摘要:
A centrifugal blower includes a motor including a stator and a motor cover, a centrifugal impeller rotating together with a rotating portion of the motor, and a blower casing. The stator includes a stator core including a toric core back. The motor cover includes an upper surface, and a cylindrical outer peripheral surface extending downwards. The blower casing disposed above the impeller includes an upper side casing top plate portion in which an intake port is disposed at the middle, and a cylindrical wall portion extending downwards from the upper side casing top plate portion. An inner peripheral surface of the wall portion and the outer peripheral surface of the motor cover forms a flow path continuous in the axial direction. A discharge port is formed in a lower end portion of the flow path. The core back includes an exposed portion exposed to the flow path.
摘要:
A ventilation fan (10, 200) includes a shaft assembly (22, 212), a rotor (24, 214), a motor housing (26, 216), and a bearing housing (28, 218). The shaft assembly (22, 212) defines a first port (90, 290) and a second port (92, 300). The rotor (24, 214) has a rotor first portion disposed about a first portion of the shaft assembly (22, 212) and a rotor second portion (122, 312) that extends from the rotor first portion (120, 310). The rotor first portion (120, 310) defines a rotor port (124, 314). The motor housing (26, 216) is disposed about a second portion of the shaft assembly. The motor housing (26, 216) defines a housing port. The bearing housing (28, 218) is operatively connected to the motor housing (26, 216). The bearing housing (28, 218) is disposed about a third portion of the shaft assembly.
摘要:
A molecular pump (1A) includes a pump body (2) provided with a turbo molecular pump portion (2a), a control unit (4) provided with a control portion and a power supply portion, and a cooling unit (3) for cooling the pump body (2) and the control unit (4). A first temperature detecting portion (90) is provided in a first position, which is a position inside the control unit (4) and has a low temperature. A second temperature detecting portion (80) also serving as a humidity detecting portion is provided in a second position, which is a position inside the control unit (4) and has a high temperature. The control portion controls the operation of the cooling unit (3) in accordance with a relative humidity in the first position, calculated based on temperature information detected by the first temperature detecting portion (90) and based on temperature information and humidity information detected by the second temperature detecting portion (80) also serving as a humidity detecting portion.
摘要:
A system and method for rapid pressurization of a motor compartment and cooling system during a shutdown, a surge, and/or other situations in which the suction pressure significantly varies. A motor/compressor arrangement includes a seal gas system fluidly communicating with the motor compartment via a motor pressurization line, with the outlet of the compressor, and with a shaft seal. A motor pressurization valve is coupled to the motor pressurization line and a controller is configured to open the motor pressurization valve at start-up of the motor-compressor to supply seal gas to the motor compartment and to pressurize the motor compartment when a difference between the seal gas supply pressure and the suction pressure is indicative of the seal gas supply pressure being insufficient.
摘要:
A multistage turbomachine is disclosed, comprising a casing with a fluid inlet and a fluid outlet and a plurality of stages arranged in the casing. A flow path extends from the fluid inlet to the fluid outlet through the sequentially arranged stages. Each stage is comprised of a rotating impeller and an electric motor embedded in the casing and arranged for rotating the impeller at a controlled rotary speed. Each electric motor comprises a motor rotor, arranged on the impeller and integrally rotating therewith, and a motor stator stationarily arranged in the casing. Pairs of sequentially arranged impellers are configured for rotation in opposite directions.
摘要:
The invention provides a stator-side member which is arranged in a vacuum pump and which, without the provision of a heat insulation material, prevents the deposition of products at the lower side of a threaded groove pump unit, with this lower side being an area of high pressure where the deposition of products (deposits) occurs easily, and also provides a vacuum pump equipped with this stator-side member. A threaded groove spacer configured to have a coefficient of thermal conductivity lower than a predetermined value is arranged in a vacuum pump equipped with a threaded groove pump unit. (1) The threaded groove spacer is manufactured from a material having a coefficient of thermal conductivity lower than that of a member which opposes or comes into contact with the threaded groove spacer. Specifically, this material has a coefficient of thermal conductivity lower than that of aluminum or aluminum alloy, and is preferably any one of stainless steel, fiber-reinforced plastic, polyetherimide, and polyetheretherketone. (2) The threaded groove spacer is constituted by at least two or more parts.
摘要:
A closing cover (60) integrally includes a cover main body (60a), and a ventilation cap body (71). The ventilation cap body (71) has a connecting portion (73) that is integrally connected to the cover main body (60a), and at least one ventilation passage hole (72) that is disposed in the connecting portion (73) to perpendicularly extend, and has a depth smaller than a plate thickness of the cover main body (60a). A ventilation recessed portion (77) is formed at a location that is positioned on an inner surface of the ventilation cap body (71) of the closing cover (60). An inner wall surface (78) defining the ventilation recessed portion (77) is formed in such a shape that a deep side of the ventilation passage hole (72) is opened to the inner wall surface defining the ventilation recessed portion (77) to form a ventilation passage. A ventilation filter (80) is installed on an inner opening portion of the ventilation recessed portion (77).
摘要:
Die Erfindung betrifft eine Vakuumpumpe mit wenigstens einer Seitenkanalpumpstufe, die einen durch zumindest ein Statorelement begrenzten Seitenkanal umfasst, und mit einem Kühlmittelkreislauf zur Kühlung der Vakuumpumpe mit einem Kühlmittel, wobei der Kühlmittelkreislauf wenigstens einen Kühlmittelkanal für die Seitenkanalpumpstufe aufweist, der zumindest bereichsweise durch das Statorelement begrenzt ist.