JPS60222585A - Screw compressor - Google Patents

Abstract

PURPOSE:To reduce the dimension of an oil separator and remove an oil cooler by setting the discharge temperature of a screw refrigerator at about 100 deg.C and reducing the amount of oil. CONSTITUTION:The inhaled gas flows into a screw compressor 1 from a suction pipe 3, and the pressure is increased here. After the oil separated by an oil separator 2 lubricates a bearing in pressure increasing process, the oil is inhaled into the suction side toothed groove space of a rotor and used for gas sealing. The discharged gas is separared into oil and gas by the oil separator 2, and the gas is sent-out into a condenser through a connection pipe 5, and the oil is supplied into the compressor 1 through an oil feeding pipe 6. Since operation is performed so that the discharge temperature becomes about 100 deg.C higher than that in the conventional, an oil cooler can be removed, and the amount of lubricating oil for cooling and sealing can be reduced, and the reduction of the dimension of the oil separator can be achieved.

Description

【発明の詳細な説明】 〔発明の利用分野） 本発明はスクリュー圧縮機の改良に係り、特に空調用と
して使用する場合の油サイクルの簡略化に関するもので
ある。DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to an improvement in a screw compressor, and particularly to the simplification of an oil cycle when used for air conditioning.

〔発明の背景〕[Background of the invention]

従来のスクリュー圧縮機は圧縮ガスの冷却、およびシー
ル、ロータ歯面の潤滑のため多量の冷却した油をロータ
鑑溝に供給している。そのため吐出ガス中の油を分離す
るためのセパレータが大形化し、油の冷却をするための
油冷却器も大容量のものを必要とする。Conventional screw compressors supply a large amount of cooled oil to the rotor guide grooves for cooling the compressed gas and for lubricating seals and rotor tooth surfaces. Therefore, the separator for separating the oil in the discharged gas becomes large in size, and the oil cooler for cooling the oil also needs to have a large capacity.

さらにまた、ロータ歯溝に油を多量に供給するため、容
ｔＩｉＭ！整弁およびケーシングへの油供給穴を複雑に
加工する必要がある。Furthermore, since a large amount of oil is supplied to the rotor tooth groove, the capacity is tIiM! The oil supply hole to the valve regulator and casing must be machined in a complicated manner.

〔発明の目的〕[Purpose of the invention]

本発明はセパレータの小形化をはかシ、油冷却器をなく
しかつケーシング等の油供給穴の加工をなくすことによ
υシンプルな油系統とし、ユニット全体としての小形化
をはかる事金目的とする。The purpose of the present invention is to reduce the size of the separator, eliminate the oil cooler, and eliminate the machining of oil supply holes in the casing, etc. to create a simple oil system, and to reduce the size of the entire unit. do.

〔発明の概要〕[Summary of the invention]

上記目的を達成するため本発明は、圧縮機への油供給を
必要最小限にして効率を低下させる事なく、セパレータ
等の補益を小形化するとともに油系統をシンプルにして
ユニット全体を小形化せんとするものである。In order to achieve the above object, the present invention minimizes the oil supply to the compressor without reducing efficiency, downsizes the supplementary parts such as separators, and simplifies the oil system to downsize the entire unit. That is.

〔発明の実施例〕[Embodiments of the invention]

以下本発明の実施例を図面に基づき説明する。 Embodiments of the present invention will be described below based on the drawings.

ｉｌｌスクリュー圧縮機、２は油セパレータ、３は吸入
管、４は吐出管、５はコンデンサへの接続管、６は油供
給管である。ill screw compressor, 2 is an oil separator, 3 is a suction pipe, 4 is a discharge pipe, 5 is a connection pipe to a condenser, and 6 is an oil supply pipe.

吸入ガスは吸入管１からスクリュー圧縮機２へ流入しこ
こで昇圧される。この昇圧行程では油セパレータ２でセ
パレートされた油が軸受を潤滑した後ロータの吸入側歯
溝空間へ吸い込まれ、ガスのシール作用をせしめる。昇
圧されたガスは吐出管４を経て油セパレータ２へ流入す
る。ここで油とガスは分離し、ガスは接続管５を経てコ
ンデンサへ吐出され、油は油供給管６を通って圧縮機へ
供給される。Suction gas flows into the screw compressor 2 from the suction pipe 1 and is pressurized there. In this pressure increasing stroke, the oil separated by the oil separator 2 lubricates the bearing and is then sucked into the tooth space on the suction side of the rotor to provide a gas sealing effect. The pressurized gas flows into the oil separator 2 via the discharge pipe 4. Here, the oil and gas are separated, the gas being discharged through the connecting pipe 5 to the condenser, and the oil being supplied through the oil supply pipe 6 to the compressor.

圧縮機へ供給される油の粘度は１００’Ｃにおいて２乃
至Ｉ　Ｑ　、Ｑ　ｃｓｔの粘度を有するのが効率を維持
する上で必要な条件であ１，２ｃｓｔ以下の粘度の油を
使用すると油膜の破断力が低下するためシール効果が蓄
しく減少し効率？維持するのがむつかしい。The viscosity of the oil supplied to the compressor is 2 to I Q , Q cst at 100'C, which is a necessary condition to maintain efficiency. If oil with a viscosity of 1.2 cst or less is used, an oil slick will occur. Since the breaking force of the seal decreases, the sealing effect decreases and the efficiency decreases. Difficult to maintain.

反ｓ　ｔ　ｏ　ｏ　ｃｓｔ以上の油では圧縮機の内部で
の油の流動性が悪化するとともに油膜破断力が大きくな
りすぎ圧縮機駆動系統の損失が大きくなりすぎかえって
効率が低下する。If the oil exceeds s to o cst, the fluidity of the oil inside the compressor deteriorates, and the oil film rupture force becomes too large, resulting in too large a loss in the compressor drive system, and on the contrary, the efficiency decreases.

圧縮ガスのシールには、実験結果によると、吸入ガス量
の０．１％〜１９６の体積流量化の油が、必要不可欠で
ある事が解明された。この量は運転条件にはあまシ左右
される事はない。一方、圧縮機の駆動系の潤滑には通常
軸受の場合圧縮機のキャパシティーによっても異なるが
、吸入ガス量の体積化で０．０２〜３％の油が必要であ
ることが解明された。すなわち、軸受必要量と圧縮ガス
のシールに必要な量ははｙ同等である。According to experimental results, it has been found that oil with a volumetric flow rate of 0.1% to 196% of the amount of suction gas is essential for sealing compressed gas. This amount is not affected by operating conditions. On the other hand, it has been found that in the case of normal bearings, 0.02 to 3% oil is required based on the volume of suction gas to lubricate the drive system of the compressor, although this varies depending on the capacity of the compressor. That is, the amount required for the bearing and the amount required for sealing the compressed gas are equal to y.

さらにまた重要なことは冷凍機の場合、吐出ガスの温度
が高ければ高い程効率が高くなる事である。すなわち同
一圧力条件下においては温度が高い種油の溶解度が小さ
く、そのため低圧側での沸とうに伴なう冷媒の再蒸発量
が少なくなるためである。What is also important is that in the case of a refrigerator, the higher the temperature of the discharged gas, the higher the efficiency. That is, under the same pressure conditions, the solubility of the seed oil with a high temperature is low, and therefore the amount of re-evaporation of the refrigerant accompanying boiling on the low pressure side is reduced.

従来のスクリュー冷凍機は吐出温度を低くし、かつ多量
の油を供給する事により効率を維持する事が正論であっ
たが、吐出温度’ｋ１００’ｃ前後に高め、かつ油量ｔ
ｇＴ事によりさらに性能向上がはかれ、これによシ油セ
パレータの小形化、油冷却器の省略がはかれる事が明白
である。In conventional screw refrigerators, it was natural to maintain efficiency by lowering the discharge temperature and supplying a large amount of oil.
It is clear that the performance is further improved by gT, which allows the oil separator to be made smaller and the oil cooler to be omitted.

〔発明の効果〕〔Effect of the invention〕

本発明によれば、圧縮機への供給油量は軸受への給油量
のみでまかなえるのでサイクルへ附設する油セパレータ
は小形のもので十分効果が期待できる。According to the present invention, the amount of oil supplied to the compressor can be covered only by the amount of oil supplied to the bearings, so even a small oil separator attached to the cycle can be expected to be sufficiently effective.

また油量の減少によシ封入油量も少なくてすむし、圧縮
機として余分な油を送給する必要もなく消費動力も減少
する。Furthermore, since the amount of oil is reduced, the amount of oil sealed in the compressor is also reduced, and there is no need to supply excess oil to the compressor, which reduces power consumption.

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

図は本発明の一実施例を示すサイクル系統図である。 １・・・スクリュー圧縮機　２・・・油セパレータ６・
・・油供給管The figure is a cycle system diagram showing one embodiment of the present invention. 1... Screw compressor 2... Oil separator 6.
・・Oil supply pipe

Claims (1)

【特許請求の範囲】[Claims] 冷凍機油にて潤滑およびシールの作用を行わしめるスク
リュー圧縮機において、この冷凍機油の積置が１００°
Ｃにおいて２乃至Ｉ　Ｑ　Ｑ　ｃｓｔであり、かつ吐出
ガスから分離した油は強制冷却される事なく圧縮機へ供
給され、この供給された油はすべて軸受を経由した後吸
入ガスとともにロータ歯溝間へ吸入される事を特徴とす
るスクリュー圧縮機。In a screw compressor that uses refrigeration oil for lubrication and sealing, the accumulation of refrigeration oil is 100°.
2 to I Q Q cst at C, and the oil separated from the discharge gas is supplied to the compressor without being forcedly cooled, and all of this supplied oil passes through the bearing and then flows between the teeth of the rotor together with the suction gas. A screw compressor characterized by suction into the air.