JP2018141448A - Compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compressor having structure in which piping can be properly brazed using an optimum amount of a brazing filler metal.SOLUTION: A scroll compressor 101 comprises a casing 10, a piping joint 80 and external piping 82. The casing 10 has an upper face 12a in which an upper face opening 12b is formed. The piping joint 80 is fixed to the casing 10 at the upper face opening 12b. The external piping 82 is inserted into the piping joint 80, and fixed to the piping joint 80 by brazing. The piping joint 80 has a stopper part 80b. The stopper part 80b regulates a position at which the external piping 82 inserted into the piping joint 80 is fixed. A first distance D1 is 30% or less of a second distance D2. The first distance D1 is a distance between an upper face 12 at an external periphery of the upper face opening 12b and the stopper part 80b in an axial direction of the piping joint 80. The second distance D2 is a dimension of the external piping 82 in the axial direction inside the piping joint 80.SELECTED DRAWING: Figure 8

Description

  The present invention relates to a compressor used in a refrigeration apparatus or the like.

  A refrigerant pipe of a refrigerant circuit is attached to a compressor used for a refrigeration apparatus or the like. The refrigerant pipe is, for example, a metal pipe for supplying a low-pressure refrigerant to the compressor. As a method for attaching the refrigerant pipe to the compressor, as disclosed in Patent Document 1 (Japanese Patent Laid-Open No. 2003-206873), a tubular pipe joint is attached to the casing of the compressor, and an external pipe is provided inside the pipe joint. A method of inserting and fixing, and further fixing a refrigerant pipe to an external pipe is known. The inner peripheral surface of the pipe joint is brazed to the outer peripheral surface of the external pipe inside the pipe joint. The pipe joint is used for setting the fitting depth of the external pipe inside the pipe joint to a predetermined specified value or more when the external pipe is fixed to the pipe joint by brazing.

  However, in such an attachment method of the external pipe, there is a possibility that the following problems may occur depending on the position of the end of the external pipe inside the pipe joint.

  First, when the end of the external pipe is too far away from the outer surface of the casing toward the outside of the casing, when the joint between the pipe joint and the external pipe is heated with a burner or the like during brazing, The material may overheat and the liquid brazing material may leak into the casing. As a result, the amount of brazing material used may increase, or the brazing material that has drooped and hardened inside the casing may be peeled off and sucked into the compression chamber, damaging the compression mechanism.

  Second, if the end of the external pipe is too far away from the outer surface of the casing toward the inside of the casing, the joint between the pipe joint and the external pipe is heated with a burner during brazing. Part of the heat given to the part escapes to the casing, and the brazing material may not be heated sufficiently. In addition, since the joint near the end of the external pipe cannot be directly heated, the end of the external pipe may not be brazed appropriately.

  An object of the present invention is to provide a compressor having a structure capable of appropriately brazing piping using an optimal amount of brazing material.

  The compressor concerning the 1st viewpoint of the present invention is provided with a casing, a piping joint, and external piping. The casing has an outer surface in which an opening is formed. The pipe joint is a tubular member fixed to the casing at the opening. The external pipe is inserted into the pipe joint and fixed to the pipe joint by brazing. The pipe joint has a stopper portion. The stopper part regulates the position where the external pipe inserted into the pipe joint is fixed. The first distance is 30% or less of the second distance. The first distance is a distance between the outer surface on the outer periphery of the opening and the stopper portion in the axial direction of the pipe joint. The second distance is an axial dimension of the external pipe inside the pipe joint.

  In the compressor according to the first aspect, the stopper portion of the pipe joint is located in the vicinity of the outer surface of the casing in the axial direction of the pipe joint. For this reason, when brazing external piping to a pipe joint, there are problems that the brazing material leaks into the casing due to overheating of the brazing material, and that the heat at brazing escapes to the casing and brazing becomes insufficient. It is suppressed. Therefore, the compressor which concerns on a 1st viewpoint has a structure which can braze piping appropriately using the optimal quantity of brazing materials.

  A compressor according to a second aspect of the present invention is the compressor according to the first aspect, wherein the first distance is the first distance when the stopper portion is positioned outside the casing from the outer surface in the axial direction. 30% or less of 2 distances. The first distance is 10% or less of the second distance when the stopper portion is positioned inside the casing with respect to the outer surface in the axial direction.

  In the compressor according to the second aspect, the stopper portion of the pipe joint is located in the vicinity of the outer surface of the casing in the axial direction of the pipe joint. In particular, when the stopper portion of the pipe joint is located inside the casing rather than the outer surface of the casing, the distance between the stopper portion and the outer surface is strongly limited. Therefore, when the external pipe is brazed to the pipe joint, the compressor according to the second aspect can effectively suppress the problem that the heat at the time of brazing escapes to the casing and the brazing becomes insufficient. .

  The compressor which concerns on the 3rd viewpoint of this invention is a compressor which concerns on a 1st viewpoint or a 2nd viewpoint, Comprising: An outer surface is an upper surface of a casing. The first distance is the distance between the outer surface closest to the center of the outer surface and the stopper portion on the outer surface of the outer periphery of the opening.

  In the compressor according to the third aspect, when an opening for fixing the pipe joint is formed on the upper surface of the casing, a point closer to the center that is raised above the upper surface of the casing is used as the position of the outer surface. It is done. If the end of the upper surface of the casing, that is, the side below the center side is used as a reference, the stopper portion is in a state of deeply entering the casing on the center side. As a result, on the center side of the upper surface of the casing, a part of the heat given to the joint portion during brazing easily escapes to the casing. Therefore, when the external pipe is brazed to the pipe joint, the compressor according to the third aspect can effectively suppress the problem that the heat at the time of brazing escapes to the casing and the brazing becomes insufficient. .

  The compressor which concerns on the 4th viewpoint of this invention is a compressor which concerns on any one of the 1st thru | or 3rd viewpoint, Comprising: A piping joint has an inner side part and an outer side part. The inner portion is a portion inside the casing with respect to the stopper portion in the axial direction. The outer portion is a portion outside the casing with respect to the stopper portion. The thickness of the inner part is larger than the thickness of the outer part.

  In the compressor according to the fourth aspect, the pipe joint has a portion that is thicker than the other portions inside the casing from the stopper portion. The thick part of the pipe joint is a part where heat at the time of brazing is difficult to escape. Accordingly, when the external pipe is brazed to the pipe joint, the compressor according to the fourth aspect can effectively suppress the problem that the heat at the time of brazing escapes to the casing and the brazing becomes insufficient. .

  A compressor according to a fifth aspect of the present invention is the compressor according to any one of the first to fourth aspects, further comprising a compression mechanism and a suction pipe. The compression mechanism is housed in the casing and compresses the refrigerant. The suction pipe guides the refrigerant from the outside of the casing to the compression mechanism. The suction pipe is inserted into the external pipe and fixed to the external pipe by brazing.

  In the compressor according to the fifth aspect, the suction pipe for guiding the refrigerant to the compression mechanism is fixed to the external pipe. That is, in this compressor manufacturing process, after the external pipe is fixed to the pipe joint by brazing, the suction pipe is fixed to the external pipe by brazing. Therefore, it is not necessary to strictly set the position for fixing the suction pipe. Therefore, the compressor according to the fifth aspect can simplify the manufacturing process.

  The compressor concerning the 1st viewpoint of the present invention has the structure which can braze piping appropriately using the optimal amount of brazing material.

  The compressor which concerns on the 2nd viewpoint of this invention can suppress effectively the malfunction which a brazing material leaks inside a casing by overheating of a brazing material, when brazing external piping to a pipe joint.

  When the external pipe is brazed to the pipe joint, the compressor according to the third aspect of the present invention can effectively suppress the problem that the heat during brazing escapes to the casing and brazing becomes insufficient. it can.

  When the external pipe is brazed to the pipe joint, the compressor according to the fourth aspect of the present invention can effectively suppress the problem that the heat during brazing escapes to the casing and brazing becomes insufficient. it can.

  The compressor concerning the 5th viewpoint of the present invention can simplify a manufacturing process.

It is a longitudinal cross-sectional view of the scroll compressor 101 which concerns on 1st Embodiment. 4 is a bottom view of the fixed scroll 24. FIG. 3 is a top view of the movable scroll 26. FIG. It is a bottom view of the fixed scroll 24 in which the second wrap 26b of the movable scroll 26 and the compression chamber 40 are shown. FIG. 3 is a longitudinal sectional view of the upper part of the scroll compressor 101 showing a connection portion between the suction pipe 19 and the compression mechanism 15. FIG. 6 is an enlarged cross-sectional view of FIG. 5 in the vicinity of a pipe joint 80 and an external pipe 82. It is sectional drawing of the piping joint 80 shown by FIG. It is sectional drawing similar to FIG. 7, Comprising: It is the figure in which the 1st distance D1 and the 2nd distance D2 are shown. It is a figure showing the process of letting the suction | inhalation connecting pipe 84 attached to the fixed scroll 24 pass to the joint through-hole 80a of the piping joint 80 attached to the upper wall part 12. FIG. It is sectional drawing similar to FIG. 8 based on the modification A. FIG. 10 is a longitudinal sectional view of the vicinity of a pipe joint 180 when a discharge pipe 20 is fixed to a body casing portion 11 of the casing 10 via a pipe joint 180 in Modification E.

  A scroll compressor 101 according to an embodiment of the present invention will be described with reference to the drawings. The scroll compressor 101 is used in a refrigeration apparatus such as an air conditioner. The scroll compressor 101 compresses the refrigerant circulating in the refrigerant circuit of the refrigeration apparatus.

(1) Configuration of Scroll Compressor FIG. 1 is a longitudinal sectional view of the scroll compressor 101. In FIG. 1, an arrow U indicates a vertically upward direction. An arrow U indicating a vertically upward direction is also shown in FIGS. The scroll compressor 101 mainly includes a casing 10, a compression mechanism 15, a housing 23, an Oldham joint 39, a motor 16, a lower bearing 60, a crankshaft 17, a suction pipe 19, and a discharge pipe 20. Composed. Next, each component of the scroll compressor 101 will be described.

(1-1) Casing The casing 10 includes a cylindrical trunk casing portion 11, a bowl-shaped upper wall section 12, and a bowl-shaped bottom wall section 13. The upper wall portion 12 is welded to the upper end portion of the trunk portion casing portion 11 in an airtight manner. The bottom wall portion 13 is welded to the lower end portion of the body casing portion 11 in an airtight manner.

  The casing 10 is formed of a rigid member that is unlikely to be deformed or damaged when pressure and temperature change inside and outside the casing 10. The casing 10 is installed such that the cylindrical axial direction of the body casing portion 11 is along the vertical direction.

  The casing 10 mainly accommodates the compression mechanism 15, the housing 23, the Oldham coupling 39, the motor 16, the lower bearing 60, and the crankshaft 17. A suction pipe 19 and a discharge pipe 20 are welded to the casing 10 in an airtight manner.

  An oil reservoir space 10 a in which lubricating oil is stored is formed at the bottom of the internal space of the casing 10. The lubricating oil is a refrigerating machine oil that is used to keep the lubricity of the sliding portion of the compression mechanism 15 or the like during the operation of the scroll compressor 101.

  The casing 10 has an upper surface opening 12 b that is an opening formed in the upper surface 12 a of the upper wall portion 12. The upper surface 12 a is the outer surface of the casing 10. The upper surface opening 12b is used for connecting the suction pipe 19 and the compression mechanism 15 as will be described later.

(1-2) Compression Mechanism The compression mechanism 15 sucks and compresses low-temperature and low-pressure refrigerant gas, and discharges high-temperature and high-pressure refrigerant gas (hereinafter referred to as “compressed refrigerant”). The compression mechanism 15 is mainly composed of a fixed scroll 24 and a movable scroll 26. The fixed scroll 24 is fixed with respect to the casing 10. The movable scroll 26 performs a revolving motion with respect to the fixed scroll 24. FIG. 2 is a bottom view of the fixed scroll 24 viewed along the vertical direction. FIG. 3 is a top view of the movable scroll 26 viewed along the vertical direction.

(1-2-1) Fixed Scroll The fixed scroll 24 includes a first end plate 24a and a first wrap 24b. The first wrap 24b stands upright from the lower surface of the first end plate 24a. The first wrap 24b has a spiral shape when viewed along the vertical direction. As shown in FIG. 2, a C-shaped oil groove 24e is formed on the lower surface of the first end plate 24a.

  A main suction hole 24c is formed in the first end plate 24a. The main suction hole 24c is a space that connects the suction pipe 19 and a compression chamber 40 described later. The main suction hole 24 c is a space for introducing a low-temperature and low-pressure refrigerant gas from the suction pipe 19 into the compression chamber 40.

  As shown in FIG. 1, an enlarged recess 42, which is a cylindrical recess, is formed on the upper surface of the first end plate 24a. A discharge hole 41 is formed on the bottom surface of the enlarged recess 42. The discharge hole 41 communicates with the compression chamber 40.

  A first compressed refrigerant channel 46 is formed in the first end plate 24a. The first compressed refrigerant channel 46 opens to the enlarged recess 42 and the lower surface of the fixed scroll 24.

  A cover member 44 is fastened to the fixed scroll 24 by bolts 49. The bolt 49 penetrates the cover member 44 and is fixed to the first end plate 24a. The cover member 44 closes the enlarged recess 42 of the fixed scroll 24. The fixed scroll 24 and the cover member 44 are sealed via a gasket (not shown).

  By covering the enlarged recess 42 with the cover member 44, a muffler space 45 that silences the operation sound of the compression mechanism 15 is formed. The first compressed refrigerant channel 46 communicates with the muffler space 45.

(1-2-2) Movable Scroll The movable scroll 26 includes a second end plate 26a, a second wrap 26b, and an upper end bearing 26c. The second wrap 26b stands upright from the upper surface of the second end plate 26a. The second wrap 26b has a spiral shape when viewed along the vertical direction. The upper end bearing 26c stands upright from the center of the lower surface of the second end plate 26a. The upper end bearing 26c has a cylindrical shape.

  Oil supply pores 63 are formed in the second end plate 26a. The oil supply hole 63 communicates the space above the outer peripheral portion of the second end plate 26a and the space inside the upper end bearing 26c.

  The fixed scroll 24 and the movable scroll 26 are surrounded by the first end plate 24a, the first wrap 24b, the second end plate 26a, and the second wrap 26b when the first wrap 24b and the second wrap 26b are engaged with each other. A compression chamber 40 that is a space is formed. The volume of the compression chamber 40 is periodically changed by the revolving motion of the movable scroll 26. During the revolution of the movable scroll 26, the lower surfaces of the first end plate 24 a and the first wrap 24 b of the fixed scroll 24 slide with the upper surfaces of the second end plate 26 a and the second wrap 26 b of the movable scroll 26. Hereinafter, the surface of the first end plate 24a that slides with the movable scroll 26 is referred to as a thrust sliding surface 24d.

  FIG. 4 is a bottom view of the fixed scroll 24 in which the second wrap 26b of the movable scroll 26 and the compression chamber 40 are shown. In FIG. 4, the hatched area represents the thrust sliding surface 24d. As shown in FIG. 4, the oil groove 24e of the fixed scroll 24 is formed on the lower surface of the first end plate 24a so as to fit in the thrust sliding surface 24d.

(1-3) Housing The housing 23 is disposed below the compression mechanism 15 and above the motor 16. The outer peripheral surface of the housing 23 is joined to the inner peripheral surface of the body casing portion 11 in an airtight manner. Thereby, the internal space of the casing 10 is partitioned into a high-pressure space S <b> 1 below the housing 23 and an upper space S <b> 2 above the housing 23. The housing 23 mounts a fixed scroll 24 and sandwiches a movable scroll 26 together with the fixed scroll 24. A second compressed refrigerant channel 48 is formed on the outer periphery of the housing 23. The second compressed refrigerant channel 48 is a hole that penetrates the housing 23 in the vertical direction. The second compressed refrigerant channel 48 communicates with the first compressed refrigerant channel 46 on the upper surface of the housing 23, and communicates with the high-pressure space S <b> 1 on the lower surface of the housing 23.

  A recess called a crank chamber 23 a is formed on the upper surface of the housing 23. A housing through hole 31 is formed in the housing 23. The housing through hole 31 is a hole that penetrates the housing 23 in the vertical direction from the center of the bottom surface of the crank chamber 23 a to the center of the lower surface of the housing 23. Hereinafter, a part of the housing 23 and a part around the housing through hole 31 is referred to as an upper bearing 32.

  The housing 23 is formed with an oil discharge passage 23b that communicates the crank chamber 23a and the high-pressure space S1. In the crank chamber 23a, the opening of the oil discharge passage 23b is formed near the bottom surface of the crank chamber 23a.

(1-4) Oldham Joint The Oldham Joint 39 is a member for preventing the revolving movable scroll 26 from rotating. The Oldham coupling 39 is disposed between the movable scroll 26 and the housing 23.

(1-5) Motor The motor 16 is a brushless DC motor disposed below the housing 23. The motor 16 mainly has a stator 51 and a rotor 52.

  The stator 51 mainly includes a stator core 51a and a plurality of coils 51b. The stator core 51 a is a cylindrical member that is fixed to the inner peripheral surface of the casing 10. Stator core 51a has a plurality of teeth (not shown). A coil 51b is formed by winding a winding around the teeth.

  A plurality of core cuts are formed on the outer peripheral surface of the stator core 51a. The core cut is a groove formed in the vertical direction from the upper end surface to the lower end surface of the stator core 51a. The core cuts are formed at predetermined intervals along the circumferential direction of the stator core 51a. The core cut forms a core cut passage 55 that extends in the vertical direction between the body casing portion 11 and the stator core 51a.

  The rotor 52 is a columnar member disposed inside the stator core 51a. An air gap is formed between the inner peripheral surface of the stator core 51 a and the outer peripheral surface of the rotor 52. The rotor 52 is connected to the crankshaft 17. The rotor 52 is connected to the compression mechanism 15 via the crankshaft 17. The rotor 52 rotates the crankshaft 17 around the rotation shaft 16a. The rotation shaft 16 a passes through the central axis of the rotor 52.

(1-6) Lower Bearing The lower bearing 60 is disposed below the motor 16. The outer peripheral surface of the lower bearing 60 is joined to the inner peripheral surface of the casing 10. The lower bearing 60 rotatably supports the crankshaft 17. An oil separation plate 62 is attached to the lower bearing 60. The oil separation plate 62 is a plate-like member that is accommodated inside the casing 10. The oil separation plate 62 is fixed to the upper end surface of the lower bearing 60.

(1-7) Crankshaft The crankshaft 17 is disposed such that its axial direction is along the vertical direction. The shaft center of the upper end portion of the crankshaft 17 is eccentric with respect to the shaft center of the portion excluding the upper end portion. The crankshaft 17 has a balance weight 18. The balance weight 18 is fixed in close contact with the crankshaft 17 at a height position below the housing 23 and above the motor 16.

  The crankshaft 17 passes through the center of rotation of the rotor 52 in the vertical direction and is connected to the rotor 52. The upper end portion of the crankshaft 17 is fitted into the upper end bearing 26 c of the movable scroll 26. Thereby, the crankshaft 17 is connected to the movable scroll 26. The crankshaft 17 is rotatably supported by the upper bearing 32 and the lower bearing 60.

  A main oil supply passage 61 is formed inside the crankshaft 17. The main oil supply passage 61 extends along the axial direction of the crankshaft 17. The upper end of the main oil supply passage 61 communicates with an oil chamber 83 that is a space between the upper end surface of the crankshaft 17 and the lower surface of the second end plate 26a. The oil chamber 83 communicates with the thrust sliding surface 24d and the oil groove 24e via the oil supply hole 63 of the second end plate 26a, and communicates with the compression chamber 40. The lower end of the main oil supply passage 61 communicates with the oil sump space 10a.

  The crankshaft 17 has a first sub oil supply path 61 a, a second sub oil supply path 61 b, and a third sub oil supply path 61 c that branch from the main oil supply path 61. The first sub oil supply path 61a, the second sub oil supply path 61b, and the third sub oil supply path 61c extend in the horizontal direction. The first sub oil supply passage 61 a opens at a sliding portion between the crankshaft 17 and the upper end bearing 26 c of the movable scroll 26. The second sub oil supply passage 61 b opens at a sliding portion between the crankshaft 17 and the upper bearing 32 of the housing 23. The third sub oil supply passage 61 c opens at a sliding portion between the crankshaft 17 and the lower bearing 60.

(1-8) Suction Pipe The suction pipe 19 is a pipe for introducing the refrigerant of the refrigerant circuit from the outside of the casing 10 to the compression mechanism 15. As will be described later, the suction pipe 19 is connected to a suction connection pipe 84 outside the casing 10. The suction connection pipe 84 passes through the upper wall portion 12 of the casing 10. Inside the casing 10, the end of the suction connection pipe 84 is fitted in the main suction hole 24 c of the fixed scroll 24.

(1-9) Discharge Pipe The discharge pipe 20 is a pipe for discharging the compressed refrigerant from the high-pressure space S1 to the outside of the casing 10. The discharge pipe 20 penetrates the trunk casing portion 11 of the casing 10. The discharge pipe 20 penetrates the high-pressure space S1 in the horizontal direction. Inside the casing 10, the end of the discharge pipe 20 is at a height position between the housing 23 and the motor 16.

(2) Detailed Configuration of Suction Pipe Next, a detailed configuration of a connection portion between the suction pipe 19 and the compression mechanism 15 will be described. FIG. 5 is a vertical cross-sectional view of the upper portion of the scroll compressor 101 showing the connection between the suction pipe 19 and the compression mechanism 15. As shown in FIG. 5, a suction check valve 24 f is provided in the main suction hole 24 c of the compression mechanism 15. The suction check valve 24 f prevents the flow of refrigerant from the main suction hole 24 c of the compression mechanism 15 toward the suction pipe 19.

  As shown in FIG. 5, the suction pipe 19 is fixed to the casing 10 via a pipe joint 80, an external pipe 82 and a suction connection pipe 84. FIG. 6 is an enlarged cross-sectional view of FIG. 5 in the vicinity of the pipe joint 80 and the external pipe 82. The pipe joint 80 and the external pipe 82 are members for fixing the suction connection pipe 84 to the casing 10 and connecting it to the compression mechanism 15. The suction connection pipe 84 is a member to which the suction pipe 19 is connected. The refrigerant flowing through the suction pipe 19 passes through the suction connection pipe 84 and is introduced into the main suction hole 24 c of the compression mechanism 15.

(2-1) Piping Joint FIG. 7 is a cross-sectional view of the piping joint 80 shown in FIG. The pipe joint 80 is a tubular member having a joint through hole 80a that is a hole penetrating along the axial direction. Here, the axial direction is the longitudinal direction of the pipe joint 80 and is a direction parallel to the vertical direction indicated by the arrow U in FIG. The material of the pipe joint 80 is a metal such as iron. The pipe joint 80 is fixed to the casing 10 by welding in a state where a part thereof is inserted into the upper surface opening 12 b of the casing 10.

  The joint through hole 80a of the pipe joint 80 has an inner diameter that allows the external pipe 82 to be inserted in the axial direction from the opening on the upper side in the vertical direction. Moreover, the joint through-hole 80a has a stepped portion 80b in which the inner diameter becomes smaller in the middle from the upper side to the lower side in the vertical direction. The step portion 80 b is a horizontal plane orthogonal to the axial direction of the pipe joint 80.

  Below the stepped portion 80b, the joint through hole 80a has an inner diameter such that the external pipe 82 cannot be inserted in the axial direction. That is, the inner diameter of the joint through hole 80a is smaller than the outer diameter of the external pipe 82 below the stepped portion 80b in the vertical direction. In addition, above the stepped portion 80 b in the vertical direction, the inner diameter of the joint through hole 80 a is larger than the outer diameter of the external pipe 82.

  Therefore, when the lower end of the external pipe 82 comes into contact with the stepped part 80b in the process of inserting the external pipe 82 into the joint through hole 80a from the opening on the upper side in the vertical direction of the pipe joint 80, the external pipe 82 is further connected to the joint. It cannot be inserted into the through hole 80a. As described above, the stepped portion 80b of the pipe joint 80 functions as a stopper portion that regulates the position where the external pipe 82 inserted into the joint through hole 80a is fixed.

  Hereinafter, as necessary, as shown in FIG. 7, a tubular portion that is a part of the pipe joint 80 and is vertically lower than the stepped portion 80 b is referred to as an inner portion 80 c, and is more vertical than the stepped portion 80 b. The upper tubular portion is referred to as an outer portion 80d. The inner portion 80 c corresponds to a portion inside the casing 10 with respect to the stepped portion 80 b in the axial direction of the pipe joint 80. The outer portion 80d corresponds to a portion outside the casing 10 with respect to the stepped portion 80b in the axial direction of the pipe joint 80. As shown in FIG. 7, the inner portion 80c is a portion that is thicker than the outer portion 80d.

(2-2) External piping The external piping 82 is a tubular member whose inner diameter and outer diameter are constant in the axial direction. Here, the axial direction is the longitudinal direction of the external pipe 82 and is a direction parallel to the vertical direction indicated by the arrow U in FIG. The material of the external pipe 82 is a metal such as copper. The external pipe 82 is fixed to the pipe joint 80 by brazing welding in a state where a part thereof is inserted into the joint through hole 80a of the pipe joint 80.

  As shown in FIG. 6, the lower end of the external pipe 82 is in contact with the stepped portion 80 b of the pipe joint 80. This is because when the external pipe 82 is inserted into the joint through hole 80a of the pipe joint 80 from the upper side in the vertical direction, the lower end of the external pipe 82 comes into contact with the stepped portion 80b of the pipe joint 80, and the external pipe 82 is moved downward. It cannot be inserted any more. The external pipe 82 is fixed to the pipe joint 80 in a state where the lower end of the external pipe 82 is in contact with the stepped portion 80 b.

(2-3) Suction Connection Pipe The suction connection pipe 84 is a member that connects the compression mechanism 15 and the suction pipe 19. The suction connection pipe 84 is a pipe for introducing the refrigerant flowing through the suction pipe 19 into the compression mechanism 15. The material of the suction connection pipe 84 is a metal such as iron having excellent rigidity.

  From the upper side to the lower side in the vertical direction, the suction connection pipe 84 passes through the external pipe 82 and further passes through the joint through hole 80 a of the pipe joint 80. Therefore, the suction connection pipe 84 has a portion having an outer diameter smaller than the inner diameter of the external pipe 82 and the inner diameter of the inner portion 80 c of the pipe joint 80. The suction connection pipe 84 is fixed to the external pipe 82 by brazing welding. When the suction connection pipe 84 is an iron pipe and the external pipe 82 is a copper pipe, the outer surface of the suction connection pipe 84 may be plated with copper in order to facilitate brazing with the external pipe 82. preferable.

  The lower end in the vertical direction of the suction connection pipe 84 is inserted into the main suction hole 24 c of the fixed scroll 24 of the compression mechanism 15. An annular groove 84 a for fitting an O-ring (not shown) is formed at the lower end of the suction connection pipe 84. The O-ring is provided to maintain a sealing property between the inside of the suction connection pipe 84 and the main suction hole 24c. In the suction connection pipe 84, an O-ring is first fitted into the annular groove 84a, and then a lower end portion having the annular groove 84a is inserted into the main suction hole 24c.

  The suction connection pipe 84 has a thick portion 84b above the annular groove 84a and below the pipe joint 80. The thick portion 84b is a portion that is thicker than the other portions. The outer diameter of the thick portion 84 b is larger than the inner diameter of the main suction hole 24 c and the inner diameter of the inner portion 80 c of the pipe joint 80. Therefore, the thick portion 84b restricts the position of the suction connection pipe 84 when inserted into the main suction hole 24c, and prevents the suction connection pipe 84 from coming out of the pipe joint 80 upward. Function as.

  The end of the suction pipe 19 is inserted into the upper end of the suction connection pipe 84 in the vertical direction. The suction connection pipe 84 has a connection pipe stepped portion 84c having an inner diameter that decreases from the upper side to the lower side at the upper end. As shown in FIG. 6, the connecting pipe step part 84 c functions as a stopper part that regulates the position of the lower end part of the suction pipe 19 inserted into the suction connection pipe 84.

(2-4) Positional relationship between piping joint and casing Next, the positional relationship between the piping joint 80 and the casing 10, particularly the position in the axial direction (vertical direction) of the piping joint 80 will be described with reference to FIG. 8. . FIG. 8 is a cross-sectional view similar to FIG. 6, showing the first distance D1 and the second distance D2. The first distance D <b> 1 is a distance between the upper surface 12 a on the outer periphery of the upper surface opening 12 b of the casing 10 and the stepped portion 80 b of the pipe joint 80 in the axial direction (vertical direction) of the pipe joint 80. In FIG. 8, the stepped portion 80b is positioned above the upper surface 12a in the vertical direction. The second distance D2 is a dimension in the axial direction of the external pipe 82 in the joint through hole 80a of the pipe joint 80. That is, the second distance D <b> 2 is a vertical dimension of a portion of the external pipe 82 that is inserted into the pipe joint 80. In the present embodiment, the first distance D1 is limited to 30% or less of the second distance D2.

  The position of the upper surface 12a on the outer periphery of the upper surface opening 12b serving as a reference for the first distance D1 is the position of the upper surface 12a closest to the center of the upper surface 12a when the upper surface 12a is viewed along the vertical direction. In FIG. 8, the position of the upper surface 12a serving as a reference for the first distance D1 is shown as a reference point 12c. As shown in FIG. 5, when the upper surface 12a of the casing 10 has a convex shape upward in the vertical direction, the reference point 12c is a point that is located at the uppermost position in the vertical direction on the upper surface 12a on the outer periphery of the upper surface opening 12b. .

(2-5) Method for Fixing Suction Pipe Next, a method for fixing the suction pipe 19 to the casing 10 will be described. In the process described below, first, it is assumed that the upper wall portion 12 of the casing 10 is not attached to the body casing portion 11.

  In the first step, the suction connection pipe 84 is attached to the fixed scroll 24. Specifically, the suction connection pipe 84 in which an O-ring is fitted in the annular groove 84 a is fitted in the main suction hole 24 c of the fixed scroll 24. At this time, the suction connection pipe 84 is inserted toward the inside of the main suction hole 24c until the lower end of the thick portion 84b of the suction connection pipe 84 comes into contact with the upper surface of the fixed scroll 24 at the opening of the main suction hole 24c.

  In the next step, the pipe joint 80 is attached to the upper wall portion 12 of the casing 10. Specifically, first, the pipe joint 80 is fitted into the upper surface opening 12 b of the upper wall portion 12. Next, the pipe joint 80 is fixed to the upper wall portion 12 by welding.

  In the next step, the external pipe 82 is attached in the pipe joint 80. Specifically, first, the external pipe 82 is inserted into the pipe joint 80 from above in the vertical direction until the lower end of the external pipe 82 contacts the stepped portion 80 b of the pipe joint 80. Next, the external pipe 82 is fixed to the pipe joint 80 by brazing.

  The above three steps, that is, the step of attaching the suction connection pipe 84 to the fixed scroll 24, the step of attaching the pipe joint 80 to the upper wall portion 12, and the step of attaching the external pipe 82 to the pipe joint 80 are in any order. It may be done at.

  In the next step, the suction connection pipe 84 attached to the fixed scroll 24 is passed through the joint through hole 80a of the pipe joint 80 attached to the upper wall portion 12. FIG. 9 is a diagram for explaining this process. As shown by the arrows in FIG. 9, the upper wall portion 12 to which the pipe joint 80 is attached is lowered from above in the vertical direction so that the suction connection pipe 84 passes through the joint through hole 80 a of the pipe joint 80 from below in the vertical direction. Move towards. Thereafter, the upper wall portion 12 is attached to the trunk casing portion 11 by welding.

  In the next step, the suction pipe 19 is inserted into the suction connection pipe 84. At this time, the suction pipe 19 is inserted into the suction connection pipe 84 from above in the vertical direction until the lower end of the suction pipe 19 comes into contact with the connection pipe step portion 84 c of the suction connection pipe 84. The suction pipe 19 is fixed to the suction connection pipe 84 by brazing.

(3) Operation of Scroll Compressor First, the flow of refrigerant in the scroll compressor 101 will be described. Next, the flow of the lubricating oil inside the scroll compressor 101 will be described.

(3-1) Flow of refrigerant When the motor 16 is driven and the rotor 52 starts to rotate, the crankshaft 17 connected to the rotor 52 starts to rotate. The axial rotation movement of the crankshaft 17 is transmitted to the movable scroll 26 via the upper end bearing 26c. The axis of the upper end portion of the crankshaft 17 is eccentric with respect to the rotation axis of the crankshaft 17. Therefore, the movable scroll 26 performs a revolving motion with respect to the fixed scroll 24 by the rotational motion of the crankshaft 17. The movable scroll 26 is engaged with the housing 23 via an Oldham joint 39. Therefore, the rotation of the movable scroll 26 is prevented while the movable scroll 26 is revolving.

  The low-temperature and low-pressure refrigerant before being compressed is supplied from the suction pipe 19 to the compression chamber 40 of the compression mechanism 15 via the main suction hole 24c. By the revolving motion of the movable scroll 26, the compression chamber 40 moves from the outer peripheral portion of the fixed scroll 24 toward the center portion while gradually reducing the volume. As a result, the refrigerant in the compression chamber 40 is compressed to become a compressed refrigerant. The compressed refrigerant is discharged from the discharge hole 41 to the muffler space 45 and then discharged to the high-pressure space S <b> 1 above the motor 16 via the first compressed refrigerant channel 46 and the second compressed refrigerant channel 48. Thereafter, the compressed refrigerant flows downward in a part of the core cut passage 55 and reaches the high-pressure space S <b> 1 below the motor 16. Thereafter, the compressed refrigerant reverses the flow direction, flows upward through the other core cut passages 55 and the air gap of the motor 16, and reaches the high-pressure space S <b> 1 above the motor 16. Thereafter, the compressed refrigerant is discharged from the discharge pipe 20 to the outside of the scroll compressor 101.

(3-2) Flow of lubricating oil When the motor 16 is driven and the rotor 52 starts to rotate, the crankshaft 17 connected to the rotor 52 starts to rotate. When the compression mechanism 15 compresses the refrigerant by the rotational movement of the crankshaft 17 and the compressed refrigerant is supplied to the high-pressure space S1, the pressure in the high-pressure space S1 increases. The lower end of the main oil supply passage 61 of the crankshaft 17 communicates with the oil sump space 10a at the bottom of the high pressure space S1. The upper end of the main oil supply passage 61 communicates with the low pressure space S <b> 2 through the oil chamber 83 and the oil supply pores 63. Thereby, a differential pressure is generated between the upper end and the lower end of the main oil supply passage 61. As a result, the lubricating oil stored in the oil reservoir space 10 a is sucked from the lower end of the main oil supply passage 61 due to the differential pressure, and rises in the main oil supply passage 61 toward the oil chamber 83.

  Most of the lubricating oil that moves up the main oil supply passage 61 is sequentially divided into the third sub oil supply passage 61c, the second sub oil supply passage 61b, and the first sub oil supply passage 61a. The lubricating oil flowing through the third sub oil supply passage 61c lubricates the sliding portion between the crankshaft 17 and the lower bearing 60, and then flows into the high pressure space S1 and returns to the oil pool space 10a. The lubricating oil flowing through the second auxiliary oil supply passage 61b lubricates the sliding portion between the crankshaft 17 and the upper bearing 32 of the housing 23, and then flows into the high-pressure space S1 and the crank chamber 23a. The lubricating oil that has flowed into the high-pressure space S1 returns to the oil reservoir space 10a. The lubricating oil that has flowed into the crank chamber 23a flows into the high-pressure space S1 via the oil discharge passage 23b and returns to the oil pool space 10a. The lubricating oil flowing through the first auxiliary oil supply passage 61a lubricates the sliding portion between the crankshaft 17 and the upper end bearing 26c of the movable scroll 26, and then flows into the crank chamber 23a and passes through the oil discharge passage 23b. Flows into the high-pressure space S1 and returns to the oil sump space 10a.

  The lubricating oil that has moved up to the upper end of the main oil supply passage 61 and reached the oil chamber 83 flows through the oil supply holes 63 and is supplied to the oil groove 24e due to the differential pressure. Part of the lubricating oil supplied to the oil groove 24e leaks into the low pressure space S2 and the compression chamber 40 while sealing the thrust sliding surface 24d. At this time, the leaked high-temperature lubricating oil heats the low-temperature refrigerant gas existing in the low-pressure space S2 and the compression chamber 40. The lubricating oil in the low pressure space S2 flows into the compression chamber 40 together with the refrigerant. The lubricating oil that has flowed into the compression chamber 40 is mixed with the compressed refrigerant in the form of minute oil droplets. The lubricating oil mixed in the compressed refrigerant flows from the compression chamber 40 into the high-pressure space S1 through the same path as the compressed refrigerant. Thereafter, the lubricant oil collides with the oil separation plate 62 after descending the core cut passage 55 together with the compressed refrigerant. The lubricating oil adhering to the oil separation plate 62 falls in the high pressure space S1 and returns to the oil reservoir space 10a.

(4) Features of scroll compressor (4-1)
In the scroll compressor 101 of this embodiment, the suction pipe 19 is fixed to the casing 10 via a pipe joint 80, an external pipe 82, and a suction connection pipe 84. In FIG. 8, the first distance D1 is limited to 30% or less of the second distance D2. Since the second distance D2 is a value that is fixed according to the specifications of the pipe joint 80, the scroll compressor 101 has an allowable range of the first distance D1 set on the basis of the second distance D2. Become. That is, the pipe joint 80 is fixed to the casing 10 so that the stepped portion 80 b of the pipe joint 80 is positioned in the vicinity of the upper surface 12 a of the casing 10 in the axial direction (vertical direction) of the pipe joint 80. Thereby, generation | occurrence | production of the malfunction at the time of brazing the external piping 82 to the piping joint 80 is suppressed.

  Here, two types of problems that may occur when the stepped portion 80b of the pipe joint 80 is not located near the upper surface 12a of the casing 10 in the axial direction of the pipe joint 80 will be described.

  First, in the vertical direction, when the end of the external pipe 82 is too far away from the upper surface 12a of the casing 10 toward the outside of the casing 10 (upper side in the vertical direction), the pipe joint 80 and the external pipe 82 are brazed. When the joining portion is heated by a burner or the like, heat is unlikely to escape from the joining portion, the brazing material may be overheated and the liquid brazing material may leak into the casing 10. As a result, the amount of brazing material used may increase, or the brazing material drooped and hardened inside the casing 10 may be peeled off and sucked into the compression chamber 40 to damage the compression mechanism 15.

  Secondly, when the end of the external pipe 82 is too far away from the upper surface 12a of the casing 10 toward the inside of the casing 10 (downward in the vertical direction), the pipe joint 80 and the external pipe 82 are joined at the time of brazing. When the part is heated with a burner or the like, part of the heat applied to the joint part escapes to the casing 10 and the brazing material may not be heated sufficiently. Further, since the joint near the end of the external pipe 82 cannot be directly heated, the end of the external pipe 82 may not be brazed appropriately.

  In the present embodiment, in order to suppress the above problems, the pipe joint 80 is connected to the casing so that the stepped portion 80b of the pipe joint 80 is positioned in the vicinity of the upper surface 12a of the casing 10 in the axial direction of the pipe joint 80. 10 is fixed. As a result, when the external pipe 82 is brazed to the pipe joint 80, the brazing material leaks into the casing 10 due to overheating of the brazing material, and the brazing heat escapes to the casing 10 and brazing is not possible. Occurrence of sufficient defects is suppressed.

  Therefore, the scroll compressor 101 has a structure capable of appropriately brazing the pipe using an optimal amount of brazing material.

(4-2)
In the scroll compressor 101 of the present embodiment, the first distance D1 is a distance between the reference point 12c shown in FIG. 8 and the stepped portion 80b of the pipe joint 80 in the vertical direction. The reference point 12c is a point closest to the center of the upper surface 12a viewed along the vertical direction on the upper surface 12a on the outer periphery of the upper surface opening 12b of the casing 10.

As shown in FIG. 5, the upper surface 12 b of the casing 10 has a shape in which the center portion is located upward in the vertical direction compared to the end portion and is convex upward. Therefore, as shown in FIG. 5, when the upper surface opening 12b is formed at a position away from the center of the upper surface 12b, the reference point 12c for measuring the first distance D1 is on the outer periphery of the upper surface opening 12b. It is preferable to use a point near the center (reference point 12c in FIG. 8) that is located at the uppermost position in the vertical direction. Temporarily, the point 12d shown in FIG. 8, that is, the outer periphery of the upper surface opening 12b When a point 12d that is the upper point and is located at the lowest position in the vertical direction is used as a reference point for measuring the first distance D1, the stepped portion 80b of the pipe joint 80 is located inside the casing 10 at the reference point 12c. It will be in a state where it has entered deeply. As a result, when the external pipe 82 is brazed to the pipe joint 80, part of the heat applied to the joint portion easily escapes to the casing 10. Therefore, as the reference point 12c for measuring the first distance D1, it is preferable to use a point closest to the center of the upper surface 12a on the upper surface 12a on the outer periphery of the upper surface opening 12b of the casing 10. Thereby, when brazing the external piping 82 to the piping joint 80, the scroll compressor 101 effectively suppresses the problem that heat during brazing escapes to the casing 10 and brazing becomes insufficient. it can.

(4-3)
In the scroll compressor 101 of the present embodiment, the pipe joint 80 has an inner part 80c and an outer part 80d. In the pipe joint 80, the inner side portion 80c is a portion that is thicker than the other portion inside the casing 10 (lower in the vertical direction) than the stepped portion 80b. The inner portion 80c, which is a thick portion of the pipe joint 80, is a portion where heat at the time of brazing is difficult to escape when the pipe joint 80 and the external pipe 82 are brazed. Therefore, the scroll compressor 101 uses the pipe joint 80 having the inner portion 80c, so that when the external pipe 82 is brazed to the pipe joint 80, heat at the time of brazing escapes to the casing 10 and brazing is not possible. Insufficient defects can be effectively suppressed.

(5) Modifications Modifications applicable to the embodiment of the present invention will be described.

(5-1) Modification A
In the embodiment, as shown in FIG. 8, the stepped portion 80 b of the pipe joint 80 is positioned above the upper surface 12 a of the casing 10 in the vertical direction. However, the stepped portion 80b may be positioned below the upper surface 12a in the vertical direction. FIG. 10 is a cross-sectional view similar to FIG. 8 when the stepped portion 80b is positioned below the top surface 12a in the vertical direction.

  In FIG. 10, the stepped portion 80 b of the pipe joint 80 is located inside the casing 10 (lower in the vertical direction) than the upper surface 12 a of the casing 10. Also in FIG. 10, the first distance D1 is defined as the distance between the stepped portion 80b and the upper surface 12a in the vertical direction. Similar to the embodiment, also in FIG. 10, the first distance D1 is limited to 30% or less of the second distance D2.

  Also in this modification, the occurrence of problems when brazing the external pipe 82 to the pipe joint 80 is suppressed by limiting the axial position of the pipe joint 80 in the same manner as in the embodiment.

(5-2) Modification B
In the embodiment and Modification A, the first distance D1 is limited to 30% or less of the second distance D2. From the viewpoint of suppressing the occurrence of problems when brazing the external pipe 82 to the pipe joint 80, the first distance D1 is preferably as short as possible and more preferably zero. When the first distance D1 is zero, the stepped portion 80b of the pipe joint 80 is at the same height as the upper surface 12a of the casing 10 in the vertical direction.

  In the present modification, the first distance D1 is limited to 10% or less of the second distance D2 as compared with the embodiment. That is, in the case where the stepped portion 80b of the pipe joint 80 is positioned above the upper surface 12a of the casing 10 in the vertical direction, the stepped portion 80b of the pipe joint 80 in the vertical direction is compared to the casing 10 in the vertical direction. It is located closer to the upper surface 12a.

  In this modification, compared with the embodiment, when the stepped portion 80b of the pipe joint 80 is located outside the casing 10 with respect to the upper surface 12a of the casing 10, the stepped portion 80b and the upper surface 12a in the vertical direction The distance between is more limited. Therefore, the scroll compressor 101 of the present modification is more effective than the embodiment in that the brazing material leaks into the casing due to overheating of the brazing material when the external pipe 82 is brazed to the pipe joint 80. Can be suppressed.

(5-3) Modification C
In the embodiment and Modification A, the first distance D1 is limited to 30% or less of the second distance D2. In Modification A, as shown in FIG. 10, the stepped portion 80 b of the pipe joint 80 is located on the inner side (lower in the vertical direction) of the casing 10 than the upper surface 12 a of the casing 10.

  In the present modification, in Modification A, the first distance D1 is limited to 10% or less of the second distance D2. That is, in the case where the stepped portion 80b of the pipe joint 80 is positioned below the upper surface 12a of the casing 10 in the vertical direction, the stepped portion 80b of the pipe joint 80 in the vertical direction is compared with the modification A in the casing. 10 is located closer to the upper surface 12a.

  In the present modification, as compared with Modification A, when the stepped portion 80b of the pipe joint 80 is located inside the casing 10 relative to the upper surface 12a of the casing 10, the stepped portion 80b and the upper surface 12a in the vertical direction. The distance between is more limited. Therefore, in the scroll compressor 101 of this modification, when brazing the external pipe 82 to the pipe joint 80, the heat at the time of brazing escapes to the casing 10 and the brazing is insufficient as compared with the modification A. Can be effectively suppressed.

(5-4) Modification D
In the embodiment and other modified examples, when the suction pipe 19 is fixed to the casing 10 of the scroll compressor 101 via the pipe joint 80, the position of the pipe joint 80 in the axial direction is limited, so that the external pipe Generation | occurrence | production of the malfunction at the time of brazing 82 to the piping joint 80 is suppressed. However, the embodiment and other modified examples may be applied to a process of fixing a suction pipe of a refrigerant circuit to a compressor other than the scroll compressor 101, for example, a casing of a rotary compressor.

  Also in this modified example, by restricting the position of the member corresponding to the pipe joint 80 in the same manner as in the embodiment, the occurrence of problems when the pipes are brazed and joined is suppressed.

(5-5) Modification E
In the embodiment and other modified examples, when the suction pipe 19 is fixed to the casing 10 of the scroll compressor 101 via the pipe joint 80, the position of the pipe joint 80 in the axial direction is limited, so that the external pipe Generation | occurrence | production of the malfunction at the time of brazing 82 to the piping joint 80 is suppressed. However, the embodiment and other modifications may be applied to the process of fixing the discharge pipe 20 to the casing 10 of the scroll compressor 101. In this case, the discharge pipe 20 is fixed to the casing 10 via a member corresponding to the pipe joint 80 of the embodiment.

  FIG. 11 is a longitudinal sectional view of the vicinity of the pipe joint 180 when the discharge pipe 20 is fixed to the body casing portion 11 of the casing 10 via the pipe joint 180 in the present modification. In FIG. 11, the surface of the trunk casing portion 11 outside the casing 10 is referred to as a trunk casing portion outer surface 11 a. The pipe joint 180 corresponds to the pipe joint 80 in the embodiment, and the discharge pipe 20 corresponds to the external pipe 82 in the embodiment.

  As shown in FIG. 11, the discharge pipe 20 is fixed to the trunk casing portion 11 via a pipe joint 180. The pipe joint 180 has a stepped portion 180b corresponding to the stepped portion 80b of the pipe joint 80 of the embodiment. The inner diameter of the pipe joint 180 decreases at the stepped portion 180b from the outer side to the inner side of the casing 10. The step portion 180 b is a plane orthogonal to the axial direction of the pipe joint 180. The pipe joint 180 is inserted into a hole formed in the trunk casing portion 11 and fixed to the trunk casing portion 11 by welding. The discharge pipe 20 is inserted into the pipe joint 180 from the outside of the casing 10. In the process of inserting the discharge pipe 20, when the end of the discharge pipe 20 comes into contact with the stepped portion 180b of the pipe joint 180, the discharge pipe 20 can be further inserted into the pipe joint 180 as shown in FIG. Disappear. In this state, the discharge pipe 20 is fixed to the pipe joint 180 by brazing. Thus, the stepped portion 180b of the pipe joint 180 functions as a stopper portion that regulates the position where the discharge pipe 20 is fixed.

  FIG. 11 shows the third distance D3 and the fourth distance D4. The third distance D3 is a distance between the trunk casing outer surface 11a and the stepped portion 180b of the pipe joint 180 in the axial direction of the pipe joint 180. In FIG. 11, the stepped portion 180b is located on the outer side of the casing 10 with respect to the outer surface 11a of the trunk portion casing portion. The fourth distance D4 is a dimension in the axial direction of the discharge pipe 20 inside the pipe joint 180. That is, the fourth distance D4 is a dimension of a part of the discharge pipe 20 that is inserted into the pipe joint 180. The third distance D3 corresponds to the first distance D1 in the embodiment, and the fourth distance D4 corresponds to the second distance D2 in the embodiment.

  In the present modification, as in the embodiment, the third distance D3 is limited to 30% or less of the fourth distance D4. Thereby, generation | occurrence | production of the malfunction at the time of brazing the discharge pipe 20 to the piping joint 180 is suppressed.

  In addition, in FIG. 11, the level | step-difference part 180b is located in the outer side of the casing 10 rather than the trunk | drum casing outer surface 11a. However, the stepped portion 180b may be located on the inner side of the casing 10 with respect to the outer surface 11a of the trunk portion casing portion. Similarly to the modified examples B and C, the third distance D3 may be limited to 10% or less of the fourth distance D4.

  Further, the embodiment and other modified examples may be applied to the process of fixing the injection pipe to the casing 10 of the scroll compressor 101. The injection pipe is a pipe fixed to the casing 10, and a part of the gas refrigerant separated by the gas-liquid separator connected to the refrigerant circuit is injected into the compression chamber 40 inside the compression mechanism 15 and compressed. It is a member for improving the refrigerating capacity of the scroll compressor 101 by lowering the internal temperature of the mechanism 15. In this case, the injection pipe is fixed to the casing 10 via members corresponding to the pipe joint 80, the external pipe 82, and the suction connection pipe 84.

  Also in this modified example, by restricting the position of the member corresponding to the pipe joint 80 in the same manner as in the embodiment, the occurrence of problems when the pipes are brazed and joined is suppressed.

(5-6) Modification F
In the scroll compressor 101 of the embodiment, the suction pipe 19 for guiding the refrigerant to the compression mechanism 15 is fixed to the external pipe 82 via the suction connection pipe 84. However, the suction pipe 19 may be directly fixed to the external pipe 82 by brazing. In this case, a member in which the suction pipe 19 of the embodiment and the suction connection pipe 84 are integrated is used as the suction pipe 19.

  The compressor according to the present invention has a structure capable of appropriately brazing a pipe using an optimal amount of brazing material.

10 Casing 12a Upper surface (outer surface)
12b Upper surface opening (opening)
15 Compression mechanism 19 Suction pipe 80 Piping joint 80b Step part (stopper part)
80c Inner part 80d Outer part 82 External piping 101 Scroll compressor (compressor)
D1 1st distance D2 2nd distance

JP 2003-206873 A

  The present invention relates to a compressor used in a refrigeration apparatus or the like.

  A refrigerant pipe of a refrigerant circuit is attached to a compressor used for a refrigeration apparatus or the like. The refrigerant pipe is, for example, a metal pipe for supplying a low-pressure refrigerant to the compressor. As a method for attaching the refrigerant pipe to the compressor, as disclosed in Patent Document 1 (Japanese Patent Laid-Open No. 2003-206873), a tubular pipe joint is attached to the casing of the compressor, and an external pipe is provided inside the pipe joint. A method of inserting and fixing, and further fixing a refrigerant pipe to an external pipe is known. The inner peripheral surface of the pipe joint is brazed to the outer peripheral surface of the external pipe inside the pipe joint. The pipe joint is used for setting the fitting depth of the external pipe inside the pipe joint to a predetermined specified value or more when the external pipe is fixed to the pipe joint by brazing.

  However, in such an attachment method of the external pipe, there is a possibility that the following problems may occur depending on the position of the end of the external pipe inside the pipe joint.

  First, when the end of the external pipe is too far away from the outer surface of the casing toward the outside of the casing, when the joint between the pipe joint and the external pipe is heated with a burner or the like during brazing, The material may overheat and the liquid brazing material may leak into the casing. As a result, the amount of brazing material used may increase, or the brazing material that has drooped and hardened inside the casing may be peeled off and sucked into the compression chamber, damaging the compression mechanism.

  Second, if the end of the external pipe is too far away from the outer surface of the casing toward the inside of the casing, the joint between the pipe joint and the external pipe is heated with a burner during brazing. Part of the heat given to the part escapes to the casing, and the brazing material may not be heated sufficiently. In addition, since the joint near the end of the external pipe cannot be directly heated, the end of the external pipe may not be brazed appropriately.

  An object of the present invention is to provide a compressor having a structure capable of appropriately brazing piping using an optimal amount of brazing material.

The compressor concerning the 1st viewpoint of the present invention is provided with a casing, a piping joint, and external piping. The casing has an outer surface in which an opening is formed. The pipe joint is a tubular member fixed to the casing at the opening. The external pipe is inserted into the pipe joint and fixed to the pipe joint by brazing. The pipe joint has a stopper portion. The stopper part regulates the position where the external pipe inserted into the pipe joint is fixed. In the axial direction of the pipe joint, the position of the stopper portion is the position of the outer surface on the outer periphery of the opening.

  In the compressor according to the first aspect, the stopper portion of the pipe joint is located in the vicinity of the outer surface of the casing in the axial direction of the pipe joint. For this reason, when brazing external piping to a pipe joint, there are problems that the brazing material leaks into the casing due to overheating of the brazing material, and that the heat at brazing escapes to the casing and brazing becomes insufficient. It is suppressed. Therefore, the compressor which concerns on a 1st viewpoint has a structure which can braze piping appropriately using the optimal quantity of brazing materials.

In the compressor according to the first aspect , the stopper portion of the pipe joint is located in the vicinity of the outer surface of the casing in the axial direction of the pipe joint. In particular, when the stopper portion of the pipe joint is located inside the casing rather than the outer surface of the casing, the distance between the stopper portion and the outer surface is strongly limited. Therefore, when the external pipe is brazed to the pipe joint, the compressor according to the first aspect can effectively suppress the problem that the heat at the time of brazing escapes to the casing and the brazing becomes insufficient. .

The compressor which concerns on the 2nd viewpoint of this invention is a compressor which concerns on a 1st viewpoint , Comprising: An outer surface is the upper surface of a casing. In the axial direction of the pipe joint, the position of the stopper portion is the outer surface on the outer periphery of the opening and is located on the outer surface closest to the center of the outer surface.

In the compressor according to the second aspect, when an opening for fixing the pipe joint is formed on the upper surface of the casing, a position closer to the center that is raised above the upper surface of the casing is used as the position of the outer surface. It is done. If the end of the upper surface of the casing, that is, the side below the center side is used as a reference, the stopper portion is in a state of deeply entering the casing on the center side. As a result, on the center side of the upper surface of the casing, part of the heat applied to the joint portion during brazing can easily escape to the casing. Therefore, when the external pipe is brazed to the pipe joint, the compressor according to the second aspect can effectively suppress the problem that the heat at the time of brazing escapes to the casing and the brazing becomes insufficient. .

The compressor which concerns on the 3rd viewpoint of this invention is a compressor which concerns on a 1st viewpoint or a 2nd viewpoint , Comprising: A piping joint has an inner side part and an outer side part. The inner portion is a portion inside the casing with respect to the stopper portion in the axial direction. The outer portion is a portion outside the casing with respect to the stopper portion. The thickness of the inner part is larger than the thickness of the outer part.

In the compressor according to the third aspect , the pipe joint has a portion that is thicker than the other portions inside the casing from the stopper portion. The thick part of the pipe joint is a part where heat at the time of brazing is difficult to escape. Therefore, when the external pipe is brazed to the pipe joint, the compressor according to the third aspect can effectively suppress the problem that the heat at the time of brazing escapes to the casing and the brazing becomes insufficient. .

A compressor according to a fourth aspect of the present invention is the compressor according to any one of the first to third aspects, and further includes a compression mechanism and a suction pipe. The compression mechanism is housed in the casing and compresses the refrigerant. The suction pipe guides the refrigerant from the outside of the casing to the compression mechanism. The suction pipe is inserted into the external pipe and fixed to the external pipe by brazing.

In the compressor according to the fourth aspect, the suction pipe for guiding the refrigerant to the compression mechanism is fixed to the external pipe. That is, in this compressor manufacturing process, after the external pipe is fixed to the pipe joint by brazing, the suction pipe is fixed to the external pipe by brazing. Therefore, it is not necessary to strictly set the position for fixing the suction pipe. Therefore, the compressor according to the fourth aspect can simplify the manufacturing process.

  The compressor concerning the 1st viewpoint of the present invention has the structure which can braze piping appropriately using the optimal amount of brazing material.

The compressor according to the first aspect of the present invention can effectively suppress a problem that the brazing material leaks into the casing due to overheating of the brazing material when the external pipe is brazed to the pipe joint.

When the external pipe is brazed to the pipe joint, the compressor according to the second aspect of the present invention can effectively suppress the problem that the heat during brazing escapes to the casing and brazing becomes insufficient. it can.

When the external pipe is brazed to the pipe joint, the compressor according to the third aspect of the present invention can effectively suppress the problem that the heat during brazing escapes to the casing and brazing becomes insufficient. it can.

The compressor concerning the 4th viewpoint of the present invention can simplify a manufacturing process.

It is a longitudinal cross-sectional view of the scroll compressor 101 which concerns on 1st Embodiment. 4 is a bottom view of the fixed scroll 24. FIG. 3 is a top view of the movable scroll 26. FIG. It is a bottom view of the fixed scroll 24 in which the second wrap 26b of the movable scroll 26 and the compression chamber 40 are shown. FIG. 3 is a longitudinal sectional view of the upper part of the scroll compressor 101 showing a connection portion between the suction pipe 19 and the compression mechanism 15. FIG. 6 is an enlarged cross-sectional view of FIG. 5 in the vicinity of a pipe joint 80 and an external pipe 82. It is sectional drawing of the piping joint 80 shown by FIG. It is sectional drawing similar to FIG. 7, Comprising: It is the figure in which the 1st distance D1 and the 2nd distance D2 are shown. It is a figure showing the process of letting the suction | inhalation connecting pipe 84 attached to the fixed scroll 24 pass to the joint through-hole 80a of the piping joint 80 attached to the upper wall part 12. FIG. It is sectional drawing similar to FIG. 8 based on the modification A. FIG. 10 is a longitudinal sectional view of the vicinity of a pipe joint 180 when a discharge pipe 20 is fixed to a body casing portion 11 of the casing 10 via a pipe joint 180 in Modification E.

  A scroll compressor 101 according to an embodiment of the present invention will be described with reference to the drawings. The scroll compressor 101 is used in a refrigeration apparatus such as an air conditioner. The scroll compressor 101 compresses the refrigerant circulating in the refrigerant circuit of the refrigeration apparatus.

(1) Configuration of Scroll Compressor FIG. 1 is a longitudinal sectional view of the scroll compressor 101. In FIG. 1, an arrow U indicates a vertically upward direction. An arrow U indicating a vertically upward direction is also shown in FIGS. The scroll compressor 101 mainly includes a casing 10, a compression mechanism 15, a housing 23, an Oldham joint 39, a motor 16, a lower bearing 60, a crankshaft 17, a suction pipe 19, and a discharge pipe 20. Composed. Next, each component of the scroll compressor 101 will be described.

(1-1) Casing The casing 10 includes a cylindrical trunk casing portion 11, a bowl-shaped upper wall section 12, and a bowl-shaped bottom wall section 13. The upper wall portion 12 is welded to the upper end portion of the trunk portion casing portion 11 in an airtight manner. The bottom wall portion 13 is welded to the lower end portion of the body casing portion 11 in an airtight manner.

  The casing 10 is formed of a rigid member that is unlikely to be deformed or damaged when pressure and temperature change inside and outside the casing 10. The casing 10 is installed such that the cylindrical axial direction of the body casing portion 11 is along the vertical direction.

  The casing 10 mainly accommodates the compression mechanism 15, the housing 23, the Oldham coupling 39, the motor 16, the lower bearing 60, and the crankshaft 17. A suction pipe 19 and a discharge pipe 20 are welded to the casing 10 in an airtight manner.

  An oil reservoir space 10 a in which lubricating oil is stored is formed at the bottom of the internal space of the casing 10. The lubricating oil is a refrigerating machine oil that is used to keep the lubricity of the sliding portion of the compression mechanism 15 or the like during the operation of the scroll compressor 101.

  The casing 10 has an upper surface opening 12 b that is an opening formed in the upper surface 12 a of the upper wall portion 12. The upper surface 12 a is the outer surface of the casing 10. The upper surface opening 12b is used for connecting the suction pipe 19 and the compression mechanism 15 as will be described later.

(1-2) Compression Mechanism The compression mechanism 15 sucks and compresses low-temperature and low-pressure refrigerant gas, and discharges high-temperature and high-pressure refrigerant gas (hereinafter referred to as “compressed refrigerant”). The compression mechanism 15 is mainly composed of a fixed scroll 24 and a movable scroll 26. The fixed scroll 24 is fixed with respect to the casing 10. The movable scroll 26 performs a revolving motion with respect to the fixed scroll 24. FIG. 2 is a bottom view of the fixed scroll 24 viewed along the vertical direction. FIG. 3 is a top view of the movable scroll 26 viewed along the vertical direction.

(1-2-1) Fixed Scroll The fixed scroll 24 includes a first end plate 24a and a first wrap 24b. The first wrap 24b stands upright from the lower surface of the first end plate 24a. The first wrap 24b has a spiral shape when viewed along the vertical direction. As shown in FIG. 2, a C-shaped oil groove 24e is formed on the lower surface of the first end plate 24a.

  A main suction hole 24c is formed in the first end plate 24a. The main suction hole 24c is a space that connects the suction pipe 19 and a compression chamber 40 described later. The main suction hole 24 c is a space for introducing a low-temperature and low-pressure refrigerant gas from the suction pipe 19 into the compression chamber 40.

  As shown in FIG. 1, an enlarged recess 42, which is a cylindrical recess, is formed on the upper surface of the first end plate 24a. A discharge hole 41 is formed on the bottom surface of the enlarged recess 42. The discharge hole 41 communicates with the compression chamber 40.

  A first compressed refrigerant channel 46 is formed in the first end plate 24a. The first compressed refrigerant channel 46 opens to the enlarged recess 42 and the lower surface of the fixed scroll 24.

  A cover member 44 is fastened to the fixed scroll 24 by bolts 49. The bolt 49 penetrates the cover member 44 and is fixed to the first end plate 24a. The cover member 44 closes the enlarged recess 42 of the fixed scroll 24. The fixed scroll 24 and the cover member 44 are sealed via a gasket (not shown).

  By covering the enlarged recess 42 with the cover member 44, a muffler space 45 that silences the operation sound of the compression mechanism 15 is formed. The first compressed refrigerant channel 46 communicates with the muffler space 45.

(1-2-2) Movable Scroll The movable scroll 26 includes a second end plate 26a, a second wrap 26b, and an upper end bearing 26c. The second wrap 26b stands upright from the upper surface of the second end plate 26a. The second wrap 26b has a spiral shape when viewed along the vertical direction. The upper end bearing 26c stands upright from the center of the lower surface of the second end plate 26a. The upper end bearing 26c has a cylindrical shape.

  Oil supply pores 63 are formed in the second end plate 26a. The oil supply hole 63 communicates the space above the outer peripheral portion of the second end plate 26a and the space inside the upper end bearing 26c.

  The fixed scroll 24 and the movable scroll 26 are surrounded by the first end plate 24a, the first wrap 24b, the second end plate 26a, and the second wrap 26b when the first wrap 24b and the second wrap 26b are engaged with each other. A compression chamber 40 that is a space is formed. The volume of the compression chamber 40 is periodically changed by the revolving motion of the movable scroll 26. During the revolution of the movable scroll 26, the lower surfaces of the first end plate 24 a and the first wrap 24 b of the fixed scroll 24 slide with the upper surfaces of the second end plate 26 a and the second wrap 26 b of the movable scroll 26. Hereinafter, the surface of the first end plate 24a that slides with the movable scroll 26 is referred to as a thrust sliding surface 24d.

  FIG. 4 is a bottom view of the fixed scroll 24 in which the second wrap 26b of the movable scroll 26 and the compression chamber 40 are shown. In FIG. 4, the hatched area represents the thrust sliding surface 24d. As shown in FIG. 4, the oil groove 24e of the fixed scroll 24 is formed on the lower surface of the first end plate 24a so as to fit in the thrust sliding surface 24d.

(1-3) Housing The housing 23 is disposed below the compression mechanism 15 and above the motor 16. The outer peripheral surface of the housing 23 is joined to the inner peripheral surface of the body casing portion 11 in an airtight manner. Thereby, the internal space of the casing 10 is partitioned into a high-pressure space S <b> 1 below the housing 23 and an upper space S <b> 2 above the housing 23. The housing 23 mounts a fixed scroll 24 and sandwiches a movable scroll 26 together with the fixed scroll 24. A second compressed refrigerant channel 48 is formed on the outer periphery of the housing 23. The second compressed refrigerant channel 48 is a hole that penetrates the housing 23 in the vertical direction. The second compressed refrigerant channel 48 communicates with the first compressed refrigerant channel 46 on the upper surface of the housing 23, and communicates with the high-pressure space S <b> 1 on the lower surface of the housing 23.

  A recess called a crank chamber 23 a is formed on the upper surface of the housing 23. A housing through hole 31 is formed in the housing 23. The housing through hole 31 is a hole that penetrates the housing 23 in the vertical direction from the center of the bottom surface of the crank chamber 23 a to the center of the lower surface of the housing 23. Hereinafter, a part of the housing 23 and a part around the housing through hole 31 is referred to as an upper bearing 32.

  The housing 23 is formed with an oil discharge passage 23b that communicates the crank chamber 23a and the high-pressure space S1. In the crank chamber 23a, the opening of the oil discharge passage 23b is formed near the bottom surface of the crank chamber 23a.

(1-4) Oldham Joint The Oldham Joint 39 is a member for preventing the revolving movable scroll 26 from rotating. The Oldham coupling 39 is disposed between the movable scroll 26 and the housing 23.

(1-5) Motor The motor 16 is a brushless DC motor disposed below the housing 23. The motor 16 mainly has a stator 51 and a rotor 52.

  The stator 51 mainly includes a stator core 51a and a plurality of coils 51b. The stator core 51 a is a cylindrical member that is fixed to the inner peripheral surface of the casing 10. Stator core 51a has a plurality of teeth (not shown). A coil 51b is formed by winding a winding around the teeth.

  A plurality of core cuts are formed on the outer peripheral surface of the stator core 51a. The core cut is a groove formed in the vertical direction from the upper end surface to the lower end surface of the stator core 51a. The core cuts are formed at predetermined intervals along the circumferential direction of the stator core 51a. The core cut forms a core cut passage 55 that extends in the vertical direction between the body casing portion 11 and the stator core 51a.

  The rotor 52 is a columnar member disposed inside the stator core 51a. An air gap is formed between the inner peripheral surface of the stator core 51 a and the outer peripheral surface of the rotor 52. The rotor 52 is connected to the crankshaft 17. The rotor 52 is connected to the compression mechanism 15 via the crankshaft 17. The rotor 52 rotates the crankshaft 17 around the rotation shaft 16a. The rotation shaft 16 a passes through the central axis of the rotor 52.

(1-6) Lower Bearing The lower bearing 60 is disposed below the motor 16. The outer peripheral surface of the lower bearing 60 is joined to the inner peripheral surface of the casing 10. The lower bearing 60 rotatably supports the crankshaft 17. An oil separation plate 62 is attached to the lower bearing 60. The oil separation plate 62 is a plate-like member that is accommodated inside the casing 10. The oil separation plate 62 is fixed to the upper end surface of the lower bearing 60.

(1-7) Crankshaft The crankshaft 17 is disposed such that its axial direction is along the vertical direction. The shaft center of the upper end portion of the crankshaft 17 is eccentric with respect to the shaft center of the portion excluding the upper end portion. The crankshaft 17 has a balance weight 18. The balance weight 18 is fixed in close contact with the crankshaft 17 at a height position below the housing 23 and above the motor 16.

  The crankshaft 17 passes through the center of rotation of the rotor 52 in the vertical direction and is connected to the rotor 52. The upper end portion of the crankshaft 17 is fitted into the upper end bearing 26 c of the movable scroll 26. Thereby, the crankshaft 17 is connected to the movable scroll 26. The crankshaft 17 is rotatably supported by the upper bearing 32 and the lower bearing 60.

  A main oil supply passage 61 is formed inside the crankshaft 17. The main oil supply passage 61 extends along the axial direction of the crankshaft 17. The upper end of the main oil supply passage 61 communicates with an oil chamber 83 that is a space between the upper end surface of the crankshaft 17 and the lower surface of the second end plate 26a. The oil chamber 83 communicates with the thrust sliding surface 24d and the oil groove 24e via the oil supply hole 63 of the second end plate 26a, and communicates with the compression chamber 40. The lower end of the main oil supply passage 61 communicates with the oil sump space 10a.

  The crankshaft 17 has a first sub oil supply path 61 a, a second sub oil supply path 61 b, and a third sub oil supply path 61 c that branch from the main oil supply path 61. The first sub oil supply path 61a, the second sub oil supply path 61b, and the third sub oil supply path 61c extend in the horizontal direction. The first sub oil supply passage 61 a opens at a sliding portion between the crankshaft 17 and the upper end bearing 26 c of the movable scroll 26. The second sub oil supply passage 61 b opens at a sliding portion between the crankshaft 17 and the upper bearing 32 of the housing 23. The third sub oil supply passage 61 c opens at a sliding portion between the crankshaft 17 and the lower bearing 60.

(1-8) Suction Pipe The suction pipe 19 is a pipe for introducing the refrigerant of the refrigerant circuit from the outside of the casing 10 to the compression mechanism 15. As will be described later, the suction pipe 19 is connected to a suction connection pipe 84 outside the casing 10. The suction connection pipe 84 passes through the upper wall portion 12 of the casing 10. Inside the casing 10, the end of the suction connection pipe 84 is fitted in the main suction hole 24 c of the fixed scroll 24.

(1-9) Discharge Pipe The discharge pipe 20 is a pipe for discharging the compressed refrigerant from the high-pressure space S1 to the outside of the casing 10. The discharge pipe 20 penetrates the trunk casing portion 11 of the casing 10. The discharge pipe 20 penetrates the high-pressure space S1 in the horizontal direction. Inside the casing 10, the end of the discharge pipe 20 is at a height position between the housing 23 and the motor 16.

(2) Detailed Configuration of Suction Pipe Next, a detailed configuration of a connection portion between the suction pipe 19 and the compression mechanism 15 will be described. FIG. 5 is a vertical cross-sectional view of the upper portion of the scroll compressor 101 showing the connection between the suction pipe 19 and the compression mechanism 15. As shown in FIG. 5, a suction check valve 24 f is provided in the main suction hole 24 c of the compression mechanism 15. The suction check valve 24 f prevents the flow of refrigerant from the main suction hole 24 c of the compression mechanism 15 toward the suction pipe 19.

  As shown in FIG. 5, the suction pipe 19 is fixed to the casing 10 via a pipe joint 80, an external pipe 82 and a suction connection pipe 84. FIG. 6 is an enlarged cross-sectional view of FIG. 5 in the vicinity of the pipe joint 80 and the external pipe 82. The pipe joint 80 and the external pipe 82 are members for fixing the suction connection pipe 84 to the casing 10 and connecting it to the compression mechanism 15. The suction connection pipe 84 is a member to which the suction pipe 19 is connected. The refrigerant flowing through the suction pipe 19 passes through the suction connection pipe 84 and is introduced into the main suction hole 24 c of the compression mechanism 15.

(2-1) Piping Joint FIG. 7 is a cross-sectional view of the piping joint 80 shown in FIG. The pipe joint 80 is a tubular member having a joint through hole 80a that is a hole penetrating along the axial direction. Here, the axial direction is the longitudinal direction of the pipe joint 80 and is a direction parallel to the vertical direction indicated by the arrow U in FIG. The material of the pipe joint 80 is a metal such as iron. The pipe joint 80 is fixed to the casing 10 by welding in a state where a part thereof is inserted into the upper surface opening 12 b of the casing 10.

  The joint through hole 80a of the pipe joint 80 has an inner diameter that allows the external pipe 82 to be inserted in the axial direction from the opening on the upper side in the vertical direction. Moreover, the joint through-hole 80a has a stepped portion 80b in which the inner diameter becomes smaller in the middle from the upper side to the lower side in the vertical direction. The step portion 80 b is a horizontal plane orthogonal to the axial direction of the pipe joint 80.

  Below the stepped portion 80b, the joint through hole 80a has an inner diameter such that the external pipe 82 cannot be inserted in the axial direction. That is, the inner diameter of the joint through hole 80a is smaller than the outer diameter of the external pipe 82 below the stepped portion 80b in the vertical direction. In addition, above the stepped portion 80 b in the vertical direction, the inner diameter of the joint through hole 80 a is larger than the outer diameter of the external pipe 82.

  Therefore, when the lower end of the external pipe 82 comes into contact with the stepped part 80b in the process of inserting the external pipe 82 into the joint through hole 80a from the opening on the upper side in the vertical direction of the pipe joint 80, the external pipe 82 is further connected to the joint. It cannot be inserted into the through hole 80a. As described above, the stepped portion 80b of the pipe joint 80 functions as a stopper portion that regulates the position where the external pipe 82 inserted into the joint through hole 80a is fixed.

  Hereinafter, as necessary, as shown in FIG. 7, a tubular portion that is a part of the pipe joint 80 and is vertically lower than the stepped portion 80 b is referred to as an inner portion 80 c, and is more vertical than the stepped portion 80 b. The upper tubular portion is referred to as an outer portion 80d. The inner portion 80 c corresponds to a portion inside the casing 10 with respect to the stepped portion 80 b in the axial direction of the pipe joint 80. The outer portion 80d corresponds to a portion outside the casing 10 with respect to the stepped portion 80b in the axial direction of the pipe joint 80. As shown in FIG. 7, the inner portion 80c is a portion that is thicker than the outer portion 80d.

(2-2) External piping The external piping 82 is a tubular member whose inner diameter and outer diameter are constant in the axial direction. Here, the axial direction is the longitudinal direction of the external pipe 82 and is a direction parallel to the vertical direction indicated by the arrow U in FIG. The material of the external pipe 82 is a metal such as copper. The external pipe 82 is fixed to the pipe joint 80 by brazing welding in a state where a part thereof is inserted into the joint through hole 80a of the pipe joint 80.

  As shown in FIG. 6, the lower end of the external pipe 82 is in contact with the stepped portion 80 b of the pipe joint 80. This is because when the external pipe 82 is inserted into the joint through hole 80a of the pipe joint 80 from the upper side in the vertical direction, the lower end of the external pipe 82 comes into contact with the stepped portion 80b of the pipe joint 80, and the external pipe 82 is moved downward. It cannot be inserted any more. The external pipe 82 is fixed to the pipe joint 80 in a state where the lower end of the external pipe 82 is in contact with the stepped portion 80 b.

(2-3) Suction Connection Pipe The suction connection pipe 84 is a member that connects the compression mechanism 15 and the suction pipe 19. The suction connection pipe 84 is a pipe for introducing the refrigerant flowing through the suction pipe 19 into the compression mechanism 15. The material of the suction connection pipe 84 is a metal such as iron having excellent rigidity.

  From the upper side to the lower side in the vertical direction, the suction connection pipe 84 passes through the external pipe 82 and further passes through the joint through hole 80 a of the pipe joint 80. Therefore, the suction connection pipe 84 has a portion having an outer diameter smaller than the inner diameter of the external pipe 82 and the inner diameter of the inner portion 80 c of the pipe joint 80. The suction connection pipe 84 is fixed to the external pipe 82 by brazing welding. When the suction connection pipe 84 is an iron pipe and the external pipe 82 is a copper pipe, the outer surface of the suction connection pipe 84 may be plated with copper in order to facilitate brazing with the external pipe 82. preferable.

  The lower end in the vertical direction of the suction connection pipe 84 is inserted into the main suction hole 24 c of the fixed scroll 24 of the compression mechanism 15. An annular groove 84 a for fitting an O-ring (not shown) is formed at the lower end of the suction connection pipe 84. The O-ring is provided to maintain a sealing property between the inside of the suction connection pipe 84 and the main suction hole 24c. In the suction connection pipe 84, an O-ring is first fitted into the annular groove 84a, and then a lower end portion having the annular groove 84a is inserted into the main suction hole 24c.

  The suction connection pipe 84 has a thick portion 84b above the annular groove 84a and below the pipe joint 80. The thick portion 84b is a portion that is thicker than the other portions. The outer diameter of the thick portion 84 b is larger than the inner diameter of the main suction hole 24 c and the inner diameter of the inner portion 80 c of the pipe joint 80. Therefore, the thick portion 84b restricts the position of the suction connection pipe 84 when inserted into the main suction hole 24c, and prevents the suction connection pipe 84 from coming out of the pipe joint 80 upward. Function as.

  The end of the suction pipe 19 is inserted into the upper end of the suction connection pipe 84 in the vertical direction. The suction connection pipe 84 has a connection pipe stepped portion 84c having an inner diameter that decreases from the upper side to the lower side at the upper end. As shown in FIG. 6, the connecting pipe step part 84 c functions as a stopper part that regulates the position of the lower end part of the suction pipe 19 inserted into the suction connection pipe 84.

(2-4) Positional relationship between piping joint and casing Next, the positional relationship between the piping joint 80 and the casing 10, particularly the position in the axial direction (vertical direction) of the piping joint 80 will be described with reference to FIG. 8. . FIG. 8 is a cross-sectional view similar to FIG. 6, showing the first distance D1 and the second distance D2. The first distance D <b> 1 is a distance between the upper surface 12 a on the outer periphery of the upper surface opening 12 b of the casing 10 and the stepped portion 80 b of the pipe joint 80 in the axial direction (vertical direction) of the pipe joint 80. In FIG. 8, the stepped portion 80b is positioned above the upper surface 12a in the vertical direction. The second distance D2 is a dimension in the axial direction of the external pipe 82 in the joint through hole 80a of the pipe joint 80. That is, the second distance D <b> 2 is a vertical dimension of a portion of the external pipe 82 that is inserted into the pipe joint 80. In the present embodiment, the first distance D1 is limited to 30% or less of the second distance D2.

  The position of the upper surface 12a on the outer periphery of the upper surface opening 12b serving as a reference for the first distance D1 is the position of the upper surface 12a closest to the center of the upper surface 12a when the upper surface 12a is viewed along the vertical direction. In FIG. 8, the position of the upper surface 12a serving as a reference for the first distance D1 is shown as a reference point 12c. As shown in FIG. 5, when the upper surface 12a of the casing 10 has a convex shape upward in the vertical direction, the reference point 12c is a point that is located at the uppermost position in the vertical direction on the upper surface 12a on the outer periphery of the upper surface opening 12b. .

(2-5) Method for Fixing Suction Pipe Next, a method for fixing the suction pipe 19 to the casing 10 will be described. In the process described below, first, it is assumed that the upper wall portion 12 of the casing 10 is not attached to the body casing portion 11.

  In the first step, the suction connection pipe 84 is attached to the fixed scroll 24. Specifically, the suction connection pipe 84 in which an O-ring is fitted in the annular groove 84 a is fitted in the main suction hole 24 c of the fixed scroll 24. At this time, the suction connection pipe 84 is inserted toward the inside of the main suction hole 24c until the lower end of the thick portion 84b of the suction connection pipe 84 comes into contact with the upper surface of the fixed scroll 24 at the opening of the main suction hole 24c.

  In the next step, the pipe joint 80 is attached to the upper wall portion 12 of the casing 10. Specifically, first, the pipe joint 80 is fitted into the upper surface opening 12 b of the upper wall portion 12. Next, the pipe joint 80 is fixed to the upper wall portion 12 by welding.

  In the next step, the external pipe 82 is attached in the pipe joint 80. Specifically, first, the external pipe 82 is inserted into the pipe joint 80 from above in the vertical direction until the lower end of the external pipe 82 contacts the stepped portion 80 b of the pipe joint 80. Next, the external pipe 82 is fixed to the pipe joint 80 by brazing.

  The above three steps, that is, the step of attaching the suction connection pipe 84 to the fixed scroll 24, the step of attaching the pipe joint 80 to the upper wall portion 12, and the step of attaching the external pipe 82 to the pipe joint 80 are in any order. It may be done at.

  In the next step, the suction connection pipe 84 attached to the fixed scroll 24 is passed through the joint through hole 80a of the pipe joint 80 attached to the upper wall portion 12. FIG. 9 is a diagram for explaining this process. As shown by the arrows in FIG. 9, the upper wall portion 12 to which the pipe joint 80 is attached is lowered from above in the vertical direction so that the suction connection pipe 84 passes through the joint through hole 80 a of the pipe joint 80 from below in the vertical direction. Move towards. Thereafter, the upper wall portion 12 is attached to the trunk casing portion 11 by welding.

  In the next step, the suction pipe 19 is inserted into the suction connection pipe 84. At this time, the suction pipe 19 is inserted into the suction connection pipe 84 from above in the vertical direction until the lower end of the suction pipe 19 comes into contact with the connection pipe step portion 84 c of the suction connection pipe 84. The suction pipe 19 is fixed to the suction connection pipe 84 by brazing.

(3) Operation of Scroll Compressor First, the flow of refrigerant in the scroll compressor 101 will be described. Next, the flow of the lubricating oil inside the scroll compressor 101 will be described.

(3-1) Flow of refrigerant When the motor 16 is driven and the rotor 52 starts to rotate, the crankshaft 17 connected to the rotor 52 starts to rotate. The axial rotation movement of the crankshaft 17 is transmitted to the movable scroll 26 via the upper end bearing 26c. The axis of the upper end portion of the crankshaft 17 is eccentric with respect to the rotation axis of the crankshaft 17. Therefore, the movable scroll 26 performs a revolving motion with respect to the fixed scroll 24 by the rotational motion of the crankshaft 17. The movable scroll 26 is engaged with the housing 23 via an Oldham joint 39. Therefore, the rotation of the movable scroll 26 is prevented while the movable scroll 26 is revolving.

  The low-temperature and low-pressure refrigerant before being compressed is supplied from the suction pipe 19 to the compression chamber 40 of the compression mechanism 15 via the main suction hole 24c. By the revolving motion of the movable scroll 26, the compression chamber 40 moves from the outer peripheral portion of the fixed scroll 24 toward the center portion while gradually reducing the volume. As a result, the refrigerant in the compression chamber 40 is compressed to become a compressed refrigerant. The compressed refrigerant is discharged from the discharge hole 41 to the muffler space 45 and then discharged to the high-pressure space S <b> 1 above the motor 16 via the first compressed refrigerant channel 46 and the second compressed refrigerant channel 48. Thereafter, the compressed refrigerant flows downward in a part of the core cut passage 55 and reaches the high-pressure space S <b> 1 below the motor 16. Thereafter, the compressed refrigerant reverses the flow direction, flows upward through the other core cut passages 55 and the air gap of the motor 16, and reaches the high-pressure space S <b> 1 above the motor 16. Thereafter, the compressed refrigerant is discharged from the discharge pipe 20 to the outside of the scroll compressor 101.

(3-2) Flow of lubricating oil When the motor 16 is driven and the rotor 52 starts to rotate, the crankshaft 17 connected to the rotor 52 starts to rotate. When the compression mechanism 15 compresses the refrigerant by the rotational movement of the crankshaft 17 and the compressed refrigerant is supplied to the high-pressure space S1, the pressure in the high-pressure space S1 increases. The lower end of the main oil supply passage 61 of the crankshaft 17 communicates with the oil sump space 10a at the bottom of the high pressure space S1. The upper end of the main oil supply passage 61 communicates with the low pressure space S <b> 2 through the oil chamber 83 and the oil supply pores 63. Thereby, a differential pressure is generated between the upper end and the lower end of the main oil supply passage 61. As a result, the lubricating oil stored in the oil reservoir space 10 a is sucked from the lower end of the main oil supply passage 61 due to the differential pressure, and rises in the main oil supply passage 61 toward the oil chamber 83.

  Most of the lubricating oil that moves up the main oil supply passage 61 is sequentially divided into the third sub oil supply passage 61c, the second sub oil supply passage 61b, and the first sub oil supply passage 61a. The lubricating oil flowing through the third sub oil supply passage 61c lubricates the sliding portion between the crankshaft 17 and the lower bearing 60, and then flows into the high pressure space S1 and returns to the oil pool space 10a. The lubricating oil flowing through the second auxiliary oil supply passage 61b lubricates the sliding portion between the crankshaft 17 and the upper bearing 32 of the housing 23, and then flows into the high-pressure space S1 and the crank chamber 23a. The lubricating oil that has flowed into the high-pressure space S1 returns to the oil reservoir space 10a. The lubricating oil that has flowed into the crank chamber 23a flows into the high-pressure space S1 via the oil discharge passage 23b and returns to the oil pool space 10a. The lubricating oil flowing through the first auxiliary oil supply passage 61a lubricates the sliding portion between the crankshaft 17 and the upper end bearing 26c of the movable scroll 26, and then flows into the crank chamber 23a and passes through the oil discharge passage 23b. Flows into the high-pressure space S1 and returns to the oil sump space 10a.

  The lubricating oil that has moved up to the upper end of the main oil supply passage 61 and reached the oil chamber 83 flows through the oil supply holes 63 and is supplied to the oil groove 24e due to the differential pressure. Part of the lubricating oil supplied to the oil groove 24e leaks into the low pressure space S2 and the compression chamber 40 while sealing the thrust sliding surface 24d. At this time, the leaked high-temperature lubricating oil heats the low-temperature refrigerant gas existing in the low-pressure space S2 and the compression chamber 40. The lubricating oil in the low pressure space S2 flows into the compression chamber 40 together with the refrigerant. The lubricating oil that has flowed into the compression chamber 40 is mixed with the compressed refrigerant in the form of minute oil droplets. The lubricating oil mixed in the compressed refrigerant flows from the compression chamber 40 into the high-pressure space S1 through the same path as the compressed refrigerant. Thereafter, the lubricant oil collides with the oil separation plate 62 after descending the core cut passage 55 together with the compressed refrigerant. The lubricating oil adhering to the oil separation plate 62 falls in the high pressure space S1 and returns to the oil reservoir space 10a.

(4) Features of scroll compressor (4-1)
In the scroll compressor 101 of this embodiment, the suction pipe 19 is fixed to the casing 10 via a pipe joint 80, an external pipe 82, and a suction connection pipe 84. In FIG. 8, the first distance D1 is limited to 30% or less of the second distance D2. Since the second distance D2 is a value that is fixed according to the specifications of the pipe joint 80, the scroll compressor 101 has an allowable range of the first distance D1 set on the basis of the second distance D2. Become. That is, the pipe joint 80 is fixed to the casing 10 so that the stepped portion 80 b of the pipe joint 80 is positioned in the vicinity of the upper surface 12 a of the casing 10 in the axial direction (vertical direction) of the pipe joint 80. Thereby, generation | occurrence | production of the malfunction at the time of brazing the external piping 82 to the piping joint 80 is suppressed.

  Here, two types of problems that may occur when the stepped portion 80b of the pipe joint 80 is not located near the upper surface 12a of the casing 10 in the axial direction of the pipe joint 80 will be described.

  First, in the vertical direction, when the end of the external pipe 82 is too far away from the upper surface 12a of the casing 10 toward the outside of the casing 10 (upper side in the vertical direction), the pipe joint 80 and the external pipe 82 are brazed. When the joining portion is heated by a burner or the like, heat is unlikely to escape from the joining portion, the brazing material may be overheated and the liquid brazing material may leak into the casing 10. As a result, the amount of brazing material used may increase, or the brazing material drooped and hardened inside the casing 10 may be peeled off and sucked into the compression chamber 40 to damage the compression mechanism 15.

  Secondly, when the end of the external pipe 82 is too far away from the upper surface 12a of the casing 10 toward the inside of the casing 10 (downward in the vertical direction), the pipe joint 80 and the external pipe 82 are joined at the time of brazing. When the part is heated with a burner or the like, part of the heat applied to the joint part escapes to the casing 10 and the brazing material may not be heated sufficiently. Further, since the joint near the end of the external pipe 82 cannot be directly heated, the end of the external pipe 82 may not be brazed appropriately.

  In the present embodiment, in order to suppress the above problems, the pipe joint 80 is connected to the casing so that the stepped portion 80b of the pipe joint 80 is positioned in the vicinity of the upper surface 12a of the casing 10 in the axial direction of the pipe joint 80. 10 is fixed. As a result, when the external pipe 82 is brazed to the pipe joint 80, the brazing material leaks into the casing 10 due to overheating of the brazing material, and the brazing heat escapes to the casing 10 and brazing is not possible. Occurrence of sufficient defects is suppressed.

  Therefore, the scroll compressor 101 has a structure capable of appropriately brazing the pipe using an optimal amount of brazing material.

(4-2)
In the scroll compressor 101 of the present embodiment, the first distance D1 is a distance between the reference point 12c shown in FIG. 8 and the stepped portion 80b of the pipe joint 80 in the vertical direction. The reference point 12c is a point closest to the center of the upper surface 12a viewed along the vertical direction on the upper surface 12a on the outer periphery of the upper surface opening 12b of the casing 10.

  As shown in FIG. 5, the upper surface 12 b of the casing 10 has a shape in which the center portion is located upward in the vertical direction compared to the end portion and is convex upward. Therefore, as shown in FIG. 5, when the upper surface opening 12b is formed at a position away from the center of the upper surface 12b, the reference point 12c for measuring the first distance D1 is on the outer periphery of the upper surface opening 12b. It is preferable to use a point near the center (reference point 12c in FIG. 8) that is located at the uppermost position in the vertical direction.

  If the point 12d shown in FIG. 8, that is, the point 12d located on the outer periphery of the upper surface opening 12b and positioned at the lowermost position in the vertical direction is used as a reference point for measuring the first distance D1. At the reference point 12c, the stepped portion 80b of the pipe joint 80 is in a state of deeply entering the casing 10. As a result, when the external pipe 82 is brazed to the pipe joint 80, part of the heat applied to the joint portion easily escapes to the casing 10. Therefore, as the reference point 12c for measuring the first distance D1, it is preferable to use a point closest to the center of the upper surface 12a on the upper surface 12a on the outer periphery of the upper surface opening 12b of the casing 10. Thereby, when brazing the external piping 82 to the piping joint 80, the scroll compressor 101 effectively suppresses the problem that the heat at the time of brazing escapes to the casing 10 and brazing becomes insufficient. it can.

(4-3)
In the scroll compressor 101 of the present embodiment, the pipe joint 80 has an inner part 80c and an outer part 80d. In the pipe joint 80, the inner side portion 80c is a portion that is thicker than the other portion inside the casing 10 (lower in the vertical direction) than the stepped portion 80b. The inner portion 80c, which is a thick portion of the pipe joint 80, is a portion where heat at the time of brazing is difficult to escape when the pipe joint 80 and the external pipe 82 are brazed. Therefore, the scroll compressor 101 uses the pipe joint 80 having the inner portion 80c, so that when the external pipe 82 is brazed to the pipe joint 80, heat at the time of brazing escapes to the casing 10 and brazing is not possible. Insufficient defects can be effectively suppressed.

(5) Modifications Modifications applicable to the embodiment of the present invention will be described.

(5-1) Modification A
In the embodiment, as shown in FIG. 8, the stepped portion 80 b of the pipe joint 80 is positioned above the upper surface 12 a of the casing 10 in the vertical direction. However, the stepped portion 80b may be positioned below the upper surface 12a in the vertical direction. FIG. 10 is a cross-sectional view similar to FIG. 8 when the stepped portion 80b is positioned below the top surface 12a in the vertical direction.

  In FIG. 10, the stepped portion 80 b of the pipe joint 80 is located inside the casing 10 (lower in the vertical direction) than the upper surface 12 a of the casing 10. Also in FIG. 10, the first distance D1 is defined as the distance between the stepped portion 80b and the upper surface 12a in the vertical direction. Similar to the embodiment, also in FIG. 10, the first distance D1 is limited to 30% or less of the second distance D2.

  Also in this modification, the occurrence of problems when brazing the external pipe 82 to the pipe joint 80 is suppressed by limiting the axial position of the pipe joint 80 in the same manner as in the embodiment.

(5-2) Modification B
In the embodiment and Modification A, the first distance D1 is limited to 30% or less of the second distance D2. From the viewpoint of suppressing the occurrence of problems when brazing the external pipe 82 to the pipe joint 80, the first distance D1 is preferably as short as possible and more preferably zero. When the first distance D1 is zero, the stepped portion 80b of the pipe joint 80 is at the same height as the upper surface 12a of the casing 10 in the vertical direction.

  In the present modification, the first distance D1 is limited to 10% or less of the second distance D2 as compared with the embodiment. That is, in the case where the stepped portion 80b of the pipe joint 80 is positioned above the upper surface 12a of the casing 10 in the vertical direction, the stepped portion 80b of the pipe joint 80 in the vertical direction is compared to the casing 10 in the vertical direction. It is located closer to the upper surface 12a.

  In this modification, compared with the embodiment, when the stepped portion 80b of the pipe joint 80 is located outside the casing 10 with respect to the upper surface 12a of the casing 10, the stepped portion 80b and the upper surface 12a in the vertical direction The distance between is more limited. Therefore, the scroll compressor 101 of the present modification is more effective than the embodiment in that the brazing material leaks into the casing due to overheating of the brazing material when the external pipe 82 is brazed to the pipe joint 80. Can be suppressed.

(5-3) Modification C
In the embodiment and Modification A, the first distance D1 is limited to 30% or less of the second distance D2. In Modification A, as shown in FIG. 10, the stepped portion 80 b of the pipe joint 80 is located on the inner side (lower in the vertical direction) of the casing 10 than the upper surface 12 a of the casing 10.

  In the present modification, in Modification A, the first distance D1 is limited to 10% or less of the second distance D2. That is, in the case where the stepped portion 80b of the pipe joint 80 is positioned below the upper surface 12a of the casing 10 in the vertical direction, the stepped portion 80b of the pipe joint 80 in the vertical direction is compared with the modification A in the casing. 10 is located closer to the upper surface 12a.

  In the present modification, as compared with Modification A, when the stepped portion 80b of the pipe joint 80 is located inside the casing 10 relative to the upper surface 12a of the casing 10, the stepped portion 80b and the upper surface 12a in the vertical direction. The distance between is more limited. Therefore, in the scroll compressor 101 of this modification, when brazing the external pipe 82 to the pipe joint 80, the heat at the time of brazing escapes to the casing 10 and the brazing is insufficient as compared with the modification A. Can be effectively suppressed.

(5-4) Modification D
In the embodiment and other modified examples, when the suction pipe 19 is fixed to the casing 10 of the scroll compressor 101 via the pipe joint 80, the position of the pipe joint 80 in the axial direction is limited, so that the external pipe Generation | occurrence | production of the malfunction at the time of brazing 82 to the piping joint 80 is suppressed. However, the embodiment and other modified examples may be applied to a process of fixing a suction pipe of a refrigerant circuit to a compressor other than the scroll compressor 101, for example, a casing of a rotary compressor.

  Also in this modified example, by restricting the position of the member corresponding to the pipe joint 80 in the same manner as in the embodiment, the occurrence of problems when the pipes are brazed and joined is suppressed.

(5-5) Modification E
In the embodiment and other modified examples, when the suction pipe 19 is fixed to the casing 10 of the scroll compressor 101 via the pipe joint 80, the position of the pipe joint 80 in the axial direction is limited, so that the external pipe Generation | occurrence | production of the malfunction at the time of brazing 82 to the piping joint 80 is suppressed. However, the embodiment and other modifications may be applied to the process of fixing the discharge pipe 20 to the casing 10 of the scroll compressor 101. In this case, the discharge pipe 20 is fixed to the casing 10 via a member corresponding to the pipe joint 80 of the embodiment.

  FIG. 11 is a longitudinal sectional view of the vicinity of the pipe joint 180 when the discharge pipe 20 is fixed to the body casing portion 11 of the casing 10 via the pipe joint 180 in the present modification. In FIG. 11, the surface of the trunk casing portion 11 outside the casing 10 is referred to as a trunk casing portion outer surface 11 a. The pipe joint 180 corresponds to the pipe joint 80 in the embodiment, and the discharge pipe 20 corresponds to the external pipe 82 in the embodiment.

  As shown in FIG. 11, the discharge pipe 20 is fixed to the trunk casing portion 11 via a pipe joint 180. The pipe joint 180 has a stepped portion 180b corresponding to the stepped portion 80b of the pipe joint 80 of the embodiment. The inner diameter of the pipe joint 180 decreases at the stepped portion 180b from the outer side to the inner side of the casing 10. The step portion 180 b is a plane orthogonal to the axial direction of the pipe joint 180. The pipe joint 180 is inserted into a hole formed in the trunk casing portion 11 and fixed to the trunk casing portion 11 by welding. The discharge pipe 20 is inserted into the pipe joint 180 from the outside of the casing 10. In the process of inserting the discharge pipe 20, when the end of the discharge pipe 20 comes into contact with the stepped portion 180b of the pipe joint 180, the discharge pipe 20 can be further inserted into the pipe joint 180 as shown in FIG. Disappear. In this state, the discharge pipe 20 is fixed to the pipe joint 180 by brazing. Thus, the stepped portion 180b of the pipe joint 180 functions as a stopper portion that regulates the position where the discharge pipe 20 is fixed.

  FIG. 11 shows the third distance D3 and the fourth distance D4. The third distance D3 is a distance between the trunk casing outer surface 11a and the stepped portion 180b of the pipe joint 180 in the axial direction of the pipe joint 180. In FIG. 11, the stepped portion 180b is located on the outer side of the casing 10 with respect to the outer surface 11a of the trunk portion casing portion. The fourth distance D4 is a dimension in the axial direction of the discharge pipe 20 inside the pipe joint 180. That is, the fourth distance D4 is a dimension of a part of the discharge pipe 20 that is inserted into the pipe joint 180. The third distance D3 corresponds to the first distance D1 in the embodiment, and the fourth distance D4 corresponds to the second distance D2 in the embodiment.

  In the present modification, as in the embodiment, the third distance D3 is limited to 30% or less of the fourth distance D4. Thereby, generation | occurrence | production of the malfunction at the time of brazing the discharge pipe 20 to the piping joint 180 is suppressed.

  In addition, in FIG. 11, the level | step-difference part 180b is located in the outer side of the casing 10 rather than the trunk | drum casing outer surface 11a. However, the stepped portion 180b may be located on the inner side of the casing 10 with respect to the outer surface 11a of the trunk portion casing portion. Similarly to the modified examples B and C, the third distance D3 may be limited to 10% or less of the fourth distance D4.

  Further, the embodiment and other modified examples may be applied to the process of fixing the injection pipe to the casing 10 of the scroll compressor 101. The injection pipe is a pipe fixed to the casing 10, and a part of the gas refrigerant separated by the gas-liquid separator connected to the refrigerant circuit is injected into the compression chamber 40 inside the compression mechanism 15 and compressed. It is a member for improving the refrigerating capacity of the scroll compressor 101 by lowering the internal temperature of the mechanism 15. In this case, the injection pipe is fixed to the casing 10 via members corresponding to the pipe joint 80, the external pipe 82, and the suction connection pipe 84.

  Also in this modified example, by restricting the position of the member corresponding to the pipe joint 80 in the same manner as in the embodiment, the occurrence of problems when the pipes are brazed and joined is suppressed.

(5-6) Modification F
In the scroll compressor 101 of the embodiment, the suction pipe 19 for guiding the refrigerant to the compression mechanism 15 is fixed to the external pipe 82 via the suction connection pipe 84. However, the suction pipe 19 may be directly fixed to the external pipe 82 by brazing. In this case, a member in which the suction pipe 19 of the embodiment and the suction connection pipe 84 are integrated is used as the suction pipe 19.

  The compressor according to the present invention has a structure capable of appropriately brazing a pipe using an optimal amount of brazing material.

10 Casing 12a Upper surface (outer surface)
12b Upper surface opening (opening)
15 Compression mechanism 19 Suction pipe 80 Piping joint 80b Step part (stopper part)
80c Inner part 80d Outer part 82 External piping 101 Scroll compressor (compressor)
D1 1st distance D2 2nd distance

JP 2003-206873 A

Claims (5)

A casing (10) having an outer surface (12a) in which an opening (12b) is formed;
A pipe joint (80) which is a tubular member fixed to the casing at the opening;
An external pipe (82) inserted into the pipe joint and fixed to the pipe joint by brazing;
With
The pipe joint has a stopper portion (80b) that regulates a position where the external pipe inserted into the pipe joint is fixed,
In the axial direction of the pipe joint, a first distance (D1) that is a distance between the outer surface and the stopper portion on the outer periphery of the opening is a dimension in the axial direction of the external pipe inside the pipe joint. 30% or less of the second distance (D2),
Compressor (101). The first distance is
In the axial direction, when the stopper portion is located outside the casing with respect to the outer surface, it is 30% or less of the second distance,
In the axial direction, when the stopper portion is located inside the casing with respect to the outer surface, it is 10% or less of the second distance.
The compressor according to claim 1. The outer surface is an upper surface of the casing;
The first distance is a distance between the outer surface on the outer periphery of the opening and closest to the center of the outer surface, and the stopper portion.
The compressor according to claim 1 or 2. The pipe joint includes, in the axial direction, an inner portion (80c) that is a portion inside the casing with respect to the stopper portion, and an outer portion (80d) that is a portion outside the casing with respect to the stopper portion. Have
The thickness of the inner part is larger than the thickness of the outer part,
The compressor according to any one of claims 1 to 3. A compression mechanism (15) housed in the casing and compresses the refrigerant;
A suction pipe (19) for guiding refrigerant from the outside of the casing to the compression mechanism;
Further comprising
The suction pipe is inserted into the external pipe and fixed to the external pipe by brazing.
The compressor according to any one of claims 1 to 4.

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