JPH07180917A - Screw tube refrigerator - Google Patents
Screw tube refrigeratorInfo
- Publication number
- JPH07180917A JPH07180917A JP32738993A JP32738993A JPH07180917A JP H07180917 A JPH07180917 A JP H07180917A JP 32738993 A JP32738993 A JP 32738993A JP 32738993 A JP32738993 A JP 32738993A JP H07180917 A JPH07180917 A JP H07180917A
- Authority
- JP
- Japan
- Prior art keywords
- motor
- refrigerant
- screw
- compressor
- expansion 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.)
- Granted
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
- F25B2400/13—Economisers
Landscapes
- Applications Or Details Of Rotary Compressors (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は、スクリュ圧縮機駆動用
のモータを冷媒で冷却するタイプのスクリュ式冷凍機に
関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screw type refrigerator in which a motor for driving a screw compressor is cooled by a refrigerant.
【0002】[0002]
【従来の技術】従来、半密閉型スクリュ圧縮機駆動用の
モータを冷媒で冷却するタイプのスクリュ式冷凍機は公
知であり、特開平1−237389号公報,特開平1−
273894号公報に開示されている。特開平1−23
7389号公報では、スクリュ圧縮機駆動用モータを圧
縮機の吸込部に配置し、吸込み冷媒ガスを、モータのス
テータ部に導き、ロータ室に吸込ませて、モータを冷却
するようにした1段型の半密閉型スクリュ圧縮機を採用
したスクリュ式冷凍機が開示されている。2. Description of the Related Art Conventionally, a screw type refrigerator of a type in which a motor for driving a semi-hermetic screw compressor is cooled by a refrigerant is known, and is disclosed in Japanese Patent Laid-Open Nos. 1-237389 and 1-237.
It is disclosed in Japanese Patent No. 273894. Japanese Patent Laid-Open No. 1-23
In the 7389 publication, a screw compressor driving motor is arranged in a suction portion of a compressor, and a suction refrigerant gas is guided to a stator portion of the motor to be sucked into a rotor chamber to cool the motor. Discloses a screw type refrigerator employing the semi-hermetic screw compressor.
【0003】特開平1−273894号公報では、2段
型の半密閉型スクリュ圧縮機を採用したスクリュ式冷凍
機が開示されており、そこでは、低圧段側圧縮機の吐出
口と高圧段側圧縮機の吸込口との間に圧縮機駆動用のモ
ータを配置して、そのステータ部を上記吐出口からの冷
媒ガスが通過するようにしてある。Japanese Unexamined Patent Publication No. 1-273894 discloses a screw type refrigerator using a two-stage semi-hermetic screw compressor, in which the discharge port of the low-pressure stage compressor and the high-pressure stage side are disclosed. A motor for driving the compressor is arranged between the suction port of the compressor and the stator so that the refrigerant gas from the discharge port passes therethrough.
【0004】[0004]
【発明が解決しようとする課題】上記従来のスクリュ式
冷凍機のうち、特開平1−237389号公報に記載の
ものの場合、蒸発器でガス化した冷媒は、モータを冷却
するが、冷媒ガス側から見れば過熱される。そして、過
熱された分だけ、冷媒ガスは膨張してロータ室に吸込ま
れるため、膨張した分だけロータ室への吸込効率が悪く
なるというという問題が生じる。Among the conventional screw type refrigerators described in JP-A-1-237389, the refrigerant gasified in the evaporator cools the motor, but the refrigerant gas side. Seen from above, it is overheated. Then, since the refrigerant gas expands and is sucked into the rotor chamber by the amount of overheating, there is a problem that the suction efficiency into the rotor chamber is deteriorated by the expanded amount.
【0005】また、特開平1−237389号公報に記
載のものでは、圧縮機の吸込効率は、上記のもの程悪く
はならないが、高圧段側のロータ室への吸込効率が低下
し、この結果、低圧段と高圧段の間の中間圧力が高くな
る。このため、低圧段側圧縮機本体の圧縮比が高くな
り、その影響で低圧段側の吸込効率が低くなるという問
題が生じる。本発明は、斯る従来の問題点を課題として
なされたもので、圧縮機駆動用モータを冷媒で冷却し、
かつ吸込効率の低下防止を可能としたスクリュ式冷凍機
を提供しようとするものである。Further, in the one disclosed in Japanese Patent Laid-Open No. 1-237389, the suction efficiency of the compressor is not so bad as that described above, but the suction efficiency to the rotor chamber on the high pressure stage side is lowered, and as a result, The intermediate pressure between the low pressure stage and the high pressure stage becomes high. Therefore, the compression ratio of the low-pressure stage side compressor main body becomes high, which causes a problem that the suction efficiency at the low-pressure stage side becomes low. The present invention has been made to solve the above conventional problems, and cools a compressor driving motor with a refrigerant,
Moreover, it is an object of the present invention to provide a screw type refrigerator capable of preventing a decrease in suction efficiency.
【0006】[0006]
【課題を解決するための手段】上記課題を解決するため
に、本発明は、1段或は複数段のスクリュ式圧縮機の他
に、少なくとも凝縮器,第一膨張弁,蒸発器を含む冷媒
の循環閉流路を備えるとともに、上記スクリュ圧縮機を
駆動するモータを上記冷媒で冷却する冷却用流路を備え
たスクリュ式冷凍機において、上記冷却用流路を、上記
第一膨張弁の入口側にて上記循環閉流路から分岐させ、
第二膨張弁を経て上記モータに至らせ、上記モータ内を
通過させ、上記凝縮器に冷媒を送り出すスクリュ圧縮機
の吸込口および吐出口に連通することのないガス閉込み
空間に連通させて形成した。In order to solve the above problems, the present invention provides a refrigerant including at least a condenser, a first expansion valve, and an evaporator in addition to a one-stage or multiple-stage screw compressor. In a screw type refrigerator having a circulation closed flow passage and a cooling flow passage for cooling the motor for driving the screw compressor with the refrigerant, the cooling flow passage is provided at the inlet of the first expansion valve. Branch from the circulation closed flow path on the side,
Formed by communicating with a gas confined space that does not communicate with the suction port and the discharge port of a screw compressor that passes through the second expansion valve to the motor, passes through the motor, and sends the refrigerant to the condenser. did.
【0007】[0007]
【作用】上記発明のように構成することにより、モータ
冷却による冷媒ガスの過熱の影響が吸込み冷媒ガスに及
ばなくなる。With the configuration as described above, the influence of overheating of the refrigerant gas due to motor cooling does not affect the sucked refrigerant gas.
【0008】[0008]
【実施例】次に、本発明の一実施例を図面にしたがって
説明する。図1は、本発明の第一実施例に係るスクリュ
式冷凍機を示し、低圧段側のスクリュ圧縮機1,高圧段
側のスクリュ圧縮機2,凝縮器3,エコノマイザ4,第
一膨張弁5、および蒸発器6を含む冷媒用の循環閉流路
7と、第一膨張弁5の入口側にて循環閉流路7から分岐
させ、第二膨張弁8を経て、スクリュ圧縮機1,2駆動
用モータ9に至らせ、モータ9内のステータ部を通過さ
せ、高圧段側のスクリュ圧縮機2の吸込口および吐出口
に連通することのないガス閉込み空間に連通させた冷却
用流路10とが設けてある。なお、本実施例では、スク
リュ圧縮機1,2およびモータ9は、一体的に形成した
半密閉型のものである。An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a screw refrigerator according to a first embodiment of the present invention, which includes a low-pressure stage screw compressor 1, a high-pressure stage screw compressor 2, a condenser 3, an economizer 4, and a first expansion valve 5. , And the circulation closed flow path 7 for the refrigerant including the evaporator 6, and the circulation closed flow path 7 on the inlet side of the first expansion valve 5 and branched from the closed flow path 7 through the second expansion valve 8 to the screw compressor 1, A cooling flow path reaching the drive motor 9 and passing through a stator portion in the motor 9 and communicating with a gas confining space that does not communicate with the suction port and the discharge port of the screw compressor 2 on the high pressure stage side. And 10 are provided. In this embodiment, the screw compressors 1 and 2 and the motor 9 are of a semi-hermetic type integrally formed.
【0009】また、凝縮器3の出口側にて循環閉流路7
から分岐させ、第三膨張弁11を経て、エコノマイザ4
内の冷媒と熱交換可能にこのエコノマイザ4を通過さ
せ、循環閉流路7の一部であるスクリュ圧縮機1,2間
の中間流路7aに合流させた中間冷却用流路12が設け
てある。さらに、蒸発器6の出口側の循環閉流路7,モ
ータ9とスクリュ圧縮機2との間の流路10、およびエ
コノマイザ4と中間流路7aとの間の流路12に感温筒
13,14、および15が取り付けてある。この感温筒
13,14、および15は、それぞれの箇所の温度,圧
力を検出して、検出部での過熱度が一定になるように第
一,第二,第三膨張弁5,8,11の開度を調節するも
のである。A closed circulation channel 7 is provided on the outlet side of the condenser 3.
From the first expansion valve 11 to the economizer 4
There is provided an intermediate cooling flow passage 12 which is passed through the economizer 4 so as to be able to exchange heat with the refrigerant inside and is joined to the intermediate flow passage 7a between the screw compressors 1 and 2 which is a part of the closed circulation flow passage 7. is there. Further, the temperature-sensing cylinder 13 is provided in the closed circulation flow path 7 on the outlet side of the evaporator 6, the flow path 10 between the motor 9 and the screw compressor 2, and the flow path 12 between the economizer 4 and the intermediate flow path 7a. , 14, and 15 are attached. The temperature-sensitive cylinders 13, 14, and 15 detect the temperature and pressure at their respective locations, and the first, second, and third expansion valves 5, 8, so that the degree of superheat in the detection section becomes constant. The opening degree of 11 is adjusted.
【0010】そして、上記のように構成することによ
り、エコノマイザ4内で冷却された流路7の冷媒液を、
第二膨張弁8により気化させて、温度降下させた後、モ
ータ9内に送り、これを冷却するように形成してある。
さらに、モータ9を冷却して昇温した冷媒ガスを高圧段
側のスクリュ圧縮機2のガス閉込み空間に導いて、流路
7を循環する冷媒ガスと合流させてある。このように、
モータ9を冷却して、昇温した冷媒ガスを高圧段側のス
クリュ圧縮機2のガス閉込み空間に送り込んでいるた
め、両圧縮機の吸込みに何等影響を及ぼすことはなく、
モータ9からの冷媒ガスによる圧縮機の吸込効率の低下
防止が可能となっている。With the above configuration, the refrigerant liquid in the flow path 7 cooled in the economizer 4 is
After being vaporized by the second expansion valve 8 to lower the temperature, it is sent into the motor 9 to be cooled.
Further, the refrigerant gas, which has been cooled by heating the motor 9 and has been heated, is introduced into the gas confined space of the screw compressor 2 on the high pressure stage side and merged with the refrigerant gas circulating in the flow path 7. in this way,
Since the motor 9 is cooled and the heated refrigerant gas is sent into the gas confined space of the screw compressor 2 on the high pressure stage side, there is no effect on the suction of both compressors.
It is possible to prevent the suction efficiency of the compressor from being lowered by the refrigerant gas from the motor 9.
【0011】図2は、本発明の第二実施例に係るスクリ
ュ式冷凍機を示し、図1に示すスクリュ式冷凍機と共通
する部分については、互いに同一番号を付して説明を省
略する。本実施例では、スクリュ圧縮機21の1段だけ
設けてあり、また図1に示すスクリュ冷凍機におけるエ
コノマイザ4、流路12,第三膨張弁11、および感温
筒15は設けていない。また、本実施例ではスクリュ圧
縮機21およびモータ9は一体的に形成した半密閉型の
ものである。FIG. 2 shows a screw refrigerating machine according to a second embodiment of the present invention. The parts common to those of the screw refrigerating machine shown in FIG. In this embodiment, only one stage of the screw compressor 21 is provided, and the economizer 4, the flow path 12, the third expansion valve 11 and the temperature sensing cylinder 15 in the screw refrigerator shown in FIG. 1 are not provided. Further, in this embodiment, the screw compressor 21 and the motor 9 are of a semi-hermetic type integrally formed.
【0012】そして、斯る構成により凝縮器3を出た冷
媒液を第二膨張弁8により気化させて、温度降下させた
後、モータ9内のステータ部に送り、これを冷却するよ
うに形成してある。さらに、モータ9を冷却して昇温し
た冷媒ガスをスクリュ圧縮機21のガス閉込み空間に導
いて、流路7を循環する冷媒ガスと合流させてある。こ
のように、上記同様に、モータ9を冷却して、昇温した
冷媒ガスをスクリュ圧縮機2のガス閉込み空間に送り込
んでいるため、圧縮機の吸込みに何等影響を及ぼすこと
はなく、モータ9からの冷媒ガスによる圧縮機の吸込効
率の低下防止が可能となっている。With this structure, the refrigerant liquid discharged from the condenser 3 is vaporized by the second expansion valve 8 to lower the temperature, and then sent to the stator portion in the motor 9 to cool it. I am doing it. Further, the refrigerant gas which has cooled the motor 9 and has been heated is introduced into the gas confined space of the screw compressor 21 and merged with the refrigerant gas circulating in the flow path 7. In this way, similarly to the above, since the motor 9 is cooled and the heated refrigerant gas is sent into the gas confined space of the screw compressor 2, the suction of the compressor is not affected at all, and the motor is not affected. It is possible to prevent the suction efficiency of the compressor from being deteriorated by the refrigerant gas from 9.
【0013】なお、本発明は、1段、或は2段にスクリ
ュ圧縮機を設けたものに限定するものでなく、3段以上
にスクリュ圧縮機を設けたものであってもよい。また、
複数段にスクリュ圧縮機を設けたものにおいては、各段
のスクリュロータの軸をカップリングを介して結合し、
一台のモータで各圧縮機を駆動するようにしてもよく、
或はスクリュロータの軸に歯車を取り付け、必要に応じ
てこれ以外の歯車を介在させて、一台のモータで各圧縮
機を駆動するようにしてもよい。さらに、凝縮器3につ
いては、受液器と一体型か分離型かは問わない。The present invention is not limited to the one in which the screw compressors are provided in one stage or two stages, and the screw compressors may be provided in three or more stages. Also,
In the case where screw compressors are provided in multiple stages, the shafts of the screw rotors in each stage are connected via couplings,
You may drive each compressor with one motor,
Alternatively, a gear may be attached to the shaft of the screw rotor, and if necessary, other gears may be interposed to drive each compressor with one motor. Further, the condenser 3 may be either integrated with the liquid receiver or separated.
【0014】[0014]
【発明の効果】以上の説明より明らかなように、本発明
によれば、1段或は複数段のスクリュ式圧縮機の他に、
少なくとも凝縮器,第一膨張弁,蒸発器を含む冷媒の循
環閉流路を備えるとともに、上記スクリュ圧縮機を駆動
するモータを上記冷媒で冷却する冷却用流路を備えたス
クリュ式冷凍機において、上記冷却用流路を、上記第一
膨張弁の入口側にて上記循環閉流路から分岐させ、第二
膨張弁を経て上記モータに至らせ、上記モータ内を通過
させ、上記凝縮器に冷媒を送り出すスクリュ圧縮機の吸
込口および吐出口に連通することのないガス閉込み空間
に連通させて形成してある。As is apparent from the above description, according to the present invention, in addition to the single-stage or multiple-stage screw type compressor,
At least a condenser, a first expansion valve, a screw-type refrigerator having a circulation closed flow path of a refrigerant including an evaporator, and a cooling flow path for cooling a motor for driving the screw compressor with the refrigerant, The cooling flow path is branched from the closed circulation flow path on the inlet side of the first expansion valve, reaches the motor through the second expansion valve, passes through the motor, and is cooled by the condenser. Is formed so as to communicate with a gas confined space that does not communicate with the suction port and the discharge port of the screw compressor for sending out.
【0015】このため、圧縮機駆動用モータの冷却によ
る冷媒ガスの過熱の影響が吸込み冷媒ガスに及ばなくな
り、冷媒によるモータの冷却とともに、圧縮機の吸込効
率の低下防止が可能になるという効果を奏する。For this reason, the influence of overheating of the refrigerant gas due to the cooling of the compressor driving motor does not affect the suction refrigerant gas, and it is possible to cool the motor by the refrigerant and prevent the suction efficiency of the compressor from decreasing. Play.
【図1】 本発明の第一実施例に係るスクリュ冷凍機の
全体構成を示す図である。FIG. 1 is a diagram showing an overall configuration of a screw refrigerator according to a first embodiment of the present invention.
【図2】 本発明の第二実施例に係るスクリュ冷凍機の
全体構成を示す図である。FIG. 2 is a diagram showing an overall configuration of a screw refrigerator according to a second embodiment of the present invention.
1,2 スクリュ圧縮機 3 凝縮器 5 第一膨張弁 7 循環閉流路 8 第二膨張弁 9 モータ 10 流路 21 スクリュ圧
縮機1, 2 screw compressor 3 condenser 5 first expansion valve 7 circulation closed flow path 8 second expansion valve 9 motor 10 flow path 21 screw compressor
Claims (1)
に、少なくとも凝縮器,第一膨張弁,蒸発器を含む冷媒
の循環閉流路を備えるとともに、上記スクリュ圧縮機を
駆動するモータを上記冷媒で冷却する冷却用流路を備え
たスクリュ式冷凍機において、上記冷却用流路を、上記
第一膨張弁の入口側にて上記循環閉流路から分岐させ、
第二膨張弁を経て上記モータに至らせ、上記モータ内を
通過させ、上記凝縮器に冷媒を送り出すスクリュ圧縮機
の吸込口および吐出口に連通することのないガス閉込み
空間に連通させて形成したことを特徴とするスクリュ式
冷凍機。1. In addition to a single-stage or multiple-stage screw compressor, a refrigerant circulation closed flow passage including at least a condenser, a first expansion valve, and an evaporator is provided, and the screw compressor is driven. In a screw type refrigerator having a cooling flow path for cooling a motor with the refrigerant, the cooling flow path is branched from the circulation closed flow path at the inlet side of the first expansion valve,
Formed by communicating with a gas confined space that does not communicate with the suction port and the discharge port of a screw compressor that passes through the second expansion valve to the motor, passes through the motor, and sends the refrigerant to the condenser. A screw type refrigerator characterized in that
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP32738993A JP3443443B2 (en) | 1993-12-24 | 1993-12-24 | Screw refrigerator |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP32738993A JP3443443B2 (en) | 1993-12-24 | 1993-12-24 | Screw refrigerator |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH07180917A true JPH07180917A (en) | 1995-07-18 |
JP3443443B2 JP3443443B2 (en) | 2003-09-02 |
Family
ID=18198610
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP32738993A Expired - Fee Related JP3443443B2 (en) | 1993-12-24 | 1993-12-24 | Screw refrigerator |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP3443443B2 (en) |
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US7640762B2 (en) | 2003-09-05 | 2010-01-05 | Daikin Industries, Ltd. | Refrigeration apparatus |
JP2010210146A (en) * | 2009-03-10 | 2010-09-24 | Mitsubishi Heavy Ind Ltd | Air heat source turbo heat pump |
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CN110925198A (en) * | 2019-11-01 | 2020-03-27 | 山东佳利略能源科技有限公司 | Multistage air supply screw compressor with economizer loop |
CN112334718A (en) * | 2018-10-03 | 2021-02-05 | 开利公司 | Method and system for cooling a motor during motor start-up |
WO2021166494A1 (en) * | 2020-02-20 | 2021-08-26 | 株式会社デンソー | Refrigeration cycle device |
JP2021131220A (en) * | 2020-02-20 | 2021-09-09 | 株式会社デンソー | Refrigeration cycle device |
-
1993
- 1993-12-24 JP JP32738993A patent/JP3443443B2/en not_active Expired - Fee Related
Cited By (17)
Publication number | Priority date | Publication date | Assignee | Title |
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US7640762B2 (en) | 2003-09-05 | 2010-01-05 | Daikin Industries, Ltd. | Refrigeration apparatus |
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CN107560041B (en) * | 2017-09-13 | 2020-12-04 | 重庆美的通用制冷设备有限公司 | Water chilling unit |
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CN110925198A (en) * | 2019-11-01 | 2020-03-27 | 山东佳利略能源科技有限公司 | Multistage air supply screw compressor with economizer loop |
CN110925198B (en) * | 2019-11-01 | 2021-01-01 | 山东佳利略能源科技有限公司 | Air-supplementing screw compressor with economizer loop |
WO2021166494A1 (en) * | 2020-02-20 | 2021-08-26 | 株式会社デンソー | Refrigeration cycle device |
JP2021131220A (en) * | 2020-02-20 | 2021-09-09 | 株式会社デンソー | Refrigeration cycle device |
CN115151767A (en) * | 2020-02-20 | 2022-10-04 | 株式会社电装 | Refrigeration cycle device |
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