JP2003065255A - Scroll compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a scroll compressor with high reliability which prevents degradation of performance caused by deformation of a fixed scroll. SOLUTION: The scroll compressor S comprises a scroll compressing element 2 in a closed container 1, a motor driving element 3 for driving the scroll compressing element 2, and a support frame 4 having in the center thereof a bearing portion 6 for journaling a rotary shaft 5 of the motor driving element 3. The closed container 1 is provided with a body 1A and an end cap 1B welded to be fixed on the body 1A in a position corresponding to a side of the fixed scroll 7. On a side surface of the fixed scroll 7 in the position corresponding to a welding portion (a welding part 74) between the end cap 1B and the body 1A, a recessed depression portion 11C is formed in a direction separated away from the closed container 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll compressor that engages with a fixed scroll and an orbiting scroll to perform compression.

[0002]

2. Description of the Related Art A conventional general scroll compressor includes an electric element having a rotary shaft in a hermetic container, an orbiting scroll driven by the electric element and having a spiral wrap standing on an end plate. A scroll compression element including a fixed scroll in which a spiral wrap is erected on an end plate that faces and engages with the orbiting scroll is housed. Then, the orbiting scroll is orbited while revolving so that it does not rotate with respect to the fixed scroll, so that the plurality of compression spaces formed between the wraps of the fixed scroll and the orbiting scroll gradually move from the outside to the inside. It was configured to reduce and compress.

12 and 13 show enlarged views of a fixed scroll 107 portion of a conventional scroll compressor of this type. The sealed container 101 of the scroll compressor includes a cylindrical main body 101A for accommodating an electric element (not shown) and a scroll compression element (only the fixed scroll 107 is shown), and a main body 101A at a position corresponding to the side of the fixed scroll 107. It is composed of a bowl-shaped end cap 101B which covers the side opening and is welded and fixed at its peripheral edge (FIG. 12).
Shows the state before welding). This fixed scroll 107
The side surface of the end plate 101 has a stepped shape including a large diameter portion 111A fixed to the inner surface of the end cap 101B by, for example, shrink fitting, and a small diameter portion 111B extending from the large diameter portion 111A to the support frame 104 side. ing.

The edge of the main body 101A enters between the small diameter portion 111B of the fixed scroll 107 and the end cap 101B. Then, the end plate 111 of the fixed scroll 107
The fixed scroll 107 and the support frame 104 by connecting the fixed scroll 107 to the support frame 104 and inserting the screw 136 into the screw hole 133 formed in the end plate 111 and screwing the screw 136 into the support frame 104. As a result, the end surface of the small diameter portion 111B of the fixed scroll 107 is attached to the support frame 1
The fixed scroll 1 in close contact with the contact point 104A of 04
Ensuring a seal between 07 and the support frame 104.

Then, the peripheral portion of the end cap 101B and the main body 101A are fixed by welding. FIG. 13 shows after welding. Further, 174 in FIG. 13 is a welded portion.

[0006]

However, when the peripheral portion of the end cap 101B and the main body 101A are fixed by welding, the main body 101A bulges and deforms inward due to the influence of heat during the welding. This bulge is shown at 176 in FIG.
Therefore, the small-diameter portion 111B of the end plate 111 of the fixed scroll 107 located inside the main body 101A is deformed by the bulging portion 176 to generate distortion, which causes
There arise problems such as deterioration of performance, breakage of teeth due to hitting of the scroll portion, and failure to secure the sealing property of the contact portion 104A between the fixed scroll 107 and the support frame 104.

The present invention has been made in order to solve the above-mentioned conventional technical problems, and an object thereof is to provide a highly reliable scroll compressor by preventing performance deterioration due to distortion of a fixed scroll. To do.

[0008]

SUMMARY OF THE INVENTION A scroll compressor according to the present invention includes a scroll compression element in an airtight container, an electric element for driving the scroll compression element, and a center for pivotally supporting a rotary shaft of the electric element. A support frame having a bearing portion is provided, and a scroll compression element is provided with a spiral wrap standing on the surface of the end plate, and a fixed scroll fixed in contact with the support frame and a fixed scroll supported by the support frame. In contrast, a plurality of compression spaces formed by orbiting by driving an electric element and having a spiral wrap erected on one surface of an end plate are provided, and a plurality of compression spaces formed by meshing both wraps with each other It is compressed by gradually shrinking from the inside to the inside, and the closed container is welded to the main body at the position corresponding to the side of the main body and the fixed scroll. And a cap to be fixed, to the side of the fixed scroll at a position corresponding to the welding points between the cap and the body, characterized in that the recess which is recessed in a direction away from the closed container is formed.

The scroll compressor according to a second aspect of the present invention is characterized in that, in the above description, the recessed portion is formed at a position other than the contact portion between the fixed scroll and the support frame.

The scroll compressor according to a third aspect of the present invention is characterized in that, in each of the above aspects, the recessed portion is sufficiently separated from the screw hole for fixing the fixed scroll and the support frame.

According to the present invention, a scroll compression element, an electric element for driving the scroll compression element, and a support frame having a bearing portion for pivotally supporting the rotating shaft of the electric element in the center are provided in the closed container. The scroll compression element is provided with a spiral wrap erected on the surface of the end plate, and is fixed to the fixed scroll by abutting against the support frame. And a plurality of compression spaces formed by meshing both wraps with each other are gradually reduced from the outer side to the inner side. In a scroll compressor that performs compression by means of the above-mentioned method, the closed container is a cap that is welded and fixed to the main body at the position corresponding to the side of the fixed scroll. Since the side surface of the fixed scroll at a position corresponding to the welding position between the cap and the main body is formed with a recessed portion that is recessed in the direction away from the closed container, when welding the cap to the main body, Even if the body of the closed container is deformed inward by the heat of and swells,
The bulging portion can be accommodated in the concave portion without contacting the side surface of the fixed scroll to absorb the deformation.

As a result, the fixed scroll is distorted due to the deformation of the main body due to the heat effect due to the welding of the main body of the closed container and the cap, the performance is degraded, the wrap is damaged, or the sealing property between the supporting frame and the supporting frame is deteriorated. It is possible to prevent the performance deterioration due to.

According to the second aspect of the present invention, in addition to the above, since the recessed portion is formed at a position other than the contact portion between the fixed scroll and the support frame, the fixed scroll is deformed due to the deformation of the main body of the hermetic container. While preventing the occurrence of distortion, maintaining the area of contact between the fixed scroll and the support frame,
The sealability between the fixed scroll and the support frame can be reliably maintained.

According to the invention of claim 3, in addition to each of the above inventions, the concave portion is sufficiently separated from the screw hole for fixing the fixed scroll and the support frame, so that the fixing strength of the fixed scroll is high. The inconvenience of being lowered can also be prevented. This makes it possible to provide a highly reliable scroll compressor.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings. 1 is a vertical cross-sectional side view of a scroll compressor S to which the present invention is applied (a cross section taken along line AA in FIG. 2), FIG. 2 is a partially cutaway top view of the scroll compressor S of FIG. 1, and FIG. 1 is a vertical side view of the scroll compressor S excluding the end cap 1B and the bottom cap 1C of FIG.
4 is a top view of the scroll compressor S of FIG. 3, and FIG. 5 is FIG.
6 is a front view of the terminal T portion of the scroll compressor S of FIG. 6, FIG. 6 is a top view of the scroll compressor S from FIG. 4, and FIG. 7 is a vertical cross-sectional side view of the scroll compression element 2 of the scroll compressor S of FIG. 8 is a bottom view of the scroll compression element 2 of FIG. 7, and FIG. 9 is a vertical cross-sectional side view of the electric element 3 and the support frame 4 of the scroll compressor S of FIG.

In each drawing, reference numeral 1 denotes a closed container, which is a cylindrical main body 1A and bowl-shaped caps (end cap 1B and bottom cap 1C) welded and fixed to both upper and lower ends of the main body 1A. ) And is composed of. Then, in the airtight container 1, the scroll compression element 2 is housed on the upper side, and the electric element 3 for driving the scroll compression element 2 is housed on the lower side.
A closed container 1 between the scroll compression element 2 and the electric element 3
A support frame 4 is housed therein, and a bearing portion 6 that pivotally supports a rotating shaft 5 is formed at the center of the support frame 4 so as to project downward.

The scroll compression element 2 is composed of a fixed scroll 7 and an orbiting scroll 8. The fixed scroll 7 has an end cap 1B around the closed container 1
Shrink-fit on the inner surface of the
In the closed container 1, the high pressure chamber 9 and the low pressure chamber 1
A disk-shaped end plate 11 that divides into 0 and an involute shape that is erected on one surface (lower surface) of the end plate 11,
Or, a spiral wrap 1 consisting of a curve that approximates this
3 and 3. At the center of the end plate 11 of the fixed scroll 7, the discharge hole 1 communicating with the high pressure chamber 9 in the closed container 1 is formed.
4 are formed. The fixed scroll 7 has the wrap 13 protruding downward.

The orbiting scroll 8 has a disk-shaped end plate 15,
A spiral wrap 16 which is erected on one surface (upper surface) of the mirror plate 15 or which is a curve similar to this, and the center of the other surface (lower surface) of the mirror plate 15. And a boss hole portion 17 formed to project. Then, the orbiting scroll 8 has the protruding direction of the wrap 16 as the upper side, and the wrap 16 is fixed to the fixed scroll 7.
The wraps 13 are rotated 180 degrees so as to face each other and engage with each other to form a plurality of compression spaces 18 between the inner wraps 13 and 16.

Reference numeral 19 is a pin portion provided at the tip (upper end) of the rotary shaft 5 and inserted into the boss hole 17 of the orbiting scroll 8. The center of the pin portion 19 is offset from the axis of the rotary shaft 5. It is provided in mind. An Oldham ring 20 is located between the supporting frame 4 and the lower side of the orbiting scroll 8. The Oldham ring 20 has a pair of keys 21 and 21 formed to project upward at opposite positions, and a pair of key grooves 22 formed to be opposite to each other at positions 90 degrees apart from the keys 21 and 21. , 22 are included.

On the other hand, a pair of key grooves 23, 23 are formed in the peripheral portion of the other surface (lower surface) of the orbiting scroll 8, and the key 21 of the Oldham ring 20 is formed in the key grooves 23, 23. , 21 are slidably engaged. In addition, a pair of key members 2 having a substantially L-shaped cross section are provided on the peripheral portion of the fixed scroll 7.
4 and 24 project downward and are screwed, and the key members 24 and 24 are key grooves 22 of the Oldham ring 20,
22 is slidably engaged. At this time, the key member 24,
Reference numeral 24 projects downward from a thrust bearing surface 26 of the support frame 4 described later. Due to this engagement relationship, the Oldham ring 20 revolves around the circular orbit so that the orbiting scroll 8 does not rotate with respect to the fixed scroll 7.

The thrust bearing surface 26 for supporting the orbiting scroll 8 is formed in the central portion of the support frame 4, and the outer side of the thrust bearing surface 26 is inward from the peripheral portion at a position displaced by 90 degrees. Are cut out at four locations toward the mounting bowl 2 protruding outwardly and downwardly from the thrust bearing surface 26 by these four notches 27 ...
8 ... are formed with their positions shifted by 90 degrees. Two screw holes 29 are formed on each of the upper surfaces of the peripheral portions of the mounting bowls 28 ... Further, pin holes 32, 32 for inserting the positioning pin 31 are formed between the screw holes 29, 29 of the pair of mounting bowls 28, 28 facing each other.

The mounting bowl 28 of the support frame 4
.., that is, the outer diameter of the support frame 4 is the closed container 1
It is set to be smaller than the inner diameter of the main body 1A.

On the other hand, a total of eight screw holes 33 are formed in the peripheral edge portion of the end plate 11 of the fixed scroll 7 at positions corresponding to the screw holes 29 ... Pin holes 34, 34 are formed at positions corresponding to the pin holes 32, 32 on the peripheral portion of the surface (lower surface), respectively. Then, with the positioning pin 31 inserted into the pair of pin holes 32 and 34, the screw 36 is inserted into the screw hole 33, ... And screwed into the screw hole 29 of the support frame 4. By
The fixed scroll 7 is fixed to the support frame 4. As a result, the support frame 4 is fixed to the end cap 1B of the closed container 1 via the fixed scroll 7.

On the other hand, the electric element 3 is composed of a stator (stator) 38 and a rotor 39 rotating in the stator 38, and the rotary shaft 5 is fitted to the center of the rotor 39. And forms a part of the rotor 39. A crank portion 41 pivotally supported by the bearing portion 6 of the support frame 4 is formed below the pin portion 19 at the tip of the rotary shaft 5, and the lower portion of the rotary shaft 5 (below the rotor 39) is a sub bearing. 42 is pivotally supported. This sub bearing 42 is the main body 1A of the closed container 1.
It is pressed into the inner surface.

The auxiliary bearing 42 is formed with a plurality of screw holes 43 penetrating therethrough, and the stator 38 of the electric element 3 is also formed with through holes 44 at positions corresponding to the screw holes 43.
Further, screw holes 46 are formed on the lower surfaces of the mounting bowls 28 ... Of the support frame 4 at positions corresponding to the through holes 44. Then, the screw 47 is inserted into the screw hole 43 of the auxiliary bearing 42, penetrates the through hole 44 of the stator 38, and is screwed into the screw hole 46 of the support frame 4, whereby the auxiliary bearing 42, the electric element 3, and the support are supported. It is integrated with the frame 4, and the electric element 3 and the support frame 4 are fixed to the main body 1A of the closed container 1 via the sub bearing 42.

The body 1A of the closed container 1 is provided with a flat seat pressing portion 49 having a shape as shown in FIG. The seat pusher 49 is configured by pushing the main body 1A inward from the outside, and the terminal T connected to the electric element 3 is attached to the seat pusher 49. The seat pressing portion 49 needs to be positioned above the electric element 3 at the height (side) of the support frame 4, but as shown in FIG. 6, the seat pressing portion 49 is located in the notch 27 of the support frame 4. The support frame 4 is attached so as to be located.

On the other hand, the key member 24 of the fixed scroll 7,
24 is positioned in the notches 27, 27 at a position displaced by 90 degrees from the notch 27 in which the seat pressing portion 49 is located, that is, approximately 90 degrees with the seat pressing portion 49 to which the terminal T is attached. The key member 2 of the scroll 7 fixed at the displaced position
The fixed scroll 7, the orbiting scroll 8, and the Oldham ring 20 are arranged so that the numerals 4 and 24 are positioned.

The key member 2 of the fixed scroll 7 as described above.
Since the reference numerals 4 and 24 project below the thrust bearing surface 26 of the support frame 4, when the key member 24 is located in the direction of the terminal T, the key member 24 and the terminal T interfere with each other. Although it is necessary to increase the position of the scroll compression element 2 to increase the size of the scroll compressor S, since the key member 24 and the terminal T are displaced by about 90 degrees as described above, such interference occurs. Therefore, it becomes possible to prevent the dimensional expansion.

When the seat pressing portion 49 is pushed, the main body 1A
However, since the outer diameter of the support frame 4 is set to be smaller than the inner diameter of the main body 1A of the closed container 1 as described above, the support frame 4 is deformed even when inserted into the main body 1A. The support frame 4 is pressed by the main body 1A, and the risk of distortion is eliminated.

Reference numeral 51 denotes a suction pipe attached to the lower portion of the main body 1A of the closed container 1, and this suction pipe 51 communicates with the low pressure chamber 10 in the closed container 1 below the electric element 3. 52
Is a discharge pipe attached to the end cap 1B of the closed container 1, and the discharge pipe 52 is a high pressure chamber 9 in the closed container 1.
Is in communication with. The cutouts 27 ... Of the support frame 4 serve as passages for guiding the refrigerant from the low pressure chamber 10 to the scroll compression element 2.

Reference numerals 54 and 56 denote balancers (balance weights) attached to the rotary shaft 5 of the rotor 39 of the electric element 3 by shrink fitting or press fitting, and the balancer 5 on the upper side.
4 is attached to the rotating shaft 5 above the coil end at the upper end of the rotor 39 at a position symmetrical to the pin portion 19 with respect to the axis of the rotating shaft 5, and the lower balancer 56 rotates on the same side as the pin portion 19. It is attached to the rotary shaft 5 between the coil end at the lower end of the child 39 and the sub bearing 42.

In particular, the upper balancer 54 includes the rotor 39
Of the bearing frame 6 of the support frame 4 and the outer diameter of the stator 39 is larger than the outer diameter of the rotor 39 above the coil end of the stator 39. The upper portion is located on the outer circumference of the bearing portion 6 of the support frame 4. As a result, the balancer 5
The center of gravity (indicated by arrow R in FIG. 9) of the eccentric portion of 4 is moved upward and brought close to the orbiting scroll 8 to be positioned on the outer periphery of the bearing portion 6. As a result, the balancer 54 is lightened, and the generation of vibration due to the eccentric movement of the pin portion 19 is effectively eliminated. Further, the flexure of the rotary shaft 5 is reduced, and the disadvantage that the crank portion 41 hits the bearing portion 6 one-sided can be suppressed.

Next, 61 is an end plate 11 of the fixed scroll 7.
Is a discharge valve attached to the other surface (the upper surface opposite to the wrap 13). This discharge valve 61 is used for the end plate 1
A frame body 63 having a substantially gate-shaped cross-section attached by screws 62, 62 corresponding to one discharge hole 14, and a moving space portion 64 formed in the frame body 63 so as to open laterally and downward. And a disc-shaped valve body 66 that is vertically movable. The center of the valve element 66 coincides with the center of the discharge hole 14. A contact surface 67 is formed on the upper surface of the moving space 64 of the frame 63.

Further, a total of two first and second communication passages 68, 69 are formed through the upper wall of the frame 63, and the lower ends of the communication passages 68, 69 are opened at the contact surface 67. However, the upper end is open to the high pressure chamber 9. Both the communication passages 68, 69 extend in the vertical direction, and the first communication passage 68 is open at the contact surface 67 at a portion corresponding to a position deviated from the center of the valve body 66. On the other hand, the second communication passage 69 is located at a position corresponding to the lower center of the end cap 1B.
A through hole 71 is formed at the center of B. Reference numeral 72 is a pipe in which a temperature sensing unit (not shown) is incorporated, which is inserted into the second communication passage 69, and the pipe 72 passes through the through hole 71 and is drawn to the outside. Then, when the discharge temperature (discharge refrigerant temperature) detected by the temperature sensing unit of the temperature detection device reaches a predetermined abnormal high temperature, the electric element 3 is stopped by the control device (not shown), and the scroll compressor S is stopped due to the abnormal high temperature. Avoid the inconvenience of damage.

Here, the end plate 11 of the fixed scroll 7
As shown in FIG. 10, the peripheral side surface of the large-diameter portion 11A is fitted around the inner surface of the end cap 1B of the closed container 1 by shrinkage,
It has a step structure including a small diameter portion 11B inserted inside the main body 1A. Then, an abutting portion 11D that abuts and abuts on the abutting portion 4A of the support frame 4 is formed on the end surface of the small diameter portion 11B (end surface on the support frame 4 side).

Further, the closed container 1 is provided on the peripheral surface of the small diameter portion 11B at a position slightly separated from the large diameter portion 11A side of the contact portion 11D.
The recessed portion 1 slightly recessed in the direction away from the main body 1A of the
1C is formed. The recessed portion 11C is a state in which the fixed scroll 7 is shrink fitted to the end cap 1B,
It is formed corresponding to the inside of the position where the end of the end cap 1B and the main body 1A overlap. That is, the recessed portion 11C
Is a contact point 4A between the fixed scroll 7 and the support frame 4.
The concave portion 11C is provided between the abutment portion 11D and the large diameter portion 11A at positions other than the end cap 1B.
Is formed at a position corresponding to a welded and fixed portion between the main body 1A and the main body 1A.

The recessed portion 11C is formed by the fixed scroll 7
It is provided at a sufficient distance from the screw hole 33 for fixing the support frame 4 and the support frame 4. Incidentally, FIG. 10 and FIG.
In FIG. 1, the space between the recessed portion 11C and the screw 36 is shown thin, but in reality, it is made thick and has sufficient strength.

Next, the procedure for assembling the scroll compressor S of the present invention will be described. First, the rotary shaft 5 is fitted to the rotor 39 of the electric element 3, and the balancers 54 and 56 are attached to the rotary shaft 5 by press fitting or shrink fitting to be assembled. Then, the stator 38 of the electric element 3 is placed on the sub bearing 42, and the through hole 44 is aligned with the screw hole 43. Next, the rotor 3 in which the rotary shaft 5 and the balancers 54 and 56 are assembled
9 is inserted into the stator 38, and the lower portion of the rotary shaft 5 is attached to the auxiliary bearing 4
2 is pivoted. Next, the support frame 4 is covered on the stator 38, the screw holes 46 are aligned with the through holes 44, and the crank portion 41 of the rotary shaft 5 is inserted into the bearing portion 6 to be pivotally supported. Then, as described above, the screw 47 is inserted from the side of the auxiliary bearing 42 in the order of the screw hole 43, the through hole 44, and the screw hole 46, and finally screwed into the screw hole 46, whereby the support frame 4 and the electric element 3 are connected. And the sub bearing 42 is assembled in advance and integrated. This is the state shown in FIG.

On the other hand, the fixed scroll 7 is placed with the wrap 13 facing upward, and the orbiting scroll 8 with the wrap 16 facing downward is put on the fixed scroll 7 to engage the wraps 13 and 16. Next, attach the Oldham ring 20 to the keys 21 and 21.
On the orbiting scroll 8 with the key 21
21 is engaged in the key grooves 23, 23 of the orbiting scroll 8. Next, the keys 21 and 21 and the key grooves 23 and 23
The key member 2 on the fixed scroll 7 at a position deviated by 90 degrees
4, 24 are screwed and engaged in the respective key grooves 22, 22 in a state of protruding above the Oldham ring 20.
In this way, the scroll compression element 2 as shown in FIG.
Assemble.

Next, as shown in FIG. 9, the support frame 4, the electric element 3 and the auxiliary bearing 42 are assembled in advance, and the main body 1A of the closed container 1 is covered from above, and the whole body is inserted into the main body 1A.
The sub bearing 42 is press-fitted and fixed to the inner surface of the main body 1A. Next, the positioning pins 31 and 31 are inserted into the pin holes 32 and 32 of the support frame 4 as described above. Next, the scroll compression element 2 preassembled as shown in FIG. 7 is placed on the main body 1A with the Oldham ring 20 side facing down, and the positioning pin 31,
31 is inserted into the pin holes 34, 34 of the fixed scroll 7, and the screw holes 33 ... Are screw holes 29.
.. and the pin portion 19 of the rotary shaft 5 is engaged with the boss hole portion 17 of the orbiting scroll 8. Then, as described above, the screw 36 is screwed from the fixed scroll 7 side to the screw hole 33 ...
, And is screwed into the screw holes 29 of the support frame 4 to be fixed. Then, the discharge valve 61 is made to correspond to the discharge hole 14 of the end plate 11 of the fixed scroll 7, and the screws 62, 62
It is fixed to the end plate 11 at
Plug in. This state is the state shown in FIG.

Next, the end cap 1B is shrink-fitted around the end plate 11 of the fixed scroll 7, and a high and low pressure seal is applied to cover the main body 1A.
The pipe 72 standing up as described above is inserted into the through hole 71 of the end cap 1B, and then the end cap 1B is shrink-fitted to the end plate 11 to cover the main body 1A. At this time, since the communication passage 69 is located at the position corresponding to the center of the end cap 1B as described above, the pipe 72 also corresponds to the center of the end cap 1B, and the end cap 1B is attached to the main body 1A while being inserted into the through hole 71. By covering, the end cap 1B is positioned with respect to the main body 1A, and the assembling becomes easy. Further, the restriction on the rotation direction at the time of shrink fitting is relaxed.

Thus, the end plate 11 of the fixed scroll 7
After the end of the end cap 1B is shrink-fitted onto the inner surface of the end cap 1B and the main body 1A is covered with the end cap 1B,
The periphery of B is welded and fixed to the main body 1A. At this time, in the small-diameter portion 11B of the end plate 11 of the fixed scroll 7, the main body 1 corresponds to the welding portion between the end cap 1B and the main body 1A.
Since the recessed portion 11C recessed in the direction away from A is formed, when the end cap 1B is welded to the main body 1A, the heat of the welding deforms the main body 1A inward and even if the main cap 1B swells, the deformed expansion As shown in FIG. 11, the projecting portion 76 fits within the recessed portion 11C without contacting the small diameter portion 11B. As a result, the bulging portion 76 is absorbed in the recessed portion 11C, so that the end plate 11 of the fixed scroll 7 is not distorted. Therefore, the sealing property between the contact portion 11D of the end plate 11 of the fixed scroll 7 and the contact portion 4A of the support frame 4 is ensured. In FIG. 11, 74 is a welded portion. Then, the bottom cap 1C is covered on the lower end of the main body 1A, and the periphery is welded and fixed.

Next, another pipe is attached to the closed container 1 to complete the scroll compressor S. In this state, from the top, the scroll compression element 2, the support frame 4, the electric element 3
The sub-bearing 42 and the sub-bearing 42 are integrated, and are held in the closed container 1 at two points, that is, a shrink-fitting portion around the end plate 11 of the fixed scroll 7 and a press-fitting portion of the sub-bearing 42.

Next, the operation of the scroll compressor S of the present invention will be described. When the rotor 39 of the electric element 3 is rotated by the power supply from the terminal T, the rotational force is transmitted to the orbiting scroll 8 via the rotary shaft 5.

That is, the orbiting scroll 8 is driven by the boss hole 17 which is inserted into the pin portion 19 of the rotary shaft 5 in an eccentric manner with respect to the axis of the rotary shaft 5, and the Oldham ring 20 drives the fixed scroll 7 against the fixed scroll 7. Can be revolved in a circular orbit so that it does not rotate. Then, the fixed scroll 7 and the orbiting scroll 8 gradually reduce the compression space 18 formed between these wraps 13 and 16 from the outside to the inside, and from the suction pipe 51 to the low pressure chamber in the closed container 1. The refrigerant flowing into the flow path 10 and passing through the electric element 3 and the cutouts 27 of the support frame 4 is compressed.

The compressed refrigerant is discharged from the discharge hole 14 of the fixed scroll 7 into the high pressure chamber 9, but the valve body 66 of the discharge valve 61 is lifted by the high pressure refrigerant discharged from the lower discharge hole 14. The discharge hole 14 is opened apart from the discharge hole 14 and is brought into close contact with the contact surface 67. Discharge hole 1
The refrigerant discharged from No. 4 enters the high-pressure chamber 9 through the side opening of the moving space 64, is discharged from the discharge pipe 52 to the outside of the closed container 1 and discards the cooling action, and then is sucked again from the suction pipe 51. repeat.

As described above, in the present invention, the concave portion 11C is formed on the peripheral side surface of the small diameter portion 11B of the end plate 11 of the fixed scroll 7 at the position corresponding to the welded portion 74 where the end portion of the end cap 1B is welded to the main body 1A. Is forming. Since the recessed portion 11C is recessed in the direction away from the closed container 1, when the end portion of the end cap 1B is welded to the main body 1A, the heat of the welding deforms the main body 1A of the closed container 1 inward. Even when it bulges out, the expanded bulging portion 76 can be absorbed in the recessed portion 11C without coming into contact with the small diameter portion 11B. As a result, it is possible to prevent the fixed scroll 7 from being distorted and the performance of the scroll compressor S from deteriorating due to the influence of heat generated by welding and fixing the end cap 1B.

Further, the concave portion 11 is provided at a position other than the contact portion 11D of the fixed scroll 7 and the contact portion 4A of the support frame 4.
Since C is formed, the contact area between the fixed scroll 7 and the support frame 4 is also maintained, and the sealing property is maintained as good.

Further, the fixed scroll 7 and the support frame 4
Since the distance from the screw hole 33 for fixing and to the recessed portion 11C is sufficiently separated, it is possible to reliably prevent the attachment strength between the fixed scroll 7 and the support frame 4 from decreasing. As a result, the reliability of the scroll compressor S can be maintained.

[0050]

As described in detail above, according to the present invention, a scroll compression element, an electric element for driving the scroll compression element, and a bearing for pivotally supporting the rotary shaft of the electric element in the center are provided. And a fixed scroll having a spiral compression wrap erected on the surface of the end plate and fixed in contact with the support frame and a fixed scroll supported by the support frame. On the other hand, a plurality of compression spaces formed by revolving by the drive of the electric element and having an orbiting scroll in which a spiral wrap is erected on one surface of the end plate are formed. In a scroll compressor that performs compression by gradually reducing it toward the inside,
The closed container includes a main body and a cap welded and fixed to the main body at a position corresponding to the side of the fixed scroll, and a hermetically sealed side surface of the fixed scroll at a position corresponding to a welding position between the cap and the main body. Since the recessed part that is recessed in the direction away from the container is formed, even when the body of the closed container is deformed inward due to the heat of welding when the cap is welded to the body, the bulging part is fixed The deformation can be accommodated in the recess without contacting the side surface of the scroll.

As a result, the fixed scroll is distorted due to the deformation of the main body due to the heat effect due to the welding of the main body of the closed container and the cap, the performance is degraded, the wrap is damaged, or the sealing property between the supporting frame and the supporting frame is deteriorated. It is possible to prevent the performance deterioration due to.

According to the second aspect of the present invention, in addition to the above, the recessed portion is formed at a position other than the contact portion between the fixed scroll and the support frame. While preventing the occurrence of distortion, maintaining the area of contact between the fixed scroll and the support frame,
The sealability between the fixed scroll and the support frame can be reliably maintained.

According to the invention of claim 3, in addition to each of the above inventions, the concave portion is sufficiently separated from the screw hole for fixing the fixed scroll and the support frame, so that the fixed scroll has a mounting strength. The inconvenience of being lowered can also be prevented. This makes it possible to provide a highly reliable scroll compressor.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional side view of a scroll compressor to which the present invention is applied (cross section taken along the line AA in FIG. 2).

2 is a partially cutaway top view of the scroll compressor of FIG. 1. FIG.

FIG. 3 is a vertical sectional side view of the scroll compressor of FIG. 1 excluding an end cap and a bottom cap of a closed container.

FIG. 4 is a top view of the scroll compressor of FIG.

5 is a front view of a terminal portion of the scroll compressor shown in FIG. 1. FIG.

6 is a top view of FIG. 4 with the scroll compression element removed.

7 is a longitudinal side view of a scroll compression element of the scroll compressor of FIG.

8 is a bottom view of the scroll compression element of FIG. 7. FIG.

9 is a vertical side view of an electric element and a support frame of the scroll compressor of FIG. 1. FIG.

10 is an enlarged vertical cross-sectional side view of the fixed scroll portion before welding and fixing the main body of the closed container and the end cap of the scroll compressor of FIG.

11 is an enlarged vertical cross-sectional side view of a fixed scroll portion in which the main body of the closed container and the end cap of the scroll compressor of FIG. 10 are fixed by welding.

FIG. 12 is an enlarged vertical side view of the fixed scroll portion before welding and fixing the main body of the closed container and the end cap of the conventional scroll compressor.

13 is an enlarged vertical cross-sectional side view of a fixed scroll portion in a state where a main body of an airtight container and an end cap of the scroll compressor of FIG. 12 are fixed by welding.

[Explanation of symbols]

1 closed container 1A body 1B end cap 1C bottom cap 2 scroll compression element 3 electric elements 4 Support frame 4A contact point 5 rotation axes 6 Bearing 7 fixed scroll 8 swing scroll 11 End plate 11A large diameter part 11B Small diameter part 11C recess 11D contact part 13 laps 15 End plate 16 laps 18 compression space 20 Oldham Ring 33 screw holes 36 screws 74 Weld 76 bulge S scroll compressor

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor registration             2-5-3 Keihan Hondori, Moriguchi City, Osaka Prefecture             Within Yo Denki Co., Ltd. F term (reference) 3H029 AA02 AA14 AB03 BB31 BB32                       BB44 CC03 CC07 CC09 CC17                 3H039 AA03 AA04 AA12 BB05 BB07                       BB08 CC03 CC08 CC09 CC33

Claims (3)

[Claims] 1. A scroll compression element, an electric element for driving the scroll compression element, and a support frame having a bearing portion for supporting a rotation shaft of the electric element in the center are provided in a hermetic container. The scroll compression element includes a fixed scroll in which a spiral wrap is erected on a surface of an end plate and is fixed in contact with the support frame, and a drive of the electric element with respect to the fixed scroll supported by the support frame. And an orbiting scroll in which a spiral wrap is erected on one surface of the end plate. In a scroll compressor that performs compression by gradually reducing, the closed container is at a position corresponding to a side of the main body and the fixed scroll. A cap that is welded and fixed to the body, and a recessed portion that is recessed in a direction away from the closed container is formed on a side surface of the fixed scroll at a position corresponding to a welding position between the cap and the main body. Scroll compressor characterized by. 2. The scroll compressor according to claim 1, wherein the recessed portion is formed at a position other than a contact portion between the fixed scroll and the support frame. 3. The scroll compressor according to claim 1, wherein the recessed portion is sufficiently separated from a screw hole for fixing the fixed scroll and the support frame.