JP2008019786A - Scroll compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To implement a sectional shape of a chip seal that solves the problem wherein a substantially rectangular sectional shape lets edges interfere with chip seal groove wall surfaces to lower floatation performance when a torsional force acts on the chip seal. <P>SOLUTION: The chip seal 244 is shaped in section to have a relief portion 286 that is an outer chamfer on the opposite of a sealing face in a substantially half wrap section from a wrap terminal 285 of an orbiting scroll 213 toward the wrap origin, and also to have a relief portion 287 that is an inner chamfer on the opposite of the sealing face except in the substantially half wrap section from the wrap terminal 285 of the orbiting scroll 213. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a tip seal of a scroll compressor used for an air conditioner or the like.

  Hereinafter, an oil supply system to the compressor mechanism of a conventional scroll compressor and the function of the tip seal will be described with reference to the drawings.

  FIG. 6 is a longitudinal sectional view of a conventional scroll compressor, and FIG. 7 is a partial sectional view of the compression mechanism.

  A compression mechanism and a stator 203a of an electric motor that drives the compression mechanism are fixed inside an airtight container 201 having an oil reservoir 207 that stores lubricating oil at the bottom, and a crankshaft that drives the compression mechanism to a rotor 203b of the electric motor An oil reservoir 207 is formed around the compression mechanism of the sealed container 201. The compression mechanism includes a fixed scroll 210, a turning scroll 213 that meshes with the fixed scroll 210 to form a plurality of compression chambers 214, a rotation restraining component 215 that prevents the turning of the turning scroll 213 and makes only turning, An orbiting drive shaft 222 provided on the opposite side of the orbiting scroll 213, an eccentric bearing 223 provided inside the main shaft 218 of the crankshaft 206 and fitted with the orbiting drive shaft 222, and a main shaft 218 of the crankshaft 206. A bearing part 221 having an axial movement limiting flat surface portion 226 for limiting the axial movement of the orbiting scroll 213 is disposed with a small gap from the main bearing 219 to be supported and the back of the end plate 224 behind the orbiting scroll 213. To do. A sliding partition ring 225 that divides the gas pressure applied to the end plate back surface 224 into a discharge pressure applied to the central portion and a pressure lower than the discharge pressure applied to the outer periphery of the end plate back surface 224 is disposed on the axial movement restriction plane portion 226. . The back pressure chamber 245 formed in the space outside the sliding partition ring 225 is the center of the orbiting scroll end plate back surface 224 via a first communication passage 241 having a throttle mechanism 246 provided inside the orbiting scroll end plate 213. It is the structure which communicates with the space 249 where the discharge pressure of a part acts.

  Further, a second communication passage 248 formed in the inside of the orbiting scroll end plate 227 and communicating with the tip seal storage groove 251 is branched from the middle of the first communication passage 241 communicating with the back pressure chamber 245. The throttle mechanism 246 is provided in the downstream first communication passage.

  Further, the crankshaft 206 is also provided with an oil supply passage 243 penetrating the crankshaft 206. An end surface of the oil supply passage 243 on the side opposite to the compression mechanism is an oil reservoir 207 via an oil pump 242, and an end surface on the compression mechanism side is an orbiting scroll end plate. It is configured to communicate with a space 249 in which the discharge pressure at the center of the back surface 224 acts.

  With this configuration, the lubricating oil guided from the oil reservoir 207 to the space 249 in which the discharge pressure at the center of the orbiting scroll end plate back 224 acts by the oil pump 242 or the like is throttled from the first communication passage 241. An appropriate amount is supplied to the outermost compression chamber via the mechanism 246 and is formed in the clearance on the back surface of the chip seal storage groove 251 and the chip seal 244 from the second communication path 248 branched from the first communication path 241. By being sufficiently supplied to the space, the leakage path to the low pressure side formed in the longitudinal direction of the tip seal storage groove 251 is blocked, and the compression chamber is formed by the lubricating oil overflowing from the tip seal storage groove 251. It was the oil supply composition which also supplies to the wall surface.

Further, as shown in FIG. 5, the tip seal 244 is formed with an appropriate length in the longitudinal direction shorter than the tip seal storage groove 251, and a gap 270 is formed at the winding start end to form the tip seal storage groove 251. Since the swivel scroll 213 is swung, the swivel movement of the orbiting scroll 213 causes the discharge pressure to be introduced to the back surface of the tip seal 244 when the winding start end clearance 270 communicates with the discharge hole 260, and is pressed against the bottom surface of the fixed scroll 210. The leak passage to the lower pressure compression chamber formed outside across the tip seal 244 is blocked (see, for example, Patent Document 1).
JP 2000-213477 A

  However, in the above-described conventional configuration, the tip is reduced due to a pressure drop due to passage resistance in the downstream portion (winding end portion or suction side) more than half a turn from the opening end 252 of the discharge hole 260 and the second communication passage 248 on the tip seal storage groove side. Since the ability to float the seal 244 is reduced and the compression chamber 281 on the outer side of the chip seal has a higher pressure (see FIG. 4) than the inner compression chamber 282, the chip seal 244 is placed in the chip seal storage groove. As a result of being twisted and pressed against the inner and outer walls of 251, the end of winding of the tip seal 244 is caught and the floating becomes insufficient, and the tip seal 244 crosses the tip seal 244 and leaks into the compression chamber on the lower pressure side, resulting in reduced performance. Had problems.

  As a measure for improving this, there is a case where the position of the open end 252 of the second communication passage 248 is installed on the winding end side. In this case, the pressure difference between both ends of the second communication passage 248 becomes large. The high-pressure and high-temperature lubricating oil excessively leaks into the compression chambers 281 and 282 in the vicinity of the suction chamber via the chip seal storage groove 251, so that there is a problem that the performance is also deteriorated due to the overheat loss of the suction refrigerant. It was.

  The present invention solves such conventional problems, and an object thereof is to provide higher performance as a compressor.

  In order to solve the above problems, the present invention provides a chamfered relief portion on the outer side of the anti-seal surface of the tip seal installed in the approximately half-winding section from the winding scroll end to the winding start side, A tip seal cross-sectional shape is provided in which a chamfered relief portion is provided inside the anti-seal surface of the tip seal installed outside the almost half-winding section from the end.

  By making the tip seal cross-sectional shape as described above, it is possible to provide a scroll compressor that improves the floatability of the tip seal and ensures higher performance.

  The scroll compressor of this invention can provide the scroll compressor which ensures high performance by making it the cross-sectional shape which improves the floating property and stability of a chip seal.

  The scroll compressor of the present invention is provided with a chamfered relief portion on the outer side of the tip seal installed in the approximately half-winding section from the end of the orbiting scroll to the start of winding, and from the end of the orbiting scroll. By making the chip seal cross-sectional shape with a chamfered relief part inside the anti-seal surface of the chip seal installed outside the half-turn section, the floatability and stability of the chip seal are improved and the compression efficiency is increased. Can do.

(Embodiment 1)
Embodiments of the present invention will be described below with reference to the drawings.

  6 and 7 (FIG. 3), a compression mechanism and a stator 203a of an electric motor that drives the compression mechanism are fixed inside a sealed container 201 having a discharge pressure atmosphere having an oil reservoir 207 that accumulates lubricating oil at the bottom, and the electric motor A crankshaft 206 that drives the compression mechanism is coupled to the rotor 203b, and an oil reservoir 207 is formed around the compression mechanism of the sealed container 201. The compression mechanism includes a fixed scroll 210, a turning scroll 213 that meshes with the fixed scroll 210 to form a plurality of compression chambers 214, a rotation restraining component 215 that prevents the turning of the turning scroll 213 and makes only turning, An orbiting drive shaft 222 provided on the opposite side of the orbiting scroll 213, an eccentric bearing 223 provided inside the main shaft 218 of the crankshaft 206 and fitted with the orbiting drive shaft 222, and a main shaft 218 of the crankshaft 206. A bearing part 221 having an axial movement limiting flat surface portion 226 for limiting the axial movement of the orbiting scroll 213 is disposed with a small gap from the main bearing 219 to be supported and the back of the end plate 224 behind the orbiting scroll 213. To do. A sliding partition ring 225 that divides the gas pressure applied to the end plate back surface 224 into a discharge pressure applied to the central portion and a pressure lower than the discharge pressure applied to the outer periphery of the end plate back surface 224 is disposed on the axial movement restriction plane portion 226. . The back pressure chamber 245 formed in the space outside the sliding partition ring 225 has a discharge pressure at the center of the orbiting scroll end plate back surface 224 via the first communication passage 241 provided inside the orbiting scroll end plate 213. It is configured to communicate with the acting space 249.

  Further, a first communication passage 241 that communicates with the back pressure chamber 245 is formed in the inside of the orbiting scroll end plate 227.

  Further, the crankshaft 206 is also provided with an oil supply passage 243 penetrating the crankshaft 206. An end surface of the oil supply passage 243 on the side opposite to the compression mechanism is an oil reservoir 207 via an oil pump 242, and an end surface on the compression mechanism side is an orbiting scroll end plate. It is configured to communicate with a space 249 in which the discharge pressure at the center of the back surface 224 acts.

  With this configuration, the lubricating oil guided from the oil reservoir 207 to the space 249 in which the discharge pressure at the center of the orbiting scroll end plate back 224 acts by the oil pump 242 or the like is throttled from the first communication passage 241. An oil supply configuration is employed in which an appropriate amount is supplied to the outermost compression chamber via the mechanism 246 and the like.

  Further, as shown in FIG. 5, the tip seal 244 is formed to have an appropriate length shorter in the longitudinal direction than the tip seal storage groove 251 and an appropriate amount of clearance 270 is formed at the winding start end. Since the swivel motion of the orbiting scroll 213 causes the winding start end clearance 270 to communicate with the discharge hole 260, the discharge pressure is introduced into the back surface of the chip seal 244 and is pressed against the bottom surface of the fixed scroll 210. The leak passage to the lower pressure compression chamber formed outside across the seal 244 is blocked.

  Further, as shown in FIGS. 1 and 2, the tip seal 244 assembled in the tip seal storage groove 251 has a chamfered portion on the outer side of the anti-seal surface in the approximately half-winding section from the turning scroll winding end 285 to the winding start side. A cross-sectional shape 292 (291) is provided in which a relief portion 286 is provided and a chamfered relief portion 287 is provided on the inner side of the anti-seal surface except for the almost half winding section from the end 285 of the turning scroll winding.

By adopting the above-described tip seal cross-sectional shape, the tip seal floating property is deteriorated due to passage resistance loss caused by being away from the discharge hole 260, and the pressure difference between the compression chambers 281 (282) adjacent to the tip seal 244 is reduced. Chamfered relief of the tip seal 244 also at the point (see FIG. 1) on the almost half winding start side from the turning scroll winding end 285 where the tip seal 244 is pressed in a state of being twisted to both side walls of the tip seal storage groove 251. By the portions 286 and 287, the tip seal 244 can be easily lifted without being caught on the wall surface of the tip seal storage groove 251.

  By continuously performing this action, it is possible to provide a scroll compressor that stabilizes the rising of the chip seal and ensures higher performance.

  As described above, the scroll compressor of the present invention can provide a scroll compressor that ensures high performance by improving the floatability and stability of the chip seal, so that a refrigerator or an air compressor, It can also be applied to applications such as expanders.

The perspective view which shows the relative position relationship between the tip seal cross-sectional shape of the present invention and the orbiting scroll Enlarged view of the tip seal of the present invention viewed from the orbiting scroll side Enlarged sectional view of the compression mechanism of a conventional scroll compressor The figure which shows the timing when a chip seal outer compression chamber becomes pressure higher than an inner compression chamber Partial enlarged sectional view of the winding start portion of the scroll compression mechanism Longitudinal sectional view of a conventional scroll compressor Enlarged longitudinal sectional view of a compression mechanism of a conventional scroll compressor

Explanation of symbols

DESCRIPTION OF SYMBOLS 201 Airtight container 202 Compression mechanism 203a Electric motor 203b Electric motor 206 Crankshaft 207 Oil reservoir 210 Fixed scroll 213 Orbiting scroll 214 Compression chamber 215 Rotation restraint component 218 Main shaft 219 Main bearing 221 Bearing component 222 Orbit drive shaft 223 Eccentric bearing 225 Sliding partition ring 241 First communication passage 242 Oil pump 244 Tip seal 245 Back pressure chamber 251 Tip seal storage groove 254 Tip seal storage groove bottom surface 255 Fixed scroll bottom surface 260 Discharge hole 270 Chip seal winding start clearance 281 Outermost peripheral compression chamber 282 outside the chip seal Outermost peripheral compression chamber inside the tip seal 285 End of the turning scroll 286 Tip seal chamfered portion 287 Chip seal chamfered portion 291 Chip seal cross section 292 Chip seal cross section

Claims (1)

There is an oil reservoir for storing lubricating oil at the bottom, an internal motive of a sealed container on which discharge pressure acts, and a compression mechanism driven by this electric motor are arranged, and the compression mechanism is engaged with the fixed scroll and the fixed scroll. A rotating scroll that forms a single compression chamber, a rotation restraint component that prevents rotation of the orbiting scroll and allows only turning, a crankshaft that drives the orbiting scroll to rotate, and a main shaft that is formed on the crankshaft are supported. An orbiting drive mechanism configured to include a bearing part having a main bearing and engaged with an eccentric drive engaging portion provided on the crankshaft on the back surface of the end plate on the side opposite to the orbiting of the orbiting scroll to rotate the orbiting scroll. A joint portion is provided, and the pressure acting on the back surface of the end plate on the outer side of the turning drive engagement portion acts on the discharge pressure acting on the center portion of the back surface of the end plate and the outer periphery of the back surface of the end plate. A sliding partition ring that divides the pressure into a pressure lower than the discharge pressure is disposed, and high-pressure lubricating oil is supplied from the oil reservoir to the center of the back of the end plate, and the outer side of the center of the back of the end plate and the sliding partition ring A back pressure chamber formed in the space and a first communication passage formed in the end plate of the orbiting scroll, and is installed in a half-turn section from the end of the orbiting scroll to the beginning of the winding. A chamfered relief portion is provided outside the tip seal surface of the tip seal, and a chamfered relief portion is provided inside the anti-seal surface of the tip seal that is installed outside the half-turn section from the end of the orbiting scroll winding. A scroll compressor having a tip seal cross-sectional shape.

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