JP7645698B2 - Compressor - Google Patents

Description

This disclosure relates to a compressor.

For example, Patent Document 1 discloses a compressor that includes a fixed scroll fixed in a cylindrical housing, an orbiting scroll that revolves around the fixed scroll within the housing, and a discharge pipe that discharges refrigerant compressed in a compression chamber formed between the fixed scroll and the orbiting scroll to the outside of the housing. In this compressor, a dome-shaped discharge cover is provided within the housing to cover the compressor. The discharge pipe extends in a direction perpendicular to the axis of the housing and penetrates the top cover and the discharge cover of the housing.

Patent No. 5285455

However, in the compressor described in Patent Document 1, during assembly, the discharge pipe must be passed through a hole formed in the top cover of the housing and a cylindrical portion provided in the discharge cover. Therefore, unless the hole in the top cover and the cylindrical portion of the discharge cover are coaxially positioned with high positional accuracy when the top cover is attached, it may be difficult to insert (press-fit) the discharge pipe.

This disclosure has been made to solve the above problems, and aims to provide a compressor that can be easily assembled.

In order to solve the above problems, the compressor according to the present disclosure comprises a cylindrical housing extending in the axial direction and having an opening on a side, a suction pipe that draws refrigerant into the housing, and a discharge pipe that discharges the refrigerant compressed in the scroll compression section inside the housing to the outside of the housing, the discharge pipe having a straight discharge pipe body that penetrates the opening and extends radially from inside the housing to the outside of the housing, and the inner circumferential surface of the opening is separated from the opening opposing portion of the outer circumferential surface of the discharge pipe body that faces the inner circumferential surface.

The compressor disclosed herein can improve assembly. In addition, the discharge pipe, which is exposed to high temperatures and pressures, does not have residual stress associated with bending and other processes, which is advantageous in terms of pressure resistance.

FIG. 2 is a cross-sectional view of a compressor according to an embodiment of the present disclosure. FIG. 2 is an enlarged cross-sectional view showing a configuration of a discharge pipe of a compressor according to an embodiment of the present disclosure.

<Embodiment>
(Compressor configuration)
Hereinafter, a compressor according to an embodiment of the present disclosure will be described with reference to FIGS. 1 and 2. FIG.
As shown in FIG. 1 , the compressor 10 compresses the refrigerant drawn into the housing 11 through a suction pipe 18 , and discharges the refrigerant to the outside of the housing 11 through a discharge pipe 50 .
The compressor 10 has a scroll compression section 30 within a housing 11 .
The compressor 10 may include a scroll compression section 30 and a rotary compression section 20 within a housing 11 .
In this embodiment, the compressor 10 is a hermetic two-stage compressor including a scroll compression section 30 and a rotary compression section 20 .
The compressor 10 compresses, for example, carbon dioxide (CO ₂ ) as a refrigerant.
The compressor 10 may compress a refrigerant other than carbon dioxide.

The compressor 10 includes a housing 11, a rotating shaft 15, a rotary compression section 20, a scroll compression section 30, an electric motor 40, an intake pipe 18, and a discharge pipe 50.

(Housing Configuration)
The housing 11 forms the outer shell of the compressor 10 .
The housing 11 extends in an axial direction Da.
The housing 11 may be provided with the axial direction Da aligned along the up-down direction.
The housing 11 may be formed into a cylindrical shape as a whole.
The housing 11 includes a housing body 12 , a top cover 13 , and a bottom cover 14 .
The housing 11 defines an internal space 11S extending in the axial direction Da.

The housing body 12 is formed in a cylindrical shape extending in the axial direction Da.
A suction pipe connection opening 12h is formed in the lower part of the housing body 12. A suction pipe 18 is connected to the suction pipe connection opening 12h.
The suction pipe 18 draws the refrigerant into the housing 11 .
The suction pipe 18 draws in the refrigerant from the outside of the housing 11 .
The refrigerant sucked into the housing 11 through the suction pipe 18 is compressed in two stages by the rotary compression section 20 and the scroll compression section 30 .

The top cover 13 is provided on the upper part of the housing body 12 .
The top cover 13 closes an opening on one side of the housing body 12 in the axial direction Da.
For example, the top cover 13 integrally includes a cylindrical portion 13a and a curved portion 13b.
The tubular portion 13a is formed in a cylindrical shape extending in the axial direction Da.
The lower end of the cylindrical portion 13 a is joined to the upper end of the housing body 12 .
The curved portion 13b is provided contiguous to the upper end of the cylindrical portion 13a.
The curved portion 13b is curved so as to be convex upward.
The curved portion 13b closes the upper portion of the cylindrical portion 13a.

The top cover 13 has an opening 19 .
The opening 19 is formed in, for example, the cylindrical portion 13a.
The opening 19 penetrates the cylindrical portion 13a in the radial direction Dr. That is, the housing 11 has the opening 19 on its side surface.

The bottom cover 14 is provided on the lower part of the housing body 12 .
The bottom cover 14 closes the opening on the other side of the housing body 12 in the axial direction Da.
A base member 16 is provided below the bottom cover 14 .
The base member 16 extends outward in a radial direction Dr intersecting the axial direction Da in the housing 11 .
When the compressor 10 is installed on a predetermined mounting object, the base member 16 is fixed to the predetermined mounting object.

(Configuration of Rotating Shaft)
The rotating shaft 15 is accommodated in the housing 11 .
The rotating shaft 15 extends in the axial direction Da within the housing 11 .
The rotating shaft 15 is supported by a bearing 17A and a bearing 17B so as to be rotatable about an axis along the axial direction Da.
The bearing 17A and the bearing 17B are spaced apart from each other in the axial direction Da.
The bearing 17A is provided on one side (upper side) of the rotating shaft 15 in the axial direction Da.
The bearing 17A is fixed to the inner surface of the housing body 12 .
The bearing 17B is provided on the other side (lower side) of the rotating shaft 15 in the axial direction Da.
The bearing 17B is fastened to a cylinder 23 constituting the rotary compression section 20 by bolts.

(Configuration of the rotary compression section)
The rotary compression section 20 is provided at the bottom inside the housing 11 .
The rotary compression section 20 is disposed below the electric motor 40 .
The rotary compression section 20 has a piston rotor 22 and a cylinder 23 .

The piston rotor 22 is provided at the other end of the rotating shaft 15 on the other side in the axial direction Da.
The piston rotor 22 is provided eccentrically in the radial direction Dr with respect to the central axis of the rotating shaft 15 .
The piston rotor 22 rotates eccentrically with respect to the central axis of the rotary shaft 15 in association with the rotation of the rotary shaft 15 .
The cylinder 23 accommodates the piston rotor 22 therein.
The piston rotor 22 rotates eccentrically within the cylinder 23 .

The rotary compression section 20 introduces the refrigerant drawn through a suction pipe 18 (described later) into a cylinder 23 .
The rotary compression section 20 compresses the refrigerant by rotating a piston rotor 22 within a cylinder 23 .
The rotary compression section 20 discharges the compressed refrigerant through a discharge hole (not shown) into an internal space 11S of the housing 11, which is kept at an intermediate pressure.

(Configuration of Scroll Compressor)
The scroll compression section 30 is provided at an upper portion within the housing 11 .
The scroll compression section 30 is disposed above the electric motor 40 .
The scroll compression section 30 has a fixed scroll 31 and an orbiting scroll 32 .

The fixed scroll 31 is fixed to the upper surface of the bearing 17A.
The fixed scroll 31 has a spiral-shaped fixed wrap 31r that protrudes downward.

The orbiting scroll 32 is disposed below the fixed scroll 31 and facing the fixed scroll 31 .
The orbiting scroll 32 is provided eccentrically in the radial direction Dr at one end (upper end) of the rotating shaft 15 in the axial direction Da. As a result, the orbiting scroll 32 rotates eccentrically in conjunction with the rotation of the rotating shaft 15.
The orbiting scroll 32 revolves relative to the fixed scroll 31 .

The orbiting scroll 32 has an orbiting wrap 32r that protrudes upward.
The orbiting wrap 32 r of the orbiting scroll 32 meshes with the fixed wrap 31 r of the fixed scroll 31 .
A compression chamber 34 is formed between the orbiting wrap 32 r of the orbiting scroll 32 and the fixed wrap 31 r of the fixed scroll 31 .

The scroll compression section 30 draws refrigerant from the internal space 11S into the compression chamber 34 through a suction hole (not shown). The refrigerant drawn into the compression chamber 34 is compressed by the orbiting scroll 32 that revolves around the fixed scroll 31. The compressed refrigerant is discharged to the upper side of the fixed scroll 31 through a discharge hole 35 formed in the fixed scroll 31.

A discharge cover 39 is provided above the fixed scroll 31 .
The discharge cover 39 is accommodated in the upper part of the housing 11 .
The discharge cover 39 is disposed between the top cover 13 and the scroll compression section 30 .
The discharge cover 39 is fixed to the fixed scroll 31 by bolts or the like.

A discharge space 39S is formed between the discharge cover 39 and the fixed scroll 31 .
The discharge space 39S is a space separated from the internal space 11S and does not communicate with the internal space 11S.
In the discharge space 39S, high-pressure refrigerant compressed in the scroll compression section 30 is discharged from the discharge hole 35. That is, the discharge space 39S forms a high-pressure region H.

(Configuration of electric motor)
The electric motor 40 is disposed in the middle of the housing 11 in the up-down direction.
The electric motor 40 has a rotor 41 and a stator 42 .
The rotor 41 is fixed to the outer surface of the rotating shaft 15 .
The rotor 41 is disposed between the bearing 17A and the bearing 17B in the axial direction Da.

The stator 42 is disposed outside the rotor 41 in the radial direction Dr so as to surround the outer surface of the rotor 41 .
The stator 42 is fixed to the inner surface of the housing body 12 of the housing 11 .
The stator 42 is connected to a power source via wiring (not shown).
The electric motor 40 rotates the rotating shaft 15 using electric power from a power source.

(Configuration of the discharge pipe)
The discharge pipe 50 discharges the refrigerant compressed in the scroll compression section 30 inside the housing 11 to the outside of the housing 11 .
In this embodiment, the discharge pipe 50 discharges the high-pressure refrigerant compressed in two stages by the rotary compression section 20 and the scroll compression section 30 to the outside of the housing 11 .
The discharge pipe 50 is disposed at the upper part of the housing 11 .
The discharge pipe 50 passes through the top cover 13 and the discharge cover 39 .
One end of the discharge pipe 50 communicates with the discharge space 39S.
The other end of the discharge pipe 50 opens toward the outside of the housing 11 .

As shown in FIG. 2 , the discharge pipe 50 includes a discharge pipe main body 51 and an outer pipe 52 .
The discharge pipe body 51 has a straight pipe shape that penetrates the opening 19 and extends in the radial direction Dr of the housing 11 from inside the housing 11 to outside the housing 11 .
The base end 51 b of the discharge pipe body 51 is fixed to a through hole 39 h formed in the discharge cover 39 .
For example, the base end portion 51b of the discharge pipe main body 51 may be, for example, press-fitted into the through hole 39h.
For example, the base end 51b of the discharge pipe body 51 may be joined to the through hole 39h by brazing or welding.
A tip portion 51s of the discharge pipe body 51 protrudes outward in the radial direction Dr from the outer surface of the housing 11.

The outer diameter of the outer circumferential surface 51 g of the discharge pipe body 51 is smaller than the inner diameter of the opening 19 by a predetermined dimension.
An opening facing portion 51d of an outer circumferential surface 51g of the discharge pipe body 51 facing an inner circumferential surface 19f of the opening 19 is separated from the inner circumferential surface 19f of the opening 19.
The opening facing portion 51 d of the discharge pipe body 51 and the inner circumferential surface 19 f of the opening 19 are spaced apart from each other by a predetermined distance in the pipe diameter direction of the discharge pipe body 51 .

The outer tube 52 has one end 52 a fixed to the opening 19 .
For example, one end 52 a of the outer tube 52 may be press-fitted into the opening 19 .
For example, one end 52a of the outer tube 52 may be joined to the opening 19 by brazing, welding, or the like.
The outer tube 52 has a straight tube shape and extends outward in the radial direction Dr from the housing 11 .
The outer diameter of the discharge pipe body 51 is smaller than the inner diameter of the outer pipe 52 .
The discharge pipe body 51 is inserted inside the outer pipe 52 .
The tip 51s of the discharge pipe main body 51 is disposed at the same position as the tip 52s of the outer pipe 52 in the radial direction Dr of the housing 11, or is disposed further inward than the tip 52s in the radial direction Dr of the housing 11. In other words, the tip 51s of the discharge pipe main body 51 does not protrude outward in the radial direction Dr of the housing 11 relative to the tip 52s of the outer pipe 52.

The outer pipe 52 and the discharge pipe body 51 may be joined together by brazing, for example.
As a result, the brazing material W is interposed between the inner surface of the outer pipe 52 and the outer circumferential surface 51 g of the discharge pipe body 51 .
The brazing material W is provided continuously at least from the tip portion 51s of the discharge pipe main body 51 to the opening facing portion 51d.

In this manner, the base end 51 b of the discharge pipe body 51 is fixed to the through hole 39 h of the discharge cover 39 , and the tip end 51 s is fixed to the opening 19 via the outer pipe 52 .
The middle portion of the discharge pipe body 51 is exposed to the space 11 m between the housing 11 and the discharge cover 39 .

For example, the connecting pipe member 53 may be connected to the inside of the tip portion 51 s of the discharge pipe main body 51 .
For example, the connecting pipe member 53 may be inserted inside the tip portion 51 s of the discharge pipe main body 51 .
For example, the connecting pipe member 53 may be press-fitted into the tip portion 51 s of the discharge pipe main body 51 .
For example, the connecting pipe member 53 may be joined to the tip portion 51s of the discharge pipe body 51 by brazing or welding.
The connecting pipe member 53 connects an external pipe to the compressor 10 .
A portion of the connecting pipe member 53 protrudes outward in the radial direction Dr of the housing 11 beyond the tip end 51 s of the discharge pipe main body 51 .
The connecting pipe member 53 has an enlarged diameter portion 53 d at a portion that protrudes outward in the radial direction Dr of the housing 11 beyond the tip end portion 51 s of the discharge pipe main body 51 .
An external pipe can be connected to the expanded diameter portion 53d.
The connection pipe member 53 has a thickness greater than that of the discharge pipe main body 51 .

When assembling the compressor 10, for example, an operator first attaches the discharge pipe body 51 to the through hole 39h of the discharge cover 39 through the opening 19. At this time, the outer pipe 52 is not attached to the opening 19. The inner diameter of the opening 19 is larger than the outer diameter of the discharge pipe body 51. Therefore, the inner circumferential surface 19f of the opening 19 and the opening opposing portion 51d of the outer circumferential surface 51g of the discharge pipe body 51 that faces the inner circumferential surface 19f of the opening 19 are separated in the pipe diameter direction of the discharge pipe body 51. Therefore, the operator can easily attach the discharge pipe body 51 to the through hole 39h of the discharge cover 39 through the opening 19.
Thereafter, the worker attaches the outer pipe 52 to the opening 19 .
Furthermore, the worker joins the outer pipe 52 and the discharge pipe body 51 by brazing.
For example, the worker may then connect the connecting pipe member 53 to the tip portion 51 s of the discharge pipe main body 51 .

(Action and Effects)
According to the compressor 10 of this embodiment, the discharge pipe 50 passes through the opening 19 provided on the side surface of the housing 11. An inner peripheral surface 19f of the opening 19 and an opening facing portion 51d of the discharge pipe main body 51 are spaced apart. In this configuration, if the discharge pipe 50 is fixed to the opening 19 after passing through the opening 19, the discharge pipe 50 can be easily inserted into the opening 19. This improves the assembly of the compressor 10. In addition, compared to a structure in which the discharge pipe is inserted axially from the upper surface of the housing 11 and then bent radially, no residual stress accompanying processing such as bending is generated in the discharge pipe exposed to high temperature and high pressure, which is advantageous in terms of pressure resistance.

In addition, according to one example of this embodiment, the outer diameter of the outer peripheral surface 51g is smaller than the inner diameter of the inner peripheral surface 19f. This separates the inner peripheral surface 19f of the opening 19 from the opening opposing portion 51d of the outer peripheral surface 51g of the discharge pipe main body 51 that faces the inner peripheral surface 19f of the opening 19, forming a gap between the opening 19 and the discharge pipe main body 51.

According to one example of this embodiment, the discharge pipe 50 further includes an outer pipe 52 having one end fixed to the opening 19 and extending outward in the radial direction Dr of the housing 11 .
According to this configuration, the discharge pipe main body 51 is inserted inside the outer pipe 52. Outside the outer peripheral surface 51g of the housing 11 in the radial direction Dr, the discharge pipe 50 has a double structure in which the outer pipe 52 is provided outside the discharge pipe main body 51. This makes it possible to increase the thickness of the discharge pipe 50, which is the combination of the discharge pipe main body 51 and the outer pipe 52, and to increase the pressure resistance of the discharge pipe 50 outside the radial direction Dr of the housing 11.
Also, one end of the outer pipe 52 is fixed, and the discharge pipe body 51 is positioned inside it. As a result, a part of the gap between the inner circumferential surface 19f of the opening 19 and the opening facing portion 51d of the outer circumferential surface 51g of the discharge pipe body 51 facing the inner circumferential surface 19f of the opening 19 can be formed (filled) by the outer pipe 52 made of a rigid body. As a result, compared to a structure in which the gap between the inner circumferential surface 19f of the opening 19 and the opening facing portion 51d of the discharge pipe body 51 is filled with, for example, a sealant or the like, the discharge pipe body 51 can be fixed more firmly to the opening 19. As a result, it is possible to suppress the concentration of stress on the discharge pipe body 51.
Furthermore, by providing the outer pipe 52, the gap between the inner circumferential surface 19f of the opening 19 and the opening facing portion 51d of the discharge pipe main body 51 can be made larger. This allows the inner diameter of the opening 19 to be made larger than the outer diameter of the discharge pipe main body 51. This makes it easier for the worker to insert the discharge pipe main body 51 into the opening 19 when assembling the compressor 10.
Furthermore, by joining the outer pipe 52 and the discharge pipe body 51 at the portion where the discharge pipe body 51 is inserted inside the outer pipe 52, it is possible to ensure a long joining region between the outer pipe 52 and the discharge pipe body 51 in the extension direction of the discharge pipe body 51. Therefore, the discharge pipe body 51 is firmly joined to the housing 11 via the outer pipe 52.

According to one example of the present embodiment, in the compressor 10 , the brazing material W is interposed between the outer pipe 52 and the discharge pipe main body 51 .
This allows the outer pipe 52 and the discharge pipe body 51 to be firmly joined together.
In addition, by sealing the gap between the outer tube 52 and the discharge pipe main body 51 with brazing material W, the sealing property and pressure resistance of the gap between the outer tube 52 and the discharge pipe main body 51 can be improved compared to a configuration in which the gap is sealed with a sealing material or the like.

According to one example of the present embodiment, the brazing material W is provided at least from the tip portion 51 s of the discharge pipe main body 51 to the opening facing portion 51 d of the discharge pipe main body 51 .
This ensures that the joining region for joining the outer tube 52 and the discharge pipe body 51 by brazing is long along the extension direction of the discharge pipe body 51. Therefore, the discharge pipe body 51 is firmly fixed.

According to one example of this embodiment, the tip portion 51s of the discharge pipe main body 51 is disposed at the same position in the radial direction Dr of the housing 11 or on the inner side in the radial direction Dr of the housing 11 relative to the tip 52s of the outer pipe 52.
As a result, the tip 51s of the discharge pipe main body 51 does not protrude outward in the radial direction Dr of the housing 11 from the tip 52s of the outer pipe 52. As a result, the discharge pipe main body 51 has a double structure in which the outer pipe 52 is provided on the outside of the discharge pipe main body 51 in a portion that is radially outward from the outer surface of the housing 11 in the radial direction Dr, and high pressure resistance can be ensured.

According to one example of this embodiment, the middle portion of the discharge pipe body 51 is exposed to the space 11 m between the housing 11 and the discharge cover 39 .
Within the housing 11, a discharge space 39S facing the scroll compression section 30 inside the discharge cover 39 becomes a high-pressure region H where the pressure is higher than the atmosphere outside the housing 11. Also, within the housing 11, a space 11m between the housing 11 and the discharge cover 39 becomes an intermediate-pressure region M where the pressure is higher than the atmosphere outside the housing 11 and lower than the pressure of the discharge space 39S inside the discharge cover 39. In other words, the intermediate portion of the discharge pipe main body 51 is exposed to the intermediate-pressure region M between the inner surface of the housing 11 and the outer circumferential surface of the discharge cover 39. Therefore, it is not necessary to expose the discharge pipe main body 51 to the high-pressure region H, and the wall thickness can be made thin.

According to one example of the present embodiment, in the compressor 10 , the connecting pipe member 53 having a thickness greater than that of the discharge pipe main body 51 is connected to the tip portion 51 s side of the discharge pipe main body 51 .
In this manner, an external pipe can be connected to the connecting pipe member 53 connected to the tip 51s of the discharge pipe main body 51. High-pressure refrigerant discharged from inside the housing 11 flows through the connecting pipe member 53. For this reason, in the portion of the connecting pipe member 53 that protrudes outward in the radial direction Dr of the housing 11 beyond the tip 51s of the discharge pipe main body 51, the pressure difference between inside the connecting pipe member 53, through which the high-pressure refrigerant flows, and the outside of the connecting pipe member 53, which is exposed to the atmosphere, becomes large. By making the wall thickness of the connecting pipe member 53 thicker than the discharge pipe main body 51, the pressure resistance of the connecting pipe member 53 can be ensured.

According to one example of the present embodiment, the compressor 10 compresses the refrigerant in two stages, that is, in the rotary compression section 20 and the scroll compression section 30 .
As a result, the compressor 10 constitutes a two-stage compressor. The pressure of the refrigerant discharged from the compressor 10 having such a configuration is high. Therefore, with the above-mentioned configuration, the effectiveness of the compressor 10 is improved by improving the ease of assembly and providing the discharge pipe 50 with high pressure resistance.

According to one example of the present embodiment, the refrigerant is carbon dioxide.
In this way, when the refrigerant to be compressed is carbon dioxide, high pressure resistance is required for the compressor 10. In response to this, the compressor 10 having the above-mentioned configuration is particularly suitable.

<Additional Notes>
The compressor 10 according to the embodiment can be understood, for example, as follows.

(1) The compressor 10 according to the first aspect includes a cylindrical housing 11 extending in the axial direction Da and having an opening 19 on the side, a suction pipe 18 that draws refrigerant into the housing 11, and a discharge pipe 50 that discharges the refrigerant compressed by the scroll compression section 30 in the housing 11 to the outside of the housing 11. The discharge pipe 50 includes a straight discharge pipe body 51 that penetrates the opening 19 and extends from inside the housing 11 to the outside of the housing 11 in the radial direction Dr of the housing 11, and the inner circumferential surface 19f of the opening 19 is separated from the opening opposing portion 51d of the outer circumferential surface 51g of the discharge pipe body 51 that faces the inner circumferential surface 19f.

In this compressor 10, the discharge pipe 50 passes through an opening 19 provided on the side of the housing 11. The inner circumferential surface 19f of the opening 19 is separated from an opening opposing portion 51d of the outer circumferential surface 51g of the discharge pipe main body 51, which faces the inner circumferential surface 19f of the opening 19. In this configuration, if the discharge pipe 50 is fixed to the opening 19 after passing through the opening 19, the discharge pipe 50 can be easily inserted into the opening 19. Therefore, the assembly of the compressor 10 can be improved.

(2) The compressor 10 according to the second aspect is the compressor 10 of (1), in which the outer diameter of the outer peripheral surface 51g is smaller than the inner diameter of the inner peripheral surface 19f.

In this way, by making the outer diameter of the outer peripheral surface 51g of the discharge pipe body 51 smaller than the inner diameter of the inner peripheral surface 19f of the opening 19, the inner peripheral surface 19f of the opening 19 and the opening opposing portion 51d of the outer peripheral surface 51g of the discharge pipe body 51 that faces the inner peripheral surface 19f of the opening 19 can be separated.

(3) The compressor 10 according to a third aspect is the compressor 10 according to (1) or (2), wherein the discharge pipe 50 is
The discharge pipe further includes an outer pipe 52 having one end fixed to the opening 19, extending outward in the radial direction Dr of the housing 11, and having the discharge pipe main body 51 inserted therein.

According to this configuration, the discharge pipe main body 51 is inserted inside the outer pipe 52. Outside the outer peripheral surface 51g of the housing 11 in the radial direction Dr, a double structure is formed in which the outer pipe 52 is provided outside the discharge pipe main body 51. This makes it possible to increase the thickness of the discharge pipe 50, which is the combination of the discharge pipe main body 51 and the outer pipe 52, and to increase the pressure resistance of the discharge pipe 50 outside the radial direction Dr of the housing 11.
In addition, one end of the outer pipe 52 is fixed, and the discharge pipe main body 51 is positioned inside the outer pipe 52, so that a part of the gap between the inner peripheral surface 19f of the opening 19 and the opening facing portion 51d of the outer peripheral surface 51g of the discharge pipe main body 51 that faces the inner peripheral surface 19f of the opening 19 can be formed (filled) by the outer pipe 52 made of a rigid body. As a result, the discharge pipe main body 51 can be fixed more firmly to the opening 19 compared to a structure in which the gap between the inner peripheral surface 19f of the opening 19 and the opening facing portion 51d of the outer peripheral surface 51g of the discharge pipe main body 51 that faces the inner peripheral surface 19f of the opening 19 is filled with, for example, a sealant or the like. As a result, it is possible to suppress the concentration of stress on the discharge pipe main body 51.
Furthermore, by providing the outer pipe 52, it is possible to increase the gap between the inner circumferential surface 19f of the opening 19 and the opening opposing portion 51d of the outer circumferential surface 51g of the discharge pipe main body 51 that faces the inner circumferential surface 19f of the opening 19. This allows the inner diameter of the opening 19 to be greater than the outer diameter of the discharge pipe main body 51. This makes it even easier to insert the discharge pipe main body 51 into the opening 19 when assembling the compressor 10.
Furthermore, by joining the outer pipe 52 and the discharge pipe body 51 at the portion where the discharge pipe body 51 is inserted inside the outer pipe 52, it is possible to ensure a long joining region between the outer pipe 52 and the discharge pipe body 51 in the extension direction of the discharge pipe body 51. Therefore, the discharge pipe body 51 is firmly joined to the housing 11 via the outer pipe 52.

(4) The compressor 10 according to the fourth aspect is the compressor 10 according to (3), in which the outer diameter of the discharge pipe body 51 is smaller than the inner diameter of the outer pipe 52, and a brazing material W is interposed between the inner circumferential surface 19f of the outer pipe 52 and the outer circumferential surface 51g of the discharge pipe body 51.

In this manner, by interposing the brazing material W between the inner peripheral surface of the outer tube 52 and the outer peripheral surface 51g of the discharge pipe body 51, the outer tube 52 and the discharge pipe body 51 can be firmly joined together.
Furthermore, by sealing the gap between the outer tube 52 and the discharge pipe main body 51 with brazing material W, the sealing property and pressure resistance of the gap between the outer tube 52 and the discharge pipe main body 51 can be improved compared to a configuration in which the gap is sealed with a sealing material or the like.

(5) The compressor 10 according to the fifth aspect is the compressor 10 according to (4), in which the brazing material W is provided at least from the tip 51s of the discharge pipe body 51 to the opening facing portion 51d where the outer peripheral surface 51g of the discharge pipe body 51 faces the inner peripheral surface 19f of the opening 19.

This ensures that the joining area for joining the outer tube 52 and the discharge pipe body 51 by brazing is long along the extension direction of the discharge pipe body 51. Therefore, the discharge pipe body 51 is firmly fixed.

(6) The compressor 10 according to the sixth aspect is any one of the compressors 10 according to (3) to (5), in which the tip 51s of the discharge pipe main body 51 is positioned at the same position in the radial direction Dr of the housing 11 as the tip 52s of the outer pipe 52, or on the inside in the radial direction Dr of the housing 11.

As a result, the tip 51s of the discharge pipe body 51 does not protrude from the tip 52s of the outer pipe 52 outward in the radial direction Dr of the housing 11. As a result, the discharge pipe body 51 has a double structure in which the outer pipe 52 is provided on the outside of the discharge pipe body 51 in the portion radially outward of the outer surface of the housing 11 in the radial direction Dr, ensuring high pressure resistance.

(7) The compressor 10 according to the seventh aspect is any one of the compressors 10 according to (1) to (6), in which the base end 51b of the discharge pipe body 51 is fixed to a through hole 39h formed in a discharge cover 39 that covers the scroll compression section 30 provided in the housing 11, and the middle part of the discharge pipe body 51 is exposed to the space 11m between the housing 11 and the discharge cover 39.

As a result, within the housing 11, the portion inside the discharge cover 39 facing the scroll compression section 30 becomes a high-pressure region H compared to the atmosphere outside the housing 11. Also, within the housing 11, the space 11m between the housing 11 and the discharge cover 39 becomes an intermediate-pressure region M where the pressure is higher than the atmosphere outside the housing 11 and lower than the pressure inside the discharge cover 39. In other words, the middle portion of the discharge pipe main body 51 is exposed to the intermediate-pressure region M between the inner surface of the housing 11 and the outer peripheral surface of the discharge cover 39. Therefore, there is no need to expose the discharge pipe main body 51 to the high-pressure region H, and the wall thickness can be made thin.

(8) The compressor 10 according to an eighth aspect is the compressor 10 according to any one of (1) to (7), further comprising: a connecting pipe member 53 to which an external piping is connected is connected to an inside of the tip portion 51s of the discharge pipe main body 51;
The connection pipe member 53 has a thickness greater than that of the discharge pipe main body 51 .

In this way, an external pipe can be connected to the connecting pipe member 53 connected to the tip 51s of the discharge pipe main body 51. High-pressure refrigerant discharged from inside the housing 11 flows inside the connecting pipe member 53. For this reason, at the portion of the connecting pipe member 53 that protrudes outward in the radial direction Dr of the housing 11 beyond the tip 51s of the discharge pipe main body 51, the pressure difference between inside the connecting pipe member 53, where the high-pressure refrigerant flows, and outside the connecting pipe member 53, which is exposed to the atmosphere, becomes large. By making the thickness of the connecting pipe member 53 thicker than the discharge pipe main body 51, the pressure resistance of the connecting pipe member 53 can be ensured.

(9) The compressor 10 according to the ninth aspect is any one of the compressors 10 according to (1) to (8), further comprising a rotary compression section 20 having a rotating scroll 32 of the scroll compression section 30 at one end, a rotating shaft 15 extending in the axial direction Da within the housing 11, and a piston rotor 22 provided at the other end of the rotating shaft 15, and the refrigerant sucked into the housing 11 from the suction pipe 18 is compressed in two stages by the rotary compression section 20 and the scroll compression section 30.

As a result, the compressor 10 is a two-stage compressor that compresses the refrigerant in two stages using the rotary compression section 20 and the scroll compression section 30. The pressure of the refrigerant discharged from the compressor 10 configured in this way is high. Therefore, the above-mentioned configuration improves assembly while providing a discharge pipe 50 with high pressure resistance, thereby increasing the effectiveness of the compressor 10.

(10) The compressor 10 according to the tenth aspect is any one of the compressors 10 according to (1) to (9), in which the refrigerant is carbon dioxide.

When the refrigerant to be compressed is carbon dioxide, the compressor 10 is required to have high pressure resistance. In this case, the compressor 10 having the configuration described above is particularly suitable.

10...Compressor 11...Housing 11S...Internal space 11m...Space 12...Housing body 12h...Suction pipe connection opening 13...Top cover 13a...Cylindrical portion 13b...Curved portion 14...Bottom cover 15...Rotary shaft 16...Base members 17A, 17B...Bearing 18...Suction pipe 19...Opening 19f...Inner peripheral surface 20...Rotary compression section 22...Piston rotor 23...Cylinder 30...Scroll compression section 31...Fixed scroll 32... Orbiting scroll 34...compression chamber 35...discharge hole 39...discharge cover 39S...discharge space 39h...through hole 40...electric motor 41...rotor 42...stator 50...discharge pipe 51...discharge pipe main body 51b...base end 51d...opening opposing portion 51g...outer peripheral surface 51s...tip portion 52...outer tube 52a...one end 52s...tip 53...connecting pipe member 53d...expanded diameter portion Da...axial direction Dr...radial direction H...high pressure region M...intermediate pressure region W...brazing material

Claims (7)

a cylindrical housing extending in an axial direction and having an opening on a side surface;
a suction pipe for drawing a refrigerant into the housing;
a discharge pipe that discharges the refrigerant compressed in the scroll compression section in the housing to the outside of the housing,
The discharge pipe is
a straight discharge pipe body that passes through the opening and extends in a radial direction of the housing from inside the housing to outside the housing ;
the discharge pipe includes an outer pipe having an end fixed to the opening and extending radially outward from the housing, and into which the discharge pipe body is inserted;
An inner circumferential surface of the opening and an opening facing portion of an outer circumferential surface of the discharge pipe main body that faces the inner circumferential surface are spaced apart from each other ,
The outer diameter of the discharge pipe body is smaller than the inner diameter of the outer pipe,
A brazing material is interposed between an inner peripheral surface of the outer tube and an outer peripheral surface of the discharge pipe body,
The brazing material is provided at least from a tip portion of the discharge pipe body to an opening facing portion where an outer circumferential surface of the discharge pipe body faces an inner circumferential surface of the opening.
Compressor. The compressor according to claim 1 , wherein an outer diameter of the outer peripheral surface is smaller than an inner diameter of the inner peripheral surface of the opening . The compressor according to claim 1 or 2 , wherein a tip end of the discharge pipe body is disposed at the same position in a radial direction of the housing as a tip end of the outer pipe, or on a radial inner side of the housing. The base end of the discharge pipe body is fixed to a through hole formed in a discharge cover that covers the scroll compression section provided in the housing,
The compressor according to claim 1 , wherein a middle portion of the discharge pipe body is exposed in a space between the housing and the discharge cover. A connecting pipe member to which an external pipe is connected is connected to the inside of the tip of the discharge pipe body,
The compressor according to claim 1 , wherein the connecting pipe member has a thickness greater than that of the discharge pipe body. a rotating shaft having an orbiting scroll of the scroll compression section at one end and extending in the axial direction within the housing;
a rotary compression section having a piston rotor provided at the other end of the rotary shaft,
The compressor according to claim 1 , wherein the refrigerant sucked into the housing from the suction pipe is compressed in two stages by the rotary compression section and the scroll compression section. The compressor according to any one of claims 1 to 6 , wherein the refrigerant is carbon dioxide.

Images