JP6778126B2 - Vertical refueling screw compressor - Google Patents

Vertical refueling screw compressor Download PDF

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JP6778126B2
JP6778126B2 JP2017024218A JP2017024218A JP6778126B2 JP 6778126 B2 JP6778126 B2 JP 6778126B2 JP 2017024218 A JP2017024218 A JP 2017024218A JP 2017024218 A JP2017024218 A JP 2017024218A JP 6778126 B2 JP6778126 B2 JP 6778126B2
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rotor
discharge side
side bearing
suction
oil
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JP2018131916A (en
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美奈子 金田
美奈子 金田
紘太郎 千葉
紘太郎 千葉
土屋 豪
豪 土屋
正彦 高野
正彦 高野
謙次 森田
謙次 森田
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Hitachi Industrial Equipment Systems Co Ltd
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Hitachi Industrial Equipment Systems Co Ltd
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Description

本発明は、スクリューロータの回転軸が鉛直方向に延在する縦型で、且つ作動室、吸入側軸受、及び吐出側軸受に油を供給する給油式のスクリュー圧縮機に関する。 The present invention relates to a vertical type screw compressor in which the rotation axis of the screw rotor extends in the vertical direction, and a refueling type screw compressor that supplies oil to the working chamber, the suction side bearing, and the discharge side bearing.

特許文献1は、縦型給油式スクリュー圧縮機を開示する。このスクリュー圧縮機は、回転軸が互いに平行で、互いに噛み合いながら回転する雌雄一対のスクリューロータと、スクリューロータを収納するケーシングとを備えている。スクリューロータの回転軸は、鉛直方向に延在している。 Patent Document 1 discloses a vertical lubrication type screw compressor. This screw compressor includes a pair of male and female screw rotors whose rotation axes are parallel to each other and rotate while meshing with each other, and a casing for accommodating the screw rotors. The axis of rotation of the screw rotor extends in the vertical direction.

ケーシングは、スクリューロータの歯部を収納してそれらの歯溝に複数の作動室を形成するとともに、吸入口及び吐出口を有している。ロータの回転に伴い、作動室は、下方向に移動するとともに、その容積が変化する。これにより、作動室は、吸入ポートを介し吸入口から空気を吸入する吸入過程と、気体を圧縮する圧縮過程と、吐出ポートを介し吐出口に圧縮気体を吐出する吐出過程を行うようになっている。 The casing accommodates the tooth portions of the screw rotor to form a plurality of operating chambers in the tooth grooves thereof, and also has a suction port and a discharge port. As the rotor rotates, the working chamber moves downward and its volume changes. As a result, the operating chamber has come to perform a suction process of sucking air from the suction port through the suction port, a compression process of compressing the gas, and a discharge process of discharging the compressed gas to the discharge port through the discharge port. There is.

各ロータは、大別して、螺旋状の歯を有する歯部と、歯部の吸入側(上側)に接続された吸入側軸部と、歯部の吐出側(下側)に接続された吐出側軸部とで構成されている。各ロータの吸入側軸部は吸入側軸受で回転可能に支持され、各ロータの吐出側軸部は吐出側軸受で回転可能に支持されている。ロータの吐出側軸部及び吐出側軸受は、ケーシングの吐出側軸受室に収納されている。 Each rotor is roughly divided into a tooth portion having spiral teeth, a suction side shaft portion connected to the suction side (upper side) of the tooth portion, and a discharge side connected to the discharge side (lower side) of the tooth portion. It is composed of a shaft part. The suction side shaft portion of each rotor is rotatably supported by the suction side bearing, and the discharge side shaft portion of each rotor is rotatably supported by the discharge side bearing. The discharge side shaft portion and the discharge side bearing of the rotor are housed in the discharge side bearing chamber of the casing.

そして、作動室のシール、圧縮空気の冷却、及びロータの潤滑等を目的として、作動室に油が供給されるようになっている。また、吸入側軸受及び吐出側軸受の潤滑を目的として、吸入側軸受及び吐出側軸受にも油が供給されるようになっている。 Then, oil is supplied to the working chamber for the purpose of sealing the working chamber, cooling the compressed air, lubricating the rotor, and the like. Further, for the purpose of lubricating the suction side bearing and the discharge side bearing, oil is also supplied to the suction side bearing and the discharge side bearing.

国際公開第2016/157447号International Publication No. 2016/157447

特許文献1には明確に記載されていないものの、吸入側軸受に供給された油は作動室に流出する。作動室に供給された油の一部は吐出側軸受室に流出し、残りの油は圧縮空気とともに吐出口に吐出される。そのため、吸入側軸受及び作動室に供給された油の一部は、最終的に、吐出側軸受に供給された油と共に、吐出側軸受室に溜まる。そして、吐出側軸受室に溜まる油を回収又は排出しなければ、ロータが油に浸かるため、ロータによる油の撹拌損失が増大し、圧縮機の性能が低下する。 Although not clearly described in Patent Document 1, the oil supplied to the suction side bearing flows out to the working chamber. A part of the oil supplied to the operating chamber flows out to the discharge side bearing chamber, and the remaining oil is discharged to the discharge port together with the compressed air. Therefore, a part of the oil supplied to the suction side bearing and the working chamber finally accumulates in the discharge side bearing chamber together with the oil supplied to the discharge side bearing. If the oil accumulated in the discharge side bearing chamber is not recovered or discharged, the rotor is immersed in the oil, so that the oil stirring loss by the rotor increases and the performance of the compressor deteriorates.

そこで、例えば、吐出側軸受室から油を回収して吸入過程の作動室へ供給する油回収路を設けることが考えられる。油回収路の具体例の一つとして、ケーシングに形成された流路と、この流路に接続された外部配管とで構成することが考えられる。すなわち、吐出側軸受室と吸入過程の作動室の間の圧力差によって、吐出側軸受室から油を回収して吸入過程の作動室に供給するように構成することが考えられる。 Therefore, for example, it is conceivable to provide an oil recovery path for recovering oil from the discharge side bearing chamber and supplying it to the operating chamber in the suction process. As one of the specific examples of the oil recovery path, it is conceivable that the flow path formed in the casing and an external pipe connected to the flow path are configured. That is, it is conceivable that the oil is recovered from the discharge side bearing chamber and supplied to the operating chamber of the suction process due to the pressure difference between the discharge side bearing chamber and the operating chamber of the suction process.

しかしながら、縦型給油式スクリュー圧縮機では、吐出側軸受室から吸入過程の作動室までの高さによる負の位置ヘッドが生じることから、吐出側軸受室と吸入過程の作動室の間の圧力差(正の圧力ヘッド)だけでは、油を回収することが困難な場合がある。 However, in the vertical lubrication type screw compressor, a negative position head is generated due to the height from the discharge side bearing chamber to the suction process operating chamber, so that the pressure difference between the discharge side bearing chamber and the suction process operating chamber is generated. It may be difficult to recover the oil with (positive pressure head) alone.

本発明は、上記事柄に鑑みてなされたものであり、縦型給油式スクリュー圧縮機の吐出側軸受室に溜まる油を回収する能力を高めることを課題の一つとするものである。 The present invention has been made in view of the above matters, and one of the problems is to enhance the ability to recover the oil accumulated in the discharge side bearing chamber of the vertical lubrication type screw compressor.

上記課題を解決するために、特許請求の範囲に記載の構成を適用する。本発明は、上記課題を解決するための手段を複数含んでいるが、その一例を挙げるならば、回転軸が鉛直方向に延在するスクリューロータと、前記ロータの歯部を収納して前記ロータの歯溝に複数の作動室を形成するケーシングと、前記ケーシングに形成され、吸入ポートを介し吸入過程の作動室に対して連通する吸入口と、前記ケーシングに形成され、前記吸入ポートより下側の吐出ポートを介し吐出過程の作動室に対して連通する吐出口と、前記ロータの吸入側軸部及び吐出側軸部をそれぞれ回転可能に支持する吸入側軸受及び吐出側軸受と、前記ケーシングに形成され、前記ロータの吐出側軸部及び前記吐出側軸受を収納する吐出側軸受室とを有し、前記作動室、前記吸入側軸受、及び前記吐出側軸受に油を供給するように、且つ前記作動室及び前記吸入側軸受に供給された油の一部が前記吐出側軸受に供給された油と共に前記吐出側軸受室に溜まるように構成された縦型給油式スクリュー圧縮機において、前記ロータに形成され、前記吐出側軸受室に溜まる油を回収して前記吸入過程の作動室へ供給する油回収路を有し、前記油回収路は、前記吐出側軸受室と前記吸入過程の作動室の間の圧力差と、前記ロータの回転に伴う遠心力の作用により、前記吐出側軸受室に溜まる油を回収して前記吸入過程の作動室に供給するように構成されており、前記油回収路は、前記吐出側軸受室に連通するように前記ロータの吐出側軸部に形成された第1の開口部と、前記吸入過程の作動室に連通するように前記ロータの歯部に形成された第2の開口部と、前記ロータの内部に形成され、前記第1の開口部から軸方向に延在する縦穴と、前記ロータの内部に形成され、前記縦穴から前記第2の開口部に向かって延在する横穴とを有し、前記縦穴は、前記ロータの軸心に対し偏心する。 In order to solve the above problems, the configuration described in the claims is applied. The present invention includes a plurality of means for solving the above problems. For example, a screw rotor whose rotation axis extends in the vertical direction and a rotor that houses the bearings of the rotor. A casing forming a plurality of working chambers in the bearing groove of the bearing, a suction port formed in the casing and communicating with the working chamber in the suction process via a suction port, and a suction port formed in the casing and below the suction port. A discharge port that communicates with the operating chamber of the discharge process via the discharge port of the rotor, a suction side bearing and a discharge side bearing that rotatably support the suction side shaft portion and the discharge side shaft portion of the rotor, and the casing. It is formed and has a discharge side shaft portion of the rotor and a discharge side bearing chamber for accommodating the discharge side bearing, so as to supply oil to the operation chamber, the suction side bearing, and the discharge side bearing. In a vertical oil supply type screw compressor configured such that a part of the oil supplied to the operating chamber and the suction side bearing is accumulated in the discharge side bearing chamber together with the oil supplied to the discharge side bearing, the rotor The oil recovery path is formed in the above and collects the oil accumulated in the discharge side bearing chamber and supplies it to the operating chamber of the suction process. The oil recovery path is the discharge side bearing chamber and the operating chamber of the suction process. By the action of the pressure difference between the two and the centrifugal force accompanying the rotation of the rotor, the oil accumulated in the discharge side bearing chamber is recovered and supplied to the operating chamber of the suction process, and the oil recovery is performed. The path is formed in the first opening formed in the discharge side shaft portion of the rotor so as to communicate with the discharge side bearing chamber and in the tooth portion of the rotor so as to communicate with the operating chamber of the suction process. A second opening, a vertical hole formed inside the rotor and extending axially from the first opening, and a vertical hole formed inside the rotor and extending from the vertical hole to the second opening. It has a horizontal hole extending toward it, and the vertical hole is eccentric with respect to the axial center of the rotor.

本発明によれば、縦型給油式スクリュー圧縮機の吐出側軸受室に溜まる油を回収する能力を高めることができる。 According to the present invention, it is possible to enhance the ability to recover the oil accumulated in the discharge side bearing chamber of the vertical lubrication type screw compressor.

なお、上記以外の課題、構成及び効果は、以下の説明により明らかにされる。 Issues, configurations and effects other than the above will be clarified by the following description.

本発明の第1の実施形態における縦型給油式スクリュー圧縮機の構造を表す鉛直断面図である。It is a vertical sectional view showing the structure of the vertical lubrication type screw compressor in 1st Embodiment of this invention. 図1中断面矢視II−IIによる鉛直断面図である。FIG. 1 is a vertical cross-sectional view taken along the middle cross-sectional view II-II. 図1中断面矢視III−IIIによる水平断面図である。FIG. 1 is a horizontal cross-sectional view taken along the middle cross-sectional view III-III. 本発明の第1の変形例における雄ロータの吐出側軸部の構造を表す鉛直断面図である。It is a vertical cross-sectional view which shows the structure of the discharge side shaft part of the male rotor in the 1st modification of this invention. 本発明の第2の実施形態における縦型給油式スクリュー圧縮機の構造を表す鉛直断面図である。It is a vertical sectional view which shows the structure of the vertical type refueling type screw compressor in the 2nd Embodiment of this invention. 図5中断面矢視VI−VIによる水平断面図である。FIG. 5 is a horizontal sectional view taken along line VI-VI in the middle sectional view. 本発明の第2の変形例における雄ロータの吐出側軸部の構造を表す鉛直断面図である。It is a vertical cross-sectional view which shows the structure of the discharge side shaft part of the male rotor in the 2nd modification of this invention. 本発明の第3の変形例における雄ロータの吐出側軸部の構造を表す鉛直断面図である。It is a vertical cross-sectional view which shows the structure of the discharge side shaft part of the male rotor in the 3rd modification of this invention.

本発明の第1の実施形態を、図1〜図3を用いて説明する。図1は、本実施形態における縦型給油式スクリュー圧縮機の構造を表す鉛直断面図である。図2は、図1中断面矢視II−IIによる鉛直断面図(但し、便宜上、油回収路を図示せず)であり、図3は、図1中断面矢視III−IIIによる水平断面図(但し、便宜上、吸入口及び吸入ポートを図示せず)である。 The first embodiment of the present invention will be described with reference to FIGS. 1 to 3. FIG. 1 is a vertical sectional view showing the structure of a vertical refueling screw compressor according to the present embodiment. FIG. 2 is a vertical cross-sectional view taken along the middle cross-sectional view II-II of FIG. 1 (however, the oil recovery path is not shown for convenience), and FIG. 3 is a horizontal cross-sectional view taken along the middle cross-sectional view III-III of FIG. (However, for convenience, the suction port and the suction port are not shown).

本実施形態の縦型給油式スクリュー圧縮機は、回転軸が互いに平行で、互いに噛み合いながら回転する雄ロータ1A及び雌ロータ1Bと、雄ロータ1A及び雌ロータ1Bを収納するケーシング2とを備えている。雄ロータ1A及び雌ロータ1Bの回転軸は、鉛直方向(図1及び図2中上下方向)に延在している。 The vertical refueling screw compressor of the present embodiment includes a male rotor 1A and a female rotor 1B whose rotation axes are parallel to each other and rotate while meshing with each other, and a casing 2 for accommodating the male rotor 1A and the female rotor 1B. There is. The rotation axes of the male rotor 1A and the female rotor 1B extend in the vertical direction (vertical direction in FIGS. 1 and 2).

雄ロータ1Aは、螺旋状の歯を有する歯部3Aと、歯部3Aの吸入側(上側)に接続された吸入側軸部4Aと、歯部3Aの吐出側(下側)に接続された吐出側軸部5Aとを有している。雄ロータ1Aの吸入側軸部4Aは吸入側軸受6Aで回転可能に支持され、雄ロータ1Aの吐出側軸部5Aは吐出側軸受7Aで回転可能に支持されている。 The male rotor 1A is connected to a tooth portion 3A having spiral teeth, a suction side shaft portion 4A connected to the suction side (upper side) of the tooth portion 3A, and a discharge side (lower side) of the tooth portion 3A. It has a discharge side shaft portion 5A. The suction side shaft portion 4A of the male rotor 1A is rotatably supported by the suction side bearing 6A, and the discharge side shaft portion 5A of the male rotor 1A is rotatably supported by the discharge side bearing 7A.

同様に、雌ロータ1Bは、螺旋状の歯を有する歯部3Bと、歯部3Bの吸入側(上側)に接続された吸入側軸部4Bと、歯部3Bの吐出側(下側)に接続された吐出側軸部5Bとを有している。雌ロータ1Bの吸入側軸部4Bは吸入側軸受6Bで回転可能に支持され、雌ロータ1Bの吐出側軸部5Bは吐出側軸受7Bで回転可能に支持されている。 Similarly, the female rotor 1B has a tooth portion 3B having spiral teeth, a suction side shaft portion 4B connected to the suction side (upper side) of the tooth portion 3B, and a discharge side (lower side) of the tooth portion 3B. It has a connected discharge side shaft portion 5B. The suction side shaft portion 4B of the female rotor 1B is rotatably supported by the suction side bearing 6B, and the discharge side shaft portion 5B of the female rotor 1B is rotatably supported by the discharge side bearing 7B.

ケーシング2は、メインケーシング8と、メインケーシング8の吐出側(下側)に接続された吐出側ケーシング9と、吐出側ケーシング9の下側に取付けられた吐出側カバー10と、メインケーシング8の吸入側(上側)に取付けられた吸入側カバー11とで構成されている。メインケーシング8は、雄ロータ1Aの歯部3A及び雌ロータ1Bの歯部3Bを収納して、それらの歯溝に複数の作動室を形成するとともに、吸入口12を有している。吸入口12は、径方向の吸入ポート13を介し吸入過程の作動室に対して連通するようになっている。 The casing 2 includes a main casing 8, a discharge side casing 9 connected to the discharge side (lower side) of the main casing 8, a discharge side cover 10 attached to the lower side of the discharge side casing 9, and the main casing 8. It is composed of a suction side cover 11 attached to the suction side (upper side). The main casing 8 accommodates the tooth portions 3A of the male rotor 1A and the tooth portions 3B of the female rotor 1B, forms a plurality of working chambers in the tooth grooves thereof, and has a suction port 12. The suction port 12 communicates with the operating chamber in the suction process via the suction port 13 in the radial direction.

吐出側ケーシング9は、雄ロータ1Aの吐出側軸部5A、雌ロータ1Bの吐出側軸部5B、及び吐出側軸受7A,7Bを収納する吐出側軸受室14と、吐出口15を有している。吐出口15は、吸入ポート13より下側にある軸方向の吐出ポート16を介し吐出過程の作動室に対して連通するようになっている。 The discharge side casing 9 has a discharge side shaft portion 5A of the male rotor 1A, a discharge side shaft portion 5B of the female rotor 1B, a discharge side bearing chamber 14 for accommodating the discharge side bearings 7A and 7B, and a discharge port 15. There is. The discharge port 15 communicates with the operating chamber in the discharge process via the axial discharge port 16 below the suction port 13.

メインケーシング8は、吸入側カバー11と共に、雄ロータ1Aの吸入側軸部4A、雌ロータ1Bの吸入側軸部4B、及び吸入側軸受6A,6Bを収納するようになっている。雄ロータ1Aの吸入側軸部4Aは、吸入側カバー11を貫通して、図示しないモータの回転軸に連結されている。そして、モータの駆動によって雄ロータ1Aが回転し、雄ロータ1Aと雌ロータ1Bの噛み合いによって雌ロータ1Bも回転するようになっている。 The main casing 8 is adapted to house the suction side shaft portion 4A of the male rotor 1A, the suction side shaft portion 4B of the female rotor 1B, and the suction side bearings 6A and 6B together with the suction side cover 11. The suction side shaft portion 4A of the male rotor 1A penetrates the suction side cover 11 and is connected to a rotation shaft of a motor (not shown). Then, the male rotor 1A is rotated by driving the motor, and the female rotor 1B is also rotated by the engagement between the male rotor 1A and the female rotor 1B.

雄ロータ1A及び雌ロータ1Bの回転に伴い、作動室は、下方向に移動するとともに、その容積が変化する。これにより、作動室は、吸入ポート13を介し吸入口12から空気(気体)を吸入する吸入過程と、空気を圧縮する圧縮過程と、吐出ポート16を介し吐出口15に圧縮空気(圧縮気体)を吐出する吐出過程を行うようになっている。 As the male rotor 1A and the female rotor 1B rotate, the working chamber moves downward and its volume changes. As a result, the operating chamber has a suction process of sucking air (gas) from the suction port 12 through the suction port 13, a compression process of compressing the air, and compressed air (compressed gas) to the discharge port 15 via the discharge port 16. Is designed to perform a discharge process.

吸入側カバー11には給油孔17が形成されており、この給油孔17を介し吸入側軸受6A,6Bに油が供給される。メインケーシング8には導油孔18が形成されており、吸入側軸受6A,6Bを通過した油が導油孔18を介し吸入過程の作動室に流出する。メインケーシング8には給油孔(図示せず)が形成されており、この給油孔を介し作動室に油が供給される。作動室に供給された油の一部は吐出側軸受室14に流出し、残りは圧縮空気とともに吐出口15に吐出される。また、吐出側ケーシング9には給油孔(図示せず)が形成されており、この給油孔を介し吐出側軸受7A,7Bに油が供給される。したがって、吸入側軸受6A,6B及び作動室に供給された油の一部は、最終的に、吐出側軸受7A,7Bに供給された油と共に、吐出側軸受室14に溜まるようになっている。 An oil supply hole 17 is formed in the suction side cover 11, and oil is supplied to the suction side bearings 6A and 6B through the oil supply hole 17. An oil guide hole 18 is formed in the main casing 8, and oil that has passed through the suction side bearings 6A and 6B flows out to the operating chamber in the suction process through the oil guide hole 18. An oil supply hole (not shown) is formed in the main casing 8, and oil is supplied to the operating chamber through the oil supply hole. A part of the oil supplied to the operating chamber flows out to the discharge side bearing chamber 14, and the rest is discharged to the discharge port 15 together with the compressed air. Further, an oil supply hole (not shown) is formed in the discharge side casing 9, and oil is supplied to the discharge side bearings 7A and 7B through the oil supply hole. Therefore, a part of the oil supplied to the suction side bearings 6A and 6B and the operating chamber is finally accumulated in the discharge side bearing chamber 14 together with the oil supplied to the discharge side bearings 7A and 7B. ..

ここで、本実施形態の大きな特徴として、雄ロータ1Aには、吐出側軸受室14に溜まる油を回収して、吸入過程の作動室19(図3参照)へ供給する油回収路20が形成されている。油回収路20は、吐出側軸受室14に連通するように雄ロータ1Aの吐出側軸部5Aの端面に形成された開口部21(第1の開口部)と、吸入過程の作動室19に連通するように雄ロータ1Aの歯部3Aに形成された1つの開口部22(第2の開口部)と、雄ロータ1Aの内部に形成され、開口部21から軸方向(図1中上下方向)に延在する縦穴23と、雄ロータ1Aの内部に形成され、縦穴23から開口部22に向かって(詳細には、鉛直方向に対し斜めに)延在する1つの横穴24とを有している。図示しないものの、開口部21の径寸法は、縦穴23の径寸法より小さくなっている。このように構成された油回収路20は、吐出側軸受室14と吸入過程の作動室19の間の圧力差と、雄ロータ1Aの回転に伴う遠心力の作用(詳細には、油を汲み上げる作用)により、吐出側軸受室14に溜まる油を回収して吸入過程の作動室19へ供給するようになっている。 Here, as a major feature of the present embodiment, the male rotor 1A is formed with an oil recovery path 20 that collects the oil accumulated in the discharge side bearing chamber 14 and supplies it to the operating chamber 19 (see FIG. 3) in the suction process. Has been done. The oil recovery path 20 is provided in an opening 21 (first opening) formed on the end surface of the discharge side shaft portion 5A of the male rotor 1A so as to communicate with the discharge side bearing chamber 14 and an operating chamber 19 in the suction process. One opening 22 (second opening) formed in the tooth portion 3A of the male rotor 1A so as to communicate with each other, and an axial direction (vertical direction in FIG. 1) formed inside the male rotor 1A from the opening 21. ), And one horizontal hole 24 formed inside the male rotor 1A and extending from the vertical hole 23 toward the opening 22 (specifically, diagonally with respect to the vertical direction). ing. Although not shown, the diameter of the opening 21 is smaller than the diameter of the vertical hole 23. The oil recovery path 20 configured in this way has a pressure difference between the discharge side bearing chamber 14 and the operating chamber 19 in the suction process, and the action of centrifugal force accompanying the rotation of the male rotor 1A (specifically, pumping oil). (Action), the oil accumulated in the discharge side bearing chamber 14 is recovered and supplied to the operating chamber 19 in the suction process.

油回収路20の開口部22は、雄ロータ1Aの歯部3Aの後進面で、歯先点Aと歯底点B2の間の中間より歯先側に位置している。ここで、雄ロータ1Aの歯部3Aの前進面とは、歯部3Aの径方向断面上で歯先点Aと回転側の歯底点B1の間の輪郭であり、雄ロータ1Aの歯部3Aの後進面とは、歯部3Aの径方向断面上で歯先点Aと反対側の歯底点B2の間の輪郭である。雌ロータ1Bの歯部3Bの前進面とは、歯部3Bの径方向断面上で歯底点と回転側の歯先点の間の輪郭であり、雌ロータ1Bの歯部3Bの後進面とは、歯部3Bの径方向断面上で歯底点と反対側の歯先点の間の輪郭である。油回収路20は、雄ロータ1Aの歯部3Aの後進面に油を供給することにより、雄ロータ1Aの歯部3Aの後面側に存在する作動室の隙間をシールするようになっている。 The opening 22 of the oil recovery path 20 is the reverse surface of the tooth portion 3A of the male rotor 1A, and is located on the tooth tip side from the middle between the tooth tip point A and the tooth bottom point B2. Here, the advancing surface of the tooth portion 3A of the male rotor 1A is a contour between the tooth tip point A and the tooth bottom point B1 on the rotating side on the radial cross section of the tooth portion 3A, and the tooth portion of the male rotor 1A. The reverse surface of 3A is a contour between the tooth tip point A and the tooth bottom point B2 on the radial cross section of the tooth portion 3A. The forward surface of the tooth portion 3B of the female rotor 1B is a contour between the tooth bottom point and the tooth tip point on the rotating side on the radial cross section of the tooth portion 3B, and is the reverse surface of the tooth portion 3B of the female rotor 1B. Is the contour between the tooth bottom point and the tooth tip point on the opposite side on the radial cross section of the tooth portion 3B. The oil recovery path 20 is adapted to seal the gap of the operating chamber existing on the rear surface side of the tooth portion 3A of the male rotor 1A by supplying oil to the reverse surface of the tooth portion 3A of the male rotor 1A.

以上のように本実施形態では、油回収路20は、吐出側軸受室14と吸入過程の作動室19の間の圧力差と、雄ロータ1Aの回転に伴う遠心力の作用により、吐出側軸受室14から油を回収する。そのため、前述した圧力差だけで、吐出側軸受室14から油を回収する場合と比べ、油を回収する能力を高めることができる。したがって、雄ロータ1A及び雌ロータ1Bが油に浸かって撹拌損失が増大するのを防ぐことができ、圧縮機の性能を向上させることができる。また、圧縮機の使用油量を低減することができる。 As described above, in the present embodiment, the oil recovery path 20 has the discharge side bearing due to the pressure difference between the discharge side bearing chamber 14 and the operating chamber 19 in the suction process and the action of the centrifugal force accompanying the rotation of the male rotor 1A. Collect the oil from the chamber 14. Therefore, the ability to recover the oil can be enhanced as compared with the case where the oil is recovered from the discharge side bearing chamber 14 only by the pressure difference described above. Therefore, it is possible to prevent the male rotor 1A and the female rotor 1B from being immersed in the oil and increasing the stirring loss, and the performance of the compressor can be improved. In addition, the amount of oil used in the compressor can be reduced.

特に、図1で示すように、油回収路20の縦穴23が雄ロータ1Aの軸心(図1中一点鎖線で示す)に対し偏心することにより、同心である場合と比べ、遠心力の作用が大きくなり、油を回収する能力を高めることができる。また、油回収路20の開口部22が歯先点Aと歯底点B2の中間より歯先側に位置することにより、歯底側に位置する場合と比べ、遠心力の作用が大きくなり、油を回収する能力を高めることができる。 In particular, as shown in FIG. 1, the vertical hole 23 of the oil recovery path 20 is eccentric with respect to the axial center of the male rotor 1A (indicated by the alternate long and short dash line in FIG. 1), so that the action of centrifugal force is compared with the case where they are concentric. Can be increased and the ability to recover oil can be increased. Further, since the opening 22 of the oil recovery path 20 is located on the tooth tip side from the middle of the tooth tip point A and the tooth bottom point B2, the action of centrifugal force becomes larger than in the case where it is located on the tooth bottom side. The ability to recover oil can be enhanced.

雄ロータ1Aの回転速度が遅い運転状態では、遠心力の作用が小さくなるものの、前述した圧力差が用いられているため、油を回収する能力をある程度確保することができる。なお、吐出側軸受室14から油を回収する能力をさらに高めるため、別の油回収路(詳細には、例えば、ケーシングに形成された流路と、この流路に接続された外部配管とで構成された油回収路)を追加してもよい。 In the operating state where the rotation speed of the male rotor 1A is slow, the action of centrifugal force is small, but since the pressure difference described above is used, the ability to recover oil can be secured to some extent. In addition, in order to further enhance the ability to recover oil from the discharge side bearing chamber 14, another oil recovery path (specifically, for example, a flow path formed in the casing and an external pipe connected to this flow path) A constructed oil recovery channel) may be added.

なお、第1の実施形態において、油回収路20の縦穴23は、雄ロータ1Aの軸心に対し偏心する場合を例にとって説明したが、これに限られず、本発明の趣旨及び技術思想の範囲内で変形が可能である。すなわち、例えば図4で示す第1の変形例のように、縦穴23は、遠心力の作用が小さくなるものの、雄ロータ1Aの軸心に対し同心であってもよい。 In the first embodiment, the case where the vertical hole 23 of the oil recovery path 20 is eccentric with respect to the axial center of the male rotor 1A has been described as an example, but the present invention is not limited to this, and the scope of the gist and technical idea of the present invention. It can be transformed within. That is, for example, as in the first modification shown in FIG. 4, the vertical hole 23 may be concentric with respect to the axial center of the male rotor 1A, although the action of centrifugal force is small.

また、第1の実施形態において、油回収路20の開口部22は、雄ロータ1Aの歯部3Aの後進面で、歯先点Aと歯底点B2の間の中間より歯先側に位置する場合を例にとって説明したが、これに限られず、本発明の趣旨及び技術思想を逸脱しない範囲内で変形が可能である。すなわち、開口部22は、遠心力の作用が小さくなるものの、歯先点Aと歯底点B2の間の中間より歯底側に位置してもよい。 Further, in the first embodiment, the opening 22 of the oil recovery path 20 is located on the reverse surface of the tooth portion 3A of the male rotor 1A, and is located on the tooth tip side from the middle between the tooth tip point A and the tooth bottom point B2. However, the present invention is not limited to this, and modifications can be made without departing from the spirit and technical idea of the present invention. That is, the opening 22 may be located on the tooth bottom side from the middle between the tooth tip point A and the tooth bottom point B2, although the action of the centrifugal force is small.

また、第1の実施形態において、油回収路20は、1組の開口部22と横穴24を有する場合を例にとって説明したが、これに限られず、本発明の趣旨及び技術思想を逸脱しない範囲内で変形が可能である。すなわち、油回収路20は、2組以上の開口部22と横穴24を有してもよい。 Further, in the first embodiment, the case where the oil recovery path 20 has a set of openings 22 and a horizontal hole 24 has been described as an example, but the present invention is not limited to this, and the scope does not deviate from the gist and technical idea of the present invention. It can be transformed within. That is, the oil recovery path 20 may have two or more sets of openings 22 and side holes 24.

本発明の第2の実施形態を、図5及び図6を用いて説明する。図5は、本実施形態における縦型給油式スクリュー圧縮機の構造を表す鉛直断面図である。図6は、図5中断面矢視VI−VIによる水平断面図である。なお、本実施形態において、第1の実施形態と同等の部分は同一の符号を付し、適宜、説明を省略する。 A second embodiment of the present invention will be described with reference to FIGS. 5 and 6. FIG. 5 is a vertical cross-sectional view showing the structure of the vertical refueling screw compressor according to the present embodiment. FIG. 6 is a horizontal sectional view taken along line VI-VI in FIG. In this embodiment, the same parts as those in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted as appropriate.

本実施形態の雄ロータ1Aには、吐出側軸受室14に溜まる油を回収して、雄ロータ1Aの歯部3Aの吸入側端面とメインケーシング8の内壁の間の隙間25へ供給する油回収路20Aが形成されている。油回収路20Aは、吐出側軸受室14に連通するように雄ロータ1Aの吐出側軸部5Aの端面に形成された開口部21(第1の開口部)と、隙間25に連通するように雄ロータ1Aの歯部3Aの吸入側端面に形成された2つの開口部22A(第2の開口部)と、雄ロータ1Aの内部に形成され、開口部21から軸方向(図5中上下方向)に延在する縦穴23と、雄ロータ1Aの内部に形成され、縦穴23から2つの開口部22Aにそれぞれ向かって(詳細には、鉛直方向に対し斜めに)延在する2つの横穴24Aと有している。このように構成された油回収路20Aは、吐出側軸受室14と隙間25の間の圧力差と、雄ロータ1Aの回転に伴う遠心力の作用により、吐出側軸受室14に溜まる油を回収して隙間25へ供給するようになっている。これにより、雄ロータ1Aの歯部3Aの吸入側端面とメインケーシング8の内壁との当接を防止し、摩擦損失を低減するようになっている。 In the male rotor 1A of the present embodiment, the oil accumulated in the discharge side bearing chamber 14 is collected and supplied to the gap 25 between the suction side end surface of the tooth portion 3A of the male rotor 1A and the inner wall of the main casing 8. Road 20A is formed. The oil recovery path 20A communicates with the opening 21 (first opening) formed on the end surface of the discharge side shaft portion 5A of the male rotor 1A so as to communicate with the discharge side bearing chamber 14, and communicates with the gap 25. Two openings 22A (second opening) formed on the suction side end surface of the tooth portion 3A of the male rotor 1A, and an axial direction (vertical direction in FIG. 5) formed inside the male rotor 1A from the opening 21. ), And two horizontal holes 24A formed inside the male rotor 1A and extending from the vertical hole 23 toward the two openings 22A (specifically, diagonally with respect to the vertical direction). Have. The oil recovery path 20A configured in this way recovers the oil accumulated in the discharge side bearing chamber 14 by the action of the pressure difference between the discharge side bearing chamber 14 and the gap 25 and the centrifugal force accompanying the rotation of the male rotor 1A. Then, it is supplied to the gap 25. As a result, the contact between the suction side end surface of the tooth portion 3A of the male rotor 1A and the inner wall of the main casing 8 is prevented, and the friction loss is reduced.

以上のように本実施形態では、油回収路20Aは、吐出側軸受室14と隙間25の間の圧力差と、雄ロータ1Aの回転に伴う遠心力の作用により、吐出側軸受室14から油を回収する。そのため、前述した圧力差だけで、吐出側軸受室14から油を回収する場合と比べ、油を回収する能力を高めることができる。したがって、雄ロータ1A及び雌ロータ1Bが油に浸かって撹拌損失が増大するのを防ぐことができ、圧縮機の性能を向上させることができる。また、圧縮機の使用油量を低減することができる。 As described above, in the present embodiment, the oil recovery path 20A has oil from the discharge side bearing chamber 14 due to the pressure difference between the discharge side bearing chamber 14 and the gap 25 and the action of centrifugal force accompanying the rotation of the male rotor 1A. To collect. Therefore, the ability to recover the oil can be enhanced as compared with the case where the oil is recovered from the discharge side bearing chamber 14 only by the pressure difference described above. Therefore, it is possible to prevent the male rotor 1A and the female rotor 1B from being immersed in the oil and increasing the stirring loss, and the performance of the compressor can be improved. In addition, the amount of oil used in the compressor can be reduced.

なお、第2の実施形態において、図5で示すように、油回収路20Aの縦穴23は、雄ロータ1Aの軸心に対し同心であるが、偏心してもよい。また、第2の実施形態において、油回収路20Aは、2組の開口部22Aと横穴24Aを有する場合を例にとって説明したが、1組の開口部22Aと横穴24A、若しくは3組以上の開口部22Aと横穴24Aを有してもよい。 In the second embodiment, as shown in FIG. 5, the vertical hole 23 of the oil recovery path 20A is concentric with respect to the axial center of the male rotor 1A, but may be eccentric. Further, in the second embodiment, the case where the oil recovery path 20A has two sets of openings 22A and horizontal holes 24A has been described as an example, but one set of openings 22A and horizontal holes 24A, or three or more sets of openings. It may have a portion 22A and a side hole 24A.

また、第1及び第2の実施形態において、油回収路20又は20Aの開口部21は、雄ロータ1Aの吐出側軸部5Aの端面に直接形成された場合を例にとって説明したが、これに限られず、本発明の趣旨及び技術思想の範囲内で変形が可能である。すなわち、例えば図7で示す第2の変形例のように、ネジ26を用いて軸受おさえ部材27を吐出側軸部5Aに取付けるような構成とし、ネジ26に油回収路の開口部21を形成してもよい。また、例えば図8で示す第3の変形例のように、軸受おさえ部材27Aを圧入によって吐出側軸部5Aに取付けるような構成とし、軸受おさえ部材27Aに油回収路の開口部21を形成してもよい。 Further, in the first and second embodiments, the case where the opening 21 of the oil recovery path 20 or 20A is directly formed on the end surface of the discharge side shaft portion 5A of the male rotor 1A has been described as an example. Modifications are possible within the scope of the gist and technical idea of the present invention without limitation. That is, for example, as in the second modification shown in FIG. 7, the bearing holding member 27 is attached to the discharge side shaft portion 5A by using the screw 26, and the opening 21 of the oil recovery path is formed in the screw 26. You may. Further, for example, as in the third modification shown in FIG. 8, the bearing holding member 27A is formed to be attached to the discharge side shaft portion 5A by press fitting, and the opening 21 of the oil recovery path is formed in the bearing holding member 27A. You may.

また、第1の実施形態においては、油回収路20が吸入過程の作動室19へ油を供給するように構成された場合を説明し、第2の実施形態においては、油回収路20Aが隙間25へ油を供給するように構成された場合を説明したが、油回収路が吸入過程の作動室19及び隙間25へ油を供給するように構成されてもよい。 Further, in the first embodiment, the case where the oil recovery path 20 is configured to supply oil to the operating chamber 19 in the suction process will be described, and in the second embodiment, the oil recovery path 20A has a gap. Although the case where the oil is supplied to the 25 is described, the oil recovery path may be configured to supply the oil to the operating chamber 19 and the gap 25 in the suction process.

また、第1及び第2の実施形態においては、油回収路20又は20Aが雄ロータ1Aのみに形成された場合を例にとって説明したが、油回収路が雌ロータ1Bのみに形成されてもよいし、若しくは、雄ロータ1A及び雌ロータ1Bに形成されてもよい。 Further, in the first and second embodiments, the case where the oil recovery path 20 or 20A is formed only in the male rotor 1A has been described as an example, but the oil recovery path may be formed only in the female rotor 1B. Alternatively, it may be formed on the male rotor 1A and the female rotor 1B.

なお、以上においては、互いに噛み合いながら回転する2つのスクリューロータ1A,1Bを備えたスクリュー圧縮機に適用した場合を例にとって説明したが、これに限られず、互いに噛み合いながら回転する1つのスクリューロータ及び2つのゲートロータを備えたスクリュー圧縮機、又は、互いに噛み合いながら回転する3つのスクリューロータを備えたスクリュー圧縮機に適用してもよい。 In the above description, the case where it is applied to a screw compressor provided with two screw rotors 1A and 1B that rotate while meshing with each other has been described as an example, but the present invention is not limited to this, and one screw rotor rotating while meshing with each other and one screw rotor and It may be applied to a screw compressor equipped with two gate rotors or a screw compressor equipped with three screw rotors that rotate while meshing with each other.

1A…雄ロータ、1B…雌ロータ、2…ケーシング、3A,3B…歯部、4A,4B…吸入側軸部、5A,5B…吐出側軸部、6A,6B…吸入側軸受、7A,7B…吐出側軸受、12…吸入口、13…吸入ポート、14…吐出側軸受室、15…吐出口、16…吐出ポート、19…吸入過程の作動室、20,20A…油回収路、21…開口部、22,22A…開口部、23…縦穴、24,24A…横穴、25…隙間 1A ... male rotor, 1B ... female rotor, 2 ... casing, 3A, 3B ... teeth, 4A, 4B ... suction side shaft, 5A, 5B ... discharge side shaft, 6A, 6B ... suction side bearing, 7A, 7B ... Discharge side bearing, 12 ... Suction port, 13 ... Suction port, 14 ... Discharge side bearing chamber, 15 ... Discharge port, 16 ... Discharge port, 19 ... Suction process operating chamber, 20, 20A ... Oil recovery path, 21 ... Opening, 22, 22A ... Opening, 23 ... Vertical hole, 24, 24A ... Horizontal hole, 25 ... Gap

Claims (3)

回転軸が鉛直方向に延在するスクリューロータと、前記ロータの歯部を収納して前記ロータの歯溝に複数の作動室を形成するケーシングと、前記ケーシングに形成され、吸入ポートを介し吸入過程の作動室に対して連通する吸入口と、前記ケーシングに形成され、前記吸入ポートより下側の吐出ポートを介し吐出過程の作動室に対して連通する吐出口と、前記ロータの吸入側軸部及び吐出側軸部をそれぞれ回転可能に支持する吸入側軸受及び吐出側軸受と、前記ケーシングに形成され、前記ロータの吐出側軸部及び前記吐出側軸受を収納する吐出側軸受室とを有し、
前記作動室、前記吸入側軸受、及び前記吐出側軸受に油を供給するように、且つ前記作動室及び前記吸入側軸受に供給された油の一部が前記吐出側軸受に供給された油と共に前記吐出側軸受室に溜まるように構成された縦型給油式スクリュー圧縮機において、
前記ロータに形成され、前記吐出側軸受室に溜まる油を回収して前記吸入過程の作動室へ供給する油回収路を有し、
前記油回収路は、前記吐出側軸受室と前記吸入過程の作動室の間の圧力差と、前記ロータの回転に伴う遠心力の作用により、前記吐出側軸受室に溜まる油を回収して前記吸入過程の作動室に供給するように構成されており、
前記油回収路は、
前記吐出側軸受室に連通するように前記ロータの吐出側軸部に形成された第1の開口部と、
前記吸入過程の作動室に連通するように前記ロータの歯部に形成された第2の開口部と、
前記ロータの内部に形成され、前記第1の開口部から軸方向に延在する縦穴と、
前記ロータの内部に形成され、前記縦穴から前記第2の開口部に向かって延在する横穴とを有し、
前記縦穴は、前記ロータの軸心に対し偏心したことを特徴とする縦型給油式スクリュー圧縮機。
A screw rotor whose rotation axis extends in the vertical direction, a casing that houses the teeth of the rotor and forms a plurality of working chambers in the bearing grooves of the rotor, and a suction process formed in the casing and via a suction port. A suction port communicating with the operating chamber of the rotor, a discharge port formed in the casing and communicating with the working chamber of the discharge process via a discharge port lower than the suction port, and a suction side shaft portion of the rotor. It also has a suction side bearing and a discharge side bearing that rotatably support the discharge side shaft portion, and a discharge side bearing chamber formed in the casing and accommodating the discharge side shaft portion and the discharge side bearing of the rotor. ,
To supply oil to the working chamber, the suction side bearing, and the discharge side bearing, and a part of the oil supplied to the working chamber and the suction side bearing together with the oil supplied to the discharge side bearing. In the vertical oil supply type screw compressor configured to collect in the discharge side bearing chamber.
It has an oil recovery path formed in the rotor and collecting oil accumulated in the discharge side bearing chamber and supplying it to the operating chamber of the suction process.
The oil recovery path recovers the oil accumulated in the discharge side bearing chamber by the action of the pressure difference between the discharge side bearing chamber and the operating chamber in the suction process and the centrifugal force accompanying the rotation of the rotor. It is configured to supply to the working chamber of the inhalation process
The oil recovery path
A first opening formed in the discharge side shaft portion of the rotor so as to communicate with the discharge side bearing chamber, and
A second opening formed in the tooth portion of the rotor so as to communicate with the operating chamber of the suction process.
A vertical hole formed inside the rotor and extending axially from the first opening,
It has a horizontal hole formed inside the rotor and extending from the vertical hole toward the second opening.
The vertical hole is a vertical refueling screw compressor characterized in that it is eccentric with respect to the axial center of the rotor .
請求項に記載の縦型給油式スクリュー圧縮機において、
前記第2の開口部は、前記ロータの歯部の後進面で、歯先点と歯底点の間の中間より歯先側に位置することを特徴とする縦型給油式スクリュー圧縮機。
In the vertical refueling screw compressor according to claim 1 ,
The second opening is a reverse surface of the tooth portion of the rotor, and is a vertical refueling screw compressor characterized in that it is located on the tooth tip side from the middle between the tooth tip point and the tooth bottom point.
回転軸が鉛直方向に延在するスクリューロータと、前記ロータの歯部を収納して前記ロータの歯溝に複数の作動室を形成するケーシングと、前記ケーシングに形成され、吸入ポートを介し吸入過程の作動室に対して連通する吸入口と、前記ケーシングに形成され、前記吸入ポートより下側の吐出ポートを介し吐出過程の作動室に対して連通する吐出口と、前記ロータの吸入側軸部及び吐出側軸部をそれぞれ回転可能に支持する吸入側軸受及び吐出側軸受と、前記ケーシングに形成され、前記ロータの吐出側軸部及び前記吐出側軸受を収納する吐出側軸受室とを有し、
前記作動室、前記吸入側軸受、及び前記吐出側軸受に油を供給するように、且つ前記作動室及び前記吸入側軸受に供給された油の一部が前記吐出側軸受に供給された油と共に前記吐出側軸受室に溜まるように構成された縦型給油式スクリュー圧縮機において、
前記ロータに形成され、前記吐出側軸受室に溜まる油を回収して前記ロータの歯部の吸入側端面と前記ケーシングの壁面の間の隙間へ供給する油回収路を有し、
前記油回収路は、前記吐出側軸受室と前記隙間の間の圧力差と、前記ロータの回転に伴う遠心力の作用により、前記吐出側軸受室に溜まる油を回収して前記隙間に供給するように構成されており、
前記油回収路は、
前記吐出側軸受室に連通するように前記ロータの吐出側軸部に形成された第1の開口部と、
前記隙間に連通するように前記ロータの歯部の吸入側端面に形成された第2の開口部と、
前記ロータの内部に形成され、前記第1の開口部から軸方向に延在する縦穴と、
前記ロータの内部に形成され、前記縦穴から前記第2の開口部に向かって延在する横穴とを有し、
前記縦穴は、前記ロータの軸心に対し偏心したことを特徴とする縦型給油式スクリュー圧縮機。
A screw rotor whose rotation axis extends in the vertical direction, a casing that houses the teeth of the rotor and forms a plurality of working chambers in the bearing grooves of the rotor, and a suction process formed in the casing and via a suction port. A suction port communicating with the operating chamber of the rotor, a discharge port formed in the casing and communicating with the working chamber of the discharge process via a discharge port lower than the suction port, and a suction side shaft portion of the rotor. It also has a suction side bearing and a discharge side bearing that rotatably support the discharge side shaft portion, and a discharge side bearing chamber formed in the casing and accommodating the discharge side shaft portion and the discharge side bearing of the rotor. ,
To supply oil to the working chamber, the suction side bearing, and the discharge side bearing, and a part of the oil supplied to the working chamber and the suction side bearing together with the oil supplied to the discharge side bearing. In the vertical oil supply type screw compressor configured to collect in the discharge side bearing chamber.
It has an oil recovery path formed in the rotor and collecting oil accumulated in the discharge side bearing chamber and supplying it to a gap between the suction side end surface of the tooth portion of the rotor and the wall surface of the casing.
The oil recovery path recovers the oil accumulated in the discharge side bearing chamber by the action of the pressure difference between the discharge side bearing chamber and the gap and the centrifugal force accompanying the rotation of the rotor and supplies the oil to the gap. It is configured to,
The oil recovery path
A first opening formed in the discharge side shaft portion of the rotor so as to communicate with the discharge side bearing chamber, and
A second opening formed on the suction side end face of the rotor tooth portion so as to communicate with the gap,
A vertical hole formed inside the rotor and extending axially from the first opening,
It has a horizontal hole formed inside the rotor and extending from the vertical hole toward the second opening.
The vertical hole is a vertical refueling screw compressor characterized in that it is eccentric with respect to the axial center of the rotor .
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