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JPH063324B2 - Refrigeration equipment - Google Patents
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JPH063324B2 - Refrigeration equipment - Google Patents

Refrigeration equipment

Info

Publication number
JPH063324B2
JPH063324B2 JP22751685A JP22751685A JPH063324B2 JP H063324 B2 JPH063324 B2 JP H063324B2 JP 22751685 A JP22751685 A JP 22751685A JP 22751685 A JP22751685 A JP 22751685A JP H063324 B2 JPH063324 B2 JP H063324B2
Authority
JP
Japan
Prior art keywords
oil
compressor
compressors
dome
pipe
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
JP22751685A
Other languages
Japanese (ja)
Other versions
JPS6287771A (en
Inventor
和生 米本
功 近藤
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.)
Daikin Industries Ltd
Original Assignee
Daikin Industries Ltd
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 Daikin Industries Ltd filed Critical Daikin Industries Ltd
Priority to JP22751685A priority Critical patent/JPH063324B2/en
Publication of JPS6287771A publication Critical patent/JPS6287771A/en
Publication of JPH063324B2 publication Critical patent/JPH063324B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2400/00Component parts or details not otherwise provided for in this subclass
    • F25B2400/07Details of compressors or related parts
    • F25B2400/075Details of compressors or related parts with parallel compressors

Landscapes

  • Compressors, Vaccum Pumps And Other Relevant Systems (AREA)

Description

【発明の詳細な説明】 (産業上の利用分野) 本発明は、吸入管によりドーム内に吸入された冷媒ガス
を圧縮して吐出管により吐出させる複数基の可変容量型
圧縮機を1系統の冷媒回路に並列に接続してなる冷凍装
置に関し、特に圧縮機間の均油を図る対策に関する。
DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention provides a plurality of variable displacement compressors that compress refrigerant gas sucked into a dome by a suction pipe and discharge it by a discharge pipe. The present invention relates to a refrigerating device connected in parallel to a refrigerant circuit, and particularly to a measure for achieving oil equalization between compressors.

(従来の技術) 一般に、このような冷凍装置では、各圧縮機から吐出さ
れた冷媒ガスは互いに集合されて油分離器に送出され、
ここで冷媒ガス中に分散している潤滑油が分離された
後、凝縮器へ供給され、一方、上記油分離器で分離され
た潤滑油は油戻し管を介して各圧縮機にほぼ均等に返油
されるようになされている。
(Prior Art) Generally, in such a refrigeration system, the refrigerant gas discharged from each compressor is collected together and sent to the oil separator,
Here, the lubricating oil dispersed in the refrigerant gas is separated and then supplied to the condenser, while the lubricating oil separated by the oil separator is almost evenly distributed to each compressor through the oil return pipe. It is designed to return oil.

ところで、各圧縮機の稼動時間が異なる場合には、稼動
時間の長い圧縮機側では稼動中に冷媒ガス中に分散され
る潤滑油の量が稼動時間の短い圧縮機側よりも多くな
る。しかし、この冷媒ガス中に分散された潤滑油は上述
の如く各圧縮機にほぼ均等に分配して返油されることか
ら、稼動時間の長い圧縮機内の潤滑油の量が漸減する一
方、稼動時間の短い圧縮機内の潤滑油の量が漸増して、
各圧縮機内に油量のアンバランスが生ずることとなる。
そして、圧縮機内の油量が漸減して油面が運転油面レベ
ル以下に下がると、潤滑油の潤滑部への供給が絶たれて
圧縮機が損傷するおそれがあった。
By the way, when the operating time of each compressor is different, the amount of lubricating oil dispersed in the refrigerant gas during operation is larger on the side of the compressor having a long operating time than on the side of a compressor having a short operating time. However, since the lubricating oil dispersed in this refrigerant gas is distributed almost evenly to each compressor as described above and returned, the amount of lubricating oil in the compressor with a long operating time gradually decreases while The amount of lubricating oil in the compressor with a short time gradually increases,
An imbalance in the amount of oil will occur in each compressor.
When the amount of oil in the compressor gradually decreases and the oil level drops below the operating oil level, the supply of lubricating oil to the lubrication section is cut off, which may damage the compressor.

そこで、従来、上記各圧縮機内における油量のアンバラ
ンスを解消するために、各圧縮機を均油管でもって連通
させ、油量の多い方から少ない方へと潤滑油を移動させ
ることにより、各圧縮機内の油量の均一化を図るように
したものが、例えば特公昭40−25038号公報や実
公昭53−36600号公報に開示されている。
Therefore, conventionally, in order to eliminate the imbalance of the oil amount in each of the compressors, each compressor is communicated with an oil equalizing pipe, and by moving the lubricating oil from the one with a large amount of oil to the one with a small amount of oil, A device designed to make the amount of oil in the compressor uniform is disclosed in, for example, Japanese Patent Publication No. 40-25038 and Japanese Utility Model Publication No. 53-36600.

(発明が解決しようとする課題) ところで、上記の従来のものでは、各圧縮機の運転容量
が異なる場合には、運転容量の大きい側の圧縮機に対す
る吸入管の圧力損失が大きくなるため、圧縮機のドーム
内圧は逆に運転容量の小さい側の圧縮機の方が高くな
り、その結果、冷媒ガスは運転容量の小さい圧縮機から
大きい圧縮機へ均油管を通じて移動するとともに、機内
の潤滑油も同方向に移動する。そて、上記運転容量の小
さい圧縮機内における油の戻り量が吐出量よりも多いと
きには、均油管レベル以上の潤滑油は均油管を介して運
転容量の大きい圧縮機内に移動し、各圧縮機内の油面レ
ベルは均油管位置で等しくなるが、逆に、油の戻り量が
吐出量よりも少ないときには、運転容量の小さい圧縮機
内の油面レベルが時間の経過と共に低下し(このとき、
運転容量の大きい圧縮機内の潤滑油は、各圧縮機のドー
ム内圧の差により運転容量の小さい圧縮機への移動が阻
止されている)、遂には油面レベルの運転油面レベル以
下への低下により潤滑油の潤滑部への供給が絶たれて圧
縮機の損傷を招くことになる。
(Problems to be solved by the invention) By the way, in the above-mentioned conventional compressor, when the operating capacities of the compressors are different from each other, the pressure loss of the suction pipe with respect to the compressor on the side of the large operating capacity becomes large, and therefore, On the contrary, the dome internal pressure of the machine becomes higher in the compressor with the smaller operating capacity, and as a result, the refrigerant gas moves from the compressor with the smaller operating capacity to the compressor with the larger operating capacity through the oil equalizing pipe, and the lubricating oil in the machine also increases. Move in the same direction. Then, when the amount of oil returned in the compressor with a small operating capacity is larger than the discharge amount, the lubricating oil above the oil equalizing pipe level moves into the compressor with a large operating capacity through the oil equalizing pipe, The oil level becomes equal at the oil level position, but conversely, when the amount of oil returned is smaller than the discharge, the oil level in the compressor with a small operating capacity decreases with the passage of time (at this time,
The lubricating oil in the compressor with a large operating capacity is prevented from moving to the compressor with a small operating capacity due to the difference in the dome internal pressure of each compressor.) Finally, the oil level drops below the operating oil level. As a result, the supply of lubricating oil to the lubrication section is interrupted and the compressor is damaged.

そこで、この問題点を解決すべく、各圧縮機内を連通す
る均油管を大径のものとすることにより、上述の如き油
戻り量が吐出量よりも少ないときであっても、潤滑油
を、ドーム内圧の差により運転容量の小さい圧縮機から
大きい圧縮機へと流れる冷媒ガスの流動方向とは逆方向
すなわち運転容量の大きい圧縮機から小さい圧縮機へ移
動できるようにすることが考えられる。
Therefore, in order to solve this problem, by making the oil equalizing pipes communicating with each compressor have a large diameter, even when the oil return amount as described above is smaller than the discharge amount, the lubricating oil is It is considered that due to the difference in the dome internal pressure, the refrigerant gas flowing from the compressor having a small operating capacity to the compressor having a large operating capacity can be moved in the opposite direction, that is, from the compressor having a large operating capacity to the compressor having a small operating capacity.

ところが、この大径の均油管を用いる場合には、一方の
圧縮機に発生する振動が均油管を介して他方の圧縮機に
伝わり易く、振動モードが複雑になるとともに、均油管
内におけるトラップの発生を防止するために複数な管形
状を採用することができず、均油管の強度を十分に確保
することが困難になるという問題が生じる。
However, when using this large-diameter oil equalizing pipe, the vibration generated in one compressor is easily transmitted to the other compressor via the oil equalizing pipe, the vibration mode becomes complicated, and the trap of the oil in the oil equalizing pipe is complicated. Since a plurality of tube shapes cannot be adopted to prevent the occurrence, there arises a problem that it becomes difficult to secure sufficient strength of the oil equalizing tube.

また、均油管で連結した各圧縮機内の油量を均一にする
他の解決手段として、油分離器から各圧縮機内に戻る潤
滑油の油量を、例えばフロート式レギュレータを使用し
て調整する方法や、各圧縮機内の油面を検知する油面セ
ンサからの信号により電磁弁を開閉して制御する方法な
どが考えられるが、その分、制御部品が増加することか
ら、装置のコストアップ化を招くとともに、制御面にお
いても信頼性に欠けるきらいがある。
Further, as another solution for equalizing the amount of oil in each compressor connected by an oil equalizing pipe, a method of adjusting the amount of lubricating oil returning from the oil separator into each compressor by using, for example, a float type regulator. Alternatively, a method of controlling by opening and closing the solenoid valve by a signal from an oil level sensor that detects the oil level in each compressor can be considered, but since the number of control parts increases by that amount, it is possible to increase the cost of the device. In addition to this, there is a tendency to lack reliability in terms of control.

本発明はかかる諸点に鑑みてなされたものであり、その
目的とするところは、上記した均油管を備えた冷凍装置
において、油分離器で分離された潤滑油の各圧縮機に対
する返油量を該各圧縮機の運転容量に対応させて制御す
る手段を講じることにより、大径の均油管を用いること
による圧縮機への振動増大や均油管の強度低下を防止
し、しかも制御部品の増加によるコストアップ化や信頼
性の低下を防止しつつ、各圧縮機内における油量の均一
化を図ることにある。
The present invention has been made in view of these points, and an object thereof is to provide the amount of oil returned to each compressor of the lubricating oil separated by the oil separator in the refrigerating apparatus including the above-described oil equalizing pipe. By taking measures to control in accordance with the operating capacity of each compressor, it is possible to prevent an increase in vibration of the compressor and a decrease in strength of the oil equalizing pipe due to the use of a large diameter oil equalizing pipe, and to increase the number of control parts. It is intended to equalize the amount of oil in each compressor while preventing cost increase and reliability deterioration.

(課題を解決するための手段) 上記の目的を達成するため、本発明の解決手段は、第1
図に示すように、吸入管(8)によりドーム(4)内に
吸入された冷媒ガスを圧縮して吐出管(9)により吐出
させる複数基の可変容量型圧縮機(1),(2),
(3)を1系統の冷媒回路に並列に接続してなる冷凍装
置に対し、上記各圧縮機(1),(2),(3)のドー
ム(4)内を潤滑油(A)の運転油面レベル位置にて互
いに連通する均油管(10),(10)と、上記吐出管
(9)により各圧縮機(1),(2),(3)のドーム
(4)外に吐出されて集合された冷媒ガスから潤滑油
(A)を分離する油分離器(11)と、この油分離器
(11)で分離された潤滑油(A)を上記各圧縮機
(1),(2),(3)のドーム(4)内にそれぞれ戻
す油戻し管(12),(13),(14)と、この各油
戻し管(12),(13),(14)を開閉する電磁弁
(15),(16),(17)とを設ける。さらに、該
各電磁弁(15),(16),(17)を所定時間毎に
開くように開閉制御するコントローラ(18)を設け、
上記各圧縮機(1),(2),(3)の運転容量が増大
するほど該各圧縮機(1),(2),(3)に対応する
電磁弁(15),(16),(17)の所定時間毎の開
時間が長くなるよう、各電磁弁(15),(16),
(17)を各圧縮機(1),(2),(3)の運転容量
に従って上記コントローラ(18)で開閉制御する構成
とする。
(Means for Solving the Problem) In order to achieve the above object, the solution means of the present invention is
As shown in the figure, a plurality of variable displacement compressors (1), (2) that compress the refrigerant gas sucked into the dome (4) by the suction pipe (8) and discharge it by the discharge pipe (9). ,
Operation of lubricating oil (A) in the dome (4) of each of the compressors (1), (2), and (3) for a refrigeration system in which (3) is connected in parallel to a single-system refrigerant circuit It is discharged to the outside of the dome (4) of each compressor (1), (2), (3) by the oil equalizing pipes (10), (10) communicating with each other at the oil level level and the discharge pipe (9). The oil separator (11) for separating the lubricating oil (A) from the collected refrigerant gas, and the lubricating oil (A) separated by the oil separator (11) are used as the compressors (1), (2). ), (3) oil return pipes (12), (13), (14) returning to the dome (4) respectively, and electromagnetic valves for opening and closing the oil return pipes (12), (13), (14). Valves (15), (16) and (17) are provided. Further, there is provided a controller (18) for controlling the opening / closing of each of the solenoid valves (15), (16), (17) so that the solenoid valves are opened at predetermined time intervals.
Solenoid valves (15), (16), corresponding to the compressors (1), (2), (3), as the operating capacities of the compressors (1), (2), (3) increase. Each solenoid valve (15), (16), so that the opening time of (17) at every predetermined time becomes long.
The controller (18) controls the opening and closing of (17) according to the operating capacities of the compressors (1), (2) and (3).

(作用) 上記の構成により、本発明では、1系統の冷媒回路に並
列に接続された複数基の可変容量型圧縮機(1),
(2),(3)の各ドーム(4)内に吸入管(8)によ
り吸入された冷媒ガスは、各圧縮機(1),(2),
(3)により圧縮された後、吐出管(9)を介して吐出
されて油分離器(11)で潤滑油(A)が分離され、こ
の油分離器(11)で分離された潤滑油(A)は油戻し
管(12),(13),(14)を経て上記各圧縮機
(1),(2),(3)のドーム(4)内にそれぞれ戻
される。
(Operation) With the above configuration, in the present invention, a plurality of variable displacement compressors (1) connected in parallel to the refrigerant circuit of one system,
The refrigerant gas sucked by the suction pipe (8) into each dome (4) of (2) and (3) is transferred to each compressor (1), (2),
After being compressed by (3), it is discharged through the discharge pipe (9), the lubricating oil (A) is separated by the oil separator (11), and the lubricating oil (A) separated by this oil separator (11) A) is returned through the oil return pipes (12), (13) and (14) into the dome (4) of each of the compressors (1), (2) and (3).

その際、上記油戻し管(12),(13),(14)を
開閉する電磁弁(15),(16),(17)は上記各
圧縮機(1),(2),(3)の運転容量の入力信号と
するコントローラ(18)により所定時間毎に開くよう
に開閉制御され、運転容量の大きい圧縮機(1),
(2),(3)に対応する電磁弁(15),(16),
(17)が運転容量の小さい圧縮機(1),(2),
(3)に対応する電磁弁(15),(16),(17)
よりも長時間開かれて、運転容量の大きい圧縮機
(1),(2),(3)に対する返油量が増大せしめら
れる。このため、油吐出量が多い大運転容量の圧縮機
(1),(2),(3)の油量が減少しても、この減少
した油量が上記長時間だけ開かれた電磁弁(15),
(16),(17)を通しての返油によって補われ、各
圧縮機(1),(2),(3)内の油面の均一化が量ら
れることとなる。
At that time, the solenoid valves (15), (16) and (17) for opening and closing the oil return pipes (12), (13) and (14) are the compressors (1), (2) and (3). The operating capacity of the compressor (1) is controlled by the controller (18) which is an input signal of the operating capacity so that the compressor (1) has a large operating capacity.
Solenoid valves (15), (16) corresponding to (2) and (3)
(17) is a compressor (1), (2) with a small operating capacity,
Solenoid valves (15), (16), (17) corresponding to (3)
The oil is returned to the compressors (1), (2), (3) having a large operating capacity for a longer period of time to increase the amount of oil returned. Therefore, even if the amount of oil in the compressors (1), (2), (3) of large operating capacity with a large amount of oil discharge is reduced, the reduced amount of oil is the solenoid valve opened for the above long time ( 15),
It is compensated by the oil return through (16) and (17), and the leveling of the oil level in each compressor (1), (2) and (3) is measured.

(実施例) 以下、本発明の実施例を図面に基づいて説明する。(Example) Hereinafter, the Example of this invention is described based on drawing.

第1図は本発明の実施例に係る冷凍装置の概略構成を示
し、(1),(2),(3)は1系統の冷媒回路に互い
に並列に接続された可変容量型の第1、第2および第3
圧縮機であって、該各圧縮機(1),(2),(3)は
密閉ドーム(4)内に電動モータ(5)および電動モー
タ(5)の駆動軸(6)に連結された圧縮機本体(7)
を備えてなり、各ドーム(4)内底部には圧縮機本体
(7)の潤滑部に供給される潤滑油(A)が貯留されて
いる。なお、可変容量型圧縮機としては、気筒をアンロ
ードするもの、インバータ駆動のもの、極数変換モータ
を使用するものなどいずれでもよい。
FIG. 1 shows a schematic configuration of a refrigerating apparatus according to an embodiment of the present invention, in which (1), (2), and (3) are variable capacity type first, which are connected in parallel to one refrigerant circuit, Second and third
A compressor, wherein each compressor (1), (2), (3) is connected to an electric motor (5) and a drive shaft (6) of the electric motor (5) in a closed dome (4). Compressor body (7)
And the lubricating oil (A) supplied to the lubricating portion of the compressor body (7) is stored in the inner bottom portion of each dome (4). The variable displacement compressor may be one that unloads the cylinder, one that is driven by an inverter, or one that uses a pole number conversion motor.

また、上記第1、第2圧縮機(1),(2)のドーム
(4),(4)間および第2、第3圧縮機(2),
(3)のドーム(4),(4)間はそれぞれの内部を潤
滑油(A)の運転油面レベル位置にて連通するよう均油
管(10),(10)で連結されており、潤滑油(A)
が均油管(10),(10)を介して各圧縮機(1),
(2),(3)間を移動可能になようになされている。
In addition, between the domes (4) and (4) of the first and second compressors (1) and (2) and between the second and third compressors (2),
The dome (4) and (4) of (3) are connected by oil equalizing pipes (10) and (10) so that the insides of the domes (4) and (4) communicate with each other at the level of the operating oil level of the lubricating oil (A). Oil (A)
Through the oil equalizing pipes (10), (10) to the compressors (1),
It is designed to be movable between (2) and (3).

さらに、(8)は上記各圧縮機(1),(2)(3)の
ドーム(4)内部に冷媒ガスを吸入するための吸入管で
あって、該吸入管(8)は、メイン配管部(8a)と、
該メイン配管部(8a)に分岐接続された3本のサブ配
管部(8b),(8b),(8b)とからなり、各サブ
配管部(8b)の下流端はそれぞれ圧縮機(1),
(2),(3)のドーム(4)内上部に開口されてい
る。また、(9)は上記各圧縮機(1),(2),
(3)の圧縮機本体(7)で圧縮された冷媒ガスを各ド
ーム(4)外に吐出するための吐出管であって、該吐出
管(9)は、各圧縮機(1),(2),(3)の圧縮機
本体(7)に接続されたサブ配管部(9b),(9
b),(9b)と、該サブ配管部(9b),(9b),
(9b)の下流端に接続されたメイン配管部(9a)と
からなる。よって、各圧縮機(1),(2),(3)で
は吸入管(8)によりドーム(4)内に吸入された冷媒
ガスを圧縮機本体(7)で圧縮した後、吐出管(9)を
介してドーム(4)外に吐出するように構成されてい
る。
Further, (8) is a suction pipe for sucking a refrigerant gas into the dome (4) of each of the compressors (1), (2) and (3), and the suction pipe (8) is a main pipe. Part (8a),
It consists of three sub-pipes (8b), (8b), (8b) branched and connected to the main pipe (8a), and the downstream end of each sub-pipe (8b) is the compressor (1). ,
It is opened in the upper part in the dome (4) of (2) and (3). Further, (9) is each of the compressors (1), (2),
A discharge pipe for discharging the refrigerant gas compressed in the compressor body (7) of (3) to the outside of each dome (4), wherein the discharge pipe (9) is provided for each compressor (1), ( 2), sub-pipe parts (9b), (9) connected to the compressor body (7) of (3)
b), (9b) and the sub-pipe parts (9b), (9b),
The main pipe section (9a) is connected to the downstream end of (9b). Therefore, in each of the compressors (1), (2), and (3), the refrigerant gas sucked into the dome (4) by the suction pipe (8) is compressed by the compressor body (7) and then discharged by the discharge pipe (9). ) And is discharged to the outside of the dome (4).

また、上記吐出管(9)には、吐出管(9)により各圧
縮機(1),(2),(3)のドーム(4)外に吐出さ
れて集合された冷媒ガスから潤滑油(A)を分離する油
分離器(11)が介設され、該油分離器(11)は上記
第1圧縮機(1)のドーム(4)に至る吸入管(8)の
サブ配管部(8b)に第1油戻し管(12)を介して接
続されているとともに、該第1油戻し管(12)の途中
には第2油および第3油戻し管(13),(14)の各
一端がそれぞれ分岐接続され、該第2油戻し管(13)
の他端は上記第2圧縮機(2)のドーム(4)に至る吸
入管(8)のサブ配管部(8b)に、第3油戻し管(1
4)の他端は上記第3圧縮機(3)のドーム(4)に至
る吸入管(8)のサブ配管部(8b)にそれぞれ接続さ
れており、油分離器(11)で分離された潤滑油(A)
を第1,第2および第3油戻し管(12),(13),
(14)を介して上記各圧縮機(1),(2),(3)
へそれぞれ戻すようになされている。
In the discharge pipe (9), lubricating oil (from the refrigerant gas collected by being discharged to the outside of the dome (4) of each compressor (1), (2), (3) by the discharge pipe (9) ( An oil separator (11) for separating A) is provided, and the oil separator (11) is a sub-pipe portion (8b) of the suction pipe (8) reaching the dome (4) of the first compressor (1). ) Via the first oil return pipe (12), and the second oil and the third oil return pipes (13), (14) are provided in the middle of the first oil return pipe (12). The second oil return pipe (13) has one end branched and connected.
The other end of the third oil return pipe (1) to the sub-pipe portion (8b) of the suction pipe (8) that reaches the dome (4) of the second compressor (2).
The other end of 4) is connected to the sub-pipe part (8b) of the suction pipe (8) reaching the dome (4) of the third compressor (3) and separated by the oil separator (11). Lubricating oil (A)
The first, second and third oil return pipes (12), (13),
Each compressor (1), (2), (3) through (14)
It is designed to return to each.

さらに、上記第1油戻し管(12)の第2油戻し管(1
3)との接続部よりも下流側には第1油戻し管(12)
を開閉する第1電磁弁(15)が、また上記第2油戻し
管(13)には第2油戻し管(13)を開閉する第2電
磁弁(16)が、さらに上記第3油戻し管(14)には
第3油戻し管(14)を開閉する第3電磁弁(17)が
それぞれ介設されており、これらの電磁弁(15),
(16),(17)を開閉することにより、油分離器
(11)から第1、第2および第3圧縮機(1),
(2),(3)への返油またはその停止が行われる。
Further, the second oil return pipe (1) of the first oil return pipe (12) is
3) The first oil return pipe (12) is located downstream of the connection with
A first solenoid valve (15) for opening and closing the second oil return pipe (13) and a second solenoid valve (16) for opening and closing the second oil return pipe (13) and the third oil return pipe (13). The pipe (14) is provided with a third solenoid valve (17) for opening and closing the third oil return pipe (14), and these solenoid valves (15),
By opening and closing (16) and (17), the first, second and third compressors (1) from the oil separator (11),
Oil is returned to (2) and (3) or stopped.

これら第1、第2および第3電磁弁(15),(1
6),(17)は所定時間毎に開くようにコントローラ
(18)により開閉制御されるようになされている。該
コントローラ(18)には、上記第1圧縮機(1)の運
転容量を検出する第1運転容量センサ(19)と、上記
第2圧縮機(2)の運転容量を検出する第2運転容量セ
ンサ(20)と、上記第3圧縮機(3)の運転容量を検
出する第3運転容量センサ(21)との夫々の検出信号
が入力されており、このコントローラ(18)により、
各圧縮機(1),(2),(3)の運転容量に従って該
各圧縮機(1),(2),(3)に対応する上記各電磁
弁(15),(16),(17)を開閉制御し、運転容
量の大きい圧縮機(1),(2),(3)に対応する電
磁弁(15),(16),(17)の所定時間毎の開時
間を運転容量の小さい圧縮機(1),(2),(3)に
対応する電磁弁(15),(16),(17)の所定時
間毎の開時間よりも長くするように開閉制御される。
These first, second and third solenoid valves (15), (1
6) and 17) are controlled to be opened / closed by a controller 18 so as to be opened every predetermined time. The controller (18) includes a first operating capacity sensor (19) for detecting the operating capacity of the first compressor (1) and a second operating capacity for detecting the operating capacity of the second compressor (2). Detection signals of the sensor (20) and the third operating capacity sensor (21) for detecting the operating capacity of the third compressor (3) are input, and the controller (18) controls
The solenoid valves (15), (16), (17) corresponding to the compressors (1), (2), (3) according to the operating capacities of the compressors (1), (2), (3). ) Is controlled to open / close the solenoid valve (15), (16), (17) corresponding to the compressor (1), (2), (3) having a large operating capacity, and the opening time of the operating capacity at every predetermined time. The opening / closing control is performed so that the solenoid valves (15), (16) and (17) corresponding to the small compressors (1), (2) and (3) are made longer than the opening time at every predetermined time.

上記各電磁弁(15),(16),(17)の開閉モー
ドを第2図に例示する。図では、第1圧縮機(1)の運
転容量を100%に、第2、第3圧縮機(2),(3)
の運転容量を共に50%にそれぞれ設定した場合を示
し、第1圧縮機(1)に対応する第1電磁弁(15)の
開時間がt時間(例えば1分)であるとすると、第2,
3圧縮機(2),(3)に対応する第2,3電磁弁(1
6),(17)の開時間は上記運転容量の比に応じてそ
の半分のt/2(例えば30秒)になるように、かつ各
電磁弁(15),(16),(17)がT時間(例えば
5分)毎に開くように設定されている。
The opening / closing modes of the solenoid valves (15), (16) and (17) are illustrated in FIG. In the figure, the operating capacity of the first compressor (1) is 100%, and the second and third compressors (2), (3)
When the operating capacities of both are set to 50%, and the opening time of the first solenoid valve (15) corresponding to the first compressor (1) is t time (for example, 1 minute), ,
The second and third solenoid valves (1 corresponding to the three compressors (2), (3)
The open time of 6) and (17) is t / 2 (for example, 30 seconds), which is half of the open time according to the ratio of the above operating capacities, and each solenoid valve (15), (16), (17) It is set to open every T time (for example, 5 minutes).

したがって、上記実施例においては、冷凍装置の作動
時、その圧縮機(1),(2),(3)の運転容量がそ
れぞれ第1、第2及び第3運転容量センサ(19),
(20),(21)によって検出され、この検出信号を
受けたコントローラ(18)により運転容量に応じて各
電磁弁(15),(16),(17)に制御信号が出力
される。そして、上述の如く、第1圧縮機(1)の運転
容量が100%で、第2,3圧縮機(2),(3)の運
転容量が共に50%であると想定して説明すると、大運
転容量の第1圧縮機(1)では小運転容量の第2、第3
圧縮機(2),(3)よりも油吐出量が多いことから、
稼動時間が経過するに従ってそのドーム(4)内の潤滑
油(A)の量は他の圧縮機(2),(3)のドーム
(4),(4)内よりも少なくなる。しかし、本実施例
の場合、第2図の開閉モードに示す如く、上記第1圧縮
機(1)と第2,第3圧縮機(2),(3)との運転容
量の大小に応じて、第1圧縮機(1)に対応する第1電
磁弁(15)の所定時間毎の開時間tは他の第2,3圧
縮機(2),(3)に対応する第2,3電磁弁(1
6),(17)の開時間t/2の2倍に設定されている
ので、第1圧縮機(1)のドーム(4)内への返油量が
他の第2,3圧縮機(2),(3)のドーム(4),
(4)内への返油量よりも多くなり、これにより、第1
圧縮機(1)内の潤滑油(A)の減少分が補われて各圧
縮機(1),(2),(3)内の油面の均一化を図るこ
とができる。
Therefore, in the above embodiment, the operating capacities of the compressors (1), (2) and (3) are respectively the first, second and third operating capacity sensors (19), when the refrigeration system is operating.
The controller (18) which receives the detection signal detected by (20) and (21) outputs a control signal to each solenoid valve (15), (16), (17) according to the operating capacity. As described above, assuming that the operating capacity of the first compressor (1) is 100% and the operating capacities of the second and third compressors (2) and (3) are both 50%, The first compressor (1) having a large operating capacity has the second and third compressors having a small operating capacity.
Since the oil discharge amount is larger than that of the compressors (2) and (3),
As the operating time elapses, the amount of lubricating oil (A) in the dome (4) becomes smaller than that in the dome (4), (4) of the other compressors (2), (3). However, in the case of the present embodiment, as shown in the opening / closing mode of FIG. 2, the operating capacity of the first compressor (1) and the second and third compressors (2), (3) is changed according to the operating capacity. , The opening time t of the first solenoid valve (15) corresponding to the first compressor (1) at predetermined time intervals is the second and third solenoids corresponding to the other second and third compressors (2) and (3). Valve (1
6) and (17) are set to twice as long as the opening time t / 2, the amount of oil returned to the dome (4) of the first compressor (1) is different from that of the other second and third compressors ( Dome (4) of 2), (3),
(4) It is larger than the amount of oil returned to the inside.
The reduced amount of the lubricating oil (A) in the compressor (1) is compensated for, and the oil level in each compressor (1), (2), (3) can be made uniform.

また、上述の如くして各圧縮機(1),(2),(3)
内の油面の均一化を図っても、各圧縮機(1),
(2),(3)における油吐出量、油戻り量あるいは吸
入圧損の量には微妙な差が生じるものと考えられる。し
たがって、この状態が長時間続くと、運転条件によって
は各圧縮機(1),(2),(3)の油面レベルの差が
増加し、各圧縮機(1),(2),(3)のドーム
(4)内に油量のアンバランスが生ずることとなる。こ
のことを防止するために、上記各圧縮機(1),
(2),(3)をその運転容量がコントローラ(18)
により予め設定された運転モード基づいて所定時間毎に
順次変化するように作動制御するようにしてもよい。す
なわち、これによれば、各圧縮機(1),(2),
(3)のドーム(4)内に油量のアンバランスが生じて
も、各圧縮機(1),(2),(3)の運転容量の変化
に基づくドーム内圧の差により各圧縮機(1),
(2),(3)のドーム(4)内に潤滑油(A)が均油
管(10),(10)を介して移動せしめられ、各圧縮
機(1),(2),(3)内における油面の均一化を確
実に図ることができる。
Further, as described above, each compressor (1), (2), (3)
Even if the internal oil level is made uniform, each compressor (1),
It is considered that there are subtle differences in the oil discharge amount, the oil return amount, or the suction pressure loss amount in (2) and (3). Therefore, if this state continues for a long time, the difference in oil level between the compressors (1), (2), and (3) increases depending on the operating conditions, and the compressors (1), (2), ( An imbalance of the oil amount will occur in the dome (4) of 3). In order to prevent this, each compressor (1),
Controllers (18) whose operating capacities are (2) and (3)
Therefore, the operation may be controlled so as to sequentially change at predetermined time intervals based on the operation mode set in advance. That is, according to this, each compressor (1), (2),
Even if the oil amount is unbalanced in the dome (4) of (3), each compressor (1), (2), (3) due to the difference in the dome internal pressure based on the change in the operating capacity of each compressor ( 1),
The lubricating oil (A) is moved into the dome (4) of (2) and (3) through the oil equalizing pipes (10) and (10), and the compressors (1), (2) and (3) are moved. It is possible to surely make the oil level in the inside uniform.

さらに、上記各油戻し管(12),(13),(14)
に電磁弁(15),(16),(17)をバイパスする
キャピラリを設けることにより、各電磁弁(15),
(16),(17)が故障しても各圧縮機(1),
(2),(3)に返油可能として各圧縮機(1),
(2),(3)の損傷を防止するようになすことも採用
可能である。なお、この場合においては、各電磁弁(1
5),(16),(17)が閉じているときでも各圧縮
機(1),(2),(3)には常時返油されることとな
るが、キャピラリのサイズを大運転容量側の圧縮機
(1),(2),(3)への油戻り量が小運転容量側よ
り僅かに上回るように設定すれば問題はない。
Further, the oil return pipes (12), (13), (14)
By providing a capillary for bypassing the solenoid valves (15), (16), (17) in each solenoid valve (15),
Even if (16) and (17) fails, each compressor (1),
Compressors (1), which can be returned to (2) and (3)
It is also possible to adopt a method of preventing the damage of (2) and (3). In this case, each solenoid valve (1
Even when 5), (16) and (17) are closed, oil is always returned to the compressors (1), (2) and (3), but the size of the capillary is set to the large operating capacity side. There is no problem if it is set so that the amount of oil returned to the compressors (1), (2), and (3) is slightly higher than that on the small operating capacity side.

(発明の効果) 以上説明したように、本発明によれば、複数基の可変容
量型圧縮機(1),(2),(3)を1系統の冷媒回路
に並列に接続してなる冷凍装置において、油分離器(1
1)で分離された圧縮機用潤滑油(A)を油戻し管(1
2),(13),(14)を介して圧縮機(1),
(2),(3)へ戻す際に、各油戻し管(12),(1
3),(14)の電磁弁(15),(16),(17)
を対応する各圧縮機(1),(2),(3)の運転容量
に従って運転容量が増大するほど所定時間毎の開時間が
長くなるように開閉制御したので、油吐出量が多い大運
転容量の圧縮機(1),(2),(3)への返油量を小
運転容量の圧縮機(1),(2),(3)よりも多くす
ることができ、よって圧縮機(1),(2),(3)内
における油量を確実に均一にすることができる。
(Effects of the Invention) As described above, according to the present invention, a refrigeration system in which a plurality of variable displacement compressors (1), (2) and (3) are connected in parallel to a single refrigerant circuit. In the device, the oil separator (1
The lubricating oil (A) for the compressor separated in 1) is returned to the oil return pipe (1
2), (13), (14) through the compressor (1),
When returning to (2) and (3), each oil return pipe (12), (1
3), (14) solenoid valves (15), (16), (17)
Since the open / close control is performed such that the opening time of each predetermined time becomes longer as the operating capacity increases in accordance with the operating capacity of each corresponding compressor (1), (2), (3), large operation with a large oil discharge amount. The amount of oil returned to the high-capacity compressors (1), (2), and (3) can be made larger than that of the small-operation-capacity compressors (1), (2), and (3). The amount of oil in 1), (2) and (3) can be surely made uniform.

また、このように各圧縮機(1),(2),(3)間の
均油を確実に行い得ることから、小径の均油管(10)
を用いることが可能で、大径の均油管を用いることによ
る両圧縮機への振動増大や均油管の強度低下の防止を図
ることができる。さらに、フロート式レギュレータや油
面センサ等の制御部品を要することなく各圧縮機
(1),(2),(3)の均油を行い得ることから、コ
ストの低減化および制御面における信頼性の向上をも図
ることができる。
In addition, since oil equalization between the compressors (1), (2), and (3) can be reliably performed in this manner, the oil equalizing pipe (10) having a small diameter is provided.
Can be used, and it is possible to prevent an increase in vibration of both compressors and a reduction in strength of the oil equalizing pipe due to the use of a large diameter oil equalizing pipe. Furthermore, since the compressors (1), (2), and (3) can be oil-equalized without requiring control parts such as a float type regulator and an oil level sensor, cost reduction and control reliability can be achieved. Can also be improved.

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

第1図は本発明の実施例に係る冷凍装置の概略構成図、
第2図は各圧縮機の運転容量変化に伴う各電磁弁の開閉
モードを示す図である。 (1)…第1圧縮機、(2)…第2圧縮機、(3)…第
3圧縮機、(4)…ドーム、(8)…吸入管、(9)…
吐出管、(10)…均油管、(11)…油分離器、(1
2)…第1油戻し管、(13)…第2油戻し管、(1
4)…第3油戻し管、(15)…第1電磁弁、(16)
…第2電磁弁、(17)…第3電磁弁、(18)…コン
トローラ、(A)……潤滑油。
FIG. 1 is a schematic configuration diagram of a refrigerating apparatus according to an embodiment of the present invention,
FIG. 2 is a diagram showing an opening / closing mode of each solenoid valve according to a change in operating capacity of each compressor. (1) ... 1st compressor, (2) ... 2nd compressor, (3) ... 3rd compressor, (4) ... Dome, (8) ... Suction pipe, (9) ...
Discharge pipe, (10) ... Oil leveling pipe, (11) ... Oil separator, (1
2) ... first oil return pipe, (13) ... second oil return pipe, (1
4) ... Third oil return pipe, (15) ... First solenoid valve, (16)
... second solenoid valve, (17) ... third solenoid valve, (18) ... controller, (A) ... lubricating oil.

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】吸入管(8)によりドーム(4)内に吸入
された冷媒ガスを圧縮して吐出管(9)により吐出させ
る複数基の可変容量型圧縮機(1),(2),(3)を
1系統の冷媒回路に並列に接続してなる冷凍装置におい
て、上記各圧縮機(1),(2),(3)のドーム
(4)内を潤滑油(A)の運転油面レベル位置にて互い
に連通する均油管(10),(10)と、上記吐出管
(9)により各圧縮機(1),(2),(3)のドーム
(4)外に吐出されて集合された冷媒ガスから潤滑油
(A)を分離する油分離器(11)と、この油分離器
(11)で分離された潤滑油(A)を上記各圧縮機
(1),(2),(3)のドーム(4)内にそれぞれ戻
す油戻し管(12),(13),(14)と、この各油
戻し管(12),(13),(14)を開閉する電磁弁
(15),(16),(17)と、該各電磁弁(1
5),(16),(17)を所定時間毎に開くように、
かつ該各電磁弁(15),(16),(17)を対応す
る各圧縮機(1),(2),(3)の運転容量に従って
各圧縮機(1),(2),(3)の運転容量が増大する
ほど所定時間毎の開時間が長くなるように開閉制御する
コントローラ(18)とを備えたことを特徴とする冷凍
装置。
1. A plurality of variable displacement compressors (1), (2), which compress a refrigerant gas sucked into a dome (4) by a suction pipe (8) and discharge it by a discharge pipe (9). In a refrigeration system in which (3) is connected in parallel to a single-system refrigerant circuit, the operating oil of lubricating oil (A) is placed inside the dome (4) of each of the compressors (1), (2), and (3). Discharged to the outside of the dome (4) of each compressor (1), (2), (3) by the oil equalizing pipes (10), (10) communicating with each other at the surface level position and the discharge pipe (9). The oil separator (11) for separating the lubricating oil (A) from the collected refrigerant gas, and the lubricating oil (A) separated by the oil separator (11) are used as the compressors (1), (2). , Oil return pipes (12), (13), and (14) returning to the dome (4) of (3), and the oil return pipes (12), (13), and (1), respectively. ) Solenoid valve for opening and closing (15), (16), and (17), each of said solenoid valves (1
5), (16), and (17) are opened every predetermined time,
Moreover, the compressors (1), (2) and (3) are operated according to the operating capacities of the compressors (1), (2) and (3) corresponding to the solenoid valves (15), (16) and (17). ), The controller (18) for controlling the opening and closing so that the opening time of each predetermined time becomes longer as the operating capacity increases.
JP22751685A 1985-10-11 1985-10-11 Refrigeration equipment Expired - Lifetime JPH063324B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP22751685A JPH063324B2 (en) 1985-10-11 1985-10-11 Refrigeration equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP22751685A JPH063324B2 (en) 1985-10-11 1985-10-11 Refrigeration equipment

Publications (2)

Publication Number Publication Date
JPS6287771A JPS6287771A (en) 1987-04-22
JPH063324B2 true JPH063324B2 (en) 1994-01-12

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ID=16862123

Family Applications (1)

Application Number Title Priority Date Filing Date
JP22751685A Expired - Lifetime JPH063324B2 (en) 1985-10-11 1985-10-11 Refrigeration equipment

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JP2605498B2 (en) * 1991-03-18 1997-04-30 ダイキン工業株式会社 Combined compression device
JP4300804B2 (en) * 2002-06-11 2009-07-22 ダイキン工業株式会社 Oil leveling circuit of compression mechanism, heat source unit of refrigeration apparatus, and refrigeration apparatus including the same

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