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1. 发明申请

US20190107109A1 OIL-FREE SCREW COMPRESSOR 审中-公开
公开(公告)号：US20190107109A1
公开(公告)日：2019-04-11
申请号：US16087510
申请日：2017-03-21
申请人： Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)
发明人： Toshiyuki MIYATAKE
IPC分类号： F04C27/00 , F04C18/16
摘要： The oil-free screw compressor includes: a screw rotor including a screw and a shaft; a bearing; a first shaft seal device disposed between the screw and the bearing, the first shaft seal device including: a first seal and a first communication section configured to communicate the bearing side with respect to between the shaft and the first seal, and an outer peripheral face of the first shaft seal device; a second shaft seal device disposed between the first shaft seal device and the bearing, the second shaft seal device including: a second seal and a second communication section configured to communicate the screw side with respect to between the shaft and the second seal, and an outer peripheral face of the second shaft seal device; and a first seal member including a seal between the first communication section and the second communication section. The casing includes an atmosphere communication section configured to communicate the first communication section and the second communication section with an atmosphere. A sectional area in the first communication section is larger than a sectional area between the seal of the first seal member and the shaft.

2. 发明申请

US20170002813A1 METHOD FOR FORMING HOLE-PROCESSED CAST, CAST CASING, AND SCREW COMPRESSOR CASING 审中-公开
标题翻译：用于成型加工铸件，铸件和螺杆压缩机壳体的方法
公开(公告)号：US20170002813A1
公开(公告)日：2017-01-05
申请号：US15114146
申请日：2014-11-27
申请人： KABUSHIKI KAISHA KOBE SEIKO SHO (KOBE STEEL, LTD.)
发明人： Toshiyuki MIYATAKE , Tomoya YONETSU
IPC分类号： F04C18/16 , B22C9/24 , B23B41/00 , B22C9/02
CPC分类号： F04C18/16 , B22C9/02 , B22C9/24 , B23B35/00 , B23B41/00 , B23B2228/21 , F01C21/10 , F04C2230/10 , F04C2230/21 , F04C2240/30
摘要： A method for forming drilled cast which includes drilling with a drill so as to provide communication with a cast hole includes a casting step and a drilling step. The casting step is to cast a cast having a cast hole which includes a flat inner wall surface in which width of a position to be drilled with the drill is obtained by adding first length H1 serving as a manufacturing error range of the cast to a diameter D of the drill, which is a second length H2. The drilling step is to form a through hole providing communication between an interior of the cast hole and an exterior of the cast through the flat inner wall surface with the drill.
摘要翻译：一种用于形成钻孔铸件的方法，其包括用钻头钻孔以提供与铸造孔相连通的方法包括铸造步骤和钻削步骤。铸造步骤是铸造具有铸造孔的铸件，该铸件包括平坦的内壁表面，在该内壁表面中，通过将作为铸件的制造误差范围的第一长度H1添加到直径 D，其是第二长度H2。钻孔步骤是形成一个通孔，该通孔通过钻头通过平坦的内壁表面提供铸造孔的内部和铸件的外部之间的连通。

3. 发明申请

US20170284392A1 OIL-FREE SCREW COMPRESSOR AND DESIGN METHOD THEREFOR 审中-公开
公开(公告)号：US20170284392A1
公开(公告)日：2017-10-05
申请号：US15513841
申请日：2015-09-24
申请人： Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)
发明人： Yoshio YANO , Toshiyuki MIYATAKE
IPC分类号： F04C18/16 , F04C29/00 , F04C27/00
CPC分类号： F04C18/16 , F04C27/005 , F04C27/009 , F04C29/00
摘要： The oil-free screw compressor includes: a casing having a rotor chamber; a bearing supporting rotary shafts of screw rotors; a shaft seal device with an oil seal portion and an air seal portion; a ventilation gap positioned between the oil seal portion and the air seal portion; and an atmosphere open passage communicating an atmosphere side of the casing with the ventilation gap communicate. A most narrowed portion, an air seal portion, and oil seal portions are set such that the followings is established: (La/Sa2.5)/(Lh/Sh2.5)>|P2|/ΔPb La: effective shaft seal length Sh: effective open cross-sectional area (most narrowed portion of atmosphere open passage) Lh: effective narrowed length (most narrowed portion of atmosphere open passage) Sa: shaft seal cross-sectional area |P2|: negative pressure in rotor chamber during unloading operation ΔPb: minimum differential pressure in the oil seal portion during the unloading operation

4. 发明申请

US20170016446A1 OIL-FREE SCREW COMPRESSOR 审中-公开
标题翻译：无油螺杆压缩机
公开(公告)号：US20170016446A1
公开(公告)日：2017-01-19
申请号：US15124596
申请日：2014-12-11
申请人： KABUSHIKI KAISHA KOBE SEIKO SHO (KOBE STEEL, LTD.)
发明人： Yoshio YANO , Toshiyuki MIYATAKE
IPC分类号： F04C27/00 , F04C27/02 , F04C29/12 , F04C18/16
CPC分类号： F04C27/009 , F01C21/02 , F04C18/16 , F04C27/02 , F04C29/12 , F04C2240/20 , F04C2240/30 , F04C2240/50 , F16J15/3484
摘要： An oil-free screw compressor with good assemblability of a shaft seal device that reduces leakage of a compressed gas, where the oil-free screw compressor accommodates male and female screw rotors in a rotor chamber of a casing, supports each screw rotor by a bearing through a rotor shaft, and has shaft seal devices in a shaft seal space. The shaft seal devices include an oil seal on the side of the bearing, a packing case on the side of the rotor chamber, and a gas seal. An end of the packing case on the side of the bearing and an end of the oil seal on the side of the rotor chamber are fitted and fixed by interference fit to form a gas seal accommodation space, the gas seal accommodation space accommodating the seal ring.
摘要翻译：一种无油螺杆式压缩机，其具有良好的轴封装置组装性，可减少压缩气体的泄漏，其中无油螺杆压缩机容纳阳壳和阴螺纹转子在壳体的转子室中，由轴承支承每个螺杆转子通过转子轴，并在轴封空间中具有轴封装置。轴封装置包括轴承侧面的油封，转子室一侧的包装箱和气密封。轴承一侧的包装箱端部和转子室一侧的油封端部通过过盈配合装配固定，形成气体密封容纳空间，容纳密封环的气体密封容纳空间。

5. 发明申请

US20190024663A1 OIL-FREE SCREW COMPRESSOR 审中-公开
公开(公告)号：US20190024663A1
公开(公告)日：2019-01-24
申请号：US16068138
申请日：2016-12-05
申请人： Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)
发明人： Mio INAZAKI , Toshiyuki MIYATAKE , Yoshio YANO , Shoji YOSHIMURA
IPC分类号： F04C27/00 , F04C18/16 , F04C29/02
摘要： The oil-free screw compressor includes: a screw rotor, a bearing configured to support a rotor shaft, a shaft seal device including an oil seal arranged at a position closer to the bearing and a gas seal arranged on at a position closer to the rotor chamber, an atmosphere communication space communicating with an atmosphere communication hole, and an oil return groove including a return inclined surface inclined so as to expand in diameter radially outward from a gas seal-side end to an oil seal-side end. The oil seal portion is a viscoseal including a spiral groove portion. An inner peripheral surface of the oil seal includes an inner peripheral boundary portion that defines a part of the atmosphere communication space, on a side closer to the bearing in the atmosphere communication hole. The oil seal-side end is arranged in a vicinity of the inner peripheral boundary portion and at a position closer to the bearing.

6. 发明申请

US20180363650A1 SCREW COMPRESSOR 审中-公开
公开(公告)号：US20180363650A1
公开(公告)日：2018-12-20
申请号：US16060964
申请日：2016-11-15
申请人： Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)
发明人： Masahiro KIKUCHI , Kazuki TSUGIHASHI , Yoshio YANO , Toshiyuki MIYATAKE
IPC分类号： F04C18/16 , F04C29/00
摘要： A screw compressor 2 includes a compressor main body 4, a motor 8, and a gearbox 10. The compressor main body 4 includes screw rotors 5c, 5d, 6c, and 6d, rotor casings 5e and 6e accommodating therein the screw rotors 5c, 5d, 6c, and 6d, and main body casings 5a and 6a accommodating therein the rotor casings 5e and 6e, the main body casings being provided with first flanges 5b and 6b on respective ends thereof. The motor 8 drives the screw rotors 5c, 5d, 6c, and 6d via gears 10f and 10g. The gearbox 10 has an attachment surface Son which the first flange 6b to the main body casings 5a and 6a is attached, accommodates therein the gears 10f and 10g, and has a substantially rectangular shape. In a state where the compressor main body 4 is attached to the gearbox 10, a part of the first flange 6b extends to an outside of the attachment surface S, and projection regions of the rotor casings 5e and 6e onto the attachment surface S exist within the attachment surface S. In this way, vibrations of the screw compressor 2 can be reduced.

7. 发明申请

US20170306959A1 OIL-FREE SCREW COMPRESSOR 审中-公开
公开(公告)号：US20170306959A1
公开(公告)日：2017-10-26
申请号：US15513830
申请日：2015-09-24
申请人： Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)
发明人： Yoshio YANO , Toshiyuki MIYATAKE
IPC分类号： F04C27/00 , F04C18/16 , F04C27/02
CPC分类号： F04C27/009 , F04B39/00 , F04C18/16 , F04C27/00 , F04C27/02 , F04C2220/12 , F04C2230/21 , F04C2240/30 , F04C2240/50 , F04C2240/60 , F16J15/40 , F16J15/441
摘要： An oil-free screw compressor includes: a casing having a rotor chamber; a bearing supporting rotary shafts of the screw rotors; a shaft seal device including an oil seal portion and an air seal portion; an atmosphere open hole formed in the shaft seal device; at least one communication hole formed in the rotary shaft; and an annular space communicating the atmosphere open hole with the at least one communication hole communicate with each other. The annular space includes an inner peripheral annular space formed on an inner peripheral side of the casing. Assuming an open cross-sectional area of the inner peripheral annular space as S1, a total open cross-sectional area of the communication holes as S2, an open cross-sectional area of the i-th communication hole out of the communication holes as S2i, and the number of communication holes as n (n being a natural number of 1 or more), a following relationship is satisfied. S   1 ≧ S   2 = ∑ i = 1 n   S   2  i

8. 发明申请

US20180355867A1 SCREW COMPRESSOR 审中-公开
公开(公告)号：US20180355867A1
公开(公告)日：2018-12-13
申请号：US16060065
申请日：2016-11-15
申请人： Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)
发明人： Yoshio YANO , Toshiyuki MIYATAKE , Masahiro KIKUCHI
IPC分类号： F04C29/00 , F04C18/16
CPC分类号： F04C29/005 , F04C18/16 , F04C23/00 , F04C29/00 , F04C29/0085
摘要： The screw compressor includes a first-stage compressor main body and a second-stage compressor main body for compressing fluid with screw rotors, a motor for driving the first-stage compressor main body and the second-stage compressor main body, and a gear box. The gear box is connected to the first-stage compressor main body, the second-stage compressor main body, and the motor; transmits a driving force of the motor to the screw rotors, and includes a first attachment hole for attaching the first-stage compressor main body and a second attachment hole for attaching the second-stage compressor main body; and is provided with an annular rib surrounding both of the first attachment hole and the second attachment hole. In the screw compressor, the vibration of the natural vibration mode which is most burdensome and should be reduced can be efficiently reduced.

9. 发明申请

US20170306958A1 OIL-FREE SCREW COMPRESSOR 审中-公开
公开(公告)号：US20170306958A1
公开(公告)日：2017-10-26
申请号：US15513144
申请日：2015-09-24
申请人： Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)
发明人： Toshiyuki MIYATAKE
IPC分类号： F04C27/00 , F04C18/16 , F04C29/02
CPC分类号： F04C27/009 , F01C21/02 , F04C18/16 , F04C29/02 , F04C2240/30 , F04C2240/50 , F04C2240/60 , F04C2240/605
摘要： An oil-free screw compressor has a screw rotor including a screw and a shaft, a bearing supporting the shaft, a first shaft seal device disposed between the screw and the bearing and including a first seal opposite to the shaft, and a first communication portion communicating the bearing side with respect to between the shaft and the first seal and the outer peripheral face of the first shaft seal device, and a second shaft seal device disposed between the first shaft seal device and the bearing and including a second seal opposite to the shaft, and a second communication portion communicating the screw side with respect to between the shaft and the second seal and the outer peripheral face of the second shaft seal device. A casing includes an atmosphere communication portion connected to both of the first communication portion and the second communication portion on the inner peripheral face of a shaft accommodation space, and communicating the first communication portion and the second communication portion with the atmosphere.

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