Horizontal type scroll compressor having inlet ports at an upper level of the casing

A horizontal type scroll compressor in which:

• a compression element (E) is accommodated at a side area in a horizontal type closed casing (1) and a motor (M) is accommodated at another side area in the closed casing (1);
• the compression element (E) has a fixed scroll (2) and a movable scroll (3) each of which is so composed that a volute (2b, 3b) is formed on the front of an end plate (2a, 3a), and is so composed that both the volutes (2b, 3b) of the fixed scroll (2) and the movable scroll (3) are engaged with each other, both the scrolls (2, 3) having therebetween a plurality of compression rooms (RA, RB) formed in pairs;
• the motor (M) is connected to the movable scroll (3) so as to move the movable scroll around the axis of the fixed scroll (2);
• and
• an inlet pipe (11) opens between the compression element (E) and the motor (M) in an inner space (12) of the closed casing (1),
• characterized in that:
• an external end of the volute (2b) of the fixed scroll (2) is extended near to an external end of the volute (3b) of the movable scroll (3) in order that inlet ports (22, 23) of the pair of compression rooms (RA, RB) are located near to each other;
• both the scrolls (2, 3) are so disposed that the inlet ports (22, 23) are located at an upper level of the closed casing (1) and the inlet ports are formed for being opened and closed by the movement of the external ends of the volutes in association with the revolution of the volute (3b) of the movable scroll (3) so that compression begins when the inlet ports are closed;
• a housing (4) for dividing the inner space (12) into a compression element chamber (12A) and a motor chamber (12B) is provided between the compression element (E) and the motor (M);
• the inlet pipe (11) opens to the motor chamber (12B);
• an inlet passage (24) communicating with an inlet part to which the inlet ports (22, 23) open is formed at the top of the housing (4);
• and
• the housing is provided with an oil backing passage (25) which communicates with the compression element chamber (12A) and the motor chamber (12B) and has a set flow resistance.