Rotary expansible chamber devices – Working member has planetary or planetating movement – Helical working member – e.g. – scroll
Patent
1996-02-12
1997-11-04
Vrablik, John J.
Rotary expansible chamber devices
Working member has planetary or planetating movement
Helical working member, e.g., scroll
418 556, 418 96, F04C 1804, F04C 2300, F04C 2902
Patent
active
056832370
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a horizontal type scroll compressor and specifically relates to a compressor in which a fixed scroll is engaged with a movable scroll and these fixed and movable scrolls each have an end plate and a volute.
As a conventional horizontal type scroll compressor used for a refrigerating apparatus or the like, there is well known a compressor as disclosed in the Japanese Patent Application Laid-Open Gazette No.6-66274.
As shown in FIG. 5, this scroll compressor is so formed that a horizontal type closed casing (C) accommodates at one side thereof a compression element (E) and at the other side a motor (M). The compression element (E) has a fixed scroll (FS) and a movable scroll (OS) each of which is so composed that a volute is formed on the front of an end plate. Both the volutes of the fixed scroll (FS) and the movable scroll (OS) are engaged with each other.
The motor (M) is connected to the end plate of the movable scroll (OS) through a driving shaft (S). The driving shaft (S) is supported at a compression element (E) side end thereof to the closed casing (C) through a first bearing housing (H) and is supported at the other end to the closed casing (C) through a second bearing housing which is not shown.
Meanwhile, the closed casing (C) is connected to an inlet pipe (J) which opens to an inner space (A) between the compression element (E) and the motor (M).
Further, the first bearing housing (H) is provided with a divider (B) made of flexible material such as rubber for separating the inlet side of the compression element (E) and the inner space (A). In addition, at the top of the first bearing housing (H), there is formed an inlet passage (D) for providing communication between the inner space (A) and the inlet side of the compression element (E).
At the back of the fixed scroll (FS), there is provided a partition (F) whereby a discharge chamber (G) is formed. A discharge port (P) opens to the discharge chamber (G). The discharge chamber (G) is communicated with a discharge pipe (K).
Compressing operation of the above scroll compressor is as follows.
When the motor (M) is first activated, the movable scroll (OS) does not rotate on but travels around the axis of the fixed scroll (FS). Thus, for example, low-pressure gas refrigerant returning from an evaporator of a refrigerating apparatus flows into the inner space (A) of the closed casing (C) through the inlet pipe (J).
The gas refrigerant flows out of the inner space (A), passes through the inlet passage (D), flows into the compression element (E) and is then compressed by the compression element (E) to turn high-pressure gas refrigerant. Thereafter, this high-pressure gas refrigerant flows out of the compression element (E), flows into the discharge chamber (G) through the discharge port (P) and is fed to a condenser through the discharge pipe (K).
Problems to be solved
In the above conventional horizontal type scroll compressor, there is a displacement of 180.degree. between both the external ends of the volutes of the fixed scroll (FS) and the movable scroll (OS). This naturally presents a displacement of 180.degree. between two inlet ports of compression rooms formed between the volutes of both the scrolls (FS, OS).
Accordingly, in the conventional horizontal type scroll compressor, when the inlet port of one of the compression rooms is positioned at an upper level in the horizontal type closed casing (C), the inlet port of the other compression room is located at a lower level in the closed casing (C).
Meanwhile, in a refrigerating apparatus with the above horizontal type scroll compressor, when defrosting operation is conducted in a reverse cycle by feeding discharged gas refrigerant to the evaporator or when switching is then made to normal operation so as to feed the discharged gas refrigerant to the condenser, a large amount of liquid refrigerant may return from the evaporator to the closed casing (C).
At this time, as mentioned above, since one inlet port is located at the lower level in the closed casing (C), a pass of
Hagiwara Shigeki
Jomura Shuichi
Obitani Takekazu
Ueno Hiromichi
Brackett Jr. Tim L.
Daikin Industries Ltd.
Ferguson Jr. Gerald J.
Vrablik John J.
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