Diesel Kiki Co., Ltd.

Fuji Koki Manufacturing Co., Ltd.

Hiroshi Nomura

Susumu Saito

Susumu Echizen

Takeo Iijima

Takashi Koike

Juetsu Kurosawa

Mototaka Shitara

A compressor of a type in which a plurality of pistons reciprocate in cylinders, the improved compressor in which a mechanism is provided to reduce pulsating of suction pressure in a cylinder head. The inside of the cylinder head is partitioned into a first low pressure chamber and a second low pressure chamber and a high pressure chamber by means of a partitioning means. The first low pressure chamber is communicated with a suction opening formed on the cylinder head, and the second low pressure chamber is communicated with a plurality of suction holes formed on a low pressure chamber are communicated by means of the suction communication hole formed on the partitioning means, and each of the suction communicating holes is positioned at an equal distance from the two suction holes, and the phase difference is provided on the pulsating produced by the passing of the gas through the suction opening.

Compressor having pulsating reducing mechanism

A variable capacity wobble plate compressor in which pressure in a crankcase accomodating a wobble plate is controlled by a pressure-control valve disposed across a communication passage connecting the crankcase and a suction chamber, whereby the delivery quantity or capacity is varied with a change in the inclination angle of the wobble plate depending on the pressure in the crankcase. The pressure-control valve comprises bellows variable in length with a change in the magnituted of suction pressure, a valve body attached to one end of the bellows, a first movable member attached to the other end of the bellows, a first spring urging the valve body in the closing direction, a second movable member which is brought into or out of urging contact with the first movable member in response to at least a change in the discharge pressure, and a second spring interposed between the second movable member and a spring seat. When the discharge pressure is higher than a predetermined value, the second movable member is biased away from the first movable member by the discharge pressure against at least the force of the second spring. When the discharge pressure is lower than the predetermined value, the second movable member is urged against the first movable member by at least the force of the second spring against the discharge pressure to urge the valve body in the closing direction via the first movable member, the first spring and the bellows.

Variable capacity wobble plate compressor

A compressor of a type in which a plurality of pistons reciprocate in cylinders. A mechanism is provided to reduce pulsating of discharge pressure in the cylinder head. A high pressure chamber formed in the cylinder head is partitioned by a partition plate into a first high pressure chamber communicating with a plurality of discharge holes in the valve plate by means of a discharge valve and a second high pressure chamber communicated with a discharge opening formed in the cylinder head, and the pulsating is reduced by the passing of the gas through the first high pressure chamber and the second high pressure chamber.

A swash-plate type rotary compressor includes a plurality of cylinders disposed in circumferentially equi-distantly spaced relation to each other around a drive shaft having mounted thereon a swash plate for rotation therewith. The swash plate is rotated to cause pistons to be slidingly reciprocated in the respective cylinders to draw gas containing lubricant and to compress same. Guide walls are provided on both sides of a swash plate chamber for guiding gas introduced into the swash plate chamber to flow over entire side surfaces of the swash plate from an outer periphery toward a center thereof. A plurality of gas guiding passageways are each located between each pair of adjacent cylinders, for guiding the gas flowing to a central portion of the swash plate into at least one low pressure space.

Swash-plate type rotary compressor with lubrication of swash plate and

A compressor of a type in which a plurality of pistons reciprocate in cylinders, the improved compressor in which a mechanism is provided to reduce pulsating of suction pressure in the cylinder head. The inside of the cylinder head is partitioned into a high pressure chamber on the side of the center and a low pressure chamber on the side of the periphery by means of bulkhead formed on the cylinder head. The low pressure chamber communicates the suction holes and the discharge opening formed on the cylinder head. The outer peripheral wall of the low pressure chamber is arranged to reduce a resistance of gas passing through the low pressure chamber as the convex portion constituting the periphery of the connecting bolt and the concave portion constituting the peripheries of the suction holes are connected by means of a connecting portion having a smooth curved surface.

A piston seal device for a reciprocating compressor, having a piston slidably mounted in a cylinder bore and having a circumferential groove, and a resilient piston ring fitted in the circumferential groove of the piston and sealingly engageable with the cylinder bore. The circumferential groove includes a centrally recessed bottom wall for causing the piston ring to be resiliently and arcuately deformed to have a pair of opposite outer corner edges sealingly engageable with the cylinder bore. The piston sealing device thus provides a great sealing force both at the discharge stage and the intake stage, thereby improving the efficiency and lubrication of the compressor.

Piston seal device for reciprocating compressor

Double-headed pistons received within cylinder bores in the cylinder block are in engagement with the swash plate via shoes and balls. The pistons each have its intermediate bridge portion formed with at least one lubricating oil-guiding hole extending therethrough from a side surface of the same portion facing the inner peripheral surface of the cylinder bore to the opposite side surface facing the outer fringe of the swash plate. The bridge portion of each piston may also be formed with an axially extending lubricating oil-guiding groove joined at one end to the lubricating oil-guiding hole.

Swash-plate type compressor having improved lubrication of swash plate

An improved swash-plate type compressor including a pair of thrust bearings interposed between the swash plate and central seat portions provided on the cylinder blocks forming the outer frame of the compressor, characterized by that a retainer is interposed between the bearing ring of each of said thrust bearings on the cylinder block side and associated one of said central seat portions, wherein the bearing ring has a periphery thereof formed with at least one engaging cut, while the retainer has opposite end faces thereof formed with at least one first engaging protuberance and at least one second engaging protuberance for engagement with said engaging cut and an associated end of corresponding one of spaces axially formed through the cylinder blocks, respectively. Rotation of said bearing ring can thus be prevented with respect to the central seat portion of the cylinder block to avoid abrasion in the opposed faces of the two members.

Swash-plate type compressor

A drive shaft (17) is rotatably supported in a cylinder (12) by means of bearings (28), (29). A swash plate (24) fixed to the shaft (17) causes a piston (33) to reciprocate in a bore (18), (23) of the cylinder (12) upon rotation of the drive shaft (17) and swash plate (24). The piston (33), in combination with inlet (113) and outlet (58) valves communicating with the cylinder bore (18), (23) cause refrigerant fluid or the like to be compressively displaced through the bore (18), (23) and compressor (11). Passageways (123), (124) connect the cylinder bore (18), (23) to the bearings (28), (29) in such a manner that lubricant oil entrained in the refrigerant is forced by refrigerant pressure in the bore (18), (23) through the passageways (123), (124) to positively lubricate the bearings (28), (29 ) even during startup of the compressor (11).

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Konan, Japan

Hiroshi Nomura