A rotor polishing device, including a housing with a space therein for holding rotors in need of polishing, an inlet for pumping a polishing lapper into the housing, and a rotational assembly for rotating the rotors during the polishing process. The rotor polishing device is useful for polishing rotors commonly used by rotary screw compression systems.

Provided are a compressor and a monitoring system that can specify a cause of an anomaly of a sensed value of a sensor. A compressor (1) includes: a temperature sensor (11A) that senses a temperature of a compressed air on a discharge side of a low-pressure-stage compressor body (3) and on an upstream side of an intercooler (5); a pressure sensor (12A) that senses a pressure of the compressed air on the discharge side of the low-pressure-stage compressor body (3); a temperature sensor (11B) that senses a temperature of the compressed air on an intake side of a high-pressure-stage compressor body (6) and on a downstream side of the intercooler (5); a temperature sensor (11C) that senses a temperature of the compressed air on a discharge side of the high-pressure-stage compressor body (6); a controller (8) that decides whether or not an anomaly has occurred in sensed values of the sensors (11A), (11B), (11C), and (12A), and estimates a cause of the anomaly; and a display device (9) that displays the cause of the anomaly estimated by the controller (8).

A pump and method for pumping a gas are disclosed. The pump comprises a rotor and a stator. At least one of the rotor or stator comprises at least one liquid opening configured for fluid communication with a liquid source. The liquid opening is configured such that in response to a driving force exerted on liquid from the liquid source a stream of liquid is output from the opening, the stream of liquid forming a liquid blade between the rotor and the stator, gas confined by said stator, said rotor and said liquid blade being driven through said pump from a gas inlet towards a gas outlet.

A surgical evacuation system having dual in-series large and small droplet filters is provided. The surgical evacuation system comprises a pump, a motor operably coupled to the pump, and a flow path fluidically coupled to the pump. the flow path comprises a first fluid filter configured to extract a large droplet in a fluid moving through the flow path and a second fluid filter configured to extract a small droplet in the fluid moving through the flow path. the first fluid filter is coupled in series with the second fluid filter. The first fluid filter is positioned upstream of the second fluid filter. An outlet port of the second fluid filter is coupled to an inlet port of a non-fluid filter.

A roots rotor for removing dust coagulum and droplets comprises a rotor body, which rotates inside the roots pump case. Both ends of the rotor body are sealing surfaces, which are meshed with the inner wall of the roots pump case. The rotor slot scraping cavities are arranged on both sides of the sealing surface. The side of the rotor slot scraping cavity close to the sealing surface is set as the scraper surface, which forms a sharp edge with the sealing surface. A guide surface is arranged on the surface of the rotor body, and the guide surface is located on the side of the rotor slot scraping cavity away from the sealing surface. The utility model overcomes the disadvantages of the prior art, and the attachment can be scraped off and gathered into the rotor slot scraping groove through the action of the scraper surface; and with the rotation of the rotor body, the particles and dust can be easily dropped outside the exhaust port of the pump; thus to achieve to avoid the accumulation of dust, coagulum and other incompressible medium in the process gas on the wall of the pump case.

A surgical evacuation system for communication between a smoke evacuation device and a filter device through a communication circuit is provided. The surgical evacuation system can include a smoke evacuation device, which can include a pump and a motor operably coupled to the pump. The surgical evacuation system also can include a communication circuit and a filter device in communication with the smoke evacuation device through the communication circuit. The filter device can include a plurality of filter components including filter elements and filter sensors. The filter elements can include a fluid filter, particulate filter, and/or a charcoal filter. The communication circuit is configured to authenticate the filter components, verify a remaining life of at least one of the filter components, update parameters output from the filter components, and record errors output from the filter components.

Disclosed is a liquid-ring vacuum pump that enables a worker to inspect components provided in a main body from the outside using a see-through device without disassembling the main body and to easily remove foreign matter from the main body merely by demounting the see-through device from the main body. The liquid-ring vacuum pump includes a main body, which accommodates a shaft centrally mounted therein to receive rotational force from a driving motor and has a mounting hole formed therein so as to communicate with the interior of the main body, a rotor rotating together with the shaft inside the main body, a head unit coupled to at least one side of the main body, and a see-through device, which is detachably mounted in the mounting hole and includes a see-through window member to allow the interior of the main body to be inspected with the naked eye.

A compressor system includes a compressor having a rotor; a bearing supporting the rotor, wherein the bearing is disposed in a bearing cavity; and wherein the bearing has a near frictionless coating; and a purge gas system in fluid communication with the bearing cavity and constructed to purge air from the bearing cavity and supply the bearing cavity with the purge gas during operation of the compressor. The purge gas can be nitrogen and the near frictionless coating can be a near-frictionless diamond-like carbon coating.

An apparatus and method prevent entrained solids from entering a pump by directing a process stream through an active upstream filter that removes the solids, and then through a downstream idle filter where the process stream purges the filter of previously retained solids. The flow path is periodically switched to exchange the roles of the filters, so that none of the filters is saturated, and the solids remain in the process flow but bypass the pump. Any need for a low pressure destination for purged solids and purging fluid and/or any environmental impact of dumping process fluid and solids into the environment is thereby avoided. Partially opened valves can be used to divert only part of the downstream flow for filter purging. Selectable paths can be included for which no filters are purged. The downstream flow can be divided and used to simultaneously purge a plurality of idle filters.

In embodiments, a compressor includes three suction pipes. A first center of a first suction pipe, a second center of a second suction pipe, and a third center of a third suction pipe are positioned at vertices of a triangle. A first distance between the first center and a center of a compressor main body is smaller than a second distance between the second center and the center of the compressor main body and a third distance between the third center and the center of the compressor main body. A first flow path cross section of the first suction pipe overlaps a center connection line passing through the center of the compressor main body and a center of an accumulator. A second flow path cross section and a third flow path cross section are positioned on opposite sides of the center connection line sandwiched therebetween. The first suction pipe is connected to a suction port which is at an uppermost position among three suction ports provided in a case.