JP2008121487A - Compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compressor preventing oil shortage of an oil reservoir part. <P>SOLUTION: An insulator 530 is held between a coil 520 and a stator core 510. An outer periphery wall part 531 of the insulator 530 extends over the tip of a compression element 2 side of an inner periphery wall part 532 of the insulator toward the compression element 2 side. Further, the outer periphery wall part 531 and the inner periphery wall part 532 guide lubricant oil in a hermetic vessel 1 to the inside in the radial direction of a stator 5 along with refrigerant gas, and flow it to the space radially inside the stator 5. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a compressor used in, for example, an air conditioner or a refrigerator.

Conventionally, the compressor includes a sealed container, a compression element disposed in the sealed container, and a motor that is disposed in the sealed container and drives the compression element via a shaft. The compression element has a bearing that supports the shaft, and the bearing has an oil discharge port that discharges lubricating oil supplied between the bearing and the shaft to the outside of the bearing. The motor has a rotor and a stator disposed on the outer side in the radial direction of the rotor (see JP-A-10-153188: Patent Document 1).
Japanese Patent Laid-Open No. 10-153188

  However, in the conventional compressor, the lubricating oil discharged from the oil discharge port of the bearing, together with the refrigerant gas discharged from the compression element into the sealed container, is a space between the stator and the sealed container. (Outer passage) and a space (inner passage) between the stator and the rotor.

  Therefore, the lubricating oil that has flowed to the downstream side (upper side) of the motor together with the refrigerant gas is obstructed by the refrigerant gas, and does not easily pass through the outer passage and the inner passage, so that the lubricating oil flows to the upstream side (lower side) of the motor. It becomes difficult to return.

  Then, there is a problem that the lubricating oil is accumulated on the upper side of the motor, and the oil level is cut off in the oil reservoir portion on the lower side of the motor. Due to the oil level cut, the lubricating oil in the oil reservoir cannot be effectively sent to the compression element and the motor via the shaft, and the reliability of the compressor is lowered.

  Then, the subject of this invention is providing the compressor which prevents the oil level cut | off of the said oil sump part.

In order to solve the above problems, the compressor of the present invention is:
A sealed container in which lubricating oil is stored at the bottom, a compression element disposed in the sealed container, and a motor disposed in the sealed container and driving the compression element via a shaft,
The motor has a rotor and a stator arranged on the outer side in the radial direction of the rotor,
The stator includes a stator core, a coil wound around the stator core, an outer guide portion disposed radially outward from the coil on the compression element side of the stator core, and the coil on the compression element side of the stator core. And an inner guide portion arranged radially inward than
The outer guide part extends to the compression element side from the end of the inner guide part on the compression element side,
The outer guide portion and the inner guide portion guide the lubricating oil in the sealed container to the radially inner side of the stator together with the refrigerant gas discharged from the compression element into the sealed container. .

  According to the compressor of the present invention, the outer guide portion extends to the compression element side from the end of the inner guide portion on the compression element side, and the outer guide portion and the inner guide portion are Since the lubricating oil in the sealed container is guided radially inward of the stator together with the refrigerant gas discharged from the compression element into the sealed container, the lubricating oil in the sealed container is It can flow in the space inside the stator in the radial direction. That is, the space inside the stator in the radial direction can be used as a passage dedicated to the flow of the lubricating oil and the refrigerant gas, and the space outside the radial direction of the stator can be used as a passage dedicated to the return of the lubricating oil.

  Therefore, the lubricating oil that has flowed to the downstream side (upper side) of the motor together with the refrigerant gas is efficiently returned to the upstream side (lower side) of the motor, and the oil reservoir on the upstream side (lower side) of the motor. Oil level can be prevented. Further, the heat generating portions of the stator and the rotor can be efficiently cooled by the lubricating oil flowing in the radial inner side of the stator.

  Moreover, in the compressor of one Embodiment, the said outer side guide part and the said inner side guide part are a part of insulators clamped between the said coil and the said stator core.

  According to the compressor of this embodiment, the outer guide portion and the inner guide portion are part of the insulator sandwiched between the coil and the stator core, and therefore the insulator can be used as the guide portion. Thus, the number of parts can be reduced.

  Further, in the compressor according to an embodiment, the stator core has a plurality of teeth portions protruding radially inward and arranged in the circumferential direction, and the coils are wound around the teeth portions, respectively. It is not wound over the teeth section.

  According to the compressor of this embodiment, since the coil of the stator is so-called concentrated winding, the coil can be easily wound around the teeth portion. Further, the stator can be efficiently cooled by passing lubricating oil together with the refrigerant gas between the adjacent coils.

  According to the compressor of the present invention, the outer guide portion extends to the compression element side from the end of the inner guide portion on the compression element side, and the outer guide portion and the inner guide portion are Since the lubricating oil in the sealed container is guided radially inward of the stator together with the refrigerant gas discharged from the compression element into the sealed container, it is possible to prevent the oil reservoir from being cut off.

  Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments.

  FIG. 1 is a longitudinal sectional view showing an embodiment of the compressor of the present invention. The compressor includes an airtight container 1, a compression element 2 disposed in the airtight container 1, and a motor 3 disposed in the airtight container 1 and driving the compression element 2 via the shaft 12. I have.

  This compressor is a so-called vertical high-pressure dome type rotary compressor, in which the compression element 2 is placed down and the motor 3 is placed up in the sealed container 1. The rotor 6 of the motor 3 drives the compression element 2 via the shaft 12.

  The compression element 2 sucks refrigerant gas from the accumulator 10 through the suction pipe 11. The refrigerant gas is obtained by controlling a condenser, an expansion mechanism, and an evaporator (not shown) that constitute an air conditioner as an example of a refrigeration system together with the compressor. This refrigerant gas is, for example, carbon dioxide, R410A, or R22.

  The compressor discharges compressed high-temperature and high-pressure refrigerant gas from the compression element 2 and fills the inside of the sealed container 1, and passes the gap between the stator 5 and the rotor 6 of the motor 3 through the motor. 3 is cooled, and then discharged from the discharge pipe 13 provided on the upper side of the motor 3 to the outside.

  An oil reservoir 9 for storing lubricating oil is formed at the bottom of the high-pressure region in the closed container 1. This lubricating oil moves from the oil reservoir portion 9 through an oil passage (not shown) provided in the shaft 12 to a sliding portion such as the bearing of the compression element 2 or the motor 3. Lubricate the sliding part. This lubricating oil is, for example, a polyalkylene glycol oil (such as polyethylene glycol or polypropylene glycol), an ether oil, an ester oil, or a mineral oil. The oil passage is a spiral groove provided on the outer peripheral surface of the shaft 12 or a hole provided in the shaft 12.

  The compression element 2 includes a cylinder 21 that is attached to the inner surface of the sealed container 1, and an upper end plate member 50 and a lower end plate member 60 that are attached to upper and lower open ends of the cylinder 21. Prepare. A cylinder chamber 22 is formed by the cylinder 21, the upper end plate member 50, and the lower end plate member 60.

  The upper end plate member 50 includes a disk-shaped main body 51 and a boss 52 provided upward in the center of the main body 51. The main body 51 and the boss 52 are inserted through the shaft 12.

  The end plate member 50 is an example of a support portion that supports the shaft 12. The end plate member 50 has an oil discharge port 50a. The oil discharge port 50 a discharges the lubricating oil supplied between the end plate member 50 and the shaft 12 through the oil passage (not shown) to the outside of the end plate member 50. Specifically, the oil discharge port 50a is formed in the upper end surface of the boss portion 52, and is a space between the outer peripheral surface of the shaft 12 and the inner peripheral surface of the boss portion 52.

  The main body 51 is provided with a discharge port 51 a communicating with the cylinder chamber 22. A discharge valve 31 is attached to the main body 51 so as to be located on the opposite side of the main body 51 from the cylinder 21. The discharge valve 31 is, for example, a reed valve, and opens and closes the discharge port 51a.

  A cup-type muffler cover 40 is attached to the main body 51 so as to cover the discharge valve 31 on the side opposite to the cylinder 21. The muffler cover 40 is fixed to the main body 51 by a fixing member 35 (such as a bolt). The muffler cover 40 is inserted through the boss portion 52.

  A muffler chamber 42 is formed by the muffler cover 40 and the upper end plate member 50. The muffler chamber 42 and the cylinder chamber 22 communicate with each other via the discharge port 51a.

  The muffler cover 40 has a hole 43. The hole 43 communicates the muffler chamber 42 with the outside of the muffler cover 40.

  The lower end plate member 60 includes a disc-shaped main body portion 61 and a boss portion 62 provided downward in the center of the main body portion 61. The main body 61 and the boss 62 are inserted through the shaft 12.

  In short, one end of the shaft 12 is supported by the upper end plate member 50 and the lower end plate member 60. That is, the shaft 12 is cantilevered. One end portion (support end side) of the shaft 12 enters the cylinder chamber 22.

  An eccentric pin 26 is provided on the support end side of the shaft 12 so as to be positioned in the cylinder chamber 22 on the compression element 2 side. The eccentric pin 26 is fitted to the roller 27. The roller 27 is disposed so as to be able to revolve in the cylinder chamber 22, and performs a compression action by the revolving motion of the roller 27.

  In other words, one end of the shaft 12 is supported by the housing 7 of the compression element 2 on both sides of the eccentric pin 26. The housing 7 includes the upper end plate member 50 and the lower end plate member 60.

  Next, the compression action of the cylinder chamber 22 will be described.

  As shown in FIG. 2, the cylinder chamber 22 is partitioned by a blade 28 provided integrally with the roller 27. That is, the chamber on the right side of the blade 28 has the suction pipe 11 opened on the inner surface of the cylinder chamber 22 to form a suction chamber (low pressure chamber) 22a. On the other hand, in the chamber on the left side of the blade 28, the discharge port 51a (shown in FIG. 1) opens on the inner surface of the cylinder chamber 22 to form a discharge chamber (high pressure chamber) 22b.

  Semi-cylindrical bushes 25, 25 are in close contact with both surfaces of the blade 28 for sealing. The blade 28 and the bushes 25, 25 are lubricated with the lubricating oil.

  Then, the eccentric pin 26 rotates eccentrically with the shaft 12, and the roller 27 fitted to the eccentric pin 26 contacts the outer peripheral surface of the roller 27 with the inner peripheral surface of the cylinder chamber 22, Revolve.

  As the roller 27 revolves in the cylinder chamber 22, the blade 28 advances and retreats with both side surfaces of the blade 28 being held by the bushes 25, 25. Then, a low-pressure refrigerant gas is sucked into the suction chamber 22a from the suction pipe 11, compressed in the discharge chamber 22b to a high pressure, and then a high-pressure refrigerant gas is supplied from the discharge port 51a (shown in FIG. 1). Discharge.

  Thereafter, as shown in FIG. 1, the refrigerant gas discharged from the discharge port 51 a is discharged to the outside of the muffler cover 40 via the muffler chamber 42.

  As shown in FIGS. 1 and 3, the motor 3 includes the rotor 6 and the stator 5 disposed on the radially outer side of the rotor 6 via an air gap.

  The rotor 6 includes a rotor body 610 and a magnet 620 embedded in the rotor body 610. The rotor body 610 has a cylindrical shape, and is made of, for example, laminated electromagnetic steel plates. The shaft 12 is attached to the central hole of the rotor body 610. The magnet 620 is a flat permanent magnet. The six magnets 620 are arranged at center angles at equal intervals in the circumferential direction of the rotor body 610.

  The stator 5 includes a stator core 510, a coil 520 wound around the stator core 510, an outer guide portion 501 disposed on the compression element 2 side of the stator core 510 on a radially outer side than the coil 520, and the stator core. 510 has an inner guide portion 502 disposed on the radially inner side of the coil 520 on the compression element 2 side. In FIG. 3, the coil 520 is partially omitted, and the outer guide portion 501 and the inner guide portion 502 are omitted.

  The stator core 510 is composed of a plurality of laminated steel plates, and is fixed to the closed container 1 by shrink fitting or the like. The stator core 510 has an annular portion 511 and nine teeth 512 that protrude radially inward from the inner peripheral surface of the annular portion 511 and are arranged at equal intervals in the circumferential direction.

  The coil 520 is a so-called concentrated winding that is wound around each of the tooth portions 512 and is not wound around the plurality of tooth portions 512. The motor 3 has a so-called 6 pole 9 slot. The rotor 6 is rotated together with the shaft 12 by an electromagnetic force generated in the stator 5 by passing a current through the coil 520.

  The outer guide portion 501 and the inner guide portion 502 are part of an insulator 530 that is sandwiched between the coil 520 and the stator core 510. The insulator 530 is disposed on each of both end surfaces of the stator core 510 in the axial direction, and is wound together with the stator core 510 by the coil 520. In FIG. 3, the insulator 530 is omitted.

  The insulator 530 is made of a heat-resistant resin material such as liquid crystal polymer (LCP), polybutylene terephthalate (PBT), polyphenylene sulfide (PPS), polyimide, or polyester.

  The insulator 530 includes an outer peripheral wall portion 531 disposed on the radially outer side of the coil 520 and an inner peripheral wall portion 532 disposed on the radially inner side of the coil 520. For example, the outer peripheral wall portion 531 and the inner peripheral wall portion 532 are formed in an annular shape having cuts at regular intervals in the circumferential direction.

  In the lower insulator 530 disposed on the compression element 2 side of the stator core 510, the outer peripheral wall portion 531 is the outer guide portion 501, and the inner peripheral wall portion 532 is the inner guide portion 502. .

  The outer guide portion 501 extends to the compression element 2 side from the end of the inner guide portion 502 on the compression element 2 side.

  The outer guide portion 501 and the inner guide portion 502 are located radially outside the oil discharge port 50a of the end plate member 50. The outer guide portion 501 extends farther from the stator core 510 than the oil discharge port 50a of the end plate member 50 when viewed from the direction perpendicular to the rotation axis 12a of the shaft 12.

  That is, the lower end surface 531a of the outer peripheral wall portion 531 is on the radially outer side and lower side than the oil discharge port 50a. The lower end surface 531a of the outer peripheral wall portion 531 is located below the lower end surface (that is, the coil end) of the coil 520.

  The outer guide portion 501 (the outer peripheral wall portion 531) and the inner guide portion 502 (the inner peripheral wall portion 532) receive the lubricating oil discharged from the oil discharge port 50a of the end plate member 50 as the compression element 2. The refrigerant gas discharged from the inside of the sealed container 1 is guided to the radially inner side of the stator 5 and flows into the radially inner space of the stator 5.

  That is, the space inside the stator 5 in the radial direction (hereinafter referred to as the inner passage) is a passage dedicated to the flow of the lubricating oil and the refrigerant gas, and the space outside the stator 5 in the radial direction (hereinafter referred to as the outer passage) It can be a passage dedicated to the return of the lubricating oil.

  Here, the inner passage refers to an air gap between the stator 5 and the rotor 6 and a space between the adjacent coils 520 and 520. The outer passage refers to a space between a core cut such as a concave groove or a D-cut surface provided on the outer peripheral surface of the stator core 510 and the inner peripheral surface of the sealed container 1.

  Accordingly, the lubricating oil on the upstream side (lower side) of the motor 3 is flowed together with the refrigerant gas to the downstream side (upper side) of the motor 3 through the inner passage as shown by the arrow A in FIG. As shown by the arrow B in FIG. 1, the lubricating oil that has flowed downstream (upper) of the motor is returned to the upstream (lower) of the motor through the outer passage, and the upstream (lower) of the motor. ) In the oil reservoir 9 can be prevented.

  More specifically, the inner peripheral wall portion 532 guides the refrigerant gas to an air gap between the stator 5 and the rotor 6 that is a space inside the inner peripheral wall portion 532.

  On the other hand, the outer peripheral wall portion 531 guides the refrigerant gas to a space between the adjacent coils 520 and 520 that is a space inside the outer peripheral wall portion 531. Further, since the outer guide portion 501 extends to the compression element 2 side rather than the end of the inner guide portion 502 on the compression element 2 side, the refrigerant gas blocked by the outer peripheral wall portion 531 is The vehicle passes over the inner guide portion 502 and is guided to the air gap between the stator 5 and the rotor 6.

  By preventing the oil from running out, the lubricating oil in the oil reservoir 9 can be effectively sent to the compression element 2 and the motor 3 through the shaft 12, thereby improving the reliability of the compressor. To do.

  Further, the coil 520 which is the heat generating portion of the stator 5 and the heat generating portion of the rotor 6 can be efficiently cooled by the lubricating oil flowing through the inner passage.

  Further, since the outer guide portion 501 and the inner guide portion 502 are part of the insulator 530, the insulator 530 can be used as the guide portions 501 and 502, and the number of parts can be reduced.

  Further, since the coil 520 of the stator 5 is so-called concentrated winding, the coil 520 can be easily wound around the tooth portion 512. Further, the stator 5 can be efficiently cooled by passing refrigerant gas between the adjacent coils 520 and 520.

  In addition, this invention is not limited to the above-mentioned embodiment. For example, the compression element 2 may be a rotary type in which a roller and a blade are separate bodies. As the compression element 2, a scroll type or a reciprocating type may be used in addition to the rotary type.

  The compression element 2 may be a two-cylinder type having two cylinder chambers. The number of the teeth portions 512 may be other than nine, and the coil 520 may be a so-called distributed winding in which the plurality of teeth portions 512 are wound.

  Further, the end plate member 50 as a support portion for supporting the shaft 12 may be formed integrally with the cylinder 21 instead of a member separate from the cylinder 21. Further, the outer guide portion 501 and the inner guide portion 502 are not part of the insulator 530 but may be other members, or may be formed integrally with the stator core 510.

  Further, the compression element 2 may be disposed above and the motor 3 may be disposed below. Further, instead of the oil passage provided in the shaft 12, a spiral groove may be provided on the inner surface of the end plate member 50.

It is a longitudinal section showing one embodiment of the compressor of the present invention. It is a top view of the principal part of a compressor. It is a cross-sectional view near the motor of the compressor.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Airtight container 2 Compression element 3 Motor 5 Stator 501 Outer guide part 502 Inner guide part 510 Stator core 520 Coil 530 Insulator 531 Outer peripheral wall part 531a Lower end surface 532 Inner peripheral wall part 6 Rotor 9 Oil reservoir part 12 Shaft 12a Rotating shaft 21 Cylinder 50 Upper side End plate member 50a Oil discharge port 60 Lower end plate member

Claims (2)

A sealed container (1) in which lubricating oil is stored at the bottom; a compression element (2) disposed in the sealed container (1); and a compression element (2) disposed in the sealed container (1). A motor (3) driven through a shaft (12),
The motor (3) includes a rotor (6) and a stator (5) disposed on the outer side in the radial direction of the rotor (6).
The stator (5) has a stator core (510), a coil (520) wound around the stator core (510), and a diameter closer to the compression element (2) of the stator core (510) than the coil (520). An outer guide portion (501) disposed on the outer side in the direction and an inner guide portion (502) disposed on the inner side in the radial direction than the coil (520) on the compression element (2) side of the stator core (510). Have
The outer guide part (501) extends to the compression element (2) side from the end of the inner guide part (502) on the compression element (2) side,
The outer guide portion (501) and the inner guide portion (502) are configured to supply the lubricating oil in the sealed container (1) together with the refrigerant gas discharged from the compression element (2) into the sealed container (1). The compressor is characterized by being guided radially inward of the stator (5). The compressor according to claim 1,
The outer guide part (501) and the inner guide part (502) are part of an insulator (530) sandwiched between the coil (520) and the stator core (510). Machine.

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