Classifications

• • 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
  • 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
  • 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
• • 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
  • F04C2230/00—Manufacture
  • F04C2230/20—Manufacture essentially without removing material
  • F04C2230/23—Manufacture essentially without removing material by permanently joining parts together
  • F04C2230/231—Manufacture essentially without removing material by permanently joining parts together by welding
• • 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
  • F04C2230/00—Manufacture
  • F04C2230/60—Assembly methods
  • F04C2230/603—Centering; Aligning
• • 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
  • 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
  • F04C23/001—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 of similar working principle
• • 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

Definitions

• the present disclosure relates to a compressor and an assembly method for the same.
• a compressor provided with a compression portion that compresses a refrigerant inside a housing is known (refer to PTL 1).
• a cylindrical support frame is used to adjust the axial center of the compression portion.
• the support frame is fixed to the housing by spot welding.
• the present disclosure has been made in view of such circumstances, and an object of the present disclosure is to provide a compressor and an assembly method therefor, in which it is possible to easily perform centering of a compression portion with respect to a housing.
• a compressor of the present disclosure includes: a housing; a compression portion accommodated in the housing; a rotary shaft portion that drives the compression portion; a welding fixation portion that welds and fixes the compression portion to the housing; and a shim inserted between an outer peripheral surface of the compression portion and an inner peripheral surface of the housing.
• An assembly method for assembling a compressor of the present disclosure is a method for assembling a compressor including a housing, a compression portion accommodated in the housing, and a rotary shaft portion that drives the compression portion, the method including: an insertion step of inserting the compression portion into the housing such that an inner peripheral surface of the housing is in contact with the compression portion; a shim attachment step of attaching a shim to a gap between an outer peripheral surface of the compression portion and the inner peripheral surface of the housing; and a welding and fixing step of welding and fixing the compression portion to the housing.
• a compressor 1 is used for an air conditioner and compresses a refrigerant R, which is, for example, a gas such as carbon dioxide, in two stages.
• the compressor 1 is fixed to an installation surface FL via a leg portion 3.
• the compressor 1 includes a housing 11 and includes a rotary compression mechanism (compression portion) 12, a scroll compression mechanism 13, an electric motor 14, and a rotary shaft (rotary shaft portion) 15, which are provided inside the housing 11.
• the housing 11 has a main body portion 21 having a cylindrical shape, and an upper cover portion 22 and a lower cover portion 23 that close upper and lower openings of the main body portion 21.
• the inside of the housing 11 forms a sealed space.
• the main body portion 21 of the housing 11 is manufactured by cutting a tubular material or a round rod material, and has higher dimensional accuracy than a product manufactured by bending a flat plate and welding end portions. Therefore, a welding line extending in an axial direction is not formed in the main body portion 21.
• the rotary shaft 15 is provided to extend vertically along an axis X inside the housing 11.
• the upper end (one end) side of the rotary shaft 15 is rotatably supported by an upper bearing 31.
• the lower end (the other end) side of the rotary shaft 15 is rotatably supported by a lower bearing 32.
• the lower bearing 32 is integrally assembled with the rotary compression mechanism 12, and constitutes a rotary compression portion (compression portion) together with the rotary compression mechanism 12.
• the electric motor 14 is disposed at the center of the rotary shaft 15 in the longitudinal direction and on the outer peripheral side of the rotary shaft 15, and rotates the rotary shaft 15 around the axis X.
• the electric motor 14 includes a rotor 38 which is fixed to the outer peripheral surface of the rotary shaft 15, and a stator 39 which is fixed to an inner wall of the main body portion 21 of the housing 11 by being shrink-fitted or the like and faces the outer peripheral surface of the rotor 38 in the radial direction with a gap therebetween.
• the rotor 38 is provided with rotor passages 38a which are provided with predetermined intervals in the circumferential direction. Each rotor passage 38a penetrates the rotor 38 in the vertical direction (axis X direction). The refrigerant discharged from a rotary compression mechanism 12 flows upward through the rotor passages 38a.
• An oil separation plate 38b is fixed to an upper portion of the rotor 38.
• the oil separation plate 38b has a disk shape and is disposed to extend in the horizontal direction. The oil separation plate 38b rotates around the axis X together with the rotor 38.
• a plurality of stator passages 39a are formed on the outer periphery of the stator 39 with predetermined angular intervals in the circumferential direction.
• the rotary compression mechanism 12 is provided inside the housing 11 on the lower end (the other end) side of the rotary shaft 15.
• the rotary compression mechanism 12 is a two-cylinder mechanism in the present embodiment, and includes an eccentric shaft portion 41 which is provided on the rotary shaft 15, a rotor 42 which is fixed to the eccentric shaft portion 41 and rotates eccentrically with respect to the axis X as the rotary shaft 15 rotates in a compression chamber C1, and a cylinder 44 in which the compression chamber C1 is formed.
• the fixed scroll 51 has an end plate 52 fixed to an upper surface of the upper bearing 31, and a fixed wrap 53 protruding downward from the end plate 52.
• a discharge hole 52a penetrating upward and downward is formed in a central portion (in the vicinity of the axis X) of the end plate 52.
• the orbiting scroll 57 is disposed to be interposed between the upper bearing 31 and the fixed scroll 51.
• the orbiting scroll 57 has an end plate 58 connected to the upper end side of the rotary shaft 15, and an orbiting wrap 59 protruding upward from the end plate 58.
• the end plate 58 is connected to the eccentric shaft portion 56 provided at the upper end of the rotary shaft 15 via the drive bush 55, and performs an orbiting motion while being eccentric with respect to the axis X as the rotary shaft 15 rotates.
• the orbiting wrap 59 meshes with the fixed wrap 53 to form a compression chamber C2 for compressing the refrigerant R between the orbiting wrap 59 and the fixed wrap 53.
• the refrigerant R which is compressed by the rotary compression mechanism 12 and discharged into the housing 11, is sucked into the compression chamber C2 from the outer peripheral side of the scroll compression mechanism 13 and is compressed toward the central side.
• the compressed refrigerant R is discharged from a discharge pipe 34 to the outside of the housing 11 via the discharge hole 52a of the fixed scroll 51.
• a cover 45 is provided below the upper bearing 31 to cover the upper bearing 31.
• the cover 45 is formed by sheet metal processing, and has a substantially conical shape that is expanded in diameter from the lower side to the upper side.
• the upper end of the cover 45 on the outer peripheral side is fixed to the upper bearing 31 by bolts or the like.
• a suction opening 45a is provided at the lower end of the cover 45. That is, the suction opening 45a faces downward and is an annular region formed between the cover 45 and the rotary shaft 15.
• the space below the housing 11 and the space on the upper bearing 31 side are partitioned by the cover 45, and the refrigerant which is sucked from the suction opening 45a is guided to the scroll compression mechanism 13.
• An oil level tank 60 is provided outside and below the housing 11.
• the oil level tank 60 is regarded as a hollow container and communicates with the inside of the housing 11 via a lower pipe 61 and an upper pressure equalization pipe 62.
• the oil level tank 60 measures the oil level of the oil reservoir O1 by guiding the oil from the oil reservoir O1 in the housing 11 via the lower pipe 61.
• a downstream end of the oil separator oil return pipe 65 is connected to a lower side portion of the housing 11.
• An upstream end of the oil separator oil return pipe 65 is connected to an oil separator (not shown in the drawing).
• the oil separator separates the oil from the refrigerant discharged from the compressor 1, and the separated oil is returned to the oil reservoir O1 in the housing 11 via the oil separator oil return pipe 65.
• a height position, at which the downstream end of the oil separator oil return pipe 65 is connected to the housing 11, is set below the lower bearing 32.
• An oil return pipe 67 which extends in the vertical direction while coming into contact with the inner wall of the housing 11, is provided inside the housing 11.
• the oil return pipe 67 is provided such that an upper end (one end) thereof is fixed to the upper bearing 31 and a lower end (the other end) thereof is positioned at the oil reservoir O1 in the lower portion of the housing 11.
• Fig. 2 shows a cross section of the lower bearing 32 as viewed from the side.
• the lower bearing 32 includes a central cylindrical portion 32a and three arm portions 32b extending in the radial direction from the cylindrical portion 32a.
• the respective arm portions 32b are disposed at an angle of 120° at an equal angular interval in the circumferential direction.
• the tips of the respective arm portions 32b are fixed to the inner surface of the housing 11 by a plug welded portion (welding fixation portion) 35 where plug welding is performed.
• a shim 37 is provided between the outer peripheral surface of each of the arm portions 32b and the inner peripheral surface of the housing 11.
• the shim 37 fills a gap between the outer peripheral surface of each of the arm portions 32b and the inner peripheral surface of the housing 11.
• the shim 37 is fixed to the arm portion 32b by the bolt (fixing portion) 40.
• Fig. 3 shows a partially enlarged longitudinal cross-sectional view of a position where the shim 37 is attached.
• the shim 37 has an L-shape bent at a substantially right angle in a longitudinal cross-sectional view as shown in the drawing.
• Fig. 4A shows an expanded state before the shim 37 is bent at an approximately right angle.
• the shim 37 is a metal plate-shaped body such as a steel plate hot commercial (SHPC).
• SHPC steel plate hot commercial
• the thickness of the shim 37 is, for example, 0.1 mm or more and 0.6 mm or less. However, the thickness of the shim 37 is determined according to a gap between the inner peripheral surface of the housing 11 formed at the time of assembly and the outer peripheral surface of the arm portion 32b.
• the shim 37 includes a main body portion 37a provided at one end, a fixing piece portion 37b provided at the other end, and a connecting portion 37c connecting the main body portion 37a and the fixing piece portion 37b.
• the main body portion 37a of the shim 37 fills a gap between the inner peripheral surface of the housing 11 and the outer peripheral surface of the arm portion 32b in the attachment state shown in Fig. 3 .
• the main body portion 37a has an arc-shaped tip, and a plug welding hole portion 37a1 having a round hole is formed in the center. Since the tip of the main body portion 37a has an arc shape, resistance is reduced when the scroll compression portion is inserted into the housing 11 at the time of assembly. As shown in Fig.
• the plug welding hole portion 37a1 of the main body portion 37a has a shape in which the plug welded portion 35 can be secured, and the gap between the inner peripheral surface of the housing 11 and the outer peripheral surface of the arm portion 32b can be filled with the main body portion 37a in the vicinity of the periphery of the plug welded portion 35.
• the fixing piece portion 37b of the shim 37 is attached to an end surface that is connected to the outer peripheral surface of the arm portion 32b.
• a fixing hole portion 37b1 formed as a round hole is formed at the center of the fixing piece portion 37b.
• the shim 37 is fixed to the arm portion 32b by attaching the bolt 40 to be inserted into the fixing hole portion 37b1.
• the connecting portion 37c of the shim 37 is located between the main body portion 37a and the fixing piece portion 37b, and the width dimension (dimension in the right-left direction in Fig. 4A ) is smaller than the main body portion 37a and the fixing piece portion 37b. Accordingly, the shim 37 can be easily bent into an L-shape.
• the shim 37 is bent into an L-shape around the connecting portion 37c by press working or the like, and has a shape as shown in Fig. 4B .
• the compressor 1 having the above-described configuration operates as follows.
• the refrigerant evaporated in an evaporator (not shown) is sucked into the compressor 1 from the suction pipe 33 via the suction boss 36, and is compressed by the rotary compression mechanism 12.
• the refrigerant compressed by the rotary compression mechanism 12 is discharged from the rotary discharge pipe 43 into the housing 11.
• the refrigerant discharged into the housing 11 is sucked from the suction opening 45a of the cover 45, and is guided to the scroll compression mechanism 13 through a flow path in the cover 45 to be compressed.
• the refrigerant compressed by the scroll compression mechanism 13 is discharged from the discharge pipe 34 to an external gas cooler or condenser through the discharge hole 52a of the fixed scroll 51.
• an assembly jig that supports both the housing 11 side and the assembly on the rotary compression portion side in the state of Fig. 5 and inserts the rotary compression portion while aligning the axes of the rotary compression portion and the housing 11 is required.
• Such an assembly jig has a large size, and thus the manufacturing cost increases.
• the thickness of the shim 37 is, for example, 0.1 mm or more and 0.6 mm or less, and is obtained by being calculated or measured from dimensional accuracy of the inner peripheral surface of the main body portion 21 of the housing 11 and dimensional accuracy of the outer peripheral surface of the arm portion 32b of the lower bearing 32. That is, since the desired dimensional accuracy can be obtained by cutting the inner peripheral surface of the main body portion 21 and the outer peripheral surface of the arm portion 32b, the lower bearing 32 can be centered by the shim 37 having a thickness of 0.1 mm or more and 0.6 mm or less.
• the rotary compression portion is fixed to the housing 11 by performing plug welding on the tips of the arm portions 32b of the lower bearing 32 (refer to the plug welded portion 35 in Fig. 3 ) (welding and fixing step).
• the rotary compression portion is fixed to the housing 11 by providing the plug welded portion 35 on the outer peripheral surface of each of the plurality of arm portions 32b extending in the radial direction. Then, since the shim 37 is disposed around the plug welded portion 35, the welding fixation is accurately performed in a state where the rotary compression portion is centered by the shim 37.
• the plug welding can be performed.
• the gap can be reliably adjusted around the plug welded portion 35 by the shim 37. It is desirable that the hole diameter of the plug welding hole portion 37a1 of the shim 37 is larger than the hole diameter of the plug welded portion 35 so as not to hinder the plug welding.
• a hole portion (37a1, 37a2) is formed in the shim at a position corresponding to the welding fixation portion.
• the housing and the compression portion can be welded.
• the gap can be reliably adjusted around the welding fixation portion by the shim.
• the compressor in any one of the first aspect to the third aspect, the compressor further includes a fixing portion (40, 37b1, 37b2) that fixes the shim to the compression portion.
• the shim is fixed to the compression portion by the fixing portion, and thus it is possible to avoid the shim falling off the compression portion during the operation of the compressor.
• a hole portion for a bolt can be formed in the shim, and the shim can be fixed to the compression portion by the bolt.
• An assembly method for assembling a compressor is a method for assembling a compressor including a housing, a compression portion accommodated in the housing, and a rotary shaft portion that drives the compression portion, the method including: an insertion step of inserting the compression portion into the housing such that an inner peripheral surface of the housing is in contact with the compression portion; a shim attachment step of attaching a shim to a gap between an outer peripheral surface of the compression portion and the inner peripheral surface of the housing; and a welding and fixing step of welding and fixing the compression portion to the housing.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Applications Or Details Of Rotary Compressors (AREA)
• Compressor (AREA)
• Rotary Pumps (AREA)

Applications Claiming Priority (2)

Publications (2)

Family

ID=91195472

Family Applications (1)

Country Status (3)

Citations (1)

Family Cites Families (6)

• 2022
  • 2022-11-25 JP JP2022188403A patent/JP7532480B2/ja active Active
• 2023
  • 2023-10-26 EP EP23894366.6A patent/EP4621236A4/fr active Pending
  • 2023-10-26 WO PCT/JP2023/038771 patent/WO2024111354A1/fr not_active Ceased

Patent Citations (1)

Also Published As

Similar Documents

Legal Events