JP2008101558A - Hermetic compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce heat amount transmitted to surrounding air of a hermetic compressor from a stator through a sealed vessel to heat a refrigerant. <P>SOLUTION: A compression element 25, and a motor part 20 rotary driving the compression element and having a stator 2 and a rotor 3, are disposed in the sealed vessel 1 of the hermetic compressor30. The stator has a core 2a formed of a large number of approximately circular electromagnetic steel plates 2d, 2e different in diameter and two or more kinds. In the core, electromagnetic steel plates 2d with large maximum outer diameter out of the large number of electromagnetic steel plates and electromagnetic plates 2e with small maximum outer diameter, are alternately laminated to form insulated spaces. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a hermetic compressor, and more particularly to a hermetic compressor suitable for use in a refrigeration cycle.

  Examples of hermetic compressors used in conventional refrigeration cycles are described in Patent Document 1 and Patent Document 2. In the hermetic compressor described in Patent Document 1, refrigerant is sucked from a suction pipe provided below the hermetic container, is brought into contact with a drive motor to cool the motor, and flows to the compressor. At that time, a part of the refrigerant cools the inside of the slit along the outer peripheral surface formed in the stator core, and cools the stator core efficiently.

  In the said patent document 2, the compressed gas discharged in the airtight container from the compression element is made to flow in the gas channel formed in the outer peripheral part of an electrically driven element. The gas passage is formed by a first gas passage formed by a cutout portion formed by cutting out the outer peripheral surface of the electric element and an inner wall surface of the sealed container, and a through hole formed concentrically near the outer periphery of the electric element. It consists of two gas passages.

Japanese Patent Laid-Open No. 5-268740 JP 2002-213364 A

  In the hermetic compressors described in Patent Document 1 and Patent Document 2, the laminated electromagnetic steel sheets constituting the stator core of the electric motor have the same shape, and the shapes are matched in all layers when stacked. Combined. As a result, the outer diameter portions of all the electromagnetic steel plates are in contact with the inner diameter portion of the sealed container that houses the electric motor at the same circumferential position. In this case, when the electric motor is operated, the heat generated in the stator is easily transmitted to the air around the compression portion through the sealed container, and the heat generated in the stator does not sufficiently heat the refrigerant.

  The present invention has been made in view of the above-mentioned problems of the prior art, and its object is to reduce the amount of heat transferred from the stator to the ambient air of the hermetic compressor through the hermetic container, thereby contributing to heating of the refrigerant. There is.

  A feature of the present invention that achieves the above object is that in a hermetic compressor in which a compression element and an electric motor unit that rotationally drives the compression element and has a stator and a rotor are arranged in a hermetic container, the stator has many A plurality of laminated electromagnetic steel sheets are arranged above and below the first electromagnetic steel sheet having a contact portion that is arranged above and below to contact the inner wall of the sealed container. A second electromagnetic steel plate having a non-contact portion disposed between the first electromagnetic steel plates arranged and not in contact with the inner wall of the sealed container, and the first electromagnetic steel plate and the first electromagnetic wave arranged above and below the second electromagnetic steel plate The heat insulating space is formed by the second electromagnetic steel plate disposed between the steel plates and the sealed container.

  In this feature, the maximum diameter of the first electromagnetic steel sheet may be larger than the maximum diameter of the second electromagnetic steel sheet, and the first electromagnetic steel sheet and the second electromagnetic steel sheet have the same shape. A heat insulating space may be formed by changing the positions in the circumferential direction and laminating. Also, the first electromagnetic steel plate and the second electromagnetic steel plate may be alternately laminated, a plurality of the first electromagnetic steel plates are laminated, and the second electromagnetic steel plate is the number of laminations of the first electromagnetic steel plate. A plurality of different sheets may be stacked to form a heat insulating space.

  Another feature of the present invention that achieves the above object is to provide a hermetic compressor in which a compression element and an electric motor unit that rotationally drives the compression element and has a stator and a rotor are disposed in the hermetic container. Has an iron core formed of two or more types of substantially annular magnetic steel sheets with different outer diameters, and this iron core has the largest outer diameter among the many steel sheets, A heat insulating space is formed by alternately laminating electrical steel sheets having small outer diameters.

  Still another feature of the present invention that achieves the above object is to provide a hermetic compressor in which a compression element and an electric motor unit that rotationally drives the compression element and has a stator and a rotor are disposed in a hermetic container. The child has an iron core in which magnetic steel sheets are laminated. The magnetic steel sheet of the iron core has a substantially annular shape with three notches formed at an equal pitch on the outer peripheral portion. This is because the heat insulation space is formed by laminating the phases one by one.

  According to the present invention, in the hermetic compressor, the contact area between the stator and the hermetic container is reduced, and the heat insulation space is formed between the stator and the hermetic container. It is possible to reduce the amount of heat transferred to the ambient air of the machine and contribute to the heating of the refrigerant.

  Hereinafter, some embodiments of the hermetic compressor 30 of the present invention will be described with reference to the drawings. An embodiment of the hermetic compressor 30 will be described in detail with reference to FIGS. In FIG. 1, the longitudinal cross-sectional view of the hermetic compressor 30 arrange | positioned at the vertical axis | shaft is shown. FIG. 2 is a transverse cross-sectional view of FIG. 1 and shows an upper end surface portion of the electric motor unit 20 disposed in the upper part. 3 and 4 are plan views of two kinds of large and small electromagnetic steel plates 2d and 2e constituting the stator core of the hermetic compressor 30. FIG. FIG. 5 is a cross-sectional view taken along the line AA in FIG.

  In the hermetic compressor 30, the electric motor unit 20 including the stator 2 and the rotor 3 is disposed inside the hermetic container 1. The type of the motor unit 20 is a DC motor. The sealed container 1 is formed by covering both ends of a cylindrical tubular member with a bottom member and a lid member, and is made of a steel plate having a thickness of 2 to 5 mm. The electric motor unit 20 is disposed on the upper part of the sealed container 1.

  The rotating shaft 4 extends in the vertical direction and is fixed to the central portion of the stator 2 constituting the electric motor unit 20. In the stator 2, a plurality of electromagnetic steel plates 2d and 2e, the details of which will be described later, are laminated in the axial direction to form the stator core 2a. Each electromagnetic steel plate 2d has a ring shape, and six slots 2j are formed in the circumferential direction. A portion of the slot 2j is cut off on the inner peripheral side, and six I-shaped teeth 2b are formed on the inner peripheral side by each slot 2j. Each tooth 2b is wound with an enameled wire 2c forming a coil. The stator 2 is fixed to the sealed container 1 by tight fitting such as shrink fitting or welding.

  A compression element 25 is disposed below the electric motor unit 20. The compression element 25 is a rolling piston type compression element. The rotating body of the compression element 25 is fixed to the lower part of the rotating shaft 4. That is, an eccentric portion 4a is formed at the lower portion of the rotating shaft 4, and a roller 8 is fixed to the eccentric portion 4a. Opposing the upper and lower end surfaces of the roller 8, a main bearing 5 is disposed on the upper side, and a sub bearing 7 is disposed on the lower side. A cylinder 6 is disposed outside the roller 8 so as to be concentric with the rotating shaft 4. A vane 10 that partitions the space from the outside of the hermetic container 1 is inserted in the compression space 16 formed inside the cylinder 6 in the radial direction, and the coil spring 9 presses the vane 10 in the radial direction. is doing. When the rotating shaft 4 rotates, the roller 8 rotates eccentrically, and the volume of the compression space 16 changes.

In the hermetic compressor 30 configured as described above, when the motor unit 20 is energized, the stator 2 generates a rotating magnetic field, and the rotor 3 rotates. The rotation of the rotor 3 is transmitted to the compression element 25 by the rotating shaft 4, and the refrigerant gas is sucked from the suction pipe 11 communicating with the compression space 16. The refrigerant gas sucked into the compression space 16 changes the volume of the compression space 16 according to the rotation angle of the rotation shaft 4, and repeats the compression process every rotation of the rotation shaft 4. The high-pressure refrigerant gas compressed by the compression element 25 flows out from the compression space 16 to the space formed by the cover 12 covering the lower side of the cylinder 6 through the discharge port 17 formed in the auxiliary bearing 7. Here, a discharge valve that does not operate when the pressure of the compression space 16 is equal to or lower than a predetermined pressure is provided at the lower end portion of the discharge port 17, and prevents low-pressure refrigerant gas from flowing into the sealed container 1.

  Thereafter, the refrigerant gas reaches the lower part of the electric motor unit 20 through the flow path formed in the cylinder 6. Then, through a gap formed by the stator 2 and the rotor 3, and a refrigerant flow path formed in the stator 2 and the inner surface of the hermetic container 1, the fixing that generates heat due to copper loss and iron loss and becomes high temperature It absorbs the heat of the child 2 and cools it. The refrigerant heated by absorbing heat generated in the stator is discharged out of the machine from a discharge pipe 13 provided on the lid member of the hermetic container 1.

  By the way, in a heat pump heater using a refrigeration cycle, the hermetic compressor 30 is frequently used for the reason of downsizing and simplification of the apparatus. In the hermetic compressor 30, the stator 2 included in the electric motor unit 20 generates heat. If the refrigerant gas is heated using the generated heat, the capacity is improved during heating operation. This will be described with reference to the Mollier diagram shown in FIG.

  In the figure, the horizontal axis represents specific enthalpy and the vertical axis represents refrigerant gas pressure. This is the case of heating operation. When the stator 2 generates little heat and hardly heats the refrigerant, after the change from A to B, which is the compression process of the compressor, the refrigerant gas is condensed in the indoor heat exchanger, which is a condenser, B → Move to C. At the time of heat radiation in the condenser, a heat quantity proportional to the specific enthalpy difference Q between the condensation processes B-C is radiated.

  On the other hand, when the stator 2 generates heat and heats the refrigerant gas, the refrigerant gas absorbs heat generated in the stator 2 after the refrigerant gas is compressed in the compression process A → B. Therefore, when the refrigerant gas goes through the heating process B → B ′, the specific enthalpy increases by the amount of heat Q ′ added to the refrigerant gas from the stator 2. In this heat dissipation process B ′ → C, the heating capacity increases in proportion to the specific enthalpy difference (Q + Q ′) between the heat dissipation process B ′ → C.

  Thus, if the heat generated in the stator 2 of the electric motor 20 in the hermetic compressor 30 is efficiently absorbed by the refrigerant gas, the efficiency of the refrigeration cycle is improved. Therefore, in this embodiment, the stator 2 is configured as follows to improve the endothermic effect of the refrigerant gas. This state will be described with reference to FIGS.

  Two types of large and small electromagnetic steel plates 2d and 2e are prepared for the stator core 2a. Both the electromagnetic steel sheets 2d and 2e have a thickness of 0.2 mm to 0.4 mm and are formed by press punching. In the large electromagnetic steel sheet 2d having a large outer diameter, the outer peripheral portion corresponding to the six teeth 2b portions formed uniformly in the circumferential direction is cut out by a straight line to form a cutout portion 2f. The notch 2 f forms a refrigerant gas flow path 15 between the cutout portion 2 f and the closed vessel 1 when housed in the closed vessel 1. The small electrical steel sheet 2e having a small outer diameter has a circular outer peripheral portion, and has no notch or the like. The shape of the slot for forming the teeth 2b and the teeth 2b is the same for both large and small electromagnetic steel sheets 2d and 2e. When producing the stator core 2a, about 100 to 200 electromagnetic steel plates 2d and 2e are alternately laminated, and are joined together by riveting or caulking, welding or the like.

  The rotor 3 is formed by laminating about 100 to 200 substantially circular electromagnetic steel plates formed by press punching like the stator, and embedding a plurality of permanent magnets (not shown) in the laminated electromagnetic steel plates. Created. A hole used for fixing to the rotating shaft 4 is formed at the center of the electromagnetic steel plate of the rotor 3. The rotation of the rotor 3 is transmitted to the compression element 25 by the rotating shaft 4, and the roller 8 included in the compression element 25 is eccentrically rotated. The roller 8 rotates eccentrically, the refrigerant gas is sucked from the suction pipe 11, and the refrigerant gas is compressed. In this embodiment, R410A refrigerant is used, and ester oil is sealed inside the sealed container 1 as refrigeration oil.

In the hermetic compressor 30 of the present embodiment configured as described above, the flow of the refrigerant gas is as shown in FIG. That is, since the two kinds of large and small electromagnetic steel plates 2d and 2e are alternately laminated, the contact area between the stator 2 and the sealed container 1 is halved on the outer peripheral side. Specifically, the large electromagnetic steel plate 2d is in contact with the sealed container 1 at the outer peripheral portion except for the notch 2f. On the other hand, since the position of the radial direction of the small electrical steel sheet 2e is regulated by the large electrical steel sheet 2d sandwiched between the upper and lower sides, the hermetic container 1 and the outer peripheral part do not come into contact with each other, so A space 14 is formed.

Since the heat insulation space 14 is formed, heat is mainly transmitted from the large electromagnetic steel plate 2d of the stator 2 to the ambient air of the compressor 30 through the sealed container 1, and from the small electromagnetic steel plate 2e via the heat insulation space 14. Little heat is transferred. As a result, the amount of heat transferred to the ambient air of the hermetic compressor 30 is reduced as a whole. If the reduced amount of heat is used, the amount of heat for heating the refrigerant gas can be increased.

  According to the present embodiment, since the stator 2 and the sealed container 1 are brought into contact with each other at the contact portion formed uniformly in the circumferential direction, the fixing force acting between the stator 2 and the sealed container 1 is uniform. Is achieved. Further, since the axial direction is uniform, the fixing force can be uniform. As a result, the deformation of the stator 2 and the increase in vibration that occurs when the magnetic attraction force changes as the rotor 3 rotates can be suppressed.

  In addition, according to the present embodiment, since the non-uniformity of the temperature distribution in the stator 2 is improved, the change in the magnetic characteristics of the stator core 2a due to the non-uniform temperature distribution is suppressed, and the performance of the motor unit 20 is improved. Reduction can also be suppressed. Furthermore, according to the present embodiment, it is only necessary to change the shape of the outermost peripheral portion in the conventional stator core 2a, and the distance necessary for the flow of magnetic flux on the outer peripheral side required for the stator core 2a is secured. Further, since the shape of the inner periphery side of the stator core that greatly affects the magnetic characteristics does not need to be changed from the conventional one, the performance of the motor part is hardly deteriorated. Furthermore, since there is little shape change from the conventional stator core, it can manufacture at low cost.

  FIG. 6 shows a longitudinal sectional view of another embodiment of the hermetic compressor 30 according to the present invention, and FIG. 7 shows a detailed longitudinal sectional view of the stator 2 and the hermetic container 1 respectively. This embodiment differs from the embodiment shown in FIG. 1 in that when laminating two kinds of large and small electromagnetic steel sheets 2d and 2e, a plurality of sheets are laminated together to make a group, and the collected steel sheets are alternately arranged. This is because they are stacked. Specifically, a stack of four large electromagnetic steel plates 2d is adjacent to the stack of two small electromagnetic steel plates 2e in the vertical direction, and this is repeated. According to the present embodiment, compared with the embodiment shown in FIG. 1, the area where the stator 2 and the sealed container 1 are in contact with each other is increased, and the fixing force acting between the stator 2 and the sealed container 1 is more uniform. Can be distributed. As a result, the deformation of the stator core during shrink fitting is suppressed.

  FIG. 8 is a longitudinal sectional view of still another embodiment of the hermetic compressor 30 according to the present invention, and FIG. 9 is a detailed longitudinal sectional view of the stator 2 and the hermetic container 1. This embodiment is different from the above embodiments in that two large electromagnetic steel sheets 2d are stacked and four small electromagnetic steel sheets 2e are stacked next to each other in the vertical direction. There is something to repeat. According to the present embodiment, the contact area between the stator 2 and the sealed container 1 is reduced, and the heat insulating space 14 is increased. Therefore, the amount of heat transferred from the stator 2 to the sealed container 1 is reduced, and the refrigerant is further heated. it can. Therefore, the heating capacity during the heating operation is improved.

  FIG. 10 is a longitudinal sectional view of still another embodiment of the hermetic compressor 30 according to the present invention, FIG. 11 is a transverse sectional view thereof, and FIG. 12 is a plan view of the electromagnetic steel sheet 2g. This example is different from the above example in that instead of two types of large and small electromagnetic steel sheets, one type of electromagnetic steel sheet is used, and the outer shape is changed from a circular shape, and the circumferential position at the time of stacking is changed. The heat flow is the same as in the above embodiments. The thickness, material and manufacturing method of the electromagnetic steel sheet 2g are the same as in the above embodiment.

  The electromagnetic steel sheet 2g has notches 2f formed at three equal pitches on the outer periphery. The notch 2f extends in the circumferential direction around one slot and close to the end of the adjacent slot. The shape of the notch 2f is a concentric circle, and is a curve that smoothly connects to a portion that is not notched. When laminating the electromagnetic steel plates 2g, the magnetic steel plates 2g are laminated while being rotated by 60 ° around the rotating shaft 4. According to the present embodiment, the not-cut portion of the electromagnetic steel sheet 2g is widely distributed in the circumferential direction, so that the contact area between the stator 2 and the hermetic container 1 is reduced while avoiding concentration of the fixing portion of the stator 2. it can. Thereby, the stator 2 can be manufactured only by producing the electromagnetic steel plate 2g of a single shape, and cost reduction is attained.

  In the above embodiments, a rolling piston type hermetic compressor has been described as an example. However, the present invention is not limited to this type of compressor, and may be a scroll type or a reciprocating type hermetic compressor. Moreover, in the said Example, although the lamination | stacking number of sheets of the electromagnetic steel plate was made into 2 sheets or 4 sheets, this number is not restricted to it, 3 sheets or 5 sheets or more may be sufficient.

1 is a longitudinal sectional view of an embodiment of a hermetic compressor according to the present invention. It is a cross-sectional view of the hermetic compressor shown in FIG. It is a top view of the electromagnetic steel plate used for the hermetic compressor shown in FIG. It is a top view of the electromagnetic steel plate used for the hermetic compressor shown in FIG. FIG. 3 is a cross-sectional view taken along the line AA in FIG. 2. It is a longitudinal cross-sectional view of the other Example of the hermetic compressor which concerns on this invention. It is a figure explaining the flow of the heat in the hermetic compressor shown in FIG. It is a longitudinal cross-sectional view of the further another Example of the hermetic compressor which concerns on this invention. It is a figure explaining the flow of the heat in the hermetic compressor shown in FIG. It is a longitudinal cross-sectional view of the further another Example of the hermetic compressor which concerns on this invention. It is a cross-sectional view of the hermetic compressor shown in FIG. It is a top view of the electromagnetic steel plate used for the hermetic compressor shown in FIG. It is a Mollier diagram of the refrigeration cycle concerning the present invention.

Explanation of symbols

1 Sealed container 2 Stator 2a Iron core 2b Teeth 2c Winding (enameled wire)
2d, 2e, 2g Electrical steel plate 2f Notch 2j Slot 3 Rotor 4 Rotating shaft 5 Main bearing 6 Cylinder 7 Sub bearing 8 Roller 9 Coil spring 10 Vane 11 Suction pipe 12 Cover 13 Discharge pipe 14 Heat insulation space 15 Refrigerant flow path 16 Compression Space 17 Discharge port 18 Discharge valve 20 Electric motor section 25 Compression element 30 Hermetic compressor

Claims (7)

  In a hermetic compressor in which a compression element and an electric motor unit having a stator and a rotor are arranged in a hermetic container, the stator is formed by laminating a plurality of electromagnetic steel plates in the axial direction. The electromagnetic steel sheets that have a formed iron core and are stacked in a large number are arranged between a first electromagnetic steel sheet that has a contact portion that is arranged above and below and that contacts the inner wall of the sealed container, and the first electromagnetic steel sheets that are arranged above and below. And a second electrical steel sheet having a non-contact portion that is non-contact with the inner wall of the sealed container, and the first electrical steel sheet disposed above and below the first electrical steel sheet A hermetic compressor, wherein a heat insulating space is formed by the electromagnetic steel plate 2 and the hermetic container.   2. The hermetic compressor according to claim 1, wherein a maximum diameter of the first electromagnetic steel sheet is larger than a maximum diameter of the second electromagnetic steel sheet.   The said 1st electromagnetic steel plate and the 2nd electromagnetic steel plate are the same shapes, The said heat insulation space is formed by changing the circumferential direction position of this electromagnetic steel plate, and laminating | stacking, The heat insulation space is formed. Hermetic compressor.   The hermetic compressor according to any one of claims 1 to 3, wherein the first electromagnetic steel plate and the second electromagnetic steel plate are alternately laminated.   The heat insulation space is formed by laminating a plurality of the first electromagnetic steel plates and laminating a plurality of the second electromagnetic steel plates different from the number of the first electromagnetic steel plates. 4. The hermetic compressor according to any one of 3 above.   In a hermetic compressor in which a compression element and an electric motor unit that rotates and drives the compression element and has a stator and a rotor are arranged in a hermetic container, the stator includes two or more types of stators having different outer diameters. It has an iron core formed of a substantially ring-shaped electromagnetic steel sheet, and this iron core is made by alternately laminating electromagnetic steel sheets having a large maximum outer diameter and electromagnetic steel sheets having a small maximum outer diameter among many electromagnetic steel sheets. A hermetic compressor characterized by forming a heat insulating space. In a hermetic compressor in which a compression element and an electric motor section having a stator and a rotor are arranged to rotate and drive the compression element in a hermetic container, the stator has an iron core on which electromagnetic steel plates are laminated. The magnetic steel sheet of the iron core has a substantially annular shape with three notches formed at equal pitches on the outer periphery, and this magnetic steel sheet is laminated by changing the phase by 60 ° to form a heat insulating space. A hermetic compressor characterized by that.

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