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1. 发明授权

US11603839B2 Scroll compressor with two step inverter control 有权
公开(公告)号：US11603839B2
公开(公告)日：2023-03-14
申请号：US16475414
申请日：2017-01-27
申请人： Hitachi Industrial Equipment Systems Co., Ltd.
发明人： Zhijia Ren , Yoshiyuki Kanemoto
IPC分类号： F04C28/06 , F04C28/28 , F04C14/06 , F04C18/02
摘要： An object of the present invention is to provide a scroll compressor with a simple configuration which is capable of preventing the occurrence of noise induced due to compressed air remaining in a discharge pipe flow backward and an orbiting scroll rotating reversely when stopping the compressor. To this end, there is provided a scroll compressor including a scroll type compressor body provided with an orbiting scroll and a fixed scroll; a motor that drives the compressor body; an inverter that drives the motor; a discharge pipe that connects a discharge port of the compressor body to an air tank storing air compressed by the compressor body; and a check valve that shuts off the compressed air flowing backward from the air tank in the discharge pipe, in which, when stopping the compressor body, the inverter controls a rotational speed of the motor driving the compressor body, in two steps at a first deceleration and a second deceleration lower than the first deceleration, from when a stop command is output until the compressor body stops.

2. 发明授权

US11519811B2 Leak detector and leak detection method for leak-testing objects 有权
公开(公告)号：US11519811B2
公开(公告)日：2022-12-06
申请号：US16642295
申请日：2018-08-23
申请人： PFEIFFER VACUUM
发明人： Julien Coulomb
IPC分类号： G01M3/20 , F04C25/02 , F04C28/28 , F04D19/04 , F04C23/00
摘要： A leak detector is provided for leak-testing objects that are to be tested by spraying tracer gas, the leak detector including: a detection inlet configured to be connected to an object that is to be tested; a pumping device including a vacuum line connected to the detection inlet, a rough-vacuum pump connected to the vacuum line, and a turbomolecular vacuum pump connected to the vacuum line, a delivery of which is connected to the rough-vacuum pump; and a gas detector connected to the turbomolecular vacuum pump, the pumping device further including an ancillary pump connected to the rough-vacuum pump and being configured to lower an ultimate-vacuum pressure of tracer gas in the rough-vacuum pump. A leak detection method for leak-testing objects that are to be tested by spraying tracer gas is also provided.

3. 发明申请

US20220372981A1 SENSOR ASSEMBLY 有权
公开(公告)号：US20220372981A1
公开(公告)日：2022-11-24
申请号：US17770489
申请日：2020-10-09
申请人： Edwards Limited
发明人： Peter Anthony McBrien , Geoffrey Peter Fisher
IPC分类号： F04C28/28 , F04C25/02 , F04C18/12
摘要： A sensor assembly for use in an apparatus comprising at least one moving part and at least one stationary part is provided. The assembly comprises a probe and means for mounting the sensor to a stationary part of the apparatus. The probe comprises a portion of an incomplete circuit which, when completed, produces a signal. In use, when the probe is engaged by a moving part of the apparatus, a signal is produced. A vacuum pump or a compressor pump comprising the sensor and a method for preventing failure of an apparatus are also provided.

4. 发明申请

US20220364560A1 SCROLL COMPRESSOR 有权
公开(公告)号：US20220364560A1
公开(公告)日：2022-11-17
申请号：US17874485
申请日：2022-07-27
申请人： LG Electronics Inc.
发明人： Yongkyu Choi , Kangwook Lee , Cheolhwan Kim , Byeongchul Lee
IPC分类号： F04C18/02 , F04C28/28
摘要： A scroll compressor is provided that may include an orbiting scroll having an orbiting wrap, and which performs an orbiting motion; and a fixed scroll having a fixed wrap to form a compression chamber including a suction chamber, an intermediate pressure chamber, and a discharge chamber, by being engaged with the orbiting wrap. In a state in which the orbiting scroll and the fixed scroll are concentric with each other, when a distance between the orbiting wrap and the fixed wrap is defined as an orbiting radius, there exists an offset section having an interval larger than the orbiting radius, between a side surface of the orbiting wrap and a side surface of the fixed wrap which faces the orbiting wrap. With such a configuration, even if the fixed scroll or the orbiting scroll is transformed due to thermal expansion, interference between the fixed wrap and the orbiting wrap at a portion having a large transformation amount may be prevented. This may prevent a frictional loss or abrasion between the fixed wrap and the orbiting wrap. Further, this may restrict or minimize a gap between the fixed wrap and the orbiting wrap at an opposite side to the suction chamber, resulting in enhanced compression efficiency.

5. 发明授权

US11460026B2 Compressor unit and method for operating a compressor unit 有权
公开(公告)号：US11460026B2
公开(公告)日：2022-10-04
申请号：US16152079
申请日：2018-10-04
申请人： BITZER Kuehlmaschinenbau GmbH
发明人： Tihomir Mikulic , Roni Loerch , Klaus Feller
IPC分类号： F04C18/16 , F04C28/28 , F04C28/12 , F04C29/02 , F04C28/06
摘要： A compressor unit including a screw compressor having a compressor housing that has a screw rotor chamber arranged in the compressor housing, two screw rotors that are arranged in the screw rotor chamber and are mounted on the compressor housing to be rotatable about a respective screw rotor axis, and at least one control slider, which is arranged in a slider channel of the compressor housing, is adjacent to both screw rotors and is movable in a direction of displacement parallel to the screw rotor axes and takes a form such that it affects the final volume and/or the initial volume, wherein there is provided on the screw compressor a compressor operational control unit that takes a form such that it performs a compressor operating function that assists at least one operation of the compressor unit.

6. 发明申请

US20220120274A1 ORBITAL PUMP 有权
公开(公告)号：US20220120274A1
公开(公告)日：2022-04-21
申请号：US17428195
申请日：2020-02-18
申请人： Edwards Limited
发明人： Peter Anthony McBrien
IPC分类号： F04C18/02 , F04C28/28
摘要： A safety device for an orbital pump has first and second interleaved parts which are operable to follow an orbital path with respect to each other, the safety device comprising: a first member fixable with respect to the first interleaved part; and a second member fixable with respect to the second interleaved part, the second member defining an aperture into which the first member is receivable, the aperture being dimensioned to prevent movement of the first interleaved part with respect to the second interleaved part beyond the orbital path. In this way, the members of the safety device help to prevent the moving components of the pump contacting, thereby preventing damage.

7. 发明申请

US20220018348A1 SCROLL COMPRESSOR 有权
公开(公告)号：US20220018348A1
公开(公告)日：2022-01-20
申请号：US17299589
申请日：2019-02-14
申请人： Mitsubishi Electric Corporation
发明人： Tomokazu MATSUI , Yuji TAKAMURA , Yutaro IWAMOTO
IPC分类号： F04C29/04 , F04C18/02 , F04C28/28
摘要： A scroll compressor includes a shell that is cylindrical, a fixed scroll fixed to an inner wall of the shell, an orbiting scroll that faces the fixed scroll, a frame fixed to the inner wall of the shell and that supports the orbiting scroll, and a heat source device provided on an outside of the shell and between the fixed scroll and the frame and configured to heat or cool the shell from the outside.

8. 发明授权

US11053940B2 Vacuum pump with separate oil outlet with relief valve 有权
公开(公告)号：US11053940B2
公开(公告)日：2021-07-06
申请号：US16197756
申请日：2018-11-21
申请人： Joma-Polytec GmbH
发明人： Hans-Peter Ott , Mathias Schlotterer , Torsten Helle
IPC分类号： F04C18/344 , F04C28/28 , F04C15/06
摘要： A vacuum pump having a housing which limits a working space and having a rotor, rotatably mounted in the housing about a rotor axis, the rotor guides a vane being movably mounted in the radial direction, the vane has a transverse extent, and the vane divides the working space into a suction side having a suction inlet and a pressure side having a pressure outlet, the housing has at least one oil outlet, the oil outlet is closed by a relief valve, the relief valve assumes an open position, when a limit pressure lying above a nominal pressure is exceeded in the working space, and the transverse extent of the vane is large enough that when the vane passes the oil outlet, the oil outlet is closed by the vane, so that there is no fluid connection between the suction side and the pressure side over the oil outlet.

9. 发明授权

US10794382B2 Screw compressor with control slider and detector 有权
公开(公告)号：US10794382B2
公开(公告)日：2020-10-06
申请号：US15482021
申请日：2017-04-07
申请人： BITZER Kuehlmaschinenbau GmbH
发明人： Roni Loerch , Klaus Feller , Tihomir Mikulic
IPC分类号： F03C2/00 , F03C4/00 , F04C18/00 , F04C28/20 , F04C18/16 , F04C28/12 , F04C28/28
摘要： A screw compressor includes a compressor housing which has a screw rotor chamber arranged therein. Two screw rotors are arranged in the screw rotor chamber. At least one control slider is arranged in a slider channel of the compressor housing and is adjacent to both screw rotors by means of slider compression wall surfaces. The control slider is moveable in a direction of displacement parallel to the screw rotor axes. There is a position determining device for the at least one control slider. The position determining device has a position indicator that is coupled to the at least one control slider. The position indicator cooperates with a detector that extends parallel to the direction of displacement of the at least one control slider and along which the position indicator is moveable. The detector element is coupled to an evaluation device that determines the positions of the position indicator along the detector.

10. 发明授权

US10746176B2 Compressor control for increased efficiency 有权
公开(公告)号：US10746176B2
公开(公告)日：2020-08-18
申请号：US15620516
申请日：2017-06-12
申请人： TRANE INTERNATIONAL INC.
发明人： Jay H. Johnson , Alberto Scala
IPC分类号： F04C28/08 , F04C28/12 , F04B49/20 , F04B49/03 , F04B49/06 , F25B49/02 , F04C18/16 , F04C28/24 , F04C28/28
摘要： Control systems and methods for increasing efficiency of a compressor while the compressor capacity exceeds compressor load, by using a mechanical unloader such as a slide valve to reduce the internal volume ratio of the compressor and allow a more efficient speed to be maintained by a variable frequency drive (VFD) while reducing the compressor capacity based on the load. Control systems include the VFD, a controller for the VFD and the mechanical unloader, and temperature sensors. Compressor embodiments further include one or more compressors and mechanical unloaders operated by the control systems.

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