JP2005269695A - Enclosed motor-driven compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the cost of a motor element employed in an enclosed motor-driven compressor. <P>SOLUTION: The rotor 104 is provided with a body 200 for containing a neodymium magnet 202, a boss 207 formed in the body 200 to extend a bearing 155, and a latch 201 projecting to the opposite side of a cylinder block 153 and having an outside diameter smaller than the body 200 and the inside diameter fitted over a main spindle 151. Since the height of the body 200 can be reduced while ensuring the sliding length of the bearing 155 and a fitting margin at the fitting part of the rotor 104, the height of a concentrated winding stator 105 can be lowered and the cost can be reduced. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a hermetic electric compressor used in a refrigeration cycle apparatus such as a household refrigerator-freezer, a vending machine, and an air conditioner.

Conventionally, this type of hermetic electric compressor includes an electric element composed of a stator and a rotor and a compression element driven by the electric element in a hermetic container. (For example, see Patent Document 1)
Hereinafter, the above-described hermetic electric compressor will be described with reference to the drawings.

  FIG. 9 shows 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 accommodated 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 as a stator. 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 includes a main shaft portion 8 that engages and 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 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 cylinder block 10 by bolts 16 via 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 fitting portion 17 and a recessed boss portion 18, and the fitting portion 17 and the boss portion 18 have a cylindrical shape in order to extend the life of a die for punching a silicon steel plate. The rotor 4 is locked to the main shaft portion 8 at the fitting portion 17, the bearing portion 12 extends to the boss portion 18, and has a substantially cylindrical shape.

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

By energizing the concentrated winding stator 5, the rotor 4 rotates. The rotor 4 rotates the crankshaft 7 via the fitting portion 17. 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, whereby the piston 13 reciprocates in the compression chamber 11 to continuously compress refrigerant gas (not shown).
JP 2003-158846 A

  However, in the above-described conventional configuration, the compressive load received by the piston 13 finally acts on the bearing portion 12, so that the sliding length of the bearing portion 12 needs to be a sliding length that can withstand the load. Therefore, it is necessary to prevent the surface pressure of the bearing portion 12 from excessively increasing.

  On the other hand, the rotor 4 is usually fixed to the main shaft portion 8 by press-fitting or shrink fitting, and the axial length of the rotor 4 that can be locked to the main shaft portion 8 is required.

  For these reasons, the height of the rotor 4, that is, the length in the axial direction cannot be reduced, and the amount of silicon steel sheet used cannot be reduced, so that it is difficult to reduce costs. It was.

  The present invention solves the above-described conventional problems, and an object of the present invention is to provide a low-cost hermetic electric compressor by using a rotor having a low thickness of a portion that stores a permanent magnet.

  In order to solve the above-described conventional problems, a hermetic electric compressor according to the present invention includes a main body portion that is substantially cylindrical and that stores a permanent magnet, a boss portion that is recessed in the main body portion and in which a bearing portion extends, A rotor that has a locking part that protrudes on the cylinder block side and has an outer diameter smaller than that of the main body part and an inner diameter part that fits and locks to the main shaft part, ensuring the sliding length of the bearing part. At the same time, there is an effect that the rotor can be fitted and locked with the main shaft portion, and the height can be reduced by reducing the stack thickness of the rotor main body portion.

  The hermetic electric compressor according to the present invention has a substantially cylindrical main body portion that houses a permanent magnet, a boss portion that is recessed in the main body portion and extends a bearing portion, and is provided on the side opposite to the cylinder block and has an outer diameter. By using a rotor that has a smaller inner diameter than the main body part and a locking part that fits and locks to the main shaft part, and that has a lower body thickness of the main body part that stores the permanent magnet, the cost is reduced. Can be reduced.

  According to the 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 accommodated in a sealed container, and the compression element includes a main shaft portion and an eccentric portion. And a crank block that fixes the rotor to the main shaft portion and a cylinder block that forms a bearing portion that fixes the stator and pivotally supports the main shaft portion, and the rotor is substantially cylindrical. A main body portion for storing the permanent magnet, a boss portion recessed in the main body portion and extending the bearing portion, and an outer diameter smaller than the main body portion projecting on the side opposite to the cylinder block, the inner diameter portion being the main shaft It has a locking part fitted and locked to the part, and the body part is provided with a boss part to extend the bearing part to the boss part, thereby ensuring the sliding length of the bearing part and the main body. Fits to the main shaft part separately from the part Sealed is by providing the locking portion can the product thickness of the body portion of the rotor low, it is possible to reduce the cost of the hermetic electric compressor.

  The invention according to claim 2 is the invention according to claim 1, wherein the main body portion and the locking portion are formed of a laminated silicon steel sheet, and the outer diameter of the locking portion is smaller than the inner diameter of the boss portion. By adopting the dimensions, since the locking portion can be manufactured from the inner diameter punched material of the boss portion, no special member is required, and the cost of the hermetic electric compressor can be further reduced.

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

  According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the salient pole concentration is obtained by winding a winding directly on a plurality of salient pole portions of the stator core via an insulator. Since the coil end portion can be lowered by using the wound stator, the electric element and the hermetic electric compressor can be reduced in size.

  The invention according to claim 5 is the invention according to any one of claims 1 to 4, wherein the permanent magnet housed in the rotor is made of a rare earth permanent magnet, whereby the permanent magnet can be made smaller and rotated. Since the child height can be further reduced, the hermetic electric compressor can be further reduced in size.

  The invention according to claim 6 is the invention according to any one of claims 1 to 5, wherein the balance weight portion is formed integrally with the locking portion, so that the piston can be reciprocated without adding a special member. Since the seismic force due to movement can be reduced, vibration of the hermetic electric compressor can be reduced.

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

(Embodiment 1)
FIG. 1 is a cross-sectional view of a hermetic electric compressor according to Embodiment 1 of the present invention. FIG. 2 is a development view of the rotor in the embodiment, and FIG. 3 is a perspective view of the rotor in the embodiment. 4 is a plan view of the concentrated winding stator in the embodiment, and FIG. 5 is an external view of the concentrated winding stator in the embodiment.

  Hereinafter, embodiments of the present invention 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 concentrated winding stator 105 as a stator. 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 a sealed container 101 and supported by a spring 107. A terminal 108 constituting the sealed container 101 communicates electricity (not shown), and supplies electricity to the electric element 103 through a lead wire 109.

  Next, details of the compression element 106 will be described below.

  The crankshaft 150 has a main shaft portion 151 in which the rotor 104 is press-fitted and fixed, and an eccentric portion 152 formed eccentrically with respect to the main shaft portion 151. The cylinder block 153 includes a substantially cylindrical compression chamber 154 and a bearing portion 155 that supports the main shaft portion 151 and is formed above the electric element 103.

  The piston 156 is fitted into the compression chamber 154 and is connected to the eccentric portion 152 by the connecting means 157.

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

  The rotor 104 includes a main body part 200 and a locking part 201. The main body 200 is formed by laminating the main body silicon steel sheet 203 having the hole 208 and accommodates the neodymium magnet 202, which is a rare earth magnet material, in the hole 208. Further, a top plate 205 and a bottom plate 206 that prevent the neodymium magnet 202 from falling off are welded and fixed to both end faces of the main body 200.

  Moreover, the main body part 200 has a boss part 207 for extending the bearing part 155, and the main body part 200 is also formed by laminating silicon steel plates. The locking portion silicon steel plate 204 forming the locking portion 201 is formed of a scrap material obtained by punching the main body silicon steel plate 203 forming the boss portion 207. Therefore, the outer diameter of the locking portion silicon steel plate 204 that forms the locking portion 201 is smaller than the inner diameter of the main body silicon steel plate 203 that forms the boss portion 207. Further, the inner diameter and the outer diameter of the locking portion silicon steel plate 204 are the same.

  The main body portion 200 and the locking portion 201 are welded and fixed with a bottom plate 206 so that the inner diameter axis is the same. The rotor 104 is press-fitted and fixed to the main shaft portion 151 by a locking portion 201.

  The stator core 250 constituting the concentrated winding stator 105 is formed by laminating an annular core core 252 in which teeth portions 251 are formed at predetermined intervals, and a winding 253 is wound around the teeth portion 251. It has been. The connection line 254 connects the windings with one line. The winding 253 has dimensions H1 and H2 from the end face of the stator core 250 and protrudes as a winding end 256 that is a coil end portion.

  The concentrated winding stator 105 is fixed to the cylinder block 153 with bolts 255 via the stator core 250.

  The operation and action of the hermetic electric compressor configured as described above will be described below.

  When electricity (not shown) is supplied to the terminal 108, the concentrated winding stator 105 is energized through the lead wire 109, and the rotor 104 rotates at an arbitrary number of rotations due to the magnetic field generated thereby. The rotor 104 rotates the crankshaft 150, and the eccentric movement of the eccentric portion 152 drives the piston 156 via the connecting means 157, whereby the piston 156 reciprocates in the compression chamber 154, and a refrigerant (not shown) ) Continuously.

  At this time, the compressive load acting on the piston 156 when compressing the refrigerant acts on the eccentric portion 152 from the piston 156 via the connecting means 157 and is received by the bearing portion 155 by the main shaft portion 151.

  In the configuration as shown in FIG. 9 of the related art, when receiving a compressive load, unless the surface pressure of the bearing portion 12 with respect to the compressive load, that is, the load acting on the unit area does not become extremely large, The sliding part of the bearing part 12 will be worn out.

  However, in the present embodiment, since the bearing portion 155 extends to the boss portion 207 provided in the rotor 104, the surface pressure can be reduced by providing a sliding length that can sufficiently withstand the compressive load. The sliding length which can sufficiently withstand the compressive load acting on the piston 156 is secured. Therefore, the bearing portion 155 can maintain high reliability.

  On the other hand, in the main body of the rotor 104, the press-fitting length into the main shaft portion 151 is extremely reduced by providing the boss portion 207, but the locking portion silicon steel plate 204 made of scrap material punched from the main body silicon steel plate 203 is used. By providing the locking portion 201, a sufficient press-fitting length can be ensured.

  Therefore, the rotor 104 does not shift with respect to the main shaft portion 151 and does not fall off from the main shaft portion 151 due to the rotational force.

  And since the permanent magnet built in the main-body part 200 can reduce the magnitude | size of magnet itself by using the strong neodymium magnet 202, the thickness and height of the main-body part 200 can be made low.

  Further, the concentrated winding 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), and a single connecting line 254 is provided between each winding. Therefore, the protrusion of the winding 253 from the iron core 252 is small, and the overall height (dimensions H1, H2) of the winding end 256, which is the coil end portion, is also low.

  Therefore, since the thickness of the main body 200 of the rotor 104 is reduced and the overall height of the winding end 256 is also low, the hermetic container 101 can be made smaller and the hermetic electric compressor can be downsized. . Furthermore, since the locking part 201 uses the scrap material which punched the main-body-part silicon steel plate 203, it does not require a special member and can reduce cost.

  In the present embodiment, the main body silicon steel plate 203, the top plate 205, and the bottom plate 206 are fixed by welding. It goes without saying that similar actions and effects can be obtained even with other fixing methods.

(Embodiment 2)
6 is a cross-sectional view of a hermetic electric compressor according to the second embodiment of the present invention, FIG. 7 is a development view of the rotor in the same embodiment, and FIG. 8 is a perspective view of the rotor in the same embodiment.

  Hereinafter, the present embodiment will be described with reference to FIGS. In addition, about the same structure as Embodiment 1, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.

  6 to 8, the electric element 300 includes a rotor 301 and a concentrated winding stator 105. The compression element 106 is constructed above the electric element 300 and is driven by the electric element 300.

  Both the electric element 300 and the compression element 106 are accommodated in the hermetic container 101 and supported by a spring 107.

  Next, details of the electric element 300 will be described below.

  The electric element 300 includes a rotor 301 and a concentrated winding stator 105, and the rotor 301 includes a main body portion 200 and a locking portion 302. The main body 200 is formed by laminating main body silicon steel plates 203 having holes 208, and a top plate 205 and a bottom plate 206 that prevent the neodymium magnet 202, which is a rare earth permanent magnet, from falling off are welded to both surfaces of the main body 200, respectively. It is stuck.

  Further, the main body 200 has a boss 207 that extends the bearing 155. The locking portion 302 is made of a brass material that is a non-magnetic material, and the center of gravity of the locking portion 302 is displaced from the inner diameter axis of the locking portion 302. The main body 200 and the locking portion 302 are welded and fixed by the bottom plate 206 so that the inner diameter axis is the same, and the center of gravity of the locking portion 302 is the same as the eccentric portion 152 with respect to the main shaft 151. The rotor 301 is press-fitted and fixed to the main shaft 151 by a locking portion 302 so as to be eccentric in the direction.

  The operation and action of the hermetic electric compressor configured as described above will be described below.

  When electricity (not shown) is supplied to the terminal 108, the concentrated winding stator 105 is energized through the lead wire 109, and the rotor 301 rotates at an arbitrary number of rotations due to the magnetic field generated thereby. The rotor 301 rotates the crankshaft 150, and the eccentric movement of the eccentric portion 152 drives the piston 156 via the connecting means 157, whereby the piston 156 reciprocates in the compression chamber 154, and a refrigerant (not shown) ) Continuously.

  At this time, the compressive load acting on the piston 156 when compressing the refrigerant acts on the eccentric portion 152 from the piston 156 via the connecting means 157 and is received by the bearing portion 155 by the main shaft portion 151.

  In the configuration as shown in FIG. 9 of the related art, when receiving a compressive load, unless the surface pressure of the bearing portion 12 with respect to the compressive load, that is, the load acting on the unit area does not become extremely large, The sliding part of the bearing part 12 will be worn out.

  However, in the present embodiment, since the bearing portion 155 extends to the boss portion 207 provided in the rotor 104, the surface pressure can be reduced by providing a sliding length that can sufficiently withstand the compressive load. The sliding length which can sufficiently withstand the compressive load acting on the piston 156 is secured. Therefore, the bearing portion 155 can maintain high reliability.

  On the other hand, in the main body of the rotor 104, the press-fitting length to the main shaft 151 is extremely shortened by providing the boss part 207, but a sufficient press-fitting length is ensured by providing the locking part 302 made of brass. it can. Therefore, the rotor 104 does not shift with respect to the main shaft portion 151 and does not fall off from the main shaft portion 151 due to the rotational force.

  Furthermore, since the center of gravity of the locking portion 302 is offset from the inner diameter axis of the locking portion 302, the center of gravity of the locking portion 302 is eccentric with respect to the main shaft portion 151, and press-fitting into the main shaft portion 151 described above. In addition to the effect of ensuring the length, an effect as the balance weight portion 303 of the rotating body can be obtained.

  That is, the seismic force generated by the reciprocating motion of the piston 156 and the rotational motion of the eccentric portion 152 can be reduced, and the vibration of the hermetic electric compressor can be reduced.

  Furthermore, since the permanent magnet built into the main body 200 can reduce the size of the magnet itself by using the neodymium magnet 202 having a strong magnetic force, the height of the main body 200 can be reduced. Therefore, the sealed container 101 can be made small, and the miniaturization as a sealed electric compressor is possible.

  Further, the concentrated winding stator 105 is obtained by intensively winding the winding 253 around the tooth portion 251, and the windings 253 from the iron core 252 are connected to each other through a single connection line 254. There is little protrusion, and the total heights H1 and H2 of the winding end 256, which is the coil end portion, can also be lowered.

  Furthermore, since the locking portion 302 is made of a brass material which is a non-magnetic material, magnetic flux leakage to the locking portion 302 can be greatly reduced, so that the efficiency of the electric element and the hermetic electric compressor is increased. be able to.

  Therefore, it can be reduced in size as a hermetic electric compressor, and the highly efficient electric element 300 can be obtained by significantly reducing magnetic flux leakage to the locking portion 302. Furthermore, by shifting the center of gravity of the locking part 302 from the inner diameter axis of the locking part 302 and forming a balance weight, the seismic force due to the reciprocating motion of the piston can be mitigated without adding a special member, and vibration is reduced. can do.

  As described above, the hermetic electric compressor according to the present invention can reduce the size and cost by using a rotor having a low body thickness for storing a permanent magnet. It can also be applied to refrigeration cycle devices such as refrigerators, vending machines, and air conditioners.

Sectional drawing of the hermetic type electric compressor in Embodiment 1 of this invention Development view of rotor in the same embodiment The perspective view of the rotor in the same embodiment 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 Development view of rotor in the same embodiment The perspective view of the rotor in the same embodiment Sectional view of a conventional hermetic electric compressor

Explanation of symbols

DESCRIPTION OF SYMBOLS 101 Airtight container 103,300 Electric element 104,301 Rotor 105 Concentrated winding stator 106 Compression element 150 Crankshaft 151 Main shaft part 152 Eccentric part 153 Cylinder block 155 Bearing part 200 Main body part 201,302 Locking part 202 Neodymium magnet 207 Boss part 250 Stator core 303 Balance weight part

Claims (6)

An electric element composed of a stator and a rotor and a compression element driven by the electric element are accommodated in an airtight container. The compression element includes a main shaft portion and an eccentric portion, and the rotor is connected to the main shaft. And a cylinder block that forms a bearing portion that fixes the stator and supports the main shaft portion, and the rotor has a substantially cylindrical shape and houses a permanent magnet. A boss part that is recessed in the main body part and from which the bearing part extends, and a boss part that protrudes on the side opposite to the cylinder block and has an outer diameter smaller than that of the main body part and is fitted and locked to the main shaft part. A hermetic electric compressor having a stopper. 2. The hermetic electric compressor according to claim 1, wherein the main body portion and the locking portion are formed of laminated silicon steel plates, and the outer diameter of the locking portion is smaller than the inner diameter of the boss portion. The hermetic electric compressor according to claim 1, wherein the main body is formed of laminated silicon steel plates, and the locking portion is formed of a nonmagnetic material. The electric element is a salient pole concentrated winding type in which a winding is wound around a plurality of salient pole portions of a stator core constituting a stator via an insulator. Hermetic electric compressor. The hermetic electric compressor according to any one of claims 1 to 4, wherein the permanent magnet housed in the rotor is a rare earth permanent magnet. The hermetic electric compressor according to any one of claims 1 to 5, wherein the balance weight part is formed integrally with the locking part.

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