JP2014129751A - Scroll compressor and scroll compressor assembly method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a scroll compressor having piping elements attached to a fixed scroll, and having high reliability with the improved sealability of the piping elements.SOLUTION: A scroll compressor 10 includes: a casing 20; a piping element assembly 30; and a fixed scroll 41. The piping element assembly includes: a plurality of piping elements (a suction pipe 31 and an injection pipe 32) connecting an interior of the casing to an exterior thereof; and a chamber cover 33 fixedly attached to the piping elements so that the piping elements protrude from an upper surface 33a thereof. The fixed scroll is stored within the casing, includes a spiral fixed-side lap 42 protruding from a lower surface 41a, and is coupled to the piping element assembly in a state in which an upper surface 41b is opposed to a lower surface 33b of a plate member.

Description

  The present invention relates to a scroll compressor and an assembly method of the scroll compressor.

  Conventionally, in a scroll compressor, a structure in which a pipe such as a suction pipe or an injection pipe is attached to a fixed scroll by sealing with an O-ring, or a structure in which a pipe is press-fitted and attached is known (for example, Patent Document 1). (Japanese Patent Laid-Open No. 2001-153072).

  However, the inventor of the present application has found that there are the following problems in the mounting structure between the fixed scroll and the pipe.

  When installing a pipe using an O-ring to the fixed scroll, the O-ring may be damaged when the pipe is installed, and the sealing performance of the pipe may be impaired. Careful so as not to damage the O-ring. It is necessary to perform piping installation work.

  Also, when installing the pipe by press-fitting it to the fixed scroll, dust may be generated due to squeezing during press-fitting, and the dust may damage the sliding part of the compressor. There is a need to do. Further, when the material of the fixed scroll and the pipe are different, the press-fitting allowance varies depending on the temperature due to the difference in linear expansion coefficient, which may adversely affect the sealing performance of the pipe.

  The subject of this invention is a scroll compressor by which piping is attached to a fixed scroll, Comprising: It is providing the highly reliable scroll compressor which improved the sealing performance of piping.

  A scroll compressor according to a first aspect of the present invention includes a casing, a pipe assembly, and a fixed scroll. The pipe assembly includes a plurality of pipes including suction pipes connecting the inside and the outside of the casing, and a plate member fixed so that the pipes protrude from the front surface. The fixed scroll is housed inside the casing, and the spiral fixed side wrap projects from the front surface, and is connected to the pipe assembly with the back surface facing the back surface of the plate member.

  Here, since a pipe assembly in which a plurality of pipes and plate members are integrated is used, it is possible to suppress the occurrence of a sealing failure as compared with pipe installation using an O-ring or pipe installation by press-fitting. Moreover, since the sliding part of a scroll compressor is not damaged by the dust generated at the time of pipe installation unlike the pipe installation by press fitting, the reliability of the compressor can be improved. That is, here, a highly reliable scroll compressor with improved piping sealing performance can be realized.

  The scroll compressor which concerns on the 2nd viewpoint of this invention is a scroll compressor which concerns on the 1st viewpoint of this invention, Comprising: A sealing material is further provided. The sealing material is disposed between the pipe assembly and the fixed scroll so as to be in close contact with the pipe assembly and the fixed scroll.

  Here, since the sealing material is provided between the fixed scroll and the pipe assembly, the gap between the fixed scroll and the plate member is sufficiently sealed. Further, unlike the O-ring, the sealing material is not directly attached to the pipe, and therefore, when the pipe and the joint are fixed by welding, the sealing material is not easily deteriorated by heat. As a result, a scroll compressor excellent in sealing performance can be realized.

  The scroll compressor which concerns on the 3rd viewpoint of this invention is a scroll compressor which concerns on the 1st viewpoint or the 2nd viewpoint of this invention, Comprising: A casing has multiple hollow joint parts which both ends opened. The pipe is inserted into the joint part and fixed to the joint part by welding. The joint portion has a contact surface in contact with the pipe on the inner surface of the end portion arranged outside the casing, and does not contact the pipe except for the contact surface.

  Here, since the joint portion does not contact the pipe, the pipe can be easily inserted into the joint portion, and the assemblability is good. The joint part has a contact surface that is in close contact with the pipe. However, since the joint part is in contact with the pipe only at the outer end of the casing, the joint part and the pipe can be easily brought into close contact by swaging after the pipe is inserted into the joint part. Can do.

  The scroll compressor which concerns on the 4th viewpoint of this invention is a scroll compressor which concerns on the 3rd viewpoint of this invention, Comprising: Welding is brazing.

  Here, the pipe and the joint can be joined quickly and easily by brazing.

  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 of the present invention, and further includes a movable scroll. A spiral movable side wrap protrudes from the front surface of the movable scroll. The fixed scroll and the movable scroll are engaged with each other by combining the fixed side wrap and the movable side wrap so that a compression chamber is formed by the fixed side wrap and the movable side wrap. The piping includes the first piping. A communication hole for communicating the compression chamber and the first pipe is formed in the fixed scroll. The inner diameter of the communication hole is larger than the inner diameter of the first pipe.

  Here, since the inner diameter of the communication hole is larger than the inner diameter of the first pipe, the communication hole and the first pipe are sufficiently communicated even if the mounting position of the pipe assembly is slightly shifted. Therefore, high accuracy is not required for processing of the communication hole and mounting of the pipe assembly, and processing and assembly are easy.

  The scroll compressor according to the sixth aspect of the present invention is the scroll compressor according to the fifth aspect of the present invention, wherein at least one of the communication holes has an opening for communicating the compression chamber and the first pipe. The opening member in which is formed is press-fitted. The inner diameter of the opening is larger than the inner diameter of the first pipe.

  Here, since the inner diameter of the opening is larger than the inner diameter of the first pipe, the opening and the first pipe are sufficiently communicated even if the mounting position of the pipe assembly is slightly deviated. Therefore, high accuracy is not required for attaching the opening member and the pipe assembly, and processing and assembly are easy.

  The assembly method of the scroll compressor which concerns on the 7th viewpoint of this invention has a 1st-5th process. In the first step, a pipe assembly including a plurality of pipes including a suction pipe and a plate member fixed so that the pipes protrude from the front surface, and a sealing material are fixed so that a spiral fixed side wrap protrudes from the front surface. The back surface of the plate member and the back surface of the fixed scroll are opposed to the scroll, and the seal material is connected in a state of being disposed between the pipe assembly and the fixed scroll. In the second step, the fixed scroll to which the pipe assembly and the seal material are coupled and the movable scroll from which the spiral movable wrap projects from the front are engaged so as to combine the fixed wrap and the movable wrap. The In the third step, a casing upper cover having a plurality of hollow joint portions open at both ends is put on the pipe assembly so as to insert the pipe into the joint portion. In the fourth step, the joint portion is subjected to a swaging process on the pipe. In the fifth step, the joint portion and the pipe are fixed by brazing.

  Here, the sealability can be confirmed at the time when the piping assembly and the fixed scroll are connected with the sealant sandwiched therebetween, and the occurrence of seal failure can be suppressed. Also, unlike the case where pipes are installed by press fitting, no dust is generated when the pipes are attached (when the pipe assembly and the fixed scroll are connected), so the sliding parts of the scroll compressor are not damaged, and the compressor Reliability can be improved.

  That is, here, the sealing performance of the piping and the reliability of the scroll compressor are improved as compared with the assembly method of the scroll compressor in which piping is attached using an O-ring and the assembly method of the scroll compressor in which piping is attached by press-fitting. be able to.

  Furthermore, since the pipe and the joint pipe are brazed after the swaging, the scroll compressor can be assembled even when the position accuracy of the pipe is poor.

  An assembly method for a scroll compressor according to an eighth aspect of the present invention is an assembly method for a scroll compressor according to the seventh aspect of the present invention, wherein in the third step, the largest outer diameter having the largest outer diameter in the pipe is provided. The diameter pipe is inserted into the joint portion corresponding to the maximum outer diameter pipe, and then pipes other than the maximum outer diameter pipe are respectively inserted into the corresponding joint portions.

  Here, by inserting the maximum outer diameter pipe into the joint portion first, other pipes can be easily inserted into the joint portion using the maximum outer diameter pipe as a guide. As a result, the assembling property of the scroll compressor can be improved.

  In the scroll compressor according to the present invention, since a pipe assembly in which a plurality of pipes and plate members are integrated is used, compared with pipe installation using an O-ring or pipe installation by press-fitting, there is a poor seal. Generation can be suppressed. Moreover, since the sliding part of a scroll compressor is not damaged by the dust generated at the time of pipe installation unlike the pipe installation by press fitting, the reliability of the compressor can be improved. That is, here, a highly reliable scroll compressor with improved piping sealing performance can be realized.

  In the method of assembling the scroll compressor according to the present invention, compared to the method of assembling the scroll compressor in which piping is attached using an O-ring and the method of assembling the scroll compressor in which piping is attached by press-fitting, the sealing performance of the piping and scroll compression The reliability of the machine can be improved.

It is a longitudinal section of a scroll compressor concerning one embodiment of the present invention. It is an enlarged view around the piping assembly of the scroll compressor of FIG. It is the top view which looked at the fixed scroll part of the scroll compressor of FIG. 1 from upper direction in the state which removed the piping assembly. It is a flowchart explaining the assembly process of the scroll compressor of FIG.

  An embodiment of a scroll compressor and a scroll compressor assembling method of the present invention will be described with reference to the drawings. Note that the following embodiments can be appropriately changed without departing from the gist of the present invention.

(1) Overall Overview The scroll compressor 10 shown in FIG. 1 constitutes a refrigerant circuit together with an evaporator, a condenser, an expansion mechanism, and the like, and plays a role of compressing refrigerant flowing in the refrigerant circuit.

  The scroll compressor 10 mainly includes a casing 20, a pipe assembly 30, a gasket 35, a fixed scroll 41, a movable scroll 44, and a housing 47, a compression mechanism 40, an electric motor 50, a crankshaft 60, and a lower bearing portion. 70.

(2) Detailed description Hereinafter, each part of this scroll compressor 10 is explained in full detail. In the following description, the direction of the arrow U in FIG.

(2-1) Casing The scroll compressor 10 has a vertically long cylindrical casing 20 as shown in FIG. The casing 20 includes a substantially cylindrical cylindrical member 21 that is open at the top and bottom, and an upper lid 22 and a lower lid 23 provided at the upper end and the lower end of the cylindrical member 21, respectively. The cylindrical member 21, and the upper lid 22 and the lower lid 23 are fixed by welding so as to maintain airtightness.

  The casing 20 accommodates components and components of the scroll compressor 10 including the pipe assembly 30, the gasket 35 (see FIG. 3), the compression mechanism 40, the electric motor 50, the crankshaft 60, and the lower bearing portion 70. . An oil reservoir space in which oil for lubricating the compression mechanism and the like is stored is formed in the lower portion of the casing 20.

  The upper lid 22 is a member formed in an elliptical shape as shown in FIGS. 1 and 2, and has cylindrical joint portions 24 and 25 having both ends opened at a plurality of locations (two locations in the present embodiment). The joint portions 24 and 25 are made of copper and extend upward from the upper surface of the upper lid 22 along the axial direction of a crankshaft 60 described later. In addition, the material of the joint parts 24 and 25 is an example, and is not limited to this. A suction pipe 31 of a pipe assembly 30 described later is inserted into a hollow part of the joint part 24, and an injection pipe 32 of a pipe assembly 30 described later is inserted into a hollow part of the joint part 25.

  Swaging processing is performed on the upper end portion of the joint portion 24 in a state where the suction pipe 31 is inserted. The swaging process is a process of reducing the outer diameter of the cylindrical member. More specifically, the outer diameter of the upper end portion of the joint portion 24 is reduced by swaging so that the inner surface of the joint portion 24 is in contact with the suction pipe 31 inserted into the joint portion 24. . And the joint part 24 has the contact surface 24a closely_contact | adhered with the outer surface of the suction pipe 31 in the upper end part of a hollow part inner surface. The inner diameter of the joint portion 24 is designed to be larger than the outer diameter of the suction pipe 31 so that the suction pipe 31 can be freely inserted. The joint portion 24 does not contact the suction pipe 31 except for the contact surface 24a. . The upper end portion of the joint portion 24 subjected to the swaging process is fixed to the suction pipe 31 by brazing. Brazing is an example of a welding method, and the joint portion 24 and the suction pipe 31 may be fixed by a welding method other than brazing.

  The upper end portion of the joint portion 25 is also subjected to swaging processing with the injection pipe 32 inserted. Specifically, the outer diameter of the upper end portion of the joint portion 25 is reduced by swaging so that the inner surface of the joint portion 25 is in contact with the injection pipe 32 inserted into the joint portion 25. And the joint part 25 has the contact surface 25a which contacts the outer surface of the injection pipe 32 in the upper end part of a hollow part inner surface. The inner diameter of the joint part 25 is designed to be larger than the outer diameter of the injection pipe 32 so that the injection pipe 32 can be inserted freely. The joint part 25 does not contact the injection pipe 32 except for the contact surface 25a. The upper end portion of the joint portion 25 subjected to the swaging process is fixed to the injection pipe 32 by brazing. Brazing is an example of a welding method, and the joint portion 25 and the injection pipe 32 may be fixed by a welding method other than brazing.

  A discharge pipe 26 through which the refrigerant discharged from the casing 20 passes is provided at an intermediate portion of the cylindrical member 21. More specifically, the discharge pipe 26 is disposed so that an end portion of the discharge pipe 26 in the casing 20 protrudes into a high-pressure space Sh formed below a housing 47 of the compression mechanism 40 described later.

(2-2) Piping Assembly A piping assembly 30 shown in FIG. 2 is a member in which a suction pipe 31, an injection pipe 32, and a chamber cover 33 are integrated. The suction pipe 31 and the injection pipe 32 are copper pipes. However, the materials of the suction pipe 31 and the injection pipe 32 are examples, and are not limited thereto.

  The chamber cover 33 is a member on a flat plate. The suction pipe 31 and the injection pipe 32 are fixed to the chamber cover 33 so as to protrude upward from the upper surface 33a (front surface). The suction pipe 31 and the injection pipe 32 are fixed to the chamber cover 33 by brazing. Brazing is an example of a fixing method and may be fixed by other methods. One end of each of the suction pipe 31 and the injection pipe 32 is open on the lower surface 33 b (back surface) side of the chamber cover 33.

  The chamber cover 33 is disposed so as to cover an upper portion of a concave portion 41e formed in an upper portion of a fixed scroll 41 described later. A muffler space Sm is formed between the chamber cover 33 and the recess 41e. The muffler space Sm functions as an expansion chamber that silences the operation sound of the compression mechanism 40. The muffler space Sm communicates with the high-pressure space Sh through a refrigerant passage 41g (see FIG. 3) formed in the fixed scroll 41 described later and a refrigerant passage (not shown) formed in the housing 47.

  A lower surface 33b of the chamber cover 33 faces an upper surface 41b (back surface) of a fixed scroll 41 described later. Between the upper surface 41b of the fixed scroll 41 and the lower surface 33b of the chamber cover 33, a gas refrigerant in the muffler space Sm is prevented from flowing out through a gap between the upper surface 41b and the lower surface 33b. A gasket 35 is disposed (see FIG. 3). The chamber cover 33 and the fixed scroll 41 are fixed by bolts (not shown).

  The suction pipe 31 is a pipe for supplying a gas refrigerant having a suction pressure (low pressure) to a compression chamber Sc of the compression mechanism 40 described later. The suction pipe 31 is inserted into the joint portion 24 of the upper lid 22 of the casing 20 and connects the inside and outside of the casing 20. The suction pipe 31 is fixed to the joint portion 24 by brazing. An opening on the lower surface 33b side of the chamber cover 33 of the suction pipe 31 is disposed so as to face an opening 81a at the upper end of a suction opening member 81 press-fitted into a fixed scroll 41 described later. The suction pipe 31 and the compression chamber Sc communicate with each other through the inside of the cylindrical suction opening member 81. The inner diameter of the suction pipe 31 is smaller than the inner diameter of the opening 81 a at the upper end of the suction opening member 81 facing the opening of the suction pipe 31.

  The injection pipe 32 is a pipe for introducing gas refrigerant or liquid refrigerant flowing through the refrigerant circuit into the compression chamber Sc of the compression mechanism 40. The injection pipe 32 is inserted into the joint portion 25 of the upper lid 22 of the casing 20 and connects the inside and outside of the casing 20. The injection pipe 32 is fixed to the joint portion 25 by brazing. The opening on the lower surface 33b side of the chamber cover 33 of the injection pipe 32 is disposed so as to face the second communication hole 41d formed in the fixed scroll 41. The injection pipe 32 and the compression chamber Sc communicate with each other through the second communication hole 41d. The inner diameter of the injection pipe 32 is smaller than the diameter of the second communication hole 41d.

(2-3) Gasket The gasket 35 is a sealing material for preventing the gas refrigerant from flowing out of the muffler space Sm through the gap between the chamber cover 33 and the fixed scroll 41 (FIGS. 2 and 3). reference).

  The gasket 35 is disposed between the chamber cover 33 and the fixed scroll 41 included in the pipe assembly 30. The upper surface of the gasket 35 is in close contact with the lower surface 33b of the chamber cover 33 and the lower surface thereof is in close contact with the upper surface 41b of the fixed scroll 41, thereby sealing the flow of the gas refrigerant.

  As shown in FIG. 3, the gasket 35 is formed in a ring shape so as to surround a recess 41 e of the fixed scroll 41 described later, and the muffler space Sm (see FIG. 2) communicates with the space outside the chamber cover 33. To prevent. Further, a substantially annular opening 35a is formed in the gasket 35 so as to surround an opening 81a formed in a suction opening member 81 press-fitted into the fixed scroll 41 described later (see FIG. 3). Furthermore, a substantially annular opening 35b is formed in the gasket 35 so as to surround the second communication hole 41d formed in the fixed scroll 41 (see FIG. 3). By surrounding the suction opening member 81 and the second communication hole 41d with the gasket 35, the muffler space Sm and the compression chamber Sc are prevented from communicating with each other through the inside of the suction opening member 81 and the second communication hole 41d. Is done. Note that the gasket 35 is not in direct contact with the suction pipe 31 and the injection pipe 32. A substantially annular opening 35 c is also formed in the gasket 35 around the bolt holes for fixing the pipe assembly 30 and the fixed scroll 41 so as to surround each bolt hole.

(2-4) Compression Mechanism As shown in FIG. 1, the compression mechanism 40 mainly includes a fixed scroll 41, a movable scroll 44, and a housing 47. A compression chamber Sc for compressing the refrigerant is formed between the fixed scroll 41 and the movable scroll 44.

(2-4-1) Fixed Scroll As shown in FIGS. 1 to 3, the fixed scroll 41 includes a spiral fixed side wrap 42 that protrudes from the lower surface 41 a (front surface) of the fixed scroll 41, and the fixed side wrap 42. And an outer edge portion 43 surrounding the.

  As shown in FIG. 2, the fixed scroll 41 has a first communication hole 41 c for communicating the suction pipe 31 and the compression chamber Sc. As shown in FIG. 2, a cylindrical suction opening member 81 whose upper and lower ends are opened is attached to the first communication hole 41c. The suction opening member 81 is a member made of an iron-based material. Specifically, the suction opening member 81 is press-fitted into the fixed scroll 41 (into the first communication hole 41 c) at a position where the upper opening 81 a faces the opening of the suction pipe 31 on the lower surface 33 b side of the chamber cover 33. Has been. The suction opening member 81 is press-fitted into the fixed scroll 41 so that the upper end surface of the suction opening member 81 is flush with the upper surface 41 b of the fixed scroll 41. The suction pipe 31 communicates with the compression chamber Sc disposed on the outermost periphery through the opening 81 a of the suction opening member 81 and the inside of the suction opening member 81.

  It should be noted that the opening 81 a at the upper end of the suction opening member 81 is inhaled so that the suction pipe 31 and the compression chamber Sc communicate with each other through the opening 81 a of the suction opening member 81 even if the attachment position of the suction pipe 31 is slightly shifted. It is formed larger than the inner diameter of the tube 31. Naturally, the inner diameter of the first communication hole 41 c into which the suction opening member 81 is press-fitted is formed larger than the inner diameter of the suction pipe 31.

  Below the suction opening member 81 of the fixed scroll 41, as shown in FIGS. 1 and 2, a suction passage 41h that connects the inside of the suction opening member 81 and the compression chamber Sc is formed. As shown in FIGS. 1 and 2, the suction passage 41 h is provided with a check valve 82 for preventing the refrigerant in the compression chamber Sc from flowing back to the suction pipe 31 when the scroll compressor 10 is stopped. ing.

  The check valve 82 has a valve main body 83 on a disc disposed above. The valve body 83 is pushed downward during operation of the scroll compressor 10, and the suction pipe 31 and the peripheral compression chamber Sc communicate with each other through the suction passage 41h. On the other hand, when the operation of the scroll compressor 10 is stopped, the valve main body 83 is pushed upward by a spring force (not shown) to close the opening 81 b at the lower end of the suction opening member 81. That is, the suction opening member 81 functions as a receiving portion that receives the valve body 83 of the check valve 82 at the lower end thereof. The valve body 83 is formed larger than the inner diameter of the opening 81b so that the opening 81b below the suction opening member 81 can be closed.

  A concave portion 41e is formed in the approximate center of the upper surface 41b of the fixed scroll 41 as shown in FIGS. A non-circular discharge port 41f that penetrates the fixed scroll 41 in the thickness direction and communicates with a compression chamber Sc described later is formed at the bottom of the recess 41e. The gas refrigerant compressed in the compression chamber Sc is discharged from the discharge port 41f to the muffler space Sm, passes through a refrigerant passage 41g formed in the fixed scroll 41 and a refrigerant passage (not shown) formed in the housing 47 described later, It flows into the high-pressure space Sh.

  The fixed scroll 41 is formed with a second communication hole 41d communicating with the compression chamber Sc in the middle of compression at a position facing the opening of the injection pipe 32 on the lower surface 33b side of the chamber cover 33 of the pipe assembly 30. . The second communication hole 41d is formed larger than the inner diameter of the injection pipe 32 so that the injection pipe 32 and the compression chamber Sc communicate with each other via the second communication hole 41d even if the attachment position of the injection pipe 32 is slightly shifted. Has been.

  The outer edge portion 43 is formed on the lower outer peripheral edge of the fixed scroll 41 and protrudes to the outer peripheral side over the entire periphery. The fixed scroll 41 is fixed to the housing 47 at the outer edge 43.

(2-4-2) Movable Scroll As shown in FIGS. 1 and 2, the movable scroll 44 includes a spiral movable side wrap 45 protruding from the upper surface 44 a (front surface) of the movable scroll 44, and the movable scroll 44. It protrudes from the lower surface 44b (rear surface) and has a boss portion 46 formed in a cylindrical shape.

  The fixed side wrap 42 of the fixed scroll 41 and the movable side wrap 45 of the movable scroll 44 are engaged in combination so that the lower surface 41a of the fixed scroll 41 and the upper surface 44a of the movable scroll 44 face each other, and are adjacent to the fixed side. A compression chamber Sc is formed between the wrap 42 and the movable side wrap 45.

  The boss portion 46 is a cylindrical portion whose upper end is blocked. An eccentric portion 61 of a crankshaft 60 described later is inserted into the boss portion 46, and the boss portion 46 and the eccentric portion 61 are connected.

  The movable scroll 44 is supported by a housing 47 described later via an Oldham joint (not shown). The Oldham coupling is a member that prevents the movable scroll 44 from rotating and revolves. When the crankshaft 60 with the eccentric portion 61 connected to the boss portion 46 rotates, the movable scroll 44 revolves without rotating with respect to the fixed scroll 41 by the Oldham joint, and the refrigerant in the compression chamber Sc is compressed.

(2-4-3) Housing The housing 47 is press-fitted into the cylindrical member 21 of the casing 20, and the entire outer peripheral surface of the housing 47 is fixed to the inner peripheral surface of the cylindrical member 21. An upper edge of the housing 47 is fixed with a bolt or the like (not shown) so that the outer edge 43 of the fixed scroll 41 is in close contact therewith.

  The housing 47 is formed with a substantially circular recess 47a in the upper center portion in plan view. Inside the recess 47a, the boss portion 46 of the movable scroll 44 to which the eccentric portion 61 of the crankshaft 60 is connected is accommodated.

  A substantially circular bearing 47b having a smaller diameter than the recess 47a is formed in the lower portion of the recess 47a. The main shaft 62 of the crankshaft 60 is inserted so as to penetrate the bearing portion 47b. The bearing portion 47b rotatably supports the main shaft 62.

(2-5) Electric motor The electric motor 50 drives the compression mechanism 40. As shown in FIG. 1, the electric motor 50 is rotatably accommodated with a substantially annular stator 51 fixed to the inner wall surface of the cylindrical member 21 of the casing 20 and a slight gap (air gap passage) inside the stator 51. Rotor 52 formed.

  The rotor 52 is connected to the movable scroll 44 via the crankshaft 60. As the rotor 52 rotates, the movable scroll 44 revolves with respect to the fixed scroll 41.

(2-6) Crankshaft The crankshaft 60 transmits the driving force of the electric motor 50 to the movable scroll 44. As shown in FIG. 1, the crankshaft 60 is disposed so as to extend in the vertical direction along the axial center of the cylindrical member 21 of the casing 20, and connects the rotor 52 of the electric motor 50 and the movable scroll 44 of the compression mechanism 40. To do.

  The crankshaft 60 has a main shaft 62 whose center axis coincides with the axis of the cylindrical member 21, and an eccentric portion 61 that is eccentric with respect to the axis of the cylindrical member 21.

  The eccentric portion 61 is disposed at the upper end of the main shaft 62 and is connected to the boss portion 46 of the movable scroll 44.

  The main shaft 62 is rotatably supported by a bearing portion 47b of the housing 47 and a lower bearing portion 70 described later. The main shaft 62 is connected to the rotor 52 of the electric motor 50 between the bearing portion 47 b and the lower bearing portion 70.

(2-7) Lower Bearing Part The lower bearing part 70 rotatably supports the main shaft 62 of the crankshaft 60. As shown in FIG. 1, the lower bearing portion 70 is disposed below the electric motor 50 and is fixed to the cylindrical member 21.

(3) Description of Operation of Scroll Compressor The operation of the scroll compressor 10 will be described with reference to FIG.

  When the electric motor 50 is driven, the crankshaft 60 rotates and the movable scroll 44 is driven. The movable scroll 44 revolves with respect to the fixed scroll 41 without rotating due to the action of the Oldham coupling.

  As the movable scroll 44 revolves, the volume of the compression chamber Sc of the compression mechanism 40 changes periodically. When the volume of the compression chamber Sc increases, a low-pressure gas refrigerant is supplied to the compression chamber Sc through the suction pipe 31. More specifically, when the volume of the compression chamber Sc on the outermost peripheral side increases, the low-pressure gas refrigerant supplied from the suction pipe 31 is inserted into the fixed scroll 41 and the suction opening member 81 and the suction passage. It is supplied to the compression chamber Sc on the outermost peripheral side via 41h. On the other hand, when the volume of the compression chamber Sc decreases, the gas refrigerant is compressed in the compression chamber Sc, and finally becomes a high-pressure gas refrigerant. The high-pressure gas refrigerant is discharged from a discharge port 41 f located near the center on the upper surface 41 b side of the fixed scroll 41. Thereafter, the refrigerant passes through a refrigerant passage 41g formed in the fixed scroll 41 and a refrigerant passage (not shown) formed in the housing 47, and flows into the high-pressure space Sh. The high-pressure gas refrigerant is finally discharged from the discharge pipe 26.

  In the scroll compressor 10, gas refrigerant or liquid refrigerant is injected from the economizer circuit, for example, into the compression chamber Sc being compressed via the injection pipe 32. More specifically, the gas refrigerant or liquid refrigerant supplied from the injection pipe 32 is supplied to the compression chamber Sc in the middle of compression through the second communication hole 41 d formed in the fixed scroll 41.

(4) Assembling method of scroll compressor The assembling method of the scroll compressor 10 mentioned above, especially the assembling method related to the piping assembly 30, the fixed scroll 41, the movable scroll 44, and the upper cover 22 of the casing 20 are demonstrated.

  As shown in FIG. 4, the assembly process related to the piping assembly 30, the fixed scroll 41, the movable scroll 44, and the upper cover 22 of the casing 20 of the scroll compressor 10 mainly includes the first to fifth processes. Become.

  In the first step, the pipe assembly 30 and the fixed scroll 41 are connected with the gasket 35 disposed on the upper surface 41b of the fixed scroll 41 as shown in FIG. More specifically, the lower surface 33 b of the chamber cover 33 of the piping assembly 30 and the upper surface 41 b of the fixed scroll 41 are opposed to each other, and the gasket 35 is sandwiched between the lower surface 33 b of the chamber cover 33 and the upper surface 41 b of the fixed scroll 41. In this state, the chamber cover 33 is fixedly connected to the fixed scroll 41 with bolts.

  At the end of the first step, it is possible to check the sealing performance to check whether the refrigerant leaks from the suction pipe 31 or the injection pipe 32 through the gap between the fixed scroll 41 and the chamber cover 33. That is, it is possible to check the sealing performance not with respect to the assembly of the entire scroll compressor 10 but with respect to the fixed scroll assembly in which the fixed scroll 41 and the chamber cover 33 are connected.

  In the second step, the fixed scroll 41 to which the pipe assembly 30 is connected and the movable scroll 41 so that the spiral fixed side wrap 42 of the fixed scroll 41 and the spiral movable side wrap 45 of the movable scroll 44 are combined. The scroll 44 is engaged.

  The fixed scroll 41 is fixed to the housing 47 after being engaged with the movable scroll 44. More specifically, the outer edge portion 43 of the fixed scroll 41 is fixed to the housing 47 with bolts.

  In the third step, the upper cover 22 of the casing 20 is covered from above the pipe assembly 30. More specifically, the upper lid 22 is covered so that the suction pipe 31 and the injection pipe 32 are inserted into the hollow portions of the joint portions 24 and 25, respectively. After the upper lid 22 is put on the piping assembly 30, the upper lid 22 and the cylindrical member 21 are fixed by welding.

  In addition, when inserting piping into the joint parts 24 and 25, it is desirable to insert only the largest outer diameter piping with the largest outer diameter first. In the present embodiment, it is desirable that only the suction pipe 31 having the largest outer diameter is inserted into the joint portion 24 first.

  If it is attempted to attach the upper lid 22 by simultaneously inserting the suction pipe 31 into the joint portion 24 and the injection pipe 32 into the joint portion 25, it is not easy to carry out the operation while keeping the upper lid 22 horizontal, so it takes time to install. There is a case. However, by first inserting the largest outer diameter pipe into the joint, the largest outer diameter pipe can be used as a guide, and other pipes can be smoothly inserted into other joint parts without worrying about the inclination of the top cover 22. can do. In the present embodiment, the injection pipe 32 can be easily inserted into the joint portion 25 by inserting the suction pipe 31 thicker than the injection pipe 32 into the joint portion 24. It is possible to use a pipe having a small diameter as a guide, but the strength is weaker than that of a pipe having a large diameter. Therefore, it is necessary to carefully assemble so as not to bend the pipe by mistake. On the other hand, if the pipe having a large diameter is used as a guide, the assembling work can be easily performed.

  In the fourth step, swaging is performed so that the upper end side end portions (contact surfaces 24a and 25a) of the joint portions 24 and 25 are in contact with the suction pipe 31 and the injection pipe 32, respectively.

  In the fifth step, the joint portions 24 and 25 subjected to the swaging process, the suction pipe 31 and the injection pipe 32 are fixed by brazing.

(5) Features (5-1)
The scroll compressor 10 according to the present embodiment includes a casing 20, a pipe assembly 30, and a fixed scroll 41. The pipe assembly 30 includes a suction pipe 31 and an injection pipe 32 as pipes connecting the inside and outside of the casing 20, and a chamber cover 33. The suction pipe 31 and the injection pipe 32 are fixed to the chamber cover 33 so as to protrude from the upper surface 33a (front surface). The fixed scroll 41 is housed inside the casing 20, and a spiral fixed side wrap 42 projects from the lower surface 41 a (front surface) of the fixed scroll 41, and the upper surface 41 b (rear surface) of the fixed scroll 41 is connected to the lower surface 33 b of the chamber cover 33. The pipe assembly 30 is connected in an opposed state.

  Here, since the pipe assembly 30 in which a plurality of pipes (the suction pipe 31 and the injection pipe 32) and the chamber cover 33 are integrated is used, damage to the sealing material that may occur when installing the pipe using an O-ring. In addition, there is no occurrence of sealing failure due to the difference in material between the fixed scroll and the piping that may occur when piping is installed by press fitting, and the occurrence of sealing failure can be suppressed. Also, unlike pipe installation by press-fitting, no dust is generated during pipe installation. Therefore, the sliding part of a scroll compressor is not damaged by the dust at the time of piping attachment, and the reliability of a scroll compressor can be improved.

  That is, here, the highly reliable scroll compressor 10 in which the sealing performance of the pipes (the suction pipe 31 and the injection pipe 32) is improved can be realized.

(5-2)
The scroll compressor 10 according to the present embodiment further includes a gasket 35 as a sealing material. The gasket 35 is disposed between the pipe assembly 30 and the fixed scroll 41 so as to be in close contact with the pipe assembly 30 and the fixed scroll 41.

  Here, since the gasket 35 is provided between the fixed scroll 41 and the pipe assembly 30, the gap between the fixed scroll 41 and the chamber cover 33 is sufficiently sealed. In addition, unlike the O-ring, the gasket 35 is not directly attached to the suction pipe 31 and the injection pipe 32. Therefore, when the suction pipe 31 and the injection pipe 32 are fixed to the joint portions 24 and 25 by welding, The gasket 35 is unlikely to deteriorate due to heat. As a result, the scroll compressor 10 having excellent sealing performance can be realized.

(5-3)
In the scroll compressor 10 according to the present embodiment, the casing 20 has hollow joint portions 24 and 25 that are open at both ends. The suction pipe 31 is inserted into the joint portion 24 and fixed to the joint portion 24 by welding. The injection pipe 32 is inserted into the joint portion 25 and fixed to the joint portion 25 by welding. The joint portions 24 and 25 have contact surfaces 24a and 25a that are in contact with the suction pipe 31 and the injection pipe 32 on the inner surface of the end portion disposed outside the casing 20, and the suction pipe 31 and the injection other than the contact surfaces 24a and 25a. It does not contact the tube 32.

  Here, since the joint parts 24 and 25 do not contact the suction pipe 31 and the injection pipe 32, that is, the inner diameters of the joint parts 24 and 25 are larger than the outer diameters of the suction pipe 31 and the injection pipe 32, the joint part 24 is easily provided. , 25, the suction pipe 31 and the injection pipe 32 can be inserted, respectively, and the assemblability is good. The joint portions 24 and 25 have contact surfaces 24a and 25a that are in close contact with the suction pipe 31 and the injection pipe 32, respectively. However, the joint portions 24 and 25 are in contact with the suction pipe 31 and the injection pipe 32 only at the outer end portion of the casing 20. After the suction pipe 31 and the injection pipe 32 are inserted into 24 and 25, the joint portions 24 and 25 can be easily brought into close contact with the suction pipe 31 and the injection pipe 32 by swaging.

(5-4)
In the scroll compressor 10 according to the present embodiment, the welding of the suction pipe 31 and the injection pipe 32 and the joint portions 24 and 25 is brazing.

  Here, the suction pipe 31 and the injection pipe 32 and the joint portions 24 and 25 can be joined quickly and easily by brazing. As a result, the assemblability of the scroll compressor 10 can be improved.

(5-5)
The scroll compressor 10 according to the present embodiment further includes a movable scroll 44. A spiral movable side wrap 45 projects from the upper surface 44 a of the movable scroll 44. The fixed scroll 41 and the movable scroll 44 are engaged by combining the fixed side wrap 42 and the movable side wrap 45 so that the compression chamber Sc is formed by the fixed side wrap 42 and the movable side wrap 45. The fixed scroll 41 is formed with a first communication hole 41c and a second communication hole 41d for communicating the compression chamber Sc with the suction pipe 31 and the injection pipe 32 as the first pipe. The inner diameter of the first communication hole 41 c is larger than the inner diameter of the suction pipe 31. The inner diameter of the second communication hole 41d is larger than the inner diameter of the injection pipe 32.

  Here, since the inner diameters of the first and second communication holes 41c and 41d are larger than the inner diameters of the corresponding first pipes (the suction pipe 31 and the injection pipe 32), the first and second communication holes 41c and 41d can be adjusted even if the mounting position of the pipe assembly 30 is slightly shifted. The first and second communication holes 41c and 41d are sufficiently communicated with the suction pipe 31 and the injection pipe 32. Therefore, high accuracy is not required for the processing of the first and second communication holes 41c and 41d and the attachment of the pipe assembly 30, and processing and assembly are easy.

(5-6)
In the scroll compressor 10 according to this embodiment, a suction opening member 81 in which an opening 81a for communicating the compression chamber Sc and the suction pipe 31 as the first pipe is formed is press-fitted into the first communication hole 41c. ing. The inner diameter of the opening 81 a is larger than the inner diameter of the suction pipe 31.

  Here, since the inner diameter of the opening 81a formed in the suction opening member 81 is larger than the inner diameter of the corresponding suction pipe 31, the opening 81a and the suction pipe 31 are sufficiently communicated even if the mounting position of the pipe assembly 30 is slightly shifted. To do. Therefore, high accuracy is not required for attachment of the suction opening member 81 and the pipe assembly 30, and processing and assembly are easy.

(5-7)
The method for assembling the scroll compressor 10 according to this embodiment includes first to fifth steps. In the first step, the pipe assembly 30 and the gasket 35 are connected to the fixed scroll 41 from which the spiral fixed side wrap 42 protrudes from the lower surface 41a. The pipe assembly 30 includes a suction pipe 31 and an injection pipe 32, and a chamber cover 33 fixed to an upper surface 33a so that the suction pipe 31 and the injection pipe 32 protrude. From the lower surface 41 a of the fixed scroll 41, a spiral fixed side wrap 42 protrudes. The pipe assembly 30 and the gasket 35 are arranged such that the lower surface 33b of the chamber cover 33 and the upper surface 41b of the fixed scroll 41 face the fixed scroll 41, and the gasket 35 is disposed between the pipe assembly 30 and the fixed scroll 41. It is connected in the state. In the second step, the fixed scroll 41 to which the pipe assembly 30 and the gasket 35 are connected, and the movable scroll 44 from which the spiral movable side wrap 45 projects from the upper surface 44a are the fixed side wrap 42 and the movable side wrap 45. Are engaged to combine. In the third step, the upper lid 22 having hollow joint portions 24 and 25 having both ends opened is put on the pipe assembly 30 so that the suction pipe 31 and the injection pipe 32 are inserted into the joint portions 24 and 25. In the fourth step, the joint portions 24 and 25 are swaged with respect to the suction pipe 31 and the injection pipe 32. In the fifth step, the joint portions 24, 25, the suction pipe 31, and the injection pipe 32 are fixed by brazing.

  Here, it is possible to confirm the sealing performance when the pipe assembly 30 and the fixed scroll 41 are assembled with the gasket 35 interposed therebetween (at the end of the first step), and the suction pipe 31 and the injection pipe Occurrence of manufacturing defects related to the 32 sealability can be suppressed. Further, since the sliding portion of the scroll compressor is not damaged by dust generated when the pipe is attached unlike the case where the pipe is attached by press fitting, the reliability of the scroll compressor can be improved.

  In other words, in this assembly method, compared to the assembly method of the scroll compressor in which piping is attached using an O-ring and the assembly method of the scroll compressor in which piping is attached by press-fitting, the sealing performance of the piping and the reliability of the scroll compressor are improved. Can be improved.

  Further, since the suction pipe 31 and the injection pipe 32 and the joint portions 24 and 25 are brazed after the swaging, the suction pipe 31 and the injection pipe 32 can be assembled even when the positional accuracy of the suction pipe 31 and the injection pipe 32 is poor.

  When an O-ring is selected as the pipe sealing material, it is necessary to use a thick material, that is, a steel material for the pipe. Further, when fixing a steel pipe to a copper pipe or the like, it is necessary to take measures such as using brass brazing for brazing or copper plating on the steel. However, when the gasket 35 is used, a copper pipe can be used as the pipe (the suction pipe 31 and the injection pipe 32) as in the present embodiment. In addition, when the joint portions 24 and 25 are also made of copper as in the present embodiment, the suction pipe 31 and the injection pipe 32 and the joint portions 24 and 25 are brazed with a copper-based brazing material that is easy to handle. Is possible.

(5-8)
In the third step, the method of assembling the scroll compressor 10 according to the present embodiment is the largest outer diameter pipe having the largest outer diameter among the pipes in the third step. In this embodiment, the suction pipe 31 corresponds to the suction pipe 31. Then, the injection pipe 32 is inserted into the corresponding joint portion 25.

  Although it may be difficult to insert a plurality of pipes (the suction pipe 31 and the injection pipe 32) into the joint portions 24 and 25 at one time, the suction pipe 31 that is the largest outer diameter pipe is first connected to the joint portion 24. , The injection pipe 32 can be easily inserted into the joint portion 25 using the suction pipe 31 as a guide. As a result, the assemblability of the scroll compressor 10 can be improved.

  In addition, when the injection pipe 32 having a small diameter is used as a guide, there is a possibility that the upper cover 22 and the injection pipe 32 are brought into contact with each other and the injection pipe 32 may be deformed. By using it as a guide, the occurrence of such a problem can be prevented.

(6) Modification Examples of the present embodiment are shown below. A plurality of modified examples may be appropriately combined.

(6-1) Modification A
In the embodiment described above, the number of pipes is two, that is, the suction pipe 31 and the injection pipe 32, but the present invention is not limited to this, and three or more pipes may be provided in the chamber cover 33.

(6-2) Modification B
In the above embodiment, the suction pipe 31 and the injection pipe 32 are provided in the chamber cover 33, but the present invention is not limited to this, and the suction pipe 31 and the injection pipe 32 are provided on a plate member independent of the chamber cover 33. It may be attached.

  INDUSTRIAL APPLICABILITY The present invention is useful as a highly reliable scroll compressor that uses a pipe assembly and has improved pipe sealing performance.

10 Scroll compressor 20 Casing 22 Upper lid (casing upper lid)
24, 25 Joint portion 24a, 25a Contact surface 30 Piping assembly 31 Suction pipe (suction pipe, pipe, first pipe, maximum outer diameter pipe)
32 Injection pipe (pipe, first pipe)
33 Chamber cover (plate member)
33a Upper surface (front surface of plate member)
33b Lower surface (back surface of plate member)
35 Gasket (seal material)
41 Fixed scroll 41a Bottom surface (front of fixed scroll)
41b Upper surface (back of fixed scroll)
41c 1st communication hole (communication hole)
41d 2nd communication hole (communication hole)
42 Fixed Side Wrap 44 Movable Scroll 44a Upper Surface (Front of Movable Scroll)
45 Movable Wrap 81 Suction Opening Member (Opening Member)
81a Opening Sc Compression chamber

JP 2001-153072 A

Claims (8)

A casing (20);
A pipe assembly comprising a plurality of pipes (31, 32) including the suction pipe (31) connecting the inside and outside of the casing, and a plate member (33) fixed so that the pipe projects from the front face (33a). Solid (30);
The casing is housed in the casing, and a spiral fixed side wrap (42) projects from the front surface (41a), and the back surface (41b) is connected to the pipe assembly in a state of facing the back surface (33b) of the plate member. A fixed scroll (41);
A scroll compressor (10) comprising: A sealing material (35),
The sealing material is disposed between the pipe assembly and the fixed scroll so as to be in close contact with the pipe assembly and the fixed scroll.
The scroll compressor according to claim 1. The casing has a plurality of hollow joint portions (24, 25) whose both ends are open,
The pipe is inserted into the joint, and is fixed to the joint by welding,
The joint portion has a contact surface (24a, 25a) in contact with the pipe on the inner surface of the end portion arranged outside the casing, and does not contact the pipe except for the contact surface.
The scroll compressor according to claim 1 or 2. The welding is brazing,
The scroll compressor according to claim 3. A movable scroll (44) from which a spiral movable side wrap (45) protrudes from the front surface (44a);
Further comprising
The fixed scroll and the movable scroll are engaged by combining the fixed side wrap and the movable side wrap so as to form a compression chamber (Sc) by the fixed side wrap and the movable side wrap,
The pipe includes a first pipe (31, 32),
In the fixed scroll, communication holes (41c, 41d) for communicating the compression chamber and the first pipe are formed,
An inner diameter of the communication hole is larger than an inner diameter of the first pipe.
The scroll compressor according to any one of claims 1 to 4. An opening member (81) having an opening (81a) for communicating the compression chamber and the first pipe (31) is press-fitted into at least one of the communication holes (41c),
The inner diameter of the opening is larger than the inner diameter of the first pipe.
The scroll compressor according to claim 5. A pipe assembly (30) having a plurality of pipes (31, 32) including a suction pipe (31), and a plate member (33) fixed so as to protrude from the front face (33a); and a sealing material (35) is opposed to the fixed scroll (41) from which the spiral fixed side wrap (42) protrudes from the front surface (41a), the back surface (33b) of the plate member and the back surface (41b) of the fixed scroll. And a first step of connecting the sealing material in a state of being disposed between the piping assembly and the fixed scroll,
The fixed scroll to which the piping assembly and the seal material are coupled, and the movable scroll (44) from which a spiral movable side wrap (45) projects from the front surface (44a), the fixed side wrap and the movable side. A second step of engaging the wrap in combination;
A third step of covering the pipe assembly with a casing upper lid (22) having a plurality of hollow joint parts (24, 25) open at both ends so as to insert the pipe into the joint part;
A fourth step of swaging the joint portion with respect to the pipe;
A fifth step of fixing the joint portion and the pipe by brazing;
A method of assembling the scroll compressor (10). In the third step, the largest outer diameter pipe (31) having the largest outer diameter among the pipes is inserted into the joint portion (24) corresponding to the largest outer diameter pipe, and then the largest outer diameter pipe. The pipes (32) other than those are inserted into the corresponding joint portions (25), respectively.
The method for assembling the scroll compressor according to claim 7.

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