JP2017133474A - Rotary compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary compressor capable of preventing the seizure of a piston at an end face thereof.SOLUTION: The rotary compressor includes a cylinder (21) having a cylinder chamber (22) inside, a shaft (12) having a main shaft (25) and an eccentric shaft part (26) eccentric to the main shaft (25), the eccentric shaft part (26) being arranged inside the cylinder chamber (22), an end plate member (50) disposed at one end in the axial direction of the cylinder (21) and having a discharge port (51a), an annular roller part (27) whose inner peripheral face is fitted to the outer peripheral face of the eccentric shaft part (26) and which is revolved inside the cylinder chamber (22), and a blade part (90) for partitioning the cylinder chamber (22) into a low pressure chamber and a high pressure chamber together with the roller part (27). At least on the end face of the roller part (27) at the side of the end plate member (50), a rotatable annular member (82) is provided.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a rotary compressor.

  Conventionally, as a rotary compressor, there is one described in Patent Document 1. The rotary compressor includes two end plate members, a cylinder disposed between the end plate members and having a cylinder chamber therein, and a piston having a roller portion and a blade portion disposed in the cylinder chamber. Yes.

  In the rotary compressor, a concave portion is provided on one of the end faces of the piston facing the end plate member. As a result, the contact area with the end plate member is reduced, heat generation at the end face of the piston is suppressed, and seizure of the end face of the piston is made difficult to occur.

Japanese Patent No. 5516798

  The present inventor has found a new means that can prevent seizure of the end face of the piston, which is not disclosed in the prior art including Patent Document 1.

  That is, the subject of this invention is providing the rotary compressor which can prevent the burning of the end surface of a piston.

In order to solve the above problems, the rotary compressor of the present invention is
A cylinder having a cylinder chamber inside;
A shaft having a main shaft and an eccentric shaft portion eccentric to the main shaft, and the eccentric shaft portion disposed in the cylinder chamber;
An end plate member disposed at one end of the cylinder in the axial direction and provided with a discharge port;
An annular roller portion whose inner peripheral surface is fitted to the outer peripheral surface of the eccentric shaft portion and revolves inside the cylinder chamber;
A blade portion that partitions the cylinder chamber into a low pressure chamber and a high pressure chamber together with the roller portion;
With
An annular member capable of rotating is provided at least on an end surface of the roller portion on the end plate member side.

  According to the said structure, the annular member which can autorotate is provided in the end surface by the side of the end plate member of the roller part revolving inside a cylinder chamber. That is, since the annular member rotates in conjunction with the revolution of the roller portion, the relative speed between the contact surfaces of the end plate member, the annular member, and the end surface of the roller portion is reduced. For this reason, the emitted-heat amount of the end surface of a roller part can be suppressed, and the burning of the end surface of a piston can be prevented.

  Moreover, the heat which generate | occur | produced in the end surface of a roller part is diffused because an annular member rotates. For this reason, the local temperature rise of the end surface of a piston can be prevented.

In the rotary compressor of one embodiment,
The annular member is provided outside the roller portion in the radial direction.

  According to the above embodiment, since the annular member is provided on the outer side in the radial direction of the roller portion having a high peripheral speed and a large amount of heat generation, the effect of suppressing the heat generation amount on the end surface of the roller portion can be enhanced.

In the rotary compressor of one embodiment,
A part of the roller portion is interposed between the inner peripheral surface of the annular member and the outer peripheral surface of the eccentric shaft portion.

  According to the above embodiment, the space between the annular member and the roller portion or the blade portion is sealed by the centrifugal force acting on the annular member due to the revolution of the roller portion and the rotation of the annular member. For this reason, the performance fall of a compressor can be prevented.

In the rotary compressor of one embodiment,
The annular member is provided inside the roller portion in the radial direction.

  According to the embodiment, for example, the annular member can be easily rotated by arranging the annular member so as to be in contact with the eccentric shaft portion.

In the rotary compressor of one embodiment,
The annular member is disposed so that the outer peripheral surface faces the end of the blade portion on the roller portion side,
The blade portion has an opening at the end on the roller side, a storage portion connected to the opening, a communication portion connecting the storage portion and the outside of the cylinder chamber, and a storage portion. And an end portion on the annular member side has a seal member protruding from the opening.

  According to the embodiment, the seal member is pressed against the annular member by the high pressure outside the cylinder chamber. For this reason, the space between the annular member and the blade portion is sealed, and the performance degradation of the compressor can be prevented.

  The rotary compressor of the present invention can prevent seizure of the end face of the piston.

It is a longitudinal cross-sectional view of the rotary compressor of 1st Embodiment of this invention. It is the top view seen from the discharge port side of the piston of the rotary compressor of FIG. FIG. 3 is a cross-sectional view taken along line III-III in FIG. 2. It is the top view seen from the discharge port side of the principal part of the compression mechanism part of the rotary compressor of FIG. It is a longitudinal cross-sectional view of the piston of the rotary compressor of 2nd Embodiment of this invention. It is the top view seen from the discharge port side of the piston of the rotary compressor of 3rd Embodiment of this invention.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. In the following explanation, in describing the configuration shown in the drawings, terms indicating directions such as “up”, “down”, “left”, “right”, and other terms including them are used. However, the purpose of using these terms is to facilitate understanding of the embodiments through the drawings. Therefore, these terms do not necessarily indicate the direction in which the embodiments of the present invention are actually used, and the technical scope of the invention described in the claims is limitedly interpreted by these terms. Should not be done.

(First embodiment)
As shown in FIG. 1, the rotary compressor 100 according to the first embodiment of the present invention is a so-called vertical high-pressure dome type rotary compressor, and includes a hermetic container 1 and a compression unit disposed in the hermetic container 1. A mechanism unit 2 and a motor 3 are provided.

  The compression mechanism unit 2 is disposed in the lower part of the sealed container 1 and is driven by the motor 3 via the shaft 12. The motor 3 is an inner rotor type motor and includes a stator 5 and a rotor 6. The motor 3 is disposed on the upper side of the compression mechanism unit 2. The shaft 12 has a main shaft 25 and an eccentric shaft portion 26 that is eccentric with respect to the main shaft 25.

  A discharge pipe 13 that communicates the inside and the outside of the sealed container 1 is provided on the top of the sealed container 1. A suction pipe 11 connected to the compression mechanism 2 and an accumulator 10 provided outside the rotary compressor 100 is provided below the side of the sealed container 1.

  The accumulator 10 stores refrigerant gas. The refrigerant gas stored in the accumulator 10 is supplied to the compression mechanism unit 2 through the suction pipe 11, compressed by the compression mechanism unit 2, and then discharged into the sealed container 1. The refrigerant gas discharged to the inside of the closed container 1 is discharged to the outside of the closed container 1 through the discharge pipe 13 after cooling the motor 3.

  The refrigerant gas is obtained together with the rotary compressor 100, for example, by controlling a condenser, an expansion mechanism, and an evaporator that constitute an air conditioner (not shown). As the refrigerant gas, for example, carbon dioxide, HC, HFC (such as R410A) or HCFC (such as R22 and R32) is used.

  An oil reservoir 9 in which lubricating oil is stored is formed below the compression mechanism 2 that is a high-pressure region in the sealed container 1. Lubricating oil flows from the oil reservoir 9 through an oil passage (not shown) provided in the shaft 12 to the sliding portion such as the compression mechanism 2 to lubricate the sliding portion. Yes.

  The lubricating oil is, for example, polyalkylene glycol oil (polyethylene glycol, polypropylene glycol, etc.), ether oil, ester oil, mineral oil, and the like.

  The compression mechanism unit 2 is attached to the inner surface of the sealed container 1 and is provided with a cylinder 21 into which refrigerant gas is introduced, an upper end plate member (front head) 50 disposed on the cylinder 21, and a lower part of the cylinder 21. The lower end plate member (rear head) 60 is provided. 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 is attached to one end surface of the cylinder 21 in the axial direction. The upper end plate member 50 includes an annular plate-shaped main body 51 and a cylindrical boss 52 extending upward from the inner peripheral edge of the main body 51. The shaft 12 is inserted through the main body 51 and the boss 52.

  The main body 51 is provided with a discharge port 51 a that communicates with the cylinder chamber 22. A discharge valve 31 is attached to the main body 51 so that the main body 51 is located on the opposite side of the cylinder 21. The discharge valve 31 is a reed valve, for example, 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 bolts 35 or the like. The muffler cover 40 has a boss portion 52 inserted therethrough.

  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 are communicated with each other through a discharge port 51a.

  The muffler cover 40 has a hole 43 that 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 shaft 12 is inserted through the main body portion 61 and the boss portion 62.

  Thus, one end of the main shaft 25 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, and the eccentric shaft portion 26 is disposed inside the cylinder chamber 22.

  Next, the piston 28 will be described with reference to FIGS.

  As shown in FIG. 2, the piston 28 includes an annular roller portion 27 and a blade portion 90 that partitions the cylinder chamber 22 into a low pressure chamber and a high pressure chamber together with the roller portion 27, and revolves inside the cylinder chamber 22. Arranged to be possible. The compression action is performed by the revolving motion of the piston 28.

  The roller portion 27 has a through hole 81 extending in the axial direction of the cylinder 21 at the center thereof. The through hole 81 is provided so that its inner peripheral surface can be fitted to the outer peripheral surface of the eccentric shaft portion 26 of the shaft 12.

  Further, as shown in FIG. 3, an end surface 27 a on the upper end plate member 50 side of the roller portion 27 and an end surface 27 b on the lower end plate member 60 side are respectively provided with an annular ring 82 as an example of an annular member, A protrusion 83 is provided.

  As shown in FIG. 2, the annular ring 82 is rotatably provided on the radially outer side of the end surfaces 27 a and 27 b of the roller portion 27, and is disposed so as to face the end portion on the roller portion 27 side of the blade portion 90. ing. Further, as shown in FIG. 3, the annular ring 82 is arranged so that the inner peripheral surface thereof is in contact with the projection 83 and no step is formed with the end surfaces 27 a and 27 b and the outer peripheral surface of the roller portion 27. ing.

  As shown in FIG. 2, the protruding portion 83 is disposed on the radially inner side of the end surfaces 27 a and 27 b of the roller portion 27. As shown in FIG. 3, the protruding portion 83 is provided integrally with the roller portion 27 so as to protrude from the opening edge of the through hole 81 in the axial direction of the cylinder 21. That is, the protrusion 83 which is a part of the roller portion 27 is provided so as to be interposed between the inner peripheral surface of the annular ring 82 and the outer peripheral surface of the eccentric shaft portion 26.

  Next, the compression action of the cylinder 21 of the compression mechanism 2 will be described with reference to FIG.

  As shown in FIG. 4, the inside of the cylinder chamber 22 of the rotary compressor 100 is partitioned by the blade portion 90 of the piston 28. On the right side (the right side in FIG. 2) of the blade portion 90 of the cylinder chamber 22, the suction pipe 11 is opened on the inner surface to form a suction chamber (low pressure chamber) 22a. On the other hand, on the left side (left side in FIG. 2) of the blade portion 90 of the cylinder chamber 22, a discharge port 51a (shown in FIG. 1) is opened on the inner surface to form a discharge chamber (high pressure chamber) 22b. ing.

  A pair of semi-cylindrical bushes 24, 24 are in close contact with both side surfaces of the blade portion 90 for sealing. The bushes 24 and 24 support the blade portion 90 so as to be able to advance and retract with the blade portion 90 sandwiched from both sides. The blade portion 90 and the bushes 24, 24 are lubricated with lubricating oil. The blade part 90 appears and disappears in a high-pressure back space 110 provided in the cylinder 21 at its tip.

  When the shaft 12 is rotated, the eccentric shaft portion 26 rotates eccentrically with the shaft 12, and the roller portion 27 fitted to the eccentric shaft portion 26 revolves. At this time, the roller portion 27 revolves while its outer peripheral surface is in contact with the inner peripheral surface of the cylinder chamber 22, and the annular rings 82 of the end surfaces 27 a and 27 b of the roller portion 27 are combined with the revolution of the roller portion 27. Rotate.

  As the roller portion 27 revolves in the cylinder chamber 22, the blade portion 90 moves forward and backward with both side surfaces of the blade portion 90 being supported by the bushes 24 and 24. As a result, the low-pressure refrigerant gas is sucked into the suction chamber 22a from the suction pipe 11, compressed in the discharge chamber 22b to be high pressure, and then the high-pressure refrigerant gas is discharged from the discharge port 51a (shown in FIG. 1). .

  The refrigerant gas discharged from the discharge port 51a is discharged to the outside of the muffler cover 40 through the muffler chamber 42 as shown in FIG.

  As described above, according to the rotary compressor 100, the annular ring 82 capable of rotating is provided on the end surface on the end plate members 50 and 60 side of the roller portion 27 that revolves inside the cylinder chamber 22. That is, since the annular ring 82 rotates together with the revolution of the roller portion 27, the relative speed between the contact surfaces of the end plate member 50 (60), the annular ring 82, and the end surface 27a (27b) of the roller portion 27 is Lower. For this reason, the calorific value of the end surfaces 27a and 27b of the roller portion 27 can be suppressed, and seizure of the end surface of the piston 28 can be prevented.

  In addition, as the annular ring 82 rotates, the heat generated on the end faces 27a and 27b of the roller portion 27 is diffused. For this reason, the local temperature rise of the end surface of the piston 28 can be prevented.

  Further, since the annular ring 82 is provided on the outer side in the radial direction of the roller portion 27 having a high peripheral speed and a large amount of heat generation, the effect of suppressing the heat generation amount of the end surface 27 of the roller portion can be enhanced.

  Further, the space between the annular ring 82 and the protruding portion 83 or the blade portion 90 of the roller portion 27 is sealed by the centrifugal force acting on the annular ring 82 due to the revolution of the roller portion 27 and the rotation of the annular ring 82. For this reason, the performance fall of a compressor can be prevented.

  In the rotary compressor 100, the end surface 27a on the upper end plate member 50 side where the discharge port 51a of the roller portion 27 is provided is more easily seized than the end surface 27b on the lower end plate member 60 side. . For this reason, the annular ring 82 should just be provided in the end surface 27a by the side of the end plate member 50 above the roller part 27 at least.

(Second Embodiment)
As shown in FIG. 5, the rotary compressor 200 according to the second embodiment of the present invention includes end surfaces 127 a and 127 b on the end plate members 50 and 60 side of the roller portion 127, and an inner peripheral surface of the eccentric shaft portion 26 of the shaft 12. It differs from the rotary compressor 100 of 1st Embodiment by the point which provided the annular ring 182 which contacts the outer peripheral surface of this.

  In the rotary compressor 200, the eccentric shaft portion 26 includes a cylindrical large-diameter portion 26a and a small-diameter portion 26b provided at both ends in the axial direction of the large-diameter portion 26a and having a smaller diameter than the large-diameter portion 26a. It is configured. The annular ring 182 is provided so that the inner peripheral surface thereof is in contact with the outer peripheral surface of the large-diameter portion 26 a of the eccentric shaft portion 26.

  Thus, the annular ring 182 can be easily rotated by providing the annular ring 182 on the inner side in the radial direction so as to be in contact with the eccentric shaft portion 26.

  In the rotary compressor 200, the outer peripheral surface of the annular ring 182 is provided so that the roller portion 27 of the blade portion 90 is in contact with the end portion of the blade, but the present invention is not limited thereto. For example, a protrusion formed integrally with the roller portion may be provided on the outer side in the radial direction of the annular ring so that the outer peripheral surface of the annular ring does not contact the end of the blade portion on the roller portion side.

(Third embodiment)
As shown in FIG. 6, the rotary compressor 300 according to the third embodiment of the present invention is the first embodiment in that a blade portion 190 is provided with a storage portion 191, a communication portion 193, and a seal member 194. The rotary compressor 100 of FIG.

  The storage portion 191 has an opening 192 at the end on the roller portion 27 side, and is connected to the opening 192. The communication part 193 connects the storage part 191 and the back space 110 outside the cylinder chamber 22. The seal member 194 is housed in the housing portion 191 so that the end on the annular ring 82 side can protrude from the opening 192.

  In the rotary compressor 300, since the storage portion 191 communicates with the high-pressure back space 110, the seal member 194 is always pressed toward the annular ring 82. For this reason, the space between the blade part 190 and the roller part 27 is sealed by the seal member 194, and the performance degradation of the compressor can be prevented.

(Other embodiments)
The present invention is not limited to the rotary compressors 100, 200, and 300, and can be applied to a rotary compressor having another configuration such as a rotary compressor in which the lower end plate member is omitted.

  The components described in the above embodiments may be combined as appropriate, and may be selected, replaced, or deleted as appropriate.

DESCRIPTION OF SYMBOLS 1 Airtight container 2 Compression mechanism part 3 Motor 5 Stator 6 Rotor 9 Oil sump part 10 Accumulator 11 Suction pipe 12 Shaft 13 Discharge pipe 21 Cylinder 22 Cylinder chamber 22a Suction chamber 22b Discharge chamber 24 Bush 25 Main shaft 26 Eccentric shaft part 26a Large diameter part 26b Small-diameter portion 27 Roller portions 27a, 127a End surfaces 27b, 127b on the upper end plate member side End surfaces 28 on the lower end plate member side Piston 31 Discharge valve 35 Bolt 40 Muffler cover 42 Muffler chamber 43 Hole portion 50 End plate member 51 Body portion 51a Discharge port 52 Boss portion 60 End plate member 61 Body portion 62 Boss portion 81 Through hole 82, 182 Annular ring 83 Projection portion 90, 190 Blade portion 191 Storage portion 192 Opening portion 193 Communication portion 194 Seal members 100, 200, 300 Rotary compressor 110 Back space

Claims (5)

A cylinder (21) having a cylinder chamber (22) therein;
A shaft (12) having a main shaft (25) and an eccentric shaft portion (26) eccentric to the main shaft (25) and having the eccentric shaft portion (26) disposed in the cylinder chamber (22). )When,
An end plate member (50) disposed at one end of the cylinder (21) in the axial direction and provided with a discharge port (51a);
An annular roller portion (27) whose inner peripheral surface is fitted to the outer peripheral surface of the eccentric shaft portion (26) and revolves inside the cylinder chamber (22);
A blade portion (90) for partitioning the cylinder chamber (22) into a low pressure chamber and a high pressure chamber together with the roller portion (27);
With
A rotary compressor characterized in that an annular member (82) capable of rotating is provided at least on an end surface of the roller portion (27) on the end plate member (50) side. The rotary compressor according to claim 1.
The rotary compressor characterized in that the annular member (82) is provided on the outer side in the radial direction of the roller portion (27). The rotary compressor according to claim 1 or 2,
A rotary compressor characterized in that a part of the roller portion (27, 83) is interposed between an inner peripheral surface of the annular member (82) and an outer peripheral surface of the eccentric shaft portion (26). The rotary compressor according to claim 1 or 2,
The rotary compressor characterized in that the annular member (182) is provided inside the roller portion (27) in the radial direction. In the rotary compressor according to any one of claims 1 to 3,
The annular member (82) is arranged so that the outer peripheral surface faces the end of the blade part (90) on the roller part (27) side,
The blade part (190) has an opening part (192) at the end part on the roller part (27) side and a storage part (191) connected to the opening part (192), and the storage part (191). And the communication part (193) connecting the cylinder chamber (22) to the outside (110) and the storage part (191), the end on the annular member (82) side can protrude from the opening (192). And a sealing member (194) housed in the rotary compressor.

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