JP2017145795A - Scroll compressor and air conditioner equipped therewith - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a scroll compressor having high suction efficiency.SOLUTION: The scroll compressor includes a casing 20, a fixed scroll 30 provided in the casing 20, a suction connection port 34e provided in the fixed scroll 30, a first suction pipe 14 inserted into the suction connection port 34e, and a second suction pipe 15 inserted into the first suction pipe 14, the first suction pipe 14 being formed of steel, the second suction pipe 15 being formed of copper. The scroll compressor further includes a cavity part Sa formed between the inside of the first suction pipe 14 and the outside of the second suction pipe 15.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a scroll compressor and an air conditioner including the same.

  In a conventional scroll compressor, a suction overheating state occurs, and suction efficiency may be reduced. Therefore, in recent years, a scroll compressor having a double-pipe structure suction pipe has been studied. For example, Patent Document 1 (Japanese Patent Laid-Open No. 2015-17521) discloses a scroll compressor having an iron suction inner pipe and a copper suction outer pipe.

  However, in the scroll compressor described in Patent Document 1 described above, since the suction outer pipe is a copper pipe, the suction pipe may be inclined by deformation due to an external force. As a result, an unbalanced load is applied when the check valve provided at the suction port of the fixed scroll is seated, and the check valve may be worn. Moreover, in the scroll compressor of patent document 1, since the suction outer pipe | tube which is a copper pipe is press-fitted and fastened, sealing performance becomes inadequate. Due to these reasons, in the conventional scroll compressor, the suction efficiency may still decrease.

  An object of the present invention is to provide a scroll compressor having high suction efficiency and an air conditioner including the scroll compressor.

  A scroll compressor according to a first aspect of the present invention includes a casing, a fixed scroll provided in the casing, a suction connection port provided in the fixed scroll, a first suction pipe inserted into the suction connection port, A second suction pipe inserted into the first suction pipe. Here, the first suction pipe is made of steel, and the second suction pipe is made of copper.

  In the scroll compressor according to the first aspect, since the first suction pipe made of steel is inserted into the suction connection port of the fixed scroll and the second suction pipe made of copper is inserted into the first suction pipe, the outer side is made of steel. As a result, it is possible to secure the assembly strength. On the other hand, since the inside is made of copper, processing is easy, for example, formation of a void is easy. Thereby, a scroll compressor with high suction efficiency can be manufactured easily.

  A scroll compressor according to a second aspect of the present invention is the scroll compressor according to the first aspect, wherein a gap is formed between the inside of the first suction pipe and the outside of the second suction pipe. Further, at least a part of the gap is disposed in the casing.

  In the scroll compressor according to the second aspect, a gap is formed between the inside of the first suction pipe and the outside of the second suction pipe, and at least a part of the gap is disposed in the casing. A space | gap part can be made into heat insulation space. Thereby, even if the heating by the operation of the scroll compressor occurs, the transfer of heat to the refrigerant to be sucked can be avoided, and a scroll compressor having high suction efficiency can be provided.

  A scroll compressor according to a third aspect of the present invention is the scroll compressor according to the first or second aspect, wherein the first suction pipe has a stepped portion with an increased inner diameter, and the second suction pipe sucks the refrigerant. The outer diameter of the inlet side has a pipe expanding part expanded to the inner diameter of the step part.

  In the scroll compressor according to the third aspect, since the second suction pipe is made of copper, the pipe expansion portion can be easily formed. In other words, the gap can be easily formed.

A scroll compressor according to a fourth aspect of the present invention is the scroll compressor according to the third aspect, wherein the first suction pipe has a locking portion that forms a step on the outlet side from the step. And the exit end of the second suction pipe is locked to the locking portion.
Since the scroll compressor according to the fourth aspect has the above-described configuration, a double-pipe structure can be easily formed simply by inserting the second suction pipe into the first suction pipe.

  A scroll compressor according to a fifth aspect of the present invention is the scroll compressor according to any one of the first to fourth aspects, further comprising a seal member that seals between the suction connection port and the first suction pipe.

  In the scroll compressor according to the fifth aspect, since the space between the suction connection port and the first suction pipe is sealed, it is possible to avoid a decrease in the performance of the compressor. Further, since the first suction pipe made of steel is inserted into the suction connection port, it is possible to avoid the entire suction pipe from being inclined.

  The scroll compressor which concerns on the 6th viewpoint of this invention is further provided with the 1st joint pipe made from steel welded to a casing in the scroll compressor in any one of the 1st viewpoint to the 5th viewpoint. The first suction pipe has an inlet side inserted into the first joint pipe and an outlet side inserted into the suction connection port.

  In the scroll compressor according to the sixth aspect, since the inlet side of the first suction pipe is inserted into the first joint pipe made of steel, the positioning reliability can be improved.

  A scroll compressor according to a seventh aspect of the present invention is the scroll compressor according to the sixth aspect, further comprising a second joint pipe made of copper inserted into the inlet side of the first joint pipe. Further, the second suction pipe passes through the second joint pipe, and the inlet end of the second joint pipe is brazed to the second suction pipe.

  In the scroll compressor according to the seventh aspect, since the second suction pipe and the second joint pipe are made of copper, both can be easily connected by brazing work.

  A scroll compressor according to an eighth aspect of the present invention is the scroll compressor according to any one of the first to seventh aspects, wherein the fixed scroll has a check valve (34v) for preventing a reverse flow of the refrigerant at the suction connection port. Have. The check valve is locked at the outlet end of the first suction pipe.

  In the scroll compressor according to the eighth aspect, since the first suction pipe is made of steel, it is possible to avoid deformation of the shape and displacement due to collision with the check valve.

  A scroll compressor according to a ninth aspect of the present invention is used for compressing a refrigerant containing R32 in any of the scroll compressors according to the first to eighth aspects.

  In the scroll compressor according to the ninth aspect, even if the above-described refrigerant whose discharge gas refrigerant temperature is likely to be high is used, the void portion becomes a heat insulating space, so that a reduction in suction efficiency can be avoided.

  An air conditioner according to a tenth aspect of the present invention includes the scroll compressor according to any one of the first to ninth aspects.

  According to the air conditioner pertaining to the tenth aspect, since the scroll compressor with high suction efficiency is provided, an air conditioner with improved air conditioning capability can be provided.

  An assembling method according to an eleventh aspect of the present invention is a method for assembling a scroll compressor according to the fourth aspect, wherein a step of installing a fixed scroll on a body part of a casing and a suction connection port provided in the fixed scroll A step of inserting the first suction pipe, a step of inserting the second suction pipe until the first suction pipe is locked to the locking portion of the first suction pipe, an expanded portion of the second suction pipe, and an inlet end of the first suction pipe; And a step of penetrating the second suction pipe and fitting a lid portion of the casing to the body portion.

  In the assembling method according to the eleventh aspect, since the first suction pipe made of steel is arranged outside the second suction pipe made of copper, deformation of the entire suction pipe during assembly can be avoided. As a result, a scroll compressor having high suction efficiency can be easily assembled.

  In the scroll compressor according to the present invention, a gap is formed between the inside of the first suction pipe and the outside of the second suction pipe, and at least a part of the gap is arranged in the casing. A part can be made into a heat insulation space. Thereby, even if the heating by the operation of the scroll compressor occurs, the transfer of heat to the refrigerant to be sucked can be avoided, and a scroll compressor having high suction efficiency can be provided.

It is a refrigerant circuit figure of the air harmony device in which the scroll compressor concerning one embodiment of the present invention is used. It is a longitudinal section of a scroll compressor concerning one embodiment of the present invention. It is a schematic diagram which shows the structure of the suction pipe which concerns on one Embodiment of this invention.

  A scroll compressor 10 according to a first embodiment of the compressor of the present invention will be described with reference to the drawings. In addition, the scroll compressor 10 which concerns on the following embodiment is only an example of the compressor of this invention, and can be suitably changed in the range which does not deviate from the meaning of this invention.

(1) Outline of Air Conditioner Using Scroll Compressor Scroll compressor 10 according to the first embodiment of the present invention is used in air conditioner 1. FIG. 1 is a schematic diagram of an air conditioner 1 in which a scroll compressor 10 is employed. Here, the air conditioner dedicated to the cooling operation is shown, but the air conditioner in which the scroll compressor 10 is employed 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 scroll compressor 10, 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 scroll compressor 10, an outdoor heat exchanger 7, and an expansion valve 8. These devices are connected by a refrigerant pipe as shown in FIG.

  The scroll compressor 10 compresses the refrigerant sucked through the suction pipe 13 in a compression chamber Sc described later, and discharges the compressed refrigerant from the discharge pipe 24.

  In addition, in the scroll compressor 10 which concerns on this embodiment, and the air conditioning apparatus 1 provided with the same, the single refrigerant | coolant of R32 etc. are used as an example.

(2) Detailed Description of Scroll Compressor As shown in FIG. 2, the scroll compressor 10 includes a casing 20, a scroll compression mechanism 60 including a fixed scroll 30, a drive motor 70, a crankshaft 80, and a lower bearing. 90.

  The scroll compressor 10 will be described in detail below. In the following description, expressions such as “upper” and “lower” may be used in order to explain the positional relationship of the constituent members. Here, the direction of the arrow U in FIG. 2 is called up, and the direction opposite to the arrow U is called down. In the following description, expressions such as “vertical”, “horizontal”, “vertical”, “horizontal” may be used, but the vertical direction is defined as the vertical direction and the vertical direction.

(2-1) Casing The scroll compressor 10 has a vertically long cylindrical hermetic dome-shaped casing 20. The casing 20 includes a substantially cylindrical cylindrical member (body portion) 21 that is open at the top and bottom, and an upper lid 22 a and a lower lid 22 b provided at the upper end and the lower end of the cylindrical member 21, respectively. The cylindrical member 21 and the upper lid 22a and the lower lid 22b are fixed by welding so as to keep airtightness.

  The casing 20 accommodates the components of the scroll compressor 10 including the scroll compression mechanism 60, the drive motor 70, the crankshaft 80, and the lower bearing 90. The scroll compression mechanism 60 is disposed at the upper part in the cylindrical member 21. An oil sump space So is formed in the lower part of the casing 20. Refrigerating machine oil O for lubricating the scroll compression mechanism 60 and the like is stored in the oil reservoir space So.

  A suction pipe 13 that sucks the gas refrigerant and supplies the gas refrigerant to the scroll compression mechanism 60 is provided in the upper part of the casing 20 so as to penetrate the upper lid 22a. The lower end of the suction pipe 13 is connected to the suction connection port 34e of the fixed scroll 30 (see FIG. 2). Thereby, the suction pipe 13 communicates with a compression chamber Sc of the scroll compression mechanism 60 described later. The low-pressure refrigerant in the refrigeration cycle before compression by the scroll compressor 10 flows into the suction pipe 13. A further detailed configuration of the suction pipe 13 will be described later.

  In addition, the inside of the casing 20 is a high-pressure space filled with a high-pressure refrigerant after being compressed by the scroll compression mechanism 60, whereby the scroll compressor 10 is a so-called high-pressure dome type compressor. . A discharge pipe 24 through which the refrigerant discharged to the outside of the casing 20 passes is provided at an intermediate portion of the cylindrical member 21 of the casing 20. More specifically, the discharge pipe 24 is disposed so that the end of the discharge pipe 24 inside the casing 20 protrudes into a high-pressure space S <b> 1 formed below the housing 61 of the scroll compression mechanism 60. From the discharge pipe 24, high-pressure refrigerant in the refrigeration cycle after compression by the scroll compression mechanism 60 flows out.

(2-2) Scroll Compression Mechanism As shown in FIG. 2, the scroll compression mechanism 60 is mainly compressed in combination with the housing 61, the fixed scroll 30 disposed above the housing 61, and the fixed scroll 30. And a movable scroll 40 that forms the chamber Sc.

(2-2-1) Fixed Scroll As shown in FIG. 2, the fixed scroll 30 has a flat fixed side end plate 32 and a spiral fixed projection protruding from the front surface (the lower surface in FIG. 2) of the fixed side end plate 32. A side wrap 33 and an outer edge portion 34 surrounding the fixed side wrap 33 are provided.

  A non-circular discharge port 32a communicating with the compression chamber Sc of the scroll compression mechanism 60 is formed in the center of the fixed side end plate 32 so as to penetrate the fixed side end plate 32 in the thickness direction. The refrigerant compressed in the compression chamber Sc is discharged from the discharge port 32a, passes through a refrigerant passage (not shown) formed in the fixed scroll 30 and the housing 61, and flows into the high-pressure space S1.

  A suction connection port 34 e is provided at the outer edge 34 of the fixed scroll 30. The refrigerant flowing from the suction pipe 13 is introduced into the compression chamber Sc of the scroll compression mechanism 60 through the suction connection port 34e. The suction connection port 34e is provided with a check valve 34v that prevents the refrigerant from flowing backward.

(2-2-2) Movable Scroll As shown in FIG. 2, the movable scroll 40 includes a flat plate-like movable side end plate 41 and a spiral movable portion protruding from the front surface (upper surface in FIG. 2) of the movable side end plate 41. It has a side wrap 42 and a boss portion 43 formed in a cylindrical shape protruding from the back surface (the lower surface in FIG. 2) of the movable side end plate 41.

  The fixed side wrap 33 of the fixed scroll 30 and the movable side wrap 42 of the movable scroll 40 are combined in a state where the lower surface of the fixed side end plate 32 and the upper surface of the movable side end plate 41 face each other. A compression chamber Sc is formed between the adjacent fixed wrap 33 and the movable wrap 42. As the movable scroll 40 revolves with respect to the fixed scroll 30 as will be described later, the volume of the compression chamber Sc changes periodically, and the refrigerant is sucked, compressed, and discharged in the scroll compression mechanism 60.

  The boss portion 43 is a cylindrical portion whose upper end is blocked. The movable scroll 40 and the crankshaft 80 are connected by inserting an eccentric portion 81 of the crankshaft 80 described later into the hollow portion of the boss portion 43. The boss portion 43 is disposed in an eccentric portion space 62 formed between the movable scroll 40 and the housing 61. The eccentric portion space 62 communicates with the high-pressure space S1 via an oil supply path 83 of the crankshaft 80 described later, and high pressure acts on the eccentric portion space 62. With this pressure, the lower surface of the movable side end plate 41 in the eccentric portion space 62 is pushed upward toward the fixed scroll 30. Due to this force, the movable scroll 40 comes into close contact with the fixed scroll 30.

  The movable scroll 40 is supported by the housing 61 via the Oldham ring 58. The Oldham ring 58 is a member that prevents the movable scroll 40 from rotating and revolves. When the crankshaft 80 rotates by using the Oldham ring 58, the movable scroll 40 connected to the crankshaft 80 at the boss portion 43 revolves without rotating with respect to the fixed scroll 30, and the refrigerant in the compression chamber Sc. Is compressed.

(2-2-3) Housing The housing 61 is press-fitted into the cylindrical member 21, and is fixed to the cylindrical member 21 over the entire circumferential direction on the outer peripheral surface thereof. Further, the housing 61 and the fixed scroll 30 are fixed by a bolt or the like (not shown) so that the upper end surface of the housing 61 is in close contact with the lower surface of the outer edge portion 34 of the fixed scroll 30.

  The housing 61 is formed with a recess 61a disposed so as to be recessed in the central portion of the upper surface, and a bearing portion 61b disposed below the recess 61a.

  The recessed part 61a surrounds the side surface of the eccentric part space 62 in which the boss part 43 of the movable scroll 40 is disposed.

  A bearing 63 that supports the main shaft 82 of the crankshaft 80 is disposed in the bearing portion 61b. The bearing 63 rotatably supports the main shaft 82 inserted into the bearing 63.

(2-3) Drive Motor The drive motor 70 is rotatably accommodated inside the stator 71 with an annular stator 71 fixed to the inner wall surface of the cylindrical member 21 with a slight gap (air gap passage). And a rotor 72.

  The rotor 72 is connected to the movable scroll 40 via a crankshaft 80 disposed so as to extend in the vertical direction along the axial center of the cylindrical member 21. As the rotor 72 rotates, the movable scroll 40 revolves with respect to the fixed scroll 30.

(2-4) Crankshaft The crankshaft 80 (drive shaft) is disposed in the cylindrical member 21 and drives the scroll compression mechanism 60. Specifically, the crankshaft 80 transmits the driving force of the driving motor 70 to the movable scroll 40. The crankshaft 80 is disposed so as to extend in the vertical direction along the axial center of the cylindrical member 21, and connects the rotor 72 of the drive motor 70 and the movable scroll 40 of the scroll compression mechanism 60.

  The crankshaft 80 includes a main shaft 82 whose center axis coincides with the axis of the cylindrical member 21, and an eccentric portion 81 that is eccentric with respect to the axis of the cylindrical member 21.

  The eccentric portion 81 is inserted into the boss portion 43 of the movable scroll 40 as described above.

  The main shaft 82 is rotatably supported by a bearing 63 of the bearing portion 61b of the housing 61 and a lower bearing 90 described later. The main shaft 82 is connected to the rotor 72 of the drive motor 70 between the bearing portion 61 b and the lower bearing 90.

  An oil supply path 83 for supplying the refrigerator oil O to the scroll compression mechanism 60 and the like is formed inside the crankshaft 80. The lower end of the main shaft 82 is located in an oil sump space So formed in the lower part of the casing 20, and the refrigerating machine oil O in the oil sump space So is supplied to the scroll compression mechanism 60 and the like through the oil supply path 83.

(2-5) Lower Bearing The lower bearing 90 is provided at the lower part in the cylindrical member 21 and supports the crankshaft 80. Specifically, the lower bearing 90 is disposed below the drive motor 70. Further, the lower bearing 90 is fixed to the lower housing 140. The lower bearing 90 constitutes a bearing on the lower end side of the crankshaft 80 and rotatably supports the main shaft 82 of the crankshaft 80.

(3) Detailed configuration of suction pipe and assembly method of suction pipe portion (3-1) Detailed configuration of suction pipe FIG. 3 is a partially enlarged view of the scroll compressor according to the present embodiment, and shows the configuration of the suction pipe. It is a schematic diagram.

  The suction pipe 13 according to the present embodiment has a double pipe structure having a first suction pipe 14 and a second suction pipe 15. The first suction pipe 14 is a steel pipe inserted into a suction connection port 34 e provided in the fixed scroll 30. The second suction pipe 15 is a copper pipe inserted into the first suction pipe 14. A gap Sa is formed between the inside of the first suction pipe 14 and the outside of the second suction pipe 15. Further, at least a part of the gap portion Sa is configured to be disposed in the casing 20. With such a configuration, even if the inside of the casing 20 becomes high temperature, the gap portion Sa of the suction pipe 13 functions as a heat insulating space.

  More specifically, the first suction pipe 14 has a stepped portion 14d having an increased inner diameter. Further, the second suction pipe 15 has a pipe expanding portion 15x in which the outer diameter on the inlet side from which the refrigerant is sucked is expanded to the inner diameter of the stepped portion 14d. Then, the inlet end 14a of the first suction pipe 14 and the expanded portion 15x of the second suction pipe 15 are brazed. The first suction pipe 14 has a locking portion 14k that forms a further step on the outlet side from the step portion 14d. Then, the outlet end 15b of the second suction pipe 15 is locked to the locking portion 14k.

  Further, the first joint pipe 17 made of steel is welded to the casing 20. The inlet side of the first suction pipe 14 is inserted into the first joint pipe 17, and the outlet side of the first suction pipe 14 is inserted into the suction connection port 34e. A copper second joint pipe 18 is inserted on the inlet side of the first joint pipe 17. Here, the second suction pipe 15 passes through the second joint pipe 18. Further, the inlet end 18 a of the second joint pipe 18 is brazed to the second suction pipe 15.

  A seal member 16 such as an O-ring is provided between the suction connection port 34e and the first suction pipe 14, and both are sealed. Further, the check valve 34v provided at the above-described suction connection port 34e is locked at the outlet end 14b of the first suction pipe 14.

(3-2) Method of assembling suction pipe portion The scroll compressor 10 having the above-described double pipe structure suction pipe 13 is assembled as follows.

  First, the scroll compression mechanism 60 including the fixed scroll 30 is installed on the cylindrical member (body part) 21 of the casing 20.

  Subsequently, the first suction pipe 14 is inserted into the suction connection port 34 e provided in the fixed scroll 30. Then, the second suction pipe 15 is inserted until it is locked by the locking portion 14k of the first suction pipe 14. Then, the expanded portion 15x of the second suction pipe 15 and the inlet end 14a of the first suction pipe 14 are brazed.

  On the other hand, the first joint pipe 17 is welded to the upper cover 22 a of the casing 20, and the second joint pipe 18 is inserted into the first joint pipe 17.

  Then, the upper lid 22 a of the casing 20 is fitted into the cylindrical member 21 so that the second suction pipe 15 passes through the first joint pipe 17 and the second joint pipe 18.

  Thereafter, the second suction pipe 15 and the second joint pipe 18 are brazed and fixed.

(4) Operation of Scroll Compressor The operation of the scroll compressor 10 described above will be described.

  First, the drive motor 70 is activated. Thereby, the rotor 72 rotates with respect to the stator 71, and the crankshaft 80 fixed to the rotor 72 rotates. When the crankshaft 80 rotates, the movable scroll 40 connected to the crankshaft 80 revolves with respect to the fixed scroll 30. Then, the low-pressure gas refrigerant in the refrigeration cycle passes through the suction pipe 13 and is sucked into the compression chamber Sc from the peripheral side of the compression chamber Sc. As the movable scroll 40 revolves, the suction pipe 13 and the compression chamber Sc no longer communicate with each other. Then, as the volume of the compression chamber Sc decreases, the pressure in the compression chamber Sc starts to increase.

  The refrigerant in the compression chamber Sc is compressed as the volume of the compression chamber Sc decreases, and finally becomes a high-pressure gas refrigerant. The high-pressure gas refrigerant is discharged from a discharge port 32 a located near the center of the fixed side end plate 32. Thereafter, the high-pressure gas refrigerant passes through a refrigerant passage (not shown) formed in the fixed scroll 30 and the housing 61 and flows into the high-pressure space S1. The high-pressure gas refrigerant compressed by the scroll compression mechanism 60 that has flowed into the high-pressure space S <b> 1 is discharged from the discharge pipe 24.

  Here, the gas refrigerant discharged from the discharge port 32a is at a high temperature. Therefore, the suction pipe 13 existing in the same atmosphere as the discharge port 32a is also exposed to the high temperature gas, and the suction efficiency of the scroll compressor 10 may be lowered.

  Therefore, the scroll compressor 10 according to the present embodiment has the following characteristics so that the suction efficiency does not decrease due to such heating.

(5) Features (5-1)
The scroll compressor 10 according to the present embodiment includes a casing 20, a fixed scroll 30 provided in the casing, a suction connection port 34e provided in the fixed scroll, and a first suction pipe 14 inserted into the suction connection port. And a second suction pipe 15 inserted into the first suction pipe. Here, the first suction pipe 14 is made of steel, and the second suction pipe 15 is made of copper.

  Therefore, according to such a scroll compressor 10, since the first suction pipe 14 made of steel is inserted into the suction connection port 34e and the second suction pipe 15 made of copper is inserted into the first suction pipe 14, the outer side The steel has a double-pipe structure made of steel, ensuring assembly strength. On the other hand, since the inner side is made of copper, processing is easy, for example, formation of the gap portion Sa is easy. This makes it possible to manufacture a scroll compressor with high suction efficiency.

  In the scroll compressor 10 according to the present embodiment, a gap portion Sa is formed between the inside of the first suction pipe 14 and the outside of the second suction pipe 15, and at least a part of the gap portion Sa is the casing 20. Placed inside. Thereby, the said space | gap part Sa can be made into heat insulation space. And even if the heating by the driving | operation of the scroll compressor 10 arises, transmission of the heat | fever to the refrigerant | coolant suck | inhaled can be avoided. As a result, the scroll compressor 10 with high suction efficiency can be provided.

  In addition, when a refrigerant | coolant is a hydrofluorocarbon (HFC), for example, when it is a single refrigerant | coolant of R32, discharge gas becomes high temperature compared with another refrigerant | coolant. In general, the high-pressure dome of the scroll compressor 10 has a structure in which heat transfer to the suction refrigerant is likely to occur. In this regard, in the scroll compressor 10 according to the present embodiment, for example, even if the suction refrigerant of R32 passes through the high-pressure dome, the gap portion Sa becomes a heat insulating space, so that a reduction in suction efficiency can be avoided.

  The scroll compressor 10 has a high suction efficiency and contributes to the improvement of the air conditioning capability of the air conditioner 1.

(5-2)
Further, in the scroll compressor 10 according to the present embodiment, the first suction pipe 14 has a stepped portion 14d having an increased inner diameter, and the second suction pipe 15 has a stepped outer diameter on the inlet side from which the refrigerant is sucked. It has an expanded portion 15x expanded to an inner diameter of 14d. Then, the inlet end 14a of the first suction pipe 14 and the expanded portion 15x of the second suction pipe 15 are brazed.

  In such a scroll compressor 10, since the second suction pipe 15 is made of copper, the pipe expansion portion 15x can be easily formed. In other words, the gap portion Sa can be easily formed.

  In addition, since the gap portion Sa is formed by expanding the inner second suction pipe 15, the prior art in which the outer suction outer pipe is expanded to form the gap portion (Japanese Patent Laid-Open No. 2015-17521). And the like, it is possible to prevent oil from entering the gap portion Sa. As a result, the scroll compressor 10 with high suction efficiency can be provided.

(5-3)
Further, in the scroll compressor 10 according to the present embodiment, the first suction pipe 14 has a locking portion 14k that forms a step on the outlet side from the step portion 14d. Then, the outlet end 15b of the second suction pipe 15 is locked to the locking portion 14k. With such a configuration, a double pipe structure can be easily formed by simply inserting the second suction pipe 15 into the first suction pipe 14.

(5-4)
The scroll compressor 10 according to the present embodiment further includes a seal member 16 that seals between the suction connection port 34e and the first suction pipe 14. Since the space between the suction connection port 34e and the first suction pipe 14 is sealed by the seal member, it is possible to avoid a decrease in the performance of the compressor. Further, since the steel first suction pipe 14 is inserted into the suction connection port 34e, it is possible to avoid the suction pipe 13 from being inclined.

(5-5)
The scroll compressor 10 according to the present embodiment further includes a steel first joint pipe 17 welded to the casing 20. The first suction pipe 14 has an inlet side inserted into the first joint pipe 17 and an outlet side inserted into the suction connection port 34e. Thus, since the inlet side of the 1st suction pipe 14 is inserted in the steel 1st joint pipe 17, the reliability of positioning can be improved.

  Furthermore, the scroll compressor according to the present embodiment includes a second joint pipe 18 made of copper that is inserted into the inlet side of the first joint pipe 17. Further, the second suction pipe 15 passes through the second joint pipe 18, and the inlet end 18 a of the second joint pipe 18 is brazed to the second suction pipe 15. Here, since the second suction pipe 15 and the second joint pipe 18 are made of copper, both can be easily connected by a brazing operation.

(5-6)
In the scroll compressor 10 according to the present embodiment, the fixed scroll 30 has a check valve 34v at the suction connection port 34e for preventing the refrigerant from flowing backward. The check valve 34v is locked at the outlet end 14b of the first suction pipe 14. In this configuration, since the first suction pipe 14 is made of steel, it is possible to avoid deformation of the shape and displacement due to collision with the check valve 34v.

(5-7)
The assembly method for assembling the scroll compressor 10 according to the present embodiment includes a step of installing the fixed scroll 30 on the cylindrical member (body part) 21 of the casing 20 and a suction connection port 34e provided in the fixed scroll 30. A step of inserting the first suction pipe 14, a step of inserting the second suction pipe 15 until the first suction pipe 14 is locked to the locking portion 14k of the first suction pipe 14, and the expanded portion 15x of the second suction pipe 15 and the first suction pipe A step of brazing the inlet end 23F1 of the pipe 14, and a step of fitting the upper lid 22a of the casing 20 into the cylindrical member 21 through the second suction pipe 15.

  In such an assembling method, the second suction pipe 15 made of steel is disposed outside the first suction pipe 14 made of copper, so that deformation of the first suction pipe 14 during the assembly can be avoided. As a result, the scroll compressor 10 with high suction efficiency can be easily assembled.

(6) Modification The suction pipe 13 according to the present embodiment is applicable to any scroll compressor. For example, the suction pipe 13 according to the present embodiment can also be applied to a scroll compressor in which intermediate pressure refrigerant is injected.

<Appendix>
In addition, this invention is not limited to the said embodiment as it is. The present invention can be embodied by modifying the components without departing from the scope of the invention in the implementation stage. In addition, the present invention can form various inventions by appropriately combining a plurality of constituent elements disclosed in the above embodiments. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, constituent elements may be appropriately combined in different embodiments.

1 Air Conditioner 10 Scroll Compressor 13 Suction Pipe 14 First Suction Pipe 14a First Suction Pipe Inlet End 14b First Suction Pipe Outlet End 14d Step 14k Locking Part 15 Second Suction Pipe 15b Second Suction Pipe Outlet end 15x Expanded pipe portion 16 Seal member 17 First joint pipe 18 Second joint pipe 18a Second joint pipe inlet end 20 Casing 21 Cylindrical member (body part)
22a Top lid (lid)
30 Fixed scroll 34e Suction connection port 34v Check valve Sa Gap

JP 2015-17521 A

Claims (11)

A casing (20);
A fixed scroll (30) provided in the casing;
A suction connection port (34e) provided in the fixed scroll;
A first suction pipe (14) inserted into the suction connection port;
A second suction pipe (15) inserted into the first suction pipe;
A scroll compressor (10) comprising: the first suction pipe is made of steel;
The second suction pipe is made of copper;
Scroll compressor. A gap (Sa) is formed between the inside of the first suction pipe and the outside of the second suction pipe,
At least a portion of the gap is disposed within the casing;
The scroll compressor according to claim 1. The first suction pipe has a stepped portion (14d) whose inner diameter increases,
The second suction pipe has a pipe expansion portion (15x) in which an outer diameter on the inlet side from which the refrigerant is sucked is expanded to the inner diameter of the stepped portion.
The scroll compressor according to claim 1 or 2. The first suction pipe has a locking part (14k) that forms a step on the outlet side from the step part.
An outlet end (15b) of the second suction pipe is locked to the locking portion;
The scroll compressor according to claim 3. A seal member (16) for sealing between the suction connection port and the first suction pipe;
The scroll compressor according to any one of claims 1 to 4. A steel first joint pipe (17) welded to the casing;
The first suction pipe has an inlet side inserted into the first joint pipe and an outlet side inserted into the suction connection port.
The scroll compressor according to any one of claims 1 to 5. A copper second joint pipe (18) inserted on the inlet side of the first joint pipe;
The second suction pipe passes through the second joint pipe, and an inlet end (18a) of the second joint pipe is brazed to the second suction pipe;
The scroll compressor according to claim 6. The fixed scroll has a check valve (34v) for preventing a reverse flow of the refrigerant at the suction connection port,
The check valve is locked at an outlet end (14b) of the first suction pipe.
A scroll compressor given in any 1 paragraph of Claims 1-7. Used to compress refrigerant containing R32,
The scroll compressor according to any one of claims 1 to 8. A scroll compressor according to any one of claims 1 to 9,
An air conditioner (1) comprising: An assembly method for assembling the scroll compressor according to claim 4,
Installing the fixed scroll on the body (21) of the casing;
Inserting the first suction pipe into the suction connection port provided in the fixed scroll;
Inserting the second suction pipe until it is locked to the locking portion of the first suction pipe;
Brazing the expanded portion of the second suction pipe and the inlet end of the first suction pipe;
Fitting the lid portion (22a) of the casing to the body portion through the second suction pipe;
An assembly method comprising:

Images