JP2005325734A - Compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve problems in a compressor with a large volume of a high pressure chamber for improving muffler effect, and an introducing hole disposed at a high position for improving lubricating oil separation effect that more lubricant need be enclosed because lubricant is not discharged, but remains at a bottom part of the high pressure chamber, and that remaining lubricant reduces the substantial volume of the high pressure chamber, and reduces muffler effect. <P>SOLUTION: In this compressor, an introducing hole 53 is formed at an upper part of the high pressure chamber 14 to be communicated with a separation chamber 51, and a connection passage 59 is provided at an inlet part of the introducing hole 53 to connect the introducing hole 53 from around the bottom part of the high pressure chamber 14. Lubricant at the bottom part of the high pressure chamber 14 is thus prevented from staying, but it is fed to the introducing hole 53. Increase of necessary quantity of enclosed lubricant or deterioration of muffler effect due to staying of the lubricant in the bottom part of the high pressure chamber 14 can thus be prevented. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a compressor that compresses a fluid, and more particularly to oil separation in a compressor that is provided for an air conditioner for an automobile.

  In such a compressor, a part of the compressor lubricating oil is discharged into the system cycle of the air conditioner together with the compressed fluid. The more the amount of compressor lubricant discharged with the fluid is discharged during the cycle, the lower the system efficiency.

  For this reason, in order to suppress the discharge of the lubricating oil from the compressor into the system cycle of the air conditioner, a separation chamber for separating the lubricating oil from the compressed fluid is provided on the discharge side of the compression mechanism (for example, a patent Reference 1).

Here, an oil storage chamber for storing the separated lubricating oil is formed below the separation chamber (in the direction of gravity), and a discharge hole for discharging the lubricating oil separated in the separation chamber to the oil storage chamber is formed in the separation chamber. ing. The oil storage chamber is formed with a collision wall that collides the lubricating oil blown from the discharge hole and prevents the lubricating oil blown from the discharge hole from directly colliding with the oil surface in the oil storage chamber. Thereby, the lubricating oil blown out from the discharge hole is first collided with the collision wall, thereby preventing direct collision with the oil surface in the oil storage chamber. Therefore, the oil level can be prevented from fluctuating, so that the lubricating oil is prevented from flowing backward from the oil storage chamber to the separation chamber.
JP 11-82352 A

  By the way, in the said conventional compressor, when the volume of a high pressure chamber is taken widely, it becomes a muffler effect and discharge pulsation reduction is attained. Further, in order to enhance the effect of separating the lubricating oil from the compressed fluid, it is desirable to arrange the introduction hole communicating with the high pressure chamber and the separation chamber at a high position so as to take a distance between the introduction hole and the discharge hole. . However, if the introduction hole is arranged at a high position, the lubricating oil separated in the high pressure chamber is not discharged and stays at the bottom of the high pressure chamber. When the lubricating oil stays at the bottom of the high-pressure chamber in this way, it is necessary to increase the amount of the lubricating oil, and the remaining lubricating oil reduces the substantial volume of the high-pressure chamber and lowers the muffler effect.

  An object of the present invention is to solve such a conventional problem, and to provide a configuration in which lubricating oil does not stay in the high pressure chamber even when the volume of the high pressure chamber is wide, and the lubricating oil can be sufficiently separated. To do.

  In order to achieve the above object, according to the present invention, by providing a communication passage connecting the introduction hole from the vicinity of the bottom of the high-pressure chamber, a configuration in which the lubricating oil does not stay at the bottom of the high-pressure chamber is possible.

  According to the present invention, it is possible to reduce the amount of lubricating oil enclosed. Further, the volume of the high pressure chamber can be secured, and the discharge pulsation can be reduced by the muffler effect.

According to a first aspect of the present invention, a compression mechanism for compressing a gas-fluid containing lubricating oil, a high-pressure chamber into which the gas-fluid compressed by the compression mechanism is guided, and at least a part of the lubricant contained in the gas-fluid are separated. In the compressor, and the high-pressure chamber and the separation chamber communicate with each other through an introduction hole, and the high-pressure chamber is in communication with the high-pressure chamber and the oil storage chamber in which the lubricating oil separated from the gas fluid in the separation chamber is stored. By providing a communication passage connecting the introduction hole from the vicinity of the bottom of the chamber, lubricating oil does not stay at the bottom of the high-pressure chamber, and the amount of required lubricating oil can be reduced, further ensuring the volume of the high-pressure chamber Therefore, the discharge pulsation can be reduced by the muffler effect.

  The second invention has a small hole for releasing air especially in the upper part (direction of gravity) of the communication passage of the first invention, so that the air inside the high pressure chamber passes through this small hole for releasing air when lubricating oil is filled. Therefore, the sealing property of the lubricating oil can be improved.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a longitudinal sectional view of a compressor according to Embodiment 1 of the present invention. FIG. 2 is a cross-sectional view of the compressor shown in FIG. FIG. 3 is a view as seen from the arrow A of the compressor shown in FIG. 1 and shows a high-pressure case viewed from the compressor working chamber side.

  1 to 3, in this compressor, a substantially cylindrical rotor 2 is rotatably accommodated in a cylinder 1 having a cylindrical inner wall so that a part of the outer periphery forms a minute gap with the inner wall of the cylinder 1. . A plurality of vane slots 3 are provided at equal intervals in the rotor 2, and vanes 4 are slidably inserted into the vane slots 3. The rotor 2 rotates when a drive shaft 5 formed integrally therewith is driven to rotate.

  The opening portions at both ends of the cylinder 1 are respectively closed by the front side plate 6 and the rear side plate 7, and the working chamber 8 is formed inside the cylinder 1. A suction port 9 and a discharge port 10 communicate with the working chamber 8, the discharge port 10 is connected to a high-pressure passage 13, and a discharge valve 11 is disposed between the discharge port 10 and the high-pressure passage 13. A high pressure case 12 is attached to the rear side plate 7, and a high pressure chamber 14, a separation chamber 51, and an oil storage chamber 52 are formed in the high pressure case 12. An introduction hole 53 arranged so as to communicate with the separation chamber 51 is opened at the upper part of the high pressure chamber 14, and a communication passage 59 connecting the introduction hole 53 from the bottom of the high pressure chamber 14 is provided at the entrance of the introduction hole 53. ing.

  A predetermined volume is secured in the high pressure chamber 14 in order to perform a muffler effect to reduce high pressure pulsation. Further, the position of the introduction hole 53 is preferably as far as possible from the oil storage chamber side opening 54 in order to improve the separation efficiency of the lubricating oil, and is configured at the upper portion of the high pressure chamber 14 with a sufficient volume. Yes.

  The separation chamber 51 is provided to separate the lubricating oil contained in the compressed high-pressure fluid. The separation chamber 51 communicates with the oil storage chamber 52 through the discharge hole 50. The lubricating oil stored in the oil storage chamber 52 is supplied to the rotor 2, the vane 4, the inner wall of the cylinder 1, and the like constituting the compression mechanism via the oil supply passage 18, lubricates each part, and is supplied to the vane back pressure chamber 17. The pressure serves to push out the vane 4 to the outside of the rotor 2.

  Lubricating oil is supplied from an oil storage chamber 52 through an oil supply passage 18 that supplies the lubricating oil to the compression mechanism, and a vane back pressure adjusting device 16 is provided in the middle of the oil supply passage 18. The vane back pressure adjusting device 16 controls the oil supply pressure and the amount of oil supplied to the compression mechanism according to the fluid (refrigerant) pressure around the compression mechanism.

When power is transmitted from a driving source such as an engine and the drive shaft 5 and the rotor 2 rotate clockwise in FIG. 2, a low-pressure fluid (refrigerant) flows into the working chamber 8 from the suction port 9. The high pressure fluid compressed with the rotation of the rotor 2 pushes up the discharge valve 11 from the discharge port 10 and is discharged into the high pressure passage 13 and flows into the high pressure chamber 14. The high-pressure fluid flowing into the high-pressure chamber 14 passes through the communication passage 59 and flows into the separation chamber 51 from the introduction hole 53, and the lubricating oil contained in the high-pressure fluid is separated in the separation chamber 51.

  By the way, the separation chamber 51 is provided with a cylindrical space, and the introduction hole 53 for guiding the high-pressure fluid to the cylindrical space is formed so as to guide the high-pressure fluid in the tangential direction of the cylindrical space. Lubricating oil contained in the high-pressure fluid comes into contact with the inner peripheral surface 49 of the cylindrical portion of the separation chamber 51 and is separated from the refrigerant gas by centrifugal force during swirling in the cylindrical space. The high-pressure fluid is discharged from the gas outlet 58 to the outside of the compressor, and the separated lubricating oil moves downward along the inner peripheral surface 49. In this embodiment, a substantially inverted conical space is formed at the lower part of the cylindrical space, and the separation chamber 51 is mainly composed of the substantially inverted conical space and the above-described cylindrical space.

  An oil guide path 50 that guides the separated lubricating oil to the oil storage chamber 52 is formed at the lower end of the separation chamber 51. As shown in FIG. 1, the oil guide passage 50 is formed vertically downward, and the oil storage chamber side opening 54 of the oil guide passage 50 is perpendicular to the oil level of the lubricating oil stored in the oil storage chamber 52. In the lower lubricating oil. A reintroduction hole 57 that allows fluid movement between the oil storage chamber 52 and the separation chamber 51 is provided on the basis of the technical idea of utilizing the weight of the separated lubricating oil. Accordingly, the gas flow such as the refrigerant gas stored in the upper part of the oil storage chamber 52 is moved to the separation chamber so that the oil level in the separation chamber is equal to or slightly lower than the oil level of the oil storage chamber in the vertical direction. Is acting on.

  In the compressor configured as described above, the lubricating oil in the lower portion of the high pressure chamber 14 can be guided to the separation chamber 51 by arranging the communication passage 59 at the entrance of the introduction hole 53.

  When the operation is performed without the communication passage 59, a high pressure fluid containing lubricating oil collides with the inner surface of the high pressure chamber 14, and a part of the lubricating oil is separated and stays at the bottom of the high pressure chamber 14 (approximately 10 to 20 cc). If the lubricating oil stays at the bottom of the high-pressure chamber 14, the circulation rate of the lubricating oil necessary for the cycle is lowered, which may affect the durability, and it is necessary to increase the amount of the lubricating oil enclosed. In addition, the volume of the high pressure chamber 14 cannot be secured due to the retained lubricating oil, and it becomes difficult to secure the volume of the high pressure chamber 14 effective for high pressure pulsation.

  Further, an air vent hole 60 having a diameter of approximately 1 mm smaller than the opening area of the introduction hole 53 communicating with the high pressure chamber 14 is formed in the upper portion of the communication passage 59. As a result, the air inside the high-pressure chamber 14 is discharged to the outside through the air vent small hole 60 when the lubricating oil is sealed, so that the sealing property of the lubricating oil can be improved.

  In the above-described embodiment, the sliding vane type rotary compression mechanism is used as the compressor. However, the present invention is not limited to this, and other compression mechanisms such as a rolling piston type and a scroll type may be used. Good.

  As described above, in the present embodiment, by arranging the communication passage 59 at the entrance of the introduction hole 53, the lubricating oil does not stay at the bottom of the high-pressure chamber 14, and the amount of the necessary lubricating oil can be reduced. Further, the volume of the high pressure chamber 14 can be secured, and the discharge pulsation can be reduced by the muffler effect.

  As described above, the compressor according to the present invention can reduce the amount of the required lubricating oil, and can secure the volume of the high-pressure chamber, thereby reducing discharge pulsation due to the muffler effect. It can also be applied to compressors having other types of compression mechanisms.

The longitudinal cross-sectional view of the compressor in Embodiment 1 of this invention BB sectional view of the compressor shown in FIG. A arrow view of the compressor shown in FIG.

Explanation of symbols

1 cylinder 2 rotor 3 vane slot 4 vane 5 drive shaft 6 front side plate 7 rear side plate 8 working chamber 9 suction port 10 discharge port 11 discharge valve 12 high pressure case 13 high pressure passage 14 high pressure chamber 51 separation chamber 52 oil storage chamber 53 introduction hole 59 Communication passage 60 Air vent hole

Claims (2)

A compression mechanism for compressing a gas fluid containing lubricating oil; a high-pressure chamber into which the gas fluid compressed by the compression mechanism is guided; and a separation chamber in which at least a part of the lubricating oil contained in the gas fluid is separated; An oil storage chamber in which lubricating oil separated from the gas fluid in the separation chamber is stored, and an introduction hole communicating the high pressure chamber and the separation chamber is formed in an upper portion of the high pressure chamber. A compressor characterized in that a communication passage connecting the introduction hole from the vicinity of the bottom is provided. The compressor according to claim 1, wherein an air vent hole is formed in an upper portion of the communication passage.

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