US3888604A — Compressor for a refrigerating machine

Claim 1

Independent Claim 150 words

A compressor for a refrigerating machine in which rotary movements of a drive shaft are converted into reciprocatory movements of pistons in a crankcase and a refrigerant in a gaseous state is drawn by suction and compressed by a combination of pistons, cylinders, and inlet and discharge valve means, the compressor comprising passage means for maintaining the interior of the crank-case in communication with a low pressure gas passage on the suction side, and oil separating means disposed in said passage means for separating and recovering oil for lubricating the compressor from blow-by gas flowing from the crank-case to said low pressure gas passage including at least two balance holes, each of said balance holes having a small cross sectional area, and an oil separating chamber having a passage disposed between said balance holes, said passage being of a larger cross sectional area than each of said two balance holes.

Claim 2

Dependent Claim 150 words

A compressor for a refrigerating machine in which rotary movements of a drive shaft are converted into reciprocatory movements of pistons in a crankcase and a refrigerant in a gaseous state is drawn by suction and compressed by a combination of pistons, cylinders, and inlet and discharge valve means, the compressor comprising passage means for maintaining the interior of the crank-case in communication with a low pressure gas passage on the suction side, and oil separating means disposed in said passage means for separating and recovering oil for lubricating the compressor from blow-by gas flowing from the crank-case to said low pressure gas passage including at least two balance holes, each of said balance holes having a small cross sectional area, and an oil separating chamber having a passage disposed between said balance holes, said passage being of a larger cross sectional area than each of said two balance holes.

Claim 3

Dependent Claim 93 words

A compressor according to claim 1, wherein oil separating chambers are disposed between the crank-case and the low pressure gas passage, said at least two balance holes being disposed between said oil separating chambers and the crank-case substantially at an upper end of each of the oil separating chambers and communicating with said crank-case, and wherein at least two further balance holes are disposed between the oil separating chamber and the low pressure gas passage substantially at the upper end of each oil separating chamber and communicating with the low pressure gas passage.

Claim 4

Dependent Claim 29 words

A compressor according to claim 2, wherein the cross-sectional area of said two further balance holes is larger than the cross-sectional area of said at least two balance holes.

Claim 5

Dependent Claim 26 words

A compressor according to claim 3, wherein said at least two balance holes and said two further balance holes are disposed substantially at the same level.

Claim 6

Dependent Claim 24 words

A compressor according to claim 3, wherein said two further balance holes are disposed at a level above said at least two balance holes.

Claim 7

Dependent Claim 47 words

A compressor according to claim 3, wherein the compressor includes cylinder heads, the low pressure passage communicates with low pressure chamber means provided in the cylinder heads, and wherein a suction port is provided in one of the cylinder heads for introducing the refrigerant into the compressor.

Claim 8

Dependent Claim 32 words

A compressor according to claim 3, wherein a suction port is provided for introducing the refrigerant into the compressor, said suction port being disposed substantially centrally of said two further balance holes.

Claim 9

Dependent Claim 205 words

A compressor of the swash plate type for a refrigerating machine in which an inclined disc secured to a drive shaft and pistons each slidably received in a cylinder are operatively connected to one another in a crank-case formed in a cylinder block so as to convert rotary movements of the drive shaft into reciprocatory movements of the pistons, inlet and discharge valve means for controlling gas pressure within the compressor, and a low pressure gas passage is formed to communicate with the cylinders at their suction side, such compressor comprising oil separating chambers interposed between said crank-case and said low pressure gas passage, a first set of balance holes formed between the oil separating chambers and the crank-case and each disposed near the upper end of each oil separating chamber to maintain the oil separating chambers in communication with the crank-case, and a second set of balance holes formed between the oil separating chambers and the low pressure gas passage and each disposed near the upper end of each oil separating chamber to maintain the oil separating chambers in communication with the low pressure gas passage, said oil separating chambers each being formed with an oil return opening formed at a lower portion thereof.

Claim 10

Dependent Claim 205 words

A compressor of the swash plate type for a refrigerating machine in which an inclined disc secured to a drive shaft and pistons each slidably received in a cylinder are operatively connected to one another in a crank-case formed in a cylinder block so as to convert rotary movements of the drive shaft into reciprocatory movements of the pistons, inlet and discharge valve means for controlling gas pressure within the compressor, and a low pressure gas passage is formed to communicate with the cylinders at their suction side, such compressor comprising oil separating chambers interposed between said crank-case and said low pressure gas passage, a first set of balance holes formed between the oil separating chambers and the crank-case and each disposed near the upper end of each oil separating chamber to maintain the oil separating chambers in communication with the crank-case, and a second set of balance holes formed between the oil separating chambers and the low pressure gas passage and each disposed near the upper end of each oil separating chamber to maintain the oil separating chambers in communication with the low pressure gas passage, said oil separating chambers each being formed with an oil return opening formed at a lower portion thereof.

Claim 11

Dependent Claim 138 words

A compressor of the swash plate type for a refrigerating machine according to claim 8 in which said oil separating chambers provided between the crank-case and the low pressure gas passage are closed and equal to each other in dimensions, said balance holes of the first set maintaining an upper portion of the crank-case in communication with upper portions of the oil separating chambers are small in size, and said balance holes of the second set formed between the oil separating chambers and the low pressure gas passage to maintain them in communication with one another are disposed in upper portions of the oil separating chambers in positions in which they are spaced apart from the balance holes of the first set so as to greatly vary the directions of streams of the refrigerant in a gaseous state.

Claim 12

Dependent Claim 214 words

A compressor of the swash plate type according to claim 9 further comprising a cylinder block consisting of a pair of cylinder block elements of equal size and shape and built in a shell, a pair of cylinder heads each cylinder head being secured to one of opposite ends of said cylinder block through a valve plate interposed therebetween, and low pressure chambers each defined in one of said cylinder heads, said low pressure gas passage being formed in a portion of said cylinder block in which no cylinders are formed and which is formed with a recess so that the low pressure gas passage is defined by a bottom and walls of the recess and the shell, said oil separating chambers being formed in spaces formed below opposite end portions of said recess with partitions being disposed between said spaces and said low pressure gas passage so that each said oil separating chamber is defined between one of the valve plates and one outer wall of the crank-case, said valve plates each being formed therein with a suction port so as to maintain each of said low pressure chambers in communication with the low pressure gas passage, and said second set of balance holes being disposed in close proximity to said valve plates.

Claim 13

Dependent Claim 73 words

A compressor of the swash plate type for a refrigerating machine according to claim 8 wherein one of said oil return openings formed in the lower portions of said oil separating chambers is maintained in communication with a needle bearing portion arranged between the drive shaft and the cylinder block and the other oil return opening is maintained in communication with a mechanical seal portion arranged near one end of the drive shaft.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1978-06-09	1978-12-09	1979-06-10	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1982-06-09	1982-12-09	1983-06-10	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1986-06-09	1986-12-09	1987-06-10	$7700.00	Window Closed / Lapsed

Compressor for a refrigerating machine

Abstract

Inventors

Bibliographic Details

Claims Analysis

References Cited (Backward Citations)

USPTO Annuity & Maintenance Windows

Assigned Categories & Tags

Assign Category Tag