Abstract: A power converter includes first and second components on which male and female fitting members of each of a plurality of pairs of fitting members are arranged, with a pair of first alignment keys formed in the first and second components as reference positions. The first and second components are coupled to each other by the female fitting member clamping an insertion portion of the male fitting member inserted between first and second clamping portions of the female fitting member arranged so as to face each other in a state where the pair of first alignment keys are positionally aligned. The first and second clamping portions are each bent so as to form one of protrusions toward one of surfaces thereof facing each other. A gap is formed in a distal end portion of each of the first and second clamping portions.

Abstract: An electric power converter includes a first board, a second board, and a first board-to-board connector that electrically and mechanically connects the first board and the second board. The first board-to-board connector includes a male fitting member and a female fitting member. Each of a first clamp portion and a second clamp portion of the female fitting member includes a first contact forming portion and a second contact forming portion that are curved in a protruding shape, and a first spring portion and a second spring portion that are connected to the first contact forming portion and the second contact portion, respectively, and that are curved in corrugated shapes. An insert clamped between the first contact forming portion and the second contact forming portion forms an electrical contact, and the first spring portion and the second spring portion are independently deformable.

Abstract: A compressor includes a compression mechanism and a drive shaft having an oil supply hole opened through an outer peripheral surface of the drive shaft to supply oil to a bearing surface of the drive shaft. An oil discharge passage communicating with the oil supply hole is formed by a flat surface or a recessed surface at a portion of the outer peripheral surface of the drive shaft. A trailing edge of the oil discharge passage is displaced behind a trailing edge of the oil supply hole with respect to a rotation direction of the drive shaft. A leading edge of the oil discharge passage is displaced behind a leading edge of the oil supply hole with respect to the rotation direction of the drive shaft. The oil discharge passage has a width that is no larger than a diameter of the oil supply hole.

Abstract: A compressor includes a compression mechanism and a drive shaft having an oil supply hole opened through an outer peripheral surface of the drive shaft to supply oil to a bearing surface of the drive shaft. An oil discharge passage communicating with the oil supply hole is formed by a flat surface or a recessed surface at a portion of the outer peripheral surface of the drive shaft. A trailing edge of the oil discharge passage is displaced behind a trailing edge of the oil supply hole with respect to a rotation direction of the drive shaft. A leading edge of the oil discharge passage is displaced behind a leading edge of the oil supply hole with respect to the rotation direction of the drive shaft. The oil discharge passage has a width that is no larger than a diameter of the oil supply hole.

Abstract: A scroll compressor includes a fixed scroll, an orbiting scroll and an injection passage. Each scroll has an end plate and a spiral lap. The scrolls mesh with each other to form a compression chamber. The injection passage supplies intermediate pressure refrigerant and refrigeration oil separated from discharged refrigerant to the compression chamber. At least one of the scrolls has a bottom land facing the lap of the other of the scrolls. The bottom land has an intermediate bottom region facing a part of the compression chamber communicating with the injection passage, and a suction side bottom region located closer to an outer end of the lap than the intermediate bottom region. A clearance between the suction side bottom region and the end face of the lap is larger than a clearance between the intermediate bottom region and the end face of the lap.

Abstract: A scroll compressor includes a fixed scroll, an orbiting scroll and an injection passage. Each scroll has an end plate and a spiral lap. The scrolls mesh with each other to form a compression chamber. The injection passage supplies intermediate pressure refrigerant and refrigeration oil separated from discharged refrigerant to the compression chamber. At least one of the scrolls has a bottom land facing the lap of the other of the scrolls. The bottom land has an intermediate bottom region facing a part of the compression chamber communicating with the injection passage, and a suction side bottom region located closer to an outer end of the lap than the intermediate bottom region. A clearance between the suction side bottom region and the end face of the lap is larger than a clearance between the intermediate bottom region and the end face of the lap.

Abstract: In a rotary compressor to perform oil supplying to bearings through a main oil-supply passage formed in a drive shaft by making use of pressure differential between high-level pressure and low-level pressure in the casing, sealing portions having air-tight structures are formed at both sides in the axis direction of each of the sliding faces constituted between the drive shaft and the bearings, putting bearing-portion oil-supply passages between the sealing portions, to improve the reliability of the bearings by preventing high-pressure gas flowing into a portion between the drive shaft and the bearings.

Abstract: Disclosed is an enclosed type compressor in which a scroll type compression mechanism and an electric motor are attached firmly to a casing, with the scroll type compression mechanism and the electric motor in contact with an inner face of the casing. Formed in a plane orthogonal to the longitudinal direction of the casing are a contact part of the casing which makes contact with the scroll type compression mechanism (the electric motor) and a non-contact part of the casing which does not make contact with the scroll type compression mechanism (the electric motor). The non-contact part with respect to the scroll type compression mechanism has a peripheral length different from that of the non-contact part with respect to the electric motor.

Abstract: Formed in a scroll type compression mechanism is a connection passageway with a discharge opening through which refrigerant compressed by the compression mechanism flows out into a clearance space defined between the compression mechanism and a drive motor. A muffler space in communication with the connection passageway that is configured to reduce operating noise is formed in the compression mechanism. A motor cooling passageway configured to circulate working fluid which has flowed out into the clearance space is formed between the drive motor and an inner surface area of a casing. A guide plate is disposed in the clearance space. Formed in the guide plate is a flow dividing concave portion which causes a part of refrigerant flowing toward the motor cooling passageway to be distributed in a circumferential direction and toward an internal end of a discharge pipe located in the clearance space.

Abstract: In a rotating compressor, an outer peripheral surface of a partition member which is secured firmly to a casing so as to divide the inside of the casing into a high-level pressure space and a low-level pressure space, is provided with a peripheral groove for allowing for shrinkage of the casing at a weld area where a trunk part and end plate of the casing are welded together. As a result of such arrangement, the partition member is strongly tightened by making utilization of such shrinkage, thereby not only enhancing sealability between the high-level pressure space and the low-level pressure space in the inside of the casing but also preventing a drop in workability during assembling and an increase in cost.

Abstract: Disclosed is an enclosed type compressor (1) in which a scroll type compression mechanism (2) and an electric motor (3) are attached firmly to a casing (6), with the scroll type compression mechanism (2) and the electric motor (3) in contact with an inner face of the casing (6). Formed in a plane orthogonal to the longitudinal direction of the casing (6) are a contact part (20, 21) of the casing (6) which makes contact with the scroll type compression mechanism (2) (the electric motor (3)) and a non-contact part (30, 31) of the casing (6) which does not make contact with the scroll type compression mechanism (2) (the electric motor (3)). The non-contact part (30) with respect to the scroll type compression mechanism (2) has a peripheral length different from that of the non-contact part (31) with respect to the electric motor (3).

Abstract: In a rotary compressor to perform oil supplying to bearings (32,34,45) through a main oil-supply passage (51) formed in a drive shaft (17) by making use of pressure differential between high-level pressure and low-level pressure in the casing (10), sealing portions (65) having air-tight structure is formed at the both sides in the axis direction of each of sliding faces constituted between the drive shaft (17) and the bearings (32,34,45), putting bearing-portion oil-supply passages (59,60,61) between the sealing portion (65), to improve the reliability of the bearings (32,34,45) by preventing high-pressure gas flowing into a portion between the drive shaft (17) and the bearings (32,34,45).

Abstract: Formed in a scroll type compression mechanism is a connection passageway with a discharge opening through which refrigerant compressed by the compression mechanism flows out into a clearance space defined between the compression mechanism and a drive motor. A muffler space in communication with the connection passageway that is configured to reduce operating noise is formed in the compression mechanism. A motor cooling passageway configured to circulate working fluid which has flowed out into the clearance space is formed between the drive motor and an inner surface area of a casing. A guide plate is disposed in the clearance space. Formed in the guide plate is a flow dividing concave portion which causes a part of refrigerant flowing toward the motor cooling passageway to be distributed in a circumferential direction and toward an internal end of a discharge pipe located in the clearance space.

Abstract: In a rotating compressor, an outer peripheral surface (40) of a partition member (23) which is secured firmly to a casing (10) so as to divide the inside of the casing (10) into a high-level pressure space and a low-level pressure space, is provided with a peripheral groove (42) for allowing for shrinkage of the casing (10) at a weld area where a trunk part (11) and end plate (12) of the casing (10) are welded together. As a result of such arrangement, the partition member (23) is strongly tightened by making utilization of such shrinkage, thereby not only enhancing sealability between the high-level pressure space and the low-level pressure space in the inside of the casing (10) but also preventing a drop in workability during assembling and an increase in cost.

Abstract: A fixed scroll (2) and a movable scroll (4) form a compression chamber (16). A first back pressure chamber (14) is formed on the back surface of the movable scroll (4). The first back pressure chamber receives a fluid of a discharge pressure. An unloader mechanism (11) is provided for guiding refrigerant gas from the compression chamber (16a) in the process of compression toward a suction port (13). A control part (31) is provided for controlling the unloader mechanism (11). When separating force is to exceed pressing force, the control part detects this and operates the unloader part for guiding the fluid from the compression chamber in the process of compression toward the suction part. Thus obtained is a scroll compressor attaining relatively sufficient pressing force by reducing separating force also when pressing force is reduced and suppressing internal leakage.

Abstract: In a scroll type compressor (1) that includes a fixed scroll (21) fixed inside of a casing (10) and a movable scroll (22) meshed with the fixed scroll (21) and presses the movable scroll (22) against the fixed scroll (21), the pressing force of the movable scroll (22) against the fixed scroll (21) is obtained from the pressure of a high-pressure space (S2) that acts on the back face of the movable scroll (22) and the pressing force is controlled in accordance with the variation in the compression ratio with the change in the operating condition thereby preventing decrease in efficiency and mechanical loss.

Abstract: A porous bronze 1b and a resin 1c impregnated in pores of the porous bronze 1b formed on a backing metal 1a constitute a bearing 1. At a surface to be brought into contact with a crank shaft 5, porous bronze 1b and resin 1c are sparsely exposed. Ratio of area of exposure of porous bronze 1b at the contact surface 1d is at least 5% and at most 60%. Thus a bearing for a refrigerating compressor having high seizure resistance at the time of boundary lubrication and having small amount of wear caused by sliding as well as a refrigerating compressor employing the same can be obtained.

Abstract: An oil separator for a compressor according to the present invention is an oil separator (33) for separating oil flowing into a high-pressure chamber (21a) from a low-pressure chamber (21b) with a compression medium in a compressor from the compression medium, and comprises a demister (33a) which is in the form of a net formed by braiding metal thin wires and has surfaces subjected to sandblasting. Due to this structure, an oil separator for a compressor not reducing oil separability also in case of employing an HFC refrigerant and ether oil in combination with each other is implemented. The demister (33a) is formed by performing sandblasting on both front and rear surfaces of a netted strip (33a) and thereafter annularly winding the strip.

Abstract: A lubricant (L) is stored in a lubricant reservoir (2c) of a casing (2). One end of a lubricant takeout pipe (15) is in communication with the lubricant reservoir (2c) and the other end thereof is in communication with a suction chamber (14) of a scroll mechanism (3). An inlet end of the lubricant takeout pipe (15) opens at the same level as an oil-level high-limit point of the lubricant reservoir (2c) in the vicinity of a lower end of a rotor (9b). When the level of the lubricant (L) moves up to the high-limit point, an excess lubricant is introduced from the lubricant reservoir (2c) into the scroll mechanism (3), since there is produced a difference in pressure between a lower space (2b) of the casing (2) and the suction chamber (14). As a result, the level of the lubricant (L) drops.