KR101557506B1 - compressor - Google Patents

Abstract

The present invention relates to a compressor that compresses a refrigerant while rotating in a state in which a rotating member is suspended from a stationary member. More particularly, the present invention relates to a compressor that is installed to suspend a rotating member from a first stationary member, And the oil stored in the sealed container is supplied to the lubrication passage provided between the stationary member and the rotary member, so that the friction loss between the components can be reduced. It is possible to secure reliability of operation.

Compressor, fixing member, rotary member, fixed shaft, eccentric portion, cylinder, rotor, roller, vane, upper bearing, lower bearing

Description

COMPRESSOR

The present invention relates to a compressor that compresses a refrigerant while rotating while a rotary member is suspended from a fixed member while being supported on a bearing. In particular, the present invention can improve not only structural stability but also assemblability, And more particularly, to a compressor capable of ensuring reliability.

2. Description of the Related Art Generally, a compressor is a mechanical device that receives power from an electric motor or a power generating device such as a turbine to compress air, refrigerant or various other operating gases to increase the pressure. Or widely used throughout the industry.

Such a compressor is broadly classified into a reciprocating compressor that compresses the refrigerant while linearly reciprocating the piston inside the cylinder so as to form a compression space in which a working gas is sucked and discharged between the piston and the cylinder. A rotary compressor for compressing the working gas in a compression space formed between a roller and a cylinder to be eccentrically rotated and a rotary compressor for compressing the working gas in a compression space formed between a roller and a cylinder, And a scroll compressor that compresses the refrigerant while rotating the orbiting scroll along the fixed scroll so that a compression space in which the working gas is sucked and discharged is formed in the scroll compressor.

Reciprocating compressors have excellent mechanical efficiency, but these reciprocating movements cause severe vibration and noise problems. Because of this problem, rotary compressors have been developed due to their compactness and excellent vibration characteristics.

The rotary compressor is configured such that a motor portion and a compression mechanism portion are mounted on a drive shaft in a hermetically sealed container. The roller located around the eccentric portion of the drive shaft is located in a cylinder forming a cylindrical compression space, And extends between the compression spaces to divide the compression space into a suction region and a compression region, and the roller is positioned eccentrically in the compression space. Generally, the vane is configured to be supported by a spring on the recessed portion of the cylinder so as to press the surface of the roller, and by this vane, the compression space is divided into the suction region and the compression region as described above. The suction region gradually increases in accordance with the rotation of the drive shaft, so that the refrigerant or the working fluid is sucked into the suction region and the compressed region is gradually reduced, thereby compressing the refrigerant or the working fluid therein.

In such a conventional rotary compressor, since the motor portion and the compression mechanism portion are stacked vertically, there is a problem that the height of the compressor inevitably increases as a whole. In addition, in the conventional rotary compressor, since the weight of the motor portion and the compression mechanism portion are different from each other, a difference in inertial force is generated, and inevitably unbalance occurs on the upper and lower sides around the drive shaft. Therefore, in order to compensate for the unbalance between the motor unit and the compression mechanism unit, a weight member can be added to the weight member having a relatively small weight. However, this results in an additional load applied to the rotating member, . In addition, in the conventional rotary compressor, since the eccentric portion is formed in the drive shaft in the compression mechanism, the eccentric portion is rotated together with the rotation of the drive shaft to drive the roller outside the eccentric portion. As a result, in the eccentric rotation of the drive shaft and eccentric portion There is a problem that the vibration due to the vibration is inevitably generated. Further, in the conventional rotary compressor, the eccentric portion of the drive shaft rotates continuously and slidingly contacts the inner surface of a stationary cylinder to which the roller is fixed, and also continuously slides on the end surface of the vane, Since there is a high relative speed between the sliding contact elements, friction loss is generated. This leads to a reduction in the efficiency of the compressor. Furthermore, there is a possibility that the refrigerant leaks from the contact surface between the sliding contact vane and the roller So that the mechanical reliability is lowered.

The conventional rotary compressor has a configuration in which a drive shaft rotates inside a fixed cylinder, while in Japanese Unexamined Patent Publication Nos. 62-284985 and 64-100291, a shaft having an intake port in the axial direction and a shaft larger than the shaft A fixed shaft integrally formed with a piston eccentric in diameter and having a port communicating with a suction port of the shaft in a radial direction; A vane that is installed so as to be able to be run; A rotor rotatable about said vane; An upper bearing having a discharge port; Lower bearing; A permanent magnet having a hollow cylindrical shape having a height greater than a difference between an outer diameter and an inner diameter, the permanent magnet being fixed to the lower bearing; And a coil that is not rotated on the outer periphery of the permanent magnet. By configuring the upper and lower rotors so as to be rotatable by sequentially connecting the rotor and the lower bearing, the space between the rotor, the upper bearing and the lower bearing, And a rotary compressor.

In the rotary compressor disclosed in Japanese Unexamined Patent Publication (KOKAI), since the hollow cylindrical permanent magnet is located inside the stator, and the rotor and the compression mechanism section including the vane are located inside the permanent magnet, the motor section and the compression mechanism section It is possible to solve the problem that occurs.

However, since the rotary compressor disclosed in the above Japanese Patent Laid-open Publication No. Hei 10-24185 is resiliently supported by the rotor in which the vane rotates, and is in sliding contact with the outer surface of the eccentric portion (piston portion) There is still a problem that there is a possibility of refrigerant leakage at the contact surface between the vane and the eccentric portion which is in sliding contact as well as friction loss due to the existence of a high relative speed difference as in the rotary compressor. In addition, the rotary compressor disclosed in the above Japanese Laid-Open Patent Publications does not disclose any realizable structure for the suction and discharge flow of the operating fluid, the lubrication oil supply in the compression mechanism portion, and the mounting of the bearing member. It is not reaching to the extent possible.

Alternatively, U.S. Patent Publication No. 7,217,110 discloses a rotary compressor in which a fixed shaft and an eccentric portion are integrally formed, and a compression space is formed between an outer surface of a roller rotatably positioned in an eccentric portion and an inner surface of a rotating rotor . Here, the rotational force of the rotor is transmitted to the roller through a vane fixed to the upper and lower plates of the rotor rotating integrally with the rotor. By using the pressure inside the sealed container and the pressure difference inside the compression space, And the working fluid and the lubricating oil are introduced into the compression space through the formed longitudinal flow passage.

Therefore, the rotary compressor disclosed in the above-mentioned U.S. Patent Application Publication No. 2000-227558 also can solve the problems due to the fact that the motor unit and the compression mechanism unit are installed in the height direction in the conventional rotary compressor because the compression mechanism is formed inside the rotor. Further, unlike the Japanese Laid-Open Patent Publications, there is no difference in relative speed between the rotors, the vanes and the rollers because they rotate integrally, and there is no fear of frictional loss caused thereby.

However, since the one end of the fixed shaft is fixed to the hermetically sealed container, the other end of the fixed shaft is formed to be suspended from the hermetically sealed container while being separated from the hermetically sealed container, so that the center of the fixed shaft is assembled And is very vulnerable to lateral vibration due to inevitable eccentric rotation due to the nature of the rotary compressor. Thus, there is a problem in that it is difficult to actually manufacture the compressor and the assembling productivity is poor. In addition, since the vane is formed inwardly from the rotor and the vane groove is formed in the roller so as to guide the movement locus of the vane, the volume of the roller inevitably becomes large for forming the vane groove and a roller of a relatively large volume There is a problem that oscillation in the lateral direction is excited by eccentric rotation. However, in the case of a structure using lubricating oil, it is necessary to use lubricating oil in the inside of the sealed container and the pressure difference in the compression space, In this case, not only a lot of lubricating oil is inevitably incorporated in the working fluid but also the lubricating performance is deteriorated because the compressor can be escaped with the working fluid, because the lubricating oil is drawn into the compression space and circulated together with the working fluid.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a compressor which can easily assemble components to a hermetically sealed container and improve structural safety.

It is another object of the present invention to provide a compressor that not only reduces lateral vibration due to eccentric rotation but also facilitates actual production and assembly.

It is also an object of the present invention to provide a compressor in which oil stored in a hermetically sealed container can be supplied to a lubrication passage between a stationary member and a rotary member.

According to an aspect of the present invention, there is provided a compressor including: a sealed container in which oil is stored; A stator fixed in the hermetically sealed container; A first fixing member including a fixed shaft provided with an upper end thereof so as not to move in the sealed container and extending to the inside of the sealed container, and an eccentric portion formed to be eccentric to the fixed shaft; A second fixing member formed to be spaced apart from a lower end of the first fixing member and installed so as not to move in a lower portion of the closed container; A cylindrical rotor rotatable about a fixed axis by a rotating electromagnetic field from the stator, a rotating shaft rotatable about the eccentric portion while rotating together with the cylindrical rotor, and a compression space formed between the cylindrical rotor and the cylindrical rotor And a vane for transmitting rotational force from the cylindrical rotor to the roller and dividing the compression space into a suction pocket for sucking the refrigerant and a compression pocket for compressing and discharging the refrigerant, and is rotatable while applying a load to the second fixing member A rotating member supported by the rotating member; And a lubricating oil guiding the oil stored in the hermetically sealed container to a portion where the rotary member and the fixing member are bearing using the rotational force of the rotary member.

In addition, in the present invention, the rotating member further includes upper and lower bearing covers that form upper and lower portions of the compression space and rotate about the fixed shaft together with the cylindrical rotor, and the lower bearing cover includes a lower shaft cover And a lower cover portion coupled with the cylinder to form a lower portion of the compression space.

Further, in the present invention, the lower shaft portion is formed to extend from the lower end of the fixed shaft, and the end portion of the lower shaft portion is rotatably supported while applying a load of the rotary member to the second fixing member.

According to the present invention, the second fixing member includes a cylindrical bearing portion having a stepped portion inside, the lower end portion of the lower shaft portion is supported by the step difference of the second fixing member, and the outer surface of the lower shaft portion is journaled on the inner surface of the cylindrical bearing portion. .

Further, in the present invention, the lowermost end of the lower shaft portion is installed so as to be immersed in the oil stored in the hermetically sealed container, and the lubricating oil includes a groove formed in the lower shaft portion on the outer circumferential surface of the fixed shaft and on the inner circumferential surface bearing the bearing.

Further, in the present invention, it is characterized by further comprising an oil supply member mounted on a lower portion of the rotating member and pumping the oil into the lubricating oil as the rotating member is rotated.

In addition, in the present invention, the rotating member further includes upper and lower bearing covers that form upper and lower portions of the compression space and rotate about the fixed shaft together with the cylindrical rotor, and the lower bearing cover includes a lower shaft cover And a lower cover portion coupled with the cylinder to form a lower portion of the compression space. The oil supply member includes a hollow shaft portion press-fitted into the lower shaft portion, and a hollow shaft portion fixed to the inside of the hollow shaft portion to spiral up the oil in accordance with rotation of the lower shaft portion. And a propeller.

Further, in the present invention, the eccentric portion is characterized by protruding in all the radial directions of the fixed shaft.

Further, in the present invention, the cylindrical rotor further includes upper and lower bearing covers which form upper and lower portions of the compression space and rotate about the fixed shaft together with the cylindrical rotor, and the lower bearing cover includes a lower portion And a lower cover portion coupled to the cylinder to form a lower portion of the compression space, wherein the lubricating oil passage includes a first oil supply passage formed axially below the fixed shaft, and a second oil supply passage communicated with the first oil supply passage and the eccentric portion And a second oil supply passage formed in the eccentric portion.

Further, in the present invention, it is preferable that the compressor further includes a refrigerant suction passage which is connected to the suction pocket of the compression space through the fixed shaft and the eccentric portion, and the second oil supply passage extends to the upper portion of the eccentric portion by bypassing the refrigerant suction passage do.

Further, in the present invention, an upper groove portion is formed on the upper surface of the eccentric portion, and the upper groove portion functions as a oil storage groove for lubrication of the thrust surface between the rotary member and the eccentric portion upper surface.

Further, in the present invention, the lower groove portion is formed on the bottom surface of the eccentric portion, and the lower groove portion functions as a storage groove for lubricating the thrust surface between the rotary member and the eccentric portion bottom surface, And an oil supply hole communicating with the lower groove in the radial direction of the lower portion of the fixed shaft so as to communicate with the lower groove.

In the present invention, the lubricating oil further includes an oil storage groove provided at a portion where the eccentric portion, the fixed shaft, and the upper bearing cover are in contact with each other so as to communicate with the second oil supply passage.

Further, in the present invention, the upper bearing cover may include an upper shaft portion that partially surrounds the upper end of the fixed shaft, and the lubricant may include a groove provided in the inner peripheral surface of the shaft portion of the upper bearing cover to communicate with the oil reservoir.

The compressor according to the present invention configured as described above is assembled so that the rotary member is suspended from the fixing member, then the fixing member is fixed to the upper bearing and the rotary member is rotatably supported on the lower bearing, and the upper and lower bearings are sealed Since the components are fixed to the container, the components can be easily assembled to the airtight container so that the structural safety and assemblability can be improved.

In the compressor according to the present invention, even when the eccentric portion is eccentric from the axial center of the fixed shaft, the compressor rotates about the fixed shaft while the cylindrical rotor rotates about the eccentric portion The eccentric rotation is not generated because the cylindrical rotor and the roller rotate around the respective axes. As a result, in order to reduce the lateral vibration due to the eccentric rotation and to reduce the vibration due to the eccentric rotation, It is possible to omit it, and the efficiency can be increased.

Further, the compressor according to the present invention lubricates the surface where the lower bearing cover and the fixing member of the rotating member abut against each other while supplying oil stored in the sealed container through the communicated flow path, And the upper bearing cover and the fixing member of the rotary member are lubricated by the oil supply member so that the oil can be supplied to the parts positioned above the oil level by a predetermined height or higher. It is possible to improve the compression efficiency as well as to improve the reliability of operation.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 to 3 are a side sectional perspective view and an exploded perspective view and a side sectional view showing an example of a compressor according to the present invention.

1 to 3, the compressor according to the present invention includes a sealing device 110, a stator 120 fixed in the sealed container 110, a rotating electromagnetic field from the stator 120, A rotary member 130 installed to be rotatable inside the stator 120 to compress the refrigerant and a rotary member 130 installed to hang on the outer circumferential surface and the upper and lower ends of the fixed shaft 141 are moved An upper bearing 150 for fixing the upper end of the fixing shaft 141 to the inside of the hermetically sealed container 110 and an upper bearing 150 which is separated from the lower end of the fixing shaft 141, And a lower bearing 160 fixed to the inside of the hermetically sealed container 110 so as to be rotatably supported on the upper surface. Here, the transmission mechanism for providing the power through the electric action includes the rotor 131 of the rotary member 130 including the stator 120, and the compression mechanism for compressing the refrigerant through the mechanical action includes the rotary member 130 (Not shown). Therefore, by providing the transmission mechanism and the compression mechanism in the radial direction, the overall compressor height can be reduced.

The hermetically sealed container 110 includes a cylindrical body 111 and upper and lower shells 112 and 113 coupled to the upper and lower portions of the body 111. A rotary member 130 and a fixing member 140 ) Can be stored up to an appropriate height. In the embodiment of the present invention, the upper shell 112 is provided with a high pressure type. In the center of the upper shell 112, for example, a suction shaft (not shown) through which the refrigerant is sucked is directly exposed to the fixing shaft 141, And a discharge pipe (114) through which refrigerant can be discharged is provided at a predetermined position. Of course, depending on whether the inside of the closed container 110 is filled with the compressed refrigerant or filled with the refrigerant before being compressed, the high pressure type or the low pressure type is determined, so that the suction pipe and the discharge pipe may be changed. In the embodiment of the present invention, the fixed shaft 141, which is a high-pressure type suction pipe, protrudes outside the hermetically sealed container 110. However, it is not necessary that the fixed shaft 141 is excessively protruded to the outside of the hermetic container 110, and it is preferable that an appropriate fixing structure is provided outside the hermetic container 110 so as to be connected to the external refrigerant pipe. In addition, the upper shell 112 is provided with a terminal 115 for supplying power to the stator 120.

The stator 120 is composed of a core and a coil that is concentratedly wound around the core, and is fixed to the inside of the body 111 of the closed container 110 by heat shrinkage. The core employed in the conventional BLDC motor has nine slots along the circumference whereas in the preferred embodiment of the present invention the diameter of the stator 120 is relatively large such that the core of the BLDC motor has twelve slots along the circumference . As the number of slots of the core increases, the number of windings of the coil increases. Therefore, in order to generate the electromagnetic force of the conventional stator 120, the height of the core may be reduced.

The rotating member 130 includes cylindrical rotors 131 and 132, a roller 133, a vane 134, a bush 135, an upper bearing cover 136 and a muffler 137, a lower bearing cover 138 ). The cylindrical rotors 131 and 132 include a rotor 131 having a plurality of permanent magnets in the axial direction so as to rotate by a rotating electromagnetic field from the stator 220 and a rotor 131 located inside the rotor 131, The rotor 131 and the cylinder 132 may be formed separately and formed into a single body in the form of a laminate in which a powder sintered body or a steel piece is laminated, . The roller 133 is rotatably mounted in a cylindrical shape on the outer circumferential surface of the eccentric portion 142 of the fixing member 140 to be described later so that a lubricant structure is applied between the roller 133 and the eccentric portion 142 . At this time, between the roller 133 and the eccentric portion 142, there are suction guide passages 133A and 142C through which the refrigerant can be sucked, and the roller 133 is provided with suction holes (not shown) communicating with the suction guide passages 133A and 142C 133a. The vane 134 is integrally provided on the outer circumferential surface of the roller 133 so as to be positioned at one side of the suction port 133a of the roller 133 and is integrally provided on the inner circumferential surface of the cylindrical rotor 131 or 132 or the cylinder 132 And is fitted to the vane mount 132H. The bush 135 is installed to support both sides of the end of the vane 134 fitted in the vane mount 132H of the cylindrical rotors 131 and 132. Of course, a lubrication structure is applied so that the vane 134 smoothly moves between the vane mount 132H and the bush 135 of the cylindrical rotors 131, 132.

The upper bearing cover 136 and the muffler 137 and the lower bearing cover 138 are coupled to the cylindrical rotors 131 and 132 in the axial direction and between the cylindrical rotors 131 and 132 and the roller 133 and the vane 134 And is provided so as to contact the journal bearing or the thrust bearing at a portion abutting the fixing member 140. [ The upper bearing cover 136 is provided with a discharge port (not shown) through which the compressed refrigerant can be discharged in the compression space and a discharge valve 136A installed therein. In order to reduce the carcass, the discharge port of the upper bearing cover 136 It is preferable to be located adjacent to the vane 133. [ The muffler 337 is coupled to the upper surface of the upper bearing cover 136 and is provided with a discharge chamber capable of reducing the opening and closing noise of the discharge valve 136A and the flow noise of the high-pressure refrigerant, (Not shown) provided in the cover 136 and the muffler 137, respectively. The upper bearing cover 136 and the muffler 137 are coupled to the upper surfaces of the cylindrical rotors 131 and 132 and the lower bearing cover 137 is coupled to the lower surfaces of the cylindrical rotors 131 and 132. The lower ends of the cylindrical rotors 131 and 132 ) At one time by a fastening member such as a long bolt or the like.

The fixing member 140 includes a fixed shaft 141 provided in a cylindrical shape and a fixed shaft 141 in a radial direction of the fixed shaft 141 so as to have a cylindrical shape with a larger diameter than the cylindrical shape of the fixed shaft 141 And an eccentric portion 142 eccentrically formed on the fixed shaft 141. The first oil supply passage 141A through which the oil stored in the hermetically sealed container 210 can be supplied is formed in the lower portion of the fixed shaft 141 while the low pressure refrigerant can be sucked into the upper portion of the fixed shaft 141 Since the vertical suction passage 141B is formed and the first oil supply passage 141A and the vertical suction passage 141B are formed to be isolated from each other, the oil can be prevented from escaping with the refrigerant. The eccentric part 142 is formed to extend in all the radial directions of the fixed shaft 141 and extends in the radial direction of the eccentric part 142 so as to communicate with the vertical suction passage 141B of the fixed shaft 141 A horizontal suction passage 142B is provided. Of course, since the roller 133 rotates along the outer circumferential surface of the eccentric portion 142 and the annular suction guide flow paths 133A and 142C are provided between the inner circumferential surface of the roller 133 and the outer circumferential surface of the eccentric portion 142, The vertical suction passage 141B of the fixed shaft 141, the horizontal suction passage 142B of the eccentric portion 142, the suction guide flow paths 133A and 142C between the roller 133 and the eccentric portion 142, To the compression space along the suction port 133a. Since the upper and lower surfaces of the eccentric portion 142 abut against the upper and lower bearing covers 136 and 137 to act as a thrust surface, it is preferable that a supply passage for the lubricant is formed on the upper and lower surfaces of the eccentric portion 142 And the roller 133 is provided so as to abut against the outer circumferential surface of the eccentric portion 142 so as to be rotatable. Therefore, it is preferable that the supply passage of the lubricating oil extending to the outer circumferential surface is formed inside the eccentric portion 142.

The upper and lower bearings 150 and 160 fix the fixing shaft 141 to the hermetically sealed container 110 so as not to move, and rotatably support the rotary member 130. The upper bearing 150 is fixed to the upper shell 112 of the sealed container 110 by welding or the like after the upper portion of the fixed shaft 141 is fitted. At this time, the upper bearing 150 is formed to be smaller in the radial direction than the lower bearing 160, in order to prevent interference with the discharge tube 114 or the terminal 115 provided in the upper shell 112. Meanwhile, the lower bearing 160 is separated from the lower portion of the fixed shaft 141, the shaft portion of the lower bearing cover 136, which surrounds the lower portion of the fixed shaft 141, is rotatably supported by the thrust bearing 161, And is fixed to the side of the body 111 of the closed container 110 by heat shrinking or three-point welding. The vane 133, the upper and lower bearing covers 135 and 136, the fixed shaft 141 and the eccentric portion 142 are all cast by cast iron, and then the upper and lower bearings 150 and 160 are formed by press working. Grinding and further machining.

The upper and lower bearing covers 136 and 138 are rotatably installed on the fixing member 130 and the lower bearing 160. The upper and lower bearing covers 136 and 138 are rotatably mounted on the fixing member 140. [ More specifically, the upper bearing cover 136 includes an upper shaft portion 136a having an inner circumferential surface surrounding the upper portion of the fixed shaft 141 and a journal bearing, and an upper cover 136b having a thrust bearing on a lower surface thereof, And the upper cover portion 136b is bolted to the bottom surface of the cylindrical rotor 131 or 132. [ The lower bearing cover 138 includes a lower shaft portion 138a having a journal bearing on an inner circumferential surface surrounding the lower portion of the fixed shaft 141 and a lower cover portion 138b having a thrust bearing on an upper surface contacting the bottom surface of the eccentric portion 142 138b. The lower bearing 160 includes a stepped cylindrical bearing portion 160a surrounding the lower shaft portion 138a and a mounting portion 160b extending in the radial direction of the bearing portion 160a to be welded and fixed to the inside of the closed container 110 ). A journal bearing for supporting the outer circumferential surface of the lower shaft portion 138a is provided on the inner circumferential surface of the bearing portion 160a and a thrust bearing for supporting the lower end of the lower shaft portion 138a is provided on the stepped bottom surface of the bearing portion 160a. Or a separate plate-shaped thrust bearing 161 may be interposed therebetween.

Therefore, when the upper and lower bearing covers 136 and 138 are coupled to the cylindrical rotors 131 and 132 and the fixing member 240 in the axial direction, the bottom surface of the upper cover portion 136b of the upper bearing cover 136 contacts the cylindrical rotor And the cover portion 138b of the lower bearing cover 138 is bolted to abut the bottom surface of the cylindrical rotors 131 and 132. As shown in FIG. At this time, since the upper shaft portion 136a is journal-bearing supported on the upper portion of the fixed shaft 141 and the upper cover portion 136b is supported on the upper surface of the eccentric portion 142, The lower bearing portion 138a is supported by the journal bearing under the fixing shaft 141 and the lower cover portion 138b is supported by the lower surface of the eccentric portion 142 so that the lower bearing cover 138 is rotatably supported. Is rotatably provided with respect to the fixing member (140). The lower bearing portion 138a of the lower bearing cover 138 is fitted to the bearing portion 160a of the lower bearing 160. Since the lower bearing cover 138 is supported by the journal surface or the thrust surface, And is rotatably supported with respect to the lower bearing 160.

4 is a plan view of the vane mounting structure of the compressor according to the present invention.

Referring to FIG. 4, the mounting structure of the vane 134 may include a vane mounting hole 132H, which is formed in the inner peripheral surface of the cylindrical rotor 131, 132 in a radial direction and passes through in the axial direction, A pair of bushes 135 are fitted in the bushes 135 and 132 and 132H and then a vane 134 integrally formed on the outer circumferential surface of the roller 133 is inserted between the bushes 135. [ At this time, a compression space is provided between the cylindrical rotors 131 and 132 and the roller 133, and the compression space is divided into the suction pocket S and the compression pocket D by the vane 134. The suction port 133a of the roller 133 is located at one side of the vane 134 so as to be in communication with the suction pocket S and the discharge port of the upper bearing cover 136 (Shown in FIG. 2) is located on the other side of the vane 134 in communication with the compressed pocket D, and is preferably located in close proximity to the vane 134 to reduce the corpuscular mass. As described above, in the compressor of the present invention, the vane 134 integrally formed with the roller 133 is assembled so as to be slidable between the bushes 135 by the use of a roller or a vane separately manufactured from the cylinder in the conventional rotary compressor It is possible to eliminate the friction loss due to the sliding contact caused by being supported by the spring and to reduce the refrigerant leakage between the suction pocket S and the compression pocket D. [

Therefore, when the cylindrical rotors 131 and 132 receive the rotational force by the rotating magnetic field with the stator 120 (shown in Fig. 1), the cylindrical rotors 131 and 132 rotate. The rotating force of the cylindrical rotors 131 and 132 is transmitted to the roller 133 while the vane 134 is fitted in the vane mount 132H of the cylindrical rotors 131 and 132. At this time, ) Reciprocate linearly between the bushes (135). That is, the inner circumferential surfaces of the cylindrical rotors 131 and 132 have portions corresponding to each other on the outer circumferential surface of the roller 133. The portions corresponding to the cylindrical rotors 131 and 132 include cylindrical rotors 131 and 132, The suction pocket S is gradually enlarged while repeating the process of contacting and moving away from each other. As the suction pocket S gradually increases, the refrigerant or the working fluid is sucked into the suction pocket S and the compression pocket D gradually decreases, Compressed, and then discharged.

5 is a plan view showing an operation cycle of the compression mechanism in the example of the compressor according to the present invention.

(A), (b), (c), and (d) as the cylinder type rotors 131 and 132 and the roller 133 rotate as shown in FIG. 5 It shows one cycle in which the relative position changes. More specifically, when the cylindrical rotors 131 and 132 and the rollers 133 are positioned at (a), the refrigerant or the working fluid is sucked into the suction pocket S through the suction port 133a of the roller 133, Compression occurs in the discharged compressed pockets D partitioned by the vane S and the vanes 134. Even when the cylindrical rotors 131 and 132 and the roller 133 are rotated and arrive at the position b, the suction pocket S is extended and the compression pocket D is reduced while the refrigerant or the working fluid is sucked into the suction pocket S , And compression continues in the compressed pocket (D). When the cylindrical rotors 131 and 132 and the roller 133 arrive at the position (c) while rotating, they are continuously sucked into the suction pocket S and when the pressure of the refrigerant or the working fluid in the compressed pocket D becomes equal to or higher than the set pressure The refrigerant or working fluid is discharged through the discharge port of the upper bearing cover 136 (shown in Fig. 2) and the discharge valve 136A (shown in Fig. 2). (d), the suction and discharge of the refrigerant and the working fluid are almost completed.

1 to 5, the rotary member 130 is installed to hang on the fixing member 140 and is rotatably supported on the lower bearing 160, The rotation member 130 and the fixing member 140 must be lubricated at the portion where the rotating member 130 is held by the fixing member 140 and at the portion where the rotating member 130 is supported by the lower bearing 160, And the lower bearing 160 are required to be lubricated between the parts abutting each other.

FIG. 6 is a side sectional view showing an example of the lubricating oil of the compressor according to the present invention, and FIGS. 7 to 9 show lubricating oil paths provided in the fixing member, the lower bearing cover, and the upper bearing cover, respectively, It is a perspective view.

The oil level of the oil stored in the sealed container 110 (shown in FIG. 1) is higher than at least the lower bearing 160 or lower than the lower end of the lower shaft portion 138a of the lower bearing cover 138 as shown in FIGS. It is preferable to keep it high. As described above, since the lower shaft portion 138a of the lower bearing cover 138 is received in the bearing portion 160a of the lower bearing 160, the surfaces contacting each other, that is, the journal surface and the thrust surface, And this contact surface is immersed in the oil, so that it is not necessary to provide a separate lubrication passage.

However, the lubricating oil may be divided into a lower lubricating oil passage, an oil supplying member, and an upper lubricating oil passage, preferably at a portion where the rotating member 130 and the holding member 140 abut each other. The lower lubrication oil is configured to supply the oil stored under the hermetically sealed container 110 (shown in Fig. 1) to the abutting portions of the lower bearing cover 138 and the fixed shaft 141 and the eccentric portion 142, The upper bearing cover 136 and the fixed shaft 141 are configured to pump the oil as it rotates together with the rotating member 130. The upper bearing cover 136 and the fixed shaft 141 are configured to pump the oil pumped by the oil supply member 170, And the eccentric part (142).

The lower lubrication oil includes a first oil supply passage 141A which is a hollow space perpendicular to the lower portion of the fixed shaft 141 and a second oil supply passage 141B which is communicated with the oil supply passage 141A, A first oil supply groove 141b formed on the bottom surface of the eccentric portion 142 abutting against the lower bearing cover 138 to communicate with the oil supply hole 141h and an outer peripheral surface of the fixed shaft 141 immediately below the eccentric portion 142, (a, b). At this time, the first oil supply grooves a and b may be formed anywhere in the abutting portion of the lower bearing cover 138 and the fixed shaft 141 and the eccentric portion 142, but are relatively thick It is preferable to form a ring-shaped groove portion having a side end face 'a' on the lower outer circumferential surface of the lower shaft portion 142 and the lower shaft outer circumferential surface of the fixed shaft 141 which are easy to machine. Of course, it is preferable that the oil surface is formed so that the lower bearing cover 138 is locked. 8, in order to supply oil to the first oil supply grooves a and b even if the oil does not pass through the first oil supply passage 141A and the oil supply hole 141h, A straight or spiral groove 138g perpendicular to the first oil supply grooves a, b may be formed on the inner circumferential surface of the lower shaft portion 138a of the first oil supply groove 138a.

The oil supply member 170 includes a cylindrical hollow shaft portion 171 fitted in the lower shaft portion 138a of the lower bearing cover 138 and a hollow shaft portion 171 provided in the hollow shaft portion 171, And a propeller 172 for supplying oil through the oil passage. Accordingly, the oil supply member 170 is rotated in the state of being locked to the oil, such as the lower bearing cover 136, and the oil rises through the oil supply member 170.

The upper lubrication structure includes two or more oil lines 141A extending to the upper surface of the eccentric portion 142 so as to communicate with the first oil supply passage 141A of the fixed shaft 141 and the first oil supply passage 141A of the fixed shaft 141, The upper surface of the eccentric portion 142 abutting the upper bearing cover 136 to be in communication with the second oil supply passage 142A of the eccentric portion 142 and the second oil supply passage 142A of the eccentric portion 142, The second oil supply passage 142A provided in the eccentric portion 142 includes the eccentric portion 142 and the second oil supply groove 142c formed on the outer circumferential surface of the fixed shaft 141, So as not to overlap with the horizontal suction passage 142B provided in the suction passage 142B. Similarly, although the second oil supply grooves c and d may be formed anywhere in the upper bearing cover 136 and the fixed shaft 141 and the eccentric portion 142, the second oil supply grooves c and d are relatively thick It is preferable that the outer circumferential surface on the upper portion of the fixed shaft 141 and the surface of the eccentric portion 142, which are easy to machine, are formed into a ring-shaped groove having a side cross-section '?'. The oil may be lubricated while lifting the oil stored in the second oil supply grooves c and d along the surface contacting the upper shaft portion 136a of the upper bearing cover 136 and the upper portion of the fixed shaft 142 A straight or spiral groove 136g perpendicular to the second oil supply grooves c and d may be formed on the inner circumferential surface of the upper shaft portion 136a of the upper bearing cover 136 as shown in FIG. have.

Therefore, the oil stored in the lower portion of the hermetic container 110 is formed to have a higher oil level than the oil supply hole 141h, including the end of the lower lower shaft portion 138a of the lower bearing cover 138, B through the first oil supply passage 141A, the oil supply hole 141h of the fixed shaft 141 and the groove 138g of the lower bearing cover 138. The first oil supply groove a, At this time, the lower shaft cover 138a of the lower bearing cover 138 is lubricated with the lower bearing 160 due to being immersed in the oil, and the lower bearing cover 138 is lubricated between the first oil supply grooves a, b And the groove 138g to lubricate between the fixed shaft 141 and the eccentric portion 142 and to be rotatable. The oil is pumped by the oil supply member 170 as the rotary member 130 rotates and this oil is supplied to the first oil supply passage 141A of the fixed shaft 141 and the second oil supply passage 141A of the eccentric portion 142 D into the second oil supply grooves c and d through the oil supply passage 142A and further ascends through the groove 136g of the upper bearing cover 136. [ At this time, the upper bearing cover 136 is lubricated between the fixed shaft 141 and the eccentric portion 142 by the oil collected in the second oil supply grooves c and d and the groove 136g, Respectively.

In the foregoing, the present invention has been described in detail by way of examples on the basis of the embodiments of the present invention and the accompanying drawings. However, the scope of the present invention is not limited by the above embodiments and drawings, and the scope of the present invention will be limited only by the content of the following claims.

1 is a side sectional perspective view showing an example of a compressor according to the present invention.

FIG. 2 is an exploded perspective view showing an example of a compressor according to the present invention. FIG.

3 is a side sectional view showing an example of a compressor according to the present invention.

4 is a plan view showing a vane mounting structure of a compressor according to the present invention.

5 is a plan view showing the operation cycle of the compression mechanism in the compressor according to the present invention.

6 is a side sectional view showing an example of lubricating oil of a compressor according to the present invention.

7 is a perspective view showing a lubricating oil passage provided in a fixing member of a compressor according to the present invention.

8 is a perspective view of a lubricating oil passage provided in a lower bearing cover of a compressor according to the present invention.

9 is a perspective view showing a lubricating oil passage provided in an upper bearing cover of a compressor according to the present invention.

Claims (14)

A sealed container in which oil is stored; A stator fixed in the hermetically sealed container; A first fixing member including a fixed shaft provided with an upper end thereof so as not to move in the sealed container and extending to the inside of the sealed container, and an eccentric portion formed to be eccentric to the fixed shaft; A second fixing member formed to be spaced apart from a lower end of the first fixing member and installed so as not to move in a lower portion of the closed container; A cylindrical rotor that rotates about a fixed axis by a rotating electromagnetic field from the stator, a rotating shaft that rotates together with the cylindrical rotor while receiving the rotating force of the cylindrical rotor, and rotates about the eccentric portion to form a compression space with the cylindrical rotor And a vane for transmitting rotational force from the cylindrical rotor to the roller and dividing the compression space into a suction pocket for suctioning the refrigerant and a compression pocket for compressing and discharging the refrigerant, A rotating member supported; And, And a lubricating oil guiding the oil stored in the hermetically sealed container to a portion where the rotary member and the fixing member are bearing using the rotational force of the rotary member, The rotating member further comprises upper and lower bearing covers that form upper and lower portions of the compression space and rotate about the fixed shaft together with the cylindrical rotor, The lower bearing cover includes a lower shaft portion surrounding the fixed shaft and a lower cover portion coupled with the cylinder to form a lower portion of the compression space, Wherein the lower shaft portion is formed so as to extend beyond the lower end of the fixed shaft and the end portion of the lower shaft portion is rotatably supported while applying a load of the rotary member to the second fixing member. delete delete The method according to claim 1, Characterized in that the second fixing member includes a cylindrical bearing portion having a stepped portion inside, the lower end portion of the lower shaft portion is supported by the step difference of the second fixing member, and the outer surface of the lower shaft portion is journaled to the inner surface of the cylindrical bearing portion. . The method according to claim 1, The lowermost end of the lower shaft portion is installed so as to be immersed in the oil stored in the sealed container, Wherein the lubricating oil includes a groove formed on an outer circumferential surface of the fixed shaft and an inner circumferential surface which is to be bearing on the lower shaft portion. The method according to any one of claims 1, 4, and 5, Further comprising an oil supply member mounted to a lower portion of the rotary member and pumping the oil to the lubricating oil as the rotary member is rotated. The method according to claim 6, The rotating member further comprises upper and lower bearing covers that form upper and lower portions of the compression space and rotate about the fixed shaft together with the cylindrical rotor, The lower bearing cover includes a lower shaft portion surrounding the fixed shaft and a lower cover portion coupled with the cylinder to form a lower portion of the compression space, Wherein the oil supply member comprises a hollow shaft portion press-fitted into the lower shaft portion and a propeller fixed inside the hollow shaft portion so as to spiral up the oil in accordance with rotation of the lower shaft portion. The method according to any one of claims 1, 4, and 5, And the eccentric portion protrudes in all radial directions of the fixed shaft. 9. The method of claim 8, The cylindrical rotor further includes upper and lower bearing covers which form upper and lower portions of the compression space and rotate about the fixed shaft together with the cylindrical rotor, The lower bearing cover includes a lower shaft portion surrounding the fixed shaft and a lower cover portion coupled with the cylinder to form a lower portion of the compression space, Wherein the lubricating oil includes a first oil supply passage formed axially below the fixed shaft and a second oil supply passage formed in the eccentric portion so as to communicate with the first oil supply passage and the eccentric portion. 10. The method of claim 9, Further comprising a refrigerant suction flow passage which is connected to the suction pocket of the compression space through the fixed shaft and the eccentric portion, And the second oil supply passage extends to the upper portion of the eccentric portion by bypassing the refrigerant suction passage. 11. The method of claim 10, An upper groove portion is formed on the upper surface of the eccentric portion, And the upper recessed portion functions as a storage groove of oil for lubrication of the thrust face between the rotary member and the eccentric portion upper surface. 10. The method of claim 9, A lower recessed portion is formed on the bottom surface of the eccentric portion, The lower recess portion functions as a storage groove of the oil for lubrication of the thrust surface between the rotary member and the eccentric portion bottom surface, Further comprising an oil supply hole communicating with the first oil supply passage in a radial direction under the fixing shaft so as to communicate with the first oil supply passage. 10. The method of claim 9, Further comprising an oil storage groove provided at a portion where the eccentric portion, the upper portion of the fixed shaft, and the upper bearing cover are in contact with each other so as to communicate with the second oil supply passage. 14. The method of claim 13, The upper bearing cover includes an upper shaft portion that partially surrounds the upper end of the fixed shaft, Further comprising a groove provided in the inner peripheral surface of the shaft portion of the upper bearing cover so as to communicate with the oil storage groove as the lubricating oil.

Images