Abstract: A pump includes a rotatable rotor installed in a motor part and at least one impeller installed in a pump part, capable of being rotated together with the rotor in unison. The rotor and the impeller are accommodated in a casing, and the impeller has an inlet at an inner periphery thereof and an outlet at an outer periphery thereof. A housing is arranged in both sides of an axial direction of the impeller and has an outer peripheral part coupled to the rotor at a rear side portion thereof, and the outer peripheral part is projected outwards further than a gap between an outer peripheral surface of the rotor and an inner peripheral surface of the casing in which the rotor is rotatably accommodated.

Abstract: A pump includes a pumping unit including therein an impeller for sucking and discharging a liquid; and a pump case accommodating therein the pumping unit and provided with an inlet for sucking the liquid into the pump and an outlet for discharging the liquid out of the pump. The impeller has an inlet mouth portion of a cylindrical shape that projects towards the pump case, and the pump case has a case inlet portion and an annular recess portion which the inlet mouth portion of the impeller is movably inserted in and is formed at the vicinity of the case inlet portion.

Abstract: A pump includes a rotatable rotor installed in a motor part and at least one impeller installed in a pump part, capable of being rotated together with the rotor in unison. The rotor and the impeller are accommodated in a casing, and the impeller has an inlet at an inner periphery thereof and an outlet at an outer periphery thereof. A housing is arranged in both sides of an axial direction of the impeller and has an outer peripheral part coupled to the rotor at a rear side portion thereof, and the outer peripheral part is projected outwards further than a gap between an outer peripheral surface of the rotor and an inner peripheral surface of the casing in which the rotor is rotatably accommodated.

Abstract: A cooling device includes a heat-radiating device and a centrifugal pump provided in a closed circulation passage for circulating refrigerant. The centrifugal pump contacts and absorbs heat from heat-generating electronic parts by heat exchange of the refrigerant therein to radiate the heat via the heat-radiating device. The centrifugal pump includes a lower casing that comes into contact with the heatgenerating electronic parts, an upper casing disposed to face the lower casing to form a pump chamber, and an impeller sandwiched between the upper casing and the lower casing. The lower casing includes a recessed conical surface facing the impeller, at least one protrusion provided in a center portion of the recessed conical surface and a contact face with which the heat-generating electronic parts come into contact formed directly below the protrusion on an opposite side of the recessed conical surface.

Abstract: A cooling device including a heat-radiating device and a centrifugal pump provided in a closed circulation passage for circulating refrigerant. The centrifugal pump comes into contact with heat-generating electronic parts to absorb heat from the heat-generating electronic parts by the heat exchange of the refrigerant therein to radiate the heat via the heat-radiating device. A pump chamber of the centrifugal pump is defined by a combination of a plurality of casings, that is, an upper casing, a ring-shaped sealing member and a lower casing. A contacting surface that comes in a surface contact with the heat-generating electronic parts, and a recessed conical surface that faces an impeller are formed in the lower casing of the casings that comes into a direct contact with the heat-generating electronic parts. A plurality of heat-radiating pins protruding toward the impeller is provided in a center portion of the recessed conical surface.

Abstract: Heat-shrinkable polyester films which exhibit a total light transmittance of 80% to 90% and a haze of 15% to 60%, both in a thickness of 50 &mgr;m and further exhibit a 45-degrees specular gloss of 70% or lower, so that they have frosted glass appearances without being printed or processed. Heat-shrinkable polyester films which exhibit a light transmittance of 0% to 20% at a wavelength of 380 nm and of 0% to 60% at a wavelength of 400 nm and further exhibit a haze of 15% or lower, so that they can prevent the contents of a vessel fitted therewith from being deteriorated by ultraviolet light and they have good shrinkage finish and particularly cause only rare occurrence of wrinkles, shrinkage spots, or other defects. These films are suitable for labels, particularly for labels of great product value.

Abstract: Heat-shrinkable polyester films which exhibit a total light transmittance of 80% to 90% and a haze of 15% to 60%, both in a thickness of 50 &mgr;m and further exhibit a 45-degrees specular gloss of 70% or lower, so that they have frosted glass appearances without being printed or processed. Heat-shrinkable polyester films which exhibit a light transmittance of 0% to 20% at a wavelength of 380 nm and of 0% to 60% at a wavelength of 400 nm and further exhibit a haze of 15% or lower, so that they can prevent the contents of a vessel fitted therewith from being deteriorated by ultraviolet light and they have good shrinkage finish and particularly cause only rare occurrence of wrinkles, shrinkage spots, or other defects. These films are suitable for labels, particularly for labels of great product value.