SCROLL COMPRESSOR

PURPOSE:To reduce the noise at operation of a back pressure control valve by providing an interference material other than metal or a member having spring property between the needle of the needle valve and the needle presser in a back pressure control valve. CONSTITUTION:This back pressure control...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: SEKIGUCHI KOICHI, WAKANA TATSUYA, SHIMADA ATSUSHI
Format: Patent
Sprache:eng
Schlagworte:
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Beschreibung
Zusammenfassung:PURPOSE:To reduce the noise at operation of a back pressure control valve by providing an interference material other than metal or a member having spring property between the needle of the needle valve and the needle presser in a back pressure control valve. CONSTITUTION:This back pressure control valve provided around a fixed scroll 2 is composed of a needle 21, a spring 24, a needle presser 25 working so that the needle 21 does not spring out, and an interference member 22 interposed between the needle 21 and the needle presser 25, and this controls discharge pressure 19, middle pressure 18, and suction pressure 17. That is, in case of normal operation (discharge pressure 19 spring force+middle pressure 18), the needle 21 is pressed down to close a middle pressure chamber and a suction chamber. On the other hand, in case that the pressure difference is small with low-speed operation (discharge pressure 19>spring force+middle pressure 18), the needle 21 is pushed up to connect the middle pressure chamber with the suction chamber, but at this time, in the upward and downward movement of the needle 21, noise is reduced by the contact with the interference material.