Diesel Kiki Co., Ltd.

Zexel Gmbh

Susumu Saito

Hiroshi Nomura

Nobuyuki Nakajima

Masakuni Ishikawa

Susumu Echizen

Takeo Iijima

Nobukazu Takagi

Yukio Kazahaya

Kiyohiro Harada

Mototaka Shitara

Seiji Kuchiki

Seiji Sumikawa

A scroll type compressor including a drive shaft which is provided with a spiral groove formed in an external circumferential surface of the drive shaft. The spiral groove communicates diagonally between the oil space and the upper portion of the main bearing to ensure sufficient lubrication and sealing in the area where the drive shaft slide in contact with the main bearing. A seal bearing portion is positioned between the oil space and the low pressure space to isolate the oil space from the low pressure orbiting space, achieving an improvement in lubrication. The seal bearing portion is constituted with a seal washer, a seal bearing and a seal member, and, furthermore, with seal reinforcing material, to especially improve the seal between the oil space and the oscillation space.

Scroll type compressor having a seal bearing unit

A scroll compressor reduces the load applied to the thrust bearing, to prevent a thrust bearing from seizing and to improve the service life of the thrust bearing. It comprises an electric motor that is provided within a high pressure space inside a sealed case with a stator fixed within the sealed case and a rotor fixed to a drive shaft. An oscillating shaft is decentered on and extends from the drive shaft. An oscillating scroll member has an insertion hole into which the oscillating shaft is inserted. A fixed scroll member forms a compression space by fitting into the oscillating scroll member, and a block secures the fixed scroll member inside the sealed case and clamps the oscillating scroll member so that it can oscillate freely between the block and the fixed scroll member. The thrust bearing is provided between the drive shaft and the block to hold the lower end of the drive shaft so that it can rotate freely. The internal diameter of the thrust bearing is approximately equal to the external diameter of the oscillating shaft. As a result, the sliding contact surface at the thrust bearing can be reduced to an absolute minimum so that friction at the thrust bearing is reduced, thereby achieving the aforementioned objectives of reducing the load applied to the thrust bearing, preventing the thrust bearing from seizing and improving the service life of the thrust bearing.

Scroll type compressor having a thrust bearing for the drive shaft

In order to provide a simple structure to achieve sufficient lubrication and sealing in the various areas of a scroll compressor where sliding contact occurs, a spiral groove that communicates between a high-pressure side space and an area at an upper portion of a main bearing is formed on the external circumferential surface of the drive shaft where it comes in contact with and slides against the main bearing. A seal bearing is provided in a drive shaft-receiving block between the high-pressure side space and a low pressure side space to seal off the high-pressure side space from the low pressure side space. An oil supply hole is provided that communicates between the high-pressure side space and an oscillation space which is formed by an oscillating scroll member and an oscillating shaft. With this, a first oil passage that lubricates the main bearing and a second oil passage that lubricates an oscillating shaft-insertion hole are formed. A seal washer, the surface of which is polished to a specific roughness, is provided between the seal bearing and the drive shaft and, in addition, an elastic member is provided between the seal bearing and the block.

Scroll type compressor having an oil seal bearing for the drive shaft

To reduce a load applied to the thrust bearing, to prevent the thrust bearing from seizing and to improve the service life of the thrust bearing, the thrust bearing is provided between a drive shaft and a block to seal a high-pressure side space from a low-pressure side space. By providing an oil supply through hole, one end of which opens into high-pressure side space and the other end of which opens into a space formed by inserting the shaft into the insertion hole, high-pressure lubricating oil can be supplied to the space. The constric within the shaft with the effect of the constriction clearance is formed between the aforementioned oscillating shaft and the insertion hole, and a pressure differential between the two ends of the drive shaft is eliminated. Furthermore, by forming a circular oil groove at a sliding surface where the aforementioned thrust bearing and the drive shaft are in contact with each other and communicating channels that communicate between the circular oil groove and an external circumferential area of the aforementioned thrust bearing, the high-pressure lubricating oil is induced to the circular oil groove and the communicating channels to apply an upward force to the drive shaft.

Thrust bearing arrangement for a drive shaft of a scroll compressor

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 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

In an improved swash plate type compressor in which a first end block, holding a first valve plate against one end of the cylinder block, defines a first input plenum and an output plenum with input and output valve means for a first set of cylinder chambers, a partition plate is secured between the other end of the cylinder block and a second end block and holds a second valve plate against that end of the cylinder block, defining for a second set of cylinder chambers a second input plenum with input valve means and an output chamber with an output valve means. The second end block defines inlet and outlet buffering chambers to which an inlet and an outlet open. The cylinder block is formed with an input transfer passage communicated at its ends to the first and second input plenums. The partition plate is formed with an output transfer aperture for the output chamber, communicating it to the outlet buffering chamber. Also, a means communicates from the inlet buffering chamber to the input transfer passage. Thereby, input and output pulsations are well attenuated.

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Konan, Japan

Susumu Saito