JPWO2020178899A1 - Compressor manufacturing method and compressor manufacturing equipment - Google Patents

Abstract

The method of manufacturing the compressor includes a step of inserting a positioning pin into the suction pipe to position the position of the fixing groove with respect to the convex portion, a step of heating the outer peripheral surface of the container at the position corresponding to the fixing groove, and a heated container. It has a step of pressing a pressing pin on the outer peripheral surface of the container to form a convex portion to be fitted in the fixing groove on the inner surface of the container, and a step of pulling out the positioning pin from the suction pipe after forming the convex portion.

Description

The present invention relates to a method for manufacturing a compressor by heating caulking.

Conventionally, a compressor is known to include a container forming an outer shell and a compression mechanism unit housed inside the container and having a compression chamber for compressing a refrigerant. As a method of fixing the compression mechanism portion inside the container, for example, Patent Document 1 discloses a method of manufacturing a compressor by heating caulking. In the manufacturing method of this compressor, a compression mechanism portion having a plurality of prepared holes formed on the outer peripheral surface is arranged inside the container, and a pressing jig is pressed against the outer peripheral surface of the heated container to fit the convex holes into the prepared holes. It is a structure that forms a part.

JP-A-2007-303378

In the method for manufacturing a compressor of Patent Document 1, the compression mechanism portion is conveyed to a fixing device in a state of being fitted in a gap inside the container, the container is fixed to the fixing device, and then the outer peripheral surface of the container is heated and pressed. A convex portion is formed by a jig. Therefore, the compression mechanism portion may rotate inside the container due to vibration during transportation, and the phase of the prepared hole and the portion where the pressing jig is pressed may be out of phase. In this state, if the pressing jig is pressed against the outer peripheral surface of the heated container, the load of the convex portion is applied to the outer peripheral surface of the compression mechanism portion located around the pilot hole, and the distortion of the compression mechanism portion may increase. be.

The present invention has been made to solve the above problems, and reduces the load received by the compression mechanism when the compression mechanism is fixed to the container by heating caulking to distort the compression mechanism. It is an object of the present invention to provide a method for manufacturing a compressor, which can suppress the pressure and can firmly and firmly fix the compression mechanism portion to the container.

The method for manufacturing a compressor according to the present invention includes a container forming an outer shell and a compression mechanism portion housed inside the container and having a compression chamber for compressing a refrigerant. The container includes a connection port and a connection port. It has a plurality of convex portions formed on the inner wall surface, and the compression mechanism portion has a suction port formed at a position corresponding to the connection port and a plurality of fixed portions formed at intervals in the circumferential direction. A method for manufacturing a compressor having a groove, in which the suction port and the connection port are connected by a suction pipe in which the suction port and the connection port are commonly inserted, and the convex portion and the fixing groove are fitted and fixed. , A step of inserting a positioning pin into the suction pipe to position the position of the fixing groove with respect to the convex portion, a step of heating the outer peripheral surface of the container at a position corresponding to the fixing groove, and the heated container. The step of pressing the pressing pin on the outer peripheral surface of the container to form the convex portion to be fitted into the fixing groove on the inner surface of the container, and the step of pulling out the positioning pin from the suction pipe after forming the convex portion. Have.

According to the method for manufacturing a compressor according to the present embodiment, the positioning pin is inserted into the suction pipe even if the compression mechanism rotates and the phase of the fixing groove shifts due to vibration or the like during transportation to the heating caulking device. Then, the center of the fixing groove and the center of the convex portion can be aligned. Therefore, when the compression mechanism portion is fixed to the container by heating caulking, the deviation between the fixing groove and the convex portion can be corrected, the load received by the compression mechanism portion can be reduced, and the distortion of the compression mechanism portion can be suppressed. Therefore, the compression mechanism can be securely and firmly fixed to the container.

It is a vertical cross-sectional view which showed a part of the internal structure of the compressor in embodiment of this invention. It is a cross section of the part A shown in FIG. 1 in a plan view, and is an enlarged view of a main part showing a stage before fixing the upper cylinder to the container. It is a cross-sectional view of the part A shown in FIG. 1 in a plan view, and is an enlarged view of a main part showing a state in which a convex portion is formed in a container and pushed into a fixing groove of an upper cylinder. It is explanatory drawing which showed the state which pushed the convex part formed in the container into the fixed groove which was displaced. It is sectional drawing which looked at the B part shown in FIG. 1 in a plan view. It is sectional drawing which showed the state which inserted the positioning pin into the suction pipe from the state of FIG. It is sectional drawing which shows typically the state which reduced the outer diameter of the positioning pin inserted into a suction tube. It is a cross-sectional view schematically showing the state by enlarging the outer diameter of the positioning pin inserted into the suction pipe. It is a vertical cross-sectional view which is a main part of a positioning pin and schematically shows the state which expanded the outer diameter. It is a vertical cross-sectional view which is a main part of a positioning pin and schematically shows the state which reduced the outer diameter. It is explanatory drawing which showed the procedure of fixing an upper cylinder to a container by a heating caulking device. It is sectional drawing of the pallet used in the manufacturing method of the compressor which concerns on embodiment of this invention. It is sectional drawing which showed the state which put the work on the pallet shown in FIG. It is a front view of the heating caulking apparatus used in the manufacturing method of the compressor which concerns on embodiment of this invention. It is a Q-line arrow view shown in FIG. It is explanatory drawing which shows the state of fixing the upper cylinder to a container by using the heating caulking mechanism in the manufacturing method of the compressor which concerns on embodiment of this invention. It is explanatory drawing which shows the mode of manufacturing the compressor which concerns on embodiment of this invention, and shows how the positioning pin is inserted into a work. It is R arrow view shown in FIG. It is explanatory drawing which showed the state which the suction pipe was deformed by the load generated by the heating caulking.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In each figure, the same or corresponding parts are designated by the same reference numerals, and the description thereof will be omitted or simplified as appropriate. In addition, the shape, size, arrangement, etc. of the configurations shown in each figure can be appropriately changed within the scope of the present invention.

Embodiment.
FIG. 1 is a vertical cross-sectional view showing a part of the internal structure of the compressor according to the embodiment of the present invention. In this embodiment, a manufacturing method of a twin rotary compressor will be described as an example.

As shown in FIG. 1, the compressor 100 is a twin rotary compressor having two cylindrical cylinders at the top and bottom. The compressor 100 is provided with a compression mechanism portion 101 inside the container 1 that forms the outer shell. The compression mechanism section 101 includes an upper cylinder 102, a lower cylinder 103, a spacer 104, an auxiliary bearing 105, a main bearing 106, and a crankshaft 107, and is provided inside the container 1. Driven by an omitted motor.

The upper cylinder 102 and the lower cylinder 103 each form a compression chamber. The spacer 104 is provided between the upper cylinder 102 and the lower cylinder 103 to separate the two compression chambers and seal the compression chambers. The auxiliary bearing 105 is provided on the upper surface of the upper cylinder 102 and seals the compression chamber of the upper cylinder 102. The main bearing 106 is provided on the lower surface of the lower cylinder 103 and seals the compression chamber of the lower cylinder 103. The crankshaft 107 is provided so as to penetrate the upper cylinder 102, the lower cylinder 103, the spacer 104, the auxiliary bearing 105, and the main bearing 106. Inside the compression chamber, the refrigerant gas is compressed by rotating the crankshaft 107 with an electric motor. The compressed refrigerant gas is supplied from the outside of the container 1 to the compression chamber of the upper cylinder 102 through the suction pipe 110 connecting the connection port 108 provided in the container 1 and the suction port 109 provided in the upper cylinder 102. Will be done. Although omitted in FIG. 1, the compressed refrigerant gas is passed through the container 1 through a suction pipe that connects another connection port provided in the container 1 and a suction port provided in the lower cylinder 103. It is also supplied from the outside of the lower cylinder 103 to the compression chamber of the lower cylinder 103.

Next, a method of fixing the upper cylinder 102 to the container 1 will be described. The upper cylinder 102 is in a gap-fitted state with respect to the container 1 before being fixed to the container 1. The gap fitting means a fitting in which the outer diameter of the upper cylinder 102 is equal to or less than the inner diameter of the container 1 and the upper cylinder 102 and the container 1 do not come into contact with each other even when the roundness of each other is taken into consideration. The outer diameter often refers to the average value of the outer diameters measured at two orthogonal points or three or more points including the two points. The same applies to the inner diameter. A fixing groove 120 is formed on the outer peripheral surface of the upper cylinder 102. The upper cylinder 102 is fixed to the container 1 by fitting the convex portion 123 formed by pushing the container 1 from the outer peripheral surface side into the fixing groove 120 at the portion located in the fixing groove 120.

FIG. 2 is a cross-sectional view of the part A shown in FIG. 1 in a plan view, and is an enlarged view of a main part showing a stage before fixing the upper cylinder to the container. As shown in FIG. 2, the upper cylinder 102 has a fixing portion 3 fixed to the inner peripheral surface of the container 1. The fixing portion 3 has a fixing groove 120 as a set of two and a convex portion 120a sandwiched between the two fixing grooves 120, and refers to a partial region of the outer peripheral surface of the upper cylinder 102. The two fixing grooves 120 are formed in close proximity to each other. The fixing portions 3 are provided at three positions at intervals of substantially equal pitch in the circumferential direction of the upper cylinder 102. That is, a total of six fixing grooves 120 are formed.

FIG. 3 is a cross-sectional view of the portion A shown in FIG. 1 in a plan view, and is an enlarged view of a main part showing a state in which a convex portion is formed in the container and pushed into the fixing groove of the upper cylinder. The upper cylinder 102 is fixed to the container 1 by heating caulking. In the heating caulking, first, the outer peripheral surface of the container 1 located around the fixing groove 120 is locally heated. Then, the crimping punch 122 provided with the two pressing pins 121 is pressed against the outer peripheral surface of the container 1 in which the fixing groove 120 is located. The pressing pin 121 has a columnar shape and a flat tip, and has an outer diameter equal to the inner diameter of the fixing groove 120 or a slightly smaller outer diameter than the inner diameter of the fixing groove 120. Two convex portions 123 that enter the fixing groove 120 are formed on the inner surface of the container 1, and two caulking points are formed. These two caulking points are called caulking parts. The caulking portions are formed at three locations on the outer peripheral surface of the upper cylinder 102 at substantially the same time. The crimped portions may be formed one by one at regular intervals.

By the way, the heating caulking is performed by a heating caulking device. The compressor 100 before the heating caulking is conveyed to the heating caulking device in a state where the upper cylinder 102 contained in the container 1 is gap-fitted. At this time, the upper cylinder 102 may rotate about the crankshaft 107 due to vibration or the like generated during transportation. That is, the position of the fixing groove 120 formed in the upper cylinder 102 may deviate from the position before the transfer.

FIG. 4 is an explanatory view showing a state in which the convex portion formed in the container is pushed into the fixed groove that is displaced. The dotted line indicates the center line X between the two fixing grooves 120. The alternate long and short dash line indicates the center line Y between the two pressing pins 121. The heating caulking is performed with the center line X between the two fixing grooves 120 and the center line Y between the two pressing pins 121 on the same straight line to minimize the load on the upper cylinder 102. The upper cylinder 102 can be fixed to the container 1. However, as shown in FIG. 4, the caulking punch 122 is pressed against the outer peripheral surface of the container 1 in a state where the center line X between the two fixing grooves 120 and the center line Y between the two pressing pins 121 are displaced. Then, the convex portion 123 is pressed against the outer peripheral surface of the upper cylinder 102 located around the fixing groove 120, and the strain of the upper cylinder 102 increases due to the load.

As described above, in order to suppress the distortion generated in the upper cylinder 102, the center line X between the two fixing grooves 120 and the center line Y between the two pressing pins 121 are on the same straight line. There is a need. On the other hand, the compressor 100 conveyed to the heating caulking device is positioned so that the height and the circumferential direction of the container 1 are always constant with respect to the caulking punch 122 installed in the heating caulking device. That is, the convex portion 123 formed in the container 1 is always formed at the same height position and the same circumferential position. Therefore, in order to arrange the center line X between the two fixing grooves 120 and the center line Y between the two pressing pins 121 on the same straight line, it is necessary to align the position of the fixing groove 120 with the convex portion 123. be.

The fixing groove 120 is formed on the outer peripheral surface of the upper cylinder 102 at a constant angle in the circumferential direction from the suction port 109. Further, the convex portion 123 is formed at a constant angle in the circumferential direction from the connection port 108 of the container 1. The angle from the suction port 109 to the fixing groove 120 and the angle from the connection port 108 to the convex portion 123 are equal. Therefore, if the positions of the suction port 109 and the connection port 108 match, the positions of the fixing groove 120 and the convex portion 123 naturally match. The position of the fixing groove 120 and the position of the convex portion 123 are formed on the outer peripheral surface of the upper cylinder 102 and the outer peripheral surface of the container 1 at intervals of 120 ° in the circumferential direction. The two locations will automatically match.

FIG. 5 is a cross-sectional view of the portion B shown in FIG. 1 as viewed in a plane. FIG. 6 is a cross-sectional view showing a state in which the positioning pin is inserted into the suction pipe from the state of FIG. As shown in FIGS. 1 and 5, the suction port 109 and the connection port 108 are connected by a suction pipe 110. The suction pipe 110 is provided so that the center line faces the central portion of the compression mechanism portion 101. The suction pipe 110 has a lower rigidity than the upper cylinder 102 and the container 1. Therefore, when the upper cylinder 102 rotates due to vibration or the like during transportation to the heating caulking device, the suction pipe 110 is pulled by the rotation of the upper cylinder 102, causing a deviation with respect to the center direction of the upper cylinder 102. There is a risk of In order to correct the deviation of the suction pipe 110, it is necessary to position the suction port 109 and the connection port 108 after the transfer to the heating caulking device is completed. Therefore, in the present embodiment, as shown in FIG. 6, the positioning pin 124 is inserted into the suction pipe 110 to position the suction port 109 and the connection port 108. Therefore, the center line of the suction port 109 and the center line of the connection port 108 are aligned with each other and pass through the center of the upper cylinder 102. Therefore, the center line X between the two fixing grooves 120 and the center line Y between the two pressing pins 121 are on the same straight line.

FIG. 7 is a cross-sectional view schematically showing a state in which the outer diameter of the positioning pin inserted into the suction pipe is reduced. FIG. 8 is a cross-sectional view schematically showing a state in which the outer diameter of the positioning pin inserted into the suction pipe is enlarged. FIG. 9 is a vertical cross-sectional view schematically showing a state in which the outer diameter is enlarged, which is a main part of the positioning pin. FIG. 10 is a vertical cross-sectional view schematically showing a state in which the outer diameter is reduced, which is a main part of the positioning pin.

As shown in FIG. 7, the outer diameter of the positioning pin 124 is smaller than the inner diameter of the suction pipe 110. Then, as shown in FIGS. 7 to 10, the outer peripheral surface of the positioning pin 124 is covered with a rubber 125 having a thickness of about 1.0 mm. Further, the positioning pin 124 is provided with a collet mechanism 4 inside. As shown in FIGS. 9 and 10, the collet mechanism 4 includes a piston 126 that operates by sucking or enclosing compressed air, a wedge portion 128 that operates in conjunction with the operation of the piston 126, and a piston 126 and a wedge portion 128. It has a shaft 127 and a connecting shaft 127. The positioning pin 124 operates the piston 126 by sucking compressed air from the states shown in FIGS. 7 and 9, and the wedge portion 128 operates in conjunction with the operation of the piston 126, as shown in FIGS. 8 and 10. As shown, the outer diameter expands. On the other hand, in the positioning pin 124, the piston 126 operates by enclosing compressed air from the state shown in FIGS. 8 and 10, and the wedge portion 128 operates in conjunction with the operation of the piston 126. As shown in 9, the outer diameter becomes smaller and returns to the original state.

When the outer diameter of the positioning pin 124 is expanded by the collet mechanism 4, the rubber 125 comes into contact with the inner surface of the suction pipe 110 and is chucked. The position of the suction pipe 110 is adjusted so that the center line is on the same straight line as the center line of the positioning pin 124 by the gripping force when the positioning pin 124 is chucked. As a result, the center line of the suction port 109 and the center line of the connection port 108 are finely adjusted according to the suction pipe 110, and are aligned on the same straight line toward the center of the upper cylinder 102.

As described above, in the method for manufacturing the compressor according to the present embodiment, in order to perform heating caulking without applying a load to the upper cylinder 102 as much as possible, the positioning pin 124 is set to be inserted into the suction pipe 110 for suction. The upper cylinder 102 is fixed to the container 1 in a state where the port 109 and the connection port 108 are continuously positioned.

Next, a procedure for fixing the upper cylinder to the container with the heating caulking device will be briefly described with reference to FIG. FIG. 11 is an explanatory view showing a procedure for fixing the upper cylinder to the container by the heating caulking device. First, the compressor is conveyed into the heating caulking device (S101). Then, the positioning pin 124 is inserted into the suction pipe 110 (S102), and compressed air is sucked from the positioning pin 124 to activate the collet mechanism 4 (S103). As a result, the suction port 109 and the connection port 108 are positioned. Then, the outer peripheral surface of the container 1 around the fixing groove 120 is locally heated (S104). The caulking punch 122 provided with the pressing pin 121 is pressed against the outer peripheral surface of the heated container 1 to form the convex portion 123, and the convex portion 123 is pushed into the fixing groove 120 to fix the upper cylinder 102 to the container 1 (S105). .. After the pushing of the convex portion 123 is completed, compressed air is sealed inside the positioning pin 124, the positioning pin 124 is returned to the original state (S106), and the positioning pin 124 is pulled out from the container 1 (S107).

The mechanism for expanding or contracting the outer diameter of the positioning pin 124 is not limited to the collet mechanism 4 shown. For example, a mechanism that directly expands or contracts with compressed air, a mechanism that expands or contracts by driving an air cylinder, a mechanism that expands or contracts by driving a hydraulic cylinder, or the like may be used.

Further, when the outer diameter of the positioning pin 124 is equal to or slightly smaller than the inner diameter of the suction pipe 110, the suction port 109 and the connection port 108 can be connected without expanding the positioning pin 124 by using the collet mechanism 4 or the like. Positioning can also be performed. In this case, in order to position the suction port 109 and the connection port 108, after inserting the positioning pin 124 into the suction pipe 110, the positioning pin 124 is moved left and right so as to be aligned with the left and right inner walls of the connection port 108. However, since the upper cylinder 102 is fixed to the container 1 with the positioning pin 124 inserted, the suction port 109, the connection port 108, and the like are caused by the distortion of the container 1 and the upper cylinder 102 generated when the fixing is performed. Roundness may deteriorate. As a result, the suction pipe 110 may be crushed inward to fix the positioning pin 124, and the positioning pin 124 may not come off.

Further, the positioning pin 124 can be expanded to position the suction port 109 and the connection port 108 without providing the rubber 125 on the outer peripheral portion of the positioning pin 124. However, in this case, when the positioning pin 124 is expanded and positioned by the collet mechanism 4, the suction pipe 110, the suction port 109, and the connection port 108 may be deformed by the force of the positioning pin 124, and compression is performed. This leads to a decrease in the performance of the machine 100 and a lack of long-term reliability.

Next, a heating caulking device for positioning the compressor 100 when the container 1 is locally heated to form a caulking portion will be described with reference to FIGS. 12 to 19. In the following, the compressor 100 to be assembled is referred to as a work. During the assembly of the compressor 100, the work is always placed on a pedestal called a pallet.

FIG. 12 is a cross-sectional view of a pallet used in the method for manufacturing a compressor according to an embodiment of the present invention. FIG. 13 is a cross-sectional view showing a state in which the work is placed on the pallet shown in FIG. As shown in FIG. 12, the pallet 200 includes a pallet base 201, a pedestal 202, a work receiving ring 203, and a crankshaft receiving shaft 204 having a collet mechanism. A pedestal 202 is placed on the upper surface of the pallet base 201. A work receiving ring 203 and a crankshaft receiving shaft 204 are placed on the upper surface of the pedestal 202.

As shown in FIG. 13, the work receiving ring 203 is interposed between the pedestal 202 and the work 205 in order to adjust the height of the work 205 to a predetermined position. For compressors of different heights, by exchanging the work receiving ring 203 for each model, the height of the suction pipe 110 with respect to the heating caulking device 210 can always be kept constant, and the device can be shared. can.

As shown in FIG. 13, the work 205 is a twin rotary compressor having two compression chambers at the top and bottom in the axial direction. A compression mechanism 101 and an electric motor 129 are provided inside the container 1. The compression mechanism portion 101 is provided in a state where the upper cylinder 102 is not fixed to the container 1. The electric motor 129 has a stator 129a that is shrink-fitted and fixed to the inner wall surface of the container 1 by another device (not shown) in the step before being conveyed to the heating caulking device. The outer diameter of the stator 129a is slightly larger than the inner diameter of the container 1.

As shown in FIG. 13, the crankshaft receiving shaft 204 can chuck or unchuck the stator 129a by discharging or filling compressed air. Therefore, the stator 129a is fixed to the pallet 200 when the compressed air is discharged, and is released from the fixation when the compressed air is sealed. That is, the container 1 is fixed to the pallet 200 if the compressed air is discharged.

As described above, the fixing portions 3 are provided at three locations on the outer peripheral surface of the upper cylinder 102 at an equal pitch of approximately 120 °, and a total of six fixing grooves 120 are provided. Further, the upper cylinder 102 is provided with a suction port 109 that penetrates the outer peripheral surface and the inner peripheral surface in the radial direction.

In the compressor 100, which is an actual finished product, the upper cylinder 102 is arranged at the lower part, and the electric motor 129 is arranged at the upper part. However, as shown in FIG. 13, the work 205 in the process of being put into the heating caulking device is in an inverted state such that the upper cylinder 102 is on the upper part of the motor 129. The rotor is not fixed to the crankshaft 107 that transmits the driving force generated by the motor 129 to the upper cylinder 102 up to this step.

FIG. 14 is a front view of a heating caulking device used in the method for manufacturing a compressor according to an embodiment of the present invention. FIG. 15 is a view taken along the line Q shown in FIG. The pallet 200 on which the work 205 shown in FIG. 13 is mounted is conveyed to the lower portion 211 of the heating caulking device 210 shown in FIG. 14, and is transferred to the heating caulking mechanism 213 located above the heating caulking device 210 by the lift-up mechanism 212. Is lifted up. The lift-up mechanism 212 is a mechanism for setting the position of the container 1 of the work 205 with respect to the pressing pin 121 by raising the pallet 200 on which the work 205 is placed to the height of the heating caulking mechanism 213 and adjusting the position of the pallet 200. be. That is, the lift-up mechanism 212 adjusts the position and positions of the pallet 200 with respect to the heating caulking mechanism 213. As a result, the positioning of the work 205 with respect to the heating caulking mechanism 213, that is, the position of the convex portion 123 formed by the pressing pin 121 is determined.

The lift-up mechanism 212 has four positioning shafts 214 arranged so as to surround the pallet 200, four positioning bushes 215 arranged at positions corresponding to the positioning shafts 214, and a plate 216. The plate 216 supports the bottom surface of the pallet 200. On the upper surface of the plate 216, a positioning shaft 214 and an ascending pin 217 for ascending the pallet 200 from the lower portion 211 of the heating caulking device 210 to the heating caulking mechanism 213 are provided. The pallet 200 conveyed to the heating caulking device 210 is arranged directly above the raising pin 217, and is raised to the heating caulking mechanism 213 by the operation of the lift-up mechanism 212. At this time, the lift-up mechanism 212 raises the raising pin 217 on which the pallet 200 is placed and the positioning shaft 214 by raising the plate 216. The lift-up mechanism 212 stops the plate 216 from rising when the raised positioning shaft 214 hits the positioning bush 215. After the ascent is completed, the positioned work 205 is fixed by pressing the upper portion with the pressing shaft 220 that reciprocates by the air cylinder 218 and the guide 219.

The length of the positioning shaft 214 is set so that the work 205 on the pallet 200 has a regular height with respect to the heating caulking mechanism 213 while the lift-up mechanism 212 has stopped rising. The regular height means a height at which the height of the fixing groove 120 on the outer peripheral surface of the upper cylinder 102 can be adjusted to the pressing pin 121 of the heating caulking mechanism 213. As a result, the height position of the work 205 with respect to the heating caulking mechanism 213 is determined.

At this time, the end faces of the positioning shaft 214 and the positioning bush 215 come into contact with each other so as to surround the pallet 200. Therefore, the plate 216 becomes horizontal when the ascent stops, even if the plate 216 is tilted when ascending. That is, the pallet 200 and the work 205 are horizontal without being tilted with respect to the heating caulking mechanism 213. The number of positioning shafts 214 and 215 is not limited to four, respectively. If there are two or more positioning shafts 214 and two or more positioning bushes 215, the plate 216 can be raised. However, in order to make the plate 216 horizontal, it is preferable to provide three or more positioning shafts 214 and three or more positioning bushes 215 so as to surround the pallet 200.

When heat caulking is performed, if the same pressing force is applied to three places in the circumferential direction of the container 1 at the same time, no moment acts on the work 205. However, it is difficult to apply the same pressing force at the same time due to variations in the work 205 or control of the heating caulking device 210. In particular, when a time lag occurs, the positions of the fixing groove 120 of the work 205 and the pressing pin 121 may be displaced by fixing the first one of the three locations. Therefore, as shown in FIGS. 14 and 15, the heating caulking mechanism 213 includes a cylindrical backup shaft 221 that receives the pressing force of the caulking punch 122 on the side opposite to the fixed position of the work 205.

The backup shaft 221 is fixed to the flange 222. The flange 222 is connected to a caulking side flange 223 to which a caulking punch 122 having a pressing pin 121 at its tip is attached and four link shafts 224. A servo press 225 that reciprocates the caulking punch 122 at high speed is fixed to the caulking side flange 223.

As shown in FIG. 15, the heating caulking device 210 has three heating caulking mechanisms 213. Each heating caulking mechanism 213 holds four link shafts 224 around the caulking punch 122 and the backup shaft 221 so as to surround them. Since the caulking punch 122 and the backup shaft 221 are all at the same height in the heating caulking mechanism 213, the link shafts 224 are arranged so as to intersect each other at different intervals. Therefore, the sizes of the flange 222 and the crimping side flange 223 are different between the three heating caulking devices 210. For example, of the three heating caulking mechanisms 213, the four link shafts 224 have the smallest spacing, and the heating caulking mechanism having the four link shafts 224 arranged in the center has the flange 222 and the caulking side flange 223. The smallest.

As shown in FIG. 14, the three heating caulking mechanisms 213 have a configuration in which the flange 222 and the caulking side flange 223 can be integrally reciprocated in the extending direction of the link shaft 224 by an air cylinder 226 and a guide 227. Is. The heating caulking mechanism 213 brings the backup shaft 221 advanced from three directions by the linear motion of the guide 227 of the air cylinder 226 into contact with the lifted work 205. It is preferable that the heating caulking mechanism 213 moves three backup shafts 221 at the same time and brings the backup shafts 221 into contact with the work 205 at the same time in order to shorten the manufacturing time. The heating caulking mechanism 213 may bring three backup shafts 221 into contact with the work 205 one by one. In this case, since the work 205 is fixed by the pressing by the pressing shaft 220, the work 205 does not shift in position. Further, the backup shaft 221 may have a flat end surface which is a contact surface with the work 205, but if it is formed on a curved surface substantially the same as the outer peripheral surface of the container 1 which is the work 205, the outer circumference of the container 1 may be formed. The contact area with the surface becomes large, and the pressing force can be reliably received.

FIG. 16 is an explanatory view showing a method of manufacturing a compressor according to an embodiment of the present invention, in which an upper cylinder is fixed to a container by using a heating caulking mechanism. The container 1 and the upper cylinder 102 are connected by driving the suction pipe 110 into the connection port 108 and the suction port 109 by another device (not shown) in the step before the work 205 is conveyed to the heating caulking device 210. .. As shown in FIG. 16, the fixing grooves 120 are formed at equal pitches of 120 ° in the circumferential direction. Further, the caulking punch 122 and the backup shaft 221 are installed at an equal pitch of 120 ° in the circumferential direction.

Here, as shown in FIG. 16, the caulking punch 122 located in the vicinity of the suction port 109 is the first punch 122a, the caulking punch 122 substantially opposite to the suction port 109 is the second punch 122b, and the remaining caulking punch 122 is used. Let it be the third punch 122c. Further, the backup shaft 221 corresponding to each caulking punch 122 is referred to as a first backup 221a, a second backup 221b, and a third backup 221c. A positioning pin 124 is provided between the first punch 122a and the second backup 221b.

FIG. 17 is an explanatory view showing a method of manufacturing a compressor according to an embodiment of the present invention, in which a positioning pin is inserted into a work. FIG. 18 is a view taken along the R arrow shown in FIG. As shown in FIGS. 17 and 18, the positioning pin 124 is attached to a plate 235 having a thickness of about 19 mm and a width of about 25 mm, for example. The plate 235 is attached to an air slide table 236 attached to the top plate 2 of the heating caulking device 210. The air slide table 236 slides the positioning pin 124 in the left-right direction shown in FIG. 17 to insert the positioning pin 124 into the suction pipe 110 of the work 205.

The positioning pin 124 shown in FIG. 17 is inserted into the suction pipe 110 after the backup shaft 221 comes into contact with the work 205. The inserted positioning pin 124 is moved from the state shown in FIGS. 7 and 9 to the state shown in FIGS. 8 and 10 by operating the internal collet mechanism 4 by suction of compressed air. Expand toward. The enlarged positioning pin 124 chucks the suction pipe 110 from the inside via a rubber 125 attached to the periphery, and is the center of the suction port 109 and the connection port 108 connected by the suction pipe 110 and the center of the upper cylinder 102. And are arranged on the same straight line. That is, the center of the fixing groove 120 and the center of the pressing pin 121 are arranged on the same straight line, and the work 205 is positioned.

The positioned work 205 is locally heated around the fixed portion by the high-frequency heating coil 228 shown in FIG. The high-frequency heating coil 228 descends toward the container 1 of the work 205 by acting the vertical air cylinder 229 and the vertical guide 230. Then, the high-frequency heating coil 228 moves forward in the radial direction of the container 1 by acting the horizontal air cylinder 231 and the horizontal guide 232.

The high frequency heating coil 228 is fixed by the holder 233. The high-frequency heating coil 228 includes a retaining mechanism 234 that keeps a predetermined distance from the container 1 when the container 1 moves in the radial direction. The high-frequency heating coil 228 is positioned in a state where a predetermined distance is secured from the outer peripheral surface of the container 1 by moving the contact fixing mechanism 234 until it comes into contact with the container 1. The reason for moving the high-frequency heating coil 228 in the radial direction of the container 1 is that the dimensions of the container 1 vary, and simply by lowering the high-frequency heating coil 228, the three high-frequency heating coils 228 are always predetermined with respect to the work 205. This is because it is difficult to secure a distance.

Since the high-frequency heating coil 228 can secure a predetermined distance from the container 1 by bringing the contact mechanism 234 into contact with the container 1, the position can be determined with reference to the outer peripheral surface of the container 1. .. Therefore, the high-frequency heating coil 228 can always secure a predetermined distance from the container 1 without being affected by the variation in the dimensions of the container 1, and can be applied to the containers 1 having different outer diameters. Excellent versatility. The high-frequency heating coil 228 does not need to use the retaining mechanism 234, and may be positioned by using a non-contact method using, for example, infrared rays, as long as the outer peripheral surface of the container 1 can be used as a reference. ..

Each of the three heating caulking mechanisms 213 has a high-frequency heating coil 228, and when the high-frequency heating coil 228 is moved at the same time and a predetermined distance is secured from the container 1, the high-frequency heating coil 228 is secured. Electric power is supplied to 228, and the flowing current locally heats the container 1. The heating caulking mechanism 213 separates the high-frequency heating coil 228 from the container 1 when the heating range of the container 1 is heated to a predetermined temperature. The heating caulking mechanism 213 heats the container 1 to a predetermined temperature, and then operates the servo press 225 to advance the container 1 before the heat of the container 1 cools down. The time when the heat of the container 1 does not cool is, for example, within 1 second after the heating is completed. Then, when the servo press 225 is operated to advance the caulking punch 122 toward the container 1, a pressing force is applied to the container 1 by the pressing pin 121 provided at the tip of the caulking punch 122, and the convex portion 123 is formed. As a result, heating caulking is performed between the upper cylinder 102 and the fixing groove 120. When the heating caulking is completed, the servo press 225 is retracted to separate the pressing pin 121 of the caulking punch 122 from the container 1. Due to the heat shrinkage of the container 1 after cooling, a pinching force is generated toward the middle of the two fixing grooves 120. This is simultaneously carried out by three heating caulking mechanisms 213 to generate sandwiching forces at three locations at equal pitches, whereby the upper cylinder 102 is fixed to the container 1.

FIG. 19 is an explanatory view showing a state in which the suction pipe is deformed by the load generated by the heating caulking. After the heating caulking is completed, it is necessary to remove the positioning pin 124 inserted for positioning from the suction pipe 110. The load applied to the upper cylinder 102 during heating caulking is reduced by the positioning of the upper cylinder 102 described above, but does not become zero. Therefore, a slight load is applied to the upper cylinder 102 when the heating caulking is performed, which may cause distortion. The strain generated in the upper cylinder 102 distorts the outer diameter and inner diameter of the upper cylinder 102, the suction port 109, and the like. As shown in FIG. 19, the suction pipe 110 is deformed by this strain, and stress is applied to the inner diameter side of the positioning pin 124 that chucks the suction pipe 110 from the inside by the collet mechanism 4. The positioning pin 124 is difficult to come off from the suction pipe 110 due to the stress applied to the inner diameter side. However, the positioning pin 124 is unchucked from the suction pipe 110 and can be easily removed by enclosing the compressed air in the collet mechanism 4.

As described above, the method for manufacturing the compressor according to the present embodiment corresponds to the step of inserting the positioning pin 124 into the suction pipe 110 to position the position of the fixing groove 120 with respect to the convex portion 123, and the fixing groove 120. A step of heating the outer peripheral surface of the container 1 at the position where the container 1 is to be formed, a step of pressing a pressing pin 121 against the outer peripheral surface of the heated container 1 to form a convex portion 123 that fits into the fixing groove 120 on the inner surface of the container 1, and a convex portion. After forming 123, it has a step of pulling out the positioning pin 124 from the suction pipe 110. That is, according to the method for manufacturing a compressor according to the present embodiment, even if the compression mechanism portion 101 rotates due to vibration or the like during transportation to the heating caulking device 210 and the phase of the fixing groove 120 shifts, the suction pipe The positioning pin 124 can be inserted into the 110 to align the center of the fixing groove 120 with the center of the convex portion 123. Therefore, when the compression mechanism portion 101 is fixed to the container 1 by heating caulking, the deviation between the fixing groove 120 and the convex portion 123 can be corrected, the load received by the compression mechanism portion 101 is reduced, and the compression mechanism portion 101 is reduced. Since the distortion of the compression mechanism can be suppressed, the compression mechanism portion 101 can be securely and firmly fixed to the container 1. Further, the compressor 100 manufactured by the manufacturing method in the present embodiment can withstand an excessive force generated during operation even for long-term use, and noise due to rattling of built-in parts and noise and It is possible to realize a high-performance and highly reliable compressor that does not cause problems such as increased vibration.

Further, the positioning pin 124 has a collet mechanism 4 inside which expands the outer diameter or reduces the expanded outer diameter to the original state, and expands the outer diameter after being inserted into the suction pipe 110. The outer peripheral surface of the container 1 is heated to form the convex portion 123, and then the enlarged outer diameter is reduced and the container 1 is taken out from the suction pipe 110. Therefore, in the method of manufacturing the compressor according to the present embodiment, the position of the fixing groove 120 with respect to the convex portion 123 can be accurately positioned by enlarging the outer diameter of the positioning pin 124, and the center of the fixing groove 120 can be positioned. And the center of the convex portion 123 can be reliably aligned. Further, after heating and caulking, the enlarged outer diameter can be easily removed by reducing the enlarged outer diameter to the original state.

The collet mechanism 4 operates in conjunction with the operation of the piston 126, which operates by sucking or enclosing compressed air, and the operation of the piston 126, so that the outer diameter of the positioning pin 124 is expanded or the expanded outer diameter is reduced to the original state. It has a wedge portion 128 and a wedge portion 128. The outer diameter of the positioning pin 124 expands in conjunction with the piston 126 that operates by sucking compressed air, and the cuneus 128 expands in conjunction with the piston 126 that operates by enclosing compressed air. The configuration is such that the outer diameter is reduced to the original state. Therefore, in the method for manufacturing the compressor according to the present embodiment, since the collet mechanism 4 has a simple structure, it is easy to increase the outer diameter of the positioning pin 124 or reduce the enlarged outer diameter to the original state. Therefore, the workability of the manufacturing work can be improved.

Although the present invention has been described above based on the embodiments, the present invention is not limited to the configuration of the above-described embodiments. For example, the compressor 100 is not limited to the above-mentioned contents, and may include other components. Further, the compressor 100 is not limited to the twin rotary compressor, and can be similarly implemented by, for example, a single rotary compressor or a scroll compressor. In short, the present invention includes a range of design changes and application variations normally performed by those skilled in the art, as long as the technical idea is not deviated.

1 container, 2 top plate, 3 fixing part, 4 collet mechanism, 100 compressor, 101 compression mechanism part, 102 upper cylinder, 103 lower cylinder, 104 spacer, 105 auxiliary bearing, 106 main bearing, 107 crankshaft, 108 connection port , 109 suction port, 110 suction pipe, 120 fixing groove, 120a convex part, 121 pressing pin, 122 caulking punch, 122a first punch, 122b second punch, 122c third punch, 123 convex part, 124 positioning pin, 125 rubber , 126 pistons, 127 shafts, 128 wedges, 129 motors, 129a stators, 200 pallets, 201 pallet bases, 202 pedestals, 203 work bearing rings, 204 crankshaft bearings, 205 workpieces, 210 heating caulking devices, 211 lower parts, 212 Lift-up mechanism, 213 heating caulking mechanism, 214 positioning shaft, 215 positioning bush, 216 plate, 217 lift pin, 218 air cylinder, 219 guide, 220 holding shaft, 221 backup shaft, 221a 1st backup, 221b 2nd backup, 221c 3rd backup, 222 flange, 223 caulking side flange, 224 link shaft, 225 servo press, 226 air cylinder, 227 guide, 228 high frequency heating coil, 229 vertical air cylinder, 230 vertical guide, 231 horizontal air cylinder, 232 horizontal guide. 233 Holders, 234 Bearings, 235 Plates, 236 Air Slide Tables.

The present invention relates to a method for manufacturing a compressor by heating caulking and an apparatus for manufacturing a compressor.

The present invention has been made to solve the above-mentioned problems, and reduces the load received by the compression mechanism when the compression mechanism is fixed to the container by heating caulking to distort the compression mechanism. It is an object of the present invention to provide a method for manufacturing a compressor and an apparatus for manufacturing a compressor, which can suppress the above-mentioned problems and can securely and firmly fix the compression mechanism to the container.

The method for manufacturing a compressor according to the present invention includes a container forming an outer shell and a compression mechanism unit housed inside the container and having a compression chamber for compressing a refrigerant, and the container has a connection port. The compression mechanism unit has a suction port formed at a position corresponding to the connection port and a plurality of fixing grooves formed at intervals in the circumferential direction, and the suction port and the connection port are provided. Manufacture of a compressor in which the container is connected by a suction pipe inserted in common, the container is pushed in from the outer peripheral surface side with a caulking punch, a convex portion is fitted into the fixing groove , and the compression mechanism portion is fixed to the container. The method is a step of inserting a positioning pin into the suction pipe to position the position of the fixing groove with respect to the caulking punch, and a position corresponding to the fixing groove with the positioning pin inserted into the suction pipe. The step of heating the outer peripheral surface of the container and the pressing pin provided on the caulking punch are pressed against the outer peripheral surface of the container heated with the positioning pin inserted in the suction pipe to press the inner surface of the container. wherein the step that fits into the fixing groove to form the convex portion, after forming the convex portion, have a, a step of withdrawing the positioning pins from the suction pipe, the positioning pins, to expand the outer diameter, or It has a collet mechanism inside that reduces the enlarged outer diameter to the original state, and after being inserted into the suction pipe, the outer diameter is expanded and chucked to heat the outer peripheral surface of the container, and the above. After the pressing pin is pressed against the outer peripheral surface of the container to form the convex portion, the enlarged outer diameter is reduced and the container is pulled out from the suction pipe .
Further, the compressor manufacturing apparatus according to the present invention is a manufacturing apparatus used in the compressor manufacturing method, in which a high-frequency heating coil for heating the outer peripheral surface of the container and a heated outer peripheral surface of the container are used. The position of the caulking punch having the pressing pin to be pressed and forming the convex portion to be fitted into the fixing groove on the inner surface of the container, and the position of the fixing groove with respect to the caulking punch inserted into the suction pipe and the connection port. It is provided with the positioning pin for positioning the above.

According to the onset bright, due to vibrations or the like during transport to the heating staking device, the compression mechanism portion is out of phase of the fixing groove by rotation, by inserting the positioning pins in the suction pipe, the center of the fixing groove It can be aligned with the center of the convex part. Therefore, when the compression mechanism portion is fixed to the container by heating caulking, the deviation between the fixing groove and the convex portion can be corrected, the load received by the compression mechanism portion can be reduced, and the distortion of the compression mechanism portion can be suppressed. Therefore, the compression mechanism can be securely and firmly fixed to the container.

Claims (3)

A container forming an outer shell and a compression mechanism unit housed inside the container and having a compression chamber for compressing a refrigerant are provided.
The container has a connection port and a plurality of convex portions formed on the inner wall surface.
The compression mechanism portion has a suction port formed at a position corresponding to the connection port, and a plurality of fixing grooves formed at intervals in the circumferential direction.
A method for manufacturing a compressor in which the suction port and the connection port are connected by a suction pipe that is commonly inserted, and the convex portion and the fixing groove are fitted and fixed.
A step of inserting a positioning pin into the suction pipe to position the position of the fixing groove with respect to the convex portion, and
A step of heating the outer peripheral surface of the container at a position corresponding to the fixing groove, and
A step of pressing a pressing pin against the outer peripheral surface of the heated container to form the convex portion to be fitted into the fixing groove on the inner surface of the container.
A method for manufacturing a compressor, comprising a step of removing the positioning pin from the suction pipe after forming the convex portion. The positioning pin has a collet mechanism inside which expands the outer diameter or reduces the expanded outer diameter to the original state, and after being inserted into the suction pipe, the outer diameter is expanded and chucked. The method for manufacturing a compressor according to claim 1, wherein the outer peripheral surface of the container is heated to form the convex portion, and then the enlarged outer diameter is reduced and the container is extracted from the suction pipe. The collet mechanism
Pistons that operate by suction or encapsulation of compressed air,
It has a wedge portion that operates in conjunction with the operation of the piston and expands the outer diameter of the positioning pin or reduces the expanded outer diameter to the original state.
The cuneus portion of the positioning pin expands in conjunction with the piston that operates by sucking compressed air, and the wedge portion expands in conjunction with the piston that operates by enclosing compressed air. The method for manufacturing a compressor according to claim 2, wherein the outer diameter is reduced to the original state.

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