JP2005105986A - Vertical rotary compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vertical rotary compressor capable of reducing an oil delivery quantity to an external part. <P>SOLUTION: This vertical rotary compressor 10 is formed by storing a motor-driven element 14 as a driving element, and a rotary compression mechanism part 18 driven by this motor-driven element 14, in a sealed vessel 12. An oil separating mechanism 100 as an oil separating means for centrifugally separating oil in a refrigerant compressed and delivered by the rotary compression mechanism part 18, is arranged in a space between the sealed vessel 12 and the rotary compression mechanism part 18 in the sealed vessel 12. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a vertical rotary compressor in which a driving element and a rotary compression mechanism portion driven by the driving element are housed in an airtight container.

  Conventionally, in this type of rotary compressor, for example, an internal intermediate pressure type multi-stage (two-stage) compression rotary compressor provided with first and second rotary compression elements, a drive element and a rotation driven by the drive element in a hermetic container It is comprised by the compression mechanism part.

  Then, the refrigerant gas is sucked into the low pressure chamber side of the cylinder from the suction port of the first rotary compression element and is compressed by the operation of the roller and the vane to become an intermediate pressure from the high pressure chamber side of the cylinder through the discharge port and the discharge silencer chamber. It is discharged into a closed container. The intermediate-pressure refrigerant gas in the sealed container is sucked into the low-pressure chamber side of the cylinder from the suction port of the second rotary compression element, and the second stage compression is performed by the operation of the roller and the vane, so The refrigerant gas is discharged from the high-pressure chamber side through the discharge port and discharge silencer chamber to the outside of the compressor.

Also, the bottom of the sealed container is an oil reservoir, and oil is sucked up from the oil reservoir by an oil pump (oil supply means) attached to one end (lower end) of the rotating shaft, and is transferred to the sliding portion of the rotary compression mechanism. Supply and lubrication and sealing are performed (for example, refer to Patent Document 1).
Japanese Patent No. 25007047

  However, the oil mixed in the refrigerant gas compressed by the first rotary compression element as described above is discharged into the hermetic container and separated to some extent from the refrigerant gas in the process of moving through the space in the hermetic container. The oil mixed in the refrigerant gas compressed by the second rotary compression element was directly discharged to the outside of the compressor together with the refrigerant gas.

  For this reason, there has been a problem that the oil in the oil reservoir is insufficient and the sliding performance and the sealing performance deteriorate. In addition, the oil discharged to the outside of the compressor may adversely affect the refrigerant circuit, for example, hindering the refrigerant circulation in the refrigerant circuit.

  Further, although an effort has been made to separate the oil from the discharged refrigerant gas by connecting an oil separator to a pipe outside the sealed container and return it to the compressor, there has been a problem that the installation space is increased.

  In the vertical rotary compressor according to the first aspect of the present invention, a drive element and a rotary compression mechanism portion driven by the drive element are accommodated in a hermetic container, and compressed by the rotary compression mechanism portion. The oil separation means for centrifuging the oil in the discharged refrigerant is provided in the sealed container.

  A vertical rotary compressor according to a second aspect of the present invention is the above-described invention, wherein the oil separation means is provided in the vicinity of the rotary compression mechanism portion in the space between the sealed container and the rotary compression mechanism portion.

  According to the first aspect of the present invention, since the oil separation means for centrifuging the oil in the refrigerant compressed and discharged by the rotary compression mechanism is provided in the sealed container, the rotary compressor can be prevented from being enlarged. The amount of oil discharged to the outside of the rotary compressor can be significantly reduced.

  Therefore, it is possible to prevent an increase in the size of the refrigerant circuit including the rotary compressor and contribute to the downsizing of the device.

  According to the invention of claim 2, in addition to the above invention, it is possible to avoid the enlargement of the total length of the rotary compressor by providing the oil separating means.

  In particular, since the oil separation means is provided in the vicinity of the rotary compression mechanism in the sealed container, the path until the refrigerant compressed by the rotary compression mechanism enters the oil separation means can be shortened. The design change of the rotary compressor can be minimized.

  In order to solve the related art, an object of the present invention is to provide a vertical rotary compressor capable of reducing the amount of oil discharged to the outside. Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 shows a longitudinal sectional view of an internal intermediate pressure type multi-stage (two-stage) compression rotary compressor 10 having first and second rotary compression elements 32 and 34 as an embodiment of the vertical rotary compressor of the present invention. ing.

  In FIG. 1, reference numeral 10 denotes an internal intermediate pressure multi-stage compression type vertical rotary compressor. The rotary compressor 10 is arranged and housed in a vertical cylindrical sealed container 12 made of a steel plate and above the internal space of the sealed container 12. The first rotary compression element 32 (first stage) and the second rotary compression arranged on the lower side of the electric element 14 and driven by the rotating shaft 16 of the electric element 14. The rotary compression mechanism 18 is composed of an element 34 (second stage).

  The sealed container 12 has an oil sump 13 at the bottom, a container body 12A that houses the electric element 14 and the rotary compression mechanism 18, and a generally bowl-shaped end cap (lid) 12B that closes the upper opening of the container body 12A. A circular mounting hole 12D is formed at the center of the upper surface of the end cap 12B, and a terminal (wiring is omitted) 20 for supplying power to the electric element 14 is formed in the mounting hole 12D. Is attached.

  The electric element 14 includes a stator 22 attached in an annular shape along the inner peripheral surface of the upper space of the hermetic container 12, and a rotor 24 inserted and arranged with a slight gap inside the stator 22. The rotor 24 is fixed to a rotating shaft 16 that passes through the center and extends in the vertical direction.

  The stator 22 has a laminated body 26 in which donut-shaped electromagnetic steel plates are laminated, and a stator coil 28 wound around the teeth of the laminated body 26 by a direct winding (concentrated winding) method. Similarly to the stator 22, the rotor 24 is also formed by a laminated body 30 of electromagnetic steel plates, and a permanent magnet MG is inserted into the laminated body 30.

  The rotary compression mechanism 18 includes upper and lower cylinders 38 and 40 for constituting the first and second rotary compression elements 32 and 34, and upper and lower eccentric parts 42 provided in the upper and lower cylinders 38 and 40, respectively. The upper and lower rollers 46 and 48 that are fitted to the shaft 44 and rotate eccentrically, and the intermediate partition plate 36 that is interposed between the upper and lower cylinders 38 and 40 and the rollers 46 and 48 and partitions the first and second rotary compression elements 32 and 34. The vanes 50 and 52 that abut the rollers 46 and 48 and divide the upper and lower cylinders 38 and 40 into a low-pressure chamber side and a high-pressure chamber side, respectively, an upper opening surface of the upper cylinder 38 and a lower opening surface of the lower cylinder 40 And an upper support member 54 and a lower support member 56 as support members that also serve as bearings for the rotary shaft 16.

  The upper support member 54 and the lower support member 56 are partially recessed with a suction passage 60 (the upper suction passage is not shown) that communicates with the inside of the upper and lower cylinders 38 and 40 at a suction port (not shown), Discharge silencing chambers 62 and 64 formed by closing the recessed portion with an upper cover 66 and a lower cover 68 are provided.

  In this case, the lower cover 68 is fixed to the lower support member 56 from below with the main bolts 129. The front ends of the main bolts 129 are screwed into the upper support member 54.

  The discharge silencer chamber 64 of the first rotary compression element 32 and the inside of the sealed container 12 are communicated with each other through a communication path. This communication path is a hole (not shown) that passes through the lower support member 56, the upper support member 54, the upper cover 66, the upper and lower cylinders 38 and 40, and the intermediate partition plate 36. In this case, an intermediate discharge pipe 121 is erected at the upper end of the communication path, and an intermediate pressure refrigerant is discharged from the intermediate discharge pipe 121 into the sealed container 12.

  In addition, the electric element 14 is provided above the upper cover 66 in the sealed container 12 with a predetermined interval. The periphery of the upper cover 66 is fixed to the upper support member 54 from above by main bolts 78. The front ends of the main bolts 78 are screwed into the lower support member 56.

  On the other hand, a vertical oil hole 80 and lateral oil supply holes 82 and 84 (also formed in the upper and lower eccentric parts 42 and 44) communicating with the oil hole 80 are formed in the rotary shaft 16 at the shaft center. From here, oil is supplied to the sliding portion of the rotary compression mechanism 18 and the like.

  In this case, the existing oil such as mineral oil (mineral oil), PAG (polyalkylene glycol), alkylbenzene oil, ether oil, ester oil is used as the lubricating oil.

  On the side surface of the container main body 12A of the sealed container 12, a suction passage 60 (upper suction passage is not shown) of the upper support member 54 and the lower support member 56, and an upper side of the upper cover 66 (substantially corresponds to the lower end of the electric element 14) The sleeves 141, 142, 143, and 144 are fixed by welding at positions corresponding to the positions of The sleeves 141 and 142 are adjacent to each other in the vertical direction, and the sleeve 143 is shifted from the sleeve 144 by approximately 90 degrees.

  In the sleeve 141, one end of a refrigerant introduction pipe 92 for introducing refrigerant gas into the upper cylinder 38 is inserted and connected, and one end of the refrigerant introduction pipe 92 communicates with a suction passage (not shown) of the upper cylinder 38. The refrigerant introduction pipe 92 passes through the upper side of the sealed container 12 to reach the sleeve 144, and the other end is inserted and connected into the sleeve 144 to communicate with the sealed container 12.

  One end of a refrigerant introduction pipe 94 for introducing refrigerant gas into the lower cylinder 40 is inserted into and connected to the sleeve 142, and one end of the refrigerant introduction pipe 94 communicates with the suction passage 60 of the lower cylinder 40. Further, a refrigerant discharge pipe 96 is inserted and connected into the sleeve 143, and one end of the refrigerant discharge pipe 96 is connected to an oil separation mechanism 100 as oil separation means described later.

  In the vicinity of the rotary compression mechanism unit 18 in the sealed container 12 and between the rotary compression mechanism unit 18 and the inner peripheral surface of the sealed container 12, a second rotary compression is performed. An oil separation mechanism 100 is provided for separating oil in the refrigerant compressed and discharged by the element 34.

  Here, the oil separation mechanism 100 described above will be described with reference to FIG. That is, the oil separation mechanism 100 includes a main body 101, a vertically long cylindrical shape formed in the main body 101, a space portion 102 having an open top surface, and a communication pipe 104 that closes the opening portion on the top surface of the space portion 102. A communication hole 106 for communicating the discharge silencer chamber 62 of the second rotary compression element 34 and the space 102 of the oil separation mechanism 100 via a communication passage 63 formed in the upper support member 54, It is composed of pores 108 formed on the lower side.

  The communication pipe 104 is formed to have substantially the same size as the inner diameter of the space portion 102, and is inserted and connected through an opening on the upper surface of the space portion 102. The communication pipe 104 has a tip 104A (lower end) having a predetermined length and a thinner pipe than the other parts, and the tip 104A opens downward in the space 102. Further, a gap is formed between the space portion 102 and the distal end portion 104 </ b> A of the communication pipe 104. The communication hole 106 is formed at a position substantially corresponding to the upper end of the distal end portion 104A of the communication tube 104, and the refrigerant from the discharge silencing chamber 62 passes through the communication passage 63 from the communication hole 106 to the distal end portion 104A of the communication tube 104. It is formed so as to be discharged toward the outer wall surface. A refrigerant discharge pipe 96 is inserted and connected to the other opening formed above the communication pipe 104.

  Further, the lower end of the space portion 102 has a substantially conical shape that gradually narrows toward the pore 108, and the lower end of the pore 108 opens toward the oil sump 13 formed at the bottom of the sealed container 12. doing.

  The oil separation mechanism 100 is attached to the outer surface of the upper support member 54 by screwing with a screw (not shown) from the sealed container 12 side toward the rotary shaft 16 side.

  Next, the operation of the above configuration will be described. When the stator coil 28 of the electric element 14 is energized through the terminal 20 and a wiring (not shown), the electric element 14 is activated and the rotor 24 rotates. By this rotation, the upper and lower rollers 46 and 48 fitted to the upper and lower eccentric portions 42 and 44 provided integrally with the rotary shaft 16 are eccentrically rotated in the upper and lower cylinders 38 and 40 as described above.

  As a result, the low-pressure refrigerant gas sucked into the low-pressure chamber side of the lower cylinder 40 from the suction port (not shown) via the suction passage 60 formed in the refrigerant introduction pipe 94 and the lower support member 56 becomes the roller 48 and the vane 52. The intermediate pressure is compressed by the above operation to become an intermediate pressure, from the discharge port (not shown) from the high pressure chamber side of the lower cylinder 40, from the discharge silencer chamber 64 formed in the lower support member 56, from the intermediate discharge pipe 121 through the communication passage (not shown). It is discharged inside. Thereby, the inside of the sealed container 12 becomes an intermediate pressure.

  Then, the intermediate-pressure refrigerant gas in the sealed container 12 exits from the sleeve 144, passes through a suction passage 58 formed in the refrigerant introduction pipe 92 and the upper support member 54, and passes from a suction port (not shown) to the low pressure chamber of the upper cylinder 38. Inhaled to the side. The suctioned intermediate-pressure refrigerant gas is compressed in the second stage by the operation of the roller 46 and the vane 50 to become a high-temperature / high-pressure refrigerant gas, which is formed on the upper support member 54 from the high-pressure chamber side through a discharge port (not shown). The discharged muffler chamber 62 is discharged. The refrigerant discharged into the discharge silencer chamber 62 is discharged from the communication hole 106 of the oil separation mechanism 100 into the space 102 through the communication path 63. At this time, the refrigerant gas and the oil mixed in the refrigerant gas are discharged from the communication hole 106 toward the outer wall surface of the distal end portion 104A of the communication pipe 104 in the space 102 as shown by an arrow in FIG. The refrigerant gas and oil move down the space portion 102 while spirally moving around the gap formed between the outer wall surface of the tip portion 104A and the inner peripheral surface of the space portion 102 due to the momentum at the time of discharge.

  In this process, oil mixed in the refrigerant gas is centrifuged from the refrigerant gas, adheres to the outer wall surface and the like of the space portion 102, travels along the outer wall surface, and is formed on the lower side of the space portion 102. From there, it is returned to the oil sump at the bottom of the sealed container 12.

  Thus, the oil mixed in the refrigerant gas compressed by the second rotary compression element 34 is centrifuged by the oil separation mechanism 100 to effectively separate the oil mixed in the refrigerant gas. it can.

  Thereby, since the oil discharge amount discharged from the compressor 10 can be remarkably reduced, the disadvantage that the compressor 10 becomes short of oil and the disadvantage that adversely affects the refrigerant circuit can be avoided. .

  In addition, since the oil separation mechanism 100 is provided in the space between the hermetic container 12 and the rotary compression mechanism unit 18, the enlargement of the compressor 10 due to the installation of the oil separation mechanism 100 can be prevented. .

  Furthermore, by providing the oil separation mechanism 100 in the sealed container 12 of the compressor 10, it is possible to prevent an increase in the size of the refrigerant circuit including the compressor 10 and contribute to the downsizing of the device.

  Furthermore, the oil separation mechanism 100 is attached to the outer surface of the upper support member 54 in which the discharge silencer chamber 62 of the second rotary compression element 34 is formed, so that the oil separation mechanism 100 is compressed by the second rotary compression element 34 and discharged to the discharge silencer chamber 62. It is possible to minimize the path for the refrigerant to enter the oil separation mechanism 100, and to minimize the design change of the rotary compressor 10. Thereby, the increase in production cost can be suppressed as much as possible.

  In this embodiment, the vertical rotary compressor has been described by using the two-stage compression type vertical rotary compressor including the first and second rotary compression elements 32 and 34. However, the present invention is not limited to this. In the case of No. 1, it is effective to apply a single-cylinder vertical rotary compressor, an internal high-pressure rotary compressor, or a rotary compression element to a multistage compression rotary compressor having three, four, or more rotary compression elements. Further, the invention of claim 3 may be a vertical rotary compressor with internal intermediate pressure having two or more rotary compression elements.

  In the present embodiment, the oil separated by the oil separation mechanism 100 is returned to the oil reservoir in the hermetic container 12, but not limited to this, the oil is returned to the sliding portion of the rotary compression mechanism 18 or the like. It doesn't matter.

It is a longitudinal cross-sectional view of the vertical rotary compressor of this invention. It is a figure which shows the flow of the refrigerant gas in an oil separation mechanism.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Rotary compressor 12 Airtight container 14 Electric element 16 Rotating shaft 18 Rotation compression mechanism part 22 Stator 24 Rotor 28 Stator coil 32 1st rotation compression element 34 2nd rotation compression element 38, 40 Cylinders 42, 44 Eccentric part 46, 48 Roller 50, 52 Vane 54 Upper support member 56 Lower support member 62, 64 Discharge silencer chamber 92, 94 Refrigerant introduction tube 96 Refrigerant discharge tube 100 Oil separation mechanism 102 Space portion 104 Communication tube 104A Tip portion 106 Communication hole 108 Pore 141, 142, 143, 144 sleeve

Claims (2)

In a vertical rotary compressor in which a driving element and a rotary compression mechanism unit driven by the driving element are housed in an airtight container,
A vertical rotary compressor characterized in that an oil separation means for centrifuging oil in the refrigerant compressed and discharged by the rotary compression mechanism is provided in the sealed container.   2. The vertical rotary compressor according to claim 1, wherein the oil separation means is provided in the space between the sealed container and the rotary compression mechanism near the rotary compression mechanism.

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