JP6583210B2 - Compressor welding method and compressor manufacturing method - Google Patents

Description

The present invention relates to a compressor welding method and a compressor manufacturing method .

  Conventionally, as a compressor welding method, there is one disclosed in JP-A-2015-197046 (Patent Document 1).

  In this conventional compressor welding method, the end plate fixed to the upper end of the cylinder of the compression mechanism and the sealed container are attached to three first welds arranged at equal intervals in the circumferential direction in the first welding step. In the second welding step, the end plate and the sealed container were simultaneously welded at three second welds arranged at equal intervals in the circumferential direction. And the heat input amount for each of the three first welds in the first welding step is equal to the heat input amount for each of the three second welds in the second welding step.

Japanese Patent Laying-Open No. 2015-197046

  However, in the conventional compressor welding method, the amount of heat input to each of the three first welds in the first welding step and the amount of heat input to each of the three second welds in the subsequent second welding step. In the first welding process, the closed container shrinks in the circumferential direction, the average inner diameter shrinks, and the gap between the end plate and the sealed container is smaller than before the first welding process. In the second welding step, each of the second welds is welded with the same heat input as in the first welding step. Therefore, in the second welding process, the force with which the sealed container presses the end plate inward becomes excessive, and excessive distortion occurs in the end plate and the high pressure compressed gas in the cylinder leaks to the low pressure side. There is a problem that efficiency decreases.

  In the so-called round cylinder type compressor, the closed container and the cylinder of the compression mechanism are connected by three first welds in the first welding process, and three second welds in the second welding process. There is a significant problem when connecting with the network as described below.

  As shown in FIG. 7, a cylinder 500 having a bore portion 501 and a bush hole portion 502 is disposed in the sealed container 600 (for the sake of clarity, the interval between the inner peripheral surface of the sealed container 600 and the outer peripheral surface of the cylinder 500). Then, as shown in FIG. 8, in the first welding process, the closed container 600 and the cylinder are formed by three first welds 701, 701, and 701 arranged at a phase of 120 °. 500 is welded by spot welding or the like. Then, the sealed container 600 contracts in the circumferential direction as indicated by arrows P1 and P1 in FIG. 8, and the average inner diameter contracts as indicated by arrows R1, R1, and R1, and is indicated by a solid line from the state indicated by the broken line. It becomes a state. Thereafter, as shown in FIG. 9, the sealed container 600 and the cylinder 500 are welded by the three second welding portions 702, 702, 702 arranged in a phase of 120 °. At this time, the amount of heat input (welding power) of each of the three first welds 701, 701, 701 in the first welding process and the three second welds 702, 702, 702 in the second welding process. The amount of heat input (welding power) is the same.

  Therefore, in the second welding process, the welded portion contracts in the first welding process and the gap between the sealed container 600 and the cylinder 500 is smaller as shown in FIG. 8 than before the first welding process. The second welds 702, 702, and 702 are welded with the same heat input (welding power) as in one welding process. Therefore, as indicated by arrows R2, R2, and R2 in FIG. 9, the forces R2, R2, and R2 that push the cylinder 500 inward become excessive, and the forces R2, R2, and R2 are applied to the bore portion 501 and the bush hole portion. The force 502 is transmitted to 502 as force C and B, and a large distortion may occur in the bore portion 501 and the bush hole portion 502 to cause mechanical lock and noise.

Therefore, an object of the present invention is to prevent excessive distortion of the compression mechanism portion, for example, to prevent excessive distortion of the end plate, the bore portion of the cylinder, the bush hole portion, etc. It is an object of the present invention to provide a compressor welding method and a compressor manufacturing method capable of preventing noise generation.

In order to solve the above problem, a welding method for a compressor according to the present invention is as follows.
An arrangement step of arranging the compression mechanism in the sealed container;
A first welding step of simultaneously welding the closed container and the compression mechanism part with a plurality of first welds arranged in the circumferential direction;
After the first welding step, the airtight container and the compression mechanism portion are arranged in the circumferential direction and welded simultaneously at a plurality of second welding portions positioned between the plurality of first welding portions. A second welding step to perform,
The amount of heat input to each of the plurality of second welds in the second welding step is smaller than the amount of heat input to each of the plurality of first welds in the first welding step.

  According to the welding method of the compressor having the above-described configuration, the heat input amount to each of the plurality of first welded portions in the first welding step is larger than the heat input amount to each of the plurality of second welded portions in the subsequent second welding step. Since the amount of heat input is small, it is possible to prevent excessive distortion of the compression mechanism section, and to prevent volumetric efficiency reduction, mechanical lock, and noise. More specifically, the plurality of the second welding steps after the sealed container is contracted by the welding of the plurality of first welded portions in the first welding step and the gap between the sealed container and the compression mechanism portion is reduced. Since the amount of heat input to each of the second welded portions is smaller than the amount of heat input to each of the plurality of first welded portions in the first welding step, the compression mechanism portion is excessively distorted by welding of the second welded portion. This eliminates the decrease in volumetric efficiency, mechanical lock and noise.

  Note that the amount of heat input (welding power) to the welded portion can be easily obtained by resistance × welding such as spot welding according to current × voltage × energization time, that is, watt hours. The same applies to arc welding.

In one embodiment,
The upper written heat amount of the second welded portion is 60% or more and less than 100% of the upper written heat amount of the first welded portion.

  As described above, when the upper written heat amount of the second welded portion is 60% or more and less than 100% of the upper written heat amount of the first welded portion, the compression mechanism portion is sufficiently secured while ensuring the bonding strength by welding. The generation of excessive distortion can be prevented.

In one embodiment,
The plurality of first welded portions and the plurality of second welded portions are welded to a bore portion where a piston of the compression mechanism portion moves, a cylinder having a bush hole portion, and the sealed container.

  In the said embodiment, even if it welds the cylinder which has the bore part which the piston of the said compression mechanism part moves, a bush hole part, and the said airtight container, the amount of heat input of a 2nd weld part rather than the amount of heat inputs of a said 1st weld part. Since the amount of heat input is reduced, it is possible to prevent excessive distortion of the bore portion and the bush hole portion of the cylinder, thereby preventing the occurrence of mechanical lock and noise.

  When the cylinder itself is welded to a sealed container as in the case of a so-called round cylinder type compressor, large distortion due to welding is likely to occur in the bore portion and bush hole portion of the cylinder, but the amount of heat input from the first welded portion is larger. Since the heat input amount of the second welded portion is reduced, excessive distortion does not occur in the bore portion and the bush hole portion of the cylinder.

In one embodiment,
The plurality of first welded portions welds the solid portion of the cylinder of the compression mechanism portion and the sealed container, and the plurality of second welded portions are hollow portions of the cylinder of the compression mechanism portion. And the sealed container are welded.

  In general, the welding of the second welded portion after the welding of the first welded portion is likely to cause distortion by the cylinder.

  However, in this embodiment, since the second welded portion welds the hollow portion of the cylinder and the sealed container, the hollow portion absorbs the force applied to the cylinder by the welding of the second welded portion. Thus, distortion of the bore portion and bush hole portion of the cylinder can be reduced.

  Further, in the above embodiment, since the solid portion of the cylinder of the compression mechanism portion and the sealed container are welded at the first weld portion having a heat input amount larger than the heat input amount of the second weld portion, The compression mechanism and the cylinder can be firmly joined.

In one embodiment,
The plurality of first welded portions welds a solid portion of an end plate that closes an opening of a cylinder of the compression mechanism portion and the sealed container, and the plurality of second welded portions are connected to the compression mechanism portion. The hollow part of the end plate and the closed container are welded.

  According to the embodiment, since the solid portion of the end plate of the compression mechanism portion and the sealed container are welded by the first weld portion having a larger heat input than the second weld portion, the compression mechanism The joining strength between the end plate of the part and the sealed container can be increased.

  Moreover, since the hollow part of the end plate of the said compression mechanism part and the said airtight container are welded by the 2nd weld part whose heat input is smaller than the said 1st weld part, the said 2nd weld part is the said hollow part. The distortion at the time of welding is absorbed, the distortion of the end face is suppressed, the leakage of the high-pressure compressed gas in the cylinder to the low-pressure side can be prevented, and the decrease in volume efficiency can be prevented.

The manufacturing method of the compressor of this invention is
A sealed container;
A compression mechanism disposed in the sealed container;
While welding the airtight container and the compression mechanism part, a plurality of first welding parts arranged in the circumferential direction,
Welding the closed container and the compression mechanism, and a plurality of second welds positioned between the plurality of first welds,
Each of the plurality of second welds has a compressor manufacturing method for manufacturing a compressor smaller than each of the plurality of first welds .
The plurality of second welds are formed after welding the plurality of first welds .

According to the manufacturing method of the compressor having the above configuration, each dimension of the plurality of second welded portions is smaller than each dimension of the plurality of first welded portions. Therefore, after welding the first welded portion, By welding the second welded portion, distortion due to welding of the compression mechanism portion can be reduced, and for example, reduction in volumetric efficiency, mechanical lock, and generation of noise can be prevented.

  In this specification, the dimension of the welded portion means the average diameter or area of traces caused by welding (when the welded portion extends in the longitudinal direction). For example, in the case of resistance welding such as spot welding, nugget Means Nugget Diameter.

In one embodiment,
The plurality of first welded portions and the plurality of second welded portions are welded to a bore portion where a piston of the compression mechanism portion moves, a cylinder having a bush hole portion, and the sealed container.

  According to the above embodiment, the first welded portion and the second welded portion weld the bore portion to which the piston of the compression mechanism portion moves, the cylinder having the bush hole portion, and the sealed container. Since the dimension of the second welded part is made smaller than the dimension of the first welded part, the second welded part is welded after the first welded part, whereby the bore part and the bush hole part of the cylinder are Excessive distortion can be prevented, and mechanical lock and noise can be prevented.

In one embodiment,
The plurality of first welds welds the solid part of the cylinder and the sealed container, and the plurality of second welds welds the hollow part of the cylinder and the sealed container. .

  According to the embodiment, since the dimension of the second welded part is smaller than the dimension of the first welded part, in addition to the relatively small welding distortion due to the second welded part, the second welded part is Since the hollow portion of the cylinder and the sealed container are welded, the hollow portion absorbs the force applied to the cylinder by the welding of the second welded portion, and the distortion of the bore portion and the bush hole portion of the cylinder is absorbed. Can be reduced.

  Moreover, in the said embodiment, since the 1st welding part which has a dimension larger than the dimension of the said 2nd welding part welds the solid part and the said airtight container of the said cylinder of the said compression mechanism part, The sealed container and the cylinder can be firmly joined.

In one embodiment,
The plurality of first welds welds a solid part of an end plate that closes an opening of a cylinder of the compression mechanism part and the sealed container, and the plurality of second weld parts are formed of the compression mechanism part. The hollow part of the end plate and the closed container are welded.

  According to the embodiment, since the solid portion of the end plate of the compression mechanism portion and the sealed container are welded by the first weld portion having a size larger than the size of the second weld portion, The joint strength between the end plate of the compression mechanism and the sealed container can be increased.

  Moreover, since the hollow part of the end plate of the said compression mechanism part and the said airtight container are welded by the 2nd weld part which has a dimension smaller than the dimension of the said 1st weld part, it is 2nd welding in the said hollow part. It is possible to absorb distortion at the time of welding of the portion, suppress distortion of the end face, prevent leakage of high-pressure compressed gas in the cylinder to the low pressure side, and prevent a decrease in volumetric efficiency.

  According to the present invention, it is possible to prevent excessive distortion of the compression mechanism portion, for example, to prevent excessive distortion of the end plate, the bore portion of the cylinder, the bush hole portion, etc. Generation etc. can be prevented.

It is a longitudinal cross-sectional view of the compressor of 1st Embodiment of this invention. It is a cross-sectional view of the cylinder and piston of the compressor of the first embodiment. It is a cross-sectional view for demonstrating the welding part of the airtight container and cylinder of the compressor of the said 1st Embodiment. It is a graph which shows the relationship between a heat input and a nugget diameter. It is a longitudinal cross-sectional view of the compressor of 2nd Embodiment of this invention. It is a cross-sectional view for demonstrating the welding part of the airtight container and end plate of the compressor of the said 2nd Embodiment. It is a cross-sectional view explaining the welding part of the airtight container and cylinder of a compressor for demonstrating the subject of this invention. It is a cross-sectional view explaining the welding part of the airtight container and cylinder of a compressor for demonstrating the subject of this invention. It is a cross-sectional view explaining the welding part of the airtight container and cylinder of a compressor for demonstrating the subject of this invention.

  Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments.

(First embodiment)
As shown in FIG. 1, the compressor of the first embodiment is a so-called high-pressure dome type rotary compressor, in which a compression mechanism portion 2 is placed down and a motor 3 is placed up in an airtight container 1. ing. The compression mechanism 2 is driven by the motor 3.

  The motor 3 includes a stator core 5 made of laminated electromagnetic steel sheets, a coil 6 wound around each tooth portion of the stator core 5, a rotor core 7 made of laminated electromagnetic steel sheets, and a plurality of magnets 8 embedded in the rotor core 7. And have. The stator core 5 is fixed to the inner peripheral surface of the sealed container 1 by shrink fitting. One end of the rotating shaft 10 is fixed to the center hole of the rotor core 7.

  On the other hand, the compression mechanism portion 2 includes a so-called round type cylinder 20, an upper end plate 23 and a lower end plate 24 fixed to the cylinder 20 so as to close the bore portion 21 of the cylinder 20, and the bore A piston 25 that revolves within the portion 21 and an eccentric portion 15 of the rotating shaft 10 that is rotatably fitted in a through hole of the piston 25 are included. Further, as shown in FIG. 2, the compression mechanism section 2 has a substantially semi-cylindrical shape that supports both surfaces of a blade section 25b projecting in a radial direction from the cylindrical main body section 25a of the piston 25 so as to be swingable and movable back and forth. Shaped bushes 26, 26 are included. The bushes 26 and 26 rotate slidably within the bush hole 22 of the cylinder 20.

  As shown in FIG. 1, the other end portion of the rotating shaft 10 is rotatably supported by boss portions 23a and 24a of the upper and lower end plates 23 and 24, respectively. When the rotating shaft 10 is driven by the motor 3, the body portion 25 a of the piston 25 revolves along the peripheral surface of the bore portion 21 while moving the blade portion 25 b forward and backward by the movement of the eccentric portion 15 of the rotating shaft 10. The refrigerant gas sucked into the bore portion 21 from the suction port 31 is compressed, and the compressed high-pressure refrigerant gas is discharged into the muffler cover 32 from a discharge port and a discharge valve (not shown). It is discharged from the inside into the sealed container 1 outside the muffler cover 32 through a port (not shown). The high-pressure compressed gas in the hermetic container 1 is discharged through an outlet pipe 33 to an external refrigerant circuit (not shown).

  In FIG. 1, 34 is an accumulator, and 35 is a suction pipe that connects the accumulator 34 and the suction port 31. Reference numeral 36 denotes an oil reservoir located at the lower part in the sealed container 1.

  On the other hand, the sealed container 1 and the cylinder 20 of the compression mechanism section 2 are fixed by resistance welding such as spot welding as shown in FIG. In FIG. 3, the piston 25, the bushes 26 and 26, the rotating shaft 10 and the like shown in FIG. 2 are omitted for easy understanding.

  In detail, as shown in FIG. 3, the said airtight container 1 and the cylinder 20 are joined by three 1st welding parts 41,41,41 arrange | positioned in the phase of 120 degrees, Furthermore, the said airtight container 1 and The cylinder 20 is joined by three second welds 42, 42, 42 located between the first welds 41, 41, 41 and arranged at a phase of 120 °.

  The dimension of the second welds 42, 42, 42, that is, the nugget diameter is smaller than the dimension of the first welds 41, 41, 41, that is, the nugget diameter. The nugget diameters of the first welded portion 41 and the second welded portion 42 can be easily adjusted as shown in FIG. 4 by controlling the heat input (welding power) during the welding. As can be seen from FIG. 4, the nugget diameter increases as the heat input increases.

  As shown in FIG. 4, the nugget diameter of the second welded portion 42 is 73% or more and less than 100% of the nugget diameter of the first welded portion 41. At this time, the heat input amount of the second welded portion 42 is 60% or more and less than 100% of the heat input amount of the first welded portion 41, as shown in FIG.

  When resistance welding such as spot welding is performed as in the first embodiment, a general nugget diameter is used as the dimension of the welded portion. However, as a dimension of the welded part, a dimension in a broad sense may be used. For example, in the case of arc welding or the like, the average diameter, area (when the welded part extends in the longitudinal direction), depth of penetration, etc. May be used.

  Further, as shown in FIG. 3, the first welds 41, 41, 41 weld the solid parts 51, 51, 51 of the cylinder 20 and the sealed container 1, and the second welds 42. , 42 and 42 weld the hollow portion 52 of the cylinder 20 and the sealed container 1. The solid portion 51 of the cylinder 20 refers to a portion where the space between the outer peripheral surface of the cylinder 20 and the bore portion 21 is solid and there is no through hole. On the other hand, the hollow portion 52 of the cylinder 20 refers to a portion in which through holes 54, 55, 56 for oil passage are formed between the outer peripheral surface of the cylinder 20 and the bore portion 21.

  According to the compressor having the above-described configuration, the gap between the sealed container and the cylinder 20 has already been reduced by the welding of the first welding parts 41, 41, 41 before the second welding parts 42, 42, 42 are welded. However, since the nugget diameter of the second welded portions 42, 42, 42 is 73% or more and less than 100% of the nugget diameter of the first welded portions 41, 41, 41, the second welded portions 42, 42, 42. The amount of heat input (welding power) can be made smaller than the welding power of the first welds 41, 41, 41.

  Therefore, as shown in FIG. 3, the forces C and B applied to the bore portion 21 and the bush hole portion 22 of the cylinder 20 can be reduced by welding the second weld portions 42, 42, and 42. Excessive distortion of the bore portion 21 and the bush hole portion 22 can be prevented, and the occurrence of mechanical lock and noise can be prevented.

  Further, since the nugget diameter of the second welded portions 42, 42, 42 is smaller than the nugget diameter of the first welded portions 41, 41, 41, the welding distortion caused by the second welded portions 42, 42, 42 is relatively small. In addition, since the second welded portions 42, 42, 42 weld the hollow portions 52, 52, 52 of the cylinder 20 and the sealed container 1, the second welded portions are formed by the hollow portions 52, 52, 52. The force applied to the cylinder 20 can be absorbed by welding of the 42, 42, and 42, and the distortion of the bore portion 21 and the bush hole portion 22 of the cylinder 20 can be reduced.

  The first welds 41, 41, 41 having a larger nugget diameter than the second welds 42, 42, 42 are connected to the solid parts 51, 51, 51 of the cylinder 20 and the sealed container 1. Since welding is performed, the sealed container 1 and the cylinder 20 can be firmly joined.

  Next, the welding method for the compressor of the first embodiment will be described.

  First, as shown in FIGS. 1 and 3, an arrangement step of arranging the compression mechanism portion 2 in the sealed container 1 is performed.

  Next, as shown in FIG. 3, the sealed container 1 and the cylinder 20 of the compression mechanism unit 2 are simultaneously spot welded by three first welds 41, 41, 41 arranged at a phase of 120 °. A first welding process for performing resistance welding is performed. In the first welding step, the solid portions 51, 51, 51 of the cylinder 20 and the sealed container 1 are welded by the first welding portions 41, 41, 41.

  Next, after the first welding step, three second welds in which the sealed container 1 and the cylinder 20 are positioned between the first welds 41, 41, 41 and arranged in a phase of 120 °. A second welding process for performing resistance welding such as spot welding is performed simultaneously at the portions 42, 42, 42. In the second welding step, the hollow portion 52 of the cylinder 20 and the sealed container 1 are welded by the second welding portions 42, 42, 42.

  As shown in FIG. 4, the heat input amount of each second welded portion 42, 42, 42 in this second welding process is 60% or more and less than 100% of the heat input amount of each first welded portion 41, 41, 41. is there.

  More specifically, the welding distortion decreases as the heat input amount of the second welded portion 42 decreases to 95% or less, 90% or less, 85%, or 80% or less of the heat input amount of the first welded portion 41. On the other hand, it is preferable from the viewpoint of reducing distortion, and on the other hand, the larger the heat input amount of the first welded portion 41 is 65% or more, 70% or more, 75% or more, the more preferable from the viewpoint of the bonding strength. Therefore, the heat input amount of the second welded portion 42 is not limited to less than 100% of the heat input amount of the first welded portion 41, and may be 95% or less, 90% or less, 85%, 80% or less, for example. The heat input amount of the first welded portion 41 may be 65% or more, 70% or more, or 75% or more.

According to the compressor welding method having the above-described configuration, the gap between the sealed container 1 and the cylinder 20 is already welded by the first welds 41, 41, 41 before the second welds 42, 42, 42 are welded. However, since the heat input amount of the second welded portions 42, 42, 42 is 60% or more and less than 100% of the heat input amount of the first welded portions 41, 41, 41,
As shown in FIG. 3, the forces C and B applied to the bore portion 21 and the bush hole portion 22 of the cylinder 20 can be reduced by welding the second weld portions 42, 42, 42, and the bore portion 21 of the cylinder 20 can be reduced. In addition, excessive distortion of the bush hole 22 can be prevented, and mechanical lock and noise can be prevented.

  Further, since the second welded portions 42, 42, 42 weld the hollow portions 52, 52, 52 of the cylinder 20 and the sealed container 1, the second welded portions 42 are formed by the hollow portions 52, 52, 52. , 42, 42 can absorb the force applied to the cylinder 20, and the distortion of the bore portion 21 and the bush hole portion 22 of the cylinder 20 can be reduced.

  On the other hand, the first welding parts 41, 41, 41 having a larger heat input (welding power) than the second welding parts 42, 42, 42 include the solid parts 51, 51, 51 of the sealed container 1 and the cylinder 20. Since welding is performed, the sealed container 1 and the cylinder 20 can be firmly joined.

  In the first embodiment, the number of the first welded portions 41, 41, 41 and the number of the second welded portions 42, 42, 42 is three.

  In the first embodiment, the first welding portion 41 welds the sealed container 1 and the solid portion 51 of the cylinder 20, and the second welding portion 42 welds the sealed container 1 and the hollow portion 52 of the cylinder 20. However, the first welded portion may be welded to the hollow portion or solid portion of the cylinder, and the second welded portion may be welded to the hollow portion or solid portion of the cylinder.

(Second Embodiment)
FIG. 5 is a longitudinal sectional view of a compressor according to a second embodiment of the present invention, and FIG. 6 is a cross section for explaining a welded portion between the sealed container and the upper end plate of the compressor according to the second embodiment. FIG.

  The compressor of the second embodiment is different from the compressor of Patent Document 1 (Japanese Patent Laid-Open No. 2015-197046) only in the configuration of the welded portion, and the other configurations are the same, so the focus is on the welded portion. In addition, it will be described below.

  As shown in FIG. 5, the compression mechanism portion 102 is disposed below and the motor 103 is disposed above in the sealed container 100, and the compression mechanism portion 102 is driven by the motor 103 via the rotation shaft 110. Yes.

  The compression mechanism 102 includes first and second cylinders 121 and 122, an upper end plate 131, an intermediate end plate 132, a lower end plate 133, a first piston 141, and a second piston 142.

  The upper end plate 131 that closes the opening of the first cylinder 121 and the sealed container 100 are fixed by resistance welding such as spot welding as shown in FIG. The sealed container 100 and the end plate 131 are joined by three first welds 201, 201, 201 arranged in a phase of 120 °, and the sealed container 1 and the end plate 131 are joined by first welding. They are joined by three second welds 202, 202, 202 located between the parts 201, 201, 201 and arranged at a phase of 120 °.

  The nugget diameter of the second welded portions 202, 202, 202 is smaller than the nugget diameter of the first welded portions 201, 201, 201. The nugget diameters of the first welded portion 201 and the second welded portion 202 can be easily adjusted as shown in FIG. 4 by controlling the heat input (welding power) during the welding.

  The nugget diameter of the second welded portion 202 is 73% or more and less than 100% of the nugget diameter of the first welded portion 201, as shown in FIG. At this time, the heat input amount of the second welded portion 202 is 60% or more and less than 100% of the heat input amount of the first welded portion 201, as shown in FIG.

  The first welds 201, 201, 201 weld the solid portions 151, 151, 151 of the end plate 131 and the sealed container 100, and the second welds 202, 202, 202 are The hollow portions 152, 152, 152 of the end plate 131 and the sealed container 100 are welded. The hollow portion 152 is located outside the through hole 156 for oil passage or the like.

  According to the compressor having the above-described configuration, the gap between the sealed container 100 and the end plate 131 is already reduced by the welding of the first welding parts 201, 201, 201 before the second welding parts 202, 202, 202 are welded. Even so, since the nugget diameter of the second welds 202, 202, 202 is 73% or more and less than 100% of the nugget diameter of the first welds 201, 201, 201, the second welds 202, 202, The amount of heat input (welding power) 202 can be made smaller than the welding power of the first welds 201, 201, 201.

  Therefore, by welding the sealed container 100 and the end plate 131 with the second welding portion 202 having a small heat input, distortion of the end surface of the end plate 131 is reduced, and the high-pressure compressed gas in the first cylinder 121 is reduced. By preventing leakage to the outside, it is possible to prevent a decrease in volumetric efficiency.

  Further, the hollow portion 152 of the end plate 131 and the sealed container 100 are welded by the second welded portions 202, 202, 202 having a nugget diameter smaller than the nugget diameter of the first welded portions 201, 201, 201. Therefore, the hollow portion 152 absorbs distortion at the time of welding of the second welded portion 202, suppresses distortion of the end plate 131, and leaks high-pressure compressed gas in the first cylinder 121 to the low-pressure side. It is possible to prevent a decrease in volumetric efficiency.

  Further, the solid portion 151 of the end plate 131 and the sealed container 100 are welded by the first weld portions 201, 201, 201 having a nugget diameter larger than the nugget diameter of the second weld portions 202, 202, 202. Therefore, the bonding strength between the end plate 131 and the sealed container 100 can be increased.

  Next, the welding method of the compressor of this 2nd Embodiment is demonstrated.

  First, as shown in FIGS. 5 and 6, an arrangement step of arranging the compression mechanism unit 102 in the sealed container 100 is performed.

  Next, as shown in FIG. 6, the sealed container 100 and the end plate 131 of the compression mechanism unit 102 are simultaneously spot welded by three first welding parts 201, 201, 201 arranged at a phase of 120 °. The 1st welding process which performs resistance welding of etc. is performed. In the first welding step, the solid portions 151, 151, 151 of the end plate 131 and the sealed container 100 are welded by the first welding portions 201, 201, 201.

  Next, after the first welding step, the closed container 100 and the end plate 131 are positioned between the first welded portions 201, 201, 201 and are arranged in a phase of 120 °. A second welding process is performed in which resistance welding such as spot welding is simultaneously performed in the welded portions 202, 202, 202. In the second welding step, the hollow portion 152 of the end plate 131 and the sealed container 100 are welded by the second welding portions 202, 202, 202.

  As shown in FIG. 4, the heat input amount of each second welded portion 202, 202, 202 in this second welding process is 60% or more and less than 100% of the heat input amount of each first welded portion 201, 201, 201. is there.

  According to the compressor welding method configured as described above, before the second welded portions 202, 202, 202 are welded, the sealed container 100 and the end plate 131 are already welded by the first welded portions 201, 201, 201. Even if the gap is small, the heat input amount of the second welded portions 202, 202, 202 is 60% or more and less than 100% of the heat input amount of the first welded portions 201, 201, 201. This can reduce the distortion and prevent the high-pressure compressed gas in the first cylinder 121 from leaking to the outside, thereby preventing a decrease in volumetric efficiency.

  Further, the hollow portion 152 of the end plate 131 and the sealed container 100 are welded by the second welding portions 202, 202, 202 having a heat input amount smaller than the heat input amount of the first welding portions 201, 201, 201. Therefore, the hollow portion 152 absorbs distortion at the time of welding of the second welded portion 202, and further suppresses distortion of the end face of the end plate 131 to the low pressure side of the high-pressure compressed gas in the first cylinder 121. The leakage of the volumetric efficiency can be prevented to prevent the volumetric efficiency from decreasing.

  Further, the solid portion 151 of the end plate 131 and the sealed container 100 are welded by the first welding portions 201, 201, 201 having a heat input larger than the heat input of the second welding portions 202, 202, 202. Therefore, the joining strength between the end plate 131 and the sealed container 100 can be increased.

  Of course, the constituent elements described in the first and second embodiments and modifications may be combined as appropriate, and may be selected, replaced, or deleted as appropriate.

DESCRIPTION OF SYMBOLS 1,100 Airtight container 2,102 Compression mechanism part 20,121,122 Cylinder 21 Bore part 22 Bushing hole part 25 Piston 41,201 1st welding part 42,202 2nd welding part 51,151 Solid part 52,152 Hollow Part 131 End plate

Claims (9)

An arrangement step of arranging the compression mechanism (2,102) in the sealed container (1,100);
A first welding step of simultaneously welding the closed container (1,100) and the compression mechanism portion (2,102) at a plurality of first weld portions (41, 201) arranged in the circumferential direction;
After the first welding step, the closed container (1, 100) and the compression mechanism (2, 102) are arranged in the circumferential direction, and the plurality of first welds (41, 201) are arranged. A plurality of second welding portions (42, 202) positioned between the second welding step of welding simultaneously,
The amount of heat input to each of the plurality of second welds (42, 202) in the second welding step is greater than the amount of heat input to each of the plurality of first welds (41, 201) in the first welding step. A compressor welding method characterized by being small. In the compressor welding method according to claim 1,
Compressor welding method, wherein the second welding part (42, 202) has an upper writing heat quantity of 60% or more and less than 100% of the upper welding heat quantity of the first welding part (41, 201). . In the compressor welding method according to claim 1 or 2,
The plurality of first welds (41) and the plurality of second welds (42) include a bore part (21) and a bush hole part (22) where the piston (25) of the compression mechanism part (2) moves. ) And a sealed container (1) are welded together. In the compressor welding method according to claim 3,
The plurality of first welded portions (41) weld the solid portion (51) of the cylinder (20) of the compression mechanism portion (2) and the sealed container (1), and the plurality of first welded portions (41). 2. A welding method for a compressor, wherein the two welding parts (42) weld the hollow part (52) of the cylinder (20) of the compression mechanism part (2) and the sealed container (1). . In the compressor welding method according to claim 1 or 2,
The plurality of first welded portions (201) weld the solid portion (151) of the end plate (131) that closes the opening of the cylinder (121) of the compression mechanism portion (102) and the sealed container (100). The plurality of second welds (202) welds the hollow part (152) of the end plate (131) of the compression mechanism part (102) and the sealed container (100). A compressor welding method characterized by the above. An airtight container (1,100);
A compression mechanism (2,102) disposed in the sealed container (1,100);
Welding the closed container (1, 100) and the compression mechanism (2, 102), and a plurality of first welds (41, 201) arranged in the circumferential direction;
While welding the said airtight container (1,100) and the said compression mechanism part (2,102), several 2nd welding part (42,42) located between said several 1st welding part (41,201). 202)
Each of the plurality of second welds (42, 202) has a compressor manufacturing method for manufacturing a compressor smaller than each of the plurality of first welds (41, 201). There,
The method for manufacturing a compressor , wherein the plurality of second welds (42, 202) are formed after welding the plurality of first welds (41, 201) . In the manufacturing method of the compressor according to claim 6,
The plurality of first welds (41) and the plurality of second welds (42) include a bore part (21) and a bush hole part (22) where the piston (25) of the compression mechanism part (2) moves. method for producing a compressor, characterized in that it is welded to the cylinder (20) and the closed container (1) having a). In the manufacturing method of the compressor according to claim 7,
The plurality of first welds (41) weld the solid part (51) of the cylinder (20) and the sealed container (1), and the plurality of second welds (42) A method for manufacturing a compressor , wherein the hollow portion (52) of the cylinder (20) and the sealed container (1) are welded. In the manufacturing method of the compressor according to claim 6,
The plurality of first welded portions (201) weld the solid portion (151) of the end plate (131) that closes the opening of the cylinder (121) of the compression mechanism portion (102) and the sealed container (100). The plurality of second welds (202) welds the hollow part (152) of the end plate (131) of the compression mechanism part (102) and the sealed container (100). A method of manufacturing a compressor characterized by the above.

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