ９に供給される。アキュムレータ９はガス冷媒に
混入する未蒸発液冷媒を捕捉分離し、ガス冷媒のみを圧
縮機ユニット１，２に吸入させるものである。なお、ア
キュムレータ９の入側とオイルセパレータ３の入側との
間に、空気調和装置の停止時に圧縮機の吐出側と吸入側
とを圧力バランスさせて起動に備える開閉弁45が接続さ
れている。In the indoor units 81 to 84, the indoor heat exchanger acts as an evaporator, in which the liquid refrigerant is converted into a gas refrigerant,
It is guided to the strainer 63 via the backed valve 47, where foreign matter is removed and then supplied to the accumulator 9 through the four-way valve 4. The accumulator 9 captures and separates the non-evaporated liquid refrigerant mixed in the gas refrigerant, and sucks only the gas refrigerant into the compressor units 1 and 2. An on-off valve 45 is connected between the inlet side of the accumulator 9 and the inlet side of the oil separator 3 to balance the discharge side and the suction side of the compressor when the air conditioner is stopped and to start up. .

【００１５】さらに、本実施形態の最大の特徴として、
商用周波数圧縮機11の吐出側における逆止弁31の圧縮機
側の配管から、各圧縮機の吸入側配管に冷媒を分流させ
て、逆止弁31以降の負荷に対するバイパス経路を形成す
る開閉弁41が設けられている。また、これと同様に、商
用周波数圧縮機12の吐出側における逆止弁32の圧縮機側
の配管から、各圧縮機の吸入側配管に冷媒を分流させて
バイパス経路を形成する開閉弁42と、商用周波数圧縮機
13の吐出側における逆止弁33の圧縮機側の配管から、各
圧縮機の吸入側配管に冷媒を分流させてバイパス経路を
形成する開閉弁43とが設けられている。また、逆止弁31
〜33の入側と出側の圧力差が小さくなり、しかも圧力が
頻繁に変動すると予測される時、例えば、商用周波数圧
縮機11〜13の起動時及び／又は停止時に該当する開閉弁
41〜43を開放する弁開閉制御回路40を備えている。な
お、この第１の実施形態において、開閉弁41〜43と弁開
閉制御回路40とが本発明のバイパス手段を構成してい
る。Further, as the most characteristic feature of this embodiment,
An on-off valve that divides the refrigerant from the compressor side pipe of the check valve 31 on the discharge side of the commercial frequency compressor 11 to the suction side pipe of each compressor to form a bypass path for the load after the check valve 31. 41 are provided. Further, similarly, from the pipe on the compressor side of the check valve 32 on the discharge side of the commercial frequency compressor 12, the on-off valve 42 that divides the refrigerant to the suction side pipe of each compressor to form a bypass path. , Commercial frequency compressor
An on-off valve 43 that divides the refrigerant from the compressor-side pipe of the check valve 33 on the discharge side of 13 to the suction-side pipe of each compressor to form a bypass path is provided. Also, check valve 31
When the pressure difference between the inlet side and the outlet side of ~ 33 is reduced and the pressure is expected to change frequently, for example, the opening / closing valve corresponding to the start and / or stop of the commercial frequency compressors 11 to 13.
A valve opening / closing control circuit 40 for opening 41 to 43 is provided. In the first embodiment, the opening / closing valves 41 to 43 and the valve opening / closing control circuit 40 form the bypass means of the present invention.

【００１６】上記のように構成された第１の実施形態の
うち、特に、本発明に関係する部分を中心にしてその動
作を以下に説明する。この装置が冷房モードで運転され
たとすれば、四方弁４は実線の矢印で示した冷媒循環経
路を形成する。室内ユニット81〜84が設置された室内の
空調負荷に応じて、図示省略の制御装置により、運転す
べき圧縮機の選択と運転が行われる。この場合、可変周
波数圧縮機10を常時能力制御運転し、空調負荷がその能
力を超える毎に商用周波数圧縮機11、商用周波数圧縮機
12、商用周波数圧縮機13の順に運転台数が増やされる。
これらの圧縮機から吐出されたガス冷媒はオイルセパレ
ータ３→四方弁４→室外熱交換器ユニット５，６→リキ
ッドタンク７→ドライヤ62→室内ユニット81〜84→スト
レーナ63→四方弁４→アキュムレータ９→可変周波数圧
縮機10、商用周波数圧縮機11，12，13の経路で循環せし
められ、周知の熱交換作用によって空調対象室内の空調
が行われる。The operation of the first embodiment constructed as described above will be described below, focusing on the part particularly related to the present invention. If this device is operated in the cooling mode, the four-way valve 4 forms the refrigerant circulation path indicated by the solid arrow. Depending on the air conditioning load in the room where the indoor units 81 to 84 are installed, the controller (not shown) selects and operates the compressor to be operated. In this case, the variable frequency compressor 10 is constantly operated for capacity control, and the commercial frequency compressor 11 and the commercial frequency compressor are operated every time the air conditioning load exceeds the capacity.
The number of operating machines is increased in the order of 12, commercial frequency compressor 13.
The gas refrigerant discharged from these compressors is an oil separator 3 → four-way valve 4 → outdoor heat exchanger units 5 and 6 → liquid tank 7 → dryer 62 → indoor unit 81-84 → strainer 63 → four-way valve 4 → accumulator 9 → The variable frequency compressor 10 and the commercial frequency compressors 11, 12, and 13 are circulated in the paths, and the air-conditioning target room is air-conditioned by the well-known heat exchange action.

【００１７】なお、運転停止中又は運転開始時に開閉弁
45を開放して、可変周波数圧縮機10の吐出側の圧力と吸
入側の圧力とを平衡させて、起動負荷を軽減している。
また、膨張弁53及び開閉弁49を含むクーリングバイパス
を介して、リキッドタンク７の液冷媒の一部を圧縮機ユ
ニット１，２に戻して圧縮機を冷却する。また、オイル
セパレータ３で分離された油は、ストレーナ61、キャピ
ラリーチューブ71等を介して圧縮機ユニット１，２に回
収され、均油管８によって両者の油量が均等化される。It should be noted that the on-off valve is in operation stop or at start of operation.
45 is opened to balance the pressure on the discharge side and the pressure on the suction side of the variable frequency compressor 10 to reduce the starting load.
In addition, a part of the liquid refrigerant in the liquid tank 7 is returned to the compressor units 1 and 2 via a cooling bypass including the expansion valve 53 and the opening / closing valve 49 to cool the compressor. The oil separated by the oil separator 3 is recovered by the compressor units 1 and 2 via the strainer 61, the capillary tube 71, etc., and the oil equalizing pipe 8 equalizes the amounts of both oils.

【００１８】ここで、可変周波数圧縮機10のみが運転さ
れ、商用周波数圧縮機11〜13が停止されておれば、逆止
弁31〜33の作用により可変周波数圧縮機10から吐出され
た冷媒が商用周波数圧縮機11〜13に逆流することはな
く、しかも、逆止弁31の入側と出側とで大きな圧力差を
持っているため、これらの逆止弁を構成する玉の移動は
なく上記「カチカチ音」の発生は無い。Here, if only the variable frequency compressor 10 is operated and the commercial frequency compressors 11 to 13 are stopped, the refrigerant discharged from the variable frequency compressor 10 by the action of the check valves 31 to 33 is reduced. There is no backflow to the commercial frequency compressors 11 to 13, and since there is a large pressure difference between the inlet and outlet of the check valve 31, there is no movement of the balls that make up these check valves. There is no occurrence of the above-mentioned "clicking sound".

【００１９】しかるに、可変周波数圧縮機10のみの運転
中、商用周波数圧縮機11を追加運転する場合、逆止弁31
の入側の冷媒圧力が増大し、その入側と出側の差圧は小
さくなり、微差圧状態となる。この微差圧状態は一様で
は無く極性も変動するため、逆止弁を構成する玉の移動
により「カチカチ音」が発生する。また、可変周波数圧
縮機10及び商用周波数圧縮機11を併用運転中、商用周波
数圧縮機13を停止して可変周波数圧縮機10の単独運転に
移る場合にも同様な現象が発生する。However, when the commercial frequency compressor 11 is additionally operated while only the variable frequency compressor 10 is operating, the check valve 31
The refrigerant pressure on the inlet side increases, and the pressure difference between the inlet side and the outlet side decreases, resulting in a slight differential pressure state. Since this slight differential pressure state is not uniform and the polarity also fluctuates, a "clicking noise" is generated by the movement of the balls constituting the check valve. Also, when the variable frequency compressor 10 and the commercial frequency compressor 11 are operated together, the same phenomenon occurs when the commercial frequency compressor 13 is stopped and the variable frequency compressor 10 is operated independently.

【００２０】弁開閉制御回路40は、商用周波数圧縮機11
の起動時に開閉弁41を例えば５秒間だけ開放させて逆止
弁31の入側圧力を低く保ち、５秒経過後にこれを閉じて
高圧の冷媒を可変周波数圧縮機10から冷媒に合流させ、
反対に、商用周波数圧縮機11の停止時には開閉弁41を例
えば１０秒間だけ開放させて商用周波数圧縮機11の停止
を待って開閉弁41を閉じる。また、弁開閉制御回路40
は、商用周波数圧縮機12，13の起動、停止時において
も、商用周波数圧縮機11の起動、停止時に開閉弁41を開
閉制御したと同様に、開閉弁42，43を開閉制御する。こ
の結果、商用周波数圧縮機11〜13の起動、停止時に逆止
弁31〜41の入側と出側とが微差圧状態になると共に、圧
力変動による騒音の発生を防止することができる。The valve opening / closing control circuit 40 includes a commercial frequency compressor 11
At the time of starting, the on-off valve 41 is opened, for example, for 5 seconds, the inlet pressure of the check valve 31 is kept low, and after 5 seconds, it is closed to allow high-pressure refrigerant to join the variable frequency compressor 10 with the refrigerant.
On the contrary, when the commercial frequency compressor 11 is stopped, the on-off valve 41 is opened for, for example, 10 seconds only, and the on-off valve 41 is closed after the commercial frequency compressor 11 is stopped. In addition, the valve opening / closing control circuit 40
Controls the opening / closing valves 42, 43 even when the commercial frequency compressors 12, 13 are started and stopped, in the same manner as when the opening / closing valve 41 is controlled when starting and stopping the commercial frequency compressor 11. As a result, when the commercial frequency compressors 11 to 13 are started and stopped, the inlet side and the outlet side of the check valves 31 to 41 are in a slightly differential pressure state, and noise due to pressure fluctuation can be prevented.

【００２１】以上、図１に示した第１の実施形態を冷房
モードで運転する場合について説明したが、暖房モード
で運転する場合においても上述した開閉弁41〜43の開閉
制御により逆止弁31〜33からの騒音の発生を防止するこ
とができる。The case where the first embodiment shown in FIG. 1 is operated in the cooling mode has been described above, but the check valve 31 is operated by the above-mentioned opening / closing control of the opening / closing valves 41 to 43 even when operating in the heating mode. It is possible to prevent the generation of noise from ~ 33.

【００２２】図２は本発明に係るマルチ式空気調和装置
の第２の実施形態の構成を示す部分系統図で、特に、逆
止弁31に対応するもののみについて示したもので、商用
周波数圧縮機11の吐出側配管と吸込側配管との間に接続
された開閉弁41と、キャピラリーチューブ77との並列接
続経路でバイパス回路を形成し、このうち、開閉弁41を
弁開閉制御回路40によって開閉制御するものである。こ
れによって開閉弁41の開閉に伴う圧力変動を小さく抑え
ると共に、小流量の開閉弁41で済むことになる。FIG. 2 is a partial systematic diagram showing the configuration of the second embodiment of the multi-type air conditioner according to the present invention. In particular, only the one corresponding to the check valve 31 is shown. An on-off valve 41 connected between the discharge side pipe and the suction side pipe of the machine 11 forms a bypass circuit in a parallel connection path with the capillary tube 77, of which the on-off valve 41 is controlled by the valve opening / closing control circuit 40. It controls opening and closing. As a result, the pressure fluctuation due to the opening / closing of the on-off valve 41 is suppressed to a small level, and the on-off valve 41 with a small flow rate is sufficient.

【００２３】図３は本発明に係るマルチ式空気調和装置
の第３の実施形態の構成を示す部分系統図で、特に、逆
止弁31に対応するもののみについて示したもので、商用
周波数圧縮機11の吐出側配管と吸込側配管との間にキャ
ピラリーチューブ77を接続し、逆止弁31の入側と出側と
が微差圧状態で圧力変動をきたす時間を大幅に短縮して
逆止弁31からの騒音の発生を防止しようとするもので、
この構成によれば、開閉弁41及び弁開閉制御回路40が不
要化されて、構成が著しく簡易化される利点がある。FIG. 3 is a partial systematic diagram showing the configuration of the third embodiment of the multi-type air conditioner according to the present invention. In particular, only the one corresponding to the check valve 31 is shown. Connect a capillary tube 77 between the discharge side pipe and the suction side pipe of the machine 11 to significantly reduce the time required for pressure fluctuations between the inlet side and outlet side of the check valve 31 in the state of slight differential pressure and reverse In order to prevent noise from the stop valve 31,
According to this configuration, the opening / closing valve 41 and the valve opening / closing control circuit 40 are not required, and there is an advantage that the configuration is significantly simplified.

【００２４】[0024]

【発明の効果】以上の説明によって明らかなように、本
発明によれば、空調負荷に応じて商用周波数圧縮機を起
動、停止させるに当たり、その吐出側に設けられた逆止
弁の前後の頻繁な圧力変動を抑えるバイパス手段を備え
ているので、圧縮機の起動停止に伴う逆止弁からの騒音
の発生を抑えることができる。As is apparent from the above description, according to the present invention, when the commercial frequency compressor is started and stopped in accordance with the air conditioning load, the frequent operation before and after the check valve provided on the discharge side is performed. Since the bypass means for suppressing various pressure fluctuations is provided, it is possible to suppress the generation of noise from the check valve due to the start and stop of the compressor.

【００２５】この場合、バイパス手段は、商用周波数圧
縮機の吐出側配管と吸込側配管との間に接続された開閉
弁と、逆止弁の前後の圧力が頻繁に変動すると予測され
る期間に、開閉弁を開放する弁開閉制御回路とで構成す
ることによって、騒音の発生を確実に抑えることがで
き、さらに、この開閉弁にキャピラリチューブを並列接
続することによって、流量の少ない開閉弁の使用が可能
となる。In this case, the bypass means is connected to the open / close valve connected between the discharge side pipe and the suction side pipe of the commercial frequency compressor, and the pressure before and after the check valve is expected to change frequently. , And the valve opening / closing control circuit that opens the opening / closing valve can surely suppress the generation of noise, and by connecting a capillary tube in parallel to this opening / closing valve, use of an opening / closing valve with a small flow rate can be achieved. Is possible.

【００２６】また、バイパス手段として、商用周波数圧
縮機の吐出側配管と吸込側配管との間にキャピラリーチ
ューブのみを接続するだけでも十分な場合があり、この
場合には構成が著しく簡易化される利点がある。In some cases, it may be sufficient to connect only the capillary tube between the discharge side pipe and the suction side pipe of the commercial frequency compressor as the bypass means. In this case, the structure is remarkably simplified. There are advantages.

【図面の簡単な説明】[Brief description of drawings]

【図１】本発明の第１の実施形態の構成を示す冷凍サイ
クルの全体系統図。FIG. 1 is an overall system diagram of a refrigeration cycle showing a configuration of a first embodiment of the present invention.

【図２】本発明の第２の実施形態の構成を示す冷凍サイ
クルの部分系統図。FIG. 2 is a partial system diagram of a refrigeration cycle showing a configuration of a second embodiment of the present invention.

【図３】本発明の第３の実施形態の構成を示す冷凍サイ
クルの部分系統図。FIG. 3 is a partial system diagram of a refrigeration cycle showing a configuration of a third embodiment of the present invention.

【符号の説明】[Explanation of symbols]

１，２ 圧縮機ユニット ３ オイルセパレータ ４ 四方弁 ５，６ 室外熱交換器ユニット ７ リキッドタンク ９ アキュムレータ １０ 可変周波数圧縮機 １１〜１３ 商用周波数圧縮機 ３１〜３３ 逆止弁 ４０ 弁開閉制御回路 ４１〜４３ 開閉弁 ７７ キャピラリーチューブ ８１〜８４ 室内ユニット 1, 2 compressor unit 3 oil separator 4 four-way valve 5, 6 outdoor heat exchanger unit 7 Liquid tank 9 Accumulator 10 variable frequency compressor 11-13 Commercial frequency compressor 31-33 Check valve 40 Valve open / close control circuit 41-43 open / close valve 77 Capillary tube 81-84 Indoor unit

───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) F25B 1/00 361 F25B 13/00 ─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. 7 , DB name) F25B 1/00 361 F25B 13/00

Claims (7)

(57)【特許請求の範囲】(57) [Claims] 【請求項１】互いに並列接続される複数台の圧縮機が商
用周波数で運転される商用周波数圧縮機を含み、この商
用周波数圧縮機の吐出側にそれぞれ逆止弁が配設された
冷凍サイクルを備え、空調負荷に応じて前記商用周波数
圧縮機の起動、停止を行うマルチ式空気調和装置におい
て、 前記逆止弁の前後の圧力が頻繁に変動すると予測される
期間に、前記商用周波数圧縮機の吐出側と前記逆止弁と
の間の配管から前記商用周波数圧縮機の吸込側配管へ、
冷媒を分流させるバイパス手段を備えたことを特徴とす
るマルチ式空気調和装置。1. A refrigeration cycle in which a plurality of compressors connected in parallel to each other includes a commercial frequency compressor operated at a commercial frequency, and a check valve is provided on each of the discharge sides of the commercial frequency compressor. In a multi-type air conditioner that starts and stops the commercial frequency compressor according to an air conditioning load, in a period in which the pressure before and after the check valve is expected to fluctuate frequently, the commercial frequency compressor From the pipe between the discharge side and the check valve to the suction side pipe of the commercial frequency compressor,
A multi-type air conditioner comprising a bypass means for dividing a refrigerant. 【請求項２】前記バイパス手段は、前記商用周波数圧縮
機の吐出側配管と吸込側配管との間に接続された開閉弁
と、前記逆止弁の前後の圧力が頻繁に変動すると予測さ
れる期間に、前記開閉弁を開放する弁開閉制御回路とを
備えたことを特徴とする請求項１に記載のマルチ式空気
調和装置。2. The bypass means predicts that the pressure before and after the on-off valve connected between the discharge side pipe and the suction side pipe of the commercial frequency compressor and the pressure before and after the check valve frequently change. The multi-type air conditioner according to claim 1, further comprising a valve opening / closing control circuit that opens the opening / closing valve during a period. 【請求項３】前記バイパス手段は、さらに、前記開閉弁
に並列接続されたキャピラリチューブを備えたことを特
徴とする請求項２に記載のマルチ式空気調和装置。3. The multi-type air conditioner according to claim 2, wherein the bypass means further includes a capillary tube connected in parallel to the on-off valve. 【請求項４】前記逆止弁の前後の圧力が頻繁に変動する
と予測される期間は、前記商用周波数圧縮機の起動時で
あることを特徴とする請求項１乃至３のいずれかに記載
のマルチ式空気調和装置。4. The period according to claim 1, wherein the period in which the pressure before and after the check valve is expected to fluctuate frequently is when the commercial frequency compressor is started. Multi-type air conditioner. 【請求項５】前記逆止弁の前後の圧力が頻繁に変動する
と予測される期間は、前記商用周波数圧縮機の停止時で
あることを特徴とする請求項１乃至３のいずれかに記載
のマルチ式空気調和装置。5. The period according to claim 1, wherein the period in which the pressure before and after the check valve is expected to fluctuate frequently is when the commercial frequency compressor is stopped. Multi-type air conditioner. 【請求項６】前記逆止弁の前後の圧力が頻繁に変動する
と予測される期間は、前記商用周波数圧縮機の起動時及
び停止時の両方であることを特徴とする請求項１乃至３
のいずれかに記載のマルチ式空気調和装置。6. The period during which the pressure before and after the check valve is predicted to change frequently is both when the commercial frequency compressor is started and when it is stopped.
The multi-type air conditioner according to any one of 1. 【請求項７】前記バイパス手段は、前記商用周波数圧縮
機の吐出側配管と吸込側配管との間に接続されたキャピ
ラリーチューブであることを特徴とする請求項１に記載
のマルチ式空気調和装置。7. The multi-type air conditioner according to claim 1, wherein the bypass means is a capillary tube connected between a discharge side pipe and a suction side pipe of the commercial frequency compressor. .
JP06297896A 1996-03-19 1996-03-19 Multi-type air conditioner Expired - Fee Related JP3480778B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP06297896A JP3480778B2 (en) 1996-03-19 1996-03-19 Multi-type air conditioner

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP06297896A JP3480778B2 (en) 1996-03-19 1996-03-19 Multi-type air conditioner

Publications (2)

Publication Number Publication Date
JPH09250819A JPH09250819A (en) 1997-09-22
JP3480778B2 true JP3480778B2 (en) 2003-12-22

Family

ID=13215965

Family Applications (1)

Application Number Title Priority Date Filing Date
JP06297896A Expired - Fee Related JP3480778B2 (en) 1996-03-19 1996-03-19 Multi-type air conditioner

Country Status (1)

Country Link
JP (1) JP3480778B2 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1286261C (en) 1999-11-12 2006-11-22 Lg电子株式会社 Device and method for controlling supply of current and static capacitance to compressor
KR100591321B1 (en) * 2004-12-15 2006-06-19 엘지전자 주식회사 Air conditioner
JP6441000B2 (en) * 2014-08-27 2018-12-19 株式会社Ｎｔｔファシリティーズ Vapor compression refrigeration cycle

Also Published As

Publication number Publication date
JPH09250819A (en) 1997-09-22

Similar Documents

Publication Publication Date Title
JP4394709B2 (en) Apparatus and method for preventing accumulation of liquid refrigerant in air conditioner
EP0715133B1 (en) Refrigerator
US5673570A (en) Oil equalizing operation control device for air conditioner
JPH0232546B2 (en)
US7721559B2 (en) Multi-type air conditioner and method for controlling the same
US20060123834A1 (en) Air conditioner
JP3480778B2 (en) Multi-type air conditioner
JP2001056156A (en) Air conditioning apparatus
JPH085169A (en) Air conditioner
JPH11108473A (en) Air conditioner
JP3848098B2 (en) Air conditioner
KR100524719B1 (en) By-pass device with variable flow rate of multi air-conditioner system
JPH04324069A (en) Refrigerating plant
JP3138031B2 (en) Refrigeration equipment
CN1888690A (en) Outdoor fan controlling method for air conditioner under overloading state
JP3143140B2 (en) Refrigeration equipment
JP2001349629A (en) Heat pump device
JP2005061740A (en) Air conditioner
WO2024134852A1 (en) Air conditioning device
JP2983782B2 (en) Air conditioner
JP3099574B2 (en) Air conditioner pressure equalizer
EP1672299A2 (en) Air conditioner and method for controlling the same
KR102422010B1 (en) Multi-air conditioner for heating and cooling operations
JPH0320571A (en) Air conditioner
JP3441914B2 (en) Air conditioner

Legal Events

Date Code Title Description
FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20081010

Year of fee payment: 5

S111 Request for change of ownership or part of ownership

Free format text: JAPANESE INTERMEDIATE CODE: R313111

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20081010

Year of fee payment: 5

R350 Written notification of registration of transfer

Free format text: JAPANESE INTERMEDIATE CODE: R350

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20081010

Year of fee payment: 5

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20091010

Year of fee payment: 6

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20091010

Year of fee payment: 6

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20101010

Year of fee payment: 7

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20111010

Year of fee payment: 8

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20121010

Year of fee payment: 9

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20121010

Year of fee payment: 9

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20131010

Year of fee payment: 10

LAPS Cancellation because of no payment of annual fees