JP6026729B2 - Compressor and refrigeration cycle apparatus - Google Patents

Description

  Embodiments described herein relate generally to a compressor and a refrigeration cycle apparatus including the compressor.

As a general compressor, a hermetic compressor having a compression mechanism portion connected by a rotating shaft and an electric motor portion in a hermetic case is known. The compression mechanism has a cylinder and a bearing, and is fixed to the inner wall surface of the sealed case. Further, the electric motor unit has a rotor fixed to the rotating shaft and a stator fixed to the inner wall surface of the sealed case.
In such a compressor, generally, a method is employed in which the sealed case is heated and the stator of the electric motor section is fixed to the inner wall surface of the sealed case by shrink fitting.

  Further, some compressors are known in which the stator of the electric motor unit is not directly fixed to the inner wall surface of the sealed case but is fixed to the compression mechanism unit fixed to the inner wall surface of the sealed case.

JP 2004-245067 A

However, if the stator is fixed in the hermetic case by shrink fitting as described above, the stator and the compression mechanism will be heated, so that assembly accuracy control by thermal deformation and securing of heating / cooling time will be ensured. In addition, the cost in the manufacturing process increases.
Further, in a compressor in which the stator of the motor unit is fixed to the compression mechanism unit, a force caused by the reaction force between the stator and the rotor generated when the motor unit is driven is applied to the compression mechanism unit. There is a problem that the performance deteriorates due to deflection or distortion.
Embodiments of the present invention make it possible to provide a compressor that is less expensive and does not suffer performance degradation.

A compressor according to an embodiment of the present invention is fitted in a sealed case, a rotating shaft, a compression mechanism provided at one end of the rotating shaft, and disposed below the sealed case, and the other end of the rotating shaft. a rotor engaged, Ri Do from the stator which is provided so as to cover the outer periphery of the rotor, and a motor unit disposed above in the closed case. Furthermore, the stator of the electric motor part is fixed to the lower surface of the fixing support member fixed to the hermetic case above the electric motor part . Further, a gap is provided between the inner wall surface of the hermetic case and the outer peripheral surface of the stator.

The longitudinal cross-sectional view of the compressor which concerns on 1st Embodiment. The longitudinal cross-sectional view of the compressor which concerns on 2nd Embodiment. The schematic diagram of the refrigerating cycle device concerning a 3rd embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(First embodiment)
FIG. 1 shows a longitudinal sectional view of a compressor 100 of the present embodiment.
The compressor 100 according to the first embodiment is a hermetic rotary compressor that compresses a refrigerant, and is disposed inside a vertically long cylindrical sealed case 1 and above a compression mechanism section 2. An electric motor unit 3 is provided. The sealed case 1 includes a main body 1a having an upper end opened and a lid 1b for closing the upper end opening of the main body 1a. The compression mechanism unit 2 and the electric motor unit 3 are connected by a rotation shaft 9, and the rotational power generated by the electric motor unit 3 is transmitted to the compression mechanism unit 2 through the rotation shaft 9.

A cylinder 5 having a cylinder chamber 4 which is a substantially cylindrical inner diameter portion is provided in the compression mechanism portion 2 disposed on one end side of the rotary shaft 9 below the electric motor portion 3. The upper part of the cylinder 5 is closed by a main bearing 6 that supports the rotary shaft 9, and the lower part is closed by a sub-bearing 7.
The cylinder 5 is provided with a blade groove (not shown) communicating with the cylinder chamber 4. In the cylinder chamber 4, a shaft eccentric portion 8 provided in the middle portion of the rotating shaft 9 and a roller 10 fitted to the shaft eccentric portion 8 are arranged so as to be eccentrically rotatable. A substantially rectangular blade (not shown) is disposed in the blade groove so as to be reciprocally movable.

  When the shaft eccentric part 8 and the roller 10 rotate eccentrically, the tip end surface of the blade reciprocates in the blade groove with the eccentric rotation of the roller 10 while being in contact with the outer peripheral surface 10 a of the roller 10. Thereby, the inside of the cylinder chamber 4 is divided into a low pressure suction side and a high pressure discharge side.

On the suction side of the cylinder chamber 4, there is provided a suction port 12 for sucking refrigerant from outside the sealed case 1, and this suction port 12 communicates with a gas-liquid separator 24 provided outside the sealed case 1. Yes. The main bearing portion 6 is provided with a discharge passage 13, which is closed by a discharge valve 14 that can be opened and closed only in the discharge direction. Furthermore, a discharge muffler 15 is provided on the upper portion of the main bearing portion 6 to cover the discharge passage.
A lubricating oil 31 is stored below the sealed case 1 and is supplied to the sliding surfaces of the cylinder chamber 4, the main bearing portion 6, and the auxiliary bearing 7 in the compression mechanism portion 2. .

The electric motor unit 3 provided above the compression mechanism unit 2 includes a rotor 17 fitted to the rotary shaft 9 and a stator 16 provided so as to cover the outer periphery of the rotor 17.
A fixed support member 18 on a substantially disk is provided on the upper portion of the electric motor unit 3 on the side opposite to the compression mechanism. The fixed support member 18 is fixed to the inner wall surface of the sealed case 1 by pressure fitting, and the stator 16 of the electric motor unit 3 is fixed to the fixed support member 18 by a plurality of bolts 19. The outer peripheral diameter of the stator 16 is formed smaller than the inner peripheral diameter of the main body 1 a of the sealed case 1, and a gap is provided between the inner wall surface of the main body 1 a and the outer peripheral surface of the stator 16. Yes.
Further, a circular hole 18 a having an inner diameter dimension Di larger than the inner diameter dimension Do of the stator 16 is provided in the center of the fixed support member 18.

(Production method)
The compressor 100 is assembled as follows.
A cylinder 5 is provided at one end of the rotary shaft 9, a roller 10 and a shaft eccentric portion 8 are fitted in the cylinder chamber 4, and the cylinder chamber 4 is closed by the main bearing 6 and the sub-bearing 7 to constitute the compression mechanism portion 2. Then, the rotor 17 is fixed to the other end side of the rotating shaft 9. After magnetizing the rotor 7, it is inserted into the main body part 1a of the sealed case 1 from the compression mechanism part 2 side, and the outer peripheral surface of the cylinder 5 is fixed to the lower inner wall surface of the main body part 1a by arc spot welding. Let Here, the rotor 17 is mounted with a gap gauge made of a flat plate having a uniform thickness and arranged so as to cover the periphery of the rotor 17. The thickness of the gap gauge is substantially the same as the gap between the outer peripheral surface of the rotor 17 and the inner peripheral surface of the stator 16.

Next, the fixing support member 18 is fixed to the upper portion of the stator 16 with the bolts 19. A substantially cylindrical sleeve 21 is provided between the stator 16 and the fixed support member 18, and the bolt 19 passes through the bolt hole of the stator 16 and the inner diameter of the sleeve 21, and passes through the fixed support member 18. It is concluded.
Then, the stator 16 is inserted into the main body 1a of the sealed case 1 so that the rotor 17 and the gap gauge are inserted into the inner diameter portion of the stator 16, and the fixed support member 18 is press-fitted by a press machine or the like. .

  And the opening part of the main-body part 1a is obstruct | occluded by the cover part 1b, and the main-body part 1a and the cover part 1b are joined by arc welding.

As described above, the compression mechanism portion 2 is fixed to the inner wall surface of the sealed case 1, and the fixing support member 18 provided on the anti-compression mechanism portion side of the electric motor portion 3 is press-fitted into the sealed case 1 and fixed. By using the compressor 1, the amount of heat input to the motor unit 3 and the compression mechanism unit 2 is reduced as compared with the case where the stator 16 of the motor unit 3 is directly fixed to the inner wall surface of the sealed case 1 by shrink fitting. be able to. For this reason, there is little error in dimensional accuracy due to thermal deformation, the clearance can be easily managed, and the highly reliable compressor 100 can be easily obtained. In particular, even when the compressor 100 is downsized, a compressor with high reliability can be obtained by reducing the influence of heat input.
Furthermore, by fastening the electric motor unit 3 and the fixed support member 18 with the bolts 19, torque management can be easily performed, dimensional errors due to deformation due to the fastening torque can be reduced, and more reliable. The compressor 100 can be obtained.

  In addition, the stator 16 of the motor unit 3 and the compression mechanism unit 2 are separately fixed to the hermetic case 1, so that the bearing due to the reaction force between the stator 16 and the rotor 17 generated when the motor unit 3 is driven. Therefore, the compressor 100 with higher reliability can be obtained.

Since a gap is provided between the inner wall surface of the hermetic case 1 and the outer peripheral surface of the stator 16, the lubricating oil lifted above the stator 16 and the fixed support member 18 during the operation of the compressor 1. However, it can flow to the compression mechanism part side rapidly, suppress the oil level fall of the compression mechanism part 2, and can suppress the reliability fall by insufficient lubrication.
Further, since the inner diameter dimension Di of the circular hole 18a is larger than the inner diameter dimension Do of the stator 16, the stator 16 can be fitted with the gap gauge attached to the rotor 17, and the fixed support member 18 can be attached. After being fixed to the inner wall surface of the sealed case 1, the gap gauge can be easily removed. Thereby, the electric motor part 3 which has high fitting precision can be obtained easily.

(Second Embodiment)
Next, a second embodiment will be described with reference to FIG. In addition, about the compressor 100B of 2nd Embodiment, the code | symbol same about the structure same as the compressor 100 of 1st Embodiment is attached | subjected, and description is abbreviate | omitted.
The compressor 100B of the second embodiment has a fixed support member 30 formed of a flat sheet metal. The fixed support member 30 is formed in a flat plate shape having a diameter larger than the outer peripheral diameter of the sealed case 1, and is disposed so as to cover the opening of the main body 1 a of the sealed case 1. Further, a lid 1b is provided and fixed to the upper portion of the fixed support member 30.
The main body 1a and the fixed support member 30, and the fixed support member 30 and the lid 1b are fixed to each other by butt resistance welding.
Furthermore, a leg portion 23 for fixing the compressor 100B to a refrigeration cycle apparatus or the like and a holding portion 25 for fixing the gas-liquid separator 24 are provided on a portion of the fixed support member 30 located outside the sealed case 1. Is provided.

Furthermore, a circular hole 30a having a diameter Di is provided in the center of the fixed support member 30, and an oil discharge preventing plate 29 having an opening 28 in the center is fitted in the circular hole 30a.
A mortar-shaped oil discharge disc 26 is provided at the upper end of the rotating shaft 9 and is disposed below the oil discharge prevention plate 29 described above. The diameter of the oil discharge separation disk 26 is smaller than the outer diameter of the rotor 16 so that a gap gauge can be attached to the rotor 17 even after the oil discharge separation disk 26 is attached to the rotor 17. It has become.
The opening 28 is formed in a substantially tubular shape extending to the motor unit side, and the mixed fluid of the gas refrigerant and the lubricating oil discharged to the upper side of the oil discharge prevention plate 29 is separated to reduce the discharge amount of the lubricating oil. be able to.

(Production method)
The compressor 100B is assembled as follows.
Similar to the compressor 100 of the first embodiment, the compression mechanism unit 2 is provided on one end side of the rotary shaft 9 and the rotor 17 is provided on the other end side. Further, an oil discharge separating disk 26 is provided on the anti-compression mechanism portion side of the rotor 17, and a gap gauge is attached to the outer peripheral surface of the rotor 17.
And after magnetizing the rotor 7, it inserts in the main-body part 1a of the airtight case 1 from the compression mechanism part 2 side, and the arc spot welding of the outer peripheral surface of the cylinder 5 to the lower inner wall face of the main-body part 1a is carried out. To fix.

Next, the fixing support member 30 is fixed to the upper portion of the stator 16 by the rivet 20. A substantially cylindrical sleeve 21 is provided between the stator 16 and the fixed support member 30, and the rivet 20 passes through the rivet hole of the stator 16 and the inner diameter of the sleeve 21, and is attached to the fixed support member 30. It is concluded.
Then, the stator 16 is inserted into the main body 1a of the hermetic case 1 so that the rotor 17 and the gap gauge are located on the inner diameter portion of the stator 16, and the lower surface of the fixed support member 30 and the opening of the main body 1a. Are fixed by butt resistance welding.

  Then, the cap gauge is removed from the circular hole 30a of the fixed support member 30, and the oil discharge preventing plate 29 is fitted into the circular hole 30a and fixed. Thereafter, the lid 1b is overlaid on the upper surface of the fixed support member 30 and joined by butt resistance welding.

As described above, the compression mechanism portion 2 is fixed to the inner wall surface of the sealed case 1, the fixed support member 18 provided on the side opposite to the compression mechanism portion of the motor portion 3 is butt-welded to the sealed case 1, and the motor portion 3 is Compared to the case where the stator 16 of the electric motor unit 3 is directly fixed to the inner wall surface of the sealed case 1 by shrink fitting, the electric motor unit 3 and the compression mechanism unit 2 are provided. The amount of heat input can be reduced. For this reason, there is little change in dimensional accuracy due to thermal deformation, the clearance can be easily managed, and a highly reliable compressor 100B can be easily obtained. In particular, even when the compressor 100B is downsized, a compressor with high reliability can be obtained by reducing the influence of heat input.
Further, by forming the fixed support member 30 with a sheet metal, the compressor 100B that is easy to process and inexpensive can be obtained.
Furthermore, by fastening the electric motor unit 3 and the fixed support member 30 with the rivet 20, it is possible to perform a light and inexpensive fastening, and to obtain an inexpensive compressor 100.

  Further, by providing the oil discharge separation disk 26 and the oil discharge prevention plate 29 above the motor unit 3, the lubricating oil contained in the refrigerant gas discharged from the compression mechanism unit 2 is separated and discharged to the outside of the compressor 100B. The amount of lubricating oil to be reduced can be reduced. Thereby, lack of lubricating oil is prevented and it can be set as the reliable compressor 100B by maintaining favorable lubrication performance.

  In addition, the fixed support member 30 also serves as the leg portion 23 of the compressor 100B and the holding member of the gas-liquid separator 24, thereby reducing the number of welded parts, the number of parts, and simplifying the assembly process. Therefore, an inexpensive compressor 100B can be obtained.

  In addition, since the stator 16 of the electric motor unit 3 and the compression mechanism unit 2 are separately fixed to the sealed case 1, the force generated by the reaction force between the stator 16 and the rotor 17 generated when the electric motor unit 3 is driven. Therefore, the compressor 100 with higher reliability can be obtained.

  Since a gap is provided between the inner wall surface of the sealed case 1 and the outer peripheral surface of the stator 16, even when the compressor 1 is in operation, it is lifted above the stator 16 and the fixed support member 18. The lubricating oil quickly flows to the compression mechanism portion side, the oil level of the compression mechanism portion 2 is prevented from being lowered, and the reliability deterioration due to insufficient lubrication can be suppressed.

  Further, since the inner diameter dimension Di of the circular hole 18a is larger than the inner diameter dimension Do of the stator 16, the stator 16 can be fitted with the gap gauge attached to the rotor 17, and the fixed support member 18 can be attached. After being fixed to the inner wall surface of the sealed case 1, the gap gauge can be easily removed. Thereby, the electric motor part 3 which has high fitting precision can be obtained easily.

(Third embodiment)
FIG. 3 shows a schematic diagram of a refrigeration cycle apparatus according to the third embodiment, which will be described.
The refrigeration cycle apparatus A includes a four-way valve 101 connected to the compressor 100 (100B), a first heat exchanger 102, an expansion device 103, and a second heat exchanger 104. It is connected. In the refrigeration cycle apparatus 100, a refrigerant that is a working fluid is sealed.
The refrigerant compressed and discharged by the compressor 100 is supplied to the first heat exchanger 102 through the four-way valve 101 as indicated by a solid arrow. At this time, the first heat exchanger 102 functions as a condenser, and condenses while taking condensation heat from the refrigerant.
The working refrigerant condensed in the first heat exchanger 102 flows to the second heat exchanger 104 while being decompressed by the expansion device 103 via the refrigerant pipe. The second heat exchanger 104 functions as an evaporator and evaporates while taking heat of evaporation from the refrigerant. The evaporated working refrigerant is sucked into the compressor 100 via the refrigerant pipe and the four-way valve 101, the refrigerant circulates through the above path, and the operation of the refrigeration cycle apparatus A is continued.

  Further, when the flow path is switched by the four-way valve 101, the refrigerant circulates along a path indicated by a broken-line arrow in FIG. That is, the refrigerant discharged from the compressor 100 sequentially flows from the four-way valve 101 through the second heat exchanger 104, the expansion device 103, and the first heat exchanger 102, and is sucked into the compressor 100 through the four-way valve 101. It circulates through the route. At this time, the first heat exchanger 102 functions as an evaporator, and the second heat exchanger 104 functions as a condenser.

  As described above, a highly reliable refrigeration cycle apparatus can be provided by using the highly reliable compressor 100 for the refrigeration cycle apparatus A.

In addition, although the said 1st thru | or 3rd embodiment demonstrated the compressor with one cylinder of the compression mechanism part, you may use two or more compression mechanism parts. Further, an integrated cylinder in which the cylinder 5 and the main bearing 17 are integrally formed may be used.
In the above embodiment, the compressor having the rotary type compression mechanism unit in which the blade contacts the outer periphery of the roller rotating eccentrically in the cylinder chamber has been described. However, a scroll type compressor, a swing rotary type compression mechanism unit, or the like is used. May be.

  Further, the present invention is not limited to the above-described embodiments as they are, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Further, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiment. Some components may be deleted from all the components.

DESCRIPTION OF SYMBOLS 1 ... Sealing case, 2 ... Compression mechanism part, 3 ... Electric motor part, 4 ... Cylinder chamber, 5 ... Cylinder, 6 ... Main bearing, 7 ... Sub bearing, 8 ... Shaft eccentric part, 9 ... Rotary shaft, 10 ... Roller, DESCRIPTION OF SYMBOLS 10a ... Outer peripheral surface, 12 ... Suction port, 13 ... Discharge port, 14 ... Discharge valve apparatus, 15 ... Discharge muffler, 16 ... Stator, 17 ... Rotor, 18 (30) ... Fixed support member, 18a (30a) ... Round hole, 19 ... bolt, 20 ... rivet, 21 ... sleeve, 23 ... leg, 24 ... gas-liquid separator, 25 ... holding part, 26 ... oil discharge separation disk, 28 ... opening, 29 ... oil discharge prevention plate 31 ... Lubricating oil 100 (100B) ... Compressor, 101 ... Four-way valve, 102 ... First heat exchanger, 103 ... Expansion device, 104 ... Second heat exchanger, A ... Refrigeration cycle device

Claims (3)

In the sealed case,
A rotation axis;
A compression mechanism provided on one end of the rotating shaft and disposed below the sealed case ;
Wherein the mated rotor to the other end of the rotary shaft, and wherein Ri Do from the stator disposed so as to cover the outer periphery of the rotor, upwardly disposed a motor unit in said sealed casing,
With
The stator of the motor unit is fixed to the lower surface of a fixing support member fixed to the sealing case above the motor unit, and a gap is provided between the inner wall surface of the sealing case and the outer peripheral surface of the stator. A compressor characterized by that. The compressor according to claim 1, wherein a circular hole having a diameter larger than an inner diameter of the stator is provided at a center of the fixed support member.   A refrigeration cycle apparatus comprising the compressor according to claim 1.

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