WO2020202493A1

WO2020202493A1 - Metal fitting, hermetic-type compressor, and method for manufacturing hermetic-type compressor

Info

Publication number: WO2020202493A1
Application number: PCT/JP2019/014777
Authority: WO
Inventors: 大貴山口; 康之赤堀; 聡大清水
Original assignee: 三菱電機株式会社
Priority date: 2019-04-03
Filing date: 2019-04-03
Publication date: 2020-10-08

Abstract

This metal fitting is used to secure a suction muffler to a hermetic container of a hermetic-type compressor, wherein: the metal fitting comprises a base portion secured to the hermetic container, a contact portion secured to the suction muffler, and an extending portion that connects the base portion and the contact portion; the contact portion has a first contact portion and a second contact portion that are disposed on either side of the base portion; the first contact portion and the second contact portion are each formed into a shape such that opposing surface portions, which oppose the outer peripheral wall of the suction muffler, curve along the circumferential direction of the outer peripheral wall; and formed in the opposing surface portions are one or more protuberances that protrude and that are used in projection welding with the outer peripheral wall.

Description

Manufacturing method of fixing bracket, sealed compressor, and sealed compressor

According to the present invention, a fixing bracket for fixing a suction muffler to a closed container of a closed compressor, a closed compressor provided with the fixing bracket, and a closed compressor for fixing the suction muffler to the closed container using the fixing bracket. Regarding the manufacturing method of.

Conventionally, regarding a method of fixing a closed container of a closed compressor and a suction muffler, for example, a method of using a fastening member such as a band, a screw, a rivet, or welding or brazing such as arc welding has been disclosed. (See, for example, Patent Document 1). Further, a method is also disclosed in which a fixing metal fitting provided with an energized portion such as a protrusion and a suction muffler are brought into close contact with each other and sandwiched between electrodes, and the suction muffler and the fixing metal fitting attached to a closed container are fixed by projection welding. (See, for example, Patent Document 2).

Japanese Unexamined Patent Publication No. 60-65289 International Publication No. 2017/154806

However, the method of fixing the closed compressor and the suction muffler described in Patent Document 1 requires auxiliary materials such as a band, a screw, a shield gas, or a welding rod, and the manufacturing cost of the closed compressor is high. There was a problem. Further, in the method of fixing the closed compressor and the suction muffler described in Patent Document 1, when arc welding is used, the amount of heat input due to welding is large, so that the base material of the suction muffler is thinned and has holes, etc. May occur and the welding strength may decrease. Therefore, in the method of fixing the closed compressor and the suction muffler, when arc welding is used, there is a problem that welding cannot be performed except for a thick material of the suction muffler.

Further, in Patent Document 2, in projection welding between a suction muffler fixing bracket attached to a closed container and a suction muffler, two protrusions provided on the suction muffler fixing bracket or in the axial direction of the suction muffler It is described that the bent portion of the parallel suction muffler fixing bracket is used. However, if the outer diameter roundness of the suction muffler is large, or if the posture of the suction muffler is tilted during projection welding, the suction muffler and the protrusions of the suction muffler fixing bracket may not come into contact with each other. However, if the outer diameter roundness of the suction muffler is large, or if the posture of the suction muffler is tilted during projection welding, the suction muffler will be added when the suction muffler and the protrusion of the suction muffler fixing bracket are melted. Pressure can cause slippage and make projection welding difficult.

Further, in the method described in Patent Document 2, a hemispherical protrusion is provided on the suction muffler fixing bracket as a protrusion used for projection welding. In the hemispherical protrusion, the protrusion of the suction muffler fixing bracket sinks into the suction muffler during pressurization, so that there is a restriction on welding conditions in which the applied pressure cannot be increased. Therefore, in the method described in Patent Document 2, spatter at the time of projection welding is likely to be scattered, and the suction muffler may be thinned. Therefore, there is a problem that the reliability of fixing the suction muffler and the closed compressor is low.

The present invention solves the above-mentioned problems, and manufactures a fixing bracket, a closed compressor, and a closed compressor that can ensure the reliability of fixing the suction muffler and the closed compressor. The purpose is to provide.

The fixing bracket according to the present invention is a fixing bracket for fixing the suction muffler to the closed container of the closed compressor, and has a base portion fixed to the closed container, a contact portion fixed to the suction muffler, and a contact portion. It is provided with an extension portion that connects the foundation portion and the contact portion, and the contact portion has a first contact portion and a second contact portion that are arranged on both sides of the foundation portion, and the first contact portion is provided. The contact portion and the second contact portion are formed in a curved shape in which the facing surface portion facing the outer peripheral wall of the suction muffler is curved along the circumferential direction of the outer peripheral wall, and the facing surface portion is projected with the outer peripheral wall. At least one or more protruding protrusions used for welding are formed.

Further, the sealed compressor according to the present invention is provided with the above-mentioned fixing bracket.

Further, the method for manufacturing a closed compressor according to the present invention includes a suction muffler arranging step of arranging a suction muffler so as to come into contact with the protrusion of the fixing bracket described above, and a first electrode in contact with the abutting portion. And the electrode placement step of arranging the second electrode in contact with the suction muffler and the pressurization step of moving the second electrode and applying pressure to the suction muffler to apply pressure to the protrusions. Along with the pressure step, a fixing step of passing a current through the protrusion to melt the protrusion and fixing the suction muffler to the fixing bracket is provided.

According to the present invention, the fixing bracket has a contact portion for being fixed to the suction muffler, and this contact portion is a first contact portion arranged on both sides of a base portion fixed to a closed container. It has a second contact portion. The first contact portion and the second contact portion are formed so that the facing surface portions facing the outer peripheral wall of the suction muffler are curved along the circumferential direction of the outer peripheral wall, and the facing surface portions are formed with the outer peripheral wall. At least one or more protrusions used for projection welding of the above are formed. Therefore, at the time of projection welding between the fixing bracket and the suction muffler, the posture inclination of the suction muffler is corrected, the slip of the suction muffler at the time of projection welding can be suppressed, and the protrusion always comes into contact with a part of the suction muffler in the outer peripheral direction. As a result, according to the present invention, the reliability of fixing the suction muffler and the closed compressor can be ensured.

It is external drawing which shows typically the example of the closed type compressor which concerns on embodiment. It is the schematic which shows an example of the internal structure of the closed type compressor which concerns on embodiment. It is a schematic view in the top view of the fixing metal fitting for the suction muffler fixed between the closed container and the suction muffler of FIG. It is a top view which shows the appearance of the fixing metal fitting for the suction muffler of the closed type compressor which concerns on embodiment. It is a front view of the fixing metal fitting for a suction muffler of FIG. It is a rear view of the fixing metal fitting for a suction muffler of FIG. It is a top view which shows the appearance of the fixing metal fitting for a suction muffler of the modification of the closed type compressor which concerns on embodiment. It is the schematic which shows an example of the manufacturing method of the closed type compressor which concerns on embodiment. It is a flow chart which shows an example of the manufacturing method of the closed type compressor which concerns on embodiment.

Embodiment.
FIG. 1 is an external view schematically showing an example of the sealed compressor 1 according to the embodiment. FIG. 2 is a schematic view showing an example of the internal configuration of the sealed compressor 1 according to the embodiment. The configuration of the closed compressor 1 according to the embodiment will be described with reference to FIGS. 1 and 2. The closed compressor 1 is used in a refrigerating cycle device such as an air conditioner, and is an element constituting a refrigerant circuit of the refrigerating cycle device.

Hereinafter, the manufacturing method of the suction muffler fixing bracket 20, the closed type compressor 1, and the closed type compressor 1 according to the embodiment will be described with reference to the drawings. In the following drawings including FIG. 1, the relationship and shape of the dimensions of each component may differ from the actual ones. Further, in the following drawings, the same or similar members or parts are designated by the same reference numerals, or the reference numerals are omitted. In addition, the positional relationship between the constituent members of the closed compressor 1 in the following description, for example, the positional relationship such as the vertical relationship, is, in principle, the positional relationship when the closed compressor 1 is installed in a usable state. And. In order to facilitate understanding, terms indicating directions (for example, "top", "bottom", "right", "left", "front", "rear", etc.) are used as appropriate, but these notations are used. For convenience of explanation, it is described as such, and does not limit the arrangement and orientation of the device or component.

[Structure of sealed compressor 1]
The closed compressor 1 is a rolling piston type single rotary compressor, and is a fluid machine that discharges a low-pressure gas refrigerant sucked into the closed compressor 1 as a high-pressure gas refrigerant. The housing of the closed compressor 1 is composed of an iron closed container 2 formed in a cylinder shape. The closed container 2 is composed of a hollow cylindrical body portion 2a, a bottom portion 2b having a U-shaped vertical cross section, and a lid portion 2c having an inverted U-shaped vertical cross section, and the openings of the bottom portion 2b and the lid portion 2c. The outer surface of the body is fixed to the inner surface of the opening of the body portion 2a. The fixed portion between the body portion 2a and the bottom portion 2b and the fixed portion between the body portion 2a and the lid portion 2c are joined by, for example, arc welding or resistance welding.

A suction muffler 3 is arranged on the outside of the body portion 2a of the closed container 2. The suction muffler 3 is fixed to the body portion 2a of the closed container 2 via a suction muffler fixing bracket 20 arranged on the outer surface of the closed container 2. The suction muffler 3 has an upper container 3a and a lower container 3b, and has a cylindrical shape. The upper container 3a and the lower container 3b are fixed by welding, for example. An inflow pipe 3c penetrates the upper container 3a and is fixed to the top of the upper container 3a constituting the suction muffler 3. The inflow pipe 3c is a refrigerant pipe that allows a low-pressure gas refrigerant or a highly dry two-phase refrigerant to flow into the suction muffler 3. Further, one end of the suction pipe 4 penetrates through the bottom of the lower container 3b constituting the suction muffler 3 and is fixed by welding or the like, and the other end of the suction pipe 4 is a side surface of the body portion 2a of the closed container 2. It is fixed through the part.

The suction muffler 3 also has an accumulator function, and separates the refrigerant into a gas and a liquid by retaining a refrigerant storage function for storing excess refrigerant and a liquid refrigerant temporarily generated when the operating state changes. It has a gas-liquid separation function. Further, the suction muffler 3 also has a function as a muffler that reduces or eliminates noise generated by the refrigerant flowing in from the inflow pipe 3c. The gas-liquid separation function of the suction muffler 3 can prevent a large amount of liquid refrigerant from flowing into the closed container 2 and causing liquid compression in the closed compressor 1. The detailed configuration of the suction muffler fixing bracket 20 for connecting the closed container 2 and the suction muffler 3 will be described later.

The suction pipe 4 is a refrigerant pipe that sucks low-pressure gas refrigerant from the suction muffler 3 into the closed container 2. A fixing member 6 is arranged in the suction hole 5 formed in the body portion 2a of the closed container 2, and the suction pipe 4 is connected to the body of the closed container 2 via the fixing member 6 arranged in the suction hole 5. It is fixed to the portion 2a.

The fixing member 6 has, for example, a connecting pipe 6a and a ring 6b. One end of the connecting pipe 6a is inserted into the suction hole 5 and communicates with the inside of the closed container 2. The suction pipe 4 is inserted into the other end side of the connecting pipe 6a. The ring 6b is joined to the suction hole 5, is joined to the outer surface of the connecting pipe 6a and the airtight container 2, and seals the gap between the suction pipe 4 and the suction hole 5. In the closed type compressor 1, the airtightness inside the closed container 2 is ensured by the fixing member 6.

A discharge pipe 7 penetrates and is fixed to the upper surface of the lid 2c of the closed container 2. The discharge pipe 7 is a refrigerant pipe that discharges a high-pressure gas refrigerant to the outside of the closed container 2. The fixed portion between the discharge pipe 7 and the lid portion 2c is joined by, for example, brazing or resistance welding. Further, a glass terminal 8 is arranged on the upper surface of the lid portion 2c of the closed container 2. The glass terminal 8 provides an interface connected to an external power source. The external power supply is a power supply device that supplies electric power to the sealed compressor 1, and a general commercial AC power supply having an AC frequency of 50 Hz or 60 Hz, or an inverter power supply capable of changing the AC frequency is used.

The electric motor portion 10, the shaft 17, and the compression mechanism portion 30 are housed inside the closed container 2. The electric motor unit 10 is arranged above the arrangement position of the fixing member 6 in the closed container 2. The shaft 17 is arranged between the electric motor portion 10 and the compression mechanism portion 30 at the center of the closed container 2, and is provided so as to extend in the vertical direction between the electric motor portion 10 and the compression mechanism portion 30. The compression mechanism unit 30 is arranged so that the inside of the compression mechanism unit 30 communicates with the suction pipe 4. That is, inside the closed container 2, the electric motor unit 10 is arranged above the compression mechanism unit 30. Further, the hollow space inside the closed container 2 is filled with a high-pressure gas refrigerant compressed by the compression mechanism unit 30.

The electric motor unit 10 is configured as a motor that generates a rotational driving force on the shaft 17 using electric power supplied from an external power source and transmits the rotational driving force to the compression mechanism unit 30 via the shaft 17. The electric motor unit 10 includes a stator 12 having a hollow cylindrical appearance when viewed from above, and a cylindrical rotor 14 rotatably arranged inside the inner surface of the stator 12. The stator 12 is fixed to the inner side surface of the body portion 2a of the closed container 2 by shrink fitting or the like, and is connected to the glass terminal 8 via the lead wire 16. The electric motor unit 10 supplies the rotor 14 inside the inner surface of the stator 12 by supplying the electric power supplied from the external power source to the wound coil constituting the stator 12 via the lead wire 16. Can be rotated. In the closed compressor 1, for example, a DC brushless motor or the like is used as the electric motor unit 10.

A shaft 17 penetrates the rotor 14 and is fixed to the center of the rotor 14. The shaft 17 is a rotating shaft that fixes the rotor 14 on a fixed surface 17a that is a part of the outer surface of the shaft 17 and transmits the rotational driving force of the rotor 14 to the compression mechanism portion 30. The shaft 17 is provided so as to extend in the vertical direction from the fixed surface 17a, that is, in the direction of the lid portion 2c of the closed container 2 and the direction of the bottom portion 2b of the closed container 2.

Further, the shaft 17 has an eccentric portion 18 located below the fixed surface 17a and arranged at a position corresponding to the cylinder 31 inside the compression mechanism portion 30. A substantially cylindrical piston 36 rotatably attached along the outer surface of the eccentric portion 18 is arranged on the outer periphery of the eccentric portion 18. When the shaft 17 is rotated by the electric motor portion 10, the piston 36 rotates in the cylinder 31 along the inner peripheral surface thereof.

Further, in the sealed compressor 1, a centrifugal pump (not shown) may be arranged at the lower end of the shaft 17. The centrifugal pump can suck up the refrigerating machine oil 40 stored in the bottom 2b of the closed container 2. As the refrigerating machine oil 40, for example, mineral oil-based, alkylbenzene-based, polyalkylene glycol-based, polyvinyl ether-based, polyol ester-based lubricating oils and the like are used.

The compression mechanism unit 30 compresses the low-pressure gas refrigerant sucked into the low-pressure space of the closed container 2 from the suction pipe 4 into the high-pressure gas refrigerant by the rotational driving force supplied from the electric motor unit 10, and compresses the high-pressure gas. The refrigerant is discharged above the compression mechanism unit 30.

The compression mechanism unit 30 includes a hollow cylindrical cylinder 31. The outer surface of the cylinder 31 is fixed to the inner surface of the body portion 2a of the closed container 2 by arc welding such as arc spot welding or shrink fitting. The eccentric portion 18 of the shaft 17 and the piston 36 are housed in the space of the hollow portion surrounded by the inner side surface of the cylinder 31. The cylinder 31 is configured so that the eccentric portion 18 and the piston 36 of the shaft 17 can rotate eccentrically by the rotation of the shaft 17 in the hollow portion of the cylinder 31. A compression chamber is formed in the cylinder 31 by abutting one end of a vane 32 that reciprocates in the groove formed in the cylinder 31 in the radial direction with the outer peripheral wall of the piston 36.

The openings at both ends of the cylinder 31 in the axial direction are closed by the upper bearing 34 and the lower bearing 35. That is, the upper bearing 34 is arranged on the upper side of the cylinder 31, and the lower bearing 35 is arranged on the lower side of the cylinder 31. A shaft 17 penetrates the upper bearing 34, the cylinder 31, and the lower bearing 35. The upper bearing 34 and the lower bearing 35 are slide bearings that slidably support the shaft 17, and rotatably support the shaft 17. The upper bearing 34, the cylinder 31, and the lower bearing 35 are laminated in this order, and the upper and lower openings of the hollow portion of the cylinder 31 are closed by the upper bearing 34 and the lower bearing 35 to ensure airtightness in the hollow portion. .. The upper bearing 34 and the lower bearing 35 are fixed to the upper side and the lower side of the cylinder 31 by, for example, bolts or the like.

In the compression mechanism unit 30, the airtight space surrounded by the piston 36, the cylinder 31, the vane 32, the upper bearing 34, and the lower bearing 35 provides a compression chamber for compressing the low-pressure gas refrigerant sucked from the suction pipe 4. Constitute.

In the present embodiment, the closed type compressor 1 is configured as a vertical type compressor, but it may be configured as a horizontal type compressor. Further, in the present embodiment, the sealed compressor 1 is configured as a rolling piston type rotary compressor, but even if it is configured as a swing vane type swing compressor, it can be used as a screw compressor or a scroll compressor. It may be configured. Further, in the present embodiment, it is configured as a single rotary type rotary compressor, but it may be configured as a twin rotary type rotary compressor. Further, in the present embodiment, the closed type compressor 1 is a single-stage compressor and has only one compression mechanism unit 30, but the closed type compressor 1 is a multi-stage compressor and a plurality of compression mechanism parts. The refrigerant may be sequentially compressed by 30.

[Operation of closed compressor 1]
Next, the operation of the sealed compressor 1 of the present embodiment will be described. When the shaft 17 is rotated by the drive of the electric motor unit 10, the eccentric portion 18 and the piston 36 housed inside the cylinder 31 rotate eccentrically together with the shaft 17. The piston 36 moves while the outer peripheral surface of the piston 36 is in contact with the inner surface of the cylinder 31 in the hollow portion of the cylinder 31 due to the eccentric rotation of the eccentric portion 18 and the piston 36. The vane 32 arranged in the cylinder 31 moves in the radial direction of the cylinder 31 in conjunction with the eccentric rotation of the piston 36. The low-pressure gas refrigerant that has flowed into the compression mechanism unit 30 from the suction pipe 4 flows into a compression chamber that is a closed space surrounded by the piston 36, the cylinder 31, the vane 32, the upper bearing 34, and the lower bearing 35. The low-pressure gas refrigerant that has flowed into the inside of the compression chamber is compressed into the high-pressure gas refrigerant as the volume of the compression chamber decreases due to the eccentric rotation of the piston 36. The high-pressure gas refrigerant is discharged into the hollow space inside the closed container 2 through a discharge port (not shown) provided in the upper bearing 34. The high-pressure gas refrigerant discharged into the hollow space inside the closed container 2 passes through, for example, a gap between the stator 12 and the rotor 14 of the electric motor unit 10, and passes through the discharge pipe 7 to the closed container 2. It is discharged to the outside of.

[Details of fixing bracket 20 for suction muffler]
FIG. 3 is a schematic view of the suction muffler fixing bracket 20 fixed between the closed container 2 and the suction muffler 3 of FIG. 2 in a top view. FIG. 4 is a top view showing the appearance of the suction muffler fixing bracket 20 of the sealed compressor 1 according to the embodiment. FIG. 5 is a front view of the suction muffler fixing bracket 20 of FIG. FIG. 6 is a rear view of the suction muffler fixing bracket 20 of FIG. Note that FIG. 5 is a view when the suction muffler fixing bracket 20 is viewed from the suction muffler 3 side. FIG. 6 is a view when the suction muffler fixing bracket 20 is viewed from the closed container 2 side. The suction muffler fixing bracket 20 will be described with reference to FIGS. 3 to 6.

The suction muffler fixing bracket 20 is a fixing bracket for fixing the suction muffler 3 to the closed container 2 of the closed compressor 1. The suction muffler fixing bracket 20 is a metal plate material, and is formed by, for example, pressing. The suction muffler fixing bracket 20 has a foundation portion 21, an extension portion 22, and a contact portion 23. In the suction muffler fixing bracket 20, the base portion 21, the contact portion 23, the extension portion 22, and the protrusion 25 or the protrusion 28, which will be described later, are formed of a single press-processed plate material. ..

The foundation portion 21 is a portion of the suction muffler fixing bracket 20 that is attached to and fixed to the outer peripheral wall 2a1 of the closed container 2 of the closed compressor 1. The base portion 21 is a rectangular plate-shaped portion in the front view, and is a portion formed in a curved shape along the circumferential direction of the outer peripheral wall 2a1 of the closed container 2 in the top view. The plate-shaped foundation portion 21 has a first facing surface portion 21a and a second facing surface portion 21b forming the front surface and the back surface of the wall forming the foundation portion 21. The first facing surface portion 21a constitutes a surface facing the closed container 2 in the closed compressor 1. The second facing surface portion 21b constitutes a surface facing the suction muffler 3 in the closed compressor 1.

The foundation portion 21 is provided with a protrusion 24 for projection welding used for fixing to the closed container 2. The protrusion 24 is a hemispherical protrusion. The protrusion 24 is formed so as to bulge from the first facing surface portion 21a facing the closed container 2. The protrusion 24 has four protrusions. The first protrusion 24a, the second protrusion 24b, the third protrusion 24c, and the fourth protrusion 24d are arranged two by two in the vertical direction and two by two in the circumferential direction, and are virtual rectangles. It is arranged so as to be located at each of the four corners in the shape. However, the number of protrusions 24 formed is not limited to four.

The extension portion 22 is a portion of the suction muffler fixing bracket 20 that connects the foundation portion 21 and the contact portion 23. The extension portion 22 is provided so as to rise from both ends of the foundation portion 21 in the circumferential direction of the closed container 2. The extension portion 22 is provided so as to extend between the closed container 2 and the suction muffler 3 in the closed compressor 1. The extension portion 22 is formed integrally with the foundation portion 21 by bending from the end portion of the foundation portion 21. Further, the extension portion 22 is formed as a plate-shaped member continuously with the foundation portion 21.

The extension portion 22 has a first extension portion 22a and a second extension portion 22b. The first extending portion 22a is formed so as to extend from the first end portion 21d, which is one end in the extending direction of the base portion 21, in the circumferential direction of the closed container 2. The second extending portion 22b is formed so as to extend from the second end portion 21e, which is the other end portion in the extending direction of the base portion 21, in the circumferential direction of the closed container 2. The first extension portion 22a and the foundation portion 21 are formed in an L shape in a top view, and the second extension portion 22b and the foundation portion 21 are formed in an inverted L shape in a top view. .. As shown in FIG. 4, the first extension portion 22a and the second extension portion 22b are formed so that the distance between them increases from the foundation portion 21 toward the tip end side. The first extension portion 22a and the second extension portion 22b are not limited to those formed so that the distance between them increases from the foundation portion 21 toward the tip end side. For example, the first extension portion 22a and the second extension portion 22b may be formed so as to be parallel to each other in the direction of rising and extending from the foundation portion 21. The extension portion 22 is arranged between the foundation portion 21 and the contact portion 23, and serves to connect the foundation portion 21 and the contact portion 23. That is, the extension portion 22 has the foundation portion 21 on one end side and the contact portion 23 on the other end side in the direction of rising and extending from the foundation portion 21.

The contact portion 23 is a portion of the suction muffler fixing bracket 20 that is attached and fixed to the outer peripheral wall 3d of the cylindrical suction muffler 3. The contact portion 23 is provided at the end portion on the tip end side of the extension portion 22 that rises and extends from the foundation portion 21 in the top view. The contact portion 23 is bent from the end portion of the extension portion 22 to be integrally formed with the extension portion 22. Further, the contact portion 23 is formed as a plate-shaped member continuously with the extension portion 22. The contact portion 23 is a rectangular plate-shaped member when viewed from the front side of the suction muffler 3, and is formed in a curved shape along the circumferential direction of the outer peripheral wall 3d of the suction muffler 3 when viewed from above. The contact portion 23 is fixed to the outer peripheral wall 3d of the suction muffler 3 by projection welding. In the contact portion 23, it is desirable that the third facing surface portion 23a1 and the fourth facing surface portion 23b1 facing the outer peripheral wall 3d of the suction muffler 3 are in close contact with the outer peripheral wall 3d, but there is a gap between the contact portion 23 and the outer peripheral wall 3d. Is formed, the gap is 1 mm or less. The third facing surface portion 23a1 and the fourth facing surface portion 23b1 will be described later.

The contact portion 23 has a first contact portion 23a and a second contact portion 23b arranged on both sides of the foundation portion 21. The first contact portion 23a is formed so as to extend from the third end portion 22d, which is the tip end portion in the direction in which the first extension portion 22a extends. The second contact portion 23b is formed so as to extend from the fourth end portion 22e, which is the tip end portion in the direction in which the second extension portion 22b extends. The first contact portion 23a and the first extension portion 22a are formed in an inverted L shape when viewed from above, and the second contact portion 23b and the second extension portion 22b are L-shaped when viewed from above. It is formed in a shape. As shown in FIG. 4, the first contact portion 23a and the second contact portion 23b are arranged so that the distance between them increases from the extension portion 22 on the foundation portion 21 side toward the tip side. It is formed. Further, the first contact portion 23a and the second contact portion 23b are attached to the outer peripheral wall 3d of the suction muffler 3 so as to face the curved surface of the semi-cylindrical portion on the closed container 2 side.

The contact portion 23 is provided with a protrusion 25 for projection welding used for fixing to the suction muffler 3. The protrusion 25 is a linear protrusion provided between the extension 22 and the tip of the contact 23. The protrusion 25 is formed so as to extend perpendicular to the axial direction S of the suction muffler 3. Further, the protrusion 25 is formed in a curved shape so as to bulge toward the suction muffler 3 in a cross section perpendicular to the extending direction T. The extending direction T of the protrusion 25 is formed so as to be in a twisted position perpendicular to the axial direction S of the suction muffler 3. More specifically, the protrusion 25 has a ridge 25r which is a series of vertices located at the tip in the protrusion direction. The ridge line portion 25r is the most protruding portion of the protrusion 25, and is a portion that comes into contact with the outer peripheral wall 3d of the suction muffler 3 in projection welding. The protrusion 25 has a ridge line portion 25r formed in a straight line when viewed from above. That is, the ridge line portion 25r is formed to be linear when viewed from the axial direction S of the suction muffler 3 formed in a cylindrical shape. Further, the ridge line portion 25r is formed in a linear shape when viewed from a direction perpendicular to the axial direction S of the suction muffler 3 formed in a cylindrical shape. The extending direction of the ridge line portion 25r is formed so as to be in a twisted position perpendicular to the axial direction S of the suction muffler 3.

The protrusion 25 is formed on the contact portion 23 by, for example, press working. Four protrusions 25 are formed in the suction muffler fixing bracket 20. The protrusion 25 is formed so as to bulge from the third facing surface portion 23a1 facing the outer peripheral wall 3d of the suction muffler 3 at the first contact portion 23a. The first contact portion 23a is formed so that the third facing surface portion 23a1 facing the outer peripheral wall 3d of the suction muffler 3 is curved along the circumferential direction of the outer peripheral wall 3d. At least one or more protruding protrusions 25 used for projection welding with the outer peripheral wall 3d are formed on the third facing surface portion 23a1. The first contact portion 23a has an upper first protrusion 25a and a lower first protrusion 25b as protrusions 25. The upper first protrusion 25a and the lower first protrusion 25b are formed between the third end 22d of the first extension 22a and the tip 23d of the first contact 23a. Further, the upper first protrusion 25a and the lower first protrusion 25b are formed side by side in the vertical direction, that is, in the axial direction S of the suction muffler 3.

The protrusion 25 is formed so as to bulge from the fourth facing surface portion 23b1 facing the outer peripheral wall 3d of the suction muffler 3 at the second contact portion 23b. The second contact portion 23b is formed so that the fourth facing surface portion 23b1 facing the outer peripheral wall 3d of the suction muffler 3 is curved along the circumferential direction of the outer peripheral wall 3d. At least one or more protruding protrusions 25 used for projection welding with the outer peripheral wall 3d are formed on the fourth facing surface portion 23b1. The second contact portion 23b has an upper second protrusion 25c and a lower second protrusion 25d as the protrusion 25. The upper second protrusion 25c and the lower second protrusion 25d are formed between the fourth end 22e of the second extension 22b and the tip 23e of the second contact 23b. Further, the upper second protrusion 25c and the lower second protrusion 25d are formed side by side in the vertical direction, that is, in the axial direction S of the suction muffler 3. The protrusion 25 is formed so that the height of the protrusion 25 protruding from the third facing surface portion 23a1 and the fourth facing surface portion 23b1 is less than the plate thickness of the contact portion 23.

However, the number of protrusions 25 formed is not limited to four. As described above, the protrusion 25 is the suction muffler fixing bracket 20 such as the upper first protrusion 25a and the lower first protrusion 25b, and the upper second protrusion 25c and the lower second protrusion 25d. Two are arranged in the vertical direction. However, one protrusion 25 may be formed on each of the first contact portion 23a and the second contact portion 23b, or three or more protrusions 25 may be formed in the vertical direction of the suction muffler fixing bracket 20. ..

FIG. 7 is a top view showing the appearance of the suction muffler fixing bracket 20A of the modified example of the sealed compressor 1 according to the embodiment. The parts having the same configuration as the suction muffler fixing bracket 20 of FIGS. 1 to 6 are designated by the same reference numerals, and the description thereof will be omitted. The shape of the protrusion 28 of the suction muffler fixing bracket 20A is different from the shape of the protrusion 25 of the suction muffler fixing bracket 20. The protrusion 28 has a ridge 28r that is a series of vertices located at the tip in the protrusion direction. The ridge line portion 28r is the most protruding portion of the protrusion 28, and is a portion that comes into contact with the outer peripheral wall 3d of the suction muffler 3 in projection welding. The protrusion 28 is formed in a shape in which the ridge line portion 28r is curved along the circumferential direction of the outer peripheral wall 3d of the suction muffler 3 in a top view. The ridge line portion 28r is formed in a curved shape along the circumferential direction of the outer peripheral wall 3d of the suction muffler 3 when viewed from the axial direction S of the suction muffler 3 formed in a cylindrical shape. Further, the ridge line portion 28r is formed in a linear shape when viewed from a direction perpendicular to the axial direction S of the suction muffler 3 formed in a cylindrical shape. The ridge line portion 28r is formed so as to be in a twisted position perpendicular to the axial direction S of the suction muffler 3. The structure of the ridge line portion 28r of the protrusion 28 is different only in the structure of the ridge line portion 25r of the protrusion 25, and the other basic structures are the same as the structure of the protrusion 25.

[Manufacturing method of sealed compressor 1]
FIG. 8 is a schematic view showing an example of a manufacturing method of the sealed compressor 1 according to the embodiment. FIG. 9 is a flow chart showing an example of a manufacturing method of the sealed compressor 1 according to the embodiment. In FIG. 8, the pressurizing direction at the time of manufacturing the closed compressor 1 is shown by a solid arrow. The protrusion 25 shown in FIG. 8 is a protrusion 28 when the suction muffler fixing bracket 20A of the modified example is used. The fixing of the suction muffler 3 and the suction muffler fixing bracket 20 in the method of manufacturing the sealed compressor 1 will be described with reference to FIGS. 8 and 9. As a premise of welding the suction muffler 3 and the suction muffler fixing bracket 20, the suction muffler fixing bracket 20 is fixed to the closed container 2 by projection welding.

In the method of manufacturing the sealed compressor 1, first, the suction muffler 3 is arranged with respect to the suction muffler fixing bracket 20 so that the outer peripheral wall 3d of the suction muffler 3 comes into contact with the protrusion 25 or the protrusion 28. It has a muffler arrangement step (step S1).

Then, the first electrode 110 having a shape along the contact portion 23 of the suction muffler fixing bracket 20 is arranged in a manner of supporting the contact portion 23 below the contact portion 23. The first electrode 110 is arranged so as to come into contact with a surface located on the opposite side of the third facing surface portion 23a1 and the fourth facing surface portion 23b1 on which the protrusion 25 or the protrusion 28 is formed. Next, the second electrode 120 having a shape along the outer peripheral wall 3d of the suction muffler 3 is arranged so as to come into contact with the outer peripheral wall 3d of the suction muffler 3 on the side opposite to the side where the suction muffler fixing bracket 20 is in contact. Will be done. That is, the manufacturing method of the sealed compressor 1 is an electrode placement step (step) in which the first electrode 110 is placed in contact with the contact portion 23 and the second electrode 120 is placed in contact with the suction muffler 3. It has S2). In FIG. 8, the first electrode 110 is arranged below the suction muffler 3 and the second electrode 120 is arranged above the suction muffler 3, but the first electrode 110 and the second electrode 120 with respect to the suction muffler 3 The position is not limited to this position. The contact portion 23 is arranged between the first electrode 110 and the outer peripheral wall 3d of the suction muffler 3, and the positions of the first electrode 110 and the second electrode 120 are arranged on opposite sides via the suction muffler 3. It suffices if it is done. Therefore, the positions of the first electrode 110 and the second electrode 120 may be arranged in the left-right direction or in the front-rear direction with respect to the suction muffler 3.

Next, the second electrode 120 pressurizes the suction muffler 3 in the direction of the base portion 21 of the suction muffler fixing bracket 20. When the second electrode 120 applies pressure to the suction muffler 3, the protrusion 25 or the protrusion 28 is pressed against the outer peripheral wall 3d of the suction muffler 3. That is, in the method of manufacturing the sealed compressor 1, the second electrode 120 in contact with the suction muffler 3 is moved, and pressure is applied to the suction muffler 3 to apply pressure to the protrusion 25 or the protrusion 28. It has a step (step S3). When the protrusion 25 or the protrusion 28 is pressed against the outer peripheral wall 3d of the suction muffler 3, the suction muffler 3 is restrained by the protrusion 25 or the protrusion 28 divided in the circumferential direction via the foundation portion 21. It is possible to avoid the misalignment of the muffler 3.

Next, in the manufacturing method of the sealed compressor 1 according to the present embodiment, the suction muffler 3 and the suction muffler fixing bracket 20 are welded and fixed by using projection welding. That is, in the method of manufacturing the sealed compressor 1, a current is passed through the protrusion 25 or the protrusion 28 together with the pressurizing step (step S3) to melt the protrusion 25 or the protrusion 28, and the suction muffler 3 is fixed for the suction muffler. It has a fixing step (step S4) of fixing to the metal fitting 20. Specifically, using the first electrode 110 and the second electrode 120, a current is passed through the protrusion 25 or the protrusion 28 via the outer peripheral wall 3d of the suction muffler 3 and the contact portion 23. By pressurizing the suction muffler 3 with the second electrode 120 and passing an electric current in a state where the outer peripheral wall 3d of the suction muffler 3 is in close contact with the protrusion 25 or the protrusion 28, the outer wall 3d and the protrusion 25 or the protrusion 28 are passed. Joule heat is generated by the electrical resistance of the contact surface between and. Due to the generated Joule heat, the suction muffler 3 and the protrusion 25 or the protrusion 28 are melted and melted, so that the outer peripheral wall 3d of the suction muffler 3 is restrained by the contact portion 23 of the suction muffler fixing bracket 20. Joined in form. In the closed compressor 1, the projection 25 or the protrusion 28 is brought into close contact with each other, and a pressure is applied to pass an electric current, so that the suction muffler 3 is constrained by the contact portion 23 of the suction muffler fixing bracket 20 for projection. A fixed structure is obtained by welding.

[Action effect]
The suction muffler fixing bracket 20 has a contact portion 23 fixed to the suction muffler 3, and the contact portion 23 is the first unit arranged on both sides of the foundation portion 21 fixed to the closed container 2. It has a contact portion 23a and a second contact portion 23b. The first contact portion 23a and the second contact portion 23b have a shape in which the third facing surface portion 23a1 and the fourth facing surface portion 23b1 facing the outer peripheral wall 3d of the suction muffler 3 are curved along the circumferential direction of the outer peripheral wall 3d, respectively. Is formed in. Then, at least one or more protruding

protrusions

25 or 28 used for projection welding with the outer peripheral wall 3d are formed on the third facing surface portion 23a1 and the fourth facing surface portion 23b1.

Therefore, the suction muffler 3 to which pressure is applied by the second electrode 120 at the time of projection welding between the suction muffler fixing bracket 20 and the suction muffler 3 is supported by the third facing surface portion 23a1 and the fourth facing surface portion 23b1 of the contact portion 23. Will be done. During projection welding, the suction muffler 3 is supported by the third facing surface portion 23a1 and the fourth facing surface portion 23b1 of the contact portion 23, so that the posture inclination of the suction muffler 3 is corrected and the suction muffler 3 is suppressed from slipping during projection welding. it can. Therefore, in the sealed compressor 1, slippage of the suction muffler 3 during projection welding is suppressed, and the reliability of the welding strength of projection welding can be improved.

In addition, when fixing the conventional sealed compressor and suction muffler by projection welding, there is a restriction that the fixing range of the suction muffler is narrow, and it may not be possible to suppress the noise caused by the breathing of the suction muffler during compressor operation. The suction muffler 3 after projection welding is restrained by the contact portion 23 of the suction muffler fixing bracket 20. Therefore, depending on the size of the contact portion 23, the suction muffler 3 can have a wider fixing range with the fixing bracket than the conventional suction muffler that generates noise, and the suction muffler 3 can be used during the operation of the sealed compressor 1. The noise associated with the breathing of 3 can be suppressed.

Further, the protrusion 25 or the protrusion 28 formed on the third facing surface portion 23a1 and the fourth facing surface portion 23b1 always comes into contact with a part of the outer peripheral wall 3d of the suction muffler 3 in the outer peripheral direction. Therefore, in the sealed compressor 1, the energization path at the time of projection welding is secured, and the suction muffler 3 is restrained by the contact portion 23 of the suction muffler fixing bracket 20 regardless of the outer diameter roundness of the suction muffler 3. Projection welding can be performed. As a result, the reliability of fixing the suction muffler 3 and the closed container 2 can be ensured.

Further, the suction muffler fixing bracket 20 does not need to use an auxiliary material for fixing the suction muffler 3, and together with the realization of inexpensive joining between the suction muffler 3 and the closed container 2, the material of the suction muffler 3 is thin. Can be welded. As a result, the reliability of fixing the suction muffler 3 and the closed container 2 can be ensured, and the manufacturing cost can be reduced.

Further, the protrusion 25 has a ridge portion 25r which is a series of vertices located at the tip portion in the protrusion direction, and the ridge portion 25r is viewed from the axial direction S of the suction muffler 3 formed in a cylindrical shape. , Is formed in a straight line. Therefore, the ridge line portion 25r always comes into contact with a part of the outer peripheral wall 3d of the suction muffler 3 in the outer peripheral direction. Therefore, in the sealed compressor 1, the energization path at the time of projection welding is secured, and the suction muffler 3 is restrained by the contact portion 23 of the suction muffler fixing bracket 20 regardless of the outer diameter roundness of the suction muffler 3. Projection welding can be performed. As a result, the reliability of fixing the suction muffler 3 and the closed container 2 can be ensured.

Further, the protrusion 28 has a ridge 28r which is a series of vertices located at the tip in the protrusion direction, and the ridge 28r is viewed from the axial direction S of the suction muffler 3 formed in a cylindrical shape. In addition, it is formed in a curved shape along the circumferential direction of the outer peripheral wall 3d. Therefore, the ridge line portion 28r is likely to come into contact with a part of the outer peripheral wall 3d of the suction muffler 3 in the outer peripheral direction in a wider range. Therefore, in the sealed compressor 1, the energization path at the time of projection welding is secured, and the suction muffler 3 is restrained by the contact portion 23 of the suction muffler fixing bracket 20 regardless of the outer diameter roundness of the suction muffler 3. Projection welding can be performed. As a result, the reliability of fixing the suction muffler 3 and the closed container 2 can be ensured.

Further, since the protrusion 25 or the protrusion 28 having the linearly formed ridge line portion 25r or the ridge line portion 28r comes into contact with a wide range of the outer peripheral wall 3d of the suction muffler 3, the protrusions are sunk by the pressure of projection welding. It is difficult and the pressurization during welding can be increased. Therefore, the sealed compressor 1 can suppress the thinning of the suction muffler 3 due to the scattering of welding spatter during projection welding. Then, in the projection welding in the closed compressor 1, the thinning of the suction muffler 3 due to the welding can be suppressed, so that the material strength is not lowered. Therefore, the closed type compressor 1 does not need to use an auxiliary material for fixing the suction muffler 3, and realizes inexpensive joining between the suction muffler 3 and the closed container 2 and to a place where the material of the suction muffler 3 is thin. Welding can be performed.

Further, it is formed in a protruding portion 25 having a ridge line portion 25r at a twisted position perpendicular to the axial direction S of the suction muffler 3, or a curved shape along the circumferential direction of the outer peripheral wall 3d of the suction muffler 3. It has a protrusion 28 having a vertical ridge 28r. Since the protrusion 25 or the protrusion 28 has a protrusion shape along the outer peripheral wall 3d of the suction muffler 3, it is easy to make contact with the outer peripheral wall 3d of the suction muffler 3 and secure an energization path. Therefore, the sealed compressor 1 provided with the suction muffler fixing bracket 20 can easily perform projection welding even in a welding posture in which the suction muffler 3 is tilted. Further, the sealed compressor 1 provided with the suction muffler fixing bracket 20 can easily perform projection welding even with the suction muffler 3 having a large outer diameter roundness. As a result, the reliability of fixing the suction muffler 3 and the closed container 2 can be ensured.

Further, the suction muffler fixing bracket 20 is formed of a single plate material in which the foundation portion 21, the contact portion 23, the extension portion 22, and the protrusion 25 or the protrusion 28 are pressed. Therefore, the suction muffler fixing bracket 20 can be manufactured by pressing a single plate material, which is easy to manufacture and can suppress the manufacturing cost. Further, by using the protrusion 25 or the protrusion 28, it is not necessary to use an auxiliary material for fixing the suction muffler 3, and it is possible to realize an inexpensive joining between the suction muffler 3 and the closed container 2.

The configuration shown in the above embodiment is an example, and can be combined with another known technique, or a part of the configuration may be omitted or changed without departing from the gist. It is possible.

1 Sealed compressor, 2 Sealed container, 2a Body part, 2a1 Outer wall, 2b Bottom, 2c Lid, 3 Suction muffler, 3a Upper container, 3b Lower container, 3c Inflow pipe, 3d Outer wall, 4 Inhalation pipe, 5 Suction hole, 6 fixing member, 6a connection pipe, 6b ring, 7 discharge pipe, 8 glass terminal, 10 motor part, 12 stator, 14 rotor, 16 lead wire, 17 shaft, 17a fixed surface, 18 eccentric part, 20 suction Fixing bracket for muffler, 20A Fixing bracket for suction muffler, 21 Foundation part, 21a 1st facing surface part, 21b 2nd facing surface part, 21d 1st end part, 21e 2nd end part, 22 extension part, 22a 1st extension Part, 22b 2nd extension part, 22d 3rd end part, 22e 4th end part, 23 contact part, 23a 1st contact part, 23a1 3rd facing surface part, 23b 2nd contact part, 23b1 4th facing part Face part, 23d tip part, 23e tip part, 24 protrusion part, 24a first protrusion part, 24b second protrusion part, 24c third protrusion part, 24d fourth protrusion part, 25 protrusion part, 25a upper first protrusion part, 25b Lower 1st protrusion, 25c Upper 2nd protrusion, 25d Lower 2nd protrusion, 25r ridge, 28 protrusion, 28r ridge, 30 compression mechanism, 31 cylinder, 32 vanes, 34 upper bearing, 35 lower bearing , 36 piston, 40 refrigerating machine oil, 110 first electrode, 120 second electrode.

Claims

It is a fixing bracket for fixing the suction muffler to the closed container of the closed compressor.
The base part fixed to the closed container and
The contact portion fixed to the suction muffler and
An extension portion connecting the foundation portion and the contact portion,
With
The contact portion is
It has a first contact portion and a second contact portion arranged on both sides of the foundation portion.
The first contact portion and the second contact portion are
The facing surfaces facing the outer peripheral wall of the suction muffler are formed in a curved shape along the circumferential direction of the outer peripheral wall.
A fixing bracket having at least one or more protruding protrusions used for projection welding with the outer peripheral wall formed on the facing surface portion.
The protrusion is
It has a ridgeline that is a series of vertices located at the tip in the protruding direction.
The fixing bracket according to claim 1, wherein the ridge line portion is formed in a straight line when viewed from the axial direction of the suction muffler formed in a cylindrical shape.
The protrusion is
It has a ridgeline that is a series of vertices located at the tip in the protruding direction.
The fixing bracket according to claim 1, wherein the ridge line portion is formed in a shape curved along the circumferential direction of the outer peripheral wall when viewed from the axial direction of the suction muffler formed in a cylindrical shape.
The fixing bracket according to claim 2 or 3, wherein the extending direction of the protrusion along the ridge is a twisted position perpendicular to the axial direction.
The fixing according to any one of claims 1 to 4, wherein the foundation portion, the contact portion, the extension portion, and the protrusion portion are formed of a single press-processed plate material. Metal fittings.
A sealed compressor provided with the fixing bracket according to any one of claims 1 to 5.
A suction muffler arranging step of arranging the suction muffler so as to come into contact with the protrusion of the fixing bracket according to any one of claims 1 to 5.
An electrode placement step in which the first electrode is placed in contact with the contact portion and the second electrode is placed in contact with the suction muffler.
A pressurizing step of moving the second electrode and applying pressure to the suction muffler to apply pressure to the protrusions.
A fixing step of applying an electric current to the protrusion together with the pressurizing step to melt the protrusion and fixing the suction muffler to the fixing bracket.
A method of manufacturing a closed compressor equipped with.