KR101708307B1 - Hermetic compressor and manufacturing method thereof - Google Patents

Abstract

According to one aspect of the present invention, there is provided a hermetic compressor and a method of manufacturing the hermetic compressor. The hermetic compressor includes a first and a second shell having a cylindrical shape with one side opened and having an open end and a closed end joined to each other; A stator fixed to an inner circumferential surface of the first shell; A lower frame disposed below the stator and fixed to an inner peripheral surface of the first shell; A fixed shaft having one side fixed to the first shell and the other side fixed to the lower frame; A compression mechanism supported in the axial direction of the fixed shaft and rotatably mounted on the fixed shaft; A rotor coupled to the outside of the compression mechanism and facing the stator; A lower cap sealing the open end of the lower frame; And an accumulator supported on the fixed shaft and disposed in a space generated by the first and second shells.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a hermetic compressor,

The present invention relates to a hermetic compressor and a method of manufacturing the hermetic compressor, and more particularly, to a compressor having a motor and a compression unit in an internal space of a closed shell and a method of manufacturing the same.

Generally, a hermetic compressor is provided with a driving motor for generating a driving force in an internal space of a sealed shell, and a compression unit for being coupled to the driving motor to compress the refrigerant. The hermetic compressor may be divided into a reciprocating type, a scroll type, a rotary type, and an oscillating type depending on a method of compressing a refrigerant. The reciprocating type, the scroll type, and the rotary type are methods using the rotational force of the driving motor, and the oscillating type is a method using the reciprocating motion of the driving motor.

Among the hermetic compressors described above, the drive motor of the hermetic compressor utilizing the rotational force is provided with a crankshaft so that the rotational force of the drive motor is transmitted to the compression unit. For example, the driving motor of the rotary hermetic compressor (hereafter, a hermetic compressor) includes a stator fixed to the shell, a rotor inserted in the stator with a predetermined gap and rotated by interaction with the stator, And a crankshaft coupled to the crankshaft and rotating together to transmit the rotational force of the driving motor to the compression unit. The compression unit includes a cylinder defining a compression space, a vane separating a compression space of the cylinder into a suction chamber and a discharge chamber, and a plurality of bearing members supporting the vane and forming a compression space together with the cylinder consist of. The bearing member is disposed on one side of the driving motor or on both sides thereof, and is supported axially and radially so that the crankshaft can rotate relative to the cylinder.

An accumulator is installed at one side of the shell to separate the refrigerant, which is connected to the suction port of the cylinder and is sucked into the suction port, into a gas refrigerant and a liquid refrigerant so that only the gas refrigerant is sucked into the compression space.

The capacity of the accumulator is determined according to the capacity of the compressor or the capacity of the refrigeration system. The accumulator is fixed to the outside of the shell with a band or a clamp, and is connected to the inlet of the cylinder through an L- have.

However, in the case of the conventional hermetic compressor, the size of the compressor including the accumulator is increased as the accumulator is installed outside the shell, thereby increasing the size of the electric appliance employing the compressor.

In addition, in the conventional hermetic compressor, since the accumulator is connected to the suction pipe at the outer periphery of the shell, assembly of the shell and assembly of the accumulator are separated to increase the number of assemblies of the compressor, complicating the assembling process, There is a problem that the possibility of leakage of the refrigerant increases due to an increase in the number of connection portions.

In addition, in the conventional hermetic compressor, the area occupied by the compressor increases as the accumulator is installed outside the shell, thereby limiting the degree of freedom of design of the outdoor unit when the compressor is mounted to the outdoor unit of the refrigeration cycle apparatus There was also a problem.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a compressor that can be easily manufactured while including an accumulator.

Another object of the present invention is to provide a method of manufacturing a compressor that can easily manufacture a compressor including an accumulator.

According to an aspect of the present invention, there is provided an electronic device comprising: first and second shells having a cylindrical shape with one side opened and having an open end and a closed end joined to each other; A stator fixed to an inner circumferential surface of the first shell; A lower frame disposed below the stator and fixed to an inner peripheral surface of the first shell; A fixed shaft having one side fixed to the first shell and the other side fixed to the lower frame; A compression mechanism supported in the axial direction of the fixed shaft and rotatably mounted on the fixed shaft; A rotor coupled to the outside of the compression mechanism and facing the stator; A lower cap sealing the open end of the lower frame; And an accumulator supported on the fixed shaft and disposed in a space generated by the first and second shells.

In the above aspect of the present invention, the closed container of the compressor is constituted by a plurality of shells, and the fixed shaft is fixed to one of the shells, thereby facilitating the centering operation as compared with the case where the fixed shaft crosses the entire closed container .

Here, the accumulator may be coupled to the fixed shaft in a state where the outer peripheral surface of the accumulator is spaced apart from the inner peripheral surface of the second shell. In this case, since the accumulator is not engaged with the second shell, it does not affect the centering of the fixed shaft, thereby facilitating the centering operation.

At this time, a bush portion protruding to have a circular cross-section may be formed on the bottom surface of the accumulator, and the fixing shaft may be inserted and fixed in the bush portion. The fixed shaft may be directly coupled to the bushing, but may further include a fixed bushing having one side coupled to the closed end of the first shell, the other side inserted into the bush, and the fixed shaft inserted therein, And the fixed shaft may be indirectly coupled to the bush portion.

In this case, the fixed bush may include a flange coupled to the first shell; And a shaft portion that is positioned at a center portion of the flange portion and inserted into the bush portion through the first shell.

Here, the outer diameter of the bush portion is formed to be smaller than the inner diameter of the through-hole formed in the first shell, so that the machining tolerance can be absorbed.

A sealing fixture is mounted on the inner surface of the bush, and a seal in contact with the fixation shaft can be inserted and fixed to the inner surface of the sealing fixture.

Further, it may further include an extension pipe attached to the end of the fixed shaft and extending to the internal space of the accumulator. In this way, the length of the fixed shaft can be reduced by an amount corresponding to the extension pipe, thereby reducing the weight and reducing the machining error and deformation of the fixed shaft.

The inner diameter of the extension pipe may be larger than the inner diameter of the fixed shaft. The inner diameter of the extension pipe can be enlarged to reduce the flow resistance to the refrigerant flowing into the expansion pipe, and the weight increase can be minimized as compared with the case of expanding the inner diameter of the fixed shaft.

On the other hand, the bottom surface of the stator and the top end of the lower frame can be brought into contact with each other. As a result, the stator can be more stably supported by the upper end of the lower frame, and the position of the stator can be prevented from being displaced in the assembling process.

According to another aspect of the present invention, there is provided a method of manufacturing a stator, comprising the steps of: seating a stator at an upper end of a lower frame; Fixing one end of a fixed shaft to which the rotor assembly is coupled to the lower frame in a state where the stator and the rotor maintain a predetermined gap; Fixing the lower frame and the stator with the fixed shaft coupled to each other inside a cylindrical first shell having one side opened; Fixing the other end of the fixed shaft to the closed end of the first shell; Coupling a lower cap to an open end of the first shell; Coupling an accumulator to an outer circumferential surface of the fixed shaft; Coupling the first and second shells with the open end of the second shell facing the closed end of the first shell; And fixing a suction pipe communicating with the inside of the accumulator through the closed end of the second shell.

Here, in order to maintain a constant distance between the stator and the rotor, it is possible to further include a step of placing the stator in the lower frame and then inserting the gap retaining hole in the stator.

In addition, when the fixed shaft is indirectly mounted by the fixed bush, it may further include the step of installing the fixed bush at the closed end of the first shell before fixing the lower frame to the inside of the first shell.

In the step of fixing the lower frame and the stator to the first shell, the lower frame and the stator are simultaneously fitted and fixed in the first shell.

According to another aspect of the present invention, there is provided an air conditioner comprising: a hermetically sealed container having a stator fixedly mounted on an inner circumferential surface thereof; A fixed shaft which axially supports the compression mechanism provided inside the rotor so as to be rotatable; An upper support member and a lower support member for supporting the fixed shaft in the hermetically sealed container; And an accumulator fixed to the fixed shaft at an upper side of the upper support member and having a space blocked from the inner space of the sealed container, wherein an outer peripheral surface of the accumulator is spaced apart from the inner surface of the closed container, Is provided.

In the above aspect of the present invention, since the accumulator is fixed to the fixed shaft and is spaced apart from the inner space of the hermetically sealed container, the accumulator does not affect the position of the fixed shaft during the centering operation of the fixed shaft relative to the hermetically sealed container. .

Here, the upper support member and the lower support member may have a disc shape that divides the inside of the closed container.

The closed container may be configured such that at least two members are coupled to each other to form a closed inner space.

In this case, the fixing shaft is inserted into the accumulator, and the inner space of the accumulator is blocked from the inner space of the sealed container when the fixing shaft is inserted.

According to aspects of the present invention having the above-described structure, the centering operation can be facilitated in the process of installing the fixing shaft in the closed container, which is advantageous in that the manufacturing can be facilitated.

1 is a sectional view showing an internal structure of a hermetic compressor according to an embodiment of the present invention,
2 is an enlarged cross-sectional view of a portion B in Fig. 1,
3 is a cross-sectional view showing a coupling relation between the fixed shaft and the compression unit in the hermetic compressor of FIG. 1,
FIG. 4 is a plan view showing the eccentric portion of the fixed shaft in the hermetic compressor of FIG. 1,
Fig. 5 is a sectional view showing the compression unit in the hermetic compressor according to Fig. 1,
Fig. 6 is a sectional view taken along line II-II in Fig. 5,
FIG. 7 is a sectional view showing another embodiment of a coupling structure of a cylinder and a rotor in the hermetic compressor of FIG. 1;
8 is a cross-sectional view showing an internal structure of another embodiment of the hermetic compressor according to the present invention,
9 to 12 are explanatory diagrams showing a process of manufacturing the embodiment.

Hereinafter, embodiments of the hermetic compressor according to the present invention will be described in detail with reference to the accompanying drawings.

1 to 3 show an embodiment of a hermetic compressor according to the present invention. 1 to 3, the embodiment 100 includes a cylindrical upper shell 110 having a closed side, and a lower portion of the upper shell 110, which is also closed at one side, A shell 120 is disposed. As shown, the closed end of the lower shell 120 is coupled to the open end of the upper shell 110. The closed end of the lower shell 120 is formed to have a diameter smaller than that of the remaining portion so that the outer circumferential surfaces of the upper shell and the lower shell can be substantially straight when the upper shell 110 is engaged.

In the above description, the term closed end is used to distinguish the open end from the fully open end, and as shown, the closed end of the upper shell 110 or the lower shell 120 is not actually completely closed, And a plurality of holes through which a refrigerant can be inserted are formed.

On the other hand, the lower cap 130 is coupled to the inner circumferential surface of the lower shell 120 at the open end of the lower shell 120. Therefore, in the above embodiment, one closed vessel is formed by the upper shell 110, the lower shell 120, and the lower cap 130. A driving motor 200 for generating a rotational force is provided in the inner space of the closed container and a fixed shaft 300 fixed to the inner space of the closed container is installed at the center of the driving motor 200, A cylinder 410 coupled to the rotator 220 of the driving motor 200 is rotatably coupled to the rotary shaft 300 and a predetermined space (not shown) an accumulator 500 having an accumulation chamber 501 is coupled to the fixed shaft 300.

The upper housing 510 and the lower housing 520 are coupled to each other to form a structure. The upper and lower housings are spaced apart from the inner surface of the upper shell 110. The lower housing 520 is coupled to a fixed shaft to be described later and installed with a suction pipe 102 through the upper housing 510 and the upper surface of the upper shell 110. Accordingly, the introduced refrigerant flows into the space 501 while being blocked from the inner space of the hermetically sealed container. The space 501 is defined by the upper and lower housings, where the refrigerant to be compressed temporarily remains.

In addition, the refrigerant collects and vaporizes the liquid refrigerant contained in the refrigerant flowing from the suction pipe 102. At this time, a part of the upper end of the fixed shaft 300 is inserted and fixed to the bush portion 522 formed on the bottom surface of the lower housing 520. An extension pipe (330) is mounted on the upper portion of the fixed shaft (300) to prevent the collected liquid refrigerant from flowing into the fixed shaft.

A terminal 104 is mounted on a sidewall of the upper shell 110 so that the terminal mounting portion 524 is recessed in a lower half portion of one side of the lower housing 520, . The terminal 104 may be installed on the upper surface of the upper shell 110 as shown in FIG. In this case, it is not necessary to form a separate terminal mounting portion on the sidewall of the accumulator 500. It is preferable that the sealing bush 530, which will be described later, is disposed so as to be accommodated in the interior space 501 of the accumulator 500, 104 can prevent the height of the compressor from being increased.

The length of the fixed shaft may be extended to perform the same function. However, the extension pipe 330 is advantageous in terms of weight and cost reduction. In addition, since the bending stiffness decreases as the length of the fixed shaft becomes longer, it is advantageous to shorten the fixed shaft as much as possible.

The bush 522 may be in direct contact with the stationary shaft 300, but a sealing bush 530 is provided between the bush 522 and the stationary shaft 300 to prevent leakage of the refrigerant. A sealing member 532 is provided on an inner circumferential surface of the sealing bush 530 to seal the sealing space 501 of the accumulator 500. The sealing member may be an O-ring or the like.

A drive motor 200 for generating a rotational force is installed in the inner space of the hermetically sealed container. The drive motor 200 is disposed inside the hermetically sealed container with the fixed shaft 300 as a center. Specifically, the fixed shaft 300 is rotatably coupled with a rotating cylinder 410 coupled to the rotor 220 of the driving motor 200, and is disposed so as to face the rotor 220, The stator 210 is fixed to the inner wall of the lower shell 120. [

A communication hole 122 for guiding the refrigerant discharged from the compression unit 400 to the discharge tube 103 inserted and fixed to the upper shell 110 is formed on the upper surface of the lower shell 120, An oil hole 142 is formed in the lower frame 140 installed to cross the inner surface of the lower shell 120 to recover oil.

The lower frame is coupled to the lower shell 120 to support both ends of the fixed shaft, and the driving motor 200 and the compression unit 400 described above are disposed therein. One side of the fixing shaft 300 is indirectly coupled to the upper side of the lower shell through the fixing bush 160 and the other side is coupled and fixed to the lower frame 140. 2, a bush hole 113 is formed at an upper end of the lower shell 120 so that a bearing water portion 161 of the fixed bushing 160 into which the fixed shaft 300 is inserted is passed therethrough And a through hole 114 for fastening the fixed bushing 160 with the bolts 115 is formed around the bush hole 113. [ A fastening hole 166 is formed in the flange portion 165 of the fixed bushing 160 so as to correspond to the through hole 114.

The inner diameter of the bush hole 113 is formed to be larger than the outer diameter of the shaft receiving portion 161 and the diameter of the through hole 114 is larger than the diameter of the fastening hole 166, It is easy to assemble them in accordance with the concentricity.

The stator 210 of the driving motor 200 is fixed to the lower shell 120 by heat shrinking. The lower end of the stator 210 supports the stator 210 and the lower end of the stator 210 The lower frame 140 supporting the lower shell 140 is fixed to the lower shell 120 by shrinkage. Therefore, the centering operation becomes easier since the two points where the fixed shaft 300 is engaged are relatively short compared to the entire length of the sealed container.

Now, the compression unit 400 and the drive motor 200 will be described. As described above, the driving motor 200 includes a stator 210 fixed to the main enclosure 100 and a rotor 220 rotatably disposed in the stator 210.

In the stator 210, a plurality of annularly formed stator sheets are stacked by a predetermined height, and coils 212 are wound around the teeth provided on the inner circumferential surface thereof. The stator 210 is integrally fixed to the shell 110 and is integrally fixed to the bottom surface of the stator 210. The distal end surface of the lower frame 140 is closely fixed to the bottom surface of the stator 210.

The rotor 220 is disposed on the inner circumferential surface of the stator 210 with a predetermined gap therebetween, and the cylinder 410 is integrally coupled to the center of the rotor 220. The rotor 220 and the cylinder 410 are coupled together by a bolt together with an upper bearing plate 420 (hereinafter abbreviated as an upper bearing) or a lower bearing plate 430 Or the rotor 220 and the cylinder 410 may be integrally formed using a method such as sintering.

The fixed shaft 300 includes a shaft 310 having a predetermined length in the axial direction and having both ends fixed to the lower shell 120 and the lower frame 140, And an eccentric part 320 which eccentrically extends in the radial direction from the center and is accommodated in the compression space 401 of the cylinder 410 to vary the volume of the compression space 401. The shaft 310 is formed such that its axial center is aligned with the center of rotation of the cylinder 410 or the center of rotation of the rotor 220 or the radius of the stator 210 or the radius of the closed container 100 The center of the eccentric portion 320 is formed to be eccentric with the center of rotation of the cylinder 410 or the center of rotation of the rotor 220 or the center of radius of the stator 210 or the radius of the closed container.

The upper end of the shaft portion 310 is inserted into the annular space 501 of the accumulator 500 while the lower end of the shaft portion 310 is inserted into the accumulator 500 to radially support the upper bearing 420 and the lower bearing 430 And is rotatably coupled through the upper bearing 420 and the lower bearing 430 in the axial direction.

The upper end of the shaft 310 communicates with the space 501 of the accumulator 500 so that the first suction guide hole 311 constituting the refrigerant suction passage 301 is axially extended to a predetermined depth, The eccentric portion 320 has one end communicated with the first suction guide hole 311 and the other end communicated with the compression space 401 so that the first suction guide hole 311 is communicated with the first suction guide hole 311, A second suction guide hole 321 constituting a refrigerant suction passage 301 is formed in the radial direction together with the second suction guide hole 311. [

A drain hole 313 for collecting the oil in the accumulator 500 into the compression space 401 is provided at a position corresponding to the upper side of the shaft portion 310, exactly to the surface of the sealing bush 530, And may be formed to communicate with the first suction guide hole 311.

4, the eccentric portion 320 is formed in a disk shape having a predetermined thickness, and is formed eccentrically in the radial direction with respect to the axial center of the shaft portion 310. As the fixing shaft 310 is fixedly coupled to the hermetically sealed container, the eccentricity of the eccentric portion 320 may be formed to be sufficiently large according to the capacity of the compressor.

In the eccentric part 320, a second suction guide hole 321, which forms a refrigerant suction passage 301 together with the first suction guide hole 311, is formed in a radial direction. As shown in the drawing, the second suction guide hole 321 may be formed as a plurality of holes passing through the first suction guide hole 321 in a straight line. In some cases, the second suction guide hole 321 may be formed to pass through the first suction guide hole 311 only in one direction have.

The refrigerant guided in the radial direction through the second suction guide hole 321 is connected to the outer peripheral surface of the eccentric part 320 so that the refrigerant is always communicated with the suction port 443 of the roller vane 440, 322 may be formed in an annular shape. The suction guide groove 322 may be formed on the inner peripheral surface of the roller vane 440 or may be formed on the inner peripheral surface of the roller vane 440 and the outer peripheral surface of the eccentric portion 320 . The suction guide groove 322 is not necessarily formed in an annular shape but may be formed in a circular arc shape in the circumferential direction.

The compression unit 400 is coupled to the eccentric part 320 of the fixed shaft 300 so as to be coupled with the rotor 220 and rotate together to compress the refrigerant. 5 and 6, the compression unit 400 includes a cylinder 410, an upper bearing 420 coupled to both sides of the cylinder 410 to form a compression space 401, And a roller vane 440 provided between the cylinder 410 and the eccentric part 320 and compressing the refrigerant while varying the compression space 401.

The cylinder 410 is formed in an annular shape such that a compression space 401 is formed therein and the rotation center of the cylinder 410 is set to coincide with the axial center of the fixed shaft 300. A vane slot 411 is formed at one side of the cylinder 410 to insert the roller vane 440 in a radial direction while rotating the roller vane 440. The vane slot may be formed variously according to the shape of the roller vane. 6, the roller portion 441 and the vane portion 442 of the roller vane 440, which will be described later, are integrally formed, and the vane portion 442 is rotated in the vane slot 411, The rotary bush 415 may be provided in the vane slot 411 so that the roller portion 441 and the vane portion 442 are rotatably engaged Can be considered. In this case, the vane slot 411 may be formed in a sliding groove shape so that the vane portion 442 can slide in the vane slot 411.

The outer circumferential surface of the cylinder 410 is inserted into the rotor 220 and is integrally coupled. The cylinder 410 may be press-fitted into the rotor 220 or may be fastened to the upper bearing 420 or the lower bearing 430 with fastening bolts 402 and 403. FIG.

Here, when the cylinder 410 and the rotor 220 are coupled by the lower bearing 430, the outer diameter of the lower bearing 430 is larger than the outer diameter of the cylinder 410, 420 may be formed to be approximately equal to the outer diameter of the cylinder 410. The lower bearing 430 is formed with a first through hole 437 for fastening the cylinder 410 and a second through hole 438 for fastening the rotor 220. The first through holes 437 and the second through holes 438 may be radially different from each other in order to increase the fastening force, but they may be formed on the same line in consideration of the assemblability. A fastening bolt 402 which passes through the lower bearing 430 and is fastened to one side of the cylinder 410 and a fastening bolt 402 which is fastened to the other side of the cylinder 410 through the upper bearing 420 403 may be formed to be equal to each other.

Meanwhile, the cylinder 410 may be integrally formed with the rotor 220 as shown in FIG. For example, the cylinder 410 and the rotor 220 may be integrally formed through a process such as powder metallurgy or die casting. In this case, the cylinder 410 and the rotor 220 may be formed of the same material or different materials. When the cylinder 410 and the rotor 220 are made of different materials, the cylinder 410 is formed of a material having a relatively higher abrasion resistance than the rotor 220 in consideration of wear resistance of the cylinder 410 . 7, when the cylinder 410 and the rotor 220 are integrally formed, the upper bearing 420 and the lower bearing 430 may be formed to be equal to or smaller than the outer diameter of the cylinder 410 have.

6, protrusions 412 and grooves 221 are formed on the outer circumferential surface of the cylinder 410 and the inner circumferential surface of the rotor 220 so as to increase the coupling force between the cylinder 410 and the rotor 220, (A projection in the cylinder and a groove in the rotor in the figure). The vane slot 411 may be formed in a circumferential angle range where the protrusion 412 of the cylinder 410 is formed. A plurality of protrusions 412 and grooves 221 may be formed. When a plurality of the protruding portions 412 and the groove portions 221 are formed, it is preferable that the protruding portions 412 and the groove portions 221 are formed at regular intervals along the circumferential direction because the magnetic flux imbalance can be eliminated.

The upper bearing 420 is formed at the center of the upper surface of the fixing plate portion 421 with a bearing portion 422 protruding upward by a predetermined height to support the shaft portion 310 of the fixing shaft 300 in a radial direction. Here, the rotating body composed of the rotor 220, the cylinder 410, the upper bearing 420 and the lower bearing 430 to be described later has a rotation center coinciding with the axial center of the fixed shaft 300 The rotating body can be smoothly supported even if the length of the bearing portion 422 of the upper bearing 420 or the bearing portion 432 of the lower bearing 430 to be described later is not long.

The fixed plate portion 421 is formed in a circular plate shape and is fixed to the upper surface of the cylinder 410. The axis of the bearing portion 422 is formed through a shaft hole 423 in the axial direction, And is rotatably coupled. An oil groove, which will be described later, is formed in a spiral shape on the inner circumferential surface of the axial water hole 423.

A discharge port 425 is formed at one side of the bearing portion 422 to communicate with the compression space 401 and a discharge valve 426 is provided at an outlet end of the discharge port 425. A muffler 450 for attenuating the discharge noise of the refrigerant discharged through the discharge port 425 may be coupled to the upper side of the may bearing 420.

The hermetic compressor according to the present invention operates as follows.

That is, when power is applied to the stator 210 of the driving motor 200 and the rotor 220 rotates, a cylinder (not shown) coupled to the rotor 220 through the upper bearing 420 or the lower bearing 430 (410) rotates with respect to the fixed shaft (300). The roller vane 440 slidably coupled to the cylinder 410 separates the compression space 401 of the cylinder 410 into the suction chamber and the discharge chamber, thereby generating a suction force.

The refrigerant is sucked into the space 501 of the accumulator 500 via the suction pipe 102 and separated into a gas refrigerant and a liquid refrigerant in the space 501 of the accumulator 500, The compression space 401 (see FIG. 1) is connected to the fixed shaft 300 through the first suction guide hole 311, the second suction guide hole 321, the suction guide groove 322 and the suction port 443 of the roller vane 440. As shown in FIG. The refrigerant sucked into the suction chamber is compressed while moving to the discharge chamber by the roller vane 440 as the cylinder 410 continues to rotate and is discharged to the inner space 101 of the shell 110 through the discharge port 425, And the refrigerant discharged into the internal space 101 of the closed container 100 is discharged through the discharge pipe 103 to the refrigeration cycle apparatus. At this time, the lower bearing 430 rotates together with the rotor 220 at high speed, and the oil feeder 460 provided at the lower end of the lower bearing 430 pumps the oil of the lower cap 130 The oil groove 434 of the lower bearing 430, the lower oil pocket 323, the oil passage hole 325, the upper oil pocket 324 and the oil groove of the upper bearing 420 are sequentially passed through the respective sliding surfaces .

Now, the assembling process of the above embodiment will be described with reference to Figs. 9 to 12. Fig.

First, the stator 210 is mounted on the upper surface of the lower frame 140, and the gap holder 600 is inserted into the stator. The gap liner 604 has a gap holding liner 600 having a plurality of gap liner 604 on the upper surface of a disk-shaped base 602. The thickness of the gap liner 604 is determined by the stator 210, Corresponds to a gap that should be maintained by the controller 220. Accordingly, the gap liner 604 inserted through the oil recovery hole 337 allows the rotor to maintain an accurate gap with respect to the stator during the installation of the rotor.

Thereafter, the fixed shaft 300 having the rotor 220 and the compression unit 400 is coupled to the lower frame 140. At this time, since the interval between the stator and the rotor maintains an intended gap by the gap holding tool 600, the fixed shaft can be directly coupled to the lower frame 140 without performing any centering work. Thereafter, the fixed bush 160 is installed on the upper portion of the fixed shaft 300, and then the stator and the lower frame 140 are coupled together to the lower shell 120 by a heat shrinking method. As a result, the assembling work can be simplified and the position of the stator can be prevented from being displaced in the heat shrinking process because the stator is supported by the lower frame.

When the hot stamping operation is completed, the two bolts 115 and 116 are fastened to couple the upper side of the fixed shaft to the lower shell, and then the gap holding hole is removed.

Next, as shown in FIGS. 10 to 12, the lower cap 130, the accumulator 500, and the upper shell 110 are sequentially combined. Here, the lower cap 130 and the upper shell 110 may be coupled by performing a welding operation along the circumferential direction. In the case of the suction pipe and the discharge pipe, the upper shell or the upper housing can be fixed by silver welding.

Claims (16)

First and second shells having an open cylindrical shape and having an open end and a closed end joined to each other;
A stator fixed to an inner circumferential surface of the first shell;
A lower frame disposed below the stator and fixed to an inner peripheral surface of the first shell;
A fixed shaft having one side fixed to the first shell and the other side fixed to the lower frame;
A compression mechanism supported in the axial direction of the fixed shaft and rotatably mounted on the fixed shaft;
A rotor coupled to the outside of the compression mechanism and facing the stator;
A lower cap sealing the open end of the lower frame; And
And an accumulator supported on the fixed shaft and disposed in a space generated by the first and second shells,
Wherein the accumulator is coupled to the fixed shaft in a state where the outer peripheral surface of the accumulator is spaced apart from the inner peripheral surface of the second shell. delete The method according to claim 1,
And a bush portion protruding to have a circular cross section is formed on the bottom surface of the accumulator. The method of claim 3,
Further comprising a fixed bushing having one side coupled to the closed end of the first shell and the other side inserted into the bushing, the fixed shaft inserted into the interior of the bush. 5. The method of claim 4,
Wherein the fixed bush has a flange coupled to the first shell; And
And a shaft support portion positioned at a center portion of the flange portion and inserted through the first shell into the bush portion. 6. The method of claim 5,
And the outer diameter of the bush portion is smaller than the inner diameter of the through-hole formed in the first shell. The method of claim 3,
Wherein a sealing fixture is mounted on the inner surface of the bush, and a seal in contact with the fixed shaft is inserted and fixed to the inner surface of the sealing fixture. The method according to claim 1,
Further comprising an extension pipe attached to an end of the fixed shaft and extending into the internal space of the accumulator. 9. The method of claim 8,
Wherein an inner diameter of the extension pipe is larger than an inner diameter of the fixed shaft. The method according to claim 1,
Wherein a bottom surface of the stator and an upper end of the lower frame are in contact with each other. Placing the stator at the upper end of the lower frame;
Fixing one end of a fixed shaft to which the rotor assembly is coupled to the lower frame in a state where the stator and the rotor maintain a predetermined gap;
Fixing the lower frame and the stator with the fixed shaft coupled to each other inside a cylindrical first shell having one side opened;
Fixing the other end of the fixed shaft to the closed end of the first shell;
Coupling a lower cap to an open end of the first shell;
Coupling an accumulator to an outer circumferential surface of the fixed shaft;
Coupling the first and second shells with the open end of the second shell facing the closed end of the first shell; And
And fixing a suction pipe communicating with the inside of the accumulator through the closed end of the second shell. 12. The method of claim 11,
In the step of fixing the lower frame and the stator to the first shell,
Wherein the lower frame and the stator are simultaneously fitted and fixed in the first shell. A sealed container in which a stator is fixedly installed on an inner peripheral surface;
A fixed shaft for axially supporting the compression mechanism combined with the rotor so as to be rotatable;
An upper support member and a lower support member for supporting the fixed shaft in the hermetically sealed container; And
And an accumulator fixed to the fixed shaft at an upper side than the upper supporting member,
An outer peripheral surface of the accumulator is disposed apart from an inner surface of the sealed container,
Wherein the at least two members are coupled to each other to form a closed inner space. 14. The method of claim 13,
Wherein the upper support member and the lower support member have a disk shape that divides the inside of the hermetically sealed container. delete 14. The method of claim 13,
Wherein the fixed shaft is inserted into the accumulator and the inner space of the accumulator is blocked from the inner space of the sealed container when the fixed shaft is inserted.

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