JP2020125749A - Scroll compressor and method for assembling scroll compressor - Google Patents

Abstract

To provide a scroll compressor in which the position of a rocking scroll can be adjusted with respect to a fixed scroll, and a method for assembling the scroll compressor.SOLUTION: A scroll compressor 1 comprises: a cylindrical main shell 10; a fixed scroll 20 housed in the main shell 10, and fixed to an inner wall of the main shell 10; and a main frame 40 comprising a holding part 42 rockably holding a rocking scroll 30 with respect to the fixed scroll 20, an engaging part 43 fixing the holding part 42 to the inner wall, and a position variable groove 44 provided between the holding part 42 and the engaging part 43, and capable of changing the position of the holding part 42 with respect to the engaging part 43 by deforming depending on thermal deformation of the main shell 10.SELECTED DRAWING: Figure 7

Description

The present invention relates to a scroll compressor and a method for assembling the scroll compressor.

Some scroll compressors have a highly precise combination of fixed scroll and orbiting scroll spirals.

For example, Patent Document 1 discloses a scroll compressor including a fixed scroll, a frame that holds the orbiting scroll in a swingable manner, and a cylindrical shell that houses the fixed scroll and the frame.

In the scroll compressor described in Patent Document 1, two protrusions that are separated from each other in the axial direction of the cylinder are provided on the inner wall of the shell, and the fixed scroll and the frame are locked to each of these protrusions. Thereby, in the scroll compressor described in Patent Document 1, the spiral body of the fixed scroll and the spiral body of the orbiting scroll are positioned with high accuracy in the cylindrical axis direction of the shell.

International Publication No. 2018/078787

In the scroll compressor described in Patent Document 1, after fixing the fixed scroll to the protruding portion, heat treatment such as shrink fitting and arc spot welding is performed to fix the fixed scroll to the shell. As a result, thermal stress is generated in the heat treatment, and the position of the scroll body of the orbiting scroll with respect to the scroll body of the fixed scroll may be displaced.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a scroll compressor capable of adjusting the position of the orbiting scroll with respect to the fixed scroll, and an assembling method of the scroll compressor.

In order to achieve the above object, a scroll compressor according to the present invention includes a tubular shell, a fixed scroll housed in the shell and fixed to an inner wall of the shell, a holding portion, a fixing portion, and a position varying portion. And a frame having the same. The holding portion holds the orbiting scroll so as to be capable of swinging with respect to the fixed scroll. The fixing portion fixes the holding portion to the inner wall. The position varying unit is provided between the holding unit and the fixed unit, and is capable of changing the position of the holding unit with respect to the fixed unit by deforming according to thermal deformation of the shell.

According to the configuration of the present invention, it is possible to change the position of the holding portion with respect to the fixed portion by deforming the position varying portion according to thermal deformation of the shell. Therefore, by thermally deforming the shell, the position of the holding portion can be changed, and the position of the orbiting scroll swingably held by the holding portion can be changed. Thereby, the position of the orbiting scroll with respect to the fixed scroll can be adjusted.

1 is a perspective view of a scroll compressor according to an embodiment of the present invention. Sectional drawing of the scroll compressor which concerns on embodiment of this invention. The perspective view of the main shell with which the scroll compressor which concerns on embodiment of this invention is equipped. The perspective view of the fixed scroll with which the scroll compressor which concerns on embodiment of this invention is equipped. The perspective view of the main frame with which the scroll compressor which concerns on embodiment of this invention is equipped. The perspective view of the Oldham ring with which the scroll compressor which concerns on embodiment of this invention is equipped. Enlarged sectional view of the VII region shown in FIG. Sectional drawing of a position variable groove|channel when the main shell with which the scroll compressor which concerns on embodiment of this invention is thermally deformed Enlarged sectional view of the IX region shown in FIG. Sectional drawing of the modification of the position variable groove with which the scroll compressor which concerns on embodiment of this invention is equipped. Sectional drawing of another modification of the position variable groove with which the scroll compressor which concerns on embodiment of this invention is equipped.

Hereinafter, a scroll compressor according to an embodiment of the present invention and a method for assembling the scroll compressor will be described in detail with reference to the drawings. In the drawings, the same or equivalent parts are designated by the same reference numerals. In the Cartesian coordinate system XYZ shown in the figure, when the suction pipe of the scroll compressor is arranged on the right, the horizontal direction is the X axis, the vertical direction is the Z axis, and the direction orthogonal to the X axis and the Z axis is the Y axis. .. Hereinafter, this coordinate system will be referred to and described as appropriate.

In the scroll compressor according to the embodiment, the position variable groove is provided in the main frame that holds the orbiting scroll in order to adjust the position of the orbiting scroll with respect to the fixed scroll to a desired position. First, the configuration of the scroll compressor will be described with reference to FIGS. 1 to 6. Next, the position variable groove of the main frame will be described with reference to FIG. Next, with reference to FIGS. 8 and 9, an assembling method of the scroll compressor using the position variable groove will be described.

FIG. 1 is a perspective view of a scroll compressor 1 according to an embodiment of the present invention. FIG. 2 is a cross-sectional view of the scroll compressor 1. FIG. 3 is a perspective view of the main shell 10 included in the scroll compressor 1. FIG. 4 is a perspective view of the fixed scroll 20 included in the scroll compressor 1. FIG. 5 is a perspective view of the main frame 40 included in the scroll compressor 1. FIG. 6 is a perspective view of the Oldham ring 50 included in the scroll compressor 1. In FIG. 2, the thrust plate is omitted for easy understanding.

As shown in FIGS. 1 and 2, the scroll compressor 1 includes a main shell 10 that defines the outer shape of the device, a fixed scroll 20 that forms a compression chamber that compresses the refrigerant that is supplied to the scroll compressor 1, and rocking. A scroll 30 and a main frame 40 that swingably holds the orbiting scroll 30 are provided.

The main shell 10 is formed in a cylindrical shape. Further, the main shell 10 is connected with a suction pipe 11 for sucking the refrigerant to be compressed into the device. On the other hand, the upper and lower ends of the main shell 10 are open as shown in FIG. The upper end and the lower end are covered with a hemispherical upper shell 12 and a lower shell 13. A discharge pipe 14 that discharges the compressed refrigerant from the inside of the apparatus is connected to the upper shell 12. Further, the lower shell 13 is provided with a fixing base 15 for fixing the device. In the present specification, the main shell 10 is also simply referred to as a shell.

As shown in FIG. 3, the main shell 10 includes a first inner wall 110 and a second inner wall 110 having a radius smaller than that of the first inner wall 110 and protruding from the first inner wall 110 toward the cylindrical shaft side of the main shell 10, as shown in FIG. An inner wall 120 and a third inner wall 130, which has a smaller radius than the second inner wall 120 and projects further toward the cylinder axis than the second inner wall 120, are formed.

As shown in FIG. 2, the fixed scroll 20 is fitted to the first inner wall 110. The fixed scroll 20 is engaged with the step between the first inner wall 110 and the second inner wall 120, that is, the upper end of the second inner wall 120. Thereby, the fixed scroll 20 is accommodated in the space surrounded by the first inner wall 110 of the main shell 10. Further, the fixed scroll 20 is positioned in the cylinder axis direction of the main shell 10. The fixed scroll 20 is fixed to the first inner wall 110 by shrink fitting.

On the other hand, the main frame 40 is fitted to the second inner wall 120. Then, the stepped portion between the second inner wall 120 and the third inner wall 130, that is, the upper end of the third inner wall 130, is engaged with an engagement portion 43 of the main frame 40, which will be described later. As a result, the main frame 40 is housed in the space surrounded by the second inner wall 120 of the main shell 10. The main frame 40 is positioned in the cylinder axis direction of the main shell 10. The main frame 40 is fixed to the second inner wall 120 by press fitting.

As shown in FIGS. 2 and 4, the fixed scroll 20 is provided on the first substrate 21 fitted to the first inner wall 110 and below the first substrate 21, and is engaged with the second inner wall 120. The unit 22 and a first spiral body 23 provided below the first substrate 21 and concentric with the first substrate 21 are included.

The first substrate 21 is formed in a disk shape, and is fixed to the first inner wall 110 by shrink fitting, as described above.

On the other hand, the engagement portion 22 projects from the first spiral body 23 in the radial direction of the first substrate 21, as shown in FIG. 4. On the second inner wall 120 of the main shell 10 described above, as shown in FIG. 3, the phase determining groove 121 is formed. Although not shown, the engaging portion 22 engages with the phase determining groove 121 when the first substrate 21 is fitted to the first inner wall 110. Thereby, the engaging portion 22 determines the position of the first substrate 21 in the circumferential direction.

As shown in FIG. 4, the first spiral body 23 is formed in a shape in which a plate is spirally bent. The spiral has a smaller diameter than the second inner wall 120 of the main shell 10. As shown in FIG. 2, the first spiral body 23 has the tip of the spiral plate, that is, the tooth tip facing the orbiting scroll 30.

The orbiting scroll 30 is provided on the second substrate 31 formed in the shape of a disc having a diameter smaller than that of the second inner wall 120 and on the upper side of the second substrate 31 so that the orbiting scroll 30 can be orbited in the main shell 10. , A second spiral body 32 concentric with the second substrate 31, and a cylindrical portion 33 provided below the second substrate 31 and concentric with the second substrate 31.

The second spiral body 32 is formed in a shape in which a plate is spirally bent, like the first spiral body 23 of the fixed scroll 20. Its diameter is smaller than that of the second substrate 31. Then, the second spiral body 32 has the tooth tips facing upward. The second spiral body 32 meshes with the first spiral body 23 to form a compression chamber with the first spiral body 23.

On the other hand, although not shown in FIG. 2, the second substrate 31 is placed on a thrust plate, which will be described later, provided on the upper surface of the main frame 40. Here, the thrust plate is a plate that adjusts the gap between the tooth tip of the second spiral body 32 and the first substrate 21 of the fixed scroll 20 to a desired size, and has a smooth upper surface. A plate that functions as a thrust bearing. Two key grooves 310 are arranged on the lower surface of the second substrate 31 with the thrust plate interposed therebetween. The key portions 51 of the Oldham ring 50 shown in FIG. 6, which prevent the orbiting scroll 30 from rotating during the orbit, are inserted into the two key grooves 310, respectively. Returning to FIG. 2, the cylindrical portion 33 is arranged at the center of the second substrate 31.

A bush 60 having a cylindrical portion is inserted in the cylindrical portion 33. Here, the bush 60 is a member for connecting the crankshaft 70 to the cylindrical portion 33. An eccentric portion 71 included in the crankshaft 70 is inserted into the bush 60.

The crankshaft 70 has the above-described eccentric portion 71 and the main shaft portion 72 extending downward from the eccentric portion 71. Below the third inner wall 130 of the main shell 10, a fourth inner wall 140 having the same diameter as the second inner wall 120 is formed. A sub-frame 90 having a bearing 91 is fitted to the fourth inner wall 140. The main shaft portion 72 of the crankshaft 70 is rotatably supported by its bearing 91. The crankshaft 70 rotates around the main shaft portion 72 by a drive mechanism 80 including a rotor 81 fixed to the outer peripheral wall of the main shaft portion 72 and a stator 82 fixed to the third inner wall 130 of the main shell 10. To be rotated.

The bush 60 is inserted into the cylindrical portion 33 as described above. The eccentric portion 71 of the crankshaft 70 is inserted into the bush 60. Therefore, when the main shaft portion 72 of the crankshaft 70 rotates, the rotation of the main shaft portion 72 is transmitted to the cylindrical portion 33 via the bush 60. In the crankshaft 70, since the eccentric portion 71 is eccentric with respect to the main shaft portion 72, the cylindrical portion 33 revolves when the main shaft portion 72 rotates. As a result, the orbiting scroll 30 orbits as a whole. On the other hand, the cylindrical portion 33 is rotatably held by the main frame 40 together with the bush 60.

As shown in FIGS. 2 and 5, the main frame 40 includes a bearing portion 41 that rotatably holds the main shaft portion 72 of the crankshaft 70, and the above-described holding portion 42 that rotatably holds the orbiting scroll 30. The engaging portion 43 is press-fitted into the second inner wall 120 of the main frame 40. In the present specification, the main frame 40 is also simply referred to as a frame.

The bearing portion 41 has a cylindrical inner wall into which the main shaft portion 72 of the crankshaft 70 can be inserted. Then, as shown in FIG. 2, the main shaft portion 72 is inserted into the bearing portion 41, and rotatably holds the main shaft portion 72 as described above. The holding portion 42 is arranged above the bearing portion 41.

As shown in FIG. 5, the holding portion 42 is formed in an annular shape in a top view. The upper surface is formed flat. Although not shown, the thrust plate described above is placed on the upper surface of the holding portion 42. The second substrate 31 of the orbiting scroll 30 is placed on the thrust plate. In the holding portion 42, when the bush 60 is rotated by the rotation of the crankshaft 70, the rotation is transmitted to the second substrate 31. Accordingly, on the upper surface of the holding portion 42, the second substrate 31 rotates due to the rotation of the bush 60.

On the other hand, in the center of the holding portion 42, a small cylindrical space 421 and a large cylindrical space 422 connected to the small cylindrical space 421 are formed from below.

As shown in FIG. 2, the bush 60 into which the eccentric portion 71 of the crankshaft 70 is inserted is inserted into the small cylindrical space 421. The bush 60 is rotatably held.

On the other hand, the Oldham ring 50 is housed in the large cylindrical space 422. As shown in FIG. 5, in the large cylindrical space 422, two key grooves 423 having a rectangular shape in a top view are formed so as to sandwich the cylindrical axis. The two key portions 52 of the Oldham ring 50 shown in FIG. 6 are inserted into the two key grooves 423, and the key portions 52 are slidable in the longitudinal direction of the key groove 423. Although not shown, the key groove 423 is orthogonal to the longitudinal direction of the key groove 310 on the second substrate 31 of the swing scroll 30 described above. The key groove 423 slides the key portion 52 of the Oldham ring 50 by the rotation of the bush 60, and the key groove 310 of the second substrate 31 also slides the key portion 51. Thereby, the key groove 423 prevents the second substrate 31, that is, the orbiting scroll 30 from rotating.

As shown in FIG. 5, the engagement portion 43 is formed in the shape of a protrusion that protrudes from the holding portion 42 in the radial direction. The engagement portion 43 is formed over the entire outer circumference of the holding portion 42. The engagement portion 43 has an outer diameter such that it can be press-fitted into the second inner wall 120 of the main shell 10. The outer diameter is smaller than the inner diameter of the third inner wall 130. The engagement portion 43 is fixed to the second inner wall 120 by press fitting the main frame 40 into the second inner wall 120. Further, the engagement portion 43 is engaged with the upper end of the third inner wall 130, as shown in FIG. In addition, in the present specification, since the engaging portion 43 is fixed to the main shell 10, the engaging portion 43 is also referred to as a fixing portion.

Returning to FIG. 5, the engaging portion 43 is further formed with an engaging portion 425 protruding in the radial direction of the holding portion 42. Although not shown, the engaging portion 425 engages with the phase determining groove 121 of the main shell 10 to determine the circumferential position of the holding portion 42.

As described above, the first substrate 21 of the fixed scroll 20 is fixed to the first inner wall 110 of the main shell 10 by shrink fitting. On the other hand, the engagement portion 43 of the main frame 40 is press-fitted into the second inner wall 120 of the main shell 10. Therefore, of the first substrate 21 and the engaging portion 43, only the first substrate 21 is thermally deformed by the heat of shrink fitting, and as a result, the distance between the first substrate 21 and the main frame 40 changes. I may end up doing it. The gap between the first substrate 21 and the tooth tip of the second spiral body 32 of the orbiting scroll 30 held by the main frame 40 does not have a desired size, and the gap becomes larger or smaller than the desired size. It may become.

However, if the gap between the first substrate 21 and the tooth tip of the second spiral body 32 is too large or too small, sufficient compression of the refrigerant in the compression chamber formed by the first spiral body 23 and the second spiral body 32 will occur. I can't do it.

Therefore, in order to adjust the size of the gap between the first substrate 21 and the tooth tip of the second spiral body 32, as shown in FIG. 2, between the holding portion 42 and the engaging portion 43 of the main frame 40. Further, a position variable groove 44 for changing the position of the main frame 40 is provided. Next, the position variable groove 44 will be described with reference to FIG. 7.

FIG. 7 is an enlarged cross-sectional view of the VII region shown in FIG.
As shown in FIG. 7, a position variable groove 44 for changing the position of the holding portion 42 is formed in a portion connecting the engaging portion 43 and the holding portion 42. The position variable groove 44 is recessed upward from the lower surface of the engaging portion 43. The depth is, for example, half the thickness of the engaging portion 43. As a result, the position variable groove 44 reduces the thickness of the portion connecting the engaging portion 43 and the holding portion 42, and facilitates deformation.

As described above, the engagement portion 43 is press-fitted into the second inner wall 120 of the main shell 10. As will be described later, the distance between the first substrate 21 and the tooth tips of the second spiral body 32 is adjusted by locally heating the main shell 10. Accordingly, the main shell 10 is thermally deformed, and the position of the second inner wall 120 of the main shell 10 in which the engaging portion 43 is press-fitted and the second inner wall 120 and the third inner wall 130 with which the engaging portion 43 engages. Change the position of the step between and. As a result, the position of the holder 42 changes. At this time, the position variable groove 44 has its width changed to facilitate deformation of the portion connecting the engaging portion 43 and the holding portion 42. As a result, the size of the gap between the first substrate 21 and the tooth tip of the second spiral body 32 changes. In addition, in this specification, the position variable groove 44 is also referred to as a position variable portion. Further, since the lower surface of the engaging portion 43 is recessed, the position variable groove 44 is also referred to as a recess.

On the other hand, the engaging portion 43 has a chamfered portion 45 at the upper corner on the outer peripheral side. When the main shell 10 is thermally deformed and the second inner wall 120 is deformed toward the inside of the main shell 10, the chamfered portion 45 contacts the second inner wall 120 and prevents the main shell 10 from being thermally deformed too much. To prevent. The angle of inclination of the chamfered portion 45 with respect to the end face of the engaging portion 43, and the size thereof are determined according to the degree of thermal deformation to be prevented.

Next, a method of assembling the scroll compressor 1 will be described with reference to FIGS. 8 and 9. Along with the description of the assembling method, a method of adjusting the size of the gap between the first substrate 21 and the tooth tip of the second spiral body 32 using the position variable groove 44 will be described.

In the following description, each time the scroll compressor 1 is designed or for each manufacturing lot, the heat conditions for shrink fitting are preliminarily tested and the amount of deviation caused by the deformation of the fixed scroll 20 due to the shrink fitting. Relationships should be sought. Here, the shift amount is the magnitude of the shift when the gap between the first substrate 21 and the tooth tip of the second spiral body 32 deviates from the desired dimension. For example, when the shrink fitting heating conditions and the surface of the second spiral body 32 in contact with the tooth tips are the PQ plane shown in FIG. 7, the distance D from the PQ plane to the lower surface of the first substrate 21 and the inclination with respect to the PQ plane The relationship with θ will be obtained. Here, the distance D is the distance at the origin when the origin is a point where the PQ plane intersects with the cylindrical axis of the main shell 10. Further, it is assumed that the heating conditions of the main shell 10 for eliminating the deviation amount are obtained, for example, the main shell 10 is thermally deformed in order to set the above-mentioned distance D to a desired dimension and set the inclination θ to 0. The heating conditions such as the position of local heating for heating, the heating amount, and the like are obtained. In this way, a database showing the relationship between the shrink fitting heating conditions and the heating conditions for adjusting the main shell 10 is created.

FIG. 8 is a cross-sectional view of the position variable groove 44 when the main shell 10 is thermally deformed. 9 is an enlarged cross-sectional view of the IX region shown in FIG.

First, the crankshaft 70, the stator 82, and the subframe 90 are assembled in the main shell 10 having the above-described shape.

Next, the main frame 40 is inserted from the upper end of the main shell 10 and the main frame 40 is press-fitted into the main shell 10. In this step, the inserted main frame 40 is pushed to a step between the second inner wall 120 and the third inner wall 130 of the main shell 10, and the engaging portion 43 of the main frame 40 is engaged with the step. As a result, the main frame 40 is positioned in the cylinder axis direction of the main shell 10. Further, the engagement portion 425 is engaged with the phase determining groove 121 to determine the circumferential position of the main frame 40. In addition, in this specification, since the fixed scroll 20 is fixed to the main shell 10 in this step, it is also referred to as a first fixing step.

Then, the thrust plate, the orbiting scroll 30, the bush 60, the Oldham ring 50, the lower shell 13 and the like are attached to the main shell 10 to which the main frame 40 is fixed.

Next, the main shell 10 in which the orbiting scroll 30, the bush 60, etc. are assembled is heated, and the fixed scroll 20 is inserted from the upper end of the heated main shell 10. As a result, the fixed scroll 20 is shrink-fitted to the main shell 10. At this time, the engaging portion 22 is engaged with the phase determining groove 121 to determine the position of the fixed scroll 20 in the circumferential direction, and in that state, the fixed scroll 20 is moved to the second inner wall 120 and the third inner wall of the main shell 10. The first substrate 21 is pushed into the step between the first substrate 21 and the step 130. In this specification, since the fixed scroll 20 is fixed to the main shell 10 in this step, it is also called a second fixing step.

The upper shell 12 is assembled to the main shell 10 in which the fixed scroll 20 is shrink-fitted. At this stage, the scroll compressor 1 is completed, but the first substrate 21 of the fixed scroll 20 is thermally deformed by the heating condition in shrink fitting of the fixed scroll 20, and the above-mentioned first substrate 21 of the fixed scroll 20 is The distance between the orbiting scroll 30 and the addendum of the second spiral body 32 may deviate from the desired distance. Therefore, subsequently, the distance between the first substrate 21 and the tooth tip of the second spiral body 32 is adjusted using the position variable groove 44.

In the adjustment of the distance between the first substrate 21 and the addendum of the second spiral body 32 using the position variable groove 44, first, in order to adjust the main shell 10 with respect to the heating condition of shrink fitting, using the above-mentioned database. Find the heating conditions for.

Then, the main shell 10 is locally heated under the determined heating conditions of the main shell 10. As a result, the main shell 10 is thermally deformed. For example, the main shell 10 is locally heated at the heating position shown in FIG.

For example, under the obtained heating condition of the main shell 10, the heating position is the position where the engaging portion 43 of the main frame 40 engages, that is, the step between the second inner wall 120 and the third inner wall 130 of the main shell 10. If it is also above, the main shell 10 is locally heated at the heating position P1 shown in FIG. Then, it cools. As a result, the locally heated portion contracts to generate stress, and as shown in FIGS. 8 and 9, the third inner wall 130 side of the main shell 10 thermally deforms outward. As a result, the diameter of the third inner wall 130 increases. As a result, the step moves outward, and the surface of the step, that is, the upper end of the third inner wall 130, inclines downward toward the inside. At this time, the position variable groove 44 is deformed and the groove width is expanded. As a result, the engaging portion 43 follows the inclination of the step, and the position at which the engaging portion 43 engages is lowered. As a result, the distance between the first substrate 21 of the fixed scroll 20 and the addendum of the second spiral body 32 is increased by the distance L shown in FIGS. 8 and 9.

Further, when the heating position is below the step between the second inner wall 120 and the third inner wall 130 of the main shell 10 under the obtained heating condition of the main shell 10, the engaging portion 43 of the main frame 40 is engaged. The main shell 10 is locally heated at the heating position P2 shown in FIG. 7 below the mating position, and then cooled. As a result, the locally heated portion contracts to generate stress. Thereby, although not shown, the second inner wall 120 of the main shell 10 is thermally deformed outward. As a result, the diameter of the third inner wall 130 is reduced. As a result, the step moves inward, and the upper end of the third inner wall 130 inclines upward toward the inside. Also in this case, the position variable groove 44 is deformed. Unlike the above, the width of the position variable groove 44 is reduced. As a result, the engaging portion 43 follows the inclination of the step, and the position at which the engaging portion 43 engages rises. As a result, the distance between the first substrate 21 of the fixed scroll 20 and the tooth tips of the second scroll 32 is reduced.

In addition, when the heating conditions are obtained using the database, it is possible to obtain several places where local heating is performed in the circumferential direction of the main frame 40 and obtain the heating conditions for each of those places where local heating is performed. For example, a total of three local heating points are determined every 120° around the cylindrical axis of the main frame 40, and the heating amount and heating position of each local heating point, that is, the position at which the engaging portion 43 engages. A position above or below may be obtained. In this case, the distance from the position where the engaging portion 43 engages may be obtained. As a result, the inclination of the lower surface of the first substrate 21 with respect to the surface of the second spiral body 32 in contact with the tooth tips can be reduced to approach the inclination of 0°.

In this way, the heating conditions are obtained using the database, and the main frame 40 is locally heated under the obtained heating conditions. Thereby, the distance between the first substrate 21 and the tooth tips of the second spiral body 32 is adjusted. In addition, in this specification, this process is called a heating process.

As described above, in the scroll compressor 1 according to the present embodiment, the position variable groove 44 is deformed in accordance with the thermal deformation of the main shell 10, so that the position of the holding portion 42 with respect to the engaging portion 43 of the main frame 40. Can be changed. Therefore, in the scroll compressor 1, by heating the main shell 10, the main shell 10 is thermally deformed and the position of the holding portion 42 can be changed. As a result, the position of the orbiting scroll 30 held by the holding portion 42 can be changed to adjust the position of the orbiting scroll 30 with respect to the fixed scroll 20.

Further, only the position variable groove 44 of the main frame 40 is thermally deformed, and the orbiting scroll 30 itself is not thermally deformed. Therefore, the second spiral body 32 included in the orbiting scroll 30 is not thermally deformed. As a result, the compression chamber formed by the second spiral body 32 of the orbiting scroll 30 and the first spiral body 23 of the fixed scroll 20 is less likely to distort.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments. For example, in the above embodiment, the position variable groove 44 is formed in the main frame 40. However, in the present invention, the position variable groove 44 may be any position variable portion provided between the outer peripheral portion of the holding portion 42 of the main frame 40 and the engaging portion 43. Then, the position varying portion may be deformed according to the thermal deformation of the main shell 10 so that the position of the holding portion 42 with respect to the engaging portion 43 can be changed.

FIG. 10 is a cross-sectional view of a modified example of the position variable groove 44. FIG. 11 is a cross-sectional view of another modification of the position variable groove 44. In FIGS. 10 and 11, the same region of the scroll compressor 1 as in FIG. 7 is enlarged.

The position variable groove 44 may be the position variable plate 46 shown in FIG. As shown in FIG. 10, the position varying plate 46 is a connecting plate that connects the holding portion 42 and the engaging portion 43 and has a smaller vertical thickness than the holding portion 42 and the engaging portion 43. Has been formed.

Further, the position variable groove 44 may be the position variable recesses 47U and 47L shown in FIG. The position variable recesses 47U and 47L are arranged between the engaging portion 43 and the holding portion 42, as shown in FIG. The position variable recess 47U is arranged on the upper surface between the engaging portion 43 and the holding portion 42 and is recessed downward. The position variable recess 47L is arranged on the lower surface between them and is recessed upward. The position variable recesses 47U and 47L face each other in the vertical direction. Even in such a form, the main shell 10 is deformed by thermal deformation, and the position of the holding portion 42 with respect to the engaging portion 43 can be changed. In the present specification, the position variable recesses 47U and 47L are also simply referred to as recesses.

In the above-described embodiment, the main frame 40 includes the engaging portion 43 that engages with the step of the inner wall formed in the main shell 10. However, the present invention is not limited to this. In the present invention, the main frame 40 may include a fixing portion that fixes the holding portion 42 to the inner wall of the main shell 10. For example, the main frame 40 may include a welding portion that fixes the holding portion 42 to the inner wall of the main shell 10. In this case, although the positioning accuracy is poor, the steps formed by the first inner wall 110, the second inner wall 120, the third inner wall 130, etc. may not be formed in the main shell 10. That is, the inner wall of the main shell 10 may not be provided with the concave portion or the convex portion. Even in such a form, the position of the orbiting scroll 30 with respect to the fixed scroll 20 can be adjusted by using the position variable groove 44.

In the above embodiment, the main frame 40 is fixed to the main shell 10 by press fitting. However, in the present invention, the method of fixing the main frame 40 to the main shell 10 is not limited. For example, the main frame 40 may be shrink-fitted to the main shell 10. It may also be welded.

DESCRIPTION OF SYMBOLS 1 scroll compressor, 10 main shell, 11 suction pipe, 12 upper shell, 13 lower shell, 14 discharge pipe, 15 fixed base, 20 fixed scroll, 21 first substrate, 22 engaging part, 23 first spiral body, 30 shaking Dynamic scroll, 31 second substrate, 32 second spiral body, 33 cylindrical portion, 40 main frame, 41 bearing portion, 42 holding portion, 43 engaging portion, 44 position variable groove, 45 chamfered portion, 46 position variable plate, 47U , 47L position variable recess, 50 Oldham ring, 51, 52 key part, 60 bush, 70 crankshaft, 71 eccentric part, 72 main shaft part, 80 drive mechanism, 81 rotor, 82 stator, 90 subframe, 91 bearing, 110th 1 inner wall, 120 2nd inner wall, 121 phasing groove, 130 3rd inner wall, 140 4th inner wall, 310 key groove, 421 small cylindrical space, 422 large cylindrical space, 423 key groove, 424 outer peripheral portion, 425 engagement Part, D, L distance, P1, P2 heating position, θ inclination.

Claims (6)

A tubular shell,
A fixed scroll housed in the shell and fixed to the inner wall of the shell,
A holding part that holds the orbiting scroll swingably with respect to the fixed scroll, a fixing part that fixes the holding part to the inner wall, and a heat of the shell that is provided between the holding part and the fixing part. A frame having a position changing part capable of changing the position of the holding part with respect to the fixing part by deforming according to the deformation,
Scroll compressor equipped with. The position variable portion has a recess formed between the holding portion and the fixed portion,
The scroll compressor according to claim 1. The fixing portion is a protrusion protruding from the holding portion toward the inner wall of the shell,
The protrusion has a chamfer on the side of the protruding tip and on the side where the fixed scroll is located,
The scroll compressor according to claim 1. A method for assembling the scroll compressor according to any one of claims 1 to 3, comprising:
A first fixing step of housing the frame in the shell and fixing the frame to the shell;
A second fixing step of housing the fixed scroll in the shell and fixing the fixed scroll to the shell by heat treatment,
After the second fixing step, by heating the shell to thermally deform the shell, the heating step of deforming the position varying portion to change the position of the holding portion with respect to the fixing portion,
And a method for assembling a scroll compressor. In the heating step, a part of the shell on the side where the fixed scroll is located than a part where the fixed portion of the inner wall is present is heated.
The method for assembling the scroll compressor according to claim 4. In the heating step, a portion of the shell on the side opposite to the side on which the fixed scroll is located is heated, relative to the portion where the fixed portion of the inner wall is present,
The method for assembling the scroll compressor according to claim 4 or 5.

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