JP2012154212A - Sealed motor compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sealed motor compressor which can reduce an oil percentage content of a coolant gas discharged from an airtight container.SOLUTION: In the sealed motor compressor which includes, in the air tight container, a compression mechanism, an electric motor driving the compression mechanism, and a plurality of insulators that are used for winding a coil of the electric motor and have gaps between each other on the most inside diameters thereof, and a plurality of pieces filling the gaps, the insulators have: insulator outer walls which are higher than a coil end when the coil is wound; and insulator inner walls which are higher than the coil end when the coil is wound and which are configured of the pieces.

Description

  The present invention relates to a hermetic electric compressor, and is particularly suitable for a hermetic electric compressor including an electric motor in which an insulator is installed on a stator.

  As shown in Patent Document 1, a conventional hermetic electric compressor includes a compression mechanism 2 that compresses a refrigerant gas and discharges the refrigerant gas into a hermetic container, an electric motor 7 that drives the compression mechanism 2, a compression mechanism 2, and an electric motor. 7 and a sealed container for storing lubricating oil at the bottom.

  The compression mechanism 2 is a swivel that forms a compression chamber by engaging a fixed scroll 3 with a spiral wrap standing on an end plate and a fixed scroll 3 with a spiral wrap standing on the end plate. The scroll 4 includes a frame 5 that supports the fixed scroll 3 and the orbiting scroll 4. The compression mechanism 2 compresses the refrigerant gas when the orbiting scroll 4 undergoes the orbiting movement in response to the rotation of the rotor 7a of the electric motor 7, but there is a sliding portion between the fixed scroll 3 and the orbiting scroll 4; Refrigerating machine oil is supplied to improve the lubrication of the sliding portion and the sealing performance of the compression space. Thereby, refrigeration oil is mixed with refrigerant gas and discharged in the compression process. The electric motor 7 includes an iron core 23, a coil 24 from which an end coil 17 projects from both sides of the iron core 23, and an insulator 25 arranged so as to insulate the iron core 23 from the coil (see FIG. 2). , A rotor 7a rotatably disposed in the central hole of the iron core 23, and fitted into the central hole of the rotor 7a so that at least one side protrudes from the rotor 7a and is eccentric by the compression mechanism 2. A shaft 6 to which force is applied and a balance weight 16 are provided on the upper side and the lower side of the rotor 7a.

  The mist-like refrigerant gas containing a large amount of refrigerating machine oil discharged upward from the discharge port of the fixed scroll 3 of the compression mechanism 2 passes through the outer periphery of the compression mechanism 2 and the gap between the outer periphery of the motor 7 and the coil. After passing through, it flows from the lower side to the upper side between the stator 7b and the rotor 7a, and flows out to the refrigeration cycle outside the sealed container through the discharge pipe 19. At this time, the mass percentage (wt%) of the oil contained in the refrigerant discharged to the refrigeration cycle outside the sealed container is called the oil content (oil rate) in the refrigerant gas.

  Examples of insulator shapes include those shown in FIG. 2 of Patent Document 2 in addition to FIG.

JP 2009-162168 A JP 2009-144581 A

  However, in the above-described conventional hermetic electric compressor, when the stator 7b is manufactured, the inner wall 25a of the insulator 25 has a gap necessary for winding the coil 24 around the iron core and the insulator 25. Since 24 needs to be wound at high speed and with high tension, the insulator inner wall 25a has an R shape as shown in FIG.

  In the refrigerant gas and oil outflow path described above, the refrigerant gas passes through the outer peripheral portion 18 a of the compression mechanism 2 and falls onto the iron core 23 and the coil 24 via the oil ring 88. Or in the compressor which does not have the oil ring 88, the refrigerant gas containing oil mist may contact the edge part of the coil 24 directly.

  The inside of the compressor generates a swirling flow along the rotation axis as the rotor 7a rotates, and at the same time, the radial direction generated by the balance weight 16a above the rotor 7a from the gap of the insulator inner wall 25a. As the flow velocity increases due to the flow of the refrigerant gas, the oil that has fallen onto the iron core 23 and the coil 24 or separated by the coil 24 is rolled up, and the mist-like refrigerant gas is stirred in the space 20 near the discharge pipe. This causes a problem that the refrigeration oil in the refrigerant gas discharged to the refrigeration cycle is increased and the oil rate is increased.

  An object of the present invention is to provide a hermetic electric compressor that can reduce the oil content of refrigerant gas discharged from a hermetic container.

The object of the present invention is as follows.
A compression mechanism;
An electric motor that drives the compression mechanism;
A plurality of insulators for winding the coil of the electric motor, the innermost diameter portion, the insulator having a gap between each other;
A plurality of pieces filling the gap;
In a hermetic electric compressor equipped with a sealed container,
The insulator is
An insulator outer wall higher than a coil end when the coil is wound;
An insulator inner wall that is higher than the coil end when the coil is wound and configured with the piece;
It is achieved by a hermetic electric compressor characterized by having

Also,
The compression mechanism 2 that compresses the refrigerant gas and discharges it into the sealed container, the electric motor 7 that drives the compression mechanism 2, and the sealed container that stores the compression mechanism 2 and the electric motor 7 and stores lubricating oil at the bottom. The electric motor 7 includes an iron core 23, a coil 24 from which an end coil 17 protrudes from both sides of the iron core 23, and an insulator 25 arranged so as to insulate the iron core 23 and the coil 24 from each other. The stator 7b, the rotor 7a rotatably disposed in the center hole of the iron core 23, and the center hole of the rotor 7a are fitted, and at least one side protrudes from the rotor 7a and is engaged with the compression mechanism 2. A shaft 6 to which an eccentric force is applied and a balance weight 16 installed on both sides of the rotor 7a are provided, and refrigerant gas containing oil discharged from the compression mechanism 2 is on one side between the stator 7b and the rotor 7a. From In hermetic electric compressor that flows to the side,
This is achieved by a hermetic electric compressor characterized in that the inner wall 25a and the outer wall 25b of the insulator 25 are made higher than the end coil 17 and there is no gap between the inner walls 25a.

Also,
The compression mechanism 2 that compresses the refrigerant gas and discharges it into the sealed container, the electric motor 7 that drives the compression mechanism 2, and the sealed container that stores the compression mechanism 2 and the electric motor 7 and stores lubricating oil at the bottom. The electric motor 7 includes an iron core 23, a coil 24 from which an end coil 17 protrudes from both sides of the iron core 23, and an insulator 25 arranged so as to insulate the iron core 23 and the coil 24 from each other. The stator 7b, the rotor 7a rotatably disposed in the center hole of the iron core 23, and the center hole of the rotor 7a are fitted, and at least one side protrudes from the rotor 7a and is engaged with the compression mechanism 2. A shaft 6 to which an eccentric force is applied and a balance weight 16 installed on both sides of the rotor 7a are provided, and refrigerant gas containing oil discharged from the compression mechanism 2 is on one side between the stator 7b and the rotor 7a. From In hermetic electric compressor that flows to the side,
This is achieved by a hermetic electric compressor characterized in that the total gap area of the inner wall 25a of the insulator 25 is 5% or less of the circumferential area.

Also,
The compression mechanism 2 that compresses the refrigerant gas and discharges it into the sealed container, the electric motor 7 that drives the compression mechanism 2, and the sealed container that stores the compression mechanism 2 and the electric motor 7 and stores lubricating oil at the bottom. The electric motor 7 includes an iron core 23, a coil 24 from which an end coil 17 protrudes from both sides of the iron core 23, and an insulator 25 arranged so as to insulate the iron core 23 and the coil 24 from each other. The stator 7b, the rotor 7a rotatably disposed in the center hole of the iron core 23, and the center hole of the rotor 7a are fitted, and at least one side protrudes from the rotor 7a and is engaged with the compression mechanism 2. A shaft 6 to which an eccentric force is applied and a balance weight 16 installed on both sides of the rotor 7a are provided, and refrigerant gas containing oil discharged from the compression mechanism 2 is on one side between the stator 7b and the rotor 7a. From In hermetic electric compressor that flows to the side,
By means of a sealed electric compressor characterized in that the inner wall 25a and the outer wall 25b of the insulator 25 are made higher than the end coil 17, and a substantially nozzle-like gap is provided in the inner wall 25a in the radial direction at the gap position between the coils. Achieved.

  According to the hermetic electric compressor of the present invention, the oil content of the refrigerant gas discharged from the hermetic container can be reduced.

It is a longitudinal cross-sectional view of the scroll compressor of 1st Example of this invention. It is a figure before piece attachment of the insulator in the electric motor of this embodiment. It is the perspective view seen from the state of piece attachment in the electric motor of this embodiment. It is the perspective view seen from the electric motor of the 2nd example.

  Hereinafter, examples will be described with reference to the drawings.

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

  The overall configuration, operation, function, and the like of the hermetic electric compressor 50 in this embodiment will be described with reference to FIG. In FIG. 1, the solid arrow indicates the flow of the lubricating oil 8 sucked up from the oil reservoir 9 at the bottom of the sealed container 1, and the dotted arrow indicates the flow of the refrigerant gas discharged from the compression mechanism 2.

  The hermetic electric compressor 50 is used as a refrigeration cycle component device such as a refrigeration air conditioner (for example, an air conditioner, a refrigerator, a freezer, a refrigeration / freezing showcase, etc.), a heat pump hot water supply device, etc. The mechanism 2 and the electric motor 7 are provided as main components.

  The sealed container 1 includes a cylindrical tube portion and a lid portion welded to the top and bottom of the tube portion, and the inside is a sealed space. The hermetic container 1 houses the compression mechanism 2 and the electric motor 7 and stores a lubricating oil 8 such as a refrigerating machine oil in an oil reservoir 9 at the bottom. The oil surface of the lubricating oil 8 is set to be positioned above the auxiliary bearing 15.

  A suction pipe 11 is provided through the upper lid portion of the sealed container 1, and a discharge pipe 19 is provided through the cylinder portion of the sealed container 1. The discharge pipe 19 is located directly below the frame 5 and is provided so as to protrude in the center direction in the sealed container 1. The distal end of the discharge pipe 19 is opened to protrude from the outer peripheral surface of the end coil 17 toward the center side.

  The compression mechanism 2 compresses a refrigerant gas such as fluorocarbon and carbon dioxide and discharges the refrigerant gas into the sealed container 1, and is installed in the upper part of the sealed container 1. The compression mechanism 2 includes a fixed scroll 3, a turning scroll 4, a frame 5, and an Oldham ring 10 as main components.

  The fixed scroll 3 is configured by standing a spiral wrap on the end plate, and is bolted on the frame 5. A suction port 12 is provided in the peripheral portion of the fixed scroll 3, and a discharge port 14 is provided in the central portion. A suction pipe 11 communicates with the suction port 12. The discharge port 14 communicates with the space above the compression mechanism 2 in the sealed container 1.

  The orbiting scroll 4 is configured by standing a spiral wrap on the end plate, and meshes with the fixed scroll 3 to form a compression chamber. The orbiting scroll 4 is sandwiched between the fixed scroll 3 and the frame 5. A boss portion protrudes from the anti-fixed scroll side of the orbiting scroll 4, and an orbiting bearing is installed in the boss portion, and an eccentric pin portion 6 a of the shaft 6 is fitted in the orbiting bearing.

  The Oldham ring 10 constitutes a rotation restricting mechanism of the orbiting scroll 4 and is installed between the orbiting scroll 4 and the frame 5 to prevent the orbiting scroll 4 from rotating and to perform a circular orbit motion.

  The frame 5 is fixed to the sealed container 1 by welding, and supports the fixed scroll 3, the Oldham ring 10, and the orbiting scroll 4. A cylindrical portion protruding downward is provided at the center of the frame 5. A main bearing 5a that supports the shaft 6 is provided in the cylindrical portion. A plurality of discharge gas passages 18 a communicating the upper space of the fixed scroll 3 and the lower space of the frame 5 are formed in the outer peripheral portions of the fixed scroll 3 and the frame 5. The plurality of discharge gas passages 18a are arranged over the entire circumference.

  The electric motor 7 is composed of a synchronous motor including a stator 7b, a rotor 7a, a shaft 6, and a balance weight 16 as main components.

  The stator 7 b is configured to insulate the coil 24 having a plurality of conductors that generate a rotating magnetic field by passing an electric current, the iron core 23 for efficiently transmitting the rotating magnetic field, and the iron core 23 and the coil 24. Is provided as a main component. The end coil 17 of the coil 24 protrudes from both sides of the iron core 23. The iron core 23 is fixed by being shrink-fitted in the sealed container 1. A large number of notches are formed on the outer periphery of the stator 7b, and a discharge gas passage 18a is formed between the notches and the sealed container 1.

  The rotor 7a includes an iron core 23 and a permanent magnet built in the iron core 23 as main components, converts a rotating magnetic field from the stator 7b into a rotational motion, and is rotated around the shaft 6. The rotor 7a is rotatably disposed in the central hole of the iron core 23 of the stator 7b.

  The shaft 6 is fitted into the central hole of the rotor 7a and integrated with the rotor 7a. One side (upper side in the illustrated example) of the shaft 6 protrudes from the rotor 7 a and is engaged with the compression mechanism 2, and an eccentric force is applied by the compression operation of the compression mechanism 2. In the present embodiment, the shaft 6 protrudes from both sides of the rotor 7a, and is supported by the main bearing 5a and the auxiliary bearing 15 on both sides of the rotor 7a, and can rotate stably. The auxiliary bearing 15 is supported by a supporting member fixed by welding to the sealed container 1 and is immersed in the lubricating oil 8.

  The lower end of the shaft 6 extends into the oil reservoir 9 at the bottom of the sealed container 1. The shaft 6 is provided with through holes 6b for supplying the lubricating oil 8 to the bearings and the sliding surfaces, and the lubricating oil 8 is sucked up from the oil reservoir 9 through the through holes 6b. The lubricating oil 8 sucked up through the through hole 6 b is supplied to the sliding portions of the bearings and the compression mechanism 2. Since the lubricating oil 8 supplied to the sliding portion of the compression mechanism 2 is discharged from the discharge port 14 at the center of the fixed scroll 3 together with the refrigerant gas, the discharge gas discharged from the discharge port 14 has a mist shape. Contains a lot of lubricating oil.

  FIG. 2 shows an insulator. The insulator 25 is positioned at the upper end and the lower end of the stator 7b, and the coil 24 is wound around the iron core. The insulator 25 has an inner wall 25a and an outer wall 25b, and the height thereof is higher than the height of the end coil 17.

  Further, the insulator shown in FIG. 3 is obtained by filling the gap of the insulator shown in FIG. The insulator inner wall 25a has an R shape as shown in FIG. 2 for winding the coil 24, and has a gap between the insulators. In order to fill the gap, a piece is inserted to eliminate the gap.

  In such a configuration, when the electric motor 7 is energized and the rotor 7a is rotated, the shaft 6 is also rotated accordingly, and the eccentric pin portion 6a performs an eccentric rotational movement, whereby the orbiting scroll 4 is driven to rotate. The compression chamber formed between the fixed scroll 3 and the orbiting scroll 4 becomes smaller while moving from the outer peripheral side to the central portion. As a result, the refrigerant gas is sucked and compressed through the suction pipe 11 and the suction port 12 leading to the refrigeration cycle outside the sealed container 1, and the compressed refrigerant gas is discharged from the discharge port 14 at the center of the fixed scroll 3. It is discharged into the upper space in the sealed container 1. These operations are repeated.

  A mist-like refrigerant gas containing a large amount of lubricating oil discharged upward from the discharge port 14 of the fixed scroll 3 passes through a discharge gas passage 18 a provided in the outer peripheral portion of the compression mechanism 2 and is located inside the sealed container 1. It is guided from the entire circumference to a space 20 below the compression mechanism 2 (a space above the electric motor 7). In this process, a part of the oil contained in the refrigerant gas is separated, adheres to the oil ring 88 and forms a ball shape, and falls onto the end coil 17 and the iron core 23. At this time, most of the oil component falls on the end coil 17. In the space 20 above the upper end coil 17a, a large-scale air flow is generated in the circumferential direction and the rotation direction by the rotor 7a that rotates at high speed, and the oil that falls on the end coil 17 and adheres to the coil is removed from the insulator. Since the inner wall 25a is high and there is no gap, the structure is not easily affected by the air flow, so the flow velocity in the space between the insulator inner wall 25a and the outer wall 25b decreases. The oil adhering to the coil is prevented from being re-misted, and the oil component passes through the coil surface, passes through the iron core 23, and is stored in the oil reservoir 9 at the bottom of the sealed container 1.

  Similarly, the oil that has fallen to the outer peripheral side of the upper end surface of the iron core 23 has a structure in which the insulator outer wall 25b is higher than the coil height, so that the influence of the air flow in the circumferential direction and the rotational direction by the rotor 7a is minimized. Since the flow rate decreases, re-misting can be suppressed. Therefore, the oil is not re-misted but efficiently travels through the discharge gas passage 18b and is stored in the oil reservoir 9 at the bottom of the sealed container 1.

  The phenomenon of a decrease in the flow velocity in the insulator inner space (upper side) is the same on the lower side of the insulator. It is desirable that the oil component guided to the space 21 below the electric motor 7 via the coil surface and the discharge gas passage 18b is dripped as a ball as much as possible when dripping into the oil reservoir.

  Even in the space 21 below the motor 7, a large air flow is generated in the circumferential direction and the rotational direction by the balance weight 16b, and if the insulator wall is high and there is no gap, the flow velocity inside the insulator decreases, Mist can be suppressed. Therefore, the oil becomes a large ball and falls into the oil sump.

  Next, a second embodiment of the present invention will be described with reference to FIG. FIG. 4 is an enlarged view of an insulator portion of the hermetic electric compressor according to the second embodiment of the present invention. The second embodiment is different from the first embodiment as described below, and is basically the same as the first embodiment in other points.

  In this 2nd Example, the wall surface 26a extended from the insulator inner wall 25a to the outer wall 25b is provided with respect to the piece 26 installed in the insulator, and the insulator inner / outer wall space is divided. By dividing the insulator inner / outer wall space into coils, re-misting of the oil separated by each coil is suppressed, and at the same time, the flow velocity of the separated space is further reduced, and oil on the upper surface of the coil is re-misted. The oil rate can be reduced.

  Next, a third embodiment of the present invention will be described.

  Although not shown in the drawing, it is necessary to adjust the position corresponding to the wall surface 26a according to the clearance between the rotor 7a and the wall surface 26a and the moving speed of the surface of the rotor 7a. By providing the above, by guiding the flow of the refrigerant gas generated by the rotor 7a in the radial direction of the compressor, a similar effect can be expected by providing as a so-called air curtain at the partition wall position shown in the second embodiment.

  According to each of the embodiments described above, in the scroll compressor, the compression mechanism 2 that compresses the refrigerant gas and discharges it into the sealed container, the electric motor 7 that drives the compression mechanism 2, the compression mechanism 2, and the electric motor 7 are provided. The electric motor 7 includes an iron core 23, a coil 24 in which an end coil 17 projects from both sides of the iron core 23, and an iron core 23. A stator 7b having an insulator 25 disposed so as to be insulated from the coil 24, a rotor 7a rotatably disposed in a central hole of the iron core 23, and at least a center hole of the rotor 7a fitted into the central hole. One side protrudes from the rotor 7a and is engaged with the compression mechanism 2 to be applied with an eccentric force. The balance weight 16 is provided on both sides of the rotor 7a, and is discharged from the compression mechanism 2. In a hermetic electric compressor in which refrigerant gas containing oil component flows between the stator 7b and the rotor 7a from one side to the other side, from the gap between the coils on the inner wall surface of the insulator 25 on the rotor 7a side. By suppressing or controlling the inflow of the refrigerant, the disturbance of the refrigerant flow on the iron core 23 and the coil 24 is suppressed, and the oil mist is suppressed.

DESCRIPTION OF SYMBOLS 1 Airtight container 2 Compression mechanism 3 Fixed scroll 4 Orbiting scroll 5 Frame 5a Main bearing 6 Shaft 6a Eccentric pin part 6b Oil supply hole 7 Electric motor 7a Rotor 7b Stator 8 Lubricating oil 9 Oil reservoir 10 Oldham ring 11 Suction pipe 12 Suction port 14 Discharge pipe 15 Sub bearing 16 Balance weight 16a Upper balance weight 16b Lower balance weight 17 Coil end 17a Upper coil end 17b Lower coil end 18a 18b Discharge gas passage 19 Discharge pipe 20 Upper space 21 of the motor 21 Lower space 23 of the motor 23 Stator Iron core 24 Stator coil 25 Insulator 25a Insulator inner wall 25b Insulator outer wall 26 Piece 50 Sealed electric compressor 88 Oil ring

Claims (5)

A compression mechanism;
An electric motor that drives the compression mechanism;
A plurality of insulators for winding the coil of the electric motor, the innermost diameter portion, the insulator having a gap between each other;
A plurality of pieces filling the gap;
In a hermetic electric compressor equipped with a sealed container,
The insulator is
An insulator outer wall higher than a coil end when the coil is wound;
An insulator inner wall that is higher than the coil end when the coil is wound and configured with the piece;
A hermetic electric compressor characterized by comprising: The compression mechanism 2 that compresses the refrigerant gas and discharges it into the sealed container, the electric motor 7 that drives the compression mechanism 2, and the sealed container that stores the compression mechanism 2 and the electric motor 7 and stores lubricating oil at the bottom. The electric motor 7 includes an iron core 23, a coil 24 from which an end coil 17 protrudes from both sides of the iron core 23, and an insulator 25 arranged so as to insulate the iron core 23 and the coil 24 from each other. The stator 7b, the rotor 7a rotatably disposed in the center hole of the iron core 23, and the center hole of the rotor 7a are fitted, and at least one side protrudes from the rotor 7a and is engaged with the compression mechanism 2. A shaft 6 to which an eccentric force is applied and a balance weight 16 installed on both sides of the rotor 7a are provided, and refrigerant gas containing oil discharged from the compression mechanism 2 is on one side between the stator 7b and the rotor 7a. From In hermetic electric compressor that flows to the side,
2. A hermetic electric compressor characterized in that an inner wall 25a and an outer wall 25b of an insulator 25 are made higher than an end coil 17 and there is no gap between the inner walls 25a. The hermetic electric compressor according to claim 2,
A hermetic electric compressor characterized in that a wall extending from an insulator inner wall 25a to an outer wall 25b is vertically or inclined with respect to a piece 26 installed in the insulator 25 to divide the insulator inner / outer wall space. The compression mechanism 2 that compresses the refrigerant gas and discharges it into the sealed container, the electric motor 7 that drives the compression mechanism 2, and the sealed container that stores the compression mechanism 2 and the electric motor 7 and stores lubricating oil at the bottom. The electric motor 7 includes an iron core 23, a coil 24 from which an end coil 17 protrudes from both sides of the iron core 23, and an insulator 25 arranged so as to insulate the iron core 23 and the coil 24 from each other. The stator 7b, the rotor 7a rotatably disposed in the center hole of the iron core 23, and the center hole of the rotor 7a are fitted, and at least one side protrudes from the rotor 7a and is engaged with the compression mechanism 2. A shaft 6 to which an eccentric force is applied and a balance weight 16 installed on both sides of the rotor 7a are provided, and refrigerant gas containing oil discharged from the compression mechanism 2 is on one side between the stator 7b and the rotor 7a. From In hermetic electric compressor that flows to the side,
A hermetic electric compressor characterized in that the total clearance area of the inner wall 25a of the insulator 25 is 5% or less of the circumferential area. The compression mechanism 2 that compresses the refrigerant gas and discharges it into the sealed container, the electric motor 7 that drives the compression mechanism 2, and the sealed container that stores the compression mechanism 2 and the electric motor 7 and stores lubricating oil at the bottom. The electric motor 7 includes an iron core 23, a coil 24 from which an end coil 17 protrudes from both sides of the iron core 23, and an insulator 25 arranged so as to insulate the iron core 23 and the coil 24 from each other. The stator 7b, the rotor 7a rotatably disposed in the center hole of the iron core 23, and the center hole of the rotor 7a are fitted, and at least one side protrudes from the rotor 7a and is engaged with the compression mechanism 2. A shaft 6 to which an eccentric force is applied and a balance weight 16 installed on both sides of the rotor 7a are provided, and refrigerant gas containing oil discharged from the compression mechanism 2 is on one side between the stator 7b and the rotor 7a. From In hermetic electric compressor that flows to the side,
An hermetic electric compressor characterized in that an inner wall 25a and an outer wall 25b of an insulator 25 are made higher than an end coil 17, and a substantially nozzle-like gap is provided radially in the inner wall 25a at a gap position between the coils.