JPH094574A - Scroll compressor - Google Patents

Abstract

PURPOSE: To provide an inexpensive scroll compressor which dispenses with the reversing work in assembling the compressor, whose assembling time is reduced. CONSTITUTION: In assembling a scroll compressor, a stator 12 of a motor is first fixed integratedly to a second frame 4 by bolts 21, etc. Then, the second frame 4 to which the stator 12 is integratedly fixed is inserted from a lower opening in a center shell 8 and fixed to the inner surface of the center shell 8. A main spindle 5 to which a rotor 13 is fixed is inserted in an upper opening in the center shell 8 and supported by the second frame 4. In addition, a first frame 3 is inserted in the upper opening, and fixed to the inner surface of the center shell 8 with the prescribed concentricity with the second frame 4. The reversing work during the assembly can be dispensed with to facilitate the assembly of the scroll compressor.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a scroll compressor used in, for example, refrigerators and air conditioners.

[0002]

2. Description of the Related Art Conventionally, as a scroll compressor of this type, as shown in FIG.
The one disclosed in the publication is cited. In FIG.
A fixed scroll 1 has a plate-like spiral tooth 1a at the bottom thereof.
Forming the first frame 3 by bolting, for example.
Has been concluded. Reference numeral 2 is an orbiting scroll, which has a plate-like spiral tooth 2a having the same shape as the plate-like spiral tooth 1a of the fixed scroll 1 at the upper portion thereof and a hollow boss portion 2b at the lower portion thereof. The inner surface is a rocking bearing 2
c.

Further, the thrust surface 2d of the orbiting scroll 2
Are slidably supported by the thrust surface 3b of the first frame 3 in the axial direction. Reference numeral 6 is an Oldham coupling, a claw A6a formed below is fitted in a guide groove 3c formed in the first frame 3 so as to be capable of reciprocating movement, and a claw B6b formed above is formed in the orbiting scroll 2. It is reciprocally fitted in a guide groove 2e formed in the thrust surface 2d. 5
Is a main shaft, a pin portion 5a is provided at the upper end thereof, and the first cylindrical surface 5b and the second cylindrical surface 5c are the first main bearing 3a and the second frame 4 of the first frame 3, respectively.
Is rotatably supported in the radial direction by the second main bearing 4a. Reference numeral 7 is a slider, and its hollow portion 7
A is reciprocally fitted to the pin portion 5a of the main shaft 5, and its outer peripheral cylindrical surface 7b is rotatably fitted to the rocking bearing 2c of the rocking scroll 2. 15 is a suction pipe, 16 is a discharge pipe, and 20 is an oil sump. Reference numeral 80 denotes a closed container, which is composed of a center shell 8 (container body), an upper shell 8a on the upper side, and a lower shell 8b on the lower side. An oil sump 20 is formed in the lower shell 8b. Further, 12 is a stator arranged in the center shell 8 between the first frame 3 and the second frame 4, 13 is a rotor fixed to the main shaft 5 to constitute an electric motor together with the stator 12, and 17 is a main shaft above the rotor 13. 5
Mounted on the rotor 13, a second balancer mounted below the rotor 13, and a plate-shaped spiral tooth 2a of the orbiting scroll 2 and a plate-shaped spiral tooth 1 of the fixed scroll 1.
and a is a crescent-shaped compression chamber in plan view formed by being combined with each other.

FIG. 10 is an explanatory view of a method of assembling the first frame 3 and the second frame 4 in the conventional scroll compressor. As shown in the figure, the first frame 3 and the stator 12 are shrink-fitted to the center shell 8, and the first frame 3 is axially positioned at the step portion of the center shell 8 and is generated by the compression operation. Even if the compressive load acts in the downward direction, the first frame 3 is not displaced in the downward direction. In addition, the first balancer 17 and the rotor 13
Is fixed to the main shaft 5 by shrink fitting or press fitting. The main shaft 5 is fitted in the first main bearing 3 a and the second main bearing 4 a, and is arranged between the first frame 3 and the second frame 4. The first frame 3 is chucked by the jig A9 on the reference cylindrical surface A3d. This means that the center shell 8 and the stator 12 that are integral with the first frame 3 are also supported by the jig A9. Separately from this, the second frame 4 has a reference cylindrical surface B4b and a jig B.
Chucked by 10.

Now, a method of assembling the first frame 3, the second frame 4, the main shaft 5 and the stator 12 will be described. First, the stator 12 is fixed to the center shell 8 by press fitting or shrink fitting. Next, the first frame 3
Is fixed from above the center shell 8 by press fitting or shrink fitting. Here, the center shell 8 is inverted, and the main shaft 5 in which the first balancer and the rotor 13 are shrink-fitted or press-fitted is inserted.

Furthermore, the second shell 4 having the second bearing 4a is press-fitted or shrink-fitted to form the center shell 8
Stick to Next, the center shell 8 is inverted again to assemble the slider 7, the Oldham coupling 6, the orbiting scroll 2, the fixed scroll 1, and the like above the first frame 3.

Next, the operation will be described. In FIG. 9, the main shaft 5 is driven by an electric motor, and the slider 7 revolves in synchronization with the rotation of the main shaft 5. The orbiting scroll 2 is driven by the orbital movement of the slider 7, but at that time, since the orbiting scroll 2 is restrained from rotating by the Oldham's joint 6, the orbiting scroll 2 does not orbitally orbital. By the oscillating movement of the orbiting scroll 2, the volume of the compression chamber 19 formed by the combination of the orbiting scroll 2 and the fixed scroll 1 is reduced, and the compression operation is realized. The compressed gas load at this time is the orbiting scroll 2.
, Which acts on the plate-shaped spiral teeth 2a of the rocking bearing 2
It is transmitted to the slider 7 via c. Then, the load is transmitted to the pin portion 5a of the main shaft 5. And this pin part 5
The first main bearing 3a of the first frame 3 and the second main bearing 4a of the second frame 4 so as to balance with the load acting on a.
Bearing load is generated in the bearing.

The above is the description of the compression operation and the bearing load generation. Next, the coaxial assembly will be described with reference to FIG. 10 again. The first main bearing 3a of the first frame 3 and the reference cylindrical surface A3d are machined to achieve high-precision coaxiality, and similarly, the second main bearing 4a of the second frame 4 and the reference cylindrical surface B4b are provided. Also achieves high-precision coaxiality. Then, the jig A chucking the reference cylindrical surface A3d
9 and jig B1 chucking the reference cylindrical surface B4b
0 means that the coaxial assembling apparatus guarantees high-precision coaxiality, and as a result, the first main bearing 3a of the first frame 3 and the second main bearing 4a of the second frame 4 have high precision. It means that the coaxiality is guaranteed. In this state, that is, in the state shown in FIG. 10, the arc spot welder 11 is used to join and weld the center shell 8 and the second frame 4 at three points. Then, even if the integrated first frame 3 and second frame 4 are removed from the jig of the coaxial assembling apparatus after welding is completed, the coaxiality between the first main bearing 3a and the second main bearing 4a is guaranteed. That is, the coaxial assembly is completed.

[0009]

Since the conventional scroll compressor is constructed as described above, it has to be turned upside down twice when the compressor is assembled. Therefore, not only a dedicated reversing device is required, but also time is required for reversing.

Further, in the conventional scroll compressor, the diameter of the center shell is increased to increase the required oil amount in some models or to increase the diameter of the stator in order to increase the efficiency of the motor. However, in this case, both the first frame and the second frame must be made larger according to the diameter of the center shell, and the types of both the first frame and the second frame are increased due to some models. The number of setup changes was increased and the processing cost was increased.

Further, in the conventional scroll compressor, the first main bearing and the second main bearing for the models of the same series having a small capacity but a large capacity are used, and
Since the diameter of the bearing part of the main shaft was designed for models with large capacity, the diameter was larger than necessary, and the cost was high for the capacity.

Further, in the conventional scroll compressor, the first
The frame is fixed to the center shell by shrink fitting or press fitting, but there is no means for restricting the positional displacement on the upper side in the axial direction. Therefore, for example, after the inside of the compressor is evacuated, when the refrigerant gas is filled from the suction pipe side, the lower pressure of the first frame becomes higher than the upper pressure (vacuum state), and shrink fitting is performed. Or first than fixing force by press fitting
In some cases, the force due to the pressure difference between the lower pressure and the upper pressure of the frame becomes larger. In such a case, the first frame is displaced in the upward direction, the distance between the bearings of the first main bearing and the second main bearing is increased, and this is a cause of bearing burning.

The present invention has been made in order to solve the above problems, and an object thereof is to eliminate the reversing work at the time of assembling the compressor and to shorten the assembling time.

It is another object of the present invention to make the parts common without the need to increase the diameter of the first frame or the second frame even when the diameter of the center shell needs to be increased.

Another object of the present invention is to reduce the cost by designing a spindle and a main bearing for a model with a small capacity so that a spindle for a model with a small capacity can be used for a model with a large capacity. To do. Further, it is also an object of the present invention to make it possible to use an optimal size main bearing for each main bearing and to reduce the cost of the main bearing of a model having a small capacity.

Another object of the present invention is to prevent the first frame from being displaced upward in the axial direction even if the refrigerant gas is filled from the suction side.

[0017]

In order to achieve the above-mentioned object, a scroll compressor according to a first aspect of the present invention comprises a cylindrical container body and an upper portion in the container body, which is arranged in combination with each other. A fixed scroll and an orbiting scroll that are compressed to form a compression chamber, a first frame that is fixed to the inner surface of the upper part of the container body and slidably supports the orbiting scroll, and extends in the direction of the cylinder center and swings at the upper end. A spindle that is slidably connected to the scroll and is rotatably supported by the first frame near the upper end, and fixed to the inner surface of the container body below the first frame and at a predetermined coaxiality with the first frame. A second frame that rotatably supports the lower end of the main shaft in a thrust manner; a stator provided in the container body between the first frame and the second frame; and a stator fixed to the main shaft to construct an electric motor together with the stator. In the scroll compressor having a rotor, the stator of the electric motor is integrally fixed to the second frame, and the second frame to which the stator is fixed is inserted from the lower opening of the container body and fixed to the inner surface of the container body, After the main shaft to which the rotor is fixed is inserted from the upper opening of the container body and supported by the second frame, the first frame is inserted from the upper opening and fixed to the inner surface of the container body with a predetermined coaxiality with the second frame. It is a composition.

According to a second aspect of the present invention, there is provided a scroll compressor having a tubular container body, a fixed scroll and an orbiting scroll which are disposed in an upper portion of the container body and are combined with each other to form a compression chamber, and the container. A first frame fixed to the inner surface of the upper part of the main body and slidably supporting the orbiting scroll, and a first frame extending in the direction of the cylinder center and slidably connected to the orbiting scroll at the upper end portion and near the upper end portion. A main shaft rotatably supported by the frame, and a second frame below the first frame and fixed to the inner surface of the container main body at a predetermined concentricity with the first frame to rotatably support the lower end of the main shaft. A scroll compressor having a stator disposed in the container body between the first frame and the second frame, and a rotor fixed to the main shaft and forming a motor together with the stator, Inner diameter first frame or second
The outer diameter of at least one of the frames is approximately the same, and
The container main body is provided with a ring-shaped frame spacer whose ring outer diameter is substantially the same as the inner peripheral portion of the container main body, and at least one of the first frame and the second frame has a predetermined coaxiality via the frame spacer. It is fixed on the inner surface.

According to a third aspect of the present invention, there is provided a scroll compressor having a tubular container body, a fixed scroll and an orbiting scroll which are disposed in an upper portion of the container body and are combined with each other to form a compression chamber, and the container. A first frame fixed to the inner surface of the upper part of the main body for slidably supporting the orbiting scroll, and a first frame extending in the direction of the cylinder center and slidably connected to the orbiting scroll at the upper end portion and near the upper end portion. A main shaft rotatably supported on the frame via a first main bearing;
A second frame below the frame and fixed to the inner surface of the container body with a predetermined coaxiality with the first frame and rotatably supporting the lower end of the main shaft via a second main bearing;
In a scroll compressor having a stator arranged in a container body between a first frame and a second frame, and a rotor that is fixed to a main shaft and constitutes a motor together with the stator, the ring inner diameter is approximately the same as the outer peripheral portion of the main shaft. And a ring-shaped outer spacer having a ring-shaped outer diameter that is substantially the same as the inner peripheral portion of at least one of the first main bearing and the second main bearing. Is supported by at least one of the first main bearing and the second main bearing.

According to a fourth aspect of the present invention, there is provided the scroll compressor according to the third aspect, wherein the shaft spacer is provided with a balance weight having a predetermined weight.

According to a fifth aspect of the present invention, there is provided a scroll compressor having a tubular container body, a fixed scroll and an orbiting scroll arranged in an upper part of the container body and combined with each other to form a compression chamber, and the container. A first frame fixed to the inner surface of the upper part of the main body for slidably supporting the orbiting scroll, and a first frame extending in the direction of the cylinder center and slidably connected to the orbiting scroll at the upper end portion and near the upper end portion. A main shaft rotatably supported by the frame, and a second frame below the first frame and fixed to the inner surface of the container main body at a predetermined concentricity with the first frame to rotatably support the lower end of the main shaft. A scroll compressor having a stator disposed in the container body between the first frame and the second frame, and a rotor fixed to the main shaft and forming a motor together with the stator, At least one of the frame or the second frame is provided with a first protrusion protruding outward in the radial direction at a portion fixed to the container main body, and the inner protrusion of the container main body is engaged with the first protrusion. A possible first recess is provided.

According to a sixth aspect of the present invention, in the scroll compressor according to the fifth aspect of the present invention, the first protrusion is formed separately from the first frame or the second frame and is fitted in the first recess. Possible projection pieces and the first frame or the second
A projecting piece accommodating portion which is provided on at least one of the frames and accommodates the projecting piece so as to be movable in the radial direction, and an elastic member which is disposed in the projecting piece accommodating portion and biases the protruding piece outward in the radial direction Is.

According to a seventh aspect of the present invention, there is provided the scroll compressor according to the second aspect, wherein the frame spacer is fixed to the container body at a portion where the second projecting portion projects radially outward. And a second concave portion that can be fitted and locked with the second protrusion is provided on the inner surface of the container body.

[0024]

In the scroll compressor according to the first aspect of the present invention, first, the stator of the electric motor is integrally fixed to the second frame. Next, the second frame integrated with the stator is inserted from the lower opening of the container body and fixed to the inner surface of the container body. Then, the main shaft to which the rotor is fixed is inserted from the upper opening of the container body and supported by the second frame. Then, the first frame is inserted from the upper opening and fixed to the inner surface of the container body with a predetermined degree of coaxiality with the second frame. Therefore, the compressor can be assembled without performing the reversing operation.

Further, in the scroll compressor according to the second aspect of the present invention, at least one of the first frame and the second frame is fixed to the inner surface of the container body with a predetermined coaxiality via a frame spacer. Therefore, when it is necessary to increase the diameter of the center shell, the first frame or the second frame can be left unchanged,
It is attached to a large diameter center shell.

In the scroll compressor of the third aspect, the main shaft is supported by at least one of the first main bearing and the second main bearing via a shaft spacer. Therefore, a small-capacity model is used as the main shaft.

Further, in the scroll compressor according to the fourth aspect of the present invention, since the shaft spacer is provided with a balance weight having a predetermined weight, the first balancer or the first balancer for the compressor having a small capacity is used for the compressor having a large capacity. Two balancers are diverted, and the weight equivalent to the insufficient balance amount is compensated by the balance weight of the shaft spacer. Therefore, the first balancer or the second balancer is shared by the compressors having a small capacity.

Further, in the scroll compressor according to the present invention, at least one of the first frame and the second frame is provided in at least one of the first frame and the second frame when assembled in the closed container. The first protrusion is fitted and locked in the first recess on the inner surface of the container body. Accordingly, at least one of the first frame and the second frame is fixed in the axial direction with respect to the container body and does not move. Therefore, the distance between the main bearings that support the main shaft does not change.

Further, in the scroll compressor according to the sixth aspect, when at least one of the first frame and the second frame is assembled to the closed container, the protruding piece of the first protruding portion contacts the inner surface of the container body. Is pushed into the protrusion storage part. Then, when the projection piece reaches the first recess, the projection piece fits into the first recess and is locked by the biasing force of the elastic member. Therefore, the distance between the main bearings that support the main shaft does not change.

Further, in the scroll compressor according to a seventh aspect of the present invention, a second protrusion protruding radially outward is provided at a portion of the frame spacer fixed to the container body, and the second protrusion is provided on the inner surface of the container body. Since the second concave portion that can be fitted and locked with the portion is provided, when it is necessary to increase the diameter of the center shell, the first frame or the second frame need not be changed without changing. It is attached to a large diameter center shell. The distance between the main bearings that support the main shaft does not change.

[0031]

Embodiments of the present invention will be described below with reference to the drawings. However, in the drawings of each embodiment, FIG.
The same or corresponding parts as those of the related art No. 0 are given the same reference numerals and the description thereof will be omitted. Embodiment 1 FIG. FIG. 1 shows an embodiment according to the invention described in claim 1. In the figure, the stator 12 of the electric motor is integrally fixed to the second frame 4 by, for example, bolts 21. Here, the fitting portion 100 between the lower portion of the stator 12 and the second frame 4 is an inlay fitting portion, and the axial center of the stator 12 is configured to match the axial center of the second frame 4.

Further, since the outer peripheral portion 101 of the second frame 4 and the inlay fitting portion 100 are processed so as to be coaxial with each other, the center shell 8 (container body) which supports the outer peripheral portion 101 of the second frame 4 is formed. The inner peripheral surface of) and the stator 12 of the electric motor are also coaxial. Further, the second main bearing 4a and the center shell 8 are also configured to be coaxial.

Next, the compressor assembling method in this embodiment will be described. First, the stator 12 is integrally fixed to the second frame 4 by the bolts 21 or by press fitting, and the lower shell of the center shell 8 is attached from above the stator 12 while being integrally fixed. Then, the second frame 4 is fixedly supported on the inner peripheral surface of the center shell 8 by shrink fitting or press fitting. At this time, the center shell 8 and the second frame 4 are coaxial with each other.

Next, the main shaft 5, to which the first balancer 17 and the rotor 13 are fixed by shrink fitting or press fitting, is inserted into the center shell 8 from the upper opening thereof to be supported by the second frame 4, and then the second frame 4 is further supported. The 1 frame 3 is inserted from the upper opening and fixedly supported on the inner peripheral surface of the center shell 8 by shrink fitting or press fitting. Of course, at this time, the center shell 8 and the first frame 3 are coaxial with each other.

Therefore, in the assembling method up to this point, the reversing device is not necessary at all in the present embodiment, whereas the conventional reversing has been performed twice.
In addition, since the time required for reversing is eliminated and the assembly time can be shortened, a low-cost scroll compressor can be obtained.

Example 2. FIG. 2 shows an embodiment according to the invention described in claim 2. In the figure, reference numeral 50 is a ring-shaped frame whose ring inner diameter is substantially the same as the outer peripheral portion 50a of the first frame 3 and whose outer peripheral portion 50b is substantially the same diameter as the inner peripheral surface of the center shell 8. The spacers are fixedly supported on the outer peripheral portion 50a of the first frame 3 by shrink fitting or press fitting. The outer peripheral portion 50b of the frame spacer 50 is fixedly supported on the inner peripheral surface of the center shell 8 by shrink fitting or press fitting. That is, the inner peripheral surface of the center shell 8 and the first frame 3 are fixed via the frame spacer 50, but are assembled so as to be coaxial. The first frame 3
The outer peripheral portion 50a of the frame has irregularities, and the outer diameter thereof is not necessarily uniform in the axial direction, but the frame spacer 50 has a shape in which the inner peripheral surface of the ring is fixedly supported by the outer peripheral portion 50a of the first frame 3. You only have to have it. The same applies to the ring outer peripheral surface of the frame spacer 50 with respect to the inner peripheral surface of the center shell 8.

Therefore, conventionally, it is necessary to increase the diameter of the center shell 8 when the amount of oil in the oil sump 20 is increased or when the diameter of the stator 12 is increased to improve the efficiency of the electric motor. However, at that time, it is necessary to increase the diameter of the first frame 3 fixed to the inner peripheral surface of the center shell 8 by shrink fitting, press fitting, or the like.
The first frame with a large diameter was newly manufactured.

However, according to this embodiment, even if the diameter of the center shell 8 is increased, the frame spacer 50 is interposed between the frame spacer 50 and the first frame 3.
It is not necessary to newly manufacture the first frame having a large diameter dimension, and the manufacturing time can be shortened. Further, since the number of types of the first frame does not increase, the number of setup changes during processing does not increase, the processing time can be shortened, and the processing cost can be reduced.

In this embodiment, the frame spacer 50 provided between the first frame 3 and the center shell 8 has been described, but a dedicated frame spacer is interposed between the second frame 4 and the center shell 8. It goes without saying that the same effect can be obtained in this case as well.

Example 3. FIG. 3 shows an embodiment according to the invention described in claim 3. In the figure, reference numeral 200 denotes a shaft spacer formed in a ring shape having a ring inner diameter substantially the same as the outer peripheral portion of the main shaft 5 and a ring outer diameter substantially the same diameter as the inner peripheral portion of the second main bearing 4a. , Main shaft 5 and second main bearing 4a
It is assembled by press fitting etc. That is, the main shaft 5 is supported by the second main bearing 4a via the shaft spacer 200. Therefore, even if the diameter of the main shaft 5 remains the same when the bearing has a large capacity and the bearing load is large,
By increasing the outer diameter of the shaft spacer 200, a bearing having a large bearing load capacity can be used as the second main bearing 4a. As a result, even a model with a large capacity can be reused with a spindle for a model with a small capacity, the spindle can be shared, and the cost can be further reduced.

In this embodiment, the second frame 4 side second
Spacer 2 arranged between the main bearing 4a and the main shaft 5
00 has been described, the same effect can be obtained when a dedicated shaft spacer is interposed between the first main bearing 3a on the first frame 3 side and the main shaft 5.

Embodiment 4 FIG. FIG. 4 shows an embodiment according to the invention described in claim 4. In the figure, in this embodiment, a shaft spacer is used in which a balance weight portion 200a having a weight corresponding to the shortage is added to the shaft spacer 200 described in the third embodiment. Therefore, even if a second balancer fixed to the rotor 13 for a large-capacity model is not newly manufactured, the weight equivalent to the insufficient balance weight can be compensated by the balance weight portion 200a of the shaft spacer 200. There is no need to change even the rotor 13 because only the second balancer 18 is different as in the conventional case, and the rotor 13 can be shared. This eliminates the need to newly manufacture the rotor 13 for a large-capacity model, and prevents the rotor 13 from being assembled by mistake. Further, as described in the third embodiment, since the spindle 5 having a small capacity can be used, the cost can be reduced.

Example 5. FIG. 5 shows an embodiment according to the invention described in claim 5. In the figure, reference numeral 300 denotes a fixed portion of the first frame 3 to which the center shell 8 is fixed, and a protruding portion (first protruding portion) that protrudes outward in the radial direction, and 304 denotes a protruding portion provided on the inner peripheral surface of the center shell 8. It is a concave portion (first concave portion) that can be fitted and locked with the portion 300. With the first frame 3 supported by the fitting and locking of the protrusion 300 and the recess 304 as a boundary, the hermetic container 80
The inner space is partitioned into an upper space 40 and a lower space 41.

Therefore, when the refrigerant gas is charged from the suction pipe 15 side after the inside of the compressor is evacuated, the pressure P _{2 in} the lower space 41 becomes higher than the pressure P _{1 in the} upper space 40, and An upward force due to the pressure (P ₂ −P ₁ ) acts on the first frame 3. However, since the protrusion 300 of the first frame 3 is fitted and locked in the recess 304 of the center shell 8, it does not move upward in the axial direction.
As a result, the seizure of the bearing due to the change in the inter-bearing distance due to the upward movement of the first frame 3 is eliminated.

Further, even when a downward force is applied to the first frame 3 due to a compressive load during normal operation, the protrusion 300 and the recess 304 are locked to prevent the first frame 3 from being displaced. .

Although the first frame 3 has been described in this embodiment, the second frame 4 is provided with a dedicated protrusion, and the inner shell of the center shell 8 is fitted with the protrusion for the second frame 4. The same effect can be obtained by providing a recess that can be stopped.

Embodiment 6 FIG. FIG. 6 shows an embodiment according to the invention described in claim 6. In the figure, reference numeral 301 denotes a structure different from that of the first frame 3, and a projection piece 30 formed to be engageable with and engageable with a recess 304 on the inner peripheral surface of the center shell 8.
Reference numeral 3 denotes a projecting piece housing portion provided on the first frame 3 for housing the projecting piece 301 so as to be movable in the radial direction. Reference numeral 302 denotes an elastic member provided in the projecting piece housing portion 303 for biasing the projecting piece 301 outward in the radial direction. Is. As the elastic member 302, for example, a coil spring is used in this embodiment.

Here, the projecting piece 301 is biased by the elastic member 302 so as to project outward in the radial direction from the outer peripheral surface of the first frame 3 when housed in the center shell 8. These projection pieces 301 and the projection piece storage portion 3
03, the elastic member 302, the projection 30 of this embodiment.
0 (first protrusion) is configured.

Therefore, when the first frame 3 is inserted into the center shell 8, the protruding piece 301 of the protruding portion 300 can be housed inward in the radial direction so as not to protrude from the outer peripheral portion of the first frame 3. . As a result, the insertability of the first frame 3 is improved, and the insert time can be shortened.
Needless to say, the same effect as described in the fifth embodiment can be obtained.

Further, in this embodiment, the protrusion 3 including the protrusion 301, the protrusion accommodating portion 303, and the elastic member 302.
Although 00 is provided on the first frame 3, the same effect can be obtained when such a protrusion is provided on the second frame 4 and a recess is formed on the inner peripheral surface of the center shell 8 at the opposing position.

Example 7. FIG. 7 shows an embodiment according to the invention described in claim 7. In the figure, 50 is a frame spacer. A protruding portion 300 (second protruding portion) protruding outward in the radial direction is provided at a portion of the frame spacer 50 fixed to the center shell 8.
In addition, a concave portion 304 (second concave portion) that can be fitted and locked with the protruding portion 300 is formed on the inner peripheral surface of the center shell 8. Therefore, according to this embodiment, in addition to the operation and effect of the second embodiment in which parts can be shared, the operation and effect of the fifth embodiment in which deterioration of bearing reliability can be prevented can be obtained.

Further, as shown in FIG. 8, the projection piece 301, the projection piece storage portion 303, and the elastic member 3 similar to those of the sixth embodiment.
The protrusion 300 (second protrusion) composed of
When the concave portion 304 (second concave portion) is formed on the inner surface of the center shell 8 while being fitted to the frame spacer 50, the concave portion 304 (second concave portion) capable of being fitted and locked with the protruding piece 301 of the protruding portion 300,
The same action and effect as the scroll compressor of the sixth embodiment are added.

[0053]

As described above, according to the scroll compressor of the first aspect of the present invention, since the stator of the electric motor is previously fixed integrally to the second frame, the stator is fixed. Hold the bottom opening of the container body above the second frame, press down the container body from above by shrink fitting or press fitting, and fix the second frame to the inner surface. After inserting from the upper side, the first frame is further inserted from the opening on the upper surface of the container body, and assembled by shrink fitting or press fitting. Therefore, the compressor can be assembled with good workability without reversing the container body, and thus the reversing device is not required, and the time required for reversing can be shortened.

Further, according to the scroll compressor of the second aspect, since the frame spacer is interposed between at least one of the first frame or the second frame and the inner surface of the container body, the required oil amount can be reduced. When it is necessary to increase the diameter of the container body, such as when increasing the diameter of the stator or increasing the diameter of the stator to improve the efficiency of the motor, change the first frame or the second frame without changing it. Even if it is not necessary, the frame spacer is fixed to the outer periphery of the first frame or the second frame by shrink fitting or press fitting, and the outer periphery of the frame spacer and the container body are fixed by shrink fitting or press fitting, thereby The first frame or the second frame can be shared regardless of the inner diameter. Therefore, compared to the case where the first frame or the second frame is changed according to the inner diameter of the container, the number of types of the first frame or the second frame does not increase, so the number of setup changes during processing does not increase and the processing time is shortened. Therefore, the processing cost can be reduced.

Further, according to the scroll compressor of the third aspect, since the shaft spacer is interposed between at least one of the first main bearing or the second main bearing and the main shaft, the bearing portion is provided. Even if a spindle with a shaft diameter equivalent to that of a small-capacity model is used, by fixing the shaft spacer to the spindle by shrink fitting or press fitting, etc., the outer diameter of this shaft spacer corresponds to a model with a large capacity. Can be obtained. Therefore, since a spindle having a small capacity can be used as the spindle, the spindle can be shared and the cost can be reduced.

According to the scroll compressor of the fourth aspect, since the shaft spacer is provided with a balance weight having a predetermined weight, even an existing balancer for a compressor having a small capacity has a large capacity as it is. Can be used for In other words, since the balance weight of the shaft spacer can compensate for the predetermined weight corresponding to the insufficient balance amount, it is not necessary to manufacture a new balancer for a compressor with a large capacity, and a balancer with a compressor with a small capacity can be used. Can be shared. Therefore, in addition to standardizing the main shaft, the balancer can also use a small capacity compressor for a large capacity compressor.
Cost can be reduced.

Further, according to the scroll compressor of the fifth aspect, at the fixing portion of at least one of the first frame and the second frame, which is fixed to the container body, the first projecting portion projecting outward in the radial direction. Is provided on the inner surface of the container body.
Since the first concave portion that fits with the protruding portion of the
Even when the frame or the second frame receives a force in the direction opposite to that in the normal operation, the first protrusion is fitted and locked in the first concave portion of the container body. The second frame does not move in the axial direction.
Therefore, since the distance between the bearings does not change, it is possible to prevent deterioration of the bearing reliability.

Further, according to the scroll compressor of the sixth aspect, since the projection piece having a structure different from that of the first frame or the second frame is housed in the projection piece housing portion so as to be movable in the radial direction, When the first frame or the second frame is press-fitted or shrink-fitted to the inner surface of the container body, the projecting piece is pushed into the projecting piece housing portion against the biasing force of the elastic member. The insertability into the container body is improved, and the time required for insertion can be shortened.

According to the scroll compressor of the seventh aspect, since the frame spacer is provided with the second protrusion protruding outward in the radial direction, the parts can be shared by the invention according to the second aspect. In addition to the effect, the effect of preventing deterioration of the bearing reliability according to the fifth aspect of the invention can be obtained.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a scroll compressor showing an embodiment according to the invention as set forth in claim 1.

FIG. 2 is a vertical cross-sectional view of a scroll compressor showing an embodiment according to the invention described in claim 2.

FIG. 3 is a vertical sectional view of a scroll compressor showing an embodiment according to the invention as set forth in claim 3.

FIG. 4 is a sectional view of a spacer showing an embodiment according to the invention described in claim 4.

FIG. 5 is a vertical cross-sectional view of a scroll compressor showing an embodiment according to the invention described in claim 5.

FIG. 6 is a vertical cross-sectional view of a scroll compressor showing an embodiment according to the invention as set forth in claim 6.

FIG. 7 is a vertical cross-sectional view of a scroll compressor showing an embodiment according to the invention as set forth in claim 7.

FIG. 8 is a vertical sectional view of a scroll compressor according to another embodiment of the invention as set forth in claim 7.

FIG. 9 is a vertical sectional view showing a conventional scroll compressor.

FIG. 10 is an explanatory diagram for explaining an assembling method of a conventional scroll compressor.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Fixed scroll, 2 Oscillating scroll, 3 1st frame, 3a 1st main bearing, 4 2nd frame, 4a
Second main bearing, 5 main shaft, 8 center shell, 12
Stator, 13 rotor, 19 compression chamber, 50 frame spacer, 200 shaft spacer, 200a balance weight part, 300 protruding part, 301 protruding piece, 302
Elastic member, 303 Projecting piece storage section, 304 Recessed section.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Koji Masumoto 6-5-6 Tehira, Wakayama City Mitsubishi Electric Corporation Wakayama Factory

Claims (7)

[Claims] 1. A tubular container main body, a fixed scroll and an orbiting scroll which are arranged in an upper part of the container main body and are combined with each other to form a compression chamber, and the rocker fixed to an inner surface of an upper part of the container main body. A first frame that slidably supports a scroll, and a first frame that extends in the direction of the cylinder center and is slidably connected to the orbiting scroll at an upper end portion and rotatably supported by the first frame near the upper end portion. A main shaft, a second frame below the first frame and fixed to the inner surface of the container main body at a predetermined concentricity with the first frame, and rotatably supporting the lower end of the main shaft in a thrust direction; A scroll compressor having a stator disposed in the container body between one frame and the second frame, and a rotor that is fixed to the main shaft and constitutes a motor together with the stator. The stator of the electric motor is integrally fixed to the second frame, and the second frame fixed to the stator is inserted from the lower opening of the container body and fixed to the inner surface of the container body.
After the main shaft to which the rotor is fixed is inserted from the upper opening of the container body and supported by the second frame, the first frame is inserted from the upper opening to the second frame.
A scroll compressor, wherein the scroll compressor is fixed to the inner surface of the container body with a predetermined coaxiality with a frame. 2. A tubular container body, a fixed scroll and an orbiting scroll which are arranged in an upper portion of the container body and are combined with each other to form a compression chamber, and the orbit which is fixed to an inner surface of an upper portion of the container body. A first frame that slidably supports a scroll, and a first frame that extends in the direction of the cylinder center and is slidably connected to the orbiting scroll at an upper end portion and rotatably supported by the first frame near the upper end portion. A main shaft, a second frame below the first frame and fixed to the inner surface of the container main body at a predetermined concentricity with the first frame, and rotatably supporting the lower end of the main shaft in a thrust direction; A scroll compressor having a stator disposed in the container body between one frame and the second frame, and a rotor that is fixed to the main shaft and constitutes a motor together with the stator. In addition, the ring inner diameter is substantially the same as the outer peripheral portion of at least one of the first frame and the second frame, and the ring outer diameter is formed in a ring shape having substantially the same diameter as the inner peripheral portion of the container body. A scroll compressor, further comprising a frame spacer, wherein at least one of the first frame and the second frame is fixed to the inner surface of the container body with a predetermined degree of coaxiality via the frame spacer. 3. A cylindrical container main body, a fixed scroll and an orbiting scroll that are arranged in an upper part of the container main body and are combined with each other to form a compression chamber, and the rocker fixed to an inner surface of an upper part of the container main body. A first frame that slidably supports the scroll, a first main bearing that extends in the direction of the cylinder center, is slidably connected to the orbiting scroll at the upper end, and is provided on the first frame near the upper end. A main shaft that is rotatably supported via a main shaft and a lower end of the main shaft that is fixed to the inner surface of the container body below the first frame and has a predetermined coaxiality with the first frame. A second frame that is rotatably supported by thrust through a first frame;
In a scroll compressor having a stator disposed in the container body between a frame and the second frame, and a rotor that is fixed to the main shaft and constitutes a motor together with the stator, a ring inner diameter is the outer peripheral portion of the main shaft. The main shaft includes a shaft spacer formed in a ring shape having substantially the same diameter and a ring outer diameter substantially the same as the inner peripheral portion of at least one of the first main bearing and the second main bearing. Is supported by at least one of the first main bearing and the second main bearing via the shaft spacer. 4. The scroll compressor according to claim 3, wherein the shaft spacer is provided with a balance weight having a predetermined weight. 5. A tubular container body, a fixed scroll and an orbiting scroll which are arranged in an upper portion of the container body and are combined with each other to form a compression chamber, and the orbit which is fixed to an inner surface of an upper portion of the container body. A first frame that slidably supports a scroll, and a first frame that extends in the direction of the cylinder center and is slidably connected to the orbiting scroll at an upper end portion and rotatably supported by the first frame near the upper end portion. A main shaft, a second frame below the first frame and fixed to the inner surface of the container main body at a predetermined concentricity with the first frame, and rotatably supporting the lower end of the main shaft in a thrust direction; A scroll compressor having a stator disposed in the container body between one frame and the second frame, and a rotor that is fixed to the main shaft and constitutes a motor together with the stator. At least one of the first frame and the second frame is provided with a first protrusion projecting outward in the radial direction at a portion fixed to the container body on the inner surface of the container body. A scroll compressor provided with a first recess that can be fitted and locked with the first protrusion. 6. The first projecting portion has a projecting piece formed separately from the first frame or the second frame so as to be capable of fitting with the first recessed portion, and the first projecting portion of the first frame or the second frame. A projection piece storage portion which is provided on at least one side and stores the projection piece movably in the radial direction; and an elastic member which is provided in the projection piece storage portion and biases the projection piece outward in the radial direction. The scroll compressor according to claim 5, which is characterized in that. 7. A second protrusion projecting outward in the radial direction is provided at a portion of the frame spacer fixed to the container body, and an inner surface of the container body is fitted and locked with the second protrusion. 3. A scroll compressor according to claim 2, characterized in that a possible second recess is provided.