JP2008208839A - Compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a calm compressor with operating noise from a motor lessened by reducing the vibration of a stator due to pressure pulsation in a sealed vessel. <P>SOLUTION: In the sealed vessel 1, the stator 5 of the motor 3 is installed on two planes perpendicularly intersecting the center axis 1a of the sealed vessel 1. On the planes the stator 5 is welded to the vessel 1 at three welding points 8. This allows lessening of the moving amount along the center axis 1a of the stator 5 relative to the vessel 1. <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 stator of the motor was welded to the sealed container at the center in the vertical height direction of the stator (see Japanese Patent Application Laid-Open No. 2003-262192: Patent Document 1).
Japanese Patent Laying-Open No. 2003-262192 (FIG. 1)

  However, in the conventional compressor, since the central portion of the stator is welded to the sealed container, the amount of vertical movement of the stator with respect to the sealed container is large.

  That is, the stator is composed of a plurality of stacked steel plates, and the amount of steel plates between the central portion of the stator and the upper and lower ends of the stator that are welded to the sealed container is large, and there are a plurality of steel plates in between. The amount of the steel plates that were separated and moved up and down was large.

  Therefore, the pressure pulsation of the refrigerant in the closed container causes the plurality of steel plates to vibrate greatly, resulting in a problem that the operation sound of the motor is increased.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a silent compressor in which the vibration of the stator due to pressure pulsation in the sealed container is reduced to reduce the operating noise of the motor.

In order to solve the above problems, the compressor of the present invention is:
A sealed container;
A compression element disposed in the sealed container;
A motor disposed in the sealed container and driving the compression element via a shaft;
The stator of the motor is attached to the sealed container on at least two planes orthogonal to the central axis of the sealed container,
On each of the planes, the stator is welded to the sealed container at at least three welding points.

  According to the compressor of the present invention, the stator is attached to the airtight container on at least two planes orthogonal to the central axis of the airtight container, and on each plane, the stator is the airtight container. In addition, since welding is performed at least at three welding points, the amount of movement of the stator in the central axis direction relative to the sealed container can be reduced.

  That is, the stator is composed of a plurality of stacked steel plates, and the amount of the steel plate between the stator mounting portion attached to the sealed container and the end portion in the central axis direction of the stator can be reduced. Thus, it is possible to reduce the amount of movement of the plurality of steel plates in the meantime apart and moving in the central axis direction.

  Therefore, it is possible to reduce the vibration of the stator due to the pressure pulsation of the refrigerant in the closed container, and to realize a silent compressor that reduces the operation noise of the motor.

  In one embodiment, the stator has a plurality of stacked steel plates, each steel plate is covered with an insulating adhesive, and the adjacent steel plates are insulated from each other. It is bonded with a adhesive.

  Here, the insulating adhesive is, for example, an epoxy varnish.

  According to the compressor of this embodiment, since the adjacent steel plates of the stator are bonded to each other by an insulating adhesive, the plurality of steel plates are not separated, and the rigidity of the stator is improved. Thus, the vibration of the stator due to the pressure pulsation in the sealed container can be further reduced, and the operation sound of the motor can be further reduced.

The compressor of the present invention is
A sealed container;
A compression element disposed in the sealed container;
A motor disposed in the sealed container and driving the compression element via a shaft;
The stator of the motor is attached to the sealed container on one plane orthogonal to the central axis of the sealed container,
On this one plane, the stator is welded to the sealed container at at least three welding points,
The stator has a plurality of laminated steel plates,
Each steel plate is covered with an insulating adhesive,
The adjacent steel plates are characterized by being bonded to each other by the insulating adhesive.

  According to the compressor of the present invention, the stator is attached to the sealed container on one plane orthogonal to the central axis of the sealed container, and on the one plane, the stator is mounted on the sealed container. In addition, since the adjacent steel plates of the stator are bonded to each other with an insulating adhesive, the amount of movement of the stator in the central axis direction relative to the sealed container is reduced. it can.

  That is, the plurality of steel plates are not separated, the rigidity of the stator is improved, and the vibration of the stator due to the pressure pulsation of the refrigerant in the hermetic container can be reduced, and the operation sound of the motor is reduced. A silent compressor can be realized.

  Moreover, in the compressor of one Embodiment, the refrigerant | coolant in the said airtight container is a carbon dioxide.

  According to the compressor of this embodiment, since the refrigerant in the sealed container is carbon dioxide, the refrigerant of the carbon dioxide has a high pressure in the sealed container, but the stator of the stator due to the pressure pulsation of the refrigerant The vibration is reduced and the driving sound of the motor is reduced.

  According to the compressor of the present invention, the stator is attached to the airtight container on at least two planes orthogonal to the central axis of the airtight container, and on each plane, the stator is the airtight container. In addition, since the welding is performed at at least three welding points, the vibration of the stator due to the pressure pulsation of the refrigerant in the sealed container can be reduced, and a silent compressor in which the operation noise of the motor is reduced can be realized.

  Further, according to the compressor of the present invention, the stator is attached to the sealed container on one plane orthogonal to the central axis of the sealed container, and on the one plane, the stator is Since the steel plates adjacent to each other are welded to the sealed container at at least three welding points, and the adjacent steel plates of the stator are bonded to each other by an insulating adhesive, the vibration of the stator due to the pressure pulsation of the refrigerant in the sealed container. Therefore, it is possible to realize a silent compressor that reduces the operation noise of the motor.

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

(First embodiment)
FIG. 1 is a longitudinal sectional view showing a first embodiment of a compressor according to 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 high-pressure dome type rotary compressor, and the compressor element 2 is disposed below and the motor 3 is disposed above 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.

  The refrigerant gas is carbon dioxide and has a high pressure of about 12 MPa in the closed container 1. A refrigerant such as R410A or R22 may be used as the refrigerant.

  The compressor discharges the compressed high-temperature and high-pressure refrigerant gas from the compression element 2 to fill the inside of the hermetic 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 to the outside. Lubricating oil 9 is stored in the lower portion of the high-pressure region in the sealed container 1.

  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 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, in the chamber on the right side of the blade 28, the suction pipe 11 opens 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. Lubrication is performed between the blade 28 and the bushes 25, 25 with the lubricating oil 9.

  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 and a coil 520 wound around the stator core 510. In FIG. 3, the coil 520 is partially omitted.

  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 teeth 512 and is not wound around the plurality of teeth 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.

  As shown in FIG. 1, the stator core 510 is attached to the sealed container 1 on two planes orthogonal to the central axis 1 a of the sealed container 1. On each plane, the outer peripheral surface of the stator core 510 is welded to the sealed container 1 at three welding points 8 as shown in FIG. The central axis 1 a of the sealed container 1 coincides with the rotation axis of the shaft 12.

  All the welding points 8 are of equal pitch or unequal pitch. That is, all of the central angles between the adjacent welding points 8 and 8 are the same, or at least one of the central angles between the adjacent welding points 8 and 8 is another central angle. And different.

  The welding points 8 on the two planes may or may not overlap as viewed from the direction of the central axis 1a.

  The stator core 510 is composed of a plurality of stacked steel plates 15. All the steel plates 15 are fixed integrally by caulking, for example.

  According to the compressor having the above configuration, the stator 5 is attached to the sealed container 1 on two planes orthogonal to the central axis 1a of the sealed container 1, and the stator 5 is mounted on each plane. Is welded to the sealed container 1 at three welding points 8, the amount of movement of the stator 5 relative to the sealed container 1 in the direction of the central axis 1 a (vertical direction) can be reduced.

  That is, the amount of the steel plate 15 between the attachment portion of the stator 5 attached to the sealed container 1 and the end portion of the stator 5 in the direction of the central axis 1a can be reduced, and a plurality of the steel plates 15 between them can be reduced. The amount by which the steel plate 15 is separated and moves in the direction of the central axis 1a can be reduced. In addition, since the several steel plate 15 between the adjacent attaching parts of the said stator 5 is positioned by the said attaching part, it does not move to the said central axis 1a direction.

  Therefore, the vibration of the stator 5 due to the pressure pulsation of the refrigerant in the sealed container 1 can be reduced, and a silent compressor in which the operation sound of the motor 3 is reduced can be realized. In particular, when this compressor is used for eco-hot water supply that uses midnight power, this compressor can be used at midnight because it can achieve quietness at midnight.

  In addition, the carbon dioxide refrigerant has a high pressure in the sealed container 1, but the vibration of the stator 5 due to the pressure pulsation of the refrigerant is reduced, and the operation sound of the motor 3 is reduced.

  Next, the compressor of the present invention is compared with the conventional compressor with respect to the vertical vibration of the stator by a test using a vibrator.

  As shown in the longitudinal sectional view of FIG. 4A and the plan view of FIG. 4B, in the compressor of the present invention, the stator 5 is placed on the sealed container 1 on two planes orthogonal to the central axis 1 a of the sealed container 1. The stator 5 is welded to the sealed container 1 at four welding points 8 on each plane. On the other hand, in the conventional compressor, as shown by the phantom line in FIG. 4A, the stator 5 is welded to the hermetic container 1 at four welding points 8 at the center in the vertical direction of the stator 5. . In addition, the compressor of this invention and the conventional compressor are shown with the same code | symbol.

  The four welding points 8 are at an equal pitch. On the stator core 510 of the stator 5, the first acceleration sensor 101 is attached on a straight line connecting the central axis 1 a and the one welding point 8. On the stator core 510 of the stator 5, the second acceleration sensor 102 is attached on the bisector of the central angle between the adjacent welding points 8 and 8. A vibrator 100 is attached to the lower surface of the closed container 1.

  Then, the vibration is applied to the stator 5 in the vertical direction together with the sealed container 1 by the vibrator 100, and the top surface of the stator core 510 (that is, the second acceleration sensor 102). Then, the vertical acceleration of the upper steel plate 15) is measured.

  Then, the relationship between the vibration frequency of the vibrator 100 and the vertical vibration acceleration of the upper surface of the stator core 510 is obtained.

  The results measured by the first acceleration sensor 101 are shown in FIG. 5A, and the results measured by the second acceleration sensor 102 are shown in FIG. 5B. In FIG. 5A and FIG. 5B, the result of the compressor of this invention is shown as a continuous line, and the result of the conventional compressor is shown as a dotted line.

  As can be seen from FIGS. 5A and 5B, in the conventional compressor, when the vibration frequency of the vibrator 100 is 400 Hz, the vibration acceleration is significantly larger than other vibration frequencies. On the other hand, in the compressor of the present invention, when the vibration frequency is 480 Hz, the vibration acceleration is larger than the other vibration frequencies. This vibration acceleration is higher than the maximum vibration acceleration of the conventional compressor. Very small.

  That is, the compressor of the present invention can reduce the vertical vibration of the stator as compared with the conventional compressor. In addition, since the frequency of the pressure pulsation of the refrigerant in the closed container 1 which is a problem with the operation sound is generally 1 kHz or less, particularly in the vicinity of 400 Hz, in a conventional compressor, due to the pressure pulsation of the refrigerant, Although the vibration of the stator increases, the compressor of the present invention can reduce the vibration of the stator.

(Second Embodiment)
FIG. 6 shows a second embodiment of the compressor of the present invention. In the second embodiment, the configuration of the stator is different from that in the first embodiment.

  In the stator 105 of the second embodiment, the stator core 1510 has a plurality of stacked steel plates 15, and the adjacent steel plates 15 and 15 are bonded to each other by an insulating adhesive 16. The insulating adhesive 16 is, for example, an epoxy varnish.

  Therefore, the plurality of steel plates 15 are not separated, the rigidity of the stator 105 is improved, and the vibration of the stator 105 due to pressure pulsation in the sealed container 1 is further reduced, so that the operation of the motor 3 is performed. Sound can be further reduced.

  When the entire surface of each steel plate 15 is covered with the insulating adhesive 16, the rigidity of the stator 105 is further improved, and the operation sound of the motor 3 can be further reduced.

  Next, regarding the operation sound of the compressor, a compressor in which a plurality of steel plates are bonded with varnish and a compressor in which the plurality of steel plates are not bonded with varnish are compared.

  FIG. 7 shows the relationship between the fitting size between the stator and the hermetic container and the sound pressure of the compressor when the frequency is 400 Hz. The horizontal axis shows the tolerance between the stator and the sealed container, and a positive value is a gap fitting state and a negative value is an interference fitting state. The vertical axis represents the sound pressure of the compressor. A compressor with varnish is shown by a solid line, and a compressor without varnish is shown by a dotted line.

  As can be seen from FIG. 7, when the fit dimension between the stator and the sealed container is a positive value, that is, when the stator and the sealed container are in a gap fitting state, the compressor with the varnish Compared with the compressor without, the sound pressure of the compressor can be greatly reduced.

  FIG. 8 shows the relationship between the frequency and the gain (vibration sound) when the fitting dimension between the stator and the hermetic container is 85 μm for the compressor with varnish and the compressor without varnish. The horizontal axis indicates the frequency, and the vertical axis indicates the gain. A compressor with varnish is shown by a solid line, and a compressor without varnish is shown by a dotted line.

  As can be seen from FIG. 8, the compressor without varnish has a large gain at a frequency near 400 Hz, whereas the compressor with varnish has a small gain at a frequency near 400 Hz. Therefore, the frequency of the pressure pulsation of the refrigerant in the closed container 1 which causes a problem with the operation sound is generally 1 kHz or less, particularly in the vicinity of 400 Hz. As compared with the above, the operation sound of the compressor due to the pressure pulsation of the refrigerant can be reduced.

(Third embodiment)
FIG. 9 shows a third embodiment of the compressor of the present invention. In the third embodiment, the configuration of the stator is different from that in the first embodiment.

  The stator 205 according to the third embodiment is attached to the sealed container 1 on one plane orthogonal to the central axis 1a of the sealed container 1. On this one plane, the stator 205 is welded to the sealed container 1 at at least three welding points 8. Specifically, the central portion of the stator core 2510 in the direction of the central axis 1a (vertical direction) is welded to the sealed container 1.

  The stator core 2510 has a plurality of stacked steel plates 15, and the adjacent steel plates 15 and 15 are bonded to each other with an insulating adhesive 16. Specifically, the entire surface of each steel plate 15 is covered with the insulating adhesive 16. The insulating adhesive 16 is, for example, an epoxy varnish.

  According to the compressor having this configuration, the stator 205 is attached to the hermetic container 1 on one plane orthogonal to the central axis 1a of the hermetic container 1, and on the one plane, the stator 205 is welded to the sealed container 1 at at least three welding points 8, and the adjacent steel plates 15 and 15 of the stator 205 are bonded to each other by the insulating adhesive 16. The amount of movement of the stator 205 relative to the hermetic container 1 in the direction of the central axis 1a can be reduced.

  That is, the plurality of steel plates 15 are not separated, the rigidity of the stator 205 is improved, and the vibration of the stator 205 due to the pressure pulsation of the refrigerant in the sealed container 1 can be reduced. A silent compressor with low operating noise can be realized.

  In particular, when carbon dioxide is used as the refrigerant, the refrigerant has a high pressure in the sealed container 1, but the vibration of the stator 205 due to the pressure pulsation of the refrigerant is reduced, and the operation sound of the motor 3 is low. Become.

  Further, by covering the entire surface of each steel plate 15 with the insulating adhesive 16, the rigidity of the stator 205 can be further improved and the operation sound of the motor 3 can be further reduced.

  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 coil 520 may be a so-called distributed winding wound around the plurality of teeth 512.

  In the first and second embodiments, the stators 5 and 105 may be attached to the sealed container 1 on three or more planes orthogonal to the central axis 1a of the sealed container 1. Good. Further, on each of the planes, the stators 5 and 105 may be welded to the sealed container 1 at four or more welding points 8.

  Further, in the second and third embodiments, in addition to the insulating adhesive 16, all the steel plates 15 may be integrally fixed by a fixing tool such as a bolt or a rivet, or the above The end surfaces of all the steel plates 15 may be integrally fixed by welding, and the rigidity of the stator can be improved.

It is a longitudinal section showing a 1st embodiment of a 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. It is a longitudinal cross-sectional view of the compressor used for the test of the vibration of the up-down direction of a stator. It is a top view of the compressor used for the test of the vibration of the up-down direction of a stator. It is a graph which shows the result measured by the 1st acceleration sensor. It is a graph which shows the result measured by the 2nd acceleration sensor. It is an expanded sectional view showing a 2nd embodiment of the compressor of the present invention. It is a graph which shows the relationship between the fitting dimension of a stator and an airtight container, and the sound pressure of a compressor regarding the compressor with a varnish and the compressor without a varnish. It is a graph which shows the relationship between a frequency and a gain regarding the compressor with a varnish, and the compressor without a varnish. It is a longitudinal cross-sectional view which shows 3rd Embodiment of the compressor of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Airtight container 1a Central axis 2 Compression element 3 Motor 5,105,205 Stator 510,1510,2510 Stator core 6 Rotor 8 Welding point 12 Shaft 15 Steel plate 16 Insulating adhesive 21 Cylinder 100 Exciter 101 1st acceleration sensor 102 Second acceleration sensor

Claims (4)

A sealed container (1);
A compression element (2) arranged in the sealed container (1);
A motor (3) disposed in the sealed container (1) and driving the compression element (2) via a shaft (12);
The stator (5, 105) of the motor (3) is attached to the sealed container (1) on at least two planes orthogonal to the central axis (1a) of the sealed container (1),
On each said plane, the said stator (5,105) is welded to the said airtight container (1) by the welding point (8) of at least 3 points | pieces, The compressor characterized by the above-mentioned. The compressor according to claim 1,
The stator (105) has a plurality of stacked steel plates (15),
Each steel plate (15) is covered with an insulating adhesive (16),
The compressor characterized in that the adjacent steel plates (15, 15) are bonded to each other by the insulating adhesive (16). A sealed container (1);
A compression element (2) arranged in the sealed container (1);
A motor (3) disposed in the sealed container (1) and driving the compression element (2) via a shaft (12);
The stator (205) of the motor (3) is attached to the sealed container (1) on one plane perpendicular to the central axis (1a) of the sealed container (1),
On this one plane, the stator (205) is welded to the sealed container (1) at at least three welding points (8),
The stator (205) has a plurality of laminated steel plates (15),
Each steel plate (15) is covered with an insulating adhesive (16),
The compressor characterized in that the adjacent steel plates (15, 15) are bonded to each other by the insulating adhesive (16). The compressor according to any one of claims 1 to 3,
The compressor characterized in that the refrigerant in the sealed container (1) is carbon dioxide.

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