JP2006138209A - Closed type electric compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compressor which can reliably lock a rotor at the locking surface of a main shaft part and is high in reliability and low in height. <P>SOLUTION: The compressor contains an electric element consisting of a stator and a rotor 10; and a compression element driven by the electric element. The compression element is provided with a crank shaft 150 having a main shaft part 151 and an eccentric part 152; and a cylinder block 155 fixing the stator and forming a bearing part 157 pivoting the main shaft part 151. The rotor 104 forms approximately a cylindrical shape and has an element part 160 containing a permanent magnet 165, a female screw 174 situated at a cylinder bore, and a boss part 161 supporting the base of the element part 160. A screw part 153 is situated at the main shaft part of the crank shaft 150. A fixing force is improved by threadedly mounting the boss part 161, and reliable fixing can be executed even if the length of a threadedly mounting part is short. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a hermetic electric compressor (hereinafter referred to as a compressor) used in a refrigeration cycle such as a household refrigerator.

  In recent years, high efficiency has been demanded from the viewpoint of energy saving, high reliability and long life from the viewpoint of ecology, and further downsizing from the viewpoint of space saving. Among such compressors, there is a conventional compressor of this type that houses an electric element composed of a concentrated winding stator and a rotor with a permanent magnet in a sealed container and a compression element driven by the electric element ( For example, see Patent Document 1).

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

  FIG. 9 is a cross-sectional view of a conventional hermetic electric compressor described in Patent Document 1. In FIG. In FIG. 9, the refrigerating machine oil 2 is stored in the sealed container 1, and both the electric element 3 and the compression element 6 are stored in the sealed container 1.

  The electric element 3 includes a rotor 4 containing a permanent magnet (not shown) and a concentrated winding stator 5. The compression element 6 is constructed above the electric element 3 and is driven by the electric element 3.

  Next, details of the compression element 6 will be described below.

  The crankshaft 7 has a main shaft portion 8 that locks the rotor 4 and an eccentric portion 9 that is formed eccentric to the main shaft portion 8. The cylinder block 10 has a substantially cylindrical compression chamber 11 and a bearing portion 12 that pivotally supports the main shaft portion 8, and is formed above the electric element 3. The piston 13 is fitted into the compression chamber 11 and is connected to the eccentric portion 9 by the connecting means 14.

  Next, details of the electric element 3 will be described below.

  The concentrated winding stator 5 is fixed to the leg portion 16a of the cylinder block 10 by a bolt 16 through a stator core 15 formed by laminating silicon steel plates. The rotor 4 is formed by laminating silicon steel plates and has a built-in permanent magnet (not shown). The rotor 4 has a locking hole 17 and a boss portion 18, and the locking hole 17 and the boss portion 18 have a substantially cylindrical shape. The rotor 4 is locked to the locking surface 19 of the main shaft portion 8 by the locking hole 17, and the bearing portion 12 extends to the boss portion 18.

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

When the concentrated winding stator 5 is energized, the rotor 4 rotates and the crankshaft 7 is rotated via the locking hole 17 of the rotor 4 and the locking surface 19 of the main shaft portion 8. The main shaft portion 8 of the crankshaft 7 rotates while sliding with the inner peripheral surface of the bearing portion 12, and the eccentric motion of the eccentric portion 9 of the crankshaft 7 drives the piston 13 via the connecting means 14. The piston 13 reciprocates in the compression chamber 11 and continuously compresses refrigerant gas (not shown).
JP 2003-158846 A

  However, in the above conventional configuration, since the load of the piston 13 finally acts on the bearing portion 12, the length of the bearing portion needs to have a sliding length capable of withstanding the load, and the surface pressure of the bearing portion 12 with respect to the compressive load is reduced. It is necessary not to become extremely large.

  On the other hand, the rotor 4 is usually a locking hole 17 and is fixed to the locking surface 19 of the polished main shaft portion 8 of the crankshaft 7 by press-fitting or shrink-fitting. Even in such a case, the axial length of the locking hole 17 of the rotor 4 is necessary in order to obtain a fixing force that can be reliably locked.

  For these reasons, in order to reduce the overall height of the compressor and reduce the size, the length of the leg portion 16a of the cylinder block 10 is shortened, and the rotor 4 and the stator 5 are moved upward relative to the cylinder block 10. However, if the length of the locking hole 17 of the rotor 4 is shortened, the rotor 4 cannot be reliably locked, so that it is not possible to secure durability against impacts due to transportation, starting and stopping of the compressor. There was a problem that could not be miniaturized.

  The present invention solves the above-described conventional problem, and after taking the required length of the bearing portion 12, the rotor 4 can be reliably locked to the locking surface 19 of the main shaft portion 8, and the reliability is high. An object is to provide a compressor having a low overall height.

  In order to solve the above problems, a compressor of the present invention houses an electric element composed of a stator and a rotor, and a compression element driven by the electric element. The compression element includes a main shaft portion and an eccentric portion. And a cylinder block that forms a bearing that supports the main shaft and supports the main shaft, and the rotor has a substantially cylindrical shape and a female thread on the inner diameter. It has a boss part that supports the bottom of the main body part, a screw part is provided on the main shaft part of the crankshaft, and the boss part is screwed to ensure that the length of the locking hole of the rotor is short It can be fixed to the main shaft of the crankshaft.

  The compressor of the present invention increases the fixing force by screwing the rotor onto the crankshaft and provides a highly reliable compressor with a low overall height because it can be securely fixed even if the length of the screwed portion is short. I can do it.

  According to a first aspect of the present invention, an electric element including a stator and a rotor and a compression element driven by the electric element are housed in a sealed container. The compression element includes a main shaft portion and an eccentric portion. And a cylinder block that forms a bearing that supports the main shaft and supports the main shaft, and the rotor has a substantially cylindrical shape and a female thread on the inner diameter. And a boss part that supports the bottom surface of the main body part, a screw part is provided on the main shaft part of the crankshaft, and the rotor is fixed to the crankshaft by screwing the boss part. Since the fixing force is increased by screwing on the shaft, and the screw can be reliably fixed even if the length of the screwing portion is short, a compressor with high reliability and low overall height can be provided.

  The invention according to claim 2 of the present invention is the invention according to claim 1, wherein the boss portion of the rotor is screwed to the screw portion of the main shaft portion of the crankshaft and then screwed with a nut. It is possible to provide a highly reliable compressor with improved adhesion.

  The invention according to claim 3 of the present invention is the invention according to claim 1, wherein the rotor main body is formed of a silicon steel plate and the boss is formed of a non-magnetic material. Since the magnetic flux leakage to the boss portion can be greatly reduced, the efficiency of the electric element and the compressor can be increased.

  The invention described in claim 4 of the present invention is the salient pole concentrated winding type stator in which the winding is directly wound around the plurality of salient pole portions of the stator core via the insulator in the invention described in claim 1. Thus, since the coil end portion can be lowered, it is possible to provide a compressor having a small electric element and a low overall height.

  The invention according to claim 5 of the present invention is the invention according to any one of claims 1 to 4, wherein the permanent magnet housed in the rotor is a rare earth, and the permanent magnet can be further reduced, Since the rotor height can be further reduced, a compressor having a lower overall height can be provided.

  Embodiments of a compressor according to the present invention will be described below with reference to the drawings. The present invention is not limited to the embodiments.

(Embodiment 1)
1 is a cross-sectional view of a hermetic electric compressor according to Embodiment 1 of the present invention, and FIG. 2 is an enlarged view of a main part of FIG. FIG. 3 is a plan view of the concentrated winding stator in the embodiment, and FIG. 4 is an external view of the concentrated winding stator in the embodiment.

  Hereinafter, the present embodiment will be described with reference to FIGS.

  In FIG. 1 to FIG. 5, refrigerating machine oil 102 is stored in a sealed container 101. The electric element 103 includes a rotor 104 and a salient pole concentrated winding stator 105. The compression element 106 is constructed above the electric element 103 and is driven by the electric element 103.

  Both the electric element 103 and the compression element 106 are accommodated in the hermetic container 101 and supported by a spring 107. A terminal 108 constituting the hermetic container 101 conducts electricity, and supplies electricity to the electric element 103 through a lead wire 109.

  Details of the compression element 106 will now be described.

  The crankshaft 150 has a main shaft portion 151 and an eccentric portion 152 formed eccentrically with respect to the main shaft portion 151, and a screw portion 153 is formed on the main shaft portion 151. The outer diameter of the screw portion 153 is smaller than the diameter of the main shaft portion 151, and a step 154 is formed between the outer diameter of the screw portion 153 of the main shaft portion 151 and the outer diameter of the main shaft portion 151. The screw thread direction of the screw part 153 is a direction in which a tightening force is generated in the operation direction of the rotor 104.

  The cylinder block 155 includes a substantially cylindrical compression chamber 156, a bearing portion 157 that supports the main shaft portion 151, and a support portion 157a that is positioned above the rotor 104 and is connected to the bearing portion 157. Formed above the element 103.

  The piston 158 is fitted into the compression chamber 156 and is connected to the eccentric portion 152 by the connecting means 159.

  Next, details of the electric element 103 will be described below.

  The stator 105 is attached to the legs 159a of the cylinder block 155 with bolts 159b so as to maintain a substantially constant gap with the rotor 104. A stator core 250 constituting the stator 105 is formed by laminating an annular core core 252 formed with a die portion 251 at a predetermined interval, and a winding 253 is wound around the die portion 251. The connection line 254 connects the windings with one line. The winding 253 protrudes as a winding end 256 that is a coil end portion at a height of H1 and H2 from the end face of the stator core 250.

  The rotor 104 includes a main body 160 formed of laminated silicon steel plates and a housing hole 166 that stores a neodymium magnet 165 that is a rare earth magnet material. The main body 160 extends the bearing 157. A recess 167 is provided. Moreover, while preventing the neodymium magnet 165 from dropping out from the lower end opening part 163 of the storage hole 166, the boss | hub part 161 which supports a bottom face is fixed by welding.

  The boss portion 161 includes a bottom plate portion 170 that supports the bottom surface of the main body portion 160, and a fitting portion 172 that is fitted to the inner diameter of the concave portion 167 of the main body portion 160, and the inner diameter of the fitting portion is a female screw corresponding to the screw portion 153. A portion 174 is formed. The rotor 104 is screwed and fixed to the crankshaft 150 by being screwed into the screw portion 153 up to the step 154 of the female screw portion 174 of the boss portion 161.

  Here, the gap between the upper end of the rotor 104 and the support part 157a of the cylinder block 155 is H, the length of the bearing part 157 of the cylinder block 155 is L, and the thickness of the support part 157a of the cylinder block 155 is D.

  About the compressor comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  When electricity is supplied to the terminal 108, the salient pole concentrated winding stator 105 is energized through the lead wire 109, and the rotor 104 rotates at an arbitrary rotational speed by the magnetic field generated thereby. The rotor 104 rotates the crankshaft 150, and the eccentric movement of the eccentric portion 152 drives the piston 158 via the connecting means 159, whereby the piston 158 reciprocates in the compression chamber 156, and the refrigerant is continuously supplied. Compress.

  When the piston 158 compresses the refrigerant, the compression load applied to the piston 158 acts on the eccentric portion 152 via the connecting means 159 and is finally received by the main shaft portion 151 and the bearing portion 157.

  Since the surface pressure applied to the main shaft portion 151 and the bearing portion 157 with respect to the compressive load, that is, the load acting on the unit area is not extremely increased, the main shaft portion 151 and the bearing portion 157 are worn. The length L of the bearing portion 157 necessary for receiving the position is inevitably determined.

  In the present embodiment, the required length L of the bearing portion 157 is ensured, so that it can sufficiently withstand the compressive load, and abnormal wear does not occur.

  On the other hand, in order to reduce the height of the compressor, in this embodiment, the leg portion 159a of the cylinder block 155 is shortened and the stator 105 is attached to the leg portion 159a with a bolt 159b. Further, since the thickness D of the support portion 157a of the cylinder block 155 is reduced and the rotor 104 is attached with the gap H between the upper end of the rotor 104 and the support portion 157a of the cylinder block 155 being reduced, The height can be lowered.

  Since the rotor 104 is moved upward while maintaining the length L of the bearing portion 157, the concave portion 167 of the rotor 104 is deepened, and the length of the boss portion 161 supporting the bottom surface is inevitably shortened. .

  However, in this embodiment, the rotor 104 is screwed and fixed to the crankshaft 150 by being screwed into the screw portion 153 up to the step 154 of the female screw portion 174 of the boss portion 161, and the screw thread direction of the screw portion 153 is in operation. Since the tightening force is generated, the rotor 104 is not displaced with respect to the main shaft portion 151 and is not dropped from the main shaft portion 151 due to the rotational force.

  Since the permanent magnet built in the main body 160 can reduce the size of the magnet itself by using the neodymium magnet 165 having a strong magnetic force, the thickness and height of the main body 160 can be further reduced. It was. Therefore, a compressor with high reliability and low overall height could be provided.

  The stator 105 is obtained by intensively winding a winding 253 around a tooth portion 251 that is a salient pole portion via an insulator (not shown). Therefore, the winding 253 does not protrude from the iron core 252 and the overall height (dimensions H1, H2) of the winding end 256, which is the coil end portion, is also low.

  Therefore, the thickness of the main body 160 of the rotor 104 is reduced, and the overall height of the winding end 256 is also low, so that a compressor having a very low overall height can be realized.

  Further, the use of a non-magnetic brass material for the boss portion 161 supporting the bottom surface can greatly reduce the leakage of magnetic flux to the screwing and fixing, so that the efficiency of the electric element and the compressor can be increased.

(Embodiment 2)
FIG. 5 is a cross-sectional view of the hermetic electric compressor according to Embodiment 1 of the present invention, and FIG. 6 is an enlarged view of a main part of FIG. FIG. 7 is a plan view of the concentrated winding stator in the same embodiment, and FIG. 8 is an external view of the concentrated winding stator in the same embodiment.

  Hereinafter, the present embodiment will be described with reference to FIGS.

  5 to 8, the refrigerating machine oil 302 is stored in the sealed container 301. The electric element 303 includes a rotor 304 and a salient pole concentrated winding stator 305. The compression element 306 is constructed above the electric element 303 and is driven by the electric element 303.

  Both the electric element 303 and the compression element 306 are accommodated in the hermetic container 101 and supported by a spring 307. A terminal 308 constituting the hermetic container 301 conducts electricity, and supplies electricity to the electric element 303 through a lead wire 309.

  Details of the compression element 306 will now be described.

  The crankshaft 350 has a main shaft portion 351 and an eccentric portion 352 formed eccentric to the main shaft portion 351, and a screw portion 353 is formed on the main shaft portion 351. The outer diameter of the screw portion 353 is smaller than the diameter of the main shaft portion 351, and a step 354 is formed between the outer diameter of the screw portion 353 of the main shaft portion 351 and the outer diameter of the main shaft portion 351. The screw thread direction of the screw part 353 is a direction in which a tightening force is generated in the operation direction of the rotor 304. Below the boss portion 361, there is a nut 375 in the same direction as the thread of the screw portion 353. The nut 375 is screwed to the main shaft portion 351 and receives the tightening force at the lower end surface of the boss portion 361.

  The cylinder block 355 includes a substantially cylindrical compression chamber 356, a bearing portion 357 that supports the main shaft portion 351, and a support portion 357a that is positioned above the rotor 304 and is connected to the bearing portion 357. Formed above the element 303.

  The piston 358 is fitted into the compression chamber 356 and is connected to the eccentric portion 352 by the connecting means 359.

  Next, details of the electric element 303 will be described below.

  The stator 305 is attached to the legs 359a of the cylinder block 355 with bolts 359b so as to maintain a substantially constant gap with the rotor 304.

  A stator core 450 constituting the stator 305 is formed by laminating an annular core core 452 formed with a tooth portion 451 at a predetermined interval, and a winding 453 is wound around the tooth portion 451. A connecting line 454 connects the windings with one wire. The winding 453 protrudes as a winding end 456 that is a coil end portion at a height of H1 and H2 from the end face of the stator core 450.

  The rotor 304 includes a main body 360 formed of laminated silicon steel plates, and the main body 360 has a storage hole 366 that stores a neodymium magnet 365 that is a rare earth magnet material. The main body 360 extends the bearing 357. A recess 367 is provided. Further, the neodymium magnet 365 is prevented from falling off from the lower end opening 363 of the storage hole 366, and the boss portion 361 that supports the bottom surface is fixed by welding.

  The boss portion 361 includes a bottom plate portion 370 that supports the bottom surface of the main body portion 360, and a fitting portion 372 that is fitted to the inner diameter of the concave portion 367 of the main body portion 360. The inner diameter of the fitting portion is a female screw corresponding to the screw portion 353. A portion 374 is formed. The rotor 304 is screwed and fixed to the crankshaft 350 by being screwed into the screw portion 353 up to the step 354 of the female screw portion 374 of the boss portion 361.

  Here, the gap between the upper end of the rotor 304 and the support portion 357a of the cylinder block 355 is H, the length of the bearing portion 357 of the cylinder block 355 is L, and the thickness of the support portion 357a of the cylinder block 355 is D.

  About the compressor comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  When electricity is supplied to the terminal 308, current is supplied to the salient pole concentrated winding stator 305 through the lead wire 309, and the rotor 304 rotates at an arbitrary rotation speed due to the magnetic field generated thereby. The rotor 304 rotates the crankshaft 350, and the eccentric movement of the eccentric portion 352 drives the piston 358 via the connecting means 359, so that the piston 358 reciprocates in the compression chamber 356, and the refrigerant is continuously supplied. Compress.

  When the piston 358 compresses the refrigerant, the compression load applied to the piston 358 acts on the eccentric portion 352 via the connecting means 359 and is finally received by the main shaft portion 351 and the bearing portion 357.

  Unless the surface pressure applied to the main shaft portion 351 and the bearing portion 357 with respect to the compressive load, that is, the load acting per unit area is not extremely increased, the main shaft portion 351 and the bearing portion 357 are worn out. The length L of the bearing portion 357 necessary for receiving the position is inevitably determined.

  In the present embodiment, since the necessary length L of the bearing portion 357 is secured, it can sufficiently withstand the compressive load, and abnormal wear does not occur.

  On the other hand, in order to reduce the height of the compressor, in this embodiment, the leg portion 359a of the cylinder block 355 is shortened and the stator 305 is attached to the leg portion 359a with a bolt 359b. Further, since the thickness D of the support part 357a of the cylinder block 355 is reduced and the gap 304 between the upper end of the rotor 304 and the support part 357a of the cylinder block 355 is reduced, the rotor 304 is attached. The height can be lowered. Since the rotor 304 is moved upward while maintaining the length L of the bearing portion 357, the concave portion 367 of the rotor 304 is deepened, and the length of the boss portion 361 supporting the bottom surface is inevitably shortened. .

  However, the screw portion 353 of the main shaft portion 351 is screwed and fixed. The screw thread direction of the screw portion 353 is a direction in which a tightening force is generated during operation, and the nut 375 is attached to the screw portion 353 of the main shaft portion 351. By tightening, it becomes a double nut system, and a force that strongly presses between the boss portion 361 supporting the bottom surface and the nut 375 is generated, and a tensile force acts on the screw portion 353 of the main shaft portion 351 to increase the screw fixing force. Even when the torque fluctuation during back and forming is large, it can be securely fixed without loosening.

  Since the permanent magnet built in the main body 360 can reduce the size of the magnet itself by using the neodymium magnet 365 having a strong magnetic force, the thickness and height of the main body 360 can be further reduced. It was. Therefore, a compressor with high reliability and low overall height could be provided.

  The stator 305 is formed by concentrically winding a winding 453 around a tooth portion 451 that is a salient pole portion via an insulator (not shown), and each winding is also connected by a single connection line 454. Therefore, the winding 453 does not protrude from the iron core 452, and the overall height (dimensions H1, H2) of the winding end 456, which is the coil end portion, is also low.

  Accordingly, the stacking thickness of the main body 360 of the rotor 304 is reduced, and the overall height of the winding end 456 is also low, so that a compressor having a very low overall height can be realized.

  Furthermore, the use of a non-magnetic brass material for the boss portion 361 that supports the bottom surface can significantly reduce the leakage of magnetic flux to the screwing and fixing, so that the efficiency of the electric element and the compressor can be increased.

  As described above, the compressor according to the present invention can provide a compressor having a high reliability and a low overall height, such as a refrigerator for home use, a dehumidifier, a showcase, a vending machine, an air conditioner, etc. It can also be applied to applications.

Sectional drawing of the hermetic type electric compressor in Embodiment 1 of this invention 1 is an enlarged view of the main part of FIG. Plan view of concentrated winding stator in the same embodiment External view of concentrated winding stator in the same embodiment Sectional drawing of the hermetic type electric compressor in Embodiment 2 of this invention Enlarged view of the main part of FIG. Plan view of concentrated winding stator in the same embodiment External view of concentrated winding stator in the same embodiment Sectional view of a conventional hermetic electric compressor

Explanation of symbols

101, 301 Sealed container 103, 303 Electric element 104, 304 Rotor 105, 305 Stator 106, 306 Compression element 150, 350 Crankshaft 151, 351 Main shaft part 152, 352 Eccentric part 153, 353 Screw part 160, 360 Main body Part 161,361 Boss part 165,365 Permanent magnet 251,451 Projection part 253,453 Winding 375 Nut

Claims (5)

  An electric element including a stator and a rotor and a compression element driven by the electric element are housed in a container, and the compression element fixes the crankshaft having a main shaft portion and an eccentric portion and the stator. And a cylinder block formed with a bearing portion that pivotally supports the main shaft portion, and the rotor has a substantially cylindrical shape, a main body portion that houses a permanent magnet, an internal thread portion on the inner diameter, and a bottom surface of the main body portion And a boss portion that supports the screw shaft, a screw portion is provided on the main shaft portion of the crankshaft, and the rotor is fixed to the crankshaft by screwing the boss portion. Machine.   The hermetic electric compressor according to claim 1, wherein the boss portion is screwed to the screw portion of the main shaft portion by a double nut method.   2. The hermetic electric compressor according to claim 1, wherein the main body of the rotor is formed of silicon steel plates laminated, and the boss is formed of a nonmagnetic material.   The hermetic electric compressor according to claim 1, wherein the electric element is a salient pole concentrated winding type in which windings are wound around a plurality of protrusions of a stator core constituting the stator via an insulator.   The hermetic electric compressor according to any one of claims 1 to 4, wherein the permanent magnet housed in the main body of the rotor is made of rare earth.

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