초록 ▼

A multi-stage compression refrigeration apparatus (10) includes a compressor having a first stage low-pressure compression means (32) and a second stage high-pressure compression means (34), a condenser (1), a first decompression means (3), an intercooler (6), a second decompression means (7), and a

A multi-stage compression refrigeration apparatus (10) includes a compressor having a first stage low-pressure compression means (32) and a second stage high-pressure compression means (34), a condenser (1), a first decompression means (3), an intercooler (6), a second decompression means (7), and an evaporator (8). The refrigerant discharged from the condenser (1) is diverted into first and second parts, with the first part passed to the intercooler (6) via the first decompression means (3) while the second part is passed to the evaporator (8) via the second decompressor (7). The refrigerant passed to the second decompressor (7) undergoes heat exchange with the intercooler (6). The refrigerant discharged from the evaporator (8) is fed to the low-pressure compression means (32). The refrigerant discharged from the intercooler (6) is fed to the high-pressure compression means (34) together with the refrigerant discharged from the low-pressure compression means. The apparatus further comprises a second intercooler (5) downstream of the evaporator (8) so that the second diverted part of the refrigerant may undergo heat exchange in the intercooler (5) prior to entering the evaporator. The inventive apparatus thus may perform refrigeration with an improved efficiency during an early stage of its startup.

대표청구항 ▼

A multi-stage compression refrigeration apparatus (10) includes a compressor having a first stage low-pressure compression means (32) and a second stage high-pressure compression means (34), a condenser (1), a first decompression means (3), an intercooler (6), a second decompression means (7), and a

A multi-stage compression refrigeration apparatus (10) includes a compressor having a first stage low-pressure compression means (32) and a second stage high-pressure compression means (34), a condenser (1), a first decompression means (3), an intercooler (6), a second decompression means (7), and an evaporator (8). The refrigerant discharged from the condenser (1) is diverted into first and second parts, with the first part passed to the intercooler (6) via the first decompression means (3) while the second part is passed to the evaporator (8) via the second decompressor (7). The refrigerant passed to the second decompressor (7) undergoes heat exchange with the intercooler (6). The refrigerant discharged from the evaporator (8) is fed to the low-pressure compression means (32). The refrigerant discharged from the intercooler (6) is fed to the high-pressure compression means (34) together with the refrigerant discharged from the low-pressure compression means. The apparatus further comprises a second intercooler (5) downstream of the evaporator (8) so that the second diverted part of the refrigerant may undergo heat exchange in the intercooler (5) prior to entering the evaporator. The inventive apparatus thus may perform refrigeration with an improved efficiency during an early stage of its startup. ity laser light source according to claim 1, wherein said wavelength selection element includes a diffraction grating. 4. The external cavity laser light source according to claim 1, further comprising a rotating mechanism for rotating said wavelength selection element by a predetermined angle. 5. The external cavity-laser light source according to claim 1, further comprising a slide stage for moving said wavelength selection element by a predetermined distance in a direction perpendicular to an optical axis of said light emitting element. 6. The external cavity laser light source according to claim 1, wherein said optical branch element includes an unporalized light beam splitter. 7. The external cavity laser light source as claimed in claim 1, wherein the optical branch element has a reflection surface facing between the wavelength selection element and the output direction, the reflection surface to reflect the selected light sent directly from the wavelength selection element to be output as the output light beam. 8. An external cavity laser light source comprising: a light emitting element for emitting a first light beam having a first wavelength distribution; a diffraction grating for selecting a wavelength of the first light beam and for returning a second light beam having a second wavelength distribution different from the first wavelength distribution to said light emitting element; and a multiple-surface reflecting mirror having a first reflecting surface for reflecting the first light beam wavelength selected by the diffraction grating and again introducing the first light beam onto the diffraction grating, and a second reflecting surface different in surface angle from the first reflecting surface, the second reflecting surface for reflecting the first light beam to be taken out as an output light beam. 9. The external cavity laser light source according to claim 8, wherein said light emitting element includes a semiconductor laser element. 10. An external cavity laser light source comprising: a light emitting element for emitting a first light beam having a first wavelength distribution; a wavelength selection element for selecting a wavelength of the first light beam and for returning a second light beam having a second wavelength distribution different from the first wavelength distribution to said light emitting element, the wavelength selection element including a diffraction grating for diffracting the first light beam for selection of a wavelength thereof and a mirror for reflecting the first light beam diffracted by said diffraction grating to resend the first light beam to said diffraction grating, whereby the first light beam is diffracted by the diffraction grating twice and outputted as the second light beam; and an optical branch element arranged between said light emitting element and said wavelength selection element, wherein the optical branch element branches the second light beam in an output direction to be taken out as an output light beam, and the output light beam contains no component of the first light beam directly emitted from the light emitting element. 11. The external cavity laser light source as claimed in claim 10, wherein the optical branch element has a reflection surface facing between the wavelength selection element and the output direction, the reflection surface to reflect the selected light sent directly from the wavelength selection element to be output as the output light beam.