JP2012102665A - Compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compressor in which deflection of a shaft due to a compressed gas pressure and centrifugal force during operation can be suppressed.SOLUTION: First and second energizing members 71 and 72 energize a roller 27 in a direction for canceling the compressed gas pressure in a cylinder 21 which a roller 27 receives. Thereby deflection of the shaft 12 due to compressed gas pressure during operation can be suppressed.

Description

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

  2. Description of the Related Art Conventionally, there is a compressor including a compression element and a motor that drives the compression element via a shaft (see JP 2009-2298 A: Patent Document 1).

  The compression element includes a cylinder and a roller that is externally fitted to the shaft and disposed in the cylinder. A blade is fixed to the roller.

  However, in the conventional compressor, the roller receives a compressed gas pressure in the cylinder during operation, and the shaft is bent due to the compressed gas pressure. At this time, the shaft also received a very small centrifugal force of the roller as compared with the compressed gas pressure.

JP 2009-2298 A

  SUMMARY OF THE INVENTION An object of the present invention is to provide a compressor that can suppress shaft deflection due to compressed gas pressure and centrifugal force during operation.

In order to solve the above problems, the compressor of the present invention is:
A compression element;
A motor for driving the compression element via a shaft;
The compression element is
A cylinder,
A swinging roller that is externally fitted to the shaft and disposed in the cylinder and to which a blade is fixed;
And a first urging member that urges the roller in a direction to cancel the compressed gas pressure in the cylinder received by the roller.

  According to the compressor of the present invention, the first urging member urges the roller in a direction to cancel the compressed gas pressure in the cylinder received by the roller, so that the shaft by the compressed gas pressure during operation is used. Can be suppressed. At this time, it is possible to suppress the deflection of the shaft due to the centrifugal force of the roller which is very small compared to the compressed gas pressure. For this reason, the usage amount of the balance weight attached to the rotor of the motor can be reduced, and the load of the bending moment can be reduced, so that vibration due to the swinging of the rotor of the motor can be reduced and the shaft can be prevented from hitting one side.

In the compressor of one embodiment,
A second biasing member that biases the roller in a direction to cancel the compressed gas pressure in the cylinder received by the roller;
The second biasing member biases the roller in a direction different from the direction in which the first biasing member biases the roller.

  According to the compressor of this embodiment, since the second urging member is provided, the deflection of the shaft during operation is more reliably suppressed.

  In the compressor according to an embodiment, the first urging member may be disposed in a direction opposite to a direction in which the compressed gas pressure in the cylinder received by the roller is canceled during a part of the gas compression stroke by the roller. The roller is energized.

  According to the compressor of this embodiment, the first urging member urges the roller in a direction opposite to the direction in which the compressed gas pressure is canceled in a part of the gas compression stroke by the roller. The first urging member does not always need to urge the roller in a certain direction (for example, has a tensile action on the roller), and the design range of selection and installation of the first urging member is expanded.

In the compressor of one embodiment,
The compression element has an end plate attached to an end face of the cylinder;
The first urging member is attached to the end plate.

  According to the compressor of this embodiment, since the first urging member is attached to the end plate instead of the cylinder, installation of the first urging member is facilitated.

  According to the compressor of the present invention, the first urging member urges the roller in a direction in which the compressed gas pressure and centrifugal force in the cylinder received by the roller are canceled. The bending of the shaft due to pressure can be suppressed.

It is sectional drawing which shows 1st Embodiment of the compressor of this invention. It is a top view of the principal part of a compressor. It is explanatory drawing explaining the positional relationship with respect to the cylinder of a roller. It is a graph which shows the relationship between the revolution angle of a roller, and the load which a roller receives. It is a graph which shows the load of the X direction and Y direction which a roller receives. It is sectional drawing which shows 2nd Embodiment of the compressor of this invention.

  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 a sealed container 1, a compression element 2 disposed in the sealed container 1, and a motor 3 disposed in the sealed container 1 and driving the compression element 2 via a shaft 12. ing.

  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 is, for example, carbon dioxide, HFC such as HC or R410A, or HCFC such as R22.

  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 provided on the upper side of the motor 3 to the outside.

  An oil reservoir 9 in which lubricating oil is stored is formed in the lower portion 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 motor 3 includes the rotor 6 and the stator 5 disposed so as to surround the outer peripheral side of the rotor 6.

  The rotor 6 includes a cylindrical rotor body 610 and a plurality of magnets 620 embedded in the rotor body 610. The rotor body 610 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 plurality of magnets 620 are arranged at equally spaced center angles in the circumferential direction of the rotor body 610.

  The stator 5 includes a cylindrical stator core 510 and a coil 520 wound around the stator core 510. The stator core 510 is composed of a plurality of laminated steel plates, and is fitted into the sealed container 1 by shrink fitting or the like. The coil 520 is wound around each tooth portion of the stator core 510, and the coil 520 is a so-called concentrated winding.

  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 50 and a lower end plate 60 that are attached to upper and lower open ends of the cylinder 21. A cylinder chamber 22 is formed by the cylinder 21, the upper end plate 50 and the lower end plate 60.

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

  One end side of the shaft 12 is fixed to the rotor 6, and the other end side of the shaft 12 is supported by upper and lower end plates 50 and 60 as bearings. That is, the shaft 12 is cantilevered. The other end side (support end side) of the shaft 12 enters the cylinder chamber 22.

  The support end side of the shaft 12 has an eccentric portion 26 disposed in the cylinder chamber 22 of the compression element 2. A roller 27 is fitted on the eccentric portion 26. The roller 27 is disposed in the cylinder chamber 22 so as to be capable of revolving (swingable), and performs a compression action by the revolving motion of the roller 27.

  As shown in FIG. 2, the cylinder chamber 22 is partitioned by a blade 28 fixed to 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.

  The eccentric part 26 rotates eccentrically with the shaft 12, and the roller 27 fitted on the eccentric part 26 contacts the inner peripheral surface of the cylinder chamber 22 with the outer peripheral surface of the roller 27 revolving. To do.

  As the roller 27 revolves in the cylinder chamber 22, the blade 28 advances and retreats while both side surfaces of the blade 28 are 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. The refrigerant gas discharged from the discharge port 51a is discharged to the outside of the muffler cover 40 via the muffler chamber 42.

  The roller 27 is urged by a first urging member 71 in a direction to cancel the compressed gas pressure in the cylinder 21 received by the roller 27. The first urging member 71 is, for example, a tension spring. One end of the first urging member 71 is attached to the tip of the blade 28, and the other end of the first urging member 71 is attached to the cylinder 21. For example, the first urging member 71 is disposed in a recess (not shown) provided in the cylinder 21. The first urging member 71 is disposed in the concave portion so as to extend in a planar direction orthogonal to the axis of the shaft 12.

  The roller 27 is urged by a second urging member 72 different from the first urging member 71 in a direction to cancel the compressed gas pressure in the cylinder 21 received by the roller 27. The second biasing member 72 biases the roller 27 in a direction different from the direction in which the first biasing member 71 biases the roller 27. Similar to the first urging member 71, the second urging member 72 is attached to the cylinder 21 and the blade 28.

  Here, as shown in FIG. 3, the positional relationship of the roller 27 with respect to the cylinder 21 (cylinder chamber 22) is defined. When the roller 27 is at the top dead center position, the revolution angle of the roller 27 around the center of the cylinder chamber 22 is 0 °, and when the roller 27 revolves from the top dead center position at the bottom dead center position. The revolution angle of the roller 27 around the center of the cylinder chamber 22 is 180 °. The roller 27 oscillates in the cylinder 21 in order as indicated by the white arrow. The direction connecting the top dead center and the bottom dead center is the Y direction, and the direction orthogonal to the Y direction is the X direction.

  When the roller 27 is at a position of 180 °, the roller 27 receives a force in the direction in which the blade 28 enters the cylinder chamber 22 (downward direction in the figure) due to the compressed gas pressure. Therefore, the first urging member 71 and the second urging member 72 urge the roller 27 in the direction in which the blade 28 retreats from the cylinder chamber 22 (upward direction in the drawing).

  On the other hand, when the roller 27 is at the position of 0 °, the roller 27 receives a force in the direction in which the blade 28 retreats from the cylinder chamber 22 (upward direction in the drawing) due to the compressed gas pressure. Therefore, the first urging member 71 and the second urging member 72 urge the roller 27 in the direction in which the blade 28 enters the cylinder chamber 22 (downward direction in the drawing).

  Next, the simulation about the load which the roller 27 receives during the operation of the compressor will be described.

  FIG. 4 shows the load that the roller receives when the revolution angle of the roller changes. The case where there is a spring as the first urging member 71 and the second urging member 72 is shown by a solid line, and the case where there is no spring as the first urging member 71 and the second urging member 72 is shown by a two-dot chain line. The horizontal axis indicates the revolution angle of the roller (see FIG. 3), and the vertical axis indicates the load applied to the roller.

  As shown in FIG. 4, when there is no spring, the roller receives a compressed gas pressure or centrifugal force, and becomes a large load exceeding 1000 N, for example, when the revolution angle is 220 °. The compressed gas pressure is greater than the centrifugal force. On the other hand, when there is a spring, the roller 27 receives a compressed gas pressure and a centrifugal force. However, due to the biasing in the cancel direction of the spring, for example, when the revolution angle is 220 °, the load becomes smaller than 800N. That is, when there is a spring, the load received by the roller can be reduced on average as compared to when there is no spring.

  FIG. 5 shows the loads in the X and Y directions that the roller receives. The case where there is a spring is indicated by a solid line, and the case where there is no spring is indicated by a two-dot chain line. The horizontal axis represents the load in the X direction (see FIG. 3) applied to the roller, and the vertical axis represents the load in the Y direction (see FIG. 3) applied to the roller.

  As shown in FIG. 5, when there is a spring, the load that the roller receives in the X direction and the Y direction can be reduced on average, compared to the case where there is no spring.

  According to the compressor configured as described above, the first urging member 71 and the second urging member 72 apply the roller 27 in a direction to cancel the compressed gas pressure in the cylinder 21 received by the roller 27. Therefore, the bending of the shaft 12 due to the compressed gas pressure during operation can be suppressed. At this time, it is possible to suppress the deflection of the shaft due to the centrifugal force of the roller which is very small compared to the compressed gas pressure. For this reason, the amount of use of the balance weight attached to the rotor 6 of the motor 3 can be reduced, and the load of the bending moment can be reduced, so that the vibration caused by the swing of the rotor 6 of the motor 3 can be reduced and the shaft 12 can be prevented from hitting one side. it can.

  The first urging member 71 and the second urging member 72 are opposite to the direction in which the compressed gas pressure in the cylinder 21 received by the roller 27 is canceled during a part of the gas compression stroke by the roller 27. Alternatively, the roller 27 may be biased. Therefore, the first urging member 71 and the second urging member 72 do not always need to urge the roller 27 in a certain direction (for example, have a pulling action on the roller 27), and the first urging member. The design range of selection and installation of 71 and the second urging member 72 is expanded.

  Note that the second urging member 72 may be omitted and only the first urging member 71 may be provided, and the bending of the shaft 12 during operation can be suppressed only by the first urging member 71. .

(Second Embodiment)
FIG. 6 shows a second embodiment of the compressor of the present invention. The difference from the first embodiment will be described. In the second embodiment, the attachment position of the first urging member is different. Note that the same reference numerals as those in the first embodiment have the same configurations as those in the first embodiment, and thus description thereof is omitted.

  As shown in FIG. 6, the first biasing member 71 is attached to the upper end plate 50 </ b> A of the compression element 2. The end plate 50 </ b> A is provided with a recess 50 a on the surface facing the blade 28. The first urging member 71 is disposed in the recess 50 a so as to extend in the same direction as the axis of the shaft 12. One end of the first urging member 71 is attached to the bottom surface of the recess 50 a, and the other end of the first urging member 71 is attached to the blade 28.

  Therefore, since the first urging member 71 is attached not to the cylinder 21 but to the upper end plate 50A, the installation of the first urging member 71 is facilitated. The first urging member 71 may be attached to the lower end plate 60 instead of the upper end plate 50A. Although the second urging member 72 is omitted, the second urging member 72 may be installed similarly to the first urging member 71.

  In addition, this invention is not limited to the above-mentioned embodiment. For example, the feature points of the first and second embodiments may be variously combined. Further, the first and second urging members may be directly attached to the roller instead of the blade. The first and second urging members may be compression springs as long as the rollers are urged in a direction to cancel the compressed gas pressure, in addition to the tension springs. Further, the first and second urging members may be elastic bodies such as rubber in addition to the springs. Further, the first and second urging members may be in any positions as long as the rollers are urged in a direction to cancel the compressed gas pressure. Further, the number of urging members may be increased. Further, the urging member may urge the roller in a direction to cancel the force obtained by adding the centrifugal force of the roller to the compressed gas pressure. In addition to the rotary type, a scroll type or a reciprocating type may be used as the compression element. In addition to the vertical type, a horizontal type may be used as the compressor. Moreover, it is good also as what is called distributed winding which wound the coil over several teeth part.

DESCRIPTION OF SYMBOLS 1 Airtight container 2 Compression element 3 Motor 5 Stator 510 Stator core 520 Coil 6 Rotor 610 Rotor main body 620 Coil 12 Shaft 21 Cylinder 22 Cylinder chamber 26 Eccentric part 27 Roller 28 Blade 50, 50A Upper end plate 50a Recessed part 60 Lower end plate 71 1st urging member 72 2nd urging member

Claims (4)

A compression element (2);
A motor (3) for driving the compression element (2) via a shaft (12),
The compression element (2)
A cylinder (21);
An oscillating roller (27) fitted on the shaft (12) and disposed in the cylinder (21) and having a blade (28) fixed thereto;
And a first urging member (71) for urging the roller (27) in a direction to cancel the compressed gas pressure in the cylinder (21) received by the roller (27). . The compressor according to claim 1,
A second biasing member (72) for biasing the roller (27) in a direction to cancel the compressed gas pressure in the cylinder (21) received by the roller (27);
The second biasing member (72) biases the roller (27) in a direction different from the direction in which the first biasing member (71) biases the roller (27). Compressor. The compressor according to claim 1 or 2,
The first urging member (71) is opposite to the direction in which the compressed gas pressure in the cylinder (21) received by the roller (27) is canceled during a part of the gas compression stroke by the roller (27). A compressor characterized by urging the roller (27) in a direction. The compressor according to any one of claims 1 to 3,
The compression element (2) has an end plate (50a) attached to the end face of the cylinder (21),
The compressor characterized in that the first urging member (71) is attached to the end plate (50a).

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