JP5575000B2 - Hermetic compressor - Google Patents

Description

  The present invention relates to a hermetic compressor. Specifically, the present invention relates to a separation mechanism for refrigerating machine oil contained in refrigerant discharge gas inside a hermetic compressor.

  A conventional oil separation mechanism of a hermetic compressor is constituted by, for example, a disk-shaped oil separator provided on the upper portion of a rotor (see, for example, Patent Document 1).

  A conventional hermetic rotary compressor has a configuration in which a compression mechanism that sucks and compresses refrigerant gas and an electric motor that drives the compression mechanism are housed in a hermetic container. An oil sump for storing refrigeration oil is formed in the lower part of the sealed container.

  In the hermetic rotary compressor, the sucked refrigerant gas is compressed by the compression mechanism, and the compressed refrigerant gas is discharged into the sealed container through the discharge muffler. Then, it passes through the gap between the hermetic container and the stator of the motor, the gap between the rotor and the stator of the motor (referred to as the air gap), and the air hole through which the refrigerant gas opened in the rotor passes, and the refrigeration air conditioning from the discharge pipe It is discharged into the refrigeration cycle of the device.

  On the other hand, the refrigerating machine oil stored in the oil reservoir at the lower part of the hermetic container rises in the flow path formed inside the drive shaft when the drive shaft rotates, and air-tight oil and lubrication are applied to each sliding portion of the compression mechanism portion. Supplied as oil.

  The refrigerating machine oil that has lubricated the compression mechanism is discharged into the sealed container through the discharge hole of the discharge muffler together with the compressed refrigerant gas, and then falls to the lower part of the sealed container and recirculates.

Japanese Utility Model Publication No. 7-10486 (2nd page, Fig. 4)

  In a hermetic rotary compressor, an oil sump is formed in the lower part of the hermetic container, and usually an oil level is formed from the upper surface of the cylinder to the discharge port position of the discharge muffler in order to ensure the confidentiality of the compression mechanism. The The compressor upper space where the refrigerating machine oil has the discharge pipe together with the high-pressure refrigerant discharged from the discharge muffler due to the oil surface undulations due to the reciprocating movement of the vane, the oil jumping and the centrifugal force / stirring force accompanying the rotation of the rotor So that it easily flows out into the external refrigeration apparatus.

  If the refrigeration oil flows excessively into the refrigeration apparatus, the heat exchange rate of the refrigeration apparatus decreases, and the performance of the refrigeration apparatus deteriorates.

  In addition, if the refrigerating machine oil enclosed in the sealed container is excessively reduced, the airtightness in the compression mechanism part is lowered and the compression performance is deteriorated, or sufficient oil supply in each sliding part cannot be ensured. There is also a problem that the performance of the hermetic rotary compressor cannot be maintained, such as causing a failure.

  In the conventional hermetic compressor, a disk-shaped oil separator is attached to the upper part of the rotor of the electric motor in order to control that the refrigerating machine oil enclosed in the hermetic container flows excessively into the refrigerating apparatus.

  The cup-shaped (or disk-shaped) oil separator provided at the upper part of the rotor rotates with the rotation of the drive shaft, and blows out the refrigeration oil contained in the refrigerant gas in the compressor upper space to the outside by a centrifugal separation action. Refrigeration oil is prevented from flowing into the discharge pipe together with the refrigerant gas.

  However, when the amount of refrigeration oil contained in the refrigerant gas in the compressor head space discharged from the compression mechanism at high speed or high load is large, the effect of sufficiently separating the refrigerant gas and refrigeration oil by the centrifugal separation action May not be obtained.

  The present invention has been made to solve the above-described problems, and suppresses the ripple of the oil surface due to the reciprocating motion of the vanes, and further blocks the centrifugal force / stirring force accompanying the rotation of the rotor. Provided is a hermetic compressor in which refrigeration oil cannot be lifted into the compressor upper space, and only refrigerant gas is discharged from the hermetic container.

A hermetic compressor according to the present invention includes a compression mechanism unit that sucks and compresses refrigerant gas into a cylinder having a vane groove in which a vane reciprocates, and discharges the refrigerant gas into a sealed container from a discharge hole of a discharge muffler. A hermetic compressor in which a motor driven by a rotor is housed in a hermetic container,
At least one oil level holding plate is provided at a predetermined position between the upper end surface of the cylinder and the lower end surface of the rotor at a predetermined distance from the cylinder and the rotor, and at least one of the oil level holding plates is discharged. Provided below the discharge hole of the muffler, and the outer diameter of the oil level retaining plate is equal to or larger than the diameter covering the vane groove and smaller than the inner diameter of the sealed container.

  The hermetic compressor according to the present invention is provided with an oil level holding plate to suppress the ripple of the oil level due to the reciprocating motion of the vane, and further to block the centrifugal force and the stirring force accompanying the rotation of the rotor. It can no longer be lifted into the upper space of the sealed container, and only the refrigerant gas can be discharged from the sealed container.

FIG. 3 is a longitudinal sectional view showing the configuration of the hermetic rotary compressor 100 according to the first embodiment. FIG. 5 shows the first embodiment, and is a plan view of a first oil level retaining plate 12. FIG. 5 shows the first embodiment, and shows the positional relationship between the outer diameter of the first oil level retaining plate 12 and the vane groove 6a. FIG. 5 shows the first embodiment, and is a partial longitudinal sectional view showing a configuration of a hermetic rotary compressor 200 according to a first modification. FIG. 5 is a diagram illustrating the first embodiment, and is a longitudinal sectional view illustrating a configuration of a compression mechanism section 301 of a hermetic rotary compressor 300 according to a second modification. FIG. 5 shows the first embodiment, and is a perspective view of a first oil level retaining plate 412 of the hermetic rotary compressor 400 of Modification 3.

Embodiment 1 FIG.
FIG. 1 is a diagram showing the first embodiment, and is a longitudinal sectional view showing a configuration of a hermetic rotary compressor. A hermetic rotary compressor 100 (hermetic compressor) shown in FIG. 1 has a configuration in which a compression mechanism unit 101 that compresses a refrigerant and an electric motor 102 that drives the compression mechanism unit 101 are incorporated in the hermetic container 9. is there. Furthermore, the refrigerating machine oil 15 is stored at the bottom of the sealed container 9.

  The compression mechanism 101 includes a cylinder 1, an upper bearing 2, a lower bearing 3, a crankshaft 4, a rolling piston 5, a discharge muffler 10, a first oil level retaining plate 12, a vane 6 (see FIG. 3), and the like. .

  The present embodiment is characterized in that the compression mechanism unit 101 includes the first oil level retaining plate 12. Before describing the first oil level retaining plate 12, the configuration of the compression mechanism unit 101 will be described.

  A cylinder 1 in which a compression chamber is formed has a cylinder chamber whose outer periphery is substantially circular in a plan view and is a space that is substantially circular in a plan view. The cylinder chamber is open at both axial ends. The cylinder 1 has a predetermined axial height in a side view.

  A parallel vane groove 6a (see FIG. 3) that communicates with a cylinder chamber that is a substantially circular space of the cylinder 1 and extends in the radial direction is provided so as to penetrate in the axial direction.

  Further, a back pressure chamber (not shown) which is a substantially circular space in plan view communicating with the vane groove 6a is provided on the back surface (outside) of the vane groove 6a.

  An intake port (not shown) through which intake gas from the refrigeration cycle passes through the cylinder 1 passes through the cylinder chamber from the outer peripheral surface of the cylinder 1.

  The cylinder 1 is provided with a discharge port (not shown) in which the vicinity of the edge of the circle forming the cylinder chamber which is a substantially circular space (the end face on the side of the electric motor 102) is cut out.

  The rolling piston 5 rotates eccentrically in the cylinder chamber. The rolling piston 5 has a ring shape, and the inner periphery of the rolling piston 5 is slidably fitted to the eccentric shaft portion 4 d of the crankshaft 4.

  The vane 6 is accommodated in the vane groove 6a of the cylinder 1, and the vane 6 is always pressed against the rolling piston 5 by a vane spring (not shown) provided in the back pressure chamber. Since the hermetic rotary compressor 100 has a high pressure inside the hermetic container 9, when the operation is started, the force due to the differential pressure between the high pressure in the hermetic container 9 and the pressure in the cylinder chamber on the back surface (back pressure chamber side) of the vane 6. Therefore, the vane spring is mainly used for the purpose of pressing the vane 6 against the rolling piston 5 when the hermetic rotary compressor 100 is started (when there is no difference in pressure between the sealed container 9 and the cylinder chamber). .

  The shape of the vane 6 is a flat shape (the thickness in the circumferential direction is smaller than the length in the radial direction and the axial direction).

  The upper bearing 2 is slidably fitted to the main shaft portion 4b (a portion above the eccentric shaft portion 4d) of the crankshaft 4, and one end surface (electric motor) of the cylinder chamber of the cylinder 1 (including the vane groove 6a). 102 side) is closed.

  A discharge valve (not shown) is attached to the upper bearing 2. The upper bearing 2 has a substantially inverted T shape when viewed from the side.

  The lower bearing 3 is slidably fitted to the auxiliary shaft portion 4c (the portion below the eccentric shaft portion 4d) of the crankshaft 4, and the other end surface of the cylinder chamber (including the vane groove 6a) of the cylinder 1 ( Close the refrigerator oil side. The lower bearing 3 is substantially T-shaped when viewed from the side.

  A discharge muffler 10 is attached to the upper bearing 2 on the outer side (motor 102 side). The high-temperature and high-pressure discharge gas discharged from the discharge valve of the upper bearing 2 enters the discharge muffler 10 at one end, and is then discharged from the discharge hole 10 a of the discharge muffler 10 into the sealed container 9.

  A suction muffler 20 that sucks low-pressure refrigerant gas from the refrigeration cycle and suppresses the liquid refrigerant from being directly sucked into the cylinder chamber of the cylinder 1 when the liquid refrigerant returns to the side (side) of the sealed container 9. Provided. The suction muffler 20 is connected to the suction port of the cylinder 1 via a suction pipe 21. The suction muffler 20 is fixed to the side surface of the sealed container 9 by welding or the like.

  The high-temperature and high-pressure gas refrigerant compressed by the compression mechanism 101 passes through the electric motor 102 from the discharge hole 10a of the discharge muffler 10 and is discharged from the discharge pipe 11 to an external refrigerant circuit (not shown).

  The electric motor 102 includes a stator 7 and a rotor 8. The electric motor 102 is, for example, a brushless DC motor that uses a permanent magnet for the rotor 8. However, an induction motor may be used.

  Power (three-phase power, single-phase power in the case of a single-phase induction motor) is supplied from an external power source to the stator 7 of the motor 102 via the glass terminal 30 and the lead wire 31.

  Next, the first oil level retaining plate 12 which is a characteristic part of the present embodiment will be described. 2 and 3 are diagrams showing the first embodiment. FIG. 2 is a plan view of the first oil level holding plate 12. FIG. 3 is an outer diameter of the first oil level holding plate 12 and the position of the vane groove 6a. It is a figure which shows a relationship.

  As shown in FIG. 1, one or more first oil level holding plates 12 (oil level holding plates) are provided at a predetermined interval from the upper end surface of the cylinder 1. In the example of FIG. 1, one first oil level holding plate 12 is provided. The first oil level retaining plate 12 is provided below the discharge hole 10 a of the discharge muffler 10.

  As shown in FIG. 2, the first oil level retaining plate 12 has a substantially donut shape in plan view. The substantially donut-shaped portion between the oil level holding plate outer diameter 12a and the oil level holding plate inner diameter 12b becomes the oil level holding part.

  Further, the first oil level holding plate 12 is formed with fixing portions 12c protruding inward from the oil level holding plate inner diameter 12b at substantially equal intervals in the circumferential direction, and bolts into which bolts are inserted into the respective fixing portions 12c. An insertion hole 12d is formed.

  The first oil level retaining plate 12 is, for example, a fixing bolt 40 that fixes the upper bearing 2 to the cylinder 1 by using a bolt insertion hole 12d. 102 side). However, the same effect can be obtained even if the inner diameter of the sealed container 9 is fixed. Further, it may be fixed to the upper surface of the cylinder 1.

  As shown in FIG. 3, the at least one first oil level retaining plate 12 has an oil level retaining plate outer diameter 12a larger than the diameter covering the vane groove 6a, and the inner diameter of the sealed container 9 (the outer diameter of the cylinder 1). Therefore, it is characterized by having a predetermined dimension and a slightly smaller diameter.

  Further, the oil level holding plate inner diameter 12 b of the one first oil level holding plate 12 is substantially equal to the outer diameter of the discharge muffler 10. Accordingly, the first oil level retaining plate 12 substantially covers the oil level of the refrigerating machine oil 15.

  The first oil level holding plate 12 suppresses the ripples of the oil level of the refrigerating machine oil 15 due to the reciprocating motion of the vanes 6, and further blocks the centrifugal force and stirring force associated with the rotation of the rotor 8. Thereby, the refrigerating machine oil 15 cannot be lifted to the upper space of the sealed container 9, and only the refrigerant gas is discharged from the sealed container 9. Therefore, the amount of the refrigerating machine oil 15 released to the refrigerating apparatus can be reduced, and the performance deterioration of the refrigerating apparatus and the performance deterioration of the hermetic rotary compressor 100 due to the oil rising can be suppressed.

  Thus, according to the hermetic rotary compressor 100 shown in FIG. 1, the refrigeration oil 15 can no longer be lifted into the upper space of the hermetic container 9, and the upper part of the rotor 8 is placed like the conventional hermetic rotary compressor. There is no need to provide an oil separation mechanism.

  However, if an oil separation mechanism is provided in the upper part of the rotor 8, the amount of refrigerating machine oil discharged to the refrigerating apparatus can be further reduced. Further, the performance of the refrigerating apparatus is reduced due to the oil rising, and the hermetic rotary compressor 100 is further reduced. The performance degradation of itself can be suppressed.

  As shown in FIG. 2, the shape of the first oil level retaining plate 12 is substantially donut shape, but the purpose of providing the first oil level retaining plate 12 is the oil of the refrigerating machine oil 15 by the reciprocating motion of the vane 6. Since it is to suppress the undulation of the surface, even if it is not substantially doughnut-shaped, a shape that covers only the upper part of the vane groove 6a is effective.

  However, since the oil level of the refrigeration oil 15 is affected by the centrifugal force and stirring force accompanying the rotation of the rotor 8, the effect is less than that of the first oil level holding plate 12 having a substantially donut shape.

  In addition, the maximum diameter of the first oil level retaining plate 12 can be up to the inner diameter of the sealed container 9, but in that case, the refrigerating machine oil 15 separated at the upper portion of the first oil level retaining plate 12 is returned to the oil reservoir. For this purpose, it is necessary to add a drilling process or notch shape.

  FIG. 4 is a diagram showing the first embodiment, and is a partial longitudinal sectional view showing a configuration of a hermetic rotary compressor 200 according to the first modification. As shown in FIG. 4, the hermetic rotary compressor 200 of Modification 1 includes a first oil level holding plate 12 in addition to the first oil level holding plate 12 of the hermetic rotary compressor 100 of FIG. 1. In addition, one or more second oil level holding plates 13 (oil level holding plates) are provided at a predetermined interval from the lower end of the rotor 8. FIG. 4 shows an example of one second oil level retaining plate 13. Other configurations are the same as those of the hermetic rotary compressor 100.

  Another second oil level retaining plate 13 has a substantially donut shape, and its outer diameter is a predetermined dimension slightly larger than the outer diameter of the rotor 8.

  For example, the second oil level retaining plate 13 is fixed to the end of the bearing portion of the upper bearing 2 on the rotor 8 side by press-fitting or the like.

  The hermetic rotary compressor 200 of Modification 1 is provided with one or more second oil level holding plates 13 at a predetermined interval from the lower end of the rotor 8 separately from the first oil level holding plate 12. The effect of blocking the influence of centrifugal force and stirring force accompanying the rotation of the rotor 8 is increased as well as suppressing the ripple of the oil surface of the refrigerating machine oil 15 due to the reciprocating motion of the vane 6.

  Thereby, only the refrigerating machine oil 15 becomes easy to dripping from the discharge gas containing the refrigerating machine oil 15 discharged from the discharge muffler 10. Since the refrigerating machine oil 15 falls into the oil reservoir, the refrigerating machine oil 15 cannot be lifted to the upper space of the sealed container 9 and only the refrigerant gas is discharged from the sealed container 9. Accordingly, the amount of the refrigerating machine oil 15 released to the refrigeration cycle of the refrigeration air conditioner or the like can be reduced, and the performance deterioration of the refrigeration air conditioner or the like due to the oil rising and the performance deterioration of the hermetic rotary compressor 200 itself can be suppressed. I can do it.

  FIG. 5 shows the first embodiment, and is a longitudinal sectional view showing the configuration of the compression mechanism 301 of the hermetic rotary compressor 300 of the second modification. In the hermetic rotary compressor 300 according to the second modification, an oil level holding plate is integrally formed with the discharge muffler 110. Other configurations are the same as those of the hermetic rotary compressor 100.

  The flange portion of the discharge muffler 110 is enlarged in the radial direction at a predetermined interval from the upper end surface of the cylinder 1. The outer diameter of the discharge muffler 110 is larger than the diameter covering the vane groove 6a, similar to the outer diameter 12a of the oil level holding plate 12 of the first oil level holding plate 12 shown in FIG. 1 outer diameter), and a predetermined dimension is slightly smaller.

  The discharge muffler 110 integrally formed with the oil level holding plate of the hermetic rotary compressor 300 of Modification 2 suppresses the oil level of the refrigerating machine oil 15 due to the reciprocating motion of the vane 6. Further, by interrupting the centrifugal force / stirring force accompanying the rotation of the rotor 8, the refrigerating machine oil 15 cannot be lifted to the upper space of the sealed container 9, and only the refrigerant gas is discharged from the sealed container 9. Therefore, the amount of the refrigerating machine oil 15 released to the refrigeration cycle such as an external refrigeration air conditioner can be reduced, and the performance deterioration of the refrigeration air conditioner and the like due to the oil rising and the performance deterioration of the hermetic rotary compressor 300 itself are suppressed. I can do it.

  According to the hermetic rotary compressor 300 of the second modification, the discharge muffler 110 can be provided with the function of the oil level retaining plate, so that the number of parts can be reduced and the manufacturing cost can be reduced.

  It should be noted that the same effect can be obtained by enlarging the flange portion (cylinder closing portion) of the upper bearing 2 in the radial direction.

  FIG. 6 is a diagram showing the first embodiment, and is a perspective view of the first oil level retaining plate 412 of the hermetic rotary compressor 400 of the third modification. The hermetic rotary compressor 400 of Modification 3 includes a first oil level holding plate 412 corresponding to the first oil level holding plate 12, and a second oil level holding plate 13 corresponding to the second oil level holding plate 13 although not shown. The oil level holding plate 413 is dimple processed.

  The first oil level retaining plate 412 or the second oil level retaining plate 413 is subjected to processing to increase the surface area such as dimple processing, so that the refrigerating machine oil 15 is entangled from the discharge gas containing the refrigerating machine oil 15, The refrigerating machine oil 15 cannot be lifted to the upper space of the sealed container 9, and only the refrigerant gas is discharged from the sealed container 9.

  It is preferable to perform dimple processing on both the front and back surfaces of the first oil level holding plate 412 or the second oil level holding plate 413.

  However, dimple processing may be performed on one side of the first oil level holding plate 412 or the second oil level holding plate 413 instead of the front and back sides. In that case, the first oil level holding plate 412 is preferably subjected to dimple processing on one side of the motor on which the discharge gas containing the refrigerating machine oil 15 exists. On the other hand, the second oil level retaining plate 413 is preferably subjected to dimple processing on one side opposite to the electric motor.

  By applying a process for increasing the surface area such as dimple processing to the first oil level holding plate 412 or the second oil level holding plate 413, the refrigerating machine oil 15 is entangled from the discharge gas containing the refrigerating machine oil 15, and the refrigerant Only gas is discharged from the sealed container 9. Therefore, the amount of the refrigerating machine oil 15 released to the refrigeration air conditioner or the like can be reduced, and the performance deterioration of the refrigeration air conditioner or the like due to the oil rising and the performance deterioration of the hermetic rotary compressor 400 itself can be suppressed.

  The dimple processing is intended to increase the surface area, and it goes without saying that the same effect can be obtained even if the surface is drilled or processed into a wavy shape or a porous member such as a mesh is attached to the surface.

  1 Cylinder, 2 Upper bearing, 3 Lower bearing, 4 Crankshaft, 4b Main shaft, 4c Subshaft, 4d Eccentric shaft, 5 Rolling piston, 6 vane, 6a Vane groove, 7 Stator, 8 Rotor, 9 Sealed Container, 10 Discharge muffler, 10a Discharge hole, 11 Discharge pipe, 12 First oil level retaining plate, 12a Oil level retaining plate outer diameter, 12b Oil level retaining plate inner diameter, 12c Fixing part, 12d Bolt insertion hole, 13 Second Oil level holding plate, 15 refrigerating machine oil, 20 suction muffler, 21 suction pipe, 30 glass terminal, 31 lead wire, 40 fixing bolt, 100 hermetic rotary compressor, 101 compression mechanism, 102 electric motor, 110 discharge muffler, 200 Hermetic rotary compressor, 300 Hermetic rotary compressor, 301 Compression mechanism, 400 Hermetic rotary compressor, 412 First oil level retaining plate, 413 Second oil Surface holding plate.

Claims (2)

A compression mechanism that sucks and compresses refrigerant gas into a cylinder having a vane groove in which a vane reciprocates and discharges the refrigerant gas into a sealed container from a discharge hole of a discharge muffler, and an electric motor that drives the compression mechanism by a rotor A hermetic compressor housed in a hermetic container,
A first gap is provided at a height below the discharge hole of the discharge muffler at a predetermined distance from the upper end surface of the cylinder, and is a diameter that is equal to or greater than a diameter that covers the vane groove and smaller than an inner diameter of the sealed container. The board,
A second plate having a predetermined distance larger than the outer diameter of the rotor, provided at a predetermined distance from the lower end surface of the rotor and above the height position of the discharge hole of the discharge muffler;
With
The first plate is either dimpled or corrugated only on the rotor side surface, and the second plate is dimpled only on the surface opposite to the rotor side. A hermetic compressor that has been subjected to either wavy processing . The compression mechanism portion includes an upper bearing that supports a crankshaft, and the first plate is formed by extending a flange portion of the discharge muffler or a flange portion of the upper bearing in a radial direction. The hermetic compressor according to claim 1 .

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