JP2009191765A - Hermetic compressor - Google Patents

Abstract

An object of the present invention is to provide a high-quality, hermetic compressor that is free from displacement or misalignment of a fixed portion and does not leak refrigerant, and has high productivity.
A groove is formed in at least one of a cylindrical case 102 or a lid case 103 that forms a sealed container, and a gap is formed in a fitting portion 104, so that welding fume generated when the fitting portion 104 is welded is ensured. By discharging to the outside of the fitting portion 104, it is possible to prevent the occurrence of pinholes in the welded portion 105. Therefore, it is possible to prevent leakage of refrigerant gas more reliably, and to achieve high productivity and stable quality sealed compression. Machine can be provided.
[Selection] Figure 2

Description

  The present invention relates to quality improvement of a compressor connected to a refrigeration cycle such as an electric refrigerator, an air conditioner, and a refrigeration apparatus.

  In recent years, from the viewpoint of protecting the global environment, demands for energy saving related to production as well as resource saving of products themselves are increasing, and at the manufacturing site, further improvement of productivity and quality are simultaneously achieved. Continued efforts to pursue are regarded as important.

  A conventional hermetic compressor includes a cylindrical case and a lid case produced by plastic molding of a steel plate. The cylindrical case and the lid case are fitted to each other without any gap between the mating surfaces. There exists what formed the airtight container by welding the perimeter from the outer periphery (for example, refer patent document 1).

  The prior art compressor will be described below with reference to the drawings.

  16 is a side sectional view of a conventional hermetic compressor, FIG. 17 is an enlarged sectional view of a main part of a conventional hermetic compressor, FIG. 18 is an enlarged sectional view of a main part of a conventional cylindrical case, and FIG. It is a principal part expanded sectional view of a case.

  16 to 19, the sealed container 1 is composed of a cylindrical case 2 and a lid case 3 manufactured by plastic deformation of an iron plate, and after being fitted on each other's fitting surface, is fixed by arc welding. ing.

  A compression element 4 is accommodated in the sealed container 1.

  The fitting portion of the cylindrical case 2 includes an inner diameter fitting surface 5 and an end fitting surface 6, both of which are finished to a flat surface with high surface roughness by cutting.

  The fitting part of the lid case 3 includes an outer diameter fitting surface 7 and a flange fitting surface 8, both of which are finished to a flat surface with high surface roughness by cutting.

  The fitting portion 9 between the cylindrical case 2 and the lid case 3 includes a radial press-fitting between the inner diameter fitting surface 5 and the outer diameter fitting surface 7, and an end fitting surface 6 and a flange fitting surface 8. It is formed by abutting fitting. By arc welding the entire circumference from the outer periphery to the fitting portion 9, the fitting surfaces of the cylindrical case 2 and the lid case 3 are melted and hermetically fixed.

  The operation of the conventional hermetic compressor configured as described above will be described below.

  The fitting surface of the cylindrical case 2 and the fitting surface of the lid case 3 are both finished to be flat surfaces with high surface roughness, and the fitting portion 9 has a diameter of the inner diameter fitting surface 5 and the outer diameter fitting surface 7. Since it is formed by press fitting in the direction and abutting fitting between the end fitting surface 6 and the flange fitting surface 8, there is almost no gap between the fitting portions 9 at this stage.

  When the fitting portion 9 is arc welded, molten steel is generated by melting the steel plate and the welding wire by the high heat of the arc. If this molten particle enters the sealed container 1 and adheres to the sliding part (not shown) or the movable part (not shown) of the compression element 4, it causes bad effects such as poor compression and reduced reliability. As described above, since there is almost no gap in the fitting portion 9, molten particles are prevented from passing through the fitting portion 9 and entering the sealed container 1.

Also, due to the compression work of the compression element 4, the inside of the sealed container 1 is filled with the high-temperature and high-pressure refrigerant gas 10, but since the entire circumference is hermetically fixed by arc welding, the refrigerant gas 10 leaks to the outside of the sealed container 1. Is preventing.
JP 2006-183458 A

  However, in the above-described conventional configuration, the gap between the fitting portions 9 is already finished in the previous stage of arc welding, so that the steel plate and the welding wire that touched the arc of several thousand degrees are vaporized by arc welding. The generated welding fume is also retained between the fitting portions 9 by arc welding from the outer periphery. Since the generated welding fumes are difficult to be discharged from the fitting portion 9, the welding fumes that have lost their evacuation sites may be discharged to the outside by making fine holes in the arc welding portion that has not yet solidified, and eventually the arc that has been cooled and solidified. It had the subject that it may become a pinhole in a welding part and may impair the sealing quality of the remaining welding part.

  Further, in order to detect compressors that have deteriorated the sealing quality, a gas such as nitrogen is sealed in the sealed container 1 at a high pressure with respect to all the arc welded compressors. While checking for leaks, a compressor having a deteriorated sealing quality is selected, and there is a problem that it takes a great amount of man-hours and loss costs to repair or discard the compressor.

  The present invention solves the above-described conventional problems, and provides a hermetic compressor with stable quality, high productivity, and low cost by preventing the occurrence of pinholes in the weld and reducing the number of inspection steps. The purpose is to do.

  In order to solve the above-described conventional problems, the compressor of the present invention includes a cylindrical case manufactured by plastic molding of a steel plate and a lid case manufactured by plastic molding of a steel plate, and the cylindrical case and the lid case are connected to each other. The fitting part is fitted, and the fitting part is welded from the outer periphery to the entire circumference to form a sealed container, and a slight gap is formed in a part of the contact surface of the fitting part. In order to prevent the occurrence of pinholes, it is possible to discharge molten fumes that are generated during arc welding at some contact surfaces of the metal and to discharge welding fumes through some gaps in the fitting. Can do. In addition, since pinholes can be prevented from being generated, it is possible to reduce the number of man-hours such as rework and discarded parts.

  The compressor of the present invention can prevent the occurrence of pinholes, and can reduce the number of man-hours such as rework and the reduction of waste parts. Therefore, a hermetic compressor with stable quality, high productivity and low cost can be obtained. The effect that it can provide is acquired.

  The invention according to claim 1 of the present invention includes a cylindrical case and a lid case manufactured by plastic molding of a steel plate, and the cylindrical case and the lid case are fitted to each other by a fitting portion. A sealed container is formed by welding the entire circumference from the outer periphery, and a slight gap is formed in a part of the contact surface of the fitting part, which prevents the occurrence of pinholes in the welded part and reduces the inspection man-hours. Therefore, it is possible to provide a hermetic compressor with stable quality, high productivity, and low cost.

  The invention according to claim 2 is the invention according to claim 1, wherein the gap is further formed by a spiral groove and is formed in at least one of the cylindrical case or the lid case, and the fitting portion is a protrusion of the spiral groove. Since the gap is eliminated by contact with the outer diameter of the part, the generated welding fume can be reliably produced through the inside of the spiral groove while preventing the generated molten particles from entering the sealed container, so it is more quality It is possible to provide a stable hermetic compressor.

  According to a third aspect of the present invention, the helical groove is formed by cutting in the invention of the second aspect, and the outer diameter of the convex portion of the helical groove, the depth of the helical groove, and the pitch distance. Therefore, it is possible to provide a hermetic compressor with more stable quality.

  The compressor according to claim 4 is the compressor according to claim 1, wherein the gap is formed by shaving on the end surface of the flange portion of the lid case that contacts the end surface of the cylindrical case. In the process of forming the two mating surfaces of the mating surface and the flange mating surface by shaving, a gap is formed in the mating portion with the cylindrical case by simultaneously plastically deforming the surface shape of the end surface of the flange portion. However, since two fitting surfaces and a plastically deformed surface can be formed at the same time, it is possible to provide a hermetic compressor that is more productive and inexpensive.

  The compressor according to claim 5 is the compressor according to claim 1, wherein a gap is further formed by coining on the end surface of the cylindrical case, and the shape of coining regardless of the roundness of the cylindrical case, Since the depth can be controlled to the optimum dimension, a highly productive and inexpensive hermetic compressor can be provided.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The present invention is not limited to the embodiments.

(Embodiment 1)
1 is a side cross-sectional view of a hermetic compressor according to Embodiment 1 of the present invention, FIG. 2 is an enlarged cross-sectional view of a main part of the hermetic compressor according to the same embodiment, and FIG. 4 is an enlarged cross-sectional view of the main part of the cylindrical case, FIG. 4 is an enlarged view of the main part of the lid case in the embodiment, and FIG. 5 is a welding process diagram of the hermetic compressor in the embodiment.

  1 to 5, a sealed container 101 is composed of a cylindrical case 102 and a lid case 103 manufactured by plastic deformation of an iron plate, and a fitting portion 104 formed by fitting with each other's fitting surface is as follows. The entire circumference is welded by arc welding from the outer circumference to form a welded portion 105.

  The hermetic container 101 is filled with a refrigerant gas 106 and contains a compression element 107.

  Next, the configuration of the cylindrical case 102 and the lid case 103 will be described.

  The cylindrical case 102 is formed by winding a 2.5 mm thick steel plate punched out by a press into a tubular shape, connecting joints (not shown) by high frequency welding, and ensuring roundness by tube expansion molding. The inner diameter of 108 is adjusted. At this time, the inner diameter fitting surface 108 is finished with a flat surface having high surface roughness, and the end fitting surface 109 is also finished with a flat surface having high surface roughness by press punching.

  The lid case 103 is formed by forming a steel plate having a thickness of 3 mm by press molding, forming a flange fitting surface 111 by shaving, and then forming an outer diameter fitting surface 110 by cutting. At this time, the outer diameter fitting surface 110 is finished with a flat surface with high surface roughness by cutting, and the flange fitting surface 111 is also finished with a flat surface with high surface roughness by surface pressing by shaving.

  Further, the outer diameter dimension of the outer diameter fitting surface 110 is adjusted at the time of cutting so as to be press-fitted with the inner diameter fitting surface 108 of the cylindrical case 102.

  The spiral groove 112 is formed by further cutting after the outer diameter fitting surface 110 is formed by cutting. The spiral groove 112 is formed with a groove width of 0.8 mm and a pitch distance of 1.6 mm, and the groove is formed over the entire length of the outer diameter fitting surface 110 while leaving the outer diameter fitting surface 110.

  The configuration of the fitting portion 104 formed by fitting the cylindrical case 102 and the lid case 103 formed as described above will be described.

  The fitting portion 104 is formed by a radial press-fitting between the inner diameter fitting surface 108 and the outer diameter fitting surface 110, and an abutting fitting between the end fitting surface 109 and the flange fitting surface 111. Therefore, although there is no gap in the fitting part 104, the gap by the spiral groove 112 is reliably formed therein. Further, after the fitting, the fitting portion 104 is prevented from being easily detached by the fixing force by the radial press fitting.

  Next, the process of welding and fixing the fitting portion 104 formed as described above by arc welding will be described.

  FIG. 5 shows a process from the state in which the fitting portion 104 of STEP 1 is assembled to the completion of welding fixing of STEP 4.

  In STEP 1, the lid case 103 is inserted inside the cylindrical case 102 to the innermost end where the end fitting surface 109 and the flange fitting surface 111 are in contact with each other, and the inner diameter fitting surface 108 and the outer diameter fitting surface 110 are press-fitted. It is temporarily fixed by the fixing force by fitting.

  In this state, there is no gap between the inner diameter fitting surface 108 and the outer diameter fitting surface 110 while the gap due to the spiral groove 112 formed by cutting is reliably maintained, and the end fitting surface 109 and the flange fitting It is finished in a state where there is almost no gap with the surface 111.

  STEP 2 shows a process in which the arc welding jig is set aiming at the boundary surface between the end fitting surface 109 and the flange fitting surface 111 in the fitting portion 104. Carbon dioxide shield welding is used for arc welding, and carbon dioxide welding wire YGW11 is used.

  STEP 3 shows a process in which arc welding is performed. In this step, the arc welding proceeds while the carbon dioxide welding wire and the boundary surface between the end fitting surface 109 and the flange fitting surface 111 touch the arc and melt.

  At this time, molten particles are generated when the steel plate and the welding wire are melted by a high-temperature arc of several thousand degrees, but there is almost no gap between the inner diameter fitting surface 108 and the outer diameter fitting surface 110 as described above. In this way, since the path through which the molten particles having the property of flying in a straight line is cut off, it does not enter the cylindrical case 102 or the lid case 103.

  Further, welding fumes are generated when the steel sheet and the welding wire that have been exposed to the high-temperature arc are vaporized, but they are discharged from the fitting portion 104 to the outside through the gaps of the spiral groove 112 described above.

  STEP 4 shows a process in which the welded wire 105 and the end fitting surface 109 and the flange fitting surface 111 are cooled and solidified to form the welded portion 105 by completing the sealed container 101 in the step 3.

  The welded part 105 formed in the above assembling process is discharged outside without leaving any welding fumes generated during arc welding before being cooled and solidified, so that a pinhole is generated in any part of the welded part 105. The confidentiality inside and outside the sealed container 101 is ensured.

  In the compressor completed through the above steps, the compression element 107 performs a predetermined compression work, and discharges the high-temperature / high-pressure refrigerant gas 106 into the sealed container 101, thereby filling the sealed container 101 with the high-temperature / high-pressure refrigerant gas 106. It is.

  Here, since there is no pinhole in the entire welded portion 105, the inside of the sealed container 101 is completely sealed, so that the refrigerant gas 106 does not leak to the outside of the sealed container 101.

  As described above, according to the present embodiment, it is possible to provide a hermetic compressor with stable quality, high productivity, and low cost by preventing leakage of the weld and reducing the inspection man-hours. It can be done.

(Embodiment 2)
6 is a side cross-sectional view of a hermetic compressor according to Embodiment 2 of the present invention, FIG. 7 is an enlarged cross-sectional view of a main part of the hermetic compressor according to the same embodiment, and FIG. FIG. 8B is an enlarged view of arrow B in FIG. 8A, FIG. 9 is a shaving process diagram of the lid case in the same embodiment, FIG. These are the welding process diagrams of the hermetic compressor in the same embodiment.

  6 to 10, the sealed container 201 is composed of a cylindrical case 208 and a lid case 202 manufactured by compositionally deforming an iron plate, and a fitting portion 203 formed by fitting with each other's fitting surface is The entire circumference is welded by arc welding from the outer circumference to form a welded portion 204.

  The hermetic container 201 is filled with a refrigerant gas 209 and accommodates the compression element 210.

  Next, the configuration of the lid case 202 will be described. The lid case 202 is formed by press forming an iron plate having a thickness of 3 mm, then forming a flange fitting surface 205 by shaving, and then forming an outer diameter fitting surface 206 by cutting. At this time, the outer diameter fitting surface 206 is finished with a flat surface with high surface roughness by cutting, and the flange fitting surface 205 is also finished with a flat surface with high surface roughness by surface pressing by shaving.

  Further, the outer diameter dimension of the outer diameter fitting surface 206 is adjusted at the time of cutting so as to be press-fitted to the inner diameter fitting surface 211 of the cylindrical case 208.

  The lattice-shaped grooves 207 are formed in the flange fitting surface 205 when the flange fitting surface 205 is formed by shaving. The lattice-shaped grooves 207 are formed over the entire surface of the flange fitting surface 205 with a groove width of 0.8 mm and a distance between lattices of 1.6 mm.

  FIG. 9 shows a step of forming a lattice-like groove 207 in the shaving process of the lid case 202.

  STEP 1 shows a process in which a shaving cutter is set in a lid case 202 formed by press molding. The shaving cutter has a grid-like protrusion.

  STEP 2 shows a process of forming the grid-like groove 207 at the same time as forming the flange fitting surface 205 by shaving.

  STEP 3 shows the lid case 202 after the shaving process.

  The configuration of the fitting portion 203 formed by fitting the lid case 202 and the cylindrical case 208 formed as described above will be described.

  The fitting portion 203 is formed by a radial press-fitting between the inner diameter fitting surface 211 and the outer diameter fitting surface 206 and an abutting fitting between the end fitting surface 212 and the flange fitting surface 205. Therefore, although there is almost no gap in the fitting portion 203, a gap due to the lattice-like groove 207 is reliably formed therein. Further, after the fitting, the fitting portion 203 is prevented from being easily detached by the fixing force by the radial press fitting.

  Next, a process of welding and fixing the fitting portion 203 formed as described above by arc welding will be described.

  FIG. 10 shows the process from the state in which the fitting portion 203 of STEP 1 is assembled to the completion of the welding fixing of STEP 4.

  In STEP 1, the lid case 202 is inserted inside the cylindrical case 208 to the innermost end where the end fitting surface 212 and the flange fitting surface 205 are in contact with each other, and the inner diameter fitting surface 211 and the outer diameter fitting surface 206 are press-fitted. It is temporarily fixed by the fixing force by fitting.

  In this state, the gap between the inner diameter fitting surface 211 and the outer diameter fitting surface 206, the end fitting surface 212, and the flange fitting are securely maintained while the gap between the grid-like grooves 207 formed by shaving is reliably maintained. It is finished in a state where there is almost no gap with the mating surface 205.

  STEP 2 shows a process in which the arc welding jig is set aiming at the boundary surface between the end fitting surface 212 and the flange fitting surface 205 in the fitting portion 203. Carbon dioxide shield welding is used for arc welding, and carbon dioxide welding wire YGW11 is used.

  STEP 3 shows a process in which arc welding is performed. In this step, the arc welding proceeds while the carbon dioxide welding wire and the boundary surface between the end fitting surface 212 and the flange fitting surface 205 come into contact with the arc and melt.

  At this time, molten particles are generated when the steel sheet and the welding wire are melted by a high-temperature arc of several thousand degrees, but there is almost no gap between the inner diameter fitting surface 211 and the outer diameter fitting surface 206 as described above. In this way, the path through which the molten particles having the property of flying in a straight line is cut off, so that it does not enter the cylindrical case 208 or the lid case 202.

  Further, welding fumes are generated when the steel sheet and the welding wire that have been exposed to the high-temperature arc are vaporized, but they pass through the gaps of the lattice-like grooves 207 described above and are discharged from the fitting portion 203 to the outside. .

  STEP 4 shows a process in which the welded wire 204 and the end fitting surface 212 and the flange fitting surface 205 are cooled and solidified to form the welded portion 204 and the sealed container 201 is completed.

  Since the welded part 204 formed in the above assembling process is discharged outside without leaving the welding fume generated during arc welding before being cooled and solidified, a pinhole is generated in any part of the welded part 204. The confidentiality inside and outside the sealed container 201 is ensured.

  In the compressor completed through the above steps, the compression element 210 performs a predetermined compression work, and discharges the high-temperature / high-pressure refrigerant gas 209 into the sealed container 201 to fill the sealed container 201 with the high-temperature / high-pressure refrigerant gas 209. It is. Here, since the welded portion 204 has no pinhole throughout, the inside of the sealed container 201 is completely sealed, so that the refrigerant gas 209 does not leak to the outside of the sealed container 201.

  As described above, according to the present embodiment, it is possible to provide a hermetic compressor with stable quality, high productivity, and low cost by preventing leakage of the weld and reducing the inspection man-hours. It can be done.

(Embodiment 3)
FIG. 11 is a side sectional view of the hermetic compressor according to the third embodiment of the present invention, FIG. 12 is an enlarged sectional view of a main part of the hermetic compressor according to the same embodiment, and FIG. FIG. 13B is an enlarged view of an arrow C in FIG. 13A, FIG. 14 is a coining process diagram of the cylindrical case in the same embodiment, FIG. These are the welding process diagrams of the hermetic compressor in the same embodiment.

  11 to 15, the sealed container 301 includes a cylindrical case 302 and a lid case 308 that are manufactured by compositionally deforming an iron plate. The entire circumference is welded by arc welding from the outer circumference to form a welded portion 304.

  The hermetic container 301 is filled with a refrigerant gas 309 and houses the compression element 310.

  Next, the configuration of the cylindrical case 302 will be described. The cylindrical case 302 is formed by winding an iron plate having a thickness of 2.5 mm punched out by a press into a tubular shape, and a joint (not shown) is connected by high-frequency welding, and then roundness is ensured by tube expansion molding, and an inner diameter fitting surface 305 is formed. The inner diameter is adjusted. At this time, the inner diameter fitting surface 305 is finished with a flat surface having a high surface roughness. Further, the outer diameter dimension of the outer diameter fitting surface 311 is adjusted so that the inner diameter fitting surface 305 of the cylindrical case 302 is press-fitted.

  The radial grooves 307 are formed on the end fitting surface 306 by coining after adjusting the inner diameter of the cylindrical case 302. The radial grooves 307 are formed over the entire end fitting surface 306 with a groove width of 0.8 mm and an inter-groove distance of 1.6 mm.

  FIG. 14 shows a step of forming the radial grooves 307 in the coining process of the cylindrical case 302.

  STEP 1 shows a process of setting a coining jig on the cylindrical case 302 whose inner diameter is adjusted. Radial protrusions are formed on the coining jig.

  STEP 2 shows a step of forming radial grooves 307 in the end fitting surface 306 by coining.

  STEP 3 shows the cylindrical case 302 after completion of coining.

  The configuration of the fitting portion 303 formed by fitting the lid case 308 and the cylindrical case 302 formed as described above will be described.

  The fitting portion 303 is formed by a radial press-fitting between the inner diameter fitting surface 305 and the outer diameter fitting surface 311 and an abutting fitting between the end fitting surface 306 and the flange fitting surface 312. Therefore, although there is almost no gap in the fitting part 303, the gap by the radial groove 307 is reliably formed therein. Further, after the fitting, the fitting portion 303 is prevented from being easily detached by the fixing force by the radial press fitting.

  Next, a process of welding and fixing the fitting portion 303 formed as described above by arc welding will be described.

  FIG. 15 shows the process from the state in which the fitting portion 303 of STEP 1 is assembled to the completion of the welding fixing of STEP 4.

  In STEP 1, the lid case 308 is inserted inside the cylindrical case 302 as far as the end fitting surface 306 and the flange fitting surface 312 come into contact with each other, and the inner diameter fitting surface 305 and the outer diameter fitting surface 311 are press-fitted. It is temporarily fixed by the fixing force by fitting. In this state, the gap between the radial fitting surface 305 and the outer diameter fitting surface 311, the end fitting surface 306, and the flange fitting are maintained while the gap between the radial grooves 307 formed by coining is reliably maintained. The surface 312 is almost free of gaps.

  STEP 2 shows a process in which the arc welding jig is set aiming at the boundary surface between the end fitting surface 306 and the flange fitting surface 312 in the fitting portion 303. Carbon dioxide shield welding is used for arc welding, and carbon dioxide welding wire YGW11 is used.

  STEP 3 shows a process in which arc welding is performed. In this step, the arc welding proceeds while the carbon dioxide welding wire and the boundary surface between the end fitting surface 306 and the flange fitting surface 312 touch the arc and melt. At this time, molten particles are generated when the steel plate and the welding wire are melted by a high-temperature arc of several thousand degrees, but there is almost no gap between the inner diameter fitting surface 305 and the outer diameter fitting surface 311 as described above. Since the path through which the molten particles having the property of flying linearly passes is cut off, the cylindrical case 302 and the lid case 308 do not enter.

  In addition, welding fumes are generated when the steel sheet and the welding wire that have been exposed to the high-temperature arc are vaporized, but they pass through the gaps of the radial grooves 307 described above and are discharged from the fitting portion 303 to the outside.

  STEP 4 shows a process in which the welded wire 304 and the end fitting surface 306 and the flange fitting surface 312 are cooled and solidified to form a welded portion 304 and the sealed container 301 is completed in the process of STEP 3.

  Since the welded part 304 formed in the above assembly process is discharged outside without leaving the welding fume generated during arc welding before being cooled and solidified, a pinhole is generated in any part of the welded part 304. The confidentiality inside and outside the sealed container 301 is ensured.

  In the compressor completed through the above steps, the compression element 310 performs a predetermined compression work, and discharges the high-temperature / high-pressure refrigerant gas 309 into the sealed container 301 to fill the sealed container 301 with the high-temperature / high-pressure refrigerant gas 309. It is. Here, since the welded portion 304 has no pinhole throughout, the inside of the sealed container 301 is completely sealed, so that the refrigerant gas 309 does not leak to the outside of the sealed container 301.

  As described above, according to the present embodiment, it is possible to provide a hermetic compressor with stable quality, high productivity, and low cost by preventing leakage of the weld and reducing the inspection man-hours. It can be done.

  The compressor according to the present invention enables a compressor with stable quality while ensuring high productivity. Therefore, a compressor used in a refrigeration cycle such as a home refrigerator, a dehumidifier, a showcase, a vending machine, etc. Applicable to.

Side surface sectional drawing of the hermetic compressor in Embodiment 1 of this invention The principal part expanded sectional view of the hermetic compressor in the embodiment The principal part expanded sectional view of the cylindrical case in the embodiment The principal part enlarged view of the cover case in the same embodiment Welding process diagram of hermetic compressor in the same embodiment Side surface sectional drawing of the hermetic compressor in Embodiment 2 of this invention The principal part expanded sectional view of the hermetic compressor in the embodiment (A) The principal part expanded sectional view of the cover case in the embodiment (b) The arrow B enlarged view of Fig.8 (a) Shaving process chart of lid case in the same embodiment Welding process diagram of hermetic compressor in the same embodiment Side surface sectional drawing of the hermetic compressor in Embodiment 3 of this invention The principal part expanded sectional view of the hermetic compressor in the embodiment (A) The principal part expanded sectional view of the cylindrical case in the embodiment (b) The arrow C enlarged view of Fig.13 (a) Coining process diagram of cylindrical case in the same embodiment Welding process diagram of hermetic compressor in the same embodiment Side sectional view of a conventional hermetic compressor Main section enlarged sectional view of a conventional hermetic compressor Main section enlarged view of a conventional cylindrical case The main part expanded sectional view of the conventional lid case

Explanation of symbols

101, 201, 301 Sealed container 102, 208, 302 Cylindrical case 103, 202, 308 Lid case 104, 203, 303 Fitting part 109, 212, 306 End fitting surface 111, 205, 312 Flange fitting surface 112 Spiral groove

Claims (5)

  A cylindrical case and a lid case manufactured by plastic molding of a steel plate are provided, the cylindrical case and the lid case are fitted to each other by a fitting portion, and the fitting portion is welded from the outer circumference to the entire circumference. A hermetic compressor in which a hermetic container is formed and a slight gap is formed in a part of the contact surface of the fitting portion.   The hermetic compressor according to claim 1, wherein the gap is formed by a spiral groove and is formed in at least one of a cylindrical case and a lid case.   The hermetic compressor according to claim 2, wherein the spiral groove is formed by cutting.   2. The hermetic compressor according to claim 1, wherein the gap is formed by shaving on a flange fitting surface where the lid case contacts the end fitting surface of the cylindrical case.   The hermetic compressor according to claim 1, wherein the gap is formed on the end surface of the cylindrical case by coining.

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