JP2015148199A - Hermetic type compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a hermetic type compressor in which low costs, high reliability, and compression efficiency improvement are achieved.SOLUTION: A hermetic type compressor includes: a cylindrical closed container 1; and a compression mechanism part 3 stored in the closed container 1, the compression mechanism part 3 where a contact support part 17 which contacts with an inner peripheral surface of the closed container 1 is formed on an outer peripheral surface. A groove part 16 is formed along an axial direction of the closed container 1 on the outer peripheral surface of the compression mechanism part 3. The compression mechanism part 3 and the closed container 1 are welded at the contact support part 17 facing the groove part 16.

Description

  The present invention relates to a hermetic compressor.

  As a conventional hermetic compressor, one having an electric motor unit and a compression mechanism unit driven by the electric motor unit inside the hermetic container is known. The compression mechanism portion includes a crankshaft having an eccentric shaft portion for transmitting the rotational force of the electric motor portion to the compression mechanism portion, a piston that is rotatably fitted to the eccentric shaft portion, and a cylindrical air chamber , A vane that is slidably fitted in a vane groove provided in the cylinder, and an upper bearing and a lower bearing that are installed at both ends of the cylinder in the axial direction.

  In the conventional hermetic compressor configured as described above, stress is generated in the cylinder in order to weld and fix the hermetic container and the compression mechanism. For example, the stress applied to the cylinder by performing welding and fixing includes the thermal stress caused by a thermal change applied from the welding location to the inside of the cylinder, and the stress caused by the cylinder being pressed against the sealed container at the opposite surface of the welding location during welding. , Stress generated by cooling the welded part after welding and shrinking the sealed container in the direction of the welded part, and the like.

  Since these stresses acting on the cylinder are concentrated in the vane groove formed asymmetrically with respect to the cylindrical cylinder, conventionally, the vane groove may be deformed. For this reason, conventionally, the slidability between the vane and the vane groove is deteriorated, the compression performance is lowered, and the vane may be worn / damaged.

  With respect to this problem, for example, in Patent Document 1 shown below, the cylinder is welded and fixed to the sealed container with three welding fixing portions, and two welding fixing portions sandwiching the vane groove among the positions to be fixed by welding. And a groove in the radial direction, respectively. In the prior art disclosed in Patent Document 1, by forming a groove in the radial direction in the cylinder, it is difficult to transmit the thermal stress generated during welding fixation to the vane groove, and deformation of the vane groove is suppressed.

  Further, in Patent Document 2 shown below, the bracket is screwed to the cylinder and the bracket and the sealed container are fixed by welding so that the deformation generated in the bracket during welding is not directly transmitted to the cylinder. Deformation was suppressed. Moreover, in the prior art described in Patent Document 2, a notch is provided in the vicinity of the welded bracket so that it is difficult to transmit thermal stress to the cylinder.

Japanese Patent Laid-Open No. 11-324958 (5th page, FIG. 6) Japanese Patent Laid-Open No. 9-32731 (page 4, FIGS. 1 and 2)

  However, in the prior art shown in Patent Document 1, only the thermal stress generated at the time of welding fixation is made difficult to be transmitted to the vane groove, and the stress generated when the cylinder is pressed against the sealed container at the opposite surface of the welded part at the time of welding. And, it is difficult to suppress the stress caused by the welded portion being cooled after welding and the closed container contracting in the direction of the welded portion. For this reason, in the prior art which concerns on patent document 1, there existed a possibility that a vane groove | channel might still deform | transform.

  In the prior art disclosed in Patent Document 2, the bracket is screwed to the cylinder and the bracket and the sealed container are fixed by welding so that the deformation generated in the bracket is not directly transmitted to the cylinder. The addition has a problem that directly leads to an increase in cost and weight.

  The present invention has been made to solve the above-described problems, and the object thereof is to achieve cost reduction, high reliability, and improvement in compression efficiency by suppressing the deformation of the vane groove with a simple configuration. To obtain a closed compressor.

  A hermetic compressor according to the present invention includes a cylindrical hermetic container, a compression mechanism unit that is accommodated in the hermetic container, and a contact support part that abuts on the inner peripheral surface of the hermetic container is formed on the outer peripheral surface; A groove portion is formed along an axial direction of the sealed container on an outer peripheral surface of the compression mechanism portion, and the compression mechanism portion and the sealed container are in contact with and support the groove portion. It is characterized by being welded at the part.

  According to the present invention, it is possible to obtain a hermetic compressor in which cost reduction, high reliability, and improvement in compression efficiency are achieved.

It is the schematic which shows schematically the longitudinal cross-section of the hermetic compressor which concerns on Embodiment 1 of this invention. It is a cross-sectional view which shows the welding fixing | fixed part of the airtight container and compression mechanism part shown in FIG. It is an enlarged view of the groove part shown in FIG.

  Embodiments of the present invention will be described below with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals, and the description thereof is omitted or simplified as appropriate.

Embodiment 1 FIG.
1 is a schematic diagram schematically showing a longitudinal section of a hermetic compressor 100 according to Embodiment 1 of the present invention. FIG. 2 is a cross-sectional view showing the weld fixing portion 15 between the sealed container 1 and the compression mechanism portion 3 shown in FIG. As shown in FIG. 1, an electric motor unit 2 and a compression mechanism unit 3 are accommodated in the sealed container 1. The electric motor unit 2 transmits driving force to the compression mechanism unit 3 via the main shaft 4. In the following description, the axial direction (vertical direction in the figure) of the cylindrical sealed container 1 is simply referred to as the axial direction, and the direction passing through the central axis of the sealed container 1 and intersecting the central axis is simply the radial direction. That's it.

  The compression mechanism portion 3 includes an eccentric shaft portion 5, a cylinder 6, an upper bearing 7, a lower bearing 8, and a piston 9. The eccentric shaft portion 5 is attached to the main shaft 4, and the driving force from the compression mechanism portion 3 is transmitted to the eccentric shaft portion 5. An upper bearing 7 and a lower bearing 8 are attached to both ends of the cylinder 6 in the axial direction. The cylinder 6, the upper bearing 7, and the lower bearing 8 form a compression chamber 13 shown in FIG. In the compression chamber 13, an eccentric shaft portion 5 attached to the main shaft 4, a piston 9 attached to the eccentric shaft portion 5, and a vane 11 are disposed.

  A radial vane groove 10 is formed in the cylinder 6. The vane groove 10 holds the vane 11 slidably in the radial direction. On the back side of the vane 11, a spring member 12 is installed between the vane 11 and the sealed container 1. The vane 11 is pressed against the piston 9 by the spring member 12.

  The cylinder 6 is formed with a suction port 14 in the radial direction. The refrigerant sucked from the suction muffler 50 shown in FIG. 1 is guided into the compression chamber 13 from the suction port 14 shown in FIG. The upper bearing 7 and the lower bearing 8 shown in FIG. 1 have discharge ports (not shown), and the refrigerant compressed in the compression chamber 13 is discharged from the discharge ports. The discharge port is formed to communicate with the compression chamber 13 on the side opposite to the suction port 14 shown in FIG. The cylinder 6 is formed with, for example, a plurality of through holes 18 and a plurality of screw holes 19 that form a coolant channel along the axial direction.

  Next, the operation of the hermetic compressor 100 configured as described above will be described. A rotational force is transmitted to the main shaft 4 by driving the electric motor unit 2. The rotational force transmitted to the main shaft 4 is transmitted to the eccentric shaft portion 5 attached to the main shaft 4, and the piston 9 attached to the eccentric shaft portion 5 rotates (rotates) in the compression chamber 13.

  When the piston 9 rotates in the compression chamber 13, a low-pressure refrigerant is supplied from the suction port 14 into the compression chamber 13. Furthermore, when the piston 9 rotates, the volume of the compression chamber 13 is reduced and the refrigerant is compressed. The compressed refrigerant is discharged into the sealed container 1 from discharge ports formed in the upper bearing 7 and the lower bearing 8. At this time, the vane 11 is pressed against the piston 9 by the high-pressure refrigerant discharged into the spring member 12 and the sealed container 1, and slides in the vane groove 10 in the radial direction in conjunction with the movement of the piston 9. To do. The vane 11 operates in this manner and functions to partition the suction side and the discharge side of the cylinder 6.

  Next, welding fixation between the sealed container 1 and the compression mechanism unit 3 will be specifically described with reference to FIG. In this embodiment, an example in which the cylinder 6 and the sealed container 1 are welded will be described.

  The cylinder 6 is accommodated in a cylindrical sealed container 1. The cylinder 6 has a substantially cylindrical shape, and an outer peripheral surface thereof is in contact with an inner peripheral surface of the sealed container 1. The outer peripheral surface of the cylinder 6 that contacts the inner peripheral surface of the sealed container 1 constitutes an abutting support portion 17.

  Three grooves 16 are formed on the outer peripheral surface of the cylinder 6 along the circumferential direction. Each groove portion 16 is formed along the axial direction of the sealed container 1 so that the sealed container 1 and the cylinder 6 do not contact each other. Each groove portion 16 extends in the axial direction so as to communicate with the upper surface and the lower surface of the cylinder 6, and by forming the three groove portions 16, three contact support portions 17 along the circumferential direction are formed. Each groove portion 16 is not in contact with the sealed container 1 and is positioned between the adjacent contact support portions 17. Note that the circumferential length L of each groove portion 16 is preferably 1 to 20% of the circumference of the cylinder 6.

  The cylinder 6 and the sealed container 1 are welded and fixed by the welding fixing part 15 of the contact support part 17 facing the groove part 16. That is, the cylinder 6 and the hermetic container 1 are welded and fixed by the contact support part 17 on the opposite side to the groove part 16 with the central axis of the hermetic container 1 and the compression chamber 13 interposed therebetween. That is, in this embodiment, the groove 16 is formed on the outer peripheral surface of the cylinder 6 on one side with the central axis of the sealed container 1 and the compression chamber 13 interposed therebetween, and the cylinder 6 and the sealed container 1 are connected on the other side. It is fixed by welding. In addition, welding with the cylinder 6 and the airtight container 1 is performed by arc welding, such as arc spot welding, for example.

  The number of the weld fixing parts 15 between the cylinder 6 and the sealed container 1 is preferably equal to the number of the groove parts 16. In this embodiment, since the three groove portions 16 are formed, there are three welding fixing portions 15. Preferably, the weld fixing portion 15 is in the range of 140 to 220 degrees around the central axis of the sealed container 1 from the groove portion 16 facing the weld fixing portion 15.

  FIG. 3 is an enlarged view of the groove 16 shown in FIG. When welding is performed at the weld fixing portion 15, a radial stress 20 is generated at the facing position. The stress 20 is a radial stress 20 generated by a reaction from the sealed container 1 when the cylinder 6 is pressed against the sealed container 1 during welding. Alternatively, the stress 20 is the radial stress 20 generated when the welding fixing portion 15 is cooled and the sealed container 1 contracts after the welding, and the sealed container 1 presses the cylinder 6.

  In this embodiment, as shown in FIG. 2, a groove 16 is formed at a position facing the weld fixing portion 15. That is, the groove portion 16 is disposed on the opposite side of the cylinder 6 along the radial direction of the weld fixing portion 15. For this reason, as shown in FIG. 3, the stress 20 acts on a position corresponding to the groove 16. Since the groove portion 16 is formed asymmetrically with respect to the outer peripheral shape of the cylinder 6, the radial stress 20 concentrates on the groove portion 16. Specifically, the radial stress 20 acts on the groove 16 of the cylinder 6 as the stress 21. Therefore, even if a large stress 20 is generated, only the end of the groove 16 is slightly deformed, and the stress 20 is dispersed. As a result, in this embodiment, deformation inside the cylinder 6 is suppressed.

  As described above, in this embodiment, since the deformation of the vane groove 10 formed in the cylinder 6 can be suppressed, the clearance between the vane groove 10 and the vane 11 can be reduced. Therefore, in this embodiment, the leakage loss of the compression process can be reduced and the efficiency of the compressor can be improved. As a result, in this embodiment, energy saving of the compressor and the air conditioner including the compressor can be achieved.

  Preferably, the weld fixing part 15 is in the range of 140 to 220 degrees around the central axis of the sealed container 1 from the groove part 16 facing the weld fixing part 15. Thus, by arranging the welding fixing portion 15, the radial stress 20 generated during welding can be suitably applied to the groove portion 16.

  Preferably, the circumferential length L of the groove 16 is 1 to 20% of the circumference of the cylinder 6. By forming the groove portion 16 in this way, the radial stress 20 generated during welding is suitably applied to the groove portion 16 while ensuring the frictional force between the contact support portion 17 and the sealed container 1. be able to.

  As described above, in this embodiment, the cylinder 6 and the sealed container 1 are welded at a position facing the groove 16. As a result, in this embodiment, since the radial stress 20 generated at the time of welding is concentrated in the groove portion 16, no stress is directly applied to the cylinder 6. Therefore, in this embodiment, deformation of the vane groove 10 formed in the cylinder 6 is suppressed with a simple configuration, and the hermetic compressor 100 in which cost reduction, high reliability, and improvement in compression efficiency are achieved is provided. can get.

  The present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the present invention. That is, the configuration of the above embodiment may be improved as appropriate, or at least a part of the configuration may be replaced with another configuration. Further, the configuration requirements that are not particularly limited with respect to the arrangement are not limited to the arrangement disclosed in the embodiment, and can be arranged at a position where the function can be achieved.

  For example, in the above embodiment, the example in which the three groove portions 16 are formed has been described. However, the number of the groove portions 16 can be changed as appropriate.

  For example, in the above embodiment, the example in which the cylinder 6 and the sealed container 1 are welded has been described. However, when the sealed container 1 is welded to another configuration such as the upper bearing 7 or the lower bearing 8. Can be applied. That is, a groove portion and a contact support portion may be provided in another configuration such as the upper bearing 7 or the lower bearing 8, and welding to the sealed container 1 may be performed at a position facing the groove portion. Also in this case, since the stress in the radial direction generated at the time of welding is concentrated on the groove portion, it is possible to suppress the stress from directly acting on the component member in which the groove portion is formed.

  DESCRIPTION OF SYMBOLS 1 Airtight container, 2 Electric motor part, 3 Compression mechanism part, 4 Main shaft, 5 Eccentric shaft part, 6 Cylinder, 7 Upper bearing, 8 Lower bearing, 9 Piston, 10 Vane groove, 11 Vane, 12 Spring member, 13 Compression chamber, 14 suction port, 15 weld fixing part, 16 groove part, 17 contact support part, 18 through hole, 19 screw hole, 20 stress, 21 stress, 50 suction muffler, 100 hermetic compressor.

Claims (7)

A cylindrical sealed container;
A compression mechanism portion that is accommodated in the sealed container and has a contact support portion that is in contact with an inner peripheral surface of the sealed container formed on an outer peripheral surface;
A groove portion is formed on the outer peripheral surface of the compression mechanism portion along the axial direction of the sealed container,
The hermetic compressor, wherein the compression mechanism and the sealed container are welded at the abutting support that faces the groove.   2. The sealing according to claim 1, wherein a plurality of the groove portions are formed on the outer peripheral surface of the compression mechanism portion so that the plurality of contact support portions are formed along a circumferential direction thereof. Mold compressor.   The hermetic compressor according to claim 2, wherein each of the plurality of groove portions is formed between the adjacent contact support portions.   4. The hermetic compressor according to claim 2, wherein the compression mechanism and the sealed container are welded at the abutting support that faces each of the plurality of grooves. 5. .   5. The hermetic compressor according to claim 1, wherein the number of the groove portions and the number of welding fixing portions between the compression mechanism portion and the hermetic container are equal.   The welding fixing part between the compression mechanism part and the sealed container is in the range of 140 to 220 degrees from the groove part around the central axis of the sealed container. The hermetic compressor according to claim 1.   The groove is formed in a length of 1 to 20% of the circumference of the compression mechanism portion along the circumferential direction of the compression mechanism portion. The hermetic compressor according to item.

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