Compressor having plurality of partition members, and refrigeration device

Abstract

A compressor (90) comprises a casing (10), a scroll compression mechanism (40), and a partition member (50). The casing (10) has an internal space (S). The scroll compression mechanism (40) is disposed in the internal space (S). The partition member (50) partitions the internal space (S). The partition member (50) has a first partition member (60) and a second partition member (70). The first partition member (60) is welded to the casing (10). The second partition member (70) supports the scroll compression mechanism (40).

Description

Compressor and refrigeration device having multiple partition members

[0001] The present disclosure relates to a compressor and a refrigeration device having a plurality of partition members.

[0002] The compressor disclosed in Patent Document 1 (Japanese Patent No. 7174287) includes a casing, a scroll compression mechanism, and a partition member that separates the interior space of the casing. The partition member is disposed so as to be in contact with the scroll compression mechanism. The partition member is fixed to the casing.

[0003] Generally, a partition member is required to have slidability (i.e., ease of sliding) relative to the scroll compression mechanism and to be firmly fixed to the casing. Regarding the firm fixation, for example, the partition member is required to be joinable to the casing by welding. However, a partition member made of such a joinable material does not necessarily exhibit good slidability.

[0004] A compressor according to a first aspect includes a casing having an internal space and a scroll compression mechanism disposed in the internal space.

[0005] The partition member divides the internal space. The partition member includes a first partition member and a second partition member. The first partition member is welded to the casing. The second partition member supports the scroll compression mechanism.

[0006] According to this configuration, the partition member has a second partition member and a first partition member, and the first partition member is welded to the casing. Therefore, the second partition member can be formed from a material that is not suitable for welding.

[0007] A compressor according to a second aspect is the compressor according to the first aspect, wherein the second partition member has higher slidability than the first partition member.

[0008] With this configuration, the second partition member has high slidability, and therefore there is little risk that the movement of the scroll compression mechanism will be hindered by friction with the second partition member.

[0009] A compressor according to a third aspect is the compressor according to the second aspect, wherein the carbon content of the second partition member is greater than the carbon content of the first partition member.

[0010] According to this configuration, the carbon content of the second partition member is high, and therefore the slidability of the second partition member can be improved.

[0011] A compressor according to a fourth aspect is the compressor according to the second or third aspect, wherein a storage space is formed between the second partition member and the first partition member. Lubricating oil is stored in the storage space.

[0012] According to this configuration, the lubricating oil is stored in the storage space, and therefore, it is easy to supply the lubricating oil to the scroll compression mechanism for lubrication.

[0013] A compressor according to a fifth aspect is the compressor according to any one of the first to fourth aspects, wherein the second partition member has a seal ring receiving portion having a circular ring shape. A seal ring is installed in the seal ring receiving portion. The scroll compression mechanism has an orbiting scroll. The seal ring contacts the orbiting scroll.

[0014] According to this configuration, the seal ring is disposed so as to come into contact with the scroll compression mechanism, thereby ensuring movement of the scroll compression mechanism and isolating high-pressure refrigerant from low-pressure refrigerant in the internal space of the casing.

[0015] A compressor according to a sixth aspect is the compressor according to the fifth aspect, wherein the first partition member holds a bearing. The first partition member has an annular elastic groove.

[0016] According to this configuration, the partition member has an elastic groove, which suppresses tilting of the rotation axis of the crankshaft and reduces the risk of the bearings being subjected to excessive pressure, thereby improving the reliability of the crankshaft and the bearings.

[0017] A compressor according to a seventh aspect is the compressor according to the sixth aspect, wherein the seal ring receiving portion has a second diameter, the elastic groove has a first diameter, the second diameter is larger than the first diameter, and the second diameter is smaller than 1.2 times the first diameter.

[0018] With this configuration, the area surrounded by the seal ring does not become excessively large, thereby reducing the force acting on the thrust surface of the scroll compression mechanism.

[0019] A compressor according to an eighth aspect is the compressor according to the sixth aspect, wherein the elastic groove has a first diameter, the seal ring receiving portion has a second diameter, and the second diameter is smaller than the first diameter.

[0020] With this configuration, the area surrounded by the seal ring is small because the first diameter is small. This reduces the force acting on the thrust surface of the scroll compression mechanism. In addition, because the first partition member is configured as a separate member from the second partition member, the second diameter can be set large despite the small first diameter. This allows the volume of lubricating oil stored in the storage space to be increased.

[0021] A compressor according to a ninth aspect is the compressor according to any one of the first to eighth aspects, wherein the second partition member is fixed to the casing by press fitting.

[0022] According to this configuration, the second partition member is fixed to the casing by press fitting, so there is no need to perform welding to fix the second partition member to the casing.

[0023] A compressor according to a tenth aspect is the compressor according to any one of the first to ninth aspects, wherein the second partition member has a convex portion, and the first partition member has a concave portion. The convex portion is press-fitted into the concave portion.

[0024] According to this configuration, the first partition member and the second partition member are firmly fixed to each other by press fitting. Therefore, even if the second partition member is made of a material that does not allow welding, the first partition member and the second partition member are stably fixed to each other.

[0025] A compressor according to an eleventh aspect is the compressor according to any one of the first to tenth aspects, wherein the scroll compression mechanism compresses a CO2 refrigerant.

[0026] According to this configuration, the CO2 refrigerant compressed by the scroll compression mechanism is used under relatively high pressure conditions, and therefore, the compressor of this configuration is suitable for use with CO2 refrigerant because it can easily withstand large forces acting on the thrust surface.

[0027] A compressor according to a twelfth aspect is the compressor according to any one of the first aspect to the eleventh aspect, wherein the second partition member is made of cast iron.

[0028] According to this configuration, the second partition member is made of cast iron, which reduces friction between the second partition member and the scroll compression mechanism.

[0029] A compressor according to a thirteenth aspect is the compressor according to any one of the first to twelfth aspects, wherein the first partition member is made of cast steel.

[0030] According to this configuration, the first partition member is made of cast steel, and therefore, the first partition member can be welded to the casing.

[0031] A compressor according to a fourteenth aspect is the compressor according to any one of the first aspect to the thirteenth aspect, wherein the first partition member is formed of cast iron that has been cast-inserted.

[0032] According to this configuration, the first partition member is made of cast iron that has been cast-inserted. Therefore, since iron is embedded in the outer periphery of the cast iron that is not suitable for welding, it is possible to weld the first partition member to the casing.

[0033] A compressor according to a fifteenth aspect is the compressor according to any one of the first aspect to the fourteenth aspect, wherein the first partition member is formed of cast iron with a weld pin press-fitted therein.

[0034] According to this configuration, the first partition member is made of cast iron with a weld pin pressed in. Therefore, since the weld pin is fixed to the cast iron, which is not suitable for welding, it is possible to weld the first partition member to the casing.

[0035] A refrigeration device according to a sixteenth aspect includes the compressor according to any one of the first to fifteenth aspects.

[0036] According to this configuration, the refrigeration device includes a compressor that can withstand high refrigerant pressure, and therefore the refrigeration device can use a refrigerant with a high operating pressure.

[0037] 1 is a schematic diagram showing a refrigerant circuit of a refrigeration device 100. FIG. 2 is a cross-sectional view of a compressor 90. FIG. 3 is an enlarged cross-sectional view of a compressor 90. FIG. 4 is a cross-sectional view of a second partition member 70 according to a modified example A. FIG. 5 is a cross-sectional view of a first partition member 60 according to a modified example C.

[0038] <Embodiment> (1) Overall Configuration Fig. 1 shows a refrigerant circuit of a refrigeration device 100 according to this embodiment. The refrigeration device 100 provides cold heat or hot heat to a user. Specific aspects of the refrigeration device 100 may include an air conditioner, a refrigerator, a freezer, a water heater, a floor heating device, and the like.

[0039] The refrigeration apparatus 100 is configured as a refrigerant circuit that circulates refrigerant R. The refrigerant R may be a CO2 refrigerant. The refrigeration apparatus 100 has a heat source unit 110, a utilization unit 120, and a communication piping group 130. The heat source unit 110 has a compressor 90, a four-way switching valve 91, a heat source heat exchanger 92, a heat source fan 93, a heat source expansion valve 94, a liquid shut-off valve 95, a gas shut-off valve 96, and an accumulator 97. The utilization unit 120 has a utilization heat exchanger 98 and a utilization fan 99. The communication piping group 130 has a liquid communication piping 131 and a gas communication piping 132.

[0040] The compressor 90 compresses the refrigerant R in a low-pressure gas state to a high-pressure gas state. The four-way switching valve 91 realizes the connection shown by the solid lines in Figure 1 when the refrigeration system 100 performs cold heat supply operation, and realizes the connection shown by the dashed lines in Figure 1 when the refrigeration system 100 performs hot heat supply operation. When the refrigeration system 100 performs cold heat supply operation, the heat source heat exchanger 92 functions as a condenser or a radiator, and the utilization heat exchanger 98 functions as an evaporator or a heat absorber. When the refrigeration system 100 performs hot heat supply operation, the heat source heat exchanger 92 functions as an evaporator or a heat absorber, and the utilization heat exchanger 98 functions as a condenser or a radiator.

[0041] (2) Configuration of Compressor 90 Fig. 2 shows a cross section of the compressor 90. The compressor 90 is a scroll compressor. The compressor 90 has a casing 10, a motor 20, a crankshaft 30, a scroll compression mechanism 40, a partition member 50, and a support member 55.

[0042] (2-1) Casing 10 The casing 10 has a body 11, an upper portion 12, and a lower portion 13 that are hermetically welded together. An internal space S is formed within the casing 10. The internal space S accommodates a motor 20, a crankshaft 30, a scroll compression mechanism 40, a partition member 50, and a support member 55. Furthermore, the internal space S is filled with refrigerant R. A suction pipe 15 is connected to the upper portion 12 for drawing in refrigerant R in a low-pressure gas state. A discharge pipe 16 is connected to the body 11 for discharging refrigerant R in a high-pressure gas state. An oil reservoir 14 is provided near the lower portion 13. The oil reservoir 14 stores lubricating oil L for lubricating the scroll compression mechanism 40 and other components.

[0043] (2-2) Motor 20 The motor 20 converts electrical energy into rotation of the crankshaft 30. The motor 20 includes a stator 21 and a rotor 22.

[0044] The stator 21 has a cylindrical shape and is fixed to the body 11. A plurality of coils (not shown) are provided in the stator 21. When an AC current flows through the coils, the coils generate an AC magnetic field.

[0045] The rotor 22 also has a cylindrical shape. The rotor 22 is rotatably disposed in a cavity at the center of the stator 21. A crankshaft 30 is fixed to the cavity of the rotor 22 itself. A permanent magnet (not shown) is attached to the rotor 22. The permanent magnet interacts with an AC magnetic field generated by the coil, thereby generating a rotational force for the rotor 22.

[0046] (2-3) Crankshaft 30 The crankshaft 30 transmits the rotation of the rotor 22 to the scroll compression mechanism 40. The crankshaft 30 has a main shaft portion 31 that shares a rotation axis with the rotor 22, and a pin portion 32 that is eccentric from the main shaft portion 31. When the rotor 22 rotates, the main shaft portion 31 rotates in response, and the pin portion 32 revolves to describe a circular orbit.

[0047] The main shaft portion 31 is rotatably supported by a main bearing 35 and a sub-bearing 36. The pin portion 32 is rotatably supported by a pin bearing 37.

[0048] An oil passage 33 is formed in the crankshaft 30. The oil passage 33 is used to pump up the lubricating oil L from the oil reservoir 14 and supply it to the scroll compression mechanism 40, the main bearing 35, the auxiliary bearing 36, and the pin bearing 37.

[0049] (2-4) Scroll Compression Mechanism 40 The scroll compression mechanism 40 compresses the refrigerant R, which is sucked from the suction pipe 15 in a low-pressure gas state, to a high-pressure gas state. The refrigerant R can be CO2. The scroll compression mechanism 40 has a fixed scroll 41 and a movable scroll 42. Both the fixed scroll 41 and the movable scroll 42 have spiral scroll wraps. The scroll wraps of the fixed scroll 41 and the movable scroll 42 are arranged to mesh with each other, thereby forming multiple compression chambers 43. A pin bearing 37 is arranged in a boss portion 44 extending from the bottom of the movable scroll 42. A pin portion 32 is inserted into the pin bearing 37. When the pin portion 32 orbits, the volume of the multiple compression chambers changes, and the refrigerant R therein is compressed.

[0050] (2-5) Partition Member 50 The partition member 50 divides the internal space S. The scroll compression mechanism 40 is disposed above the partition member 50, and the motor 20 is disposed below the partition member 50. The partition member 50 has a first partition member 60 and a second partition member 70.

[0051] (2-6) Support Member 55 The support member 55 is installed below the motor 20 and supports the lower part of the main shaft portion 31 of the crankshaft 30. The support member 55 is fixed to the body portion 11. The auxiliary bearing 36 is attached to the support member 55.

[0052] (3) Configuration of Partition Member 50 FIG. 3 shows the periphery of the partition member 50 in the compressor 90. The first partition member 60 is fixed to the body portion 11 by welding. The first partition member 60 has a center hole 61 and an elastic groove 62. The center hole 61 is for allowing the crankshaft 30 to pass through. The main bearing 35 is attached to the center hole 61. The elastic groove 62 has an annular shape with a first diameter D1. The elastic groove 62 promotes elastic deformation of the first partition member 60 to absorb vibrations and tilts of the crankshaft 30.

[0053] The second partition member 70 is located above the first partition member 60 and supports the scroll compression mechanism 40. The second partition member 70 has a center hole 71 and a seal ring receiving portion 72. The center hole 61 is for allowing the crankshaft 30 to pass through. The seal ring receiving portion 72 is for accommodating an annular seal ring 77 and has a ring shape with a second diameter D2. The second diameter D2 is larger than the first diameter D1 but smaller than 1.2 times the first diameter D1. The seal ring receiving portion 72 is configured as a groove having an inner peripheral wall and an outer peripheral wall so as to restrain the seal ring 77 on the inner and outer peripheral sides. Alternatively, the seal ring receiving portion 72 may have only one of the inner peripheral wall or the outer peripheral wall.

[0054] The second partition member 70 supports the fixed scroll 41 at its peripheral edge. The second partition member 70 and the seal ring 77 contact and support the movable scroll 42 near the center hole 71. As the movable scroll 42 orbits, the movable scroll 42 and the second partition member 70 slide at this contact point.

[0055] The first partition member 60 has a recess 65. On the other hand, the second partition member 70 has a protrusion 75 that protrudes downward. The first partition member 60 and the second partition member 70 are fixed to each other by press-fitting the protrusion 75 into the recess 65. Furthermore, the second partition member 70 is fixed to the body 11 of the casing 10 by press-fitting.

[0056] A storage space 51 is formed between the first partition member 60 and the second partition member 70. A portion of the lubricating oil L pumped up from the oil reservoir 14 is stored in the storage space 51. The lubricating oil L in the storage space 51 passes through an oil flow path 63 formed in the first partition member 60 and an oil flow path 73 formed in the second partition member 70, and is then supplied to the thrust surface 45 where the fixed scroll 41 and the movable scroll 42 are in contact with each other.

[0057] (4) Types of Iron Materials The partition member 50 is made of an iron material. Iron materials have different metal structures (microstructures) depending on the carbon content of the material. This metal structure significantly affects the sliding properties. Iron materials are classified into cast steel and cast iron depending on the carbon content. Cast steel is further classified into low-carbon steel, medium-carbon steel, and high-carbon steel depending on the carbon content.

[0058] Low-carbon steel has a carbon content of less than 0.1%. The metal structure of low-carbon steel is mainly ferrite. Ferrite is soft and highly ductile. Therefore, the surface of low-carbon steel is easily deformed and worn during sliding. To achieve its sliding properties, low-carbon steel requires an appropriate lubricant.

[0059] Medium carbon steel has a carbon content of 0.1% or more and less than 0.6%. The metal structure of medium carbon steel is a mixed structure of ferrite and pearlite. Medium carbon steel has wear resistance due to the pearlite. On the other hand, medium carbon steel has overall ductility due to the soft ferrite.

[0060] High carbon steel has a carbon content of 0.6% or more and less than 2.0%. The metal structure of high carbon steel contains a large amount of pearlite and cementite. High carbon steel has high hardness and strength. In addition, high carbon steel has a low coefficient of friction, which allows it to exhibit sliding properties.

[0061] Cast iron has a carbon content of 2.0% or more and less than 4.0%. The metal structure of cast iron has a structure in which flake-like or spherical graphite is dispersed. Cast iron has a low coefficient of friction due to the lubricating effect of graphite, and therefore exhibits excellent sliding properties.

[0062] (5) Material of Partition Member 50 The first partition member 60 is welded to the body portion 11 of the casing 10. The first partition member 60 is made of a material that is easy to weld. Specifically, the first partition member 60 is made of cast steel. Preferably, the first partition member 60 is made of medium carbon steel having a carbon content of 0.1% or more and 0.6% or less.

[0063] The second partition member 70 maintains a tight seal by contacting the movable scroll 42 via a seal ring 77. To enable the orbiting movement of the movable scroll 42, the second partition member 70 is made of a material with good sliding properties. Specifically, the second partition member 70 is made of cast iron with a carbon content of 2.0% or more and 4.0% or less. Preferably, the second partition member 70 is made of FC250.

[0064] (6) Features (6-1) The partition member 50 has a first partition member 60 and a second partition member 70, and the first partition member 60 is welded to the casing 10. Therefore, the second partition member 70 can be formed from a material that is not suitable for welding. By forming the second partition member 70 from a material with good sliding properties or a material with a high carbon content, the movement of the scroll compression mechanism 40 is less likely to be hindered by friction with the second partition member 70.

[0065] (6-2) The lubricating oil L is stored in the storage space 51. Therefore, it is easy to supply the lubricating oil L to the scroll compression mechanism 40 disposed near the storage space 51.

[0066] (6-3) The seal ring 77 is disposed so as to come into contact with the scroll compression mechanism 40. Therefore, the high-pressure refrigerant and the low-pressure refrigerant can be separated from each other in the internal space S of the casing while ensuring the movement of the scroll compression mechanism 40.

[0067] (6-4) The partition member 50 has the elastic grooves 62, which suppress tilting of the rotation axis of the crankshaft 30 and reduce the risk of the main bearing 35 being subjected to partial excessive pressure. This improves the reliability of the crankshaft 30, the main bearing 35, etc.

[0068] (6-5) Because the second diameter D2 is smaller than 1.2 times the first diameter D1, the area of ​​the region surrounded by the seal ring 77 does not become excessively large. Therefore, the force acting on the thrust surface 45 of the scroll compression mechanism 40 can be reduced.

[0069] (6-6) The second partition member 70 is fixed to the casing 10 by press-fitting. Therefore, there is no need to perform welding to fix the second partition member 70 to the casing.

[0070] (6-7) The first partition member 60 and the second partition member 70 are firmly fixed to each other by press fitting. Therefore, the first partition member 60 and the second partition member 70 are stably fixed to each other.

[0071] (6-8) When the refrigerant R compressed by the scroll compression mechanism 40 is CO2, the refrigerant R is used under relatively high pressure conditions. The compressor 90 of the present disclosure is suitable for using CO2 as the refrigerant R because it can easily withstand large forces acting on the thrust surface 45.

[0072] (6-9) The first partition member 60 is made of cast steel. Therefore, it is possible to weld the first partition member 60 to the casing 10. The second partition member 70 is made of steel. Therefore, friction between the second partition member 70 and the scroll compression mechanism 40 is low.

[0073] <Modifications of the Embodiment> (7) Modifications (7-1) Modification A A second partition member 70 having a different shape from that of the above-described embodiment may also be used. FIG. 4 shows a cross section of a second partition member 70 according to Modification A. The central hole 71 of the second partition member 70 is tapered. The central hole 71 has a small third diameter D3 at its upper end and a fourth diameter D4 at its lower end that is larger than the third diameter D3. By using a second partition member 70 having such a shape, the elastic groove 62 having a large first diameter D1 can be exposed. In other words, the second diameter D2 can be made smaller than the first diameter D1.

[0074] With this configuration, the area of ​​the region surrounded by the seal ring 77 is small because the first diameter D1 is small. Therefore, the force acting on the thrust surface 45 of the scroll compression mechanism 40 can be reduced. In addition, because the first partition member 60 is configured as a separate member from the second partition member 70, the second diameter D2 can be set large despite the small first diameter D1. Therefore, the volume of lubricating oil L stored in the storage space 51 can be increased.

[0075] (7-2) Modification B In the above-described embodiment, the first partition member 60 is formed of cast steel. Alternatively, the first partition member 60 can be formed of cast-inserted cast iron. In this case, iron is embedded in the outer periphery of the cast iron, which is not suitable for welding, so that the first partition member 60 can be welded to the casing 10. The cast iron may be FC250.

[0076] (7-3) Modification C In the above-described embodiment, the first partition member 60 is made of cast steel. Alternatively, as shown in FIG. 5, the first partition member 60 may be made of cast iron into which a welding pin 69 is press-fitted. Therefore, since the welding pin 69 is fixed to the cast iron, which is not suitable for welding, it is possible to weld the first partition member 60 to the casing 10. The cast iron may be FC250.

[0077] (7-4) Modification D In the above-described embodiment, the refrigerant R may be CO2. Alternatively, the refrigerant R may be a substance other than CO2.

[0078] <Conclusion> Although the embodiments of the present disclosure have been described above, it will be understood that various changes in form and details can be made without departing from the spirit and scope of the present disclosure as defined in the claims.

[0079] DESCRIPTION OF SYMBOLS 10: Casing 11: Body 12: Upper part 13: Lower part 20: Motor 30: Crankshaft 31: Main shaft part 32: Pin part 33: Oil passage 35: Main bearing (bearing) 36: Sub-bearing 37: Pin bearing 40: Scroll compression mechanism 41: Fixed scroll 42: Orbiting scroll 45: Thrust surface 50: Partition member 51: Storage space 60: First partition member 62: Elastic groove 65: Recess 69: Welding pin 70: Second partition member 72: Seal ring receiving part 75: Protrusion 77: Seal ring 90: Compressor 100: Refrigeration device D1: First diameter D2: Second diameter L: Lubricating oil R: Refrigerant S: Internal space

[0080] Patent No. 7174287

Claims

1. A compressor (90) comprising: a casing (10) having an internal space (S); a scroll compression mechanism (40) disposed in the internal space; and a partition member (50) that separates the internal space, the partition member (50) having a first partition member (60) welded to the casing and a second partition member (70) that supports the scroll compression mechanism.

2. The compressor according to claim 1, wherein the second partition member has higher slidability than the first partition member.

3. The compressor according to claim 2, wherein the carbon content of the second partition member is greater than the carbon content of the first partition member.

4. The compressor according to claim 2 or 3, wherein lubricating oil (L) is stored in a storage space (51) formed between the second partition member and the first partition member.

5. A compressor according to any one of claims 1 to 4, wherein the second partition member has a seal ring receiving portion (72) in the shape of an annulus, a seal ring (77) is installed in the seal ring receiving portion, the scroll compression mechanism has a movable scroll (42), and the seal ring contacts the movable scroll.

6. The compressor according to claim 5, wherein the first partition member holds a bearing (35), and the first partition member has an elastic groove (62) in the shape of a ring.

7. The compressor according to claim 6, wherein the second diameter (D2) of the seal ring receiving portion is larger than the first diameter (D1) of the elastic groove and smaller than 1.2 times the first diameter.

8. The compressor according to claim 6, wherein the second diameter (D2) of the seal ring receiving portion is smaller than the first diameter (D1) of the elastic groove.

9. The compressor according to any one of claims 1 to 8, wherein the second partition member is fixed to the casing by press fitting.

10. A compressor according to any one of claims 1 to 9, wherein the second partition member has a convex portion (75), the first partition member has a concave portion (65), and the convex portion is press-fitted into the concave portion.

11. The compressor according to any one of claims 1 to 10, wherein the scroll compression mechanism compresses a CO2 refrigerant.

12. A compressor according to any one of claims 1 to 11, wherein the second partition member is made of cast iron.

13. A compressor according to any one of claims 1 to 12, wherein the first partition member is made of cast steel.

14. A compressor according to any one of claims 1 to 13, wherein the first partition member is formed of cast iron that has been cast-in.

15. A compressor according to any one of claims 1 to 14, wherein the first partition member is made of cast iron with a weld pin (69) pressed into it.

16. A refrigeration system (100) comprising a compressor according to any one of claims 1 to 15.

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