WO2025004544A1 - 圧縮機及び冷凍装置 - Google Patents
圧縮機及び冷凍装置 Download PDFInfo
- Publication number
- WO2025004544A1 WO2025004544A1 PCT/JP2024/017125 JP2024017125W WO2025004544A1 WO 2025004544 A1 WO2025004544 A1 WO 2025004544A1 JP 2024017125 W JP2024017125 W JP 2024017125W WO 2025004544 A1 WO2025004544 A1 WO 2025004544A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- casing
- terminal
- wall
- terminal body
- compressor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
Links
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
- F04C18/02—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents
- F04C18/0207—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents both members having co-operating elements in spiral form
- F04C18/0215—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents both members having co-operating elements in spiral form where only one member is moving
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B35/00—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
- F04B35/04—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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—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 F04B25/00 - F04B37/00
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—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 F04B25/00 - F04B37/00
- F04B39/12—Casings; Cylinders; Cylinder heads; Fluid connections
- F04B39/121—Casings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—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 F04B25/00 - F04B37/00
- F04B39/14—Provisions for readily assembling or disassembling
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
- F04C18/02—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents
- F04C18/0207—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents both members having co-operating elements in spiral form
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
- F04C18/30—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
- F04C18/34—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F04C18/08 or F04C18/22 and relative reciprocation between the co-operating members
- F04C18/356—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F04C18/08 or F04C18/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the outer member
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C23/00—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids
- F04C23/008—Hermetic pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
- F04C28/28—Safety arrangements; Monitoring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2240/00—Components
- F04C2240/30—Casings or housings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2240/00—Components
- F04C2240/40—Electric motor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2240/00—Components
- F04C2240/80—Other components
- F04C2240/803—Electric connectors or cables; Fittings therefor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2240/00—Components
- F04C2240/80—Other components
- F04C2240/805—Fastening means, e.g. bolts
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2240/00—Components
- F04C2240/80—Other components
- F04C2240/806—Pipes for fluids; Fittings therefor
Definitions
- This disclosure relates to compressors and refrigeration devices.
- a terminal box for protecting the terminals is provided on the peripheral wall of the casing.
- This type of compressor comprises a compression mechanism, a casing, a terminal rod, a terminal body, and a terminal box.
- the casing houses the compression mechanism.
- the terminal rod is connected to wiring that leads to equipment inside the casing.
- the terminal body holds the terminal rod and is fixed to the outer wall of the casing.
- the terminal box is fixed to the outer wall of the casing and houses the terminal rod held by the terminal body.
- the purpose of this disclosure is to prevent flames that occur inside a terminal box in a compressor from escaping outside the terminal box.
- the first aspect of the present disclosure is directed to a compressor (10).
- the compressor (10) includes a compression mechanism (30), a casing (20) that houses the compression mechanism (30), a terminal body (110) that holds a terminal rod (100) to which wiring (K) is connected to equipment (J) in the casing (20) and is fixed to an outer wall (28) of the casing (20), and a terminal box (120) that houses the terminal rod (100) that is fixed to the outer wall (28) of the casing (20) and is held by the terminal body (110).
- the terminal box (120) includes a bottom wall portion (121) fixed to the outer wall (28) of the casing (20), a hole portion (122) formed in the bottom wall portion (121) and through which the terminal body (110) passes, and a tubular portion (126) extending from the periphery (122a) of the hole portion (122) toward the direction (E) away from the casing (20), and the terminal body (110) is inserted into the tubular portion (126).
- a flame generated in the terminal box (120) passes through the gap between the terminal body (110) and the cylindrical portion (126) of the terminal box (120) in order to escape from the terminal box (120).
- the flame may be extinguished before passing through the gap.
- the compressor (10) according to the first aspect can prevent a flame generated inside the terminal box (120) from escaping outside the terminal box (120).
- the second aspect of the present disclosure is directed to the compressor (10) according to the first aspect.
- the insertion length (L1) of the terminal body (110) inserted into the cylindrical portion (126) is 6 mm or more.
- the compressor (10) according to the second embodiment is more advantageous in extinguishing the flame before it passes through the gap between the terminal body (110) and the cylindrical portion (126) of the terminal box (120).
- the third aspect of the present disclosure is directed to the compressor (10) according to the first or second aspect.
- the gap (T) between the terminal body (110) and the cylindrical portion (126) is 0.4 mm or less.
- the compressor (10) according to the third aspect is more advantageous in extinguishing the flame before it passes through the gap (T) between the terminal body (110) and the cylindrical portion (126) of the terminal box (120).
- the fourth aspect of the present disclosure is directed to the compressor (10) according to any one of the first to third aspects.
- the tubular portion (126) is cylindrical and extends straight, and the terminal body (110) extends straight and has a circular cross section.
- the compressor (10) according to the fourth aspect makes it easy to insert the terminal body (110) into the cylindrical portion (126) of the terminal box (120).
- the fifth aspect of the present disclosure is directed to the compressor (10) according to any one of the first to fourth aspects.
- the compressor (10) includes an electric motor (70) that drives the compression mechanism (30), the casing (20) houses the compression mechanism (30) and the electric motor (70), and the terminal rod (100) is connected to a wiring (K) that leads to the electric motor (70).
- a large current is likely to flow through the terminal rod (100) connected to the electric motor (70) via the wiring (K), so it is beneficial to take measures against flames that may occur around the terminal rod (100) through which a large current is likely to flow.
- the sixth aspect of the present disclosure is directed to the compressor (10) according to any one of the first to fifth aspects.
- the outer wall (28) is arc-shaped.
- a gap is easily formed between the outer wall (28) of the casing (20) and the bottom wall portion (121) of the terminal box (120). This makes it possible to further enjoy the benefits of inserting the terminal body (110) into the cylindrical portion (126) of the terminal box (120).
- the seventh aspect of the present disclosure is directed to a refrigeration system (1).
- the refrigeration system (1) includes a compressor (10) according to any one of the first to sixth aspects.
- FIG. 1 shows a refrigeration system (1) according to a first embodiment.
- FIG. 2 is a front cross-sectional view of the compressor (10) according to the first embodiment.
- FIG. 3 shows a front cross-sectional view of the outer wall (28) of the casing (20), the terminal rod (100), the terminal body (110), and the terminal box (120) according to the first embodiment.
- FIG. 4 is a perspective view of a terminal rod (100) and a terminal body (110) according to the first embodiment.
- FIG. 5 is a plan view showing the outer wall (28) of the casing (20) and the terminal box (120) according to the first embodiment.
- FIG. 6 is a side view showing the terminal rod (100), the terminal body (110), and the terminal box (120) according to the first embodiment.
- FIG. 7 is a view corresponding to FIG. 3 according to the second embodiment.
- FIG. 8 is a view corresponding to FIG. 3 according to the third embodiment.
- FIG. 9 is a view corresponding to FIG. 3 according to the
- FIG. 1 shows the refrigeration system (1).
- the refrigeration system (1) includes a refrigerant circuit (1a) in which a refrigerant circulates as a working fluid.
- the refrigerant circuit (1a) of the refrigeration system (1) includes a compressor (10), a condenser (heat radiator) (2), a pressure reduction mechanism (expansion mechanism) (3), and an evaporator (4).
- the pressure reduction mechanism (3) is, for example, an expansion valve or a capillary tube.
- the refrigerant circuit (1a) performs a vapor compression refrigeration cycle.
- the refrigeration system (1) is applied to, for example, an air conditioner or a chiller.
- the compressor (Compressor) 2 shows a front cross-sectional view of the compressor (10).
- the compressor (10) is a scroll compressor.
- the compressor (10) includes a casing (20), a compression mechanism (30), a drive shaft (40), a housing (50), a balance weight (60), an electric motor (70), a lower bearing member (80), an oil pump (90), a terminal rod (100), a terminal body (110), and a terminal box (120).
- the direction in which the axis of the drive shaft (40) extends is referred to as the axial direction and is indicated by (Z).
- the direction perpendicular to the axis of the drive shaft (40) is referred to as the radial direction and is indicated by (R).
- the side farther from the axis of the drive shaft (40) in the radial direction is referred to as the radial outer circumferential side or outward and is indicated by (Ro).
- the side closer to the axis of the drive shaft (40) in the radial direction is referred to as the radial inner circumferential side or inward and is indicated by (Ri).
- the direction of rotation of the drive shaft (40) is referred to as the circumferential direction and is indicated by ( ⁇ ).
- the axial direction of the drive shaft (40) extends in the vertical direction.
- the vertical direction is indicated by (Z), just like the axial direction.
- the upper side in the axial direction (vertical direction) is simply referred to as the upper side and indicated by (Za).
- the lower side in the axial direction (vertical direction) is simply referred to as the lower side and indicated by (Zb).
- the compressor (10) is placed vertically.
- the casing (20) accommodates, from top to bottom, a compression mechanism (30), a housing (50), a balance weight (60), an electric motor (70), a lower bearing member (80), and an oil pump (90).
- the drive shaft (40) extends axially (vertically) within the casing (20).
- terminal body (110) and the terminal box (120) are fixed to the outer wall (28) of the casing (20).
- the terminal rod (100) is held by the terminal body (110).
- the casing (20) accommodates a compression mechanism (30), a drive shaft (40), a housing (50), a balance weight (60), an electric motor (70), a lower bearing member (80), and an oil pump (90).
- the casing (20) is a cylindrical sealed container that extends vertically in the axial direction (vertical direction).
- the casing (20) is made of metal.
- the casing (20) includes a body (21), an upper end plate (22), a lower end plate (23), and legs (24).
- the body (21) is cylindrical with both ends in the axial direction (vertical direction) open.
- the upper end plate (22) closes the upper end of the body (21).
- the lower end plate (23) closes the lower end of the body (21).
- the legs (24) are provided at the bottom of the lower end plate (23) and support the casing (20) on the foundation.
- a suction pipe (25) is connected to the casing (20).
- the suction pipe (25) axially penetrates the upper end plate portion (22) of the casing (20).
- a discharge pipe (26) is connected to the casing (20).
- the discharge pipe (26) radially penetrates the body portion (21) of the casing (20).
- An oil reservoir (27) is provided at the bottom of the casing (20).
- the oil reservoir (27) stores lubricating oil (L).
- the lubricating oil (L) is used to lubricate the sliding parts of the compressor (10).
- the outer wall (28) of the casing (20) will be described later.
- the compression mechanism (30) is provided in the casing (20).
- the compression mechanism (30) compresses a refrigerant (G) (e.g., a refrigerant gas) serving as a working fluid.
- the refrigerant (G) is propane. Propane is highly flammable and easily combustible.
- the compression mechanism (30) includes a fixed scroll (31) and a movable scroll (35). The movable scroll (35) is engaged with the fixed scroll (31).
- the fixed scroll (31) includes a fixed side end plate portion (32), a fixed side wrap (33), and an outer peripheral wall portion (34).
- the fixed side end plate portion (32) is disk-shaped.
- the fixed side wrap (33) is a spiral wall shape that describes an involute curve and protrudes downward from the lower surface of the fixed side end plate portion (32).
- the outer peripheral wall portion (34) is formed so as to surround the fixed side wrap (33) from the outer periphery side, and protrudes downward from the lower surface of the fixed side end plate portion (32).
- the movable scroll (35) is also called an orbiting scroll.
- the movable scroll (35) is disposed below the fixed scroll (31).
- the movable scroll (35) includes a movable end plate portion (36), a movable wrap (37), and a boss portion (38).
- the movable end plate portion (36) is disk-shaped.
- the movable wrap (37) is a spiral wall that describes an involute curve and protrudes upward from the upper surface of the movable end plate portion (36).
- the boss portion (38) is cylindrical and protrudes downward from the center of the lower surface of the movable end plate portion (36).
- a bearing (38a) is fitted into the inner periphery of the boss portion (38).
- the movable side wrap (37) of the movable scroll (35) is meshed with the fixed side wrap (33) of the fixed scroll (31).
- a compression chamber (C) is formed in an area surrounded by the fixed side end plate portion (32) and the fixed side wrap (33) of the fixed scroll (31) and the movable side end plate portion (36) and the movable side wrap (37) of the movable scroll (35).
- the refrigerant (G) is compressed.
- the compression chamber (C) is connected to the suction pipe (25).
- a discharge port (32a) is formed in the fixed end plate portion (32) of the fixed scroll (31).
- the discharge port (32a) axially penetrates the center of the fixed end plate portion (32) and communicates with the compression chamber (C).
- a discharge chamber (A) is formed in the area between the fixed scroll (31) and the upper end plate portion (22) of the casing (20). The discharge chamber (A) communicates with the discharge port (32a).
- the drive shaft (40) extends axially (vertically) within the casing (20).
- the drive shaft (40) has a main shaft portion (41) and an eccentric shaft portion (42).
- the eccentric shaft portion (42) is provided at the upper end of the main shaft portion (41).
- the outer diameter of the eccentric shaft portion (42) is smaller than the outer diameter of the main shaft portion (41).
- the axis (42a) of the eccentric shaft portion (42) is eccentric with respect to the axis (41a) of the main shaft portion (41) by a predetermined distance.
- the eccentric shaft portion (42) of the drive shaft (40) is rotatably supported by the boss portion (38) of the movable scroll (35) via a bearing (38a).
- the housing (50) has a generally cylindrical shape extending in the axial direction (vertical direction).
- the housing (50) is disposed within the casing (20) below the movable scroll (35) and above the balance weight (60).
- the drive shaft (40) is inserted into the inner periphery of the housing (50).
- the outer diameter of the upper portion of the housing (50) is larger than the outer diameter of the lower portion of the housing (50).
- the outer peripheral surface of the upper portion of the housing (50) is fixed to the inner peripheral surface of the body portion (21) of the casing (20).
- the inner diameter of the upper portion of the housing (50) is larger than the inner diameter of the lower portion of the housing (50).
- a crank chamber (51) is formed on the inner periphery of the upper portion of the housing (50) by a downward recess. The crank chamber (51) accommodates the boss portion (38) of the movable scroll (35).
- a main bearing hole (52) is formed on the inner periphery of the lower part of the housing (50).
- the main bearing hole (52) penetrates the lower part of the housing (50) in the axial direction (up and down direction) and communicates with the crank chamber (51).
- a bearing (52a) is fitted into the inner periphery of the main bearing hole (52).
- the main shaft portion (41) of the drive shaft (40) is rotatably supported in the main bearing hole (52) of the housing (50) via the bearing (52a).
- a discharge space (B) is formed below the housing (50) within the casing (20).
- the discharge space (B) is in communication with the discharge pipe (26).
- the balance weight (60) serves to cancel out an unbalanced force generated by the orbital motion of the movable scroll (35) of the compression mechanism (30).
- the balance weight (60) is provided in the casing (20), below the housing (50) and above the electric motor (70).
- the balance weight (60) is provided on the main shaft portion (41) of the drive shaft (40).
- the balance weight (60) rotates integrally with the drive shaft (40).
- the balance weight (60) is composed of a weight portion (61), a non-weight portion (62), and a cover (63).
- the weight portion (61) is a portion that extends over approximately half the circumference of the balance weight (60).
- the weight portion (61) protrudes from the drive shaft (40) toward the outer periphery.
- the weight portion (61) protrudes from the side of the drive shaft (40) opposite to the side where the eccentric shaft portion (42) is eccentric with respect to the main shaft portion (41).
- the cover (63) covers the entire balance weight (60), including the weight portion (61) and the non-weight portion (62).
- the electric motor (70) is also called a motor.
- the electric motor (70) is provided in the casing (20) below the balance weight (60) and above the lower bearing member (80).
- the electric motor (70) is a type of device (J) in the casing (20).
- the electric motor (70) drives the compression mechanism (30) by rotating the drive shaft (40).
- the electric motor (70) includes a rotor (71), a stator (72), a coil (73), and an insulator (74).
- the rotor (71) is also called a rotor.
- the rotor (71) is made of metal.
- the rotor (71) is cylindrical and extends in the axial direction (up and down).
- the rotor (71) is connected to the main shaft portion (41) of the drive shaft (40).
- the main shaft portion (41) of the drive shaft (40) is inserted and fixed to the inner periphery of the rotor (71).
- the rotor (71) rotates integrally with the drive shaft (40).
- the rotor (71) is provided with a plurality of inner refrigerant passages (75).
- the inner refrigerant passages (75) penetrate the wall of the rotor (71) in the axial direction (vertical direction).
- the inner refrigerant passages (75) are arranged side by side at predetermined intervals along the circumferential direction of the rotor (71).
- the stator (72) is also called a stator.
- the stator (72) is made of metal.
- the stator (72) is cylindrical and extends in the axial direction (vertical direction).
- the stator (72) is fixed to the inner peripheral surface of the body (21) of the casing (20).
- the stator (72) is disposed so as to surround the rotor (71) from the outer peripheral side. There is a predetermined gap between the stator (72) and the rotor (71) in the radial direction.
- the rotor (71) is rotatably inserted into the inner peripheral side of the stator (72).
- a plurality of core cuts (72a) are provided on the outer periphery of the stator (72).
- the core cuts (72a) are grooves extending in the axial direction (vertical direction).
- the plurality of core cuts (72a) are arranged at intervals along the circumferential direction of the stator (72).
- An outer refrigerant passage (76) is provided between the core cuts (72a) on the outer periphery of the stator (72) and the inner periphery of the body (21) of the casing (20).
- the coils (73) are fixed to the stator (72). There are multiple (three or more) coils (73) corresponding to the three phases, U-phase, V-phase, and W-phase.
- the coils (73) are arranged at intervals along the circumferential direction of the stator (72).
- Inter-coil refrigerant passages (77) are provided between the coils (73) adjacent to each other in the circumferential direction.
- the coil (73) includes an upper coil end that protrudes above the upper end of the stator (72) and a lower coil end that protrudes below the lower end of the stator (72).
- Lead wires (73a) serving as wiring (K) are drawn from the coils (73) of each phase. There are three lead wires (73a) corresponding to the three phases U, V, and W. The lead wires (73a) are drawn above the motor (70).
- the insulators (74) are made of resin. There are two insulators (74). The insulators (74) are arranged above and below the stator (72). The insulators (74) insulate the stator (72) from the coil (73).
- the lower bearing member (80) has a generally cylindrical shape extending in the axial direction (vertical direction).
- the lower bearing member (80) is provided in the casing (20) between the electric motor (70) and the oil reservoir (27) (the lower bottom portion of the casing (20)).
- the lower bearing member (80) includes a cylindrical portion (81), a protruding portion (82), and an oil separation plate (83).
- the cylindrical portion (81) is cylindrical.
- the cylindrical portion (81) accommodates the main shaft portion (41) of the drive shaft (40).
- a bearing (81a) is fitted into the inner periphery of the cylindrical portion (81).
- the main shaft portion (41) of the drive shaft (40) is rotatably supported by the cylindrical portion (81) of the lower bearing member (80) via the bearing (81a).
- the protrusion (82) protrudes from the cylindrical portion (81) toward the outer periphery and is fixed to the inner periphery of the body portion (21) of the casing (20).
- the oil separation plate (83) is fixed to the cylindrical portion (81) and extends in the radial and circumferential directions.
- the oil separation plate (83) faces the oil reservoir (27).
- the refrigerant (G) contains lubricating oil (L).
- the refrigerant (G) hits the oil separation plate (83) the lubricating oil (L) is separated from the refrigerant (G), and the separated lubricating oil (L) falls into the oil reservoir (27).
- the oil pump (90) includes a pump portion (91) and a nozzle portion (92).
- the pump portion (91) is provided at the lower end of the main shaft portion (41) of the drive shaft (40).
- the pump portion (91) rotates integrally with the drive shaft (40).
- the nozzle portion (92) is fixed to the lower end of the cylindrical portion (81) of the lower bearing member (80).
- the nozzle portion (92) is immersed in the lubricating oil (L) stored in the oil reservoir (27).
- the oil pump (90) draws up the lubricating oil (L) from the oil reservoir (27).
- the lubricating oil (L) is supplied to each sliding part of the compressor (10) through an oil passage (not shown) provided inside the drive shaft (40).
- Low-pressure refrigerant (G) is sucked from the suction pipe (25) into the compression chamber (C) of the compression mechanism (30) in the casing (20) and compressed to become high-pressure refrigerant (G).
- the high-pressure refrigerant (G) is discharged from the compression chamber (C) through the discharge port (32a) of the fixed scroll (31) to the discharge chamber (A).
- the high-pressure refrigerant (G) flows from the discharge chamber (A) through a discharge passage (not shown) formed in the fixed scroll (31) and the housing (50) to the discharge space (B) below the housing (50).
- the high-pressure refrigerant (G) is discharged from the discharge space (B) to the outside of the casing (20) (for example, the condenser (2) of the refrigerant circuit (1a)) through the discharge pipe (26).
- a portion of the refrigerant (G) circulates around the electric motor (70) through the inner refrigerant passage (75), the outer refrigerant passage (76), and the inter-coil refrigerant passage (77).
- FIG. 3 shows a front cross-sectional view of the outer wall (28) of the casing (20), the terminal rod (100), the terminal body (110), and the terminal box (120).
- FIG. 4 shows a perspective view of the terminal rod (100) and the terminal body (110).
- FIG. 5 shows a plan view of the outer wall (28) of the casing (20) and the terminal box (120) as viewed from above in the direction of the V arrow.
- FIG. 6 shows a side view of the terminal rod (100), the terminal body (110), and the terminal box (120) as viewed from the side in the direction of the VI arrow.
- the body (21) of the casing (20) includes an outer wall (28).
- the outer wall (28) separates the inside and outside of the casing (20).
- the outer wall (28) extends in the axial direction (vertical direction) and circumferential direction of the drive shaft (40).
- the inner surface of the outer wall (28) faces the inside of the casing (20).
- the outer surface of the outer wall (28) faces the outside of the casing (20).
- the outer wall (28) is made of metal.
- the outer wall (28) of the casing (20) is arc-shaped when viewed in the axial direction (vertical direction) so as to correspond to the cylindrical shape of the body (21) of the casing (20) (see FIG. 5).
- the outer wall (28) is provided with a seat (28a).
- the seat (28a) is flat.
- a first hole (29) is formed in the seat (28a) of the outer wall (28).
- the first hole (29) is circular.
- the first hole (29) penetrates the outer wall (28).
- the first hole (29) communicates between the inside and the outside of the casing (20).
- the first hole portion (29) is disposed axially (vertically) near the upper end of the electric motor (70) (more specifically, slightly above the upper coil end of the coil (73)).
- Terminal rod As shown in Fig. 3, the terminal rod (100) is rod-shaped. The terminal rod (100) extends straight. The terminal rod (100) is made of metal.
- the terminal rod (100) is disposed in the first hole portion (29) of the outer wall (28).
- the terminal rod (100) passes through the first hole portion (29) of the outer wall (28).
- One end portion (101) of the terminal rod (100) is located inside the casing (20) relative to the outer wall (28).
- the other end portion (102) of the terminal rod (100) is located outside the casing (20) relative to the outer wall (28).
- One end (101) of the terminal rod (100) is connected to a lead wire (73a) as wiring (K) to the electric motor (70) inside the casing (20).
- the other end (102) of the terminal rod (100) is connected to an external power source (not shown) via a power supply cable (not shown).
- Each terminal rod (100) corresponds to the lead wire (73a) of each phase.
- the terminal body (110) has a cylindrical shape with a bottom.
- the terminal body (110) is hollow.
- the terminal body (110) is made of metal.
- the terminal body (110) is press-formed.
- the terminal body (110) is disposed in the first hole portion (29) of the outer wall (28).
- the terminal body (110) includes a first tubular portion (111), a locking portion (112), and a cover portion (113).
- the first tubular portion (111) of the terminal body (110) is cylindrical.
- the first tubular portion (111) of the terminal body (110) extends straight.
- the first tubular portion (111) of the terminal body (110) has a circular cross section when viewed in the extension direction of the first tubular portion (111) (see FIG. 6).
- the first cylindrical portion (111) passes through the first hole portion (29) of the outer wall (28).
- One end of the first cylindrical portion (111) is located inside the casing (20) relative to the outer wall (28).
- the other end of the first cylindrical portion (111) is located outside the casing (20) relative to the outer wall (28).
- the outer diameter of the first cylindrical portion (111) is slightly smaller than the inner diameter of the first hole portion (29) of the outer wall (28).
- the locking portion (112) is provided at one end of the first cylindrical portion (111).
- the locking portion (112) is located inside the outer wall (28) of the casing (20).
- the locking portion (112) is formed by widening the diameter of one end of the first cylindrical portion (111).
- the outer diameter of the locking portion (112) is larger than the outer diameter of the first cylindrical portion (111).
- the outer diameter of the locking portion (112) is larger than the inner diameter of the first hole portion (29) of the outer wall (28).
- the lid portion (113) closes the opening on the other end side of the first cylindrical portion (111).
- the lid portion (113) is located outside the casing (20) relative to the outer wall (28).
- the terminal body (110) is fixed to the outer wall (28) of the casing (20).
- the first cylindrical portion (111) of the terminal body (110) penetrates the first hole portion (29) of the outer wall (28).
- the first cylindrical portion (111) is fitted into the first hole portion (29).
- the locking portion (112) of the terminal body (110) contacts and hooks onto the periphery of the first hole portion (29) on the inner surface of the outer wall (28).
- the first cylindrical portion (111) of the terminal body (110) protrudes in a separation direction (E) away from the outer wall (28) of the casing (20).
- the first cylindrical portion (111) of the terminal body (110) extends straight in the separation direction (E).
- the separation direction (E) coincides with the radial outer periphery of the drive shaft (40).
- the separation direction (E) is also the other end side in the extension direction of the first cylindrical portion (111) of the terminal body (110).
- the separation direction (E) is also the other end side in the extension direction of the terminal rod (100).
- the terminal body (110) holds the terminal rod (100).
- the terminal rod (100) is housed in a first cylindrical portion (111) of the terminal body (110).
- the terminal rod (100) passes through a hole (not shown) in the lid portion (113) of the terminal body (110) in the separation direction (E).
- the other end (102) of the terminal rod (100) is located on the separation direction (E) side of the lid portion (113) of the terminal body (110).
- the terminal rod (100) and the terminal body (110) are electrically insulated from each other by the insulating material (130).
- the insulating material (130) is made of glass.
- the insulating material (130) is interposed between the terminal rod (100) and the cover portion (113) of the terminal body (110).
- the terminal box (120) has a box shape.
- the terminal box (120) has a rectangular parallelepiped shape.
- the terminal box (120) is made of metal.
- the terminal box (120) is located outside the outer wall (28) of the casing (20).
- the terminal box (120) is fixed to the outer wall (28) of the casing (20).
- the terminal box (120) protects the terminal rod (100) housed in the housing space (120a) described below.
- the terminal box (120) is also used during maintenance.
- the terminal box (120) includes a bottom wall portion (121), a second hole portion (122), a side wall portion (123), a cover portion (124), a cable gland (125), and a second tube portion (126).
- the bottom wall portion (121) extends in the axial direction (vertical direction) and circumferential direction of the drive shaft (40) so as to correspond to the outer wall (28) of the casing (20).
- the bottom wall portion (121) has an arc shape when viewed in the axial direction (vertical direction) so as to correspond to the arc shape of the outer wall (28) of the casing (20) (the cylindrical shape of the body portion (21) of the casing (20)).
- the bottom wall portion (121) is a rectangular plate bent into an arc shape.
- the bottom wall portion (121) is provided with a seat portion (121a).
- the seat portion (121a) is flat.
- the seat portion (121a) of the bottom wall portion (121) corresponds to the seat portion (28a) of the outer wall (28).
- the bottom wall portion (121) (specifically, the seat portion (121a) of the bottom wall portion (121)) has a plate thickness (t).
- the bottom wall portion (121) is fixed to the outer wall (28) of the casing (20). As shown in FIG. 5, since both the outer wall (28) and the bottom wall portion (121) are arc-shaped, a gap (H) is likely to form between the outer wall (28) and the bottom wall portion (121).
- the second hole (122) is formed in the seat (121a) of the bottom wall (121).
- the second hole (122) is circular.
- the second hole (122) penetrates the bottom wall (121).
- the second hole (122) of the bottom wall (121) overlaps with the first hole (29) of the outer wall (28).
- the first cylindrical portion (111) of the terminal body (110) passes through the second hole portion (122) provided in the bottom wall portion (121) of the terminal box (120).
- the first cylindrical portion (111) of the terminal body (110) protrudes in the separation direction (E) from the bottom wall portion (121) of the terminal box (120) by an amount at least greater than the plate thickness (t) of the bottom wall portion (121).
- the cover portion (113) of the terminal body (110) is located on the separation direction (E) side from the bottom wall portion (121) of the terminal box (120).
- the terminal rod (100) held by the terminal body (110) is located on the separation direction (E) side from the bottom wall portion (121) of the terminal box (120).
- the side wall portion (123) extends (rises) in the separation direction (E) from the periphery of the rectangular plate-shaped bottom wall portion (121).
- the side wall portion (123) is rectangular tubular.
- the bottom wall portion (121) closes the open end of the rectangular tubular side wall portion (123) on the side opposite the separation direction (E) (the side closer to the outer wall (28) of the casing (20)).
- the lid portion (124) is in the form of a rectangular plate.
- the lid portion (124) closes the open end of the rectangular cylindrical side wall portion (123) on the separation direction (E) side.
- a seal member (124a) is interposed between the side wall portion (123) and the lid portion (124).
- an accommodation space (120a) is formed in an area (inside the terminal box (120)) surrounded by the bottom wall portion (121), the side wall portion (123), and the lid portion (124).
- the bottom wall portion (121), the side wall portion (123), and the lid portion (124) separate the accommodation space (120a) inside the terminal box (120) from the external space (120b) outside the terminal box (120).
- the storage space (120a) in the terminal box (120) has an internal volume (V).
- the terminal box (120) accommodates the terminal rod (100) held by the terminal body (110) in the accommodation space (120a).
- the portion of the terminal rod (100) that protrudes in the separation direction (E) beyond the cover portion (113) of the terminal body (110) is accommodated in the accommodation space (120a) in the terminal box (120).
- the cable gland (125) is generally cylindrical.
- the cable gland (125) passes through a hole (not shown) in the side wall portion (123).
- a seal member (not shown) is interposed between the hole in the side wall portion (123) and the cable gland (125).
- the power supply cable (not shown) connected to the other end (102) of the terminal rod (100) housed in the housing space (120a) in the terminal box (120) passes through the cable gland (125) and is connected to an external power source (not shown) located in the external space (120b) outside the terminal box (120).
- the second tubular portion (126) extends from the periphery (122a) of the second hole portion (122) provided in the bottom wall portion (121) toward the separation direction (E) away from the outer wall (28) of the casing (20).
- the second tubular portion (126) is cylindrical.
- the second tubular portion (126) extends straight in the separation direction (E).
- the second tubular portion (126) extends in the separation direction (E) by a total length (L0).
- the second tubular portion (126) is disposed in the storage space (120a) in the terminal box (120).
- the first cylindrical portion (111) of the terminal body (110) is inserted into the second cylindrical portion (126) of the terminal box (120).
- the first cylindrical portion (111) of the terminal body (110) is fitted into the second cylindrical portion (126) of the terminal box (120).
- the first cylindrical portion (111) of the terminal body (110) and the second cylindrical portion (126) of the terminal box (120) are fitted together.
- the first cylindrical portion (111) of the terminal body (110) and the second cylindrical portion (126) of the terminal box (120) are in a clearance fit relationship.
- the tip end portion (connection portion with the cover portion (113)) of the first cylindrical portion (111) of the terminal body (110) on the separation direction (E) side protrudes slightly toward the separation direction (E) side relative to the tip end portion of the second cylindrical portion (126) of the terminal box (120) on the separation direction (E) side.
- a gap (T) is formed between the outer peripheral surface of the first cylindrical portion (111) of the terminal body (110) and the inner peripheral surface of the second cylindrical portion (126) of the terminal box (120).
- the gap (T) between the outer peripheral surface of the first cylindrical portion (111) of the terminal body (110) and the inner peripheral surface of the second cylindrical portion (126) of the terminal box (120) is set to a predetermined value or less based on the design criteria for safety gaps shown in Table 1 below.
- the gap (T) is the sum of the first gap (T1) at any point between the first cylindrical portion (111) and the second cylindrical portion (126) and the second gap (T2) at the opposite side by 180° from the first gap (T1) (a position that is rotationally symmetrical with respect to the center of each cylindrical portion).
- the insertion length (L1) of the first tubular portion (111) of the terminal body (110) inserted into the second tubular portion (126) of the terminal box (120) is set to a predetermined value or more based on the design criteria for the safety gap shown in Table 1 below.
- the insertion length (L1) is the length of the portion where the gap (T) is kept below a predetermined value.
- the insertion length (L1) is also called the engagement length.
- a circular arc-shaped corner (111a) is formed at the corner of the tip (connection with the cover portion (113)) of the first tubular portion (111) of the terminal body (110) in the separation direction (E).
- the gap (T) between the first tubular portion (111) and the second tubular portion (126) may not be equal to or smaller than a predetermined value. It is preferable that the insertion length (L1) be set so as not to include the corner (111a).
- the insertion length (L1) of the first cylindrical portion (111) of the terminal body (110) inserted into the second cylindrical portion (126) of the terminal box (120) is shorter than the overall length (L0) by the amount excluding the radius (111a).
- a flame (F) may occur in the accommodation space (120a) in the terminal box (120) that accommodates the terminal rod (100).
- the flame (F) is promoted by oxygen. Since a large amount of oxygen is present in the atmosphere in the external space (120b) outside the terminal box (120), it is necessary to prevent the flame (F) occurring in the accommodation space (120a) in the terminal box (120) from escaping to the external space (120b) outside the terminal box (120).
- the flame (F) occurs, for example, in the following manner.
- the insulating material (130) between the terminal rod (100) and the terminal body (110) melts, and the terminal rod (100) comes off the terminal body (110).
- the terminal rod (100) that has come off the terminal body (110) may be blown off by the internal pressure of the compressor (10) and come into contact with the metal casing (20). At this time, a spark occurs between the terminal rod (100) and the casing (20).
- the refrigerant (G) used in the compressor (10) is flammable, the refrigerant (G) that leaks out of the casing (20) from the part where the terminal rod (100) has come off (the first hole (29) in the outer wall (28) of the casing (20)) will mix with the air (containing oxygen) present outside the casing (20) and create a flammable atmosphere. If a spark occurs in this state, it may ignite outside the casing (20) and cause a flame (F).
- the terminal box (120) is fixed to the outer wall (28) of the casing (20) so as to cover the first hole (29) of the outer wall (28) of the casing (20).
- the flame (F) occurring outside the casing (20) is confined to the storage space (120a) in the terminal box (120) (the flame (F) occurs in the storage space (120a) in the terminal box (120)).
- the flame (F) generated in the storage space (120a) inside the terminal box (120) necessarily passes through the gap (T) between the first cylindrical portion (111) of the terminal body (110) and the second cylindrical portion (126) of the terminal box (120) to escape to the external space (120b) outside the terminal box (120).
- Table 1 shows the design criteria for safety gaps.
- the safety gap is the maximum gap (T) that can extinguish the flame (F) before it passes through the gap (T).
- the gap (T) should be set to the value shown in [Table 1] or less.
- the maximum gap (T) (safety gap) is determined by the type of refrigerant (G), the insertion length (L1) and the internal volume (V).
- the unit of the maximum gap (T) (safety gap) is [mm].
- the unit of the insertion length (L1) is [mm].
- the unit of the internal volume (V) is [ cm2 ].
- [Table 1] shows an example where the type of refrigerant (G) is propane, but it can also be used with other types of refrigerants. Because propane is highly flammable, the value of the gap (T) shown in [Table 1] is set strictly (small). When the type of refrigerant (G) is other than propane, the value of the gap (T) may be more lenient (larger) than the value shown in [Table 1].
- the maximum gap (T) (safety gap) is smaller as the insertion length (L1) is smaller and larger as the insertion length (L1) is larger.
- the maximum gap (T) (safety gap) is larger as the internal volume (V) is smaller and smaller as the internal volume (V) is larger.
- the maximum gap (T) (safety gap) between the first cylindrical portion (111) of the terminal body (110) and the second cylindrical portion (126) of the terminal box (120) is 0.4 mm or less.
- the insertion length (L1) of the first cylindrical portion (111) of the terminal body (110) inserted into the second cylindrical portion (126) of the terminal box (120) is 6 mm or more.
- a flame (F) generated in the accommodation space (120a) in the terminal box (120) passes through a gap (T) between the first cylindrical portion (111) of the terminal body (110) and the second cylindrical portion (126) of the terminal box (120) to escape to an external space (120b) outside the terminal box (120).
- the flame (F) is extinguished before passing through the gap (T).
- the compressor (10) can prevent the flame (F) generated in the storage space (120a) inside the terminal box (120) from escaping to the external space (120b) outside the terminal box (120).
- the maximum gap (T) (safety gap) between the first cylindrical portion (111) of the terminal body (110) and the second cylindrical portion (126) of the terminal box (120) 0.4 mm or less, it becomes more advantageous to extinguish the flame (F) before it passes through the gap (T).
- the first tubular portion (111) of the terminal body (110) extends straight and has a circular cross section (is cylindrical), and the second tubular portion (126) of the terminal box (120) also extends straight and is cylindrical, making it easy to insert the first tubular portion (111) of the terminal body (110) into the second tubular portion (126) of the terminal box (120).
- the terminal rod (100) is connected to a lead wire (73a) as wiring (K) to the electric motor (70) inside the casing (20).
- a large current is likely to flow through the terminal rod (100) connected to the electric motor (70) via the lead wire (73a). It is useful to take measures against flames (F) that may occur around the terminal rod (100) where a large current is likely to occur.
- FIG. 9 is a view equivalent to FIG. 3 according to the conventional technology.
- the terminal body (110') does not protrude in a direction away from the outer wall (28) of the casing (20).
- the terminal box (120') does not have a second cylindrical portion (126). For this reason, it was necessary to keep the gap (H) between the outer wall (28) of the casing (20) and the bottom wall portion (121') of the terminal box (120') below a safe gap. For this reason, in the compressor (10') according to the conventional technology, it was necessary to caulk or fill the gap (H) with a sealing material in order to keep the gap (H) below a safe gap.
- the gap (T) between the first cylindrical portion (111) of the terminal body (110) and the second cylindrical portion (126) of the terminal box (120) is kept below the safety gap.
- the compressor (10) of this embodiment makes it easier to ensure a safety gap compared to the compressor (10') of the prior art.
- a gap (H) is easily formed between the arc-shaped outer wall (28) of the casing (20) and the bottom wall portion (121) of the terminal box (120), so that the advantage of inserting the first cylindrical portion (111) of the terminal body (110) into the second cylindrical portion (126) of the terminal box (120) can be more fully enjoyed.
- FIG. 7 is a view according to the second embodiment, which corresponds to Fig. 3.
- the same components as those in the above embodiment will be denoted by the same reference numerals, and detailed description thereof may be omitted.
- the terminal body (110) is solid and cylindrical (rod-shaped).
- the terminal body (110) extends straight.
- the terminal body (110) has a circular cross section when viewed in the extension direction of the terminal body (110).
- FIG. 8 is a view corresponding to Fig. 3 according to the third embodiment.
- Fig. 8 is simplified more than Fig. 3.
- the same components as those in the above embodiment are denoted by the same reference numerals, and detailed description thereof may be omitted.
- the terminal body (110) is tapered and decreases in diameter in the separation direction (E).
- the second cylindrical portion (126) of the terminal box (120) is tapered and decreases in diameter in the separation direction (E).
- the maximum gap (T) (safety gap) and the insertion length (L1) do not necessarily have to be set according to Table 1. For example, if the type of refrigerant (G) is not highly flammable propane, these values may be set more leniently than the values shown in Table 1.
- the maximum gap (T) (safety gap) may be greater than 0.4 mm.
- the insertion length (L1) may be less than 6 mm.
- the type of refrigerant (G) may be other than propane.
- the refrigerant (G) may be highly flammable, combustible, slightly flammable or non-flammable.
- the refrigerant (G) may be, for example, ammonia (R717), methane (R50), ethane (R170), butane (R600), isobutane (R600a), R152a, R32, R1234yf, R1234ze, R410A, R134a, R407C, etc.
- the refrigerant (G) may be a mixed refrigerant containing two or more of these refrigerants.
- the refrigerant (G) may be other than those mentioned above.
- the second cylindrical portion (126) of the terminal body (110) and the terminal box (120) may be tapered and may increase in diameter in the separation direction (E).
- the second tube portion (126) of the terminal box (120) may not be cylindrical, but may be, for example, rectangular.
- the terminal body (110) may have a rectangular cross section.
- the tip of the second cylindrical portion (126) of the terminal box (120) on the separation direction (E) side may protrude beyond the tip of the terminal body (110) on the separation direction (E) side.
- the two may be flush with each other.
- the outer wall (28) of the casing (20) may be flat instead of arc-shaped.
- the first cylindrical portion (111) of the terminal body (110) and the second cylindrical portion (126) of the terminal box (120) are in a clearance fit relationship, but this is not limited thereto, and they may be in an interference fit relationship or an intermediate fit relationship.
- the gap (T) may be zero (it is preferable that the gap (T) is zero).
- the electric motor (70) is given as an example of the device (J) in the casing (20) to which the wiring (K) is connected to the terminal rod (100), but this is not limiting.
- the device (J) in the casing (20) may be, for example, another device such as a measuring device or a magnetic bearing.
- the compressor (10) may be placed horizontally.
- the axial direction (Z) of the drive shaft (40) may extend horizontally.
- the compressor (10) is not limited to a scroll compressor, but may be another type of compressor, such as a rotary compressor, a screw compressor, or a turbo compressor.
- the compressor (10) does not have to be applied to the refrigeration system (1) and may be used, for example, as a standalone unit.
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Abstract
Description
(冷凍装置)
第1実施形態に係る圧縮機(10)について説明する。圧縮機(10)は、冷凍装置(1)に適用される。図1は、冷凍装置(1)を示す。冷凍装置(1)は、作動流体としての冷媒が循環する冷媒回路(1a)を、含む。冷凍装置(1)の冷媒回路(1a)は、圧縮機(10)と、凝縮器(放熱器)(2)と、減圧機構(膨張機構)(3)と、蒸発器(4)と、を備える。減圧機構(3)は、例えば、膨張弁やキャピラリーチューブなどである。冷媒回路(1a)は、蒸気圧縮式の冷凍サイクルを行う。冷凍装置(1)は、例えば、空気調和機や冷却機などに適用される。
図2は、圧縮機(10)を正面断面図で示す。本例では、圧縮機(10)は、スクロール圧縮機である。圧縮機(10)は、ケーシング(20)と、圧縮機構(30)と、駆動軸(40)と、ハウジング(50)と、バランスウエイト(60)と、電動機(70)と、下部軸受部材(80)と、油ポンプ(90)と、ターミナルロッド(100)と、ターミナルボディ(110)と、ターミナルボックス(120)と、を備える。
ケーシング(20)は、圧縮機構(30)と、駆動軸(40)と、ハウジング(50)と、バランスウエイト(60)と、電動機(70)と、下部軸受部材(80)と、油ポンプ(90)と、を収容する。
圧縮機構(30)は、ケーシング(20)内に設けられている。圧縮機構(30)は、作動流体としての冷媒(G)(例えば冷媒ガスなど)を圧縮する。本例では、冷媒(G)は、プロパンである。プロパンは、強燃性を有し、燃えやすい。圧縮機構(30)は、固定スクロール(31)と、可動スクロール(35)と、を有する。可動スクロール(35)は、固定スクロール(31)に噛み合わされる。
駆動軸(40)は、ケーシング(20)内を軸方向(上下方向)に延びている。駆動軸(40)は、主軸部(41)と、偏心軸部(42)と、を有する。偏心軸部(42)は、主軸部(41)の上端に設けられている。偏心軸部(42)の外径は、主軸部(41)の外径よりも小さい。偏心軸部(42)の軸心(42a)は、主軸部(41)の軸心(41a)に対して、所定距離だけ偏心している。
ハウジング(50)は、軸方向(上下方向)に延びる略円筒状である。ハウジング(50)は、ケーシング(20)内において、可動スクロール(35)の下方且つバランスウエイト(60)の上方に設けられている。ハウジング(50)の内周には、駆動軸(40)が挿入されている。ハウジング(50)の上側部分の外径は、ハウジング(50)の下側部分の外径よりも大きい。ハウジング(50)の上側部分の外周面は、ケーシング(20)の胴部(21)の内周面に固定されている。
バランスウエイト(60)は、圧縮機構(30)の可動スクロール(35)の旋回運動により生じる不釣合力を打ち消すためにある。バランスウエイト(60)は、ケーシング(20)内において、ハウジング(50)の下方且つ電動機(70)の上方に設けられている。バランスウエイト(60)は、駆動軸(40)の主軸部(41)に設けられている。バランスウエイト(60)は、駆動軸(40)と一体に回転する。バランスウエイト(60)は、ウエイト部(61)と、非ウエイト部(62)と、カバー(63)と、で構成されている。
電動機(70)は、モータとも呼ばれる。電動機(70)は、ケーシング(20)内において、バランスウエイト(60)の下方且つ下部軸受部材(80)の上方に設けられている。電動機(70)は、ケーシング(20)内の機器(J)の一種である。電動機(70)は、駆動軸(40)を回転させることによって、圧縮機構(30)を駆動する。電動機(70)は、回転子(71)と、固定子(72)と、コイル(73)と、インシュレータ(74)と、含む。
下部軸受部材(80)は、軸方向(上下方向)に延びる略円筒状である。下部軸受部材(80)は、ケーシング(20)内において、電動機(70)と油貯留部(27)(ケーシング(20)の下底部)との間に設けられている。下部軸受部材(80)は、円筒部(81)と、突出部(82)と、油分離板(83)と、を含む。
油ポンプ(90)は、ポンプ部(91)と、ノズル部(92)と、を含む。ポンプ部(91)は、駆動軸(40)の主軸部(41)の下端部に設けられている。ポンプ部(91)は、駆動軸(40)と一体的に回転する。ノズル部(92)は、下部軸受部材(80)の円筒部(81)の下端部に固定されている。ノズル部(92)は、油貯留部(27)に貯留された潤滑油(L)に、浸かっている。
圧縮機(10)の運転動作について説明する。電動機(70)が駆動すると、駆動軸(40)が回転して、圧縮機構(30)の可動スクロール(35)が駆動される。可動スクロール(35)は、自転が規制された状態で、駆動軸(40)の主軸部(41)の軸心(41a)を中心に公転する。
以下、ケーシング(20)の外壁(28)とターミナルロッド(100)とターミナルボディ(110)とターミナルボックス(120)との関係について、図3~6を参照しながら説明する。
図3に示すように、ケーシング(20)の胴部(21)は、外壁(28)を含む。外壁(28)は、ケーシング(20)の内外を仕切っている。外壁(28)は、駆動軸(40)の軸方向(上下方向)及び周方向に延びている。外壁(28)の内面は、ケーシング(20)の内側に臨んでいる。外壁(28)の外面は、ケーシング(20)の外側に臨んでいる。外壁(28)は、金属からなる。
図3に示すように、ターミナルロッド(100)は、棒状である。ターミナルロッド(100)は、真直ぐに延びている。ターミナルロッド(100)は、金属からなる。
図3に示すように、ターミナルボディ(110)は、有底円筒状である。ターミナルボディ(110)は、中空である。ターミナルボディ(110)は、金属からなる。ターミナルボディ(110)は、プレス形成されている。ターミナルボディ(110)は、外壁(28)の第1穴部(29)に配置されている。ターミナルボディ(110)は、第1筒部(111)と、係止部(112)と、蓋部(113)と、を含む。
図3に示すように、ターミナルボックス(120)は、箱形状である。ターミナルボックス(120)は、直方体状である。ターミナルボックス(120)は、金属からなる。ターミナルボックス(120)は、外壁(28)よりもケーシング(20)の外側に位置する。ターミナルボックス(120)は、ケーシング(20)の外壁(28)に固定されている。
圧縮機(10)の運転中に異常があると、ターミナルロッド(100)を収容したターミナルボックス(120)内の収容空間(120a)で、火炎(F)が生じる可能性がある。火炎(F)は、酸素によって促進される。ターミナルボックス(120)外の外部空間(120b)の大気には酸素が大量に存在するため、ターミナルボックス(120)内の収容空間(120a)で生じた火炎(F)をターミナルボックス(120)外の外部空間(120b)へ出さないようにする必要がある。
図3に示すように、本実施形態に係る圧縮機(10)によれば、ターミナルボックス(120)内の収容空間(120a)で生じた火炎(F)は、ターミナルボックス(120)外の外部空間(120b)へ出るために、ターミナルボディ(110)の第1筒部(111)とターミナルボックス(120)の第2筒部(126)との隙間(T)を通過する。火炎(F)は、隙間(T)を通過するまでに消失される。
第2実施形態に係る圧縮機(10)について説明する。図7は、第2実施形態に係る図3相当図である。以下の説明において、上記実施形態と同様の構成については、同じ符号を付し、詳細な説明を省略する場合がある。
第3実施形態に係る圧縮機(10)について説明する。図8は、第3実施形態に係る図3相当図である。なお、図8は、図3よりも簡略化されている。以下の説明において、上記実施形態と同様の構成については、同じ符号を付し、詳細な説明を省略する場合がある。
最大の隙間(T)(安全隙間)の値及び挿入長(L1)の値の設定にあたって、必ずしも、[表1]に従う必要はない。例えば、冷媒(G)の種類が強燃性のプロパンでない場合、これらの値を、[表1]に示される値よりも緩やかに設定してもよい。最大の隙間(T)(安全隙間)は、0.4mmよりも大きくてよい。挿入長(L1)は、6mmよりも小さくてよい。
K 配線
V 内容積
L1 挿入長
T 隙間
F 火炎
1 冷凍装置
10 圧縮機
20 ケーシング
21 胴部
28 外壁
29 第1穴部
30 圧縮機構
40 駆動軸
50 ハウジング
60 バランスウエイト
70 電動機
73 コイル
73a リード線
80 下部軸受部材
90 油ポンプ
100 ターミナルロッド
110 ターミナルボディ
111 第1筒部
120 ターミナルボックス
120a 収容空間
120b 外部空間
121 底壁部
122 第2穴部
122a 周縁
126 第2筒部
Claims (7)
- 圧縮機構(30)と、
前記圧縮機構(30)を収容するケーシング(20)と、
前記ケーシング(20)内の機器(J)への配線(K)が接続されるターミナルロッド(100)を保持し且つ前記ケーシング(20)の外壁(28)に固定されたターミナルボディ(110)と、
前記ケーシング(20)の前記外壁(28)に固定され且つ前記ターミナルボディ(110)に保持された前記ターミナルロッド(100)を収容するターミナルボックス(120)と、を備え、
前記ターミナルボディ(110)は、前記ケーシング(20)から離れる方向(E)に突出しており、
前記ターミナルボックス(120)は、
前記ケーシング(20)の前記外壁(28)に固定された底壁部(121)と、
前記底壁部(121)に空けられ且つ前記ターミナルボディ(110)が通る穴部(122)と、
前記ケーシング(20)から離れる方向(E)に向かって前記穴部(122)の周縁(122a)から延びる筒部(126)と、を含み、
前記ターミナルボディ(110)は、前記筒部(126)に挿入されている、
圧縮機。 - 前記ターミナルボディ(110)が前記筒部(126)に挿入される挿入長(L1)は、6mm以上である、
請求項1に記載の圧縮機。 - 前記ターミナルボディ(110)と前記筒部(126)との隙間(T)は、0.4mm以下である、
請求項1又は2に記載の圧縮機。 - 前記筒部(126)は、真直ぐに延びる円筒状であり、
前記ターミナルボディ(110)は、真直ぐに延び且つ円形断面を有する、
請求項1から3のいずれか1つに記載の圧縮機。 - 前記圧縮機構(30)を駆動する電動機(70)を備え、
前記ケーシング(20)は、前記圧縮機構(30)及び前記電動機(70)を収容しており、
前記ターミナルロッド(100)には、前記電動機(70)への配線(K)が接続される、
請求項1から4のいずれか1つに記載の圧縮機。 - 前記外壁(28)は、円弧状である、
請求項1から5のいずれか1つに記載の圧縮機。 - 請求項1から6のいずれか1つに記載の圧縮機(10)を備える、
冷凍装置。
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| CN202480043488.8A CN121443847A (zh) | 2023-06-30 | 2024-05-08 | 压缩机及制冷装置 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4864701U (ja) * | 1971-11-24 | 1973-08-16 | ||
| JPS6132761U (ja) | 1984-07-27 | 1986-02-27 | 株式会社東芝 | 密閉形圧縮機 |
| US20130011279A1 (en) * | 2011-07-08 | 2013-01-10 | Lamar Wilson Thibodeaux | Secure connection terminal for hermetic compressor |
| JP2014216396A (ja) * | 2013-04-24 | 2014-11-17 | 日立アプライアンス株式会社 | 電源端子箱構造及びこれを用いた圧縮機 |
| JP2019002352A (ja) * | 2017-06-15 | 2019-01-10 | ダイキン工業株式会社 | 圧縮機 |
| JP2019210908A (ja) * | 2018-06-07 | 2019-12-12 | ダイキン工業株式会社 | 圧縮機のターミナル構造 |
-
2023
- 2023-06-30 JP JP2023108245A patent/JP7620237B1/ja active Active
-
2024
- 2024-05-08 EP EP24831417.1A patent/EP4729774A1/en active Pending
- 2024-05-08 WO PCT/JP2024/017125 patent/WO2025004544A1/ja not_active Ceased
- 2024-05-08 CN CN202480043488.8A patent/CN121443847A/zh active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4864701U (ja) * | 1971-11-24 | 1973-08-16 | ||
| JPS6132761U (ja) | 1984-07-27 | 1986-02-27 | 株式会社東芝 | 密閉形圧縮機 |
| US20130011279A1 (en) * | 2011-07-08 | 2013-01-10 | Lamar Wilson Thibodeaux | Secure connection terminal for hermetic compressor |
| JP2014216396A (ja) * | 2013-04-24 | 2014-11-17 | 日立アプライアンス株式会社 | 電源端子箱構造及びこれを用いた圧縮機 |
| JP2019002352A (ja) * | 2017-06-15 | 2019-01-10 | ダイキン工業株式会社 | 圧縮機 |
| JP2019210908A (ja) * | 2018-06-07 | 2019-12-12 | ダイキン工業株式会社 | 圧縮機のターミナル構造 |
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| EP4729774A1 (en) | 2026-04-22 |
| JP2025015863A (ja) | 2025-01-31 |
| JP7620237B1 (ja) | 2025-01-23 |
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