JPWO2016006229A1 - Hermetic compressor and refrigeration apparatus using the same - Google Patents

Abstract

It is a hermetic compressor, and an electric element (104) and a compression element (106) driven by the electric element (104) are accommodated in an airtight container (102). The compression element (106) includes a shaft (126) composed of a main shaft (136) and an eccentric shaft (134), a bearing (144) that supports the main shaft (136) of the shaft (126), and a cylinder (142). A cylinder block (128). Moreover, the piston (130) which reciprocates within a cylinder and the connection part (132) which connects an eccentric shaft (134) and a piston (130) are provided. The electric element (104) includes a stator (150), and a rotor (152) arranged so as to surround the outer periphery of the stator (150) and coaxially with the stator (150). An outer rotor type motor. The stator (150) is fixed to the outer peripheral surface (162) of the bearing (144) with an adhesive (163).

Description

  The present invention relates to a hermetic compressor and a refrigeration apparatus such as a home electric refrigerator-freezer and a showcase using the same.

  In recent years, with the diversification of foodstuffs, there is an increasing demand for an increase in the internal volume of an electric refrigerator-freezer for home use. As one method for expanding the internal volume while maintaining the external dimensions of an electric refrigerator-freezer for home use, downsizing of a machine room that houses a hermetic compressor is being promoted. For hermetic compressors used in household electric refrigerator-freezers and other refrigeration cycle devices, there is a strong demand for miniaturization and low profile.

  Conventionally, this type of hermetic compressor uses an outer rotor type motor suitable for downsizing and thinning instead of an inner rotor type motor in order to reduce size and height (for example, patents) Reference 1). In the inner rotor type motor, the rotor rotates inside the stator as an electric element. In the outer rotor type motor, the rotor rotates outside the stator.

  FIG. 7 is a side view showing a bearing mechanism and an electric element of a conventional hermetic compressor (see Patent Document 1).

  As shown in FIG. 7, the conventional hermetic compressor includes a shaft 8 including a main shaft 4 and an eccentric shaft 6, and a bearing 10 that supports the main shaft 4. Sliding portions 12 and 14 are formed on the outer peripheral surface of the main shaft 4 and the inner peripheral surface of the bearing 10, respectively.

  The electric element 18 is an outer rotor type motor that includes a stator 20 and a rotor 22 that surrounds the stator 20 and is arranged coaxially with the stator 20.

  The stator 20 is fixed to the outer peripheral surface 23 of the bearing 10 by welding, shrink fitting, press fitting, or the like. There is a sliding portion 14 on the inner periphery of the bearing 10 to which the stator 20 is fixed.

  In the rotor 22, a permanent magnet 28 is disposed at the outer peripheral end portion 26 of the disk-shaped frame 24. The rotor 22 is fixed to the outer periphery of the lower end of the shaft 8 by shrink fitting or the like by a cylindrical rotor shaft hole 30 formed at the center of the frame 24.

  However, in the conventional configuration described in Patent Document 1, the stator 20 is fixed to the outer peripheral portion 23 of the bearing 10 by welding, shrink fitting, press fitting, or the like. For this reason, the conventional configuration has a problem that the inner peripheral surface of the bearing 10 to which the stator 20 is fixed is deformed, and solid contact occurs with the sliding portion 12 of the main shaft 4 and wears easily. ing.

German Patent Application No. 102010051266

  The present invention solves the conventional problems. The present invention avoids solid contact between the bearing and the main shaft by reducing the deformation of the inner peripheral surface of the fixed bearing when the stator is fixed to the outer peripheral surface of the bearing, thereby generating wear. To prevent. Accordingly, an object of the present invention is to provide a highly durable hermetic compressor.

  The hermetic compressor of the present invention accommodates an electric element and a compression element driven by the electric element in an airtight container. The compression element includes a shaft composed of a main shaft and an eccentric shaft, a cylinder block having a bearing and a cylinder that supports the main shaft of the shaft, a piston that reciprocates in the cylinder, an eccentric shaft, and a piston. A connecting portion to be connected. The electric element is an outer rotor type motor that includes a stator and a rotor that is disposed coaxially with the stator so as to surround the outer periphery of the stator. The stator is fixed to the outer peripheral surface of the bearing with an adhesive.

  Thereby, deformation of the inner peripheral surface of the bearing that occurs when the stator is fixed to the outer peripheral surface of the bearing can be reduced. Therefore, solid contact generated between the bearing and the main shaft can be avoided to prevent wear.

  In the hermetic compressor of the present invention, since the stator is fixed to the outer peripheral surface of the bearing with an adhesive, deformation of the inner peripheral surface of the bearing is reduced as compared with the case where the stator is fixed by welding, shrink fitting, press fitting, or the like. it can. Thereby, the solid contact which generate | occur | produces between a bearing and a main shaft can be avoided, and generation | occurrence | production of wear can be prevented. Therefore, the durability of the hermetic compressor can be improved.

FIG. 1 is a cross-sectional view of a hermetic compressor according to Embodiment 1 of the present invention. FIG. 2 is an enlarged cross-sectional view showing a fixed portion of the stator and the bearing of the hermetic compressor according to the first embodiment of the present invention. FIG. 3 is a bottom view of the stator and the bearing of the hermetic compressor according to the first embodiment of the present invention as seen from below. FIG. 4 is another enlarged cross-sectional view showing a fixed portion of the stator and the bearing of the hermetic compressor according to Embodiment 1 of the present invention. FIG. 5 is another enlarged cross-sectional view showing a fixed portion of the stator and the bearing of the hermetic compressor according to the first embodiment of the present invention. FIG. 6 is a schematic diagram showing a refrigeration apparatus according to Embodiment 2 of the present invention. FIG. 7 is a side view showing a bearing mechanism and an electric element of a conventional hermetic compressor.

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

(Embodiment 1)
FIG. 1 is a cross-sectional view of a hermetic compressor according to Embodiment 1 of the present invention. FIG. 2 is an enlarged cross-sectional view showing a fixed part of the stator and the bearing of the hermetic compressor. FIG. 3 is a bottom view of the stator and the bearing of the hermetic compressor as viewed from below.

  In FIG. 1, the hermetic compressor in the present embodiment includes a compressor body 108 including an electric element 104 and a compression element 106 inside a hermetic container 102 formed by drawing a steel plate. The compression element 106 is driven by the electric element 104.

  The compressor body 108 is elastically supported by a suspension spring 120.

  Further, in the sealed container 102, the refrigerant gas 122 is sealed at a relatively low temperature at a pressure equivalent to that of the low pressure side of the refrigeration apparatus (not shown). The refrigerant gas 122 is, for example, hydrocarbon-based R600a having a low global warming potential. Lubricating oil 124 is sealed in the inner bottom portion of the sealed container 102.

  The compression element 106 includes a shaft 126, a cylinder block 128, a piston 130, a connecting portion 132, and the like.

  The shaft 126 includes an eccentric shaft 134, a main shaft 136, and an oil supply mechanism 138 that supplies the oil 124 from the lower end of the main shaft 136 immersed in the oil 124 to the upper end of the eccentric shaft 134.

  The cylinder block 128 is formed integrally with a cylinder 142 that forms the compression chamber 140 and a bearing 144 that rotatably supports the main shaft 136.

  The main shaft 136 has a non-sliding portion 146 formed by hollowing out the outer diameter of the main shaft 136 at a part of the sliding portion 137 with the inner peripheral surface 164 of the bearing 144. Further, the non-sliding portion 146 of the main shaft 136 is disposed between the upper end and the lower end of the bearing 144.

  The electric element 104 is an outer rotor type motor that includes a stator 150 and a rotor 152 that surrounds the stator 150 and is arranged coaxially with the stator 150.

  In the rotor 152, a permanent magnet 158 is disposed at the outer peripheral end 156 of the disk-shaped frame 154. A cylindrical rotor shaft hole 160 formed at the center of the frame 154 is fixed to the outer periphery of the lower end of the main shaft 136 by press-fitting, welding, or shrink fitting.

  As is apparent from the enlarged sectional view of FIG. 2, the stator 150 is provided with a fitting portion 167 and a fitting portion 169 on the upper end surface 165 and the lower end surface 166, respectively. Further, the inner peripheral surface of the stator 150 other than the fitting portion 167 and the fitting portion 169 has an inner diameter larger than that of the fitting portion 167 and the fitting portion 169, and takes a certain gap from the outer peripheral surface 162 of the bearing 144. ing.

  Here, as shown in FIG. 3, the fitting portion 169 of the stator 150 has an opening that opens in a gap between the inner peripheral surface other than the fitting portion 167 and the fitting portion 169 and the outer peripheral surface 162 of the bearing 144. 170 is provided. The stator 150 is fixed to a gap between the outer peripheral surface 162 of the bearing 144 and the inner peripheral surface of the stator 150 with an adhesive 163 excellent in heat resistance such as an epoxy system poured from the opening 170. Yes.

  The bearing 144 is made of an iron-based material containing carbon.

  The bearing 144 is made of an iron-based material having a carbon content of 1% or more and 10% or less in order to improve slidability and seizure resistance with the main shaft 136 and to ensure strength.

  When the material of the bearing 144 is iron and the carbon content is 1% or more, it is difficult to fix the stator 150 to the bearing 144 by welding because the bearing 144 becomes brittle during welding. However, with the method of fixing with the adhesive 163, the stator 150 can be stably fixed to the bearing 144. As the carbon content increases, the material becomes brittle. Therefore, the carbon content is usually preferably up to 7%.

  In addition, when the stator 150 is fixed to the bearing 144 by welding, since the bearing 144 is an iron-based material having a carbon content of 1% or more, the bearing 144 becomes brittle during welding and cannot be easily fixed. In this embodiment, since the stator 150 is fixed to the bearing 144 with the adhesive 163, the bearing 144 can be stably fixed even with an iron-based material having a carbon content of 1% or more.

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

  When the electric element 104 is energized, a current flows through the stator 150, a magnetic field is generated, and the rotor 152 fixed to the main shaft 136 rotates. The shaft 126 is rotated by the rotation of the rotor 152. The piston 130 reciprocates in the cylinder 142 through a connecting portion 132 that is rotatably attached to the eccentric shaft 134. Thus, the compression element 106 performs a predetermined compression operation.

  Next, the operation and effect in which the stator 150 is fixed to the outer peripheral surface 162 of the bearing 144 with the adhesive 163 will be described.

  The stator 150 of the outer rotor type motor as in the present embodiment is usually fixed to the outer peripheral surface 162 of the bearing 144 by press fitting, welding, shrink fitting or the like. For this reason, the inner peripheral surface 164 of the bearing 144 at the position where the stator 150 is fixed is deformed, and solid contact is easily generated between the sliding portion 137 of the main shaft 136 and the stator 150, and wear easily occurs.

  However, since the stator 150 of the hermetic compressor according to the present embodiment is fixed to the outer peripheral surface 162 of the bearing 144 with the adhesive 163, an excessive force is applied to the bearing 144 such as press fitting, welding, or shrink fitting. Will not work. Therefore, it is possible to suppress the occurrence of distortion on the inner peripheral surface 164 of the bearing 144.

  Therefore, solid contact between the inner peripheral surface 164 of the bearing 144 and the sliding portion 137 of the main shaft 136 can be avoided, and occurrence of wear can be prevented. Therefore, the durability of the hermetic compressor can be improved.

  Even if the adhesive 163 is interposed between the inner peripheral surface of the stator 150 and the outer peripheral surface 162 of the bearing 144, the inner peripheral surface of the bearing can be obtained by the fitting portion 167 and the fitting portion 169 of the stator 150. 164 and the deterioration of the coaxiality of the outer peripheral surface of the stator 150 can be suppressed. Therefore, the gap between the stator 150 and the rotor 152 can be kept uniform. Therefore, the efficiency of the hermetic compressor is improved.

  Furthermore, the inner peripheral surface other than the fitting portion 167 and the fitting portion 169 of the stator 150 has a certain gap with the outer peripheral surface 162 of the bearing 144. The fitting portion 169 is provided with an opening 170 that opens in a gap between the inner peripheral surface of the stator 150 and the outer peripheral surface 162 of the bearing 144. Thus, the adhesive 163 can be easily sealed from the opening 170 into the gap between the inner peripheral surface of the stator 150 and the outer peripheral surface 162 of the bearing 144. Therefore, productivity is improved. Further, the stator 150 and the bearing 144 can be securely fixed.

  In this embodiment, the opening 170 is provided in the fitting portion 169 of the stator 150. However, the same effect can be obtained by providing the opening 170 in the fitting portion 167.

  In the present embodiment, a plurality of openings 170 may be provided. Thereby, the ease of encapsulating the adhesive 163 is further improved.

  FIG. 4 is another enlarged cross-sectional view showing a fixed portion between stator 150 and bearing 144 of the hermetic compressor according to Embodiment 1 of the present invention. In FIG. 4, a gap for sealing the adhesive 163 is provided on the bearing 144 side. Thereby, the electromagnetic steel plate of the stator 150 can be made into the same shape.

  FIG. 5 is still another enlarged cross-sectional view showing a fixed portion between stator 150 and bearing 144 of the hermetic compressor according to Embodiment 1 of the present invention. In FIG. 5, the upper side of the paper surface is the upper side of the stator 150. In FIG. 5, the fitting portion 167 is provided in the upper half of the stator 150. Thereby, the adhesive 163 can be easily put.

  As described above, the hermetic compressor of the present embodiment accommodates the electric element 104 and the compression element 106 driven by the electric element 104 in the hermetic container 102. The compression element 106 also includes a shaft 126 composed of a main shaft 136 and an eccentric shaft 134, and a cylinder block 128 having a bearing 144 and a cylinder 142 that support the main shaft 136 of the shaft 126. The compression element 106 includes a piston 130 that reciprocates within the cylinder 142, and a connecting portion 132 that connects the eccentric shaft 134 and the piston 130. The electric element 104 is an outer rotor type motor including a stator 150 and a rotor 152 disposed so as to surround the outer periphery of the stator 150 and coaxially with the stator 150. The stator 150 is fixed to the outer peripheral surface 162 of the bearing 144 with an adhesive 163.

  Thereby, the deformation | transformation of the internal peripheral surface 164 of the bearing 144 which fixed the stator 150 can be reduced. Thereby, the solid contact which generate | occur | produces between the bearing 144 and the main shaft 136 can be avoided, and generation | occurrence | production of wear can be prevented. Therefore, the durability of the hermetic compressor can be improved.

  In addition, fitting portions 167 and 169 that fit with the outer peripheral surface 162 of the bearing 144 may be provided in a part of the inner peripheral portion of the stator 150. Thereby, even if the adhesive 163 is interposed between the inner peripheral portion of the stator 150 and the outer peripheral surface 162 of the bearing 144, the deterioration of the coaxiality between the inner peripheral portion of the bearing 144 and the outer peripheral surface of the stator 150 is suppressed, The gap between the stator 150 and the rotor 152 can be kept uniform. Therefore, the efficiency of the hermetic compressor can be improved.

  Further, the fitting portions 167 and 169 are provided on the upper end surface 165 and the lower end surface 166 of the stator 150, and a gap is provided between the inner peripheral portion of the stator 150 other than the fitting portions 167 and 169 and the outer peripheral surface 162 of the bearing 144. May be. Thereby, it becomes easy to enclose the adhesive 163 between the inner peripheral portion of the stator 150 and the outer peripheral surface 162 of the bearing 144. Therefore, the outer peripheral surface 162 of the bearing 144 and the stator 150 can be reliably fixed.

  Further, the adhesive 163 and the oil 124 are separated by the fitting portions 167 and 169. As a result, it is possible to prevent the oil 124 from attacking the adhesive 163, to suppress the deterioration of the adhesive 163 itself, and to suppress the generation of substances that adversely affect the oil 124 and the refrigerant gas 122 from the adhesive 163. . As a result, the reliability of the hermetic compressor can be improved.

  Further, the fitting portions 167 and 169 may be provided with an opening 170 that opens in a gap between the inner peripheral portion of the stator 150 and the outer peripheral surface 162 of the bearing 144. Thereby, the adhesive 163 can be easily injected into the gap provided in the inner peripheral portion of the stator 150 and the outer peripheral surface 162 of the bearing 144. Therefore, productivity can be improved.

  A plurality of openings 170 may be provided. Thereby, the ease of encapsulating the adhesive 163 is further improved.

  Further, a gap may be provided on the bearing 144 side. Thereby, the electromagnetic steel plate of the stator 150 can be made into the same shape.

  Further, the fitting portion 167 may be provided in the upper half of the stator 150 on the eccentric shaft side. Thereby, the adhesive 163 can be easily put.

  Further, the bearing 144 may be an iron-based material containing carbon. Thereby, the bearing 144 can ensure the improvement of the slidability and seizure resistance with the main shaft 136 and the strength.

  Further, the bearing 144 may contain 1% or more and 7% or less of carbon. Thereby, the stator 150 can be stably fixed to the bearing 144.

(Embodiment 2)
FIG. 6 is a schematic diagram showing a refrigeration apparatus according to Embodiment 2 of the present invention. Here, in the refrigeration apparatus, the hermetic compressor described in Embodiment 1 is mounted on the refrigerant circuit 310. An outline of the basic configuration of the refrigeration apparatus will be described.

  In FIG. 6, the refrigeration apparatus includes a main body 302 formed of a heat-insulating box having an opening with a door, a partition wall 308 that partitions the inside of the main body 302 into an article storage space 304 and a machine room 306, and storage. And a refrigerant circuit 310 that cools the inside of the space 304.

  The refrigerant circuit 310 has a configuration in which the compressor 312 that is the hermetic compressor described in the first embodiment, the radiator 314, the decompression device 316, and the heat absorber 318 are connected in a ring shape. The heat absorber 318 is disposed in a storage space 304 provided with a blower (not shown). The cooling heat of the heat absorber 318 is agitated so as to circulate in the storage space 304 by the blower, as shown by an arrow in FIG. 6, and the storage space 304 is cooled.

  The refrigeration apparatus described above includes the compressor 312 that is the hermetic compressor described in the first embodiment. That is, the compressor 312 suppresses distortion generated on the inner peripheral surface 164 of the bearing 144 by fixing the stator 150 to the outer peripheral surface 162 of the bearing 144 with the adhesive 163. Further, solid contact between the inner peripheral surface 164 of the bearing 144 and the main shaft 136 is avoided. Therefore, a highly durable hermetic compressor that prevents the occurrence of wear is provided. Therefore, the durability of the refrigeration apparatus can be improved.

  As described above, the refrigeration apparatus of the present embodiment includes the refrigerant circuit 310 in which the compressor 312, the radiator 314, the decompression device 316, and the heat absorber 318 are connected in a ring shape by piping. Further, the compressor 312 may be the hermetic compressor described in the first embodiment. Thereby, the performance and durability of the refrigeration apparatus can be improved.

  As described above, the present invention can provide a highly durable hermetic compressor and refrigeration apparatus. Therefore, the present invention is not limited to home use such as an electric refrigerator or an air conditioner, and can be widely applied to refrigeration apparatuses such as commercial showcases and vending machines.

DESCRIPTION OF SYMBOLS 102 Airtight container 104 Electric element 106 Compression element 108 Compressor main body 120 Suspension spring 122 Refrigerant gas 124 Oil 126 Shaft 128 Cylinder block 130 Piston 132 Connection part 134 Eccentric shaft 136 Main shaft 137 Sliding part 138 Oil supply mechanism 140 Compression chamber 142 Cylinder 144 Bearing 146 Non-sliding portion 150 Stator 152 Rotor 154 Frame 156 Outer peripheral end 158 Permanent magnet 160 Rotor shaft hole 162 Outer peripheral surface 163 Adhesive 164 Inner peripheral surface 165 Upper end surface 166 Lower end surface 167, 169 Fitting portion 170 Opening portion 302 Main body 304 Storage space 306 Machine room 308 Partition wall 310 Refrigerant circuit 312 Compressor 314 Radiator 316 Pressure reducing device 318 Heat absorber

Claims (10)

In an airtight container, an electric element and a compression element driven by the electric element are accommodated,
The compression element is
A shaft composed of a main shaft and an eccentric shaft;
A cylinder block having a bearing and a cylinder for supporting the main shaft of the shaft;
A piston that reciprocates within the cylinder;
A connecting portion for connecting the eccentric shaft and the piston,
The electric element is
An outer rotor type motor comprising a stator and a rotor arranged so as to surround the outer periphery of the stator and coaxially with the stator; and
A hermetic compressor in which the stator is fixed to the outer peripheral surface of the bearing with an adhesive. The hermetic compressor according to claim 1, wherein a fitting portion that fits with an outer peripheral surface of the bearing is provided in a part of the inner peripheral portion of the stator. The hermetic seal according to claim 2, wherein the fitting portion is provided on an upper end surface and a lower end surface of the stator, and a gap is provided between an inner peripheral portion of the stator other than the fitting portion and an outer peripheral surface of the bearing. Mold compressor. The hermetic compressor according to claim 3, wherein the fitting portion is provided with an opening that opens in a gap between an inner peripheral portion of the stator and an outer peripheral surface of the bearing. The hermetic compressor according to claim 4, wherein a plurality of the openings are provided. The hermetic compressor according to claim 3, wherein the gap is provided on the bearing side. The hermetic compressor according to claim 2, wherein the fitting portion is provided in an upper half of the stator on the eccentric shaft side. The hermetic compressor according to claim 1, wherein the bearing is an iron-based material containing carbon. The hermetic compressor according to claim 8, wherein the bearing contains 1% or more and 7% or less of the carbon. A refrigerating apparatus having a refrigerant circuit in which a compressor, a radiator, a decompressor, and a heat absorber are connected in an annular shape by piping, and the compressor is the hermetic compressor according to any one of claims 1 to 9. .

Images