JP2005201168A - Scroll compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a scroll compressor capable of reducing a deformation amount in an inner diametrical direction generated in a closed vessel by welding as much as possible and of successfully performing centering of a main frame, by considering positional relationship among arc-spot welding parts, a seam part of the closed vessel and a relief by a notch of the main frame with respect to the seam part. <P>SOLUTION: A compression part comprising a fixed scroll, a turning scroll and the main frame 9 and an electric motor driving the compression part are arranged inside the closed vessel comprising a cylindrical body part 2 to which the seam part S is jointed and a cover sealing a cylindrical opening part of the body 2. The notch 12 is provided in a position in the axial direction of the main frame 9 opposing to the seam part S, and the main frame 9 is spot-welded to the body 2. Ribs 13 projecting in the axial direction are provided at intermediate points among a plurality of spot-welded parts W1 to W4 of the main frame 9 so as to oppose to the electric motor side, and the notch 12 is arranged in a position other than the positions of the spot-welded parts W1 to W4 and the ribs 13. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a scroll compressor, and more specifically, by considering the positional relationship between the position of arc spot welding, the seam portion (seam) of the sealed container, and the relief due to the notch of the main frame relative thereto, The present invention relates to an apparatus in which the amount of deformation in the inner diameter direction generated in a sealed container by welding is made as small as possible to improve the centering of the main frame.

  As shown in FIGS. 4 and 5, this type of conventional scroll compressor is provided with a compression portion 32 and an electric motor 33 in a sealed container 31, and the compression portion 32 has a fixed scroll 34 and a turning scroll 35. A compression chamber is provided in which suction gas is compressed as it goes to the center of each lap, and the main frame 36 that supports both scrolls, the shaft 37 that drives the orbiting scroll 35, and the rotation of the orbiting scroll 35 are prevented. An Oldham ring 38 is provided. Further, a sub frame 39 is provided on the opposite side of the main frame 36, and the other end of the shaft 37 is pivotally supported.

In order to secure the axial center of the main frame 36 and the subframe 39, there is a method shown in FIG.
The assembled product of the main frame 36 and the shaft is inserted into the sealed container 31 and placed on the jig base D. At this time, a slight gap is provided between the main frame 36 and the sealed container 31. Next, a plurality of gap gauges are inserted into the air gap between the stator 33a and the rotor 33b of the electric motor 33, the axial center of the main frame 36 is kept good, and arc spot welding W is performed. At this time, due to welding distortion, the sealed container 31 is deformed as indicated by a dotted line M in FIG.

In the outer diameter of the main frame 36, a relief by the notch 40 with respect to the seam portion S 'of the sealed container 31 is formed, but the seam portion S' is provided at the midpoint between the welds W on the circumference of the sealed container 31. In this case, the relief is arranged in a region (45 °) where the sealed container 31 is displaced to the innermost side,
The amount of deformation in the inner diameter direction of the sealed container 31 at the notch 40 is further increased. If the amount of deformation of the sealed container 31 is large, the axis of the main frame 36 cannot be secured satisfactorily. As a result, one-side contact occurs in each bearing portion, and the performance and reliability of the compressor may be reduced.

Moreover, there exists a thing as shown in FIG. 7 as what is known conventionally (for example, refer patent document 1).
There are three spot welding positions W of the upper bearing 21 as a support member for fixing the compression mechanism portion to the inner wall surface of the body 11a of the closed container in the circumferential direction. It exists between the low-rigidity area A and another low-rigidity area A. The low-rigidity region A is formed by providing three oil through holes 21a that serve as through holes of the upper bearing 21 at regular intervals along the circumferential direction.
By configuring as described above, the welded portion of the sealed container body 11a is pulled after spot welding, and the inner surface side of the sealed container body 11a between the welding position is raised, and the outer diameter of the support member of the compression mechanism section Even if they interfere with each other, the deformation can be absorbed in the low-rigidity region, so that the strain on the entire compression mechanism portion can be alleviated.
However, the above method does not consider the centering of the main frame in the case of a seam-structured body and assembly.

JP 2001-182681 A (page 4, effect of the invention, FIG. 3)

  In the present invention, in view of the above problems, welding takes place in the sealed container by considering the positional relationship between the position of arc spot welding, the seam portion of the sealed container, and the clearance due to the notch of the main frame relative thereto. An object of the present invention is to provide a scroll compressor capable of reducing the amount of deformation in the inner diameter direction as much as possible and improving the centering of the main frame.

In order to solve the above-described problems, the present invention provides a fixed scroll, a turning scroll, and a main frame in a sealed container including a cylindrical body joined with a seam portion and a lid that seals a cylindrical opening of the body. And a motor for driving the compression part, a notch facing the seam part is provided on the outer periphery of the main frame, and the main frame is fixed to the body by a plurality of spot welds. A scroll compressor,
A rib that protrudes in the axial direction is provided between the plurality of spot welds of the main frame so as to face the electric motor side, and the notch is disposed at a place other than the spot weld and the rib. It becomes the composition which becomes.

  The rib is provided at the midpoint of the spot weld.

  Further, the main frame is configured to be press-fitted into the body.

  Further, the ribs are formed in a radial shape, the same diameter portion connecting the outer diameter of the rib to the outer peripheral surface of the main frame, the small diameter portion where the tip side of the rib is smaller in diameter than the same diameter portion, and the same diameter portion And an inclined portion connected to the small diameter portion.

  According to the scroll compressor of the present invention, the inner diameter generated in the sealed container by welding is considered by considering the positional relationship between the position of arc spot welding, the seam portion of the sealed container, and the escape (notch) of the main frame with respect to the position. The scroll compressor can reduce the amount of deformation in the direction as much as possible and improve the centering of the main frame.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail as examples based on the attached drawings.

1 is a cross-sectional view of a scroll compressor showing an embodiment of the present invention, FIG. 2A is a cross-sectional view taken along the line aa of FIG. 1, FIG. 2B is an enlarged cross-sectional view of the main part of the main frame, and FIG. FIG. 3A is a perspective view showing a seam portion of the sealed container body, and FIG. 3B is a perspective view of a main part for explaining a rib of the main frame.
In FIG. 1, reference numeral 1 denotes an airtight container. The airtight container 1 is open at the top and bottom, and has a cylindrical body 2 in which a seam portion (joint) is joined by welding, and a dish that closes the upper opening of the body 2. And a dish-like lower lid 3b for closing the lower opening of the body 2.

  A compression unit 4 that compresses the refrigerant up and down and an electric motor 5 that drives the compression unit 4 are disposed in the hermetic container 1, and the compression unit 4 includes a swirl-shaped fixed scroll 6 and the fixed unit. A orbiting scroll 7 that forms a plurality of compression chambers by meshing a lap with the scroll 6, a shaft 8 that transmits the rotational force of the electric motor 5 to the compression portion 4, and a main shaft that supports the main shaft at the tip of the shaft 8. A subframe 10 that includes a bearing, is composed of a revolving scroll 7 and a main frame 9 that meshes with a lap to fix the fixed scroll 6, further supports a lower frame 10 of the shaft 8, and an Oldham ring that prevents the revolving scroll 7 from rotating. 11 and the scroll compressor is configured.

  As shown in FIG. 3A, the cylindrical body 2 of the closed container 1 is formed by bending a plate-like member by machining and joining a seam portion (joint) S by welding W ′. Is done.

  The seam portion S may have protrusions such as burrs on the inner surface side of the body 2 due to variations during welding. For this reason, as shown in FIG. A relief by a concave notch 12 is provided at an axial position of the outer peripheral surface of the frame 9. The main frame 9 is a hole provided on the circumference of the body 2 and is joined by a plurality of arc spot welds W1, W2, W3, W4.

  As shown in FIGS. 2 (A) and 2 (B), a plurality of projections projecting in the axial direction so as to face the electric motor 5 at intermediate points between the plurality of arc spot welds W1 to W2 of the main frame 9. The rib 13 is integrally provided on the main frame 9. On the other hand, the notch 12 is arranged at a position that does not interfere with the welding distortion at the midpoint between the arc spot welds W1 and W2. In this example, the notch 12 is arranged at a substantially middle point between the rib 13 between the arc spot welds W1 and W2 and the arc spot weld W1.

  In this way, the notch 12 does not interfere with the welding distortion at the most apex (45 ° with respect to W1) of the deformation in the inner diameter direction of the body 2 caused by arc spot welding, and the deformation in the inner diameter direction of the body 2 is performed. The outermost arc of the main frame 9 is always at the most apex. In addition, since the rib 13 is provided at the highest vertex of the deformation in the inner diameter direction of the body 2, the main frame 9 is reinforced. As a result, the amount of deformation of the notch 12 in the inner diameter direction of the body 2 is made as small as possible, and deterioration of the axial misalignment that occurs in the main frame 9 due to welding is prevented. For example, when there is a notch 12 at the midpoint between arc spot welds W1 to W2, the amount of deformation in the inner diameter direction of the body 2 of the notch 12 is larger than the other three midpoints, and the opposite side of the notch 12 Thus, the main frame 9 is pushed out and the axial misalignment is deteriorated.

  Further, by adopting a configuration in which the main frame 9 is press-fitted into the body 2, the centering of the main frame 9 can be improved, and the assembly accuracy can be improved.

  The notch 12 has a minimum size that can prevent interference between the seam portion S and the main frame 9, and the width of the notch 12 in the outer circumferential direction is 10 to the total inner circumferential length of the body 2. It is desirable to make it about 15%. At the same time, the notch 12 communicates the discharge chamber and the motor chamber and is also used as a gas passage.

  Further, the rib 13 is formed in a radial shape, and the outer diameter of the rib 13 is connected to the outer peripheral surface 9a of the main frame 9, and the small-diameter portion in which the tip side of the rib 13 is smaller in diameter than the same-diameter portion 13a. The press-fitting property of the main frame 9 to the body 2 can be improved by including the inclined portion 13c continuous with the same-diameter portion 13a and the small-diameter portion 13b.

  As described above, by taking into account the positional relationship between the position of arc spot welding, the seam portion of the sealed container, and the escape (notch) of the main frame with respect to it, the deformation in the inner diameter direction that occurs in the sealed container by welding The scroll compressor can reduce the amount as much as possible and improve the centering of the main frame.

It is sectional drawing of the scroll compressor which shows the Example of this invention. (A) is an aa arrow directional view of FIG. 1, (B) is a principal part expanded sectional view of a main frame. (A) is a perspective view which shows the seam part of an airtight container trunk | body, (B) is a principal part perspective view explaining the rib of a main frame. It is sectional drawing of the scroll compressor in a prior art example. It is a bb arrow line view of Drawing 4 in a conventional example. It is sectional drawing for demonstrating the welding method of the main frame in a prior art example. It is principal part sectional drawing in another prior art example.

Explanation of symbols

1 Airtight container 2 Body
3a Upper lid
3b Lower lid body 4 Compression section 5 Electric motor 6 Fixed scroll 7 Orbiting scroll 8 Shaft 9 Main frame
9a Outer surface
10 subframes
11 Oldham Ring
12 Notch
13 ribs
13a Same diameter part
13b Small diameter part
13c Inclined part S Seam part (joint)
W, W1, W2, W3, W4, W 'Arc spot welding (spot welding)

Claims (4)

In a sealed container composed of a cylindrical body having a seam part and a lid body that seals both ends of the body, a compression part comprising a fixed scroll, a turning scroll and a main frame, and an electric motor for driving the compression part A scroll compressor in which a notch facing the seam portion is provided on the outer periphery of the main frame, and the main frame is fixed to the body by a plurality of spot welds.
A rib that protrudes in the axial direction is provided between the plurality of spot welds of the main frame so as to face the electric motor side, and the notch is disposed at a place other than the spot weld and the rib. A scroll compressor characterized by comprising The scroll compressor according to claim 1, wherein the rib is provided at a midpoint of the spot welded portion. The scroll compressor according to claim 1, wherein the main frame is press-fitted into the body. The rib is formed in a radial shape, the same diameter portion connecting the outer diameter of the rib to the outer peripheral surface of the main frame, the small diameter portion whose tip side is smaller than the same diameter portion, the same diameter portion and the 2. The scroll compressor according to claim 1, wherein the scroll compressor is composed of an inclined portion continuous with the small diameter portion.

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