KR101708308B1 - Hermetic compressor and manufacturing method thereof - Google Patents

Abstract

According to an aspect of the present invention, there is provided a hermetic compressor and a method of manufacturing the hermetic compressor. The hermetic compressor includes first and second cases joined together along a circumferential contact surface to form a cylindrical shape; A stator fixed inside the first and second cases; A rotor rotatably installed on the stator; A compression mechanism coupled to the inside of the rotor and rotatably disposed together with the rotor; A fixed shaft having an eccentric portion for fixing the compression mechanism in the axial direction and having one side fixed to the first case and the other side fixed to the second case; An accumulator disposed to close the upper surface of the first case and having one end of the fixed shaft penetrated; An upper cap sealing the upper surface of the accumulator; And a lower cap sealing the lower surface of the second case.

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 cases each having a cylindrical shape joined to each other along a circumferential contact surface; A stator fixed inside the first and second cases; A rotor rotatably installed on the stator; A compression mechanism coupled to the inside of the rotor and rotatably disposed together with the rotor; A fixed shaft having an eccentric portion for fixing the compression mechanism in the axial direction and having one side fixed to the first case and the other side fixed to the second case; An accumulator disposed to close the upper surface of the first case and having one end of the fixed shaft penetrated; An upper cap sealing the upper surface of the accumulator; And a lower cap sealing the lower surface of the second case.

According to the above aspect of the present invention, both end portions of the fixed shaft are fixed to two structures instead of one structure, thereby simplifying the centering operation which was a problem in assembling the fixed shaft. That is, in the case of fixing the fixed shaft to one structure, one side of the fixed shaft must be centered and joined first, and then the other side must be joined again by centering. However, if the structure can not absorb the machining tolerance, . For example, when the fixed shaft is bent, it is impossible to center each of the two sides on one structure.

However, in the above aspect of the present invention, the object to which the fixed shaft is fixed, generally, the sealed container is divided into at least two portions, the centering is independently performed on both ends of the fixed shaft, The work can be easily performed.

Here, the first case may include an upper frame in contact with the inner surface of the stator; And an upper shell coupled to the upper frame. In addition, the second case may include a lower frame which is in contact with the inner surface of the stator and faces the upper frame; And a lower shell coupled to the lower frame. At this time, since the fixed shaft is coupled to the upper and lower frames, the length of the fixed shaft can be reduced, which is not only advantageous in weight reduction but also facilitates the centering operation.

In this case, a fixing groove is formed on both sides of a contact surface where the top ends of the upper frame and the lower frame are in contact with each other, and the stator is inserted into the fixing groove and fixed. By doing so, the stator can be more stably fixed, and if the welding operation is performed along the contact surface, the upper frame, the lower frame and the stator can be joined at the same time, thereby simplifying the assembling work.

Meanwhile, the distal end surface of the upper cap may be in contact with the distal end surface of the first case. The accumulator may have a cylindrical shape with an open top and a portion of the outer circumferential surface of the accumulator may be in contact with an inner circumferential surface of the upper cap and another portion of the accumulator may be in contact with an inner surface of the first case. Here, when the first case includes the upper frame, the outer peripheral surface of the accumulator may be in contact with the upper frame. Thus, even if the upper cap and the first case are poorly joined, the inner compressed gas can be prevented from leaking because the inner cap is in contact with the accumulator.

Here, the first case, the upper cap, and the accumulator are welded together along the contact surfaces of the first case and the upper cap, so that the assembling work can be further simplified.

Meanwhile, a bush portion formed to protrude downward may be formed on the bottom surface of the accumulator, and the bush portion may be inserted so that the fixed shaft passes through the bush portion.

A sealing fixture provided inside the bushing; And a seal fixed to the sealing fixture and in contact with an outer circumferential surface of the stationary shaft.

Further, an extension pipe may be additionally provided at an end of the fixed shaft penetrating into 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.

According to another aspect of the present invention, there is provided a method of manufacturing a semiconductor device, comprising: mounting a stator on an upper side of a second case; Providing a gap retaining means on the inner surface of the stator; Inserting a rotor assembly coupled to a stationary shaft inside the gap retaining aperture; Coupling the first case to the second case so that the stator is fixed between the second case and the first case; Fixing the lower cap to the bottom surface of the second case; Mounting an accumulator on the first case with the upper portion of the fixed shaft passing through the first case; And fixing the upper cap to the upper portion of the accumulator.

According to this aspect of the present invention, centering is performed only for the first and second cases at the time of centering the fixed shaft, and the remaining components are mounted in a state in which centering is completed, thereby facilitating manufacture.

The method may further include the step of preparing the second case by coupling the lower frame and the lower shell, and the step of preparing the first case by combining the upper frame and the upper shell.

The first case, the second case and the stator are simultaneously fixed by welding the contact surfaces between the first case and the second case so that the three structures can be coupled to each other by one welding.

In addition, the first case, the accumulator and the upper cap may be fixed at the same time by welding the contact surfaces between the first case and the upper cap.

In addition, a seal for sealing between the accumulator and the fixed shaft may be installed in the accumulator so that the fixed shaft passes through the accumulator.

According to another aspect of the present invention, there is provided a rotary compressor comprising: a fixed shaft for axially supporting a compression mechanism unit coupled to a rotor so as to be rotatable; A first assembly supporting one side of the fixed shaft; A second assembly for supporting the other side of the fixed shaft; And a stator fixed between the first and second assemblies, wherein the first and second assemblies are combined to form a hermetically sealed container.

Here, an accumulator may be installed inside the first assembly.

Further, the first assembly, the second assembly, and the stator may be simultaneously joined by welding.

According to aspects of the present invention having the above-described structure, since the fixed shaft is coupled to the first and second cases, respectively, the centering operation can be performed more easily, thereby simplifying the manufacturing process.

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 A 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 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, and an upper cap 120 is fixed to the upper side of the upper shell 110. The upper shell 110 and the upper cap 120 are disposed such that their end portions are opposed to each other, but a fixed end portion 153 formed at the edge of the frame 150 to be described later is interposed between the upper shell 110 and the upper cap 120 do.

An upper frame 141 and a lower frame 145 are disposed below the upper shell 110 and a lower shell 130 is disposed below the lower frame 145. Here, the lower shell 130 may include a cylindrical portion such as the upper shell 110 and a cap covering the cylindrical portion. In FIG. 1, the lower shell 130 and the upper shell 110 are integrally formed.

The upper cap, the upper shell, the upper and lower frames, and the lower shell are coupled and fixed to each other to form a closed container. 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 space 501 is defined by the upper cap 120 and the upper shell 110 and the frame 150 so that the refrigerant introduced from the suction pipe 102 installed in the upper cap 120 And then vaporizes the liquid refrigerant. At this time, a part of the upper end of the fixed shaft 300 is inserted and fixed to the bush 151 formed on the bottom surface of the frame 150. 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.

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 151 may be in direct contact with the stationary shaft 300, but a sealing bush 510 may be provided between the bush 151 and the stationary shaft 300 to prevent leakage of the refrigerant. A sealing member 551 is provided on the inner circumferential surface of the sealing bushing 510 to seal the space 501 of the accumulator 500.

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 fixedly coupled between the upper frame 141 and the lower frame 145.

2, the half seating grooves 142 and 146 are formed symmetrically with respect to the lower frame 145 and the lower frame 145 so that both sides of the stator 210 are inserted and supported on the lower frame 145 and the lower frame 145, respectively. The upper frame 141 and the lower frame 145 are welded together along contact surfaces that contact each other. Since the stator 210 covers the contact surfaces of the upper frame and the lower frame, they are fixed together by welding.

The upper frame 141 is formed with a communication hole 333 for guiding the refrigerant discharged from the compression unit 400 to the discharge pipe 103 inserted and fixed to the upper shell 110, 335 are formed with oil holes 337 so as to recover the oil.

The upper frame and the lower frame are coupled to each other to form an intermediate shell 140 and the drive motor 200 and the compression unit 400 described above are disposed in the intermediate shell 140. One side of the fixing shaft 300 is coupled to the upper frame 141 by a fixing pin 168 and the other side is fixed to the lower frame 145. Accordingly, since both ends of the fixed shaft 300 are fixed to the two structures, that is, the upper frame and the lower frame, the centering operation can be performed independently for the upper frame and the lower frame.

If the centering work is performed individually at the upper and lower ends of the fixed shaft, the contact surface between the upper frame and the lower frame may be displaced. However, such deviation may be absorbed in the welding process of the upper and lower frames. To this end, the outer circumferential surface of the contact surface of the upper and lower frames is processed into a tapered shape so that the offset outer circumferential surface can be naturally covered by the welding material.

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 hermetically sealed container, and a rotor 220 rotatably disposed inside 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 oil recovery hole 211 may be formed at the edge of the stator 210 so that the oil recovered in the inner space of the sealed container may pass through the stator 210 and collect in the lower shell 130. The oil recovery hole 211 of the stator 210 is communicated with the oil recovery hole 337 of the lower frame 140.

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.

As shown in the figure, the fixed shaft 300 includes a shaft 310 having a predetermined length in the axial direction and having both ends fixed to the intermediate shell 140, And an eccentric part 320 which is expanded in the compression space 401 of the cylinder 410 and accommodated in the compression space 401 of the cylinder 410 to vary the volume of the compression space 401. Here, the axis of the shaft 310 is formed so that the axis of the shaft 310 coincides with the center of rotation of the cylinder 410, the center of rotation of the rotor 220, or the radius of the stator 210, 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 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 oil accumulated 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 bushing 510, 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. As the cylinder 410 continues to rotate, the refrigerant sucked into the suction chamber moves to the discharge chamber by the roller vane 440 and is compressed and discharged to the inner space of the shell 110 through the discharge port 425 And the refrigerant discharged to the inner space of the closed container 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 shell 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. 8 to 12. FIG.

First, after the stator 210 is assembled to the lower frame 145, the gap holding tool 600 is inserted from the lower side. 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 145. At this time, since the interval between the stator and the rotor is maintained at an intended interval by the gap holder 600, the fixed shaft is directly coupled to the lower frame 145 without performing a separate centering operation. Thereafter, the upper frame 141 is coupled to the upper side of the fixed shaft 300. At this time, it is not necessary to perform a separate centering operation between the upper frame and the fixed shaft.

When the coupling of the upper frame is completed, the upper and lower frames are coupled to each other. As described above, the coupling is performed by welding along the contact surface where the upper frame and the lower frame are in contact with each other. Since the stator is coupled with the upper and lower frames in this process, the process for joining the stator can be omitted. In addition, since the upper and lower frames are fixed individually to the upper and lower ends of the fixed shaft, the contact surfaces may not be precisely coincident with each other in the case of machining tolerance or deformation. Even in this case, although a step may appear on the appearance, leakage does not occur between the upper and lower frames, so that a separate operation for matching the contact surfaces is unnecessary.

Further, even if the contact surfaces are shifted from each other, they can be obscured to a certain extent by the welding material, so that they can not be distinguished from each other.

However, it is also conceivable to perform the centering work between the upper frame and the fixed shaft after coupling the upper and lower frames first, and to couple the fixed shaft to the upper frame.

When the coupling of the upper and lower frames is completed, the lower shell 130 is coupled to the lower end of the lower frame 145 by welding or the like, as shown in FIG. 9, after the gap holder 600 is removed.

When the coupling of the lower shell 130 is completed, the upper shell 110 is coupled as shown in FIG. 10, and the frame 150 is coupled to the inside of the upper shell 110 (FIG. 11).

12, when the upper cap 130 is coupled to the upper shell 110, welding is performed along the contact surface between the upper cap and the upper shell, Allow the upper shell and frame to be joined simultaneously.

Claims (20)

First and second cases joined together along a circumferential contact surface to form a cylindrical shape;
A stator fixed inside the first and second cases;
A rotor rotatably installed on the stator;
A compression mechanism coupled to the inside of the rotor and rotatably disposed together with the rotor;
A fixed shaft having an eccentric portion for fixing the compression mechanism in the axial direction and having one side fixed to the first case and the other side fixed to the second case;
An accumulator disposed to close the upper surface of the first case and having one end of the fixed shaft penetrated;
An upper cap sealing the upper surface of the accumulator; And
And a lower cap sealing the lower surface of the second case,
The first case includes:
An upper frame in contact with the inner surface of the stator; And
And an upper shell coupled to the upper frame,
The second case includes:
A lower frame facing the inner surface of the stator and facing the upper frame; And
And a lower shell coupled to the lower frame. delete delete The method according to claim 1,
Wherein a fixing groove is formed on both sides of a contact surface where the top ends of the upper frame and the lower frame are in contact with each other, and the stator is inserted and fixed in the fixing groove. 5. The method of claim 4,
Wherein the upper frame, the lower frame, and the stator are welded together at the same time. The method according to claim 1,
And the front end surface of the upper cap is in contact with the front end surface of the first case. The method according to claim 6,
The accumulator having a cylindrical shape with an open top,
Wherein a part of an outer circumferential surface of the accumulator contacts an inner circumferential surface of the upper cap and another part of the accumulator abuts an inner surface of the first case. 8. The method of claim 7,
Wherein the first case, the upper cap, and the accumulator are welded together along the contact surfaces of the first case and the upper cap to couple the first case, the upper cap and the accumulator at the same time. The method according to claim 1,
Wherein a bottom surface of the accumulator is formed with a bush portion protruding downward and inserted into the bush portion so that the fixing shaft passes through the bush portion. 10. The method of claim 9,
A sealing fixture provided inside the bush portion; And
And a seal fixed to the sealing fixture and contacting the outer circumferential surface of the stationary shaft. The method according to claim 1,
And an extension pipe is additionally provided at an end of the fixed shaft penetrating into the accumulator. Mounting a stator on the upper side of the second case;
Providing a gap retaining means on the inner surface of the stator;
Inserting a rotor assembly coupled to a stationary shaft inside the gap retaining aperture;
Coupling the first case to the second case so that the stator is fixed between the second case and the first case;
Fixing the lower cap to the bottom surface of the second case;
Mounting an accumulator on the first case with the upper portion of the fixed shaft passing through the first case;
Securing an upper cap to an upper portion of the accumulator;
Combining the lower frame and the lower shell to prepare a second case; And
And combining the upper frame and the upper shell to prepare a first case. delete delete 13. The method of claim 12,
Wherein the first case, the second case, and the stator are fixed at the same time by welding a contact surface between the first case and the second case. 13. The method of claim 12,
Wherein the first case, the accumulator and the upper cap are fixed at the same time by welding the contact surfaces between the first case and the upper cap. 13. The method of claim 12,
Wherein a seal for sealing between the accumulator and the fixed shaft is inserted into the accumulator so that the fixed shaft passes through the accumulator. A fixed shaft for axially supporting the compression mechanism combined with the rotor so as to be rotatable;
A first assembly supporting one side of the fixed shaft;
A second assembly for supporting the other side of the fixed shaft;
A stator fixed between the first and second assemblies;
And an accumulator fixedly coupled to the fixed shaft and installed inside the first assembly,
Wherein the accumulator has a cylindrical shape with an open top and an outer peripheral surface in contact with an inner peripheral surface of the first assembly,
Wherein the first and second assemblies are combined to form a hermetically sealed container. delete 19. The method of claim 18,
Wherein the first assembly, the second assembly, and the stator are simultaneously coupled by welding.

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