JPH0712707Y2 - Rotary compressor - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a rotary compressor, and in particular, to the oil level of lubricating oil in an oil sump provided in the lower part of the discharge space inside the enclosure for enclosing the compressor body. The present invention relates to a rotary compressor capable of effectively separating lubricating oil in a fluid to be pumped while reducing fluctuation.

[Prior Art] Rotary compressors include those of a rolling piston type, a slide vane type, a turbo type, etc., and a working chamber for sucking and pumping fluid by a rotating body of a rotary partitioning mechanism is formed in the compressor body. In order to lubricate each part of the compressor, a discharge space for the fluid that is pressure-fed from the working chamber is formed in the enclosure that encloses the compressor body, and an oil reservoir for lubricating oil is provided below this discharge space. There is.

For example, in a rolling piston type rotary compressor used in a vehicle air conditioning compressor or the like, a rolling piston incorporated in a cylinder is provided in a cylinder inner wall and a vane which is a partitioning body of a rotary partitioning mechanism capable of appearing and retracting in the cylinder. Fluid that is pressure-fed from the working chamber into a shell, which is an encapsulating body that encloses the cylinder, in order to lubricate each part by partitioning and forming the working chamber that sucks the refrigerant gas that is a fluid by rotating eccentrically while contacting The discharge space is formed, and an oil reservoir for lubricating oil is provided below the discharge space (JP-A-59-231191).

[Problems to be Solved by the Invention] By the way, the refrigerant gas, which is a high-temperature and high-pressure fluid pumped from the working chamber, is discharged into the discharge space in the shell together with the lubricating oil. If this refrigerant gas, which is a high-temperature, high-pressure fluid, is discharged toward the oil surface of the lubricating oil in the oil reservoir provided in the lower part of the discharge space, the oil surface fluctuates, the amount of lubrication increases, and the capacity of the compressor decreases. There is. Further, when the refrigerant gas mixed with the lubricating oil that is pressure-fed from the working chamber is supplied to the air conditioner, there is a disadvantage that the lubricating oil adheres to the condenser and the evaporator to deteriorate the heat transfer and deteriorate the heat exchange capacity.

Therefore, conventionally, a wire mesh-like demister is provided facing the end opening of the discharge passage that opens in the working chamber to prevent the refrigerant gas from being directly discharged in the oil level direction and separate the lubricating oil in the refrigerant gas. By doing so, the fluctuation of the oil level is reduced and the deterioration of the heat exchange capacity is prevented.

However, conventionally, since the end opening of the discharge passage is provided without considering the directivity direction, it is not possible to reliably prevent the refrigerant gas discharged into the discharge space from being discharged toward the oil surface of the lubricating oil. Therefore, there is an inconvenience that the oil level fluctuation cannot be reduced. Further, the conventional wire mesh demister has a disadvantage that it is not possible to sufficiently separate the lubricating oil in the refrigerant gas.

[Purpose of Invention] Therefore, the purpose of this invention is to eliminate the above-mentioned inconveniences.
A discharge passage communicating with the working chamber of the compressor main body, a separation mechanism having a swirl chamber for separating lubricating oil in the fluid pumped through the discharge passage, and a discharge mechanism communicating with the working chamber are provided. It is composed of a discharge passage and a second discharge passage in a lower part of the swirl chamber, which is directed substantially tangentially and upward in the swirl chamber. A discharge valve is provided between the first discharge passage and the second discharge passage, and a fluid is provided above the swirl chamber. Is provided with a fluid drain hole for discharging the oil, and a first oil drain passage that is directed vertically downward at a substantially central portion of the lower portion of the swirl chamber to drain the lubricating oil separated in the swirl chamber and the first oil drain passage communicates with the first oil drain passage. By providing the oil drain passage including the second oil drain passage that is oriented horizontally toward the body side wall surface, the fluid containing the lubricating oil is caused to flow upward to effectively separate the lubricating oil in the swirling chamber. And high temperature / high pressure fluid in the swirling chamber Effect to prevent giving the oil reservoir provided in the discharge space under a reduced oil level fluctuations of the lubricating oil, also
A rotation that can separate the compression side where the working chamber exists from the separation side where the separation mechanism exists by the discharge valve and prevent them from being affected by each other, and further prevent the reverse flow of gas etc. from the separation side to the compression side. The realization of a compressor.

[Means for Solving the Problems] In order to achieve this object, the present invention defines a working chamber for sucking and pumping a fluid by a rotary partitioning mechanism, and partitions the working chamber into the compressor main body while enclosing the compressor main body. A discharge passage communicating with the working chamber of the compressor body in a rotary compressor in which a discharge space for the fluid to be pressure-fed from the working chamber is formed in the encapsulation body, and an oil reservoir for lubricating oil is provided under the discharge space. And a separation mechanism having a swirl chamber for separating the lubricating oil in the fluid pressure-fed through the discharge passage, and the first discharge passage communicating the discharge passage with the working chamber and the lower portion of the swirl chamber. A fluid discharge device configured to include a second discharge passage that is directed substantially upward and substantially tangentially to the swirl chamber, and a discharge valve is provided between the first discharge passage and the second discharge passage to discharge fluid to the upper portion of the swirl chamber. A hole is provided and separated in the swirl chamber. The first oil drain passage which is directed vertically downward at a substantially central portion of the lower portion of the swirl chamber in order to drain the collected lubricating oil, and the first oil drain passage which communicates with the first oil drain passage and is horizontally directed toward the side wall surface of the envelope. An oil drain passage including a second oil drain passage is provided.

[Operation] According to the configuration of the present invention, the fluid containing the lubricating oil pumped from the working chamber of the compressor body is directed through the second discharge passage below the swirl chamber in a direction substantially tangential to and above the swirl chamber. Since it is provided with the end opening, the lubricating oil in the fluid flows downward due to the effect of gravity in the upwardly directed second discharge passage, and the fluid easily flows upward in the swirling chamber, so that the fluid and the lubricating oil And the fluid generates a swirling flow along the inner wall surface of the swirling chamber, whereby the lubricating oil having a large specific gravity abuts against the inner wall surface and is separated. The lubricating oil that has flowed down the inner wall surface naturally flows back to the oil reservoir through the lower oil drain passage bent by the first and second oil drain passages,
As a result, the separated lubricating oil can be guided to the oil surface without being affected by the high temperature and high pressure fluid in the swirling chamber.
On the other hand, the fluid in the swirl chamber flows out to the discharge space through the fluid drain hole in the upper portion. Therefore, it is possible to effectively separate the lubricating oil in the fluid to be pumped while reducing the oil level fluctuation of the lubricating oil in the oil reservoir provided in the lower portion of the discharge space inside the envelope.

As a result, the lubricating amount of the lubricating oil is reduced, the function of the compressor is fully exerted, and the cooling capacity is improved. The discharge valve divides the compression side where the working chamber exists and the separation side where the separation mechanism exists to prevent them from being affected by each other.
It is possible to prevent backflow of gas or the like from the separation side to the compression side.

[Embodiment] An embodiment of the present invention will be described in detail and specifically with reference to the drawings.

1 to 4 show an embodiment of the present invention. In the figure, 2 is a rotary type, so-called rolling piston type compressor (hereinafter simply referred to as "compressor"). This compressor 2
Is a cylinder 4, a rolling piston 6 that is a rotating body of a rotation partitioning mechanism provided in the cylinder 4, a crankshaft 8 that is provided to have the same rotation center as the rotation center of the cylinder 4, and the rolling. Outer peripheral surface 6a of piston 6
The vane springs 10, 10
And a vane 12 which is a partition of a rotary partition mechanism which is urged by the rotary partition mechanism and is capable of projecting and retracting in the cylinder 4. A front housing 14 and a rear housing 16 are attached to both axial side surfaces of the cylinder 4, and the crankshaft 8 can be rotated in the cylinder 4 by inserting these front and rear housings 14 and 16 therethrough. An electromagnetic clutch mechanism 18 for connecting and disconnecting the rotational force is provided at the outer end of the crankshaft 8 on the front housing 14 side, and is covered with a shell 20 which is an envelope from the rear housing 16 side. It is provided. As a result, the compressor 2 drives the crankshaft 8 in the rotation R direction to eccentrically rotate the outer peripheral surface 6a of the rolling piston 6 while contacting the inner wall surface 4a of the cylinder 4 and the tip portion 12a of the vane 12. When the vane 12 appears and disappears, two working chambers, that is, a suction-side working chamber 22 and a discharge-side working chamber 24 are formed, and the refrigerant gas as a fluid is sucked and compressed.

The cylinder 4 has a suction hole communicating with the suction side working chamber 22.
A suction passage that forms 26 and communicates with this suction hole 26.
Forming 28. The suction passage 28 communicates with a suction port 32 of a suction portion 30 provided in the front housing 14.

At the bottom of the discharge space 34 in the shell 20, an oil reservoir for lubricating oil is provided.
36 are provided. The lubricating oil in the oil sump 36 is sucked from the oil suction port 38 provided in the rear housing 16 by the differential pressure when sucking and pumping the refrigerant gas, and is supplied to each part of the compressor 2.

A discharge passage 40 communicates with the discharge-side working chamber 24. The discharge passage 40 includes a first discharge passage 40-1 and a second discharge passage 40-2. A discharge valve 44, which is a reed valve supported by a support 42, is provided between the first discharge passage 40-1 and the second discharge passage 40-2. The discharge valve 44 allows the flow of the refrigerant gas from the discharge side working chamber 24.

One end side of the first discharge passage 40-1 communicates with the lower part of the discharge side working chamber 24, and the discharge valve 44 continuously connects with the other end side of the first discharge passage 40-1.

In the second discharge passage 40-2, a discharge valve 44 is continuously provided on one end side, and the other end side is oriented in the lower part of the swirl chamber 50 in a substantially tangential direction of the swirl chamber 50 and upward, and a final opening portion thereof is formed. It is located above the small number. That is, this second discharge passage 40-2
The final opening portion of is communicated with the lower portion of the separating mechanism 46.

Therefore, the discharge passage 40 is arranged such that the final opening portion communicating with the lower portion of the separation mechanism 46 is located above the starting end opening communicating with the discharge side working chamber 24. In this embodiment, the center line C of the second discharge passage 40-2 forms an angle α (α
(= 10 to 30 degrees) is arranged so as to be inclined upward.

As shown in FIGS. 3 and 4, the separation mechanism 46 includes a swirl chamber 50 formed by a chamber wall 48, a fluid drain hole 52 formed in the upper part of the swirl chamber 50, and a lower part formed in an inverted conical shape. The oil drain passage 56 is formed at a substantially central portion of the bottom portion 54, and the demister 58 is disposed in the fluid drain hole 52. The demister 58 separates the lubricating oil that has not been separated in the swirl chamber 50. In addition, the oil drain hole 56 communicates with a first oil drain hole 56-1 formed vertically downward at a substantially central portion of the bottom portion 54, and communicates with the first oil drain hole 56-1 so as to direct in the horizontal direction and discharge the oil. It is composed of a second oil drain hole 56-2 opened in the side space 34a of the space 34 and is bent. That is, the second oil drain hole 56-2 is directed toward the side wall surface 20a of the shell 20, and guides the lubricating oil from the first oil drain hole 56-1 side to the side space 34a on the side wall surface 20a side.

Further, as shown in FIG. 4, the end opening of the second discharge passage 40-2 is directed substantially upward in the tangential direction of the swirl chamber 50 and is directed upward.
It is distributed in 50. As a result, the discharge passage 40
The refrigerant gas from the above generates a swirling flow upward along the inner wall surface 48a of the chamber wall 48.

Further, the shell 20 is provided with a discharge portion 62 having a discharge port 60 for discharging the refrigerant gas flowing out from the fluid discharge hole 52 of the separation mechanism 46 to the discharge space 34 to the outside.

Next, the operation of this embodiment will be described.

The compressor 2 rotates the crankshaft 8 to drive the rolling piston 6, and the outer peripheral surface 6 a of the rolling piston 6
Eccentrically rotates while always in contact with the inner wall surface 4a of the cylinder 4.
At this time, in the cylinder 4, a suction side working chamber 22 and a discharge side working chamber 24 are formed, which are partitioned by the vane 12 protruding and retracted and the rolling piston 6. Then, due to the eccentric rotation of the rolling piston 6, the volume of the suction side working chamber 22 and the volume of the discharge side working chamber 24 are alternately changed in the order of large → medium → 0 → large → medium. Then, the suction hole 26 is located on the side where the volume gradually increases, and conversely, the first discharge passage 56-1 is located on the side where the volume decreases, so that one revolution of the crankshaft 8 causes
Complete one cycle of inhalation / compression. Therefore, the refrigerant gas flowing into the suction side working chamber 22 through the suction port 32, the suction passage 28, and the suction hole 26 is discharged to the discharge passage 40 by the compression action of the rolling piston 6. At this time, lubricating oil that lubricates the crankshaft 8 and the like is mixed in the refrigerant gas.

The mixed fluid in which the refrigerant gas and the lubricating oil are mixed flows into the swirl chamber 50 through the first discharge passage 40-1, the discharge valve 44, and the second discharge passage 40-2. At this time, due to the presence of the discharge valve 44, the working chamber 24
Of the swirl chamber 50 and the compression side where the separation mechanism 46 is present and the separation side where the separation mechanism 46 is present are prevented from being separated from each other and affecting each other.
It is possible to prevent backflow of gas or the like from the side to the working chamber 24 side.

The above-mentioned mixed fluid flows from the lower part of the swirl chamber 50, and the chamber wall 48
A swirl flow is generated upward along the inner wall surface 48a of the. Further, at this time, since the refrigerant gas containing the lubricating oil is discharged upward into the swirl chamber 50, the lubricating oil in the refrigerant gas is separated downward due to the effect of gravity in the second discharge passage 40-2. The refrigerant gas separated in the swirl chamber 50 can easily flow upward through the fluid vent hole 52, and the lubricating oil can be temporarily retained in the bottom portion 54. Further, since the separated lubricating oil has a large specific gravity, it flows down along the inner wall surface 48a of the chamber wall 48 and gradually flows out to the side space 34a of the discharge space 34 through the bent oil drain passage 56. At this time, since the second oil removal passage 56-2 is positioned in the horizontal direction, the lubricating oil from the swirl chamber 50 side naturally flows out to the side space 34a. As a result, the separated lubricating oil can be guided to the oil reservoir without being affected by the high-temperature, high-pressure refrigerant gas in the swirl chamber 50.

On the other hand, in the swirl chamber 50, the refrigerant gas flows into the discharge space 34 through the fluid vent hole 52 provided in the upper part of the swirl chamber 50. At this time, the lubricating oil in the refrigerant gas is separated by the demister 58 and flows down. As a result, only the refrigerant gas can flow out into the discharge space 34.
The refrigerant gas therein is supplied to a desired site through the discharge port 60.

As a result, the mixed fluid of the refrigerant gas and the lubricating oil discharged from the discharge side working chamber 24 is directed upward and reaches the swirl chamber 50.
Since the discharge passage 40-2 and the separating mechanism 46 effectively and reliably separate the lubricant, the lubricant oil is prevented from flowing out to the upper side of the discharge space 34. At this time, the presence of the discharge valve 44 prevents the compression side where the working chamber 24 is present and the separation side where the separation mechanism 46 is present from being separated from each other and affecting each other, and also from the swirl chamber 50 side to the working chamber. It is possible to prevent backflow of gas or the like to the 24 side.

Further, when the refrigerant gas and the lubricating oil are separated, the refrigerant gas is caused to flow out to the upper side of the discharge space 34, the lubricating oil is temporarily retained at the bottom portion 54, and is horizontally oriented. 2 Because it gradually flows out naturally through the oil drain passage 56-2, fluctuations in the oil level of the lubricating oil in the oil sump 36 are avoided as much as possible, and the high temperature and high pressure refrigerant gas in the swirl chamber 50 is also affected. Instead, the separated lubricating oil can be guided to the oil sump. Therefore, the circulation amount of the lubricating oil is reduced, the function of the compressor 2 is fully exerted, and the cooling capacity is improved.

[Effect of the Invention] As is apparent from the above detailed description, according to the present invention,
A discharge passage communicating with the working chamber of the compressor body is provided, and a separation mechanism having a swirl chamber is provided to separate the lubricating oil in the fluid pumped through the discharge passage, and the first discharge communicating the discharge passage with the working chamber. The passage is composed of a passage and a second discharge passage at a lower part of the swirl chamber and directed substantially tangentially upward of the swirl chamber. A discharge valve is provided between the first discharge passage and the second discharge passage, and a fluid is provided in an upper part of the swirl chamber. A fluid drain hole is provided to flow out, and a first oil drain passage that is vertically downwardly directed at a substantially central portion of the lower portion of the swirl chamber to communicate with the first oil drain passage in order to drain the lubricating oil separated in the swirl chamber. By providing the oil drain passage including the second oil drain passage that is oriented horizontally toward the wall surface, the mixed fluid is caused to flow upward to effectively separate the lubricating oil in the swirl chamber and swirl. Discharge space affected by high temperature and high pressure fluid in the room To prevent giving the oil reservoir provided in the section may reduce the oil level fluctuations of the lubricating oil in the oil reservoir.

In addition, the presence of the discharge valve divides the compression side where the working chamber exists from the separation side where the separation mechanism exists so as to prevent them from being affected by each other, and further prevents the reverse flow of gas or the like from the separation side to the compression side. Can be prevented.

Further, the lubricating oil separated in the swirl chamber is temporarily retained at the bottom of the swirl chamber, and this lubricating oil can be gradually flowed down from the oil drain passage.

[Brief description of drawings]

1 to 4 show an embodiment of the present invention, FIG. 1 is a partially cutaway sectional view of a rotary compressor, FIG. 2 is an inner end surface portion of the rotary compressor, and FIG. 3 is FIG. FIG. 4 is an enlarged view of an essential part of FIG. 4, and FIG. 4 is a schematic plan view of the separating mechanism. In the figure, 2 is a compressor, 4 is a cylinder, 6 is a rolling piston, 8 is a crankshaft, 12 is a vane, 20 is a shell, 22 is a suction side working chamber, 24 is a discharge side working chamber, 28 is a suction passage, 34 Is a discharge space, 36 is an oil reservoir, 40 is a discharge passage, 46 is a separation mechanism, 50 is a swirl chamber, 52 is a fluid drain hole, 56 is an oil drain passage,
58 is the demister, and H is the horizon.

Claims (1)

[Scope of utility model registration request] 1. A discharge space for a fluid to be pumped from the working chamber, wherein a working chamber for sucking and pumping the fluid by a rotary partitioning mechanism is partitioned and formed in the compressor body, and is enclosed in an enclosure that encloses the compressor body. In the rotary compressor in which the oil reservoir for lubricating oil is provided under the discharge space, a discharge passage communicating with the working chamber of the compressor body is provided, and the lubricating oil in the fluid pumped through the discharge passage is formed. A separation mechanism having a swirl chamber for separating the swirl chamber, a first discharge passage communicating the discharge passage with the working chamber, and a second discharge passage directed downward and substantially tangential to the swirl chamber in the lower portion of the swirl chamber. Consisting of the first
A discharge valve is provided between the discharge passage and the second discharge passage, a fluid drain hole is provided in the upper portion of the swirl chamber for discharging a fluid, and a substantially central portion of the lower portion of the swirl chamber for draining the lubricating oil separated in the swirl chamber. An oil drain passage including a first oil drain passage directed vertically downward at a part and a second oil drain passage communicating with the first oil drain passage and horizontally directed toward the side wall surface of the envelope body is provided. A rotary compressor characterized by the above.