JP2006258001A - Hermetic compressor and refrigeration cycle device using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hermetic compressor with good volumetric efficiency, for supplying oil to end faces of vanes and a roller. <P>SOLUTION: In this hermetic compressor, a first oil groove 12a whose one end communicates with a lubricating oil reservoir part 13 is formed in at least one of end faces of the vanes 12 of a rotary compression element 4. An annular second oil groove 10a is formed in an end face on the same side as the first oil groove 12 of the vane 12 of the roller 10, and a third oil groove 6a connecting the first oil groove 12a with the second oil groove 10a is formed in at least one of a main bearing 6 and a sub-bearing 7 opposed to the first oil groove 12a of the vane 12 and the second oil groove 10a of the roller 10. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a hermetic compressor and a refrigeration cycle apparatus using the same, and more particularly to a hermetic compressor having an improved lubricating oil supply system to vanes and roller end faces and a refrigeration cycle apparatus using the same.

  Conventionally, in a rotary compressor, a high pressure type in a casing that directly sucks refrigerant gas from a low pressure side heat exchanger of a refrigeration cycle apparatus into a cylinder chamber of a compression mechanism section and discharges it into a casing via a communication pipe, and a low pressure side heat exchange There is a low pressure type in the casing in which the refrigerant gas from the container is temporarily stored in the casing, sucked into the cylinder chamber from the casing, and discharged out of the casing.

  However, when the inside of the casing has a low pressure, the inside of the casing has a lower pressure than the pressure in the pressure cylinder, and it is difficult to supply oil to the end surfaces of the vanes and rollers.

  As a means for improving the oil supply to the vane, there is one that provides an oil supply groove on the end face of the vane (Patent Document 1), and another means that provides an oil supply groove on the end face of the roller (Patent Document 2). There are oil supply grooves provided on the side surfaces (Patent Document 3), etc., all of which are oil supply to the cylinder chamber on the suction side, and not only oil supply to the end face of the roller, but also volume efficiency. It was causing a decline.

  In order to solve such a problem, as shown in FIG. 9, the present inventors communicated with the vane 31 at one end to the lubricating oil reservoir 32 and opened to the discharge chamber 33d of the cylinder chamber 33 near the other end. In order to solve such problems, the present inventors have developed a hermetic compressor 35 that is provided with a lubricating oil supply groove 31a for supplying oil to the end surface 34e of the roller 34 from the lubricating oil reservoir 32. As shown in FIGS. 9 and 10, the vane 41 is provided with a lubricating oil storage groove 41 a closed at both ends. When the lubricating oil storage groove 41 a is open to the lubricating oil storage part 42, the oil is stored and the lubricating oil A hermetic compressor 45 that supplies oil from the lubricating oil storage groove 41a to the end surface 44a of the roller 44 when the storage groove 41a opens into the discharge chamber 43d of the cylinder chamber 43 has been developed (not known).

However, since these do not supply oil directly to the end face of the roller, the oil supply to the end face is insufficient and there is room for improvement.
Japanese Patent Laid-Open No. 5-240179 JP-A-10-26091 JP-A-6-264881

  The present invention has been made in consideration of the above-described circumstances, and an object of the present invention is to provide a hermetic compressor that can supply oil to the end faces of vanes and rollers and has a high volumetric efficiency, and a refrigeration cycle apparatus using the same.

  In order to achieve the above-described object, a hermetic compressor according to the present invention is a hermetic compressor in which a motor part and a compression mechanism part connected to the motor part via a rotating shaft are accommodated in a hermetic case. The compression mechanism includes: a cylinder that forms a cylinder chamber; a roller that rotates eccentrically in the cylinder chamber; a vane that abuts against an outer peripheral surface of the roller and divides the cylinder chamber into a suction chamber and a compression chamber; A first bearing having a main bearing and a sub-bearing that contact the end face of the cylinder to cover the cylinder chamber and pivotally support the rotating shaft; one end of the vane communicates with the lubricating oil reservoir; An oil groove is provided, an annular second oil groove is provided on the end surface of the roller on the same side as the first oil groove, and the main bearing facing the first oil groove and the second oil groove; At least one of the secondary bearings Characterized in that a third oil groove which communicates the first oil groove and the second oil groove.

  A refrigeration cycle apparatus according to the present invention includes the hermetic compressor according to any one of claims 1 to 3, a condenser, an expansion device, and an evaporator, and is a hydrocarbon-based refrigerant. It is characterized by using at least one of a refrigerant and carbon dioxide.

  According to the hermetic compressor according to the present invention, it is possible to provide a hermetic compressor that can supply oil to the end faces of the vane and the roller and has high volume efficiency.

  Further, according to the refrigeration cycle apparatus according to the present invention, it is possible to provide a refrigeration cycle apparatus including a hermetic compressor that can supply oil to the end faces of the vane and the roller and has a high volumetric efficiency.

  Hereinafter, a hermetic compressor according to a first embodiment of the present invention will be described with reference to the accompanying drawings.

  FIG. 1 is a longitudinal sectional view of a hermetic compressor according to the first embodiment, and FIG. 2 is a sectional view taken along line AA of FIG.

  As shown in FIG. 1, the hermetic compressor 1 according to the first embodiment is a compressor of a type in which the hermetic case 2 has a low pressure, and the electric element 3 and the rotary compression element 4 are disposed inside the hermetic case 2. It is constructed by interior decoration. In the compression element 4, a rotary shaft 5 extending from the electric element 3 is inserted into a main bearing 6 and a sub bearing 7, and a cylinder 8 is disposed between the main bearing 6 and the sub bearing 7. In the chamber 9, a cylindrical roller 10 is fitted to an eccentric portion 5 a formed on the rotary shaft 5, while a vane 12 that slides in a vane groove 11 provided in the cylinder 8 as shown in FIG. 2. Is arranged.

  The vane 12 is always pressed in the direction of the roller 10 by a spring 14 housed in a vane chamber that forms a lubricating oil reservoir 13, and the vane groove 11 is slidably brought into contact with the outer peripheral surface of the roller according to the rotation of the eccentric portion 5a and the roller 10. The inside of the cylinder chamber 9 is reciprocally moved to pressure-divide the suction chamber 9s and the compression chamber 9d.

  Further, as shown in FIG. 1, the discharge side of the cylinder chamber 9 is communicated with an oil separator 15 that separates lubricating oil by a discharge pipe 16 through a discharge hole 9a, and the oil separator 15 further includes a lubricating oil reservoir. 13 is communicated with an oil return pipe 17.

  As shown in FIGS. 1 and 3, a first oil groove 12 a having one end communicating with the lubricating oil reservoir 13 is provided on one end face of the vane 12. Further, as shown in FIG. An end surface 10e on the same side as the first oil groove 12a is provided with an annular second oil groove 10a. As shown in FIG. 1, the first oil groove 12a and the second oil groove 12a are provided. A third oil groove 6a is provided in at least one of the main bearing 6 and the sub bearing 7 facing the groove 10a.

  The first oil groove 12a, the second oil groove 10a, and the third oil groove 6a are intermittently communicated to form a roller end surface oil supply system W.

The first oil groove 12a and the second oil groove 10a are provided in the third oil groove 6a only at the position near the top dead center (near the rotation angle of 0 °) of the vane 12 in the compressed state shown in FIG. And the oil is supplied to the vane 12 and the roller end surface 10e,
From the compression start state (rotation angle 90 °) shown in FIG. 4B to immediately before the completion of compression shown in FIG. 4D (rotation angle 270 °), the first oil groove 12a and the second oil groove 10a are The roller end surface oil supply system W is in a non-oiled state.

  Thus, since the oil supply to the vane 12 and the roller end surface 10e by the roller end surface oil supply system W is performed intermittently, the lubricating oil is supplied to the roller end surface 10e to ensure an oil seal, and the third oil Since the groove 6a passes through the vicinity of the contact portion of the vane tip with the roller 10, oil supply to the vane tip is also ensured, reliability is improved, and the second oil groove 10a and the tip of the vane 12 are excessive. Inflow of lubricating oil can be suppressed, volume efficiency can be improved, and increase in oil discharge can be suppressed.

  In addition, since the lubricating oil at the discharge pressure can be guided to the vane 12 and the roller end surface 10e through the roller end surface oil supply system W, it is possible to suppress leakage of high-pressure gas at the roller end surface 10e and to improve performance. .

  Next, a second embodiment of the hermetic compressor according to the present invention will be described.

  In the first embodiment, the roller end face oil supply system communicates with the lubricating oil reservoir at one end, and a first oil groove provided on the end face of the vane and a second oil groove provided on the roller end face are provided in the main bearing. Whereas the third oil groove is intermittently communicated and intermittently lubricated, the second embodiment has a roller end surface oil supply system provided on the end surface of the vane, and the first oil groove and roller end surface closed at both ends. The second oil groove provided in the main bearing, the third oil groove provided in the main bearing, and the fourth oil groove provided in the main bearing and communicating with the lubricating oil reservoir at one end are intermittently communicated, Refuel.

  For example, as shown in FIGS. 5 and 6, the roller end surface oil supply system W <b> 1 is provided on one end surface of the vane 12 via a third oil groove 61 a and a fourth oil groove 61 b provided in the main bearing 6. The first oil groove 121a that is provided and closed at both ends and the annular second oil groove 10a provided on the roller end surface 10e communicate intermittently.

  Accordingly, the first oil groove 121a and the second oil groove 10a are provided with the third oil groove only at the position near the top dead center (near the rotation angle of 0 °) of the vane 12 in the compressed state shown in FIG. A communication state is established through the groove 61a and the fourth oil groove 61b, and oil is supplied to the vane 12 and the roller end surface 10e. From the compression start state (rotation angle 90 °) shown in FIG. Immediately before completion of compression (rotation angle 270 °), the first oil groove 121a and the second oil groove 10a are in a disconnected state, and the roller end face oil supply system W1 is in a non-oil supply state. As a result, since the lubricating oil at the discharge pressure can be guided to the vane 12 and the roller end surface 10e via the roller end surface oil supply system W1, the leakage of the high pressure gas at the roller end surface 10e can be suppressed, and the performance can be improved. it can.

  According to the hermetic compressor of each embodiment as described above, a hermetic compressor that can supply oil to the end faces of the vane and the roller and has high volume efficiency is realized.

  As shown in FIG. 8, the refrigeration cycle apparatus 20 according to the present invention includes a hermetic compressor 1 according to the above-described invention, a condenser 21 connected to the hermetic compressor 1 via an oil separator 15, An expansion device 22 connected to the condenser 21 and an evaporator 23 connected to the expansion device 22 and connected to the hermetic compressor 1 are provided. At least one of a hydrocarbon-based refrigerant and carbon dioxide is used as the refrigerant. Suitable for use. As a result, a refrigeration cycle apparatus including a hermetic compressor that can supply oil to the end faces of the vanes and the rollers and has a high volumetric efficiency is realized.

  In each of the above-described embodiments, the example in which the number of cylinders is one has been described. However, the same effect can be obtained even in a type in which a plurality of cylinders are provided and the inside of the sealed case has discharge pressure or intermediate pressure.

1 is a longitudinal sectional view of a hermetic compressor according to a first embodiment of the present invention. Sectional drawing in alignment with the AA of FIG. The perspective view of the vane used for the hermetic compressor concerning the present invention. The conceptual diagram which shows the compression process of the hermetic compressor which concerns on 1st Embodiment of this invention. The longitudinal cross-sectional view which expands and shows the vane vicinity of the hermetic compressor which concerns on 2nd Embodiment of this invention. The perspective view of other embodiment of the vane used for the hermetic compressor concerning the present invention. The conceptual diagram which shows the compression process of the hermetic type compressor which concerns on 2nd Embodiment of this invention. The conceptual diagram of the refrigerating-cycle apparatus which concerns on this invention. The top view which expands and shows the vane vicinity which concerns on the prior art with respect to this invention. The top view which expands and shows the vane vicinity which concerns on the prior art with respect to this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Sealed compressor, 2 ... Sealed case, 3 ... Electric element, 4 ... Rotary compression element, 5 ... Rotary shaft, 6 ... Main bearing, 6a ... 3rd oil groove, 7 ... Secondary bearing, 8 ... Cylinder , 9 ... Cylinder chamber, 9s ... Suction chamber, compression chamber 9d ... 10 ... Roller, 10e ... Roller end face, 10a ... Second oil groove, 12 ... Vane, 12a ... First oil groove, 13 ... Lubricating oil reservoir , 15 ... oil separator, 16 ... discharge pipe, 17 ... oil return pipe, W ... roller end face oil supply system.

Claims (4)

In a hermetic compressor in which a motor unit and a compression mechanism unit coupled to the motor unit via a rotating shaft are accommodated in a hermetic case, the compression mechanism unit includes a cylinder forming a cylinder chamber, and the cylinder A roller that rotates eccentrically in the chamber, a vane that abuts on the outer peripheral surface of the roller and divides the cylinder chamber into a suction chamber and a compression chamber, and abuts on an end surface of the cylinder to cover the cylinder chamber and the rotation shaft A roller having a main bearing and a sub-bearing that support each other and having a first oil groove with one end communicating with a lubricating oil reservoir on at least one end surface of the vane, and the roller on the same side as the first oil groove An annular second oil groove is provided on the end surface of the first oil groove, and the first oil groove and the second oil are provided in at least one of the main bearing and the sub-bearing opposed to the first oil groove and the second oil groove. A third oil groove communicating with the groove is provided. Closed type compressor, characterized in that the. A fourth oil groove that closes both ends of the first oil groove and intermittently communicates the first oil groove and the lubricating oil reservoir is formed in at least one of the main bearing and the sub-bearing. The hermetic compressor according to claim 2, wherein the hermetic compressor is provided. Refrigerant is sucked into the compression mechanism through the space inside the sealed case, an oil separator is connected to the discharge passage, and a vane chamber which is sealed on the back side of the vane and forms a lubricating oil reservoir is formed, and the oil The hermetic compressor according to claim 1 or 2, wherein the lubricating oil separated by the separator is guided to the vane chamber, and the first oil groove communicates with the vane chamber. A hermetic compressor according to any one of claims 1 to 3, a condenser, an expansion device, and an evaporator, wherein at least one of a hydrocarbon-based refrigerant and carbon dioxide is used as a refrigerant. A refrigeration cycle apparatus characterized by.

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