JP2018013064A - Rotary compressor and manufacturing method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary compressor capable of reducing sound radiation.SOLUTION: A rotary compressor 100 includes a casing 20, a drive shaft 40, a motor 30, and a compression mechanism 50, the casing 20 having a cylindrical member 21, the drive shaft 40 being provided in the casing 20, the motor 30 being connected to the drive shaft 40 for driving the drive shaft 40, the compression mechanism 50 being adapted to be driven via the drive shaft 40 by the motor 30 for compressing refrigerant, the compression mechanism 50 having a fixed part 52x for contacting the cylindrical member 21 along an inner peripheral face thereof, and being fixed to the inner peripheral face of the cylindrical member 21 in a closely contacting manner, the motor 30 being fixed to the inner peripheral face of the cylindrical member 21 at a space therefrom.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a rotary compressor.

  Conventionally, in a rotary compressor, a stator and a compression mechanism of a motor that drives a drive shaft are fixed to an inner surface of a casing. For example, Patent Document 1 (Japanese Patent Laid-Open No. 2015-197046) discloses a rotary compressor in which a stator is fixed to the center of the casing by shrink fitting and a compression mechanism is fixed to the lower portion of the casing by spot welding. .

  In the rotary compressor described in Patent Document 1 described above, since the compression mechanism and the casing are fixed by spot welding, a gap may be generated between the compression mechanism and the casing. For this reason, in this type of rotary compressor, the vibration of the compression mechanism is transmitted to the casing, and radiated sound may be generated.

  The subject of this invention is providing the rotary compressor which can reduce a radiated sound.

  A rotary compressor according to a first aspect of the present invention includes a casing, a drive shaft, a drive mechanism, and a compression mechanism. The casing has a cylindrical member. The drive shaft is disposed in the casing. The drive mechanism is coupled to the drive shaft and drives the drive shaft. The compression mechanism is driven by the drive mechanism via the drive shaft and compresses the refrigerant. In addition, the compression mechanism has a fixing portion that contacts the inner peripheral surface of the cylindrical member, and is fixed in a state of being in close contact with the inner peripheral surface of the cylindrical member. The drive mechanism is fixed to the inner peripheral surface of the cylindrical member with a gap.

  In the rotary compressor according to the first aspect, since the compression mechanism is fixed in close contact with the inner peripheral surface of the cylindrical member, the rigidity at the fixing position of the compression mechanism can be increased. As a result, transmission of vibration from the compression mechanism to the casing can be suppressed, and radiated sound generated in the compressor can be reduced. Further, since the drive mechanism is fixed to the inner peripheral surface of the cylindrical member with a gap, the centering of the drive shaft can be easily adjusted with respect to the compression mechanism.

  A rotary compressor according to a second aspect of the present invention is the rotary compressor according to the first aspect, wherein the compression mechanism includes a cylinder into which the refrigerant flows, a front head disposed above the cylinder, and a lower portion of the cylinder. A rear head. Further, at least one of the cylinder, the front head, and the rear head has a fixing portion along the inner peripheral surface of the cylindrical member, and is fixed in a state of being in close contact with the inner peripheral surface of the cylindrical member.

  In the rotary compressor according to the second aspect, the rigidity at the fixed position of the compression mechanism can be increased by bringing at least one shape of the cylinder, the front head, and the rear head into close contact with the inner peripheral surface of the cylindrical member.

  A rotary compressor according to a third aspect of the present invention is the rotary compressor according to the first aspect or the second aspect, wherein the drive mechanism is disposed outside the rotor and the rotor fixed to the drive shaft, and drives the rotor. And a stator. The stator is fixed to the inner peripheral surface of the cylindrical member with a gap.

  In the rotary compressor according to the third aspect, since the stator is fixed to the inner peripheral surface of the cylindrical member with a gap, the centering of the drive shaft can be easily adjusted with respect to the compression mechanism.

  A rotary compressor according to a fourth aspect of the present invention is the rotary compressor according to any one of the first to third aspects, wherein the clearance between the inner peripheral surface of the cylindrical member and the drive mechanism is 0.15 to 0.30 mm. is there.

  In the rotary compressor according to the fourth aspect, the centering of the drive shaft with respect to the compression mechanism can be adjusted within a predetermined range.

  A rotary compressor according to a fifth aspect of the present invention is the rotary compressor according to any one of the first to fourth aspects, wherein the clearance between the inner peripheral surface of the cylindrical member and the compression mechanism is 0.00 to 0.10 mm. is there.

  In the rotary compressor according to the fifth aspect, the compression mechanism can be fixed in close contact with the inner peripheral surface of the cylindrical member.

  A rotary compressor according to a sixth aspect of the present invention is the rotary compressor according to any one of the first to fifth aspects, wherein the inner peripheral surface of the cylindrical member and the drive mechanism are fixed by welding, caulking, or an adhesive. Or fixed by welding and adhesive or caulking and adhesive.

  In the rotary compressor according to the sixth aspect, the inner peripheral surface of the cylindrical member and the drive mechanism are fixed by welding, caulking, or an adhesive, or are fixed by welding and an adhesive or caulking and an adhesive. The drive mechanism can be fixed to the inner peripheral surface of the cylindrical member while adjusting the centering of the drive shaft with respect to the compression mechanism.

  A rotary compressor according to a seventh aspect of the present invention is the rotary compressor according to any one of the first to sixth aspects, wherein the inner peripheral surface of the cylindrical member and the compression mechanism are fixed by press-fitting and partial welding. Is.

  In the rotary compressor according to the seventh aspect, since the inner peripheral surface of the cylindrical member and the compression mechanism are fixed by press-fitting and partial welding, the compression mechanism can be fixed in close contact with the inner peripheral surface of the cylindrical member.

  A rotary compressor according to an eighth aspect of the present invention is the rotary compressor according to any one of the first to seventh aspects, in which the inner peripheral surface of the cylindrical member and the compression mechanism are fixed by shrink fitting.

  In the rotary compressor according to the eighth aspect, since the inner peripheral surface of the cylindrical member and the compression mechanism are fixed by shrinkage fitting, it is possible to fix the compression mechanism in a state of being in close contact with the inner peripheral surface of the cylindrical member.

  A method of manufacturing a rotary compressor according to a ninth aspect of the present invention includes a step of fixing a compression mechanism by press-fitting and partial welding so that the compression mechanism is in close contact with the inner peripheral surface of a cylindrical member of the casing, and the compression mechanism is a casing. After fixing to the casing, the step of arranging the drive mechanism in the casing, the step of moving the position of the drive mechanism to adjust the axis of the drive shaft, and the axis of the drive shaft are adjusted, and then the drive mechanism is welded , Caulking, and fixing with any one of the adhesives or any combination thereof.

  In the method according to the ninth aspect, since the rotary compressor with the compression mechanism fixed is manufactured in a state of being in close contact with the inner peripheral surface of the cylindrical member of the casing by press-fitting and partial welding over the entire circumference, It is possible to provide a rotary compressor capable of reducing the above. Further, since the shaft center of the drive shaft is adjusted after the compression mechanism is fixed, and then the drive mechanism is fixed, the centering of the drive shaft with respect to the compression mechanism can be easily adjusted.

  In the method of manufacturing the rotary compressor according to the tenth aspect of the present invention, in the method according to the ninth aspect, the fixing step further includes a step of shrink-fitting the compression mechanism to the casing.

  In the method according to the tenth aspect, the method further includes the step of shrink fitting, so that the degree of adhesion between the inner peripheral surface of the cylindrical member of the casing and the compression mechanism can be increased.

  In the rotary compressor according to the first aspect, it is possible to reduce radiated sound generated in the compressor. Further, the centering of the drive shaft can be easily adjusted with respect to the compression mechanism.

  In the rotary compressor according to the second aspect, the rigidity at the fixed position of the compression mechanism can be increased.

  In the rotary compressor according to the third aspect, the centering of the drive shaft can be easily adjusted with respect to the compression mechanism.

  In the rotary compressor according to the fourth aspect, the centering of the drive shaft with respect to the compression mechanism can be adjusted within a predetermined range.

  In the rotary compressor according to the fifth aspect, the compression mechanism can be fixed in close contact with the inner peripheral surface of the cylindrical member.

  In the rotary compressor according to the sixth aspect, the drive mechanism can be fixed to the inner peripheral surface of the cylindrical member while adjusting the centering of the drive shaft with respect to the compression mechanism.

  In the rotary compressor according to the seventh aspect, the compression mechanism can be fixed in close contact with the inner peripheral surface of the cylindrical member.

  In the rotary compressor according to the eighth aspect, the compression mechanism can be fixed to the inner peripheral surface of the cylindrical member so as to be further in close contact.

  The method according to the ninth aspect can provide a rotary compressor that can reduce radiated sound. Further, the centering of the drive shaft with respect to the compression mechanism can be easily adjusted.

  In the method according to the tenth aspect, the degree of adhesion between the inner peripheral surface of the cylindrical member of the casing and the compression mechanism can be increased.

It is a schematic diagram of air harmony device 1 in which rotary compressor 100 concerning one embodiment of the present invention is used. It is a schematic longitudinal cross-sectional view of the rotary compressor 100 which concerns on the same embodiment. It is a top view which shows typically the structure of the motor 30 which concerns on the same embodiment. It is an exploded perspective view showing typically the structure of compression mechanism 50 concerning the embodiment. It is a cross-sectional view which shows typically the structure of the cylinder 51 which concerns on the same embodiment. It is a top view which shows typically the structure of the front head 52 which concerns on the same embodiment. It is a figure for demonstrating the manufacturing method of the rotary compressor 100 which concerns on the same embodiment.

  A rotary compressor 100 according to an embodiment of the compressor of the present invention will be described with reference to the drawings. The rotary compressor 100 according to the following embodiment is merely an example of the rotary compressor of the present invention, and can be appropriately changed without departing from the spirit of the present invention.

(1) Outline of Air Conditioner Using Rotary Compressor FIG. 1 is a schematic view of an air conditioner 1 using a rotary compressor 100 according to an embodiment of the present invention. Here, the air conditioner dedicated to the cooling operation is shown, but the air conditioner employing the rotary compressor 100 may be dedicated to the heating operation, and both the cooling operation and the heating operation can be performed. It may be a thing.

  The air conditioner 1 mainly includes an outdoor unit 2 having a rotary compressor 100, an indoor unit 3, a liquid refrigerant communication pipe 4 and a gas refrigerant communication pipe 5 that connect the outdoor unit 2 and the indoor unit 3. The indoor unit 3 has an indoor heat exchanger 3a. The outdoor unit 2 mainly includes an accumulator 6, a rotary compressor 100, an outdoor heat exchanger 7, and an expansion valve 8. These devices are connected by refrigerant piping as shown in FIG. The refrigerant is sucked into the rotary compressor 100 through the suction pipe 23. Then, the refrigerant is compressed in the compression chamber C <b> 1 of the rotary compressor 100, and the compressed refrigerant is discharged from the discharge pipe 24.

(2) Overall Configuration of Rotary Compressor FIG. 2 is a schematic longitudinal sectional view of the rotary compressor 100. In the following description, expressions such as “up” and “down” may be used to indicate the positional relationship and direction of the rotary compressor 100, but unless otherwise specified, the direction of the arrow U in FIG. Upward direction.

  The rotary compressor 100 is a device that sucks and compresses the low-pressure refrigerant in the refrigerant circuit 10 and discharges the high-pressure refrigerant to the refrigerant circuit 10. In the rotary compressor 100, for example, R32 is used as a refrigerant. However, the type of refrigerant is not limited to this.

  The rotary compressor 100 is a one-cylinder rotary compressor, for example, as shown in FIG. The rotary compressor 100 mainly includes a casing 20, a motor 30, a drive shaft 40, and a compression mechanism 50. The casing 20 accommodates a motor 30, a drive shaft 40, and a compression mechanism 50. In the casing 20, the motor 30 is disposed in the vicinity of the central portion in the vertical direction of the casing 20, and the compression mechanism 50 is disposed below the motor 30.

(3) Detailed configuration of the rotary compressor (3-1) Casing The casing 20 is a vertical cylindrical container. The casing 20 includes a cylindrical cylindrical member 21 that is open at the top and bottom, and a bowl-shaped upper lid 22 a and a lower lid 22 b that are provided at the upper and lower ends of the cylindrical member 21 and close the upper and lower open ends of the cylindrical member 21, respectively. Have. The cylindrical member 21 and the upper lid 22a and the lower lid 22b are fixed by welding so as to keep airtightness.

  A suction pipe 23 connected to the compression mechanism 50 is provided below the cylindrical member 21. The suction pipe 23 supplies the low-pressure refrigerant in the refrigerant circuit 10 from the refrigerant circuit 10 into the compression mechanism 50 (specifically, to a compression chamber C1 of the compression mechanism 50 described later). A discharge pipe 24 is provided on the upper part of the cylindrical member 21. The discharge pipe 24 discharges the high-pressure refrigerant compressed by the compression mechanism 50 to the refrigerant circuit 10 (not shown).

  An oil reservoir space 25 is formed in the lower part of the casing 20. Refrigerating machine oil L for lubricating the compression mechanism 50 and the like is stored in the oil reservoir space 25.

(3-2) Motor The motor 30 is a mechanism that is connected to the drive shaft 40 and drives the drive shaft 40 and the compression mechanism 50. As shown in FIG. 2, the motor 30 is accommodated in a central portion in the vertical direction of the casing 20. The motor 30 is disposed above the compression mechanism 50.

  FIG. 3 is a plan view schematically showing the configuration of the motor 30. The motor 30 mainly includes a stator 31 and a rotor 32.

  The stator 31 is formed in an annular shape, and includes a cylindrical stator core 31a and a winding 31b wound around the stator core 31a. Stator core 31a consists of a plurality of laminated steel plates, for example. The winding 31b is wound around each tooth portion 31c of the stator core 31a. The stator 31 is fixed to the inner peripheral surface of the cylindrical member 21 with a gap. Specifically, the outer peripheral surface of the stator 31 is fixed to the inner surface of the cylindrical member 21 by spot welding. However, the fixing method of the stator 31 and the cylindrical member 21 is an illustration, and is not limited to this. For example, the inner peripheral surface of the cylindrical member 21 and the stator 31 may be fixed by welding, caulking, or an adhesive, or may be fixed by welding, an adhesive, caulking, and an adhesive. Further, the gap between the inner peripheral surface of the cylindrical member 21 and the stator 31 is approximately 0.15 to 0.30 mm.

  As shown in FIG. 3, a core cut 31d is formed between the inner peripheral surface of the cylindrical member 21 of the casing 20 and the outer peripheral surface of the stator core 31a. Here, three core cuts 31d are formed. The core cut 31d is a notch-shaped groove formed along the central axis from the upper end surface to the lower end surface, and functions as a distribution path for the refrigerant gas and the refrigerating machine oil. The distance between the inner peripheral surface of the cylindrical member 21 and the core cut 31d is approximately several mm to several tens of mm. At the position where such a core cut 31d is formed, fixing of the inner peripheral surface of the cylindrical member 21 and the outer peripheral surface of the stator 31 by the fixing method described above is excluded.

  The rotor 32 is a cylindrical member, and includes a rotor core 32a and a plurality of magnets 32b embedded in the rotor core 32a. The rotor core 32a is made of, for example, laminated electromagnetic steel plates. The drive shaft 40 is inserted into the central hole of the rotor core 32a. The plurality of magnets 32b are arranged at equally spaced center angles in the circumferential direction of the rotor core 32a. The rotor 32 is arranged inside the stator 31 formed in an annular shape with a slight gap from the stator 31. The rotor 32 rotates in response to a magnetic force generated by a current flowing through the winding 31b wound around the stator 31. When the rotor 32 rotates, the drive shaft 40 rotates, and the driving force is transmitted from the motor 30 to the compression mechanism 50 via the drive shaft 40.

(3-3) Drive shaft The drive shaft 40 is a member disposed in the casing 20 and extending in the vertical direction. The upper part of the drive shaft 40 is connected to the rotor 32 of the motor 30. A lower portion of the drive shaft 40 is connected to the compression mechanism 50. Further, the drive shaft 40 has an eccentric portion 41 that is eccentric with respect to the axis O of the drive shaft 40. The eccentric part 41 is connected to the piston 61. The piston 61 is disposed in a space surrounded by a cylinder hole 51d of a cylinder 51 of the compression mechanism 50 described later. The eccentric portion 41 is fitted in the cylindrical piston 61 in a state where the force of the motor 30 can be transmitted.

  The drive shaft 40 is rotatably supported by an upper bearing portion 52a of the front head 52 and a lower bearing portion 53a of the rear head 53 of the compression mechanism 50 described later. The drive shaft 40 rotates around the axis O when the motor 30 is driven. And the eccentric part 41 rotates eccentrically with respect to the shaft center O, and makes the piston 61 of the compression mechanism 50 revolve.

  An oil pump 42 for sucking the refrigerating machine oil L in the oil reservoir space 25 is fixed to the lower end portion of the drive shaft 40. An oil supply passage 43 through which the refrigerating machine oil L sucked by the oil pump 42 flows is formed inside the drive shaft 40 (see FIG. 2). The oil supply passage 43 has a main oil supply passage 43 a extending in the vertical direction along the drive shaft 40. The oil supply passage 43 has a plurality of sub oil supply passages (not shown) extending from the main oil supply passage 43a to the outer side in the radial direction of the drive shaft 40. The auxiliary oil supply passage opens to the side surface of the drive shaft 40 in the vicinity of the lower end of the upper bearing portion 52a, in the vicinity of the upper end of the lower bearing portion 53a, and in the eccentric portion 41, and forms a plurality of oil supply ports 43b. Refrigerating machine oil L sucked by the oil pump 42 from the oil reservoir space 25 passes through the main oil supply passage 43a and the auxiliary oil supply passage, and is supplied from the oil supply port 43b to the sliding portions of the drive shaft 40 and the piston 61. .

(3-4) Compression Mechanism The compression mechanism 50 includes a cylinder 51, a front head 52, and a rear head 53, as shown in FIG.

  The compression mechanism 50 is a mechanism that compresses the refrigerant sucked through the suction pipe 23. The compression mechanism 50 is arrange | positioned under the motor 30, as shown in FIG. The compression mechanism 50 mainly includes a cylinder 51, a front head 52, a rear head 53, a piston 61, a blade 62, and a bush 63 (see FIGS. 2, 4, and 5). Here, the piston 61 and the blade 62 are integrally formed. Specifically, the blade 62 is formed extending from the outer peripheral surface 61 a of the cylindrical piston 61.

(3-4-1) Cylinder The cylinder 51 is a member into which the refrigerant flows. The cylinder 51 is disposed inside the casing 20 so that the axial direction extends in the vertical direction. The upper and lower ends of the cylinder 51 are open, and a cylindrical cylinder hole 51d (a hollow portion of the cylindrical cylinder 51) is formed inside. The piston 61 is accommodated in the cylinder hole 51d.

  A bush holding hole 51a into which the bush 63 is rotatably inserted and an oil supply hole 51b communicating with the bush holding hole 51a are formed on the outer peripheral side of the cylinder hole 51d of the cylinder 51 (see FIG. 5). Further, a suction passage 51c communicating with the cylinder hole 51d is formed in the cylinder 51 (see FIG. 5).

  Into the bush holding hole 51a and the oil supply hole 51b, the blade 62 supported so as to be swingable by the bush 63 disposed in the bush holding hole 51a enters and exits according to the eccentric rotation of the piston 61 described later. The oil supply hole 51b includes an oil supply communication hole 53b formed in a rear head 53 that closes an opening below the cylinder 51, which will be described later, and an oil whose upper end is connected to the oil supply communication hole 53b and whose lower end is disposed in the oil reservoir space 25. The oil reservoir space 25 communicates with a flow path 54 a formed inside the pickup 54. The refrigerating machine oil L in the oil reservoir space 25 is sucked up to the oil supply hole 51b due to the pressure difference and used for lubrication of the sliding portion.

  The suction passage 51c is formed through the cylinder 51 along the radial direction from the outer peripheral surface of the cylinder 51 to the cylinder hole 51d. Thus, the suction passage 51c communicates with the cylinder hole 51d. The distal end portion of the suction pipe 23 is inserted into the suction passage 51c. Then, the refrigerant is guided from the suction pipe 23 to the compression chamber C1 formed in the cylinder hole 51d through the suction passage 51c.

(3-4-2) Front Head The front head 52 is disposed above the cylinder 51 as shown in FIG. The front head 52 closes the opening above the cylinder 51. That is, the front head 52 closes the opening above the cylinder hole 51 d of the cylindrical cylinder 51. The front head 52 includes a top of a compression chamber C1 formed between the inner peripheral surface 51da of the cylinder 51 (the surface surrounding the cylinder hole 51d) and the outer peripheral surface 61a of the piston 61 disposed in the cylinder hole 51d. Form a surface. The front head 52 has a discharge passage (not shown) communicating with the compression chamber C1, and the refrigerant compressed in the compression chamber C1 flows out of the compression chamber C1 through the discharge passage.

  A cylindrical upper bearing portion 52 a that rotatably supports the drive shaft 40 is formed on the upper portion of the front head 52.

  The front head 52 has a fixing portion 52 x along the inner peripheral surface of the cylindrical member 21 and is fixed in a state of being in close contact with the inner peripheral surface of the cylindrical member 21. The inner peripheral surface of the cylindrical member 21 and the front head 52 are fixed by press-fitting and partial welding. Here, the cylindrical member 21 and the front head are welded by a plurality of welds 52b. For example, three welding parts 52b are provided. As an example, the gap between the inner peripheral surface of the cylindrical member 21 and the front head 52 is 0.00 to 0.10 mm.

(3-4-3) Rear Head The rear head 53 is disposed below the cylinder 51. The rear head 53 closes the opening below the cylinder 51. That is, the opening below the cylinder hole 51d of the cylindrical cylinder 51 is closed. The rear head 53 forms a bottom surface of the compression chamber C1 formed between the inner peripheral surface 51da of the cylinder 51 and the outer peripheral surface 61a of the piston 61 disposed in the cylinder hole 51d.

  A cylindrical lower bearing portion 53 a that rotatably supports the drive shaft 40 is formed below the rear head 53.

  The rear head 53 is formed with an oil supply communication hole 53 b that communicates with a space surrounded by the oil supply hole 51 b of the cylinder 51. The oil supply communication hole 53b penetrates the rear head 53 in the vertical direction. The oil supply communication hole 53 b communicates with a flow path 54 a formed in the oil pickup 54 attached to the lower portion of the rear head 53. The lower end of the oil pickup 54 is disposed in the oil reservoir space 25. The refrigerating machine oil L in the oil reservoir space 25 is supplied into the oil supply hole 51b through the flow path 54a and the oil supply communication hole 53b due to a pressure difference.

(3-4-4) Piston The piston 61 is a member formed in a cylindrical shape. The piston 61 is formed integrally with the blade 62 (see FIG. 5). The eccentric portion 41 of the drive shaft 40 is fitted into the piston 61 (see FIG. 2).

  The piston 61 together with the cylinder 51, the front head 52, and the rear head 53 forms a compression chamber C1. The compression chamber C1 is a space surrounded by the outer peripheral surface 61a of the piston 61, the inner peripheral surface 51da of the cylinder 51, the lower surface of the front head 52, and the upper surface of the rear head 53. When the drive shaft 40 rotates, the piston 61 performs an eccentric rotational movement along the inner peripheral surface 51da of the cylinder 51 in the cylinder hole 51d (revolves along the cylinder hole 51d of the cylinder 51), and the suction of the cylinder 51 The refrigerant sucked into the compression chamber C1 through the passage 51c is compressed.

(3-4-5) Blade The blade 62 is a member that partitions the compression chamber C1 into a low pressure chamber C1a and a high pressure chamber C1b. The blade 62 is a plate-like member and is formed integrally with the piston 61. Specifically, the blade 62 is formed so as to extend from the outer peripheral surface 61 a of the cylindrical piston 61 toward the radially outer side.

  The blade 62 is sandwiched between a pair of bushes 63 disposed in the bush holding hole 51 a of the cylinder 51, and is supported by the bush 63 so as to be swingable. When the drive shaft 40 rotates, the blade 62 supported by the bush 63 swings, and enters and exits the bush holding hole 51a and the oil supply hole 51b according to the eccentric rotation of the piston 61. Further, the rotation of the piston 61 is restricted by the blade 62.

(3-4-6) Bushing The compression mechanism 50 has a pair of bushes 63 (see FIG. 5). Each bush 63 is a member having a semi-cylindrical shape (a shape obtained by dividing a column into two along the axial direction). The bush 63 is disposed in the bush holding hole 51a. The pair of bushes 63 sandwich the blade 62 therebetween, and support the blade 62 so as to be swingable.

(4) Manufacture of rotary compressor The rotary compressor 100 mentioned above is manufactured as follows.

  First, the compression mechanism 50 is disposed inside the cylindrical member 21 of the casing 20. At this time, the compression mechanism 50 is press-fitted in a state of being in close contact with the inner peripheral surface of the cylindrical member 21 of the casing 20. Further, the fixed portion 52x of the front head 52 of the compression mechanism 50 is welded to the cylindrical member 21 through the welded portion 52b. Here, for each different height, three welds 52b provided at a central angle of 120 ° are brought into close contact with each other by welding simultaneously with a welding device. A gap of 0.00 to 0.10 mm exists between the inner peripheral surface of the cylindrical member 21 of the casing 20 and the compression mechanism 50. Thereby, adhesion (thermal distortion etc.) is realizable through the above-mentioned press-fitting and welding process.

  Next, after fixing the compression mechanism 50 to the casing 20, the motor 30 is disposed in the casing 20. At this time, the position of the motor 30 is moved to adjust the axis of the drive shaft 40.

  Then, after the axis of the drive shaft 40 is adjusted, the motor 30 is fixed to the cylindrical member 21 of the casing by any one of welding, caulking, and adhesive, or any combination thereof.

  A gap of 0.15 to 0.30 mm exists between the inner peripheral surface of the cylindrical member 21 of the casing 20 and the motor 30. In short, the clearance between the inner peripheral surface of the cylindrical member 21 and the motor 30 is set wider than the clearance between the inner peripheral surface of the cylindrical member 21 and the compression mechanism 50. The shaft center of the compression mechanism 50 and the drive shaft 40 can be adjusted after the compression mechanism 50 is brought into close contact with the inner peripheral surface of the cylindrical member 21 by shrinkage due to welding or the like.

(5) Operation of Rotary Compressor The above-described rotary compressor 100 operates as follows.

  First, the motor 30 is activated. Thereby, the rotor 32 rotates with respect to the stator 31, and the drive shaft 40 fixed to the rotor 32 rotates. When the drive shaft 40 rotates, the eccentric portion 41 of the drive shaft 40 rotates eccentrically. Then, the piston 61 in which the eccentric portion 41 is fitted is revolved along the cylinder hole 51 d of the cylinder 51. At this time, the rotation of the piston 61 is regulated by a blade 62 formed integrally with the piston 61.

  Next, the rotation starts from the state where the piston 61 is at the top dead center. Then, the refrigerant suction process from the suction passage 51c to the low pressure chamber C1a is started. When the rotation angle of the drive shaft 40 increases, the volume of the low pressure chamber C1a increases, and the amount of refrigerant sucked into the low pressure chamber C1a increases. Then, when the piston 61 rotates to the top dead center, the refrigerant is closed in the low pressure chamber C1a.

  Subsequently, the low pressure chamber C1a connected to the suction passage 51c shifts to a high pressure chamber C1b connected to a discharge passage (not shown) formed in the front head 52. When the rotation angle of the piston 61 increases, the volume of the high pressure chamber C1b decreases. Along with this, the pressure in the high pressure chamber C1b increases. When the pressure in the high pressure chamber C1b exceeds a predetermined pressure, a discharge valve (not shown) provided in the discharge passage is opened. Thereafter, the refrigerant in the high pressure chamber C1b is discharged into the internal space of the casing 20 through the discharge passage. Then, the compressed refrigerant is discharged to the outside of the rotary compressor 100 through the discharge pipe 24. The discharge stroke of the refrigerant continues until the rotation angle of the piston 61 reaches 360 degrees.

  In the rotary compressor 100, the suction stroke and the discharge stroke described above are repeated, and the refrigerant suction / compression operation is continuously performed.

  In addition, since the refrigerant | coolant compressed in the compression mechanism 50 is discharged, the internal space of the casing 20 becomes a high voltage | pressure. Thereby, the high-pressure refrigerating machine oil L in the oil reservoir space 25 is supplied to the compression mechanism 50 through the oil pump 42 and the oil supply passage 43 provided at the lower end portion of the drive shaft 40.

(6) Features (6-1)
As described above, the rotary compressor 100 according to the present embodiment includes the casing 20, the drive shaft 40, the motor (drive mechanism) 30, and the compression mechanism 50. The casing 20 has a cylindrical member 21. The drive shaft 40 is disposed in the casing 20. The motor 30 is connected to the drive shaft 40 and drives the drive shaft 40. The compression mechanism 50 is driven by the motor 30 via the drive shaft 40 and compresses the refrigerant. Further, the compression mechanism 50 has a fixing portion 52 x that comes in contact with the inner peripheral surface of the cylindrical member 21, and is fixed in a state of being in close contact with the inner peripheral surface of the cylindrical member 21. The motor 30 is fixed to the inner peripheral surface of the cylindrical member 21 with a gap.

  Thereby, in the rotary compressor 100, since the compression mechanism 50 is fixed in the state closely_contact | adhered to the internal peripheral surface of the cylindrical member 21, the rigidity in the fixed position of the compression mechanism 50 can be improved. As a result, transmission of vibration from the compression mechanism 50 to the casing 20 can be suppressed, and radiated sound generated in the rotary compressor 100 can be reduced. Further, since the motor 30 is fixed to the inner peripheral surface of the cylindrical member 22 with a gap, the centering of the drive shaft 40 can be easily adjusted with respect to the compression mechanism 50.

  The inner peripheral surface of the cylindrical member 21 and the compression mechanism 50 are fixed by press-fitting and partial welding. As an example, the gap between the inner peripheral surface of the cylindrical member 21 and the compression mechanism 50 is 0.00 to 0.10 mm.

  Here, the compression mechanism 50 includes a cylinder 51 into which refrigerant flows, a front head 52 disposed above the cylinder 51, and a rear head 53 disposed below the cylinder 51. The front head 52 has a fixing portion 52 x along the inner peripheral surface of the cylindrical member 21 and is fixed in a state of being in close contact with the inner peripheral surface of the cylindrical member 21. Thereby, the rigidity in the fixed position of the compression mechanism 50 can be improved.

(6-2)
In the rotary compressor 100 according to the present embodiment, the motor 30 includes a rotor 32 that is fixed to the drive shaft 40 and a stator 31 that is disposed outside the rotor 32 and drives the rotor 32. The stator 31 is fixed to the inner peripheral surface of the cylindrical member 21 with a gap. Thereby, the centering of the drive shaft 40 can be easily adjusted with respect to the compression mechanism 50. As an example, the gap between the inner peripheral surface of the cylindrical member 21 and the motor 30 is 0.15 to 0.30 mm. Therefore, the centering of the drive shaft with respect to the compression mechanism can be adjusted within a predetermined range.

  Moreover, the inner peripheral surface of the cylindrical member 21 and the motor 30 are fixed by any one of welding, caulking, and an adhesive, or any combination thereof. Therefore, the motor 30 can be fixed to the inner peripheral surface of the cylindrical member 21 while adjusting the centering of the drive shaft 40 with respect to the compression mechanism 50.

(6-3)
Moreover, the method of manufacturing the rotary compressor 100 according to the present embodiment includes a step of fixing the compression mechanism 50 by press-fitting and partial welding so as to be in close contact with the inner peripheral surface of the cylindrical member 21 of the casing 20, and compression. After fixing the mechanism 50 to the casing 20, the step of arranging the motor 30 in the casing 20, the step of moving the position of the motor 30 to adjust the axis of the drive shaft 40, and the axis of the drive shaft 40 After the adjustment, the motor 30 is fixed by welding, caulking, and any one of adhesives or any combination thereof.

  According to this method, since the compression mechanism 50 is fixed to the inner peripheral surface of the cylindrical member 21 of the casing 20 in close contact with the entire circumference by press-fitting and partial welding, a rotary that can reduce radiated sound. The compressor 100 can be manufactured.

  Supplementally, conventionally, as shown in FIG. 7A, the rotary compressor 100 is assembled by shrink-fitting the stator 31 of the motor 30 and then welding the compression mechanism 50. On the other hand, in the present embodiment, as shown in FIG. 7B, after the press-fitted compression mechanism 50 is welded or shrink-fitted, or welded and shrink-fitted, the stator 31 fitted with a gap is fitted. The rotary compressor 100 is assembled by welding. Thus, after fixing the compression mechanism 50, the shaft center of the drive shaft 40 is adjusted, and then the motor 30 is fixed. Therefore, the centering of the drive shaft 40 with respect to the compression mechanism 50 can be easily adjusted.

(7) Modification Examples of the present embodiment are shown below. Each modified example may be appropriately combined with other modified examples within a consistent range.

(7-1) Modification A
In the present embodiment, the front head 52 is fixed in a state of being in close contact with the inner peripheral surface of the cylindrical member 21, but is not limited thereto. That is, at least one of the cylinder 51, the front head 52, and the rear head 53 has a fixing portion along the inner peripheral surface of the cylindrical member 21 and is fixed in a state of being in close contact with the inner peripheral surface of the cylindrical member 21. I just need it. For example, the fixed portion 51 x of the cylinder 51 shown in FIG. 5 is formed according to the shape of the inner peripheral surface of the cylindrical member 21. Such a shape also has the effect of increasing the rigidity of the compression mechanism 50 at the fixed position.

(7-2) Modification B
In the present embodiment, the inner peripheral surface of the cylindrical member 21 and the compression mechanism 50 may be fixed by shrink fitting. Thereby, the compression mechanism 50 is fixed to the inner peripheral surface of the cylindrical member 21 in a state of further contact.

(7-3) Modification C
In the above embodiment, the rotary compressor 100 is a one-cylinder rotary compressor, but is not limited to this. The rotary compressor may be of a multi-cylinder type (for example, two cylinders). The rotary compressor may have a structure in which an intermediate pressure refrigerant is injected into the compression chamber C1.

(7-4) Modification D
The rotary compressor 100 of the above embodiment is a compressor in which the piston 61 and the blade 62 are integrated. Good.

20 Casing 21 Cylindrical member 30 Motor (drive mechanism)
31 Stator 32 Rotor 40 Drive shaft 50 Compression mechanism 51 Cylinder 52 Front head 52x Fixed portion 53 Rear head 100 Rotary compressor

Japanese Patent Laying-Open No. 2015-197046

Claims (10)

A casing (20) having a cylindrical member (21);
A drive shaft (40) disposed within the casing;
A drive mechanism (30) coupled to the drive shaft and driving the drive shaft;
A compression mechanism (50) driven by the drive mechanism via the drive shaft to compress the refrigerant;
A rotary compressor (100) comprising:
The compression mechanism has a fixing portion (52x) that contacts along the inner peripheral surface of the cylindrical member, and is fixed in a state of being in close contact with the inner peripheral surface of the cylindrical member,
The drive mechanism is fixed to the inner peripheral surface of the cylindrical member with a gap.
Rotary compressor. The compression mechanism is
A cylinder (51) into which the refrigerant flows;
A front head (52) disposed above the cylinder;
A rear head (53) disposed below the cylinder,
At least one of the cylinder, the front head, and the rear head has the fixing portion along the inner peripheral surface of the cylindrical member, and is fixed in a state of being in close contact with the inner peripheral surface of the cylindrical member.
The rotary compressor according to claim 1. The drive mechanism is
A rotor (32) fixed to the drive shaft;
A stator (31) disposed outside the rotor and driving the rotor,
The stator is fixed to the inner peripheral surface of the cylindrical member with a gap.
The rotary compressor according to claim 1 or 2. The gap between the inner peripheral surface of the cylindrical member and the drive mechanism is 0.15 to 0.30 mm.
The rotary compressor of any one of Claim 1 to 3. The gap between the inner peripheral surface of the cylindrical member and the compression mechanism is 0.00 to 0.10 mm.
The rotary compressor of any one of Claim 1 to 4. The inner peripheral surface of the cylindrical member and the drive mechanism are fixed by welding, caulking, or an adhesive, or are fixed by welding and an adhesive or caulking and an adhesive,
The rotary compressor according to any one of claims 1 to 5. The inner peripheral surface of the cylindrical member and the compression mechanism are fixed by press-fitting and partial welding.
The rotary compressor of any one of Claim 1 to 6. The inner peripheral surface of the cylindrical member and the compression mechanism are fixed by shrink fitting.
The rotary compressor of any one of Claim 1 to 7. A method for manufacturing the rotary compressor according to claim 7, comprising:
Fixing the compression mechanism by press-fitting and partial welding so as to be in close contact with the inner peripheral surface of the cylindrical member of the casing;
After fixing the compression mechanism to the casing, disposing the drive mechanism in the casing;
Moving the position of the drive mechanism to adjust the axis of the drive shaft;
After adjusting the axis of the drive shaft, fixing the drive mechanism by welding, caulking, and any one or any combination thereof; and
A method comprising: The fixing step further comprises a step of shrink fitting the compression mechanism into the casing;
The method of claim 9.

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