This hermetic refrigerant compressor comprises: a hermetic container; refrigerator oil that is stored inside the hermetic container and has a kinematic viscosity at 40°C that is within the range of 1.0 mm2/s to 2.5 mm2/s; a cylinder block that is accommodated inside the hermetic container and forms a compression chamber; and a piston inserted into the compression chamber so as to be capable of reciprocating. When the operating frequency is 16-35 r/s, the average speed at which the piston reciprocates is set to exceed 0.31 m/s.
F04B 39/00 - Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups
2.
VIBRATION CONTROL DEVICE AND HERMETIC COMPRESSOR USING SAME
A vibration control device (18) according to the present invention comprises: a sheet-shaped elastic member (17) that has elasticity and can deform so as to be in contact with a structure surface in which vibration occurs; and a retention member (16) that retains the elastic member (17) and causes the same to be in close contact with the structure surface. The retention member (16) is partially fixed, at a prescribed distance from the structure surface. While retained between the retention member (16) and the structure surface, the elastic member (17) is in contact with the structure surface, without being fixed thereto. The vibration control device (18) is applied, for example, to a hermetic compressor. A hermetic container (1a) of the hermetic compressor is the structure, and the vibration control device (18) is provided to an inner surface of the hermetic container (1a).
F16F 15/04 - Suppression of vibrations of non-rotating, e.g. reciprocating, systemsSuppression of vibrations of rotating systems by use of members not moving with the rotating system using elastic means
F16F 15/06 - Suppression of vibrations of non-rotating, e.g. reciprocating, systemsSuppression of vibrations of rotating systems by use of members not moving with the rotating system using elastic means with metal springs
F04B 39/00 - Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups
Suction arrangements in hermetic compressors are disclosed. A hermetic compressor comprises: a hermetic shell having a hermetically sealed interior; a suction tube passing through the hermetic shell and having a suction tube outlet within the hermetically sealed interior; a cylinder block arranged within the hermetic shell and defining a compression chamber; a cylinder head forming a closed end of the compression chamber; a suction muffler having a suction muffler inlet opening within the hermetically sealed interior; and a discharge tube passing through the hermetic shell and in communication with the closed end of the compression chamber, the hermetic compressor being configured to draw a refrigerant into the compression chamber from suction tube outlet through the suction muffler, and to compress the refrigerant in the compression chamber such that compressed refrigerant passes through the closed end of the compression chamber and into the discharge tube, wherein the suction tube outlet is arranged to direct refrigerant flowing from the suction tube towards a surface of the cylinder head such that refrigerant flows over the surface of the cylinder head before entering the suction muffler inlet.
F04B 35/04 - Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for the means being electric
This insulator (10) is provided with an annular outer periphery part (11), and a winding part (50) which extends in a first direction from the outer periphery part (11) towards the center of the outer periphery part and around which a wire (42) is wound, wherein the winding part (50) comprises an introduction part (52) where the wire (42) is introduced from the outer periphery part (11), a wind-around part (51) around which the wire (42) introduced from the introduction part (52) is wound, and a separation wall (60) which is disposed between the introduction part (52) and the circumferential part (51) in the first direction, and which separates the portion of the wire (42) introduced in the introduction part (52) and the first winding portion, which is wound around the wind-around part (51).
H02K 3/34 - Windings characterised by the shape, form or construction of the insulation between conductors or between conductor and core, e.g. slot insulation
H02K 3/46 - Fastening of windings on the stator or rotor structure
5.
INSULATOR, ELECTRIC MOTOR, AND APPLIED EQUIPMENT PROVIDED WITH ELECTRIC MOTOR
This insulator is provided with a holder portion for holding a stator winding of an electric motor, and at least one locking portion which includes a locking groove into which the winding is inserted, and which sandwiches and locks the winding from both sides in the groove width direction of the locking groove. A plurality of straight parts having a fixed groove width in the direction in which the winding is inserted, and a plurality of tapered parts, in which the groove width is tapered toward the front in said insertion direction, are formed in the locking groove. The straight parts and the tapered parts are arranged alternately in such a way that the groove width of the locking groove is tapered toward the front in the insertion direction.
A refrigerant compressor includes: a sealed container in which refrigerating machine oil is stored; an electric element accommodated in the sealed container and driven by electric power supplied from outside; and a compression element accommodated in the sealed container and covered with the refrigerating machine oil, the compression element being driven by the electric element to compress refrigerant gas supplied from outside. The refrigerating machine oil contains an oil film shortage adjusting agent in a dissolved state in such a concentration that deposition of the oil film shortage adjusting agent does not occur at least while the refrigerant compressor is operating.
C10M 107/24 - Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing monomers having an unsaturated radical bound to an alcohol, aldehydo, ketonic, ether, ketal or acetal radical
In this sealed refrigerant compressor, a thrust bearing (for example, a thrust ball bearing (210)) is provided on a thrust surface (136) of a main bearing (134). In the sliding surface of the main bearing (134), an end section on a compressive chamber (133) side serves as a first end, and an end section on the side opposite to the compressive chamber serves as a second end. Furthermore, L is the distance between the axial center of the compressive chamber (133) and the second end (sliding surface lower end (139)) of the sliding surface of the main bearing (134), and La is the distance between the axial center of the compressive chamber (133) and the first end (sliding surface upper end (138)) of the sliding surface of the main bearing (134). In this case, when the distance L is within the range of 38-51 mm, the distance La is no greater than 16 mm.
F04B 39/00 - Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups
According to the present invention, a lubricating oil has a kinematic viscosity at 40°C ranging from 1 mm2/S to 7 mm2/S and an average mass molecular weight ranging from 150 to 400, the lubricating oil containing 0.5 mass% or more of a high-molecular-weight component, and the high-molecular-weight component having a mass molecular weight of 500 or more. In a crankshaft, which is a shaft part of a compression element, the ratio L/D of a single sliding length L and the outside diameter D of a main shaft is 2.0 or less, where the single sliding length L is the axial length of a sliding surface of the main shaft when the sliding surface is a single surface, or the single sliding length L is the axial length of the sliding surface having the shortest axial length when the sliding surface is divided into a plurality of surfaces.
F04B 39/00 - Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups
C10N 30/00 - Specified physical or chemical property which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
A suction muffler for a reciprocating compressor comprises a first housing portion and a second hosing portion. The first housing portion comprising a first inlet opening, and a second inlet opening. The second housing portion comprises a blocking member configured to block one of a first refrigerant flow path from the first inlet opening to a suction muffler outlet and a second refrigerant flow path from the second inlet opening to the suction muffler outlet. The blocking member can be provided in different configurations by a selection of the second housing portion or by configuring the relative arrangement of the first housing portion and the second housing portion.
F04B 39/00 - Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups
10.
CRANKSHAFT FOR HERMETIC COMPRESSOR AND HERMETIC COMPRESSOR
A crankshaft for a hermetic compressor comprises: a main shaft portion; a flange portion coupled on an end of the main shaft portion; an eccentric shaft portion coupled to the flange portion, the eccentric shaft portion having a main axis parallel to and offset from the rotational axis of the main shaft portion; an arm portion extending from an end of the eccentric shaft portion distal to the flange portion, the arm portion having a part coupled to the end of eccentric shaft portion distal to the flange portion, an angled part angled away from the flange portion and a counterweight supporting part which is parallel to the part coupled to the end of the eccentric shaft; and a counterweight coupled to the counterweight supporting part of the arm portion.
F04B 39/00 - Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups
A refrigerant compressor comprises: a sealed container in which refrigeration oil is stored; an electric component that is housed in the sealed container and driven by electricity supplied externally; and a compression component that is housed in the sealed container, is deposited in the refrigeration oil, is driven by the electric component, and compresses refrigerant gas supplied externally. The refrigeration oil contains, in a dissolved state, an oil film shortage regulating agent for which the concentration is regulated so as not to precipitate out at least during operation.
C10M 107/24 - Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing monomers having an unsaturated radical bound to an alcohol, aldehydo, ketonic, ether, ketal or acetal radical
F04B 39/00 - Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups
F25B 1/00 - Compression machines, plants or systems with non-reversible cycle
C10N 30/00 - Specified physical or chemical property which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
This refrigerant compressor has a sealed container in which refrigerator oil is stored, wherein either a shaft part that is a main shaft and an eccentric shaft, or a bearing part that is a main bearing and an eccentric bearing, is provided with a tapered part that brings the shaft part and the bearing part into line contact in a state in which the axis of the shaft part is inclined relative to the axis of the bearing part, due to the diameter changing from the longitudinally outward side of a crankshaft toward the center in one axial end side and another axial end side of the bearing part. The ratio C/D of the diameter D of the shaft part to the clearance C between the shaft part and the bearing part is set to a value in the range of 4.0×10−4to 3.0×10−3BB of the tapered part is set to a value of 2.0×10−3BB in the corresponding combination of the shaft part and the bearing part, is set to a value of 4.0×10−3 or less.
F04B 39/00 - Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups
A sealed compressor (100) is provided with: a compression element (106) for compressing a refrigerant gas; an electric element (104) having a stator (119) which has a core (117) on which a winding wire (118) is wound, and also having a rotor (120) surrounding the stator, the electric element (104) driving the compression element; and a sealed container (102) for housing the compression element and the electric element. The compression element has: a crankshaft (134) having a primary shaft section (144) and an eccentric shaft section (145) which is provided eccentric to the primary shaft section; a block (121) having a primary bearing (136) which supports a first portion (141) of the primary shaft section, and also having a cylinder (122); a piston (124) connected to the eccentric shaft section through a connecting rod (150) and provided so as to be capable of reciprocating inside the cylinder; and a secondary bearing (146) to which the core is affixed and which supports a second portion of the main shaft section, which is provided on the opposite side of a first portion from the eccentric shaft section. The coefficient of thermal conductivity of the secondary bearing is higher than that of the core.
F04B 39/00 - Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups
14.
COMPRESSOR, REFRIGERATION/COLD STORAGE DEVICE USING SAME, AND METHOD FOR MANUFACTURING COMPRESSOR
A first member (210) and a second member (220) provided to a compressor are configured from iron or an iron-based material that is an iron alloy. The iron-based material constituting the first member (210) contains a greater amount of carbon than the iron-based material constituting the second member (220). The second member (220) is secured to the first member (210). The second member (220) has in the secured surface thereof a protrusion (211) that is formed by laser machining and that protrudes relative to the surface of the first member (210) on which the securing is done. The first member (210) has, on the surface on which the securing is done, a recess (211) that firmly adheres to and fits with the protrusion (211).
F04B 39/00 - Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups
This hermetic refrigerant compressor stores a lubricating oil 103 having a kinematic viscosity of 1-10 mm2/S at 40°C, and accommodates a motor element 106 and a compressing element 107 driven by said motor element 106 and compressing a refrigerant, in a hermetic container 101. The surface tension of the lubricating oil 103 is in the range of 23-45 mN/m.
C10M 171/02 - Specified values of viscosity or viscosity index
C10M 171/00 - Lubricating compositions characterised by purely physical criteria, e.g. containing as base-material, thickener or additive, ingredients which are characterised exclusively by their numerically specified physical properties, i.e. containing ingredients which are physically well defined but for which the chemical nature is either unspecified or only very vaguely indicated
C10N 20/00 - Specified physical properties of component of lubricating compositions
A hermetic refrigerant compressor (100) stores, in a hermetic container (101), a lubricating oil (103) that has a kinematic viscosity at 40°C of 1-9 mm2/S and includes sulfur or a sulfur-containing compound as a slidability modifier. A compression element (107) includes a crankshaft (108) as a shaft. Where the sliding surface of a main shaft (109) is a single surface and the axial length of the sliding surface is taken as a single sliding length L, or where the sliding surface is divided into a plurality of surfaces and the minimum axial length of the sliding surface is taken as the single sliding length L, the ratio L/D between the single sliding length L and the outer diameter D of the main shaft (109) is 0.51 or less. Furthermore, where the sum total of axial lengths of the plurality of sliding surfaces is taken as the total sliding length Lt, the ratio Lt/D between the total sliding length Lt and the outer diameter D may be 1.26 or less.
F04B 39/00 - Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups
A suspension spring (10) for a hermetic compressor and a hermetic compressor (50) are provided. The suspension spring (10) includes a series of coils 5 (12). In an unassembled state, at least a portion of a first coil (12a) in the series of coils (12) is at a greater angle of inclination relative to a transverse plane of the suspension spring (10) than successive coils (12b) in the series of coils (12).
F04B 39/00 - Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups
A hermetic compressor is disclosed. The hermetic compressor comprises compressing unit and an electromotive unit. The compressing unit comprises: a cylinder block having a compression chamber; cylinder head having a discharge chamber which is controllably couplable to the compression chamber; a discharge muffler body portion and a discharge muffler cover which form a discharge muffler chamber coupled to the discharge chamber; a piston configured to compress a refrigerant in the compression chamber; and a main frame having a least one mounting leg. The electromotive unit comprises: a stator; a rotor; and a crankshaft coupled to the rotor. The electromotive unit is configured such that rotary motion of the rotor relative to the stator causes rotation of the crankshaft which drives the piston to compress the refrigerant in the compression chamber. The compressing unit is coupled to the stator of the electromotive unit and supported by the at least one mounting leg of the main frame and the discharge muffler cover.
F04B 39/00 - Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups
This compressor is configured by housing, in an airtight container, a compression mechanism unit, and an electric motor unit (2) that drives the compression mechanism unit. The electric motor unit has an outer rotor configuration wherein a rotor (16) is disposed on an outer peripheral section of a stator (15), and a stator lamination board (19) constituting the stator is formed of an amorphous alloy or a nanocrystal material.
H02K 1/02 - Details of the magnetic circuit characterised by the magnetic material
F04B 39/00 - Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups
A hermetic compressor and a stator insulator for are disclosed. The hermetic compressor comprises an electromotive portion which drives a compressing portion. The electromotive portion and the compressing portion are housed within a container. The electromotive portion has a stator which supports the compressing portion. The stator comprises a stator core and a lower insulator. The stator is supported above the base of the container by a plurality of suspension springs. The lower insulator is provided with at least one snubber which engages with one of the suspension springs.
F04B 39/00 - Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups
This compressor driving device 2 is provided with: a compressor driving circuit 9 that drives a compressor; a compressor-driving power supply circuit 8 that supplies power to the compressor driving circuit from an alternating current power source 1; a control circuit 11 that controls the compressor driving circuit; a controlling power supply circuit 10 that supplies power to the control circuit from the alternating current power source; and an electromagnetic switch 7 which, when over-voltage is generated in the alternating current power source, does not disconnect an electrical connection between the alternating current power source and the controlling power supply circuit, but disconnects an electrical connection between the alternating current power source and the compressor-driving power supply circuit.
H02H 7/122 - Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for convertersEmergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for rectifiers for static converters or rectifiers for inverters, i.e. DC/AC converters
The hermetic refrigerant compressor (10A) houses an electromotive component (20A) and a compressive component (30) within a hermetic container (11). A crankshaft (40) provided on the compressive component (30) includes a main shaft portion (41) and an eccentric shaft portion (42), wherein the main shaft portion (41) is affixed to a rotor (22A) constituting the electromotive component (20A). Furthermore, the rotor (22A) is provided with at least a balance adjustment means, for example, a balance hole (27), for adjusting load imbalance originating in the structure of the main shaft portion (41).
F04B 39/00 - Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups
F25B 1/02 - Compression machines, plants or systems with non-reversible cycle with compressor of reciprocating-piston type
23.
HERMETICALLY SEALED REFRIGERANT COMPRESSOR AND REFRIGERATION DEVICE USING SAME
This hermetically sealed refrigerant compressor (100) comprises a compression element (107) that is housed inside a hermetically sealed container (101) and compresses a refrigerant; and an electric element (106) that drives the compression element (107). A lubricating oil (103) is stored inside the hermetically sealed container (101). The lubricating oil (103) is a mixed oil made of at least a mineral oil and a synthetic oil. The lubricating oil (103) has a kinematic viscosity at 40°C within a range from 0.1 mm2/s to 5.1 mm2/s and a flash point of 110°C or higher.
F04B 39/00 - Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups
C10N 30/00 - Specified physical or chemical property which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
This hermetically sealed refrigerant compressor (100) comprises a compression element (107) that is housed inside a hermetically sealed container (101) and compresses a refrigerant; and an electric element (106) that drives the compression element (107). A lubricating oil (103) is stored inside the hermetically sealed container (101), and a resin member is included among members housed inside the hermetically sealed container (101). The resin member is a member wherein the amount of oligomers included in the resin member is less than or equal to 2.5 wt% of the entire weight of the resin member. The lubricating oil 103 has a kinematic viscosity at 40°C within a range from 0.1 mm2/s to 5.1 mm2/s and a flash point of 110°C or higher.
F04B 39/00 - Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups
Inside a sealed container (101) of a refrigerant compressor (100), lubricating oil (103) having a kinematic viscosity at 40°C of 0.1 mm2/S to 5.1 mm2/S is stored, and an electric element (106) and a compression element (107) are accommodated. The compression element (107) is provided with, as a shaft part, a crankshaft (108) comprising a main shaft (109) and an eccentric shaft (110), and as bearing parts, a main bearing (114) that axially supports the main shaft (109) and an eccentric bearing (119) that axially supports the eccentric shaft (110). At least one surface of the main shaft (109) and the eccentric shaft (110) is subjected to a surface treatment, e.g., formation of an oxide film, having a hardness equal to or greater than that of a bearing part (the main bearing (114) or the eccentric bearing (119)). Satisfactory reliability in sliding parts can thereby be achieved even if lubricating oil having lower viscosity is used.
F04B 39/00 - Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups
26.
SEALED TYPE ELECTRIC COMPRESSOR AND REFRIGERATION DEVICE USING SAME
A sealed type electric compressor according to the disclosure includes: a bearing (132) that pivotably supports a shaft (133) of a compressing element (106); a core part (150) of a stator (142), the core part (150) being fastened in the vicinity of the bearing (132) with a bolt (166); a rotor (140) that rotates around the outer periphery of the stator (142); and an inclusion, such as a ring-shaped plate (169), sandwiched between a bolt mounting surface (158) of the core part (150) and a head (168) of the bolt (166). As a result, when the bolt (166) is fastened, the load of locally compressing the bolt mounting surface (158) of the core part (150) by the head (168) of the bolt (166) can be distributed by the inclusion.
F04B 39/00 - Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups
H02K 1/18 - Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures
H02K 7/14 - Structural association with mechanical loads, e.g. with hand-held machine tools or fans
27.
HERMETIC COMPRESSOR AND REFRIGERATION DEVICE USING SAME
This hermetic compressor has, on the outer peripheral surface of a piston (136): a cylindrical sealing portion (137) that forms a sliding surface; an outer peripheral surface portion (140) that is positioned rearward of the sealing portion (137), has the same radius as that of the sealing portion (137), and supports the lateral pressure applied to the piston (136); and a lower stepped surface (139) that is formed so as to have a smaller radius than that of the outer peripheral surface portion (140). Multiple recessed portions (142) are formed as a group on the outer peripheral surface portion (140). The sliding area is thus reduced by the recessed portions (142) provided on the outer peripheral surface portion (140) but not provided on the sealing portion (137). Accordingly, the sliding loss can be reduced, the efficiency of the hermetic compressor is increased, and the refrigerating capacity of the refrigeration device can be improved.
F04B 39/00 - Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups
28.
HERMETIC ELECTRIC COMPRESSOR AND REFRIGERATION DEVICE USING SAME
Provided is a hermetic electric compressor wherein the generation of noise is suppressed while reducing sliding loss by using a thrust ball bearing; also provided is a refrigeration device using this compressor. The hermetic electric compressor is configured so as to be equipped with a compression element 3 and an electric motor element 2, the electric motor element is an outer-rotor-type motor wherein a rotor 18 rotates around the outer circumference of a stator 19, the thrust load of a crankshaft 15 which is rotated by the rotor and drives the compression element is supported by a rolling bearing comprising a thrust ball bearing 16, and a preload generation mechanism 26 for applying downward pressure to the thrust ball bearing is provided. Thus, sliding loss of the crankshaft can be reduced by the rolling bearing comprising a thrust ball bearing, and a preload is applied constantly to the thrust ball bearing by means of the preload generation mechanism, thereby suppressing slipping of the balls, and preventing raceway friction and ball vibration.
F04B 39/00 - Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups
F16C 19/10 - Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for axial load mainly
H02K 5/173 - Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using bearings with rolling contact, e.g. ball bearings
H02K 7/14 - Structural association with mechanical loads, e.g. with hand-held machine tools or fans
29.
ELECTRIC MOTOR, HERMETICALLY SEALED ELECTRIC COMPRESSOR USING SAME, AND REFRIGERATION DEVICE
[Problem] To provide: an electric motor in which permanent magnets can be fixed without being displaced, while ensuring high productivity; a hermetically sealed electric compressor which uses same; and a refrigeration device. [Solution] Positioning portions 27 in which permanent magnets 22 are fitted are provided to the inner circumferential surface of a back yoke 21 of a rotor 18, and the permanent magnets 22 are fitted in the positioning portions 27 and positioned. Accordingly, the positions of the permanent magnets are regulated by the positioning portions of the inner circumferential surface of the back yoke, and the permanent magnets can be fixed in the proper positions without being displaced. Furthermore, productivity is improved as a result of not requiring magnet fixing positions to be measured, nor the use of a jig to perform positioning. Moreover, loss of the dynamic balance of the rotor caused by displacement of the permanent magnets can be prevented, and increase in rotational vibration can be inhibited and reduced.
F04B 39/00 - Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups
F25B 1/02 - Compression machines, plants or systems with non-reversible cycle with compressor of reciprocating-piston type
The present invention describes suction hoods (120, 120a, 120b) for external mounting at an inlet port (112, 112a) of a suction muffler (100, 100a, 1000b, 100c) for a refrigeration system. The suction hoods (120, 120a, etc) are securely located at the inlet port by a clamping member (154, 116a, 118) and a locking mechanism disposed across the inlet port from the clamping member. In an embodiment, the clamping member (154, 116a) goes through an upper hoop (124) on the suction hood (120, etc) and may contact or cooperate with an extension member (116, 154c). The locking mechanism includes a peg-and-hoop (114,126) or pin-and-hole (162-128, 166-129) configuration.
F04B 39/14 - Provisions for readily assembling or disassembling
F04B 39/00 - Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups
F04B 53/00 - Component parts, details or accessories not provided for in, or of interest apart from, groups or
The present invention provides a refrigerant compressor which may assure excellent reliability while using low-viscosity refrigerant. The refrigerant compressor is characterized in that the viscosity of oil stored in hermetic container ranges from VG3 to VG8, and the boiling component at 350° C. or over is not less than 10% and not higher than 30% in volume ratio, and the boiling component at 300° C. or less is not less than 50% and not higher than 70% in volume ratio. Accordingly, the input reduction at sliding surfaces can be realized, and the lubricant is evaporated, therefore it is possible to prevent defective compression caused by PET (polyethylene phthalate) or the like deposited on the surfaces of the discharge reed and the like, and to enhance the efficiency and reliability.
F04B 39/00 - Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups
A compressor includes a motor driven by a controller and having a rotor and a stator, a compressing unit driven by the motor in a hermetic container in which refrigerant is filled. Driving the motor at a low rpm, the controller practices a feedback control which determines a timing of turning on/off switching elements based on a signal detecting a position of the rotor, and when the motor is driven at a high rpm, the controller practices an open-loop control which outputs a given frequency and drives the motor synchronizing with the given frequency. This structure achieves a compressor working with a fewer noises in PWM driving.
patents
