JP6440927B2 - Hermetic scroll compressor - Google Patents

Description

  The present invention relates to a hermetic scroll compressor in which an oil separation mechanism is built in a discharge cover.

  A hermetic scroll compressor is known in which a discharge cover is provided on the back side of a fixed scroll member provided with a discharge port to form an oil separation chamber, and an oil separation mechanism is provided therein (Patent Document). 1). The oil separation mechanism includes a partition member that divides the oil separation chamber into an inner gas discharge chamber including a discharge port and a discharge valve installation region, and an outer oil reservoir chamber, and an upper portion of the partition member. The plate member is closed and has an upper surface provided with a plate member having a blow-out port for blowing compressed gas from the gas discharge chamber into the oil separation chamber.

  The oil separation mechanism is a cyclone type oil separation mechanism in which the outlet provided on the upper surface of the plate member is opened along the circumferential direction at an eccentric position so as to give a swirl flow to the compressed gas. The oil separated by centrifugal force in the upper oil separation chamber is once accumulated in the lower oil sump chamber, and then returned by a predetermined amount to the oil sump in the housing.

  On the other hand, in Patent Document 2, an oil separation chamber is formed on the outside by a separation cover so as to communicate with a compressed gas discharge chamber, and a mesh-like substance is accommodated along the inner peripheral surface of the oil separation chamber. Then, a swirl flow is given to the compressed gas flowing out from the discharge chamber to the oil separation chamber by the outlet, and the oil contained in the compressed gas is separated by colliding with the mesh-like substance by centrifugal force. ing. In this oil separation mechanism, the compressed gas from which oil has been separated is discharged into the housing from the upper surface of the oil separation chamber, and the separated oil is allowed to flow into the housing from the lower outer periphery of the oil separation chamber.

JP 2009-180106 A JP-A-4-134196

  In the above-mentioned Patent Document 1, the oil separated in the oil separation chamber is temporarily stored in the lower oil reservoir and returned to the oil reservoir in the housing by a predetermined amount, but the oil is stored in the oil reservoir. There is a risk that the oil that has been swelled or rolled up by the compressed gas flow and discharged to the outside of the compressor together with the compressed gas. As a result, the oil separation efficiency is reduced, and the oil circulation rate is increased due to an increase in oil flow from the compressor, resulting in deterioration of heat exchange efficiency in the refrigeration cycle. In particular, the oil separation chamber and the oil sump chamber have not been able to sufficiently suppress oil rising because the volume cannot be sufficiently secured due to space constraints.

  On the other hand, Patent Document 2 discloses a technique in which a net-like substance is filled in an oil separation chamber in order to increase oil separation efficiency, and the oil is separated by colliding with compressed gas using centrifugal force. However, this does not include an oil sump chamber in which the separated oil is stored. Therefore, the oil stored in the oil sump chamber is wound up by the compressed gas flow, and the outside of the compressor together with the compressed gas. It did not have the subject that it was discharged to.

  The present invention has been made in view of such circumstances, and includes an oil separation mechanism having an oil sump chamber, and prevents oil separation by preventing the oil in the sump chamber from being rolled up by a compressed gas flow. An object of the present invention is to provide a hermetic scroll compressor that can increase efficiency and reliably suppress oil rising.

In order to solve the above-described problems, the hermetic scroll compressor of the present invention employs the following means.
That is, the hermetic scroll compressor according to the present invention includes a discharge cover installed on the back side of the fixed scroll member provided with the discharge port, and an oil provided inside the oil separation chamber formed by the discharge cover. In the hermetic scroll compressor having a separation mechanism , the oil separation mechanism includes a partition member that partitions the oil separation chamber into a gas discharge chamber on the inner peripheral side and an oil reservoir chamber on the outer peripheral side, and the partition member A plate member installed on the upper surface of the gas pipe, and the plate member has a blowout port for blowing compressed gas from the gas discharge chamber to a space in the oil separation chamber above the plate member , The oil sump chamber formed on the outer periphery of the partition member is filled with a hoisting prevention member that holds the oil separated in the oil separation chamber and prevents the oil from rolling up. And wherein the are.

  According to the present invention, when the compressed gas is blown out from the gas discharge chamber partitioned by the partition member into the oil separation chamber through the outlet provided on the upper surface of the plate member, a swirl flow is given to the compressed gas. The oil in the compressed gas is separated in the oil separation chamber, and the oil is collected in the oil reservoir chamber formed in the outer periphery of the partition member, that is, in the lower region of the oil separation chamber, and the oil reservoir in the housing is stored by a predetermined amount from there. On the other hand, the oil sump chamber is filled with a hoisting prevention member that prevents the accumulated oil from being rolled up by the compressed gas flow, so that the oil once separated is wound up by the compressed gas flow, The oil rising phenomenon discharged to the outside together with the compressed gas can be effectively suppressed. Therefore, the oil separation efficiency provided by the oil separation mechanism provided in the discharge cover can be increased, the oil circulation rate can be reduced by suppressing the oil rising from the compressor, and the heat exchange efficiency in the refrigeration cycle can be increased.

  Further, the hermetic scroll compressor of the present invention is the above-described hermetic scroll compressor, wherein the hoisting prevention member is configured to hold a steel wool material formed in a ring shape by a cylindrical thin plate, and the partition It is accommodated and installed in the annular oil reservoir chamber formed on the outer periphery of the member.

  According to the present invention, the hoisting prevention member has a structure in which a steel wool material formed in a ring shape is held by a cylindrical thin plate, and is housed and installed in an annular oil sump chamber formed on the outer periphery of the partition member. Therefore, the oil hoisting prevention member is made of a ring-shaped steel wool material held via a cylindrical thin plate, and is housed in an annular oil sump chamber so that the hoisting prevention member is placed in the oil sump chamber. And can be filled in a simple and maintained state. Therefore, the rolling-up preventing member made of the steel wool material can effectively and stably prevent the oil from being rolled up by the compressed gas flow, and the oil separation efficiency can be reliably suppressed by increasing the oil separation efficiency.

  Furthermore, the hermetic scroll compressor according to the present invention is any one of the above-described hermetic scroll compressors, wherein the hoisting prevention member is filled in the entire area of the oil sump chamber to prevent the accumulated oil from wavy and hoisting. It is characterized by being configured.

  According to the present invention, since the hoisting prevention member is filled in the entire area of the oil sump chamber and is configured to prevent the accumulated oil from waving and hoisting, the hoisting prevention member filled in the entire area of the oil sump chamber is used. In addition, it is possible to prevent the oil from waving and rolling up due to the compressed gas flow blowing through the surface of the oil accumulated in the oil sump chamber. Therefore, it is possible to reliably prevent the oil that has been separated in the oil separation chamber and accumulated in the oil reservoir chamber from being compressed by the compressed gas flow, and to suppress oil rising by increasing the oil separation efficiency.

  Furthermore, the hermetic scroll compressor according to the present invention is the above-described hermetic scroll compressor, wherein the oil from the compressed gas flows along the inner peripheral surface above the plate member in the oil separation chamber. An oil separation accelerating member is provided that promotes separation and re-separates the oil wound up from the oil sump chamber.

  According to the present invention, the oil separation that promotes the separation of the oil from the compressed gas along the inner peripheral surface above the plate member in the oil separation chamber and re-separates the oil wound up from the oil sump chamber. Since the accelerating member is provided, the compressed gas blown from the gas discharge chamber into the oil separation chamber through the blowout port provided in the plate member is provided along the inner peripheral surface of the oil separation chamber. Oil separation can be promoted, for example, by colliding with a separation promoting member, and the separated oil can be stored in a lower oil reservoir chamber and then returned to the oil reservoir in the housing. On the other hand, even if the oil stored in the oil sump chamber is wound up by the compressed gas flow, it is separated again by the oil separation promoting member provided on the inner peripheral surface of the upper oil separation chamber to prevent the oil from rolling up. It is possible to return to the oil sump chamber filled with the member. Therefore, the oil separation efficiency is further improved by the synergistic effect of the oil separation promoting member provided on the inner peripheral surface of the oil separation chamber and the hoisting prevention member filled in the oil reservoir chamber, and the oil rise is greatly reduced. can do.

  Further, in the hermetic scroll compressor according to the present invention, in the hermetic scroll compressor, the oil separation promoting member is provided with a steel wool material formed in a ring shape at a plurality of locations on the outer periphery of the plate member. It is configured to be held through a thin plate piece, and is housed and installed on the inner peripheral surface of the oil separation chamber formed by the discharge cover.

  According to the present invention, the oil separation promoting member is configured to hold a steel wool material formed in a ring shape via thin plate pieces provided at a plurality of locations on the outer periphery of the plate member, and is formed of a discharge cover. Since the oil separation promoting member is accommodated and installed on the inner peripheral surface of the oil separation chamber, the oil separation promoting member is constituted by a ring-shaped steel wool material held via a plurality of thin plate pieces provided on the plate member, and By accommodating and installing the oil on the inner peripheral surface of the oil separation chamber, the oil separation promoting member can be easily and well installed on the inner peripheral surface of the oil separation chamber while maintaining a predetermined shape. Therefore, the oil separation promoting member made of steel wool material effectively and stably promotes the separation of oil contained in the compressed gas and the re-separation of the oil wound up from the oil reservoir chamber, thereby improving the oil separation efficiency. Therefore, it is possible to reliably suppress oil rising.

  According to the present invention, the oil contained in the compressed gas is separated in the oil separation chamber, and the oil is stored in the oil sump chamber formed in the lower region, and then returned to the oil sump in the housing by a predetermined amount. On the other hand, since the hoisting prevention member for preventing the accumulated oil from being rolled up by the compressed gas flow is filled in the oil sump chamber, the oil once separated is wound up by the compressed gas flow, and the compressed oil is discharged outside together with the compressed gas. The discharged oil phenomenon can be effectively suppressed. Therefore, the oil separation efficiency provided by the oil separation mechanism provided in the discharge cover can be increased, the oil circulation rate can be reduced by suppressing the oil rising from the compressor, and the heat exchange efficiency in the refrigeration cycle can be increased.

It is a longitudinal cross-sectional view of the example which applied the hermetic scroll compressor concerning one Embodiment of this invention to a multistage compressor. FIG. 2 is an enlarged longitudinal sectional view of a main part of the hermetic scroll compressor shown in FIG. 1. It is an AA cross-section equivalent figure (A) in FIG. 2, and its longitudinal cross-section equivalent figure (B). FIG. 3 is a cross-sectional view equivalent to BB in FIG. 2 (A) and a vertical cross-sectional view (B) thereof.

An embodiment according to the present invention will be described below with reference to FIGS.
FIG. 1 shows a longitudinal sectional view of an example in which a hermetic scroll compressor according to an embodiment of the present invention is applied to a hermetic multistage compressor for refrigeration and air conditioning, and FIG. 2 shows the hermetic scroll compression. An enlarged longitudinal section of the main part of the machine is shown.
In the present embodiment, for the sake of convenience, the present embodiment is based on an example applied to a hermetic multistage compressor (multistage compressor) 1 configured using a rotary compressor 2 on the lower stage side and a scroll compressor 3 on the higher stage side. A sealed scroll compressor 3 according to an embodiment of the present invention will be described. The present invention is a single-stage sealed scroll compressor, or a sealed type in which both the low-stage side and the high-stage side are sealed scroll compressors. Needless to say, the present invention can also be applied to a multistage scroll compressor.

  A multistage compressor 1 using a hermetic scroll compressor (scroll compressor) 3 includes a hermetic housing (housing) 10. The hermetic housing 10 includes a cylindrical center housing 10A, a bearing bracket 11 provided by welding all around the center housing 10A, a lower housing 10B that seals the lower portion of the center housing 10A, and an upper portion of the bearing bracket 11. And an upper housing 10C for sealing the upper portion of the center housing 10A.

  An electric motor 4 including a stator 5 and a rotor 6 is fixedly installed at a substantially central portion in the center housing 10A. A rotating shaft (crankshaft) 7 is integrally coupled to the rotor 6. A low-stage rotary compressor 2 is installed below the electric motor 4. The low-stage rotary compressor 2 includes a cylinder chamber 20, is fixedly installed in the center housing 10 </ b> A, is fixedly installed above and below the cylinder body 21, and seals the upper and lower portions of the cylinder chamber 20. An upper bearing 22 and a lower bearing 23, a rotor 24 that is fitted to the crank portion 7A of the rotary shaft 7 and rotates on the inner peripheral surface of the cylinder chamber 20, and the inside of the cylinder chamber 20 is divided into a suction side and a discharge side. The configuration includes an omitted blade, a blade pressing spring, and the like.

  The rotary compressor 2 sucks a low-pressure refrigerant gas into the cylinder chamber 20 through the suction pipe 25 and compresses the refrigerant gas to an intermediate pressure by the rotation of the rotor 24, and then the upper bearing 22 and the lower bearing 23. Are discharged into discharge chambers 26 and 27 formed vertically, and merged in the discharge chamber 26, and then discharged into the center housing 10A. This intermediate-pressure refrigerant gas flows through a gas passage hole provided in the rotor 6 of the electric motor 4 and is guided to the upper space of the electric motor 4 and further sucked into the scroll compressor 3 on the higher stage side. It is designed to be compressed in two stages.

  The high-stage scroll compressor 3 is provided in the upper housing 10C. The scroll compressor 3 is provided with a bearing 30 that supports a rotating shaft (crankshaft) 7, and a bearing member 31 (also referred to as a frame member or a supporting member) that is fixedly installed on the upper surface of the bearing bracket 11 via bolts 12. And the spiral wraps 32B and 33B standing on the end plates 32A and 33A, respectively, and the spiral wraps 32B and 33B are engaged with each other and assembled on the bearing member 31 to constitute a pair of compression chambers 34. A fixed scroll member 32 and an orbiting scroll member 33 are provided.

  The scroll compressor 3 further couples the orbiting scroll member 33 and the eccentric pin 7B of the rotary shaft 7 via the drive bush 13 to rotate the orbiting scroll member 33 in a revolving manner, and the orbiting scroll member 33. A rotation prevention mechanism 35 that is provided between the bearing member 31 and prevents the rotation of the orbiting scroll member 33 to revolve and revolves, and a discharge that is provided on the back side of the fixed scroll member 32 and opens and closes the discharge port 32C. A valve 36 (see FIG. 2) is fixedly installed on the back side of the fixed scroll member 32 so as to surround the discharge valve 36, and is connected to a central portion of the discharge cover 38, which forms an oil separation chamber 37. , Installed in the oil separation chamber 37 and the discharge pipe 39 for discharging the compressed high-temperature high-pressure gas to the outside, and separating the oil from the compressed gas It has a configuration that includes a that oil separation mechanism 40.

  The scroll compressor 3 sucks the intermediate-pressure refrigerant gas compressed by the low-stage rotary compressor 2 and discharged into the sealed housing 10 into the compression chamber 34. After being compressed to a higher pressure by a compression operation by revolving turning drive, it is configured to be discharged to the oil separation chamber 37 in the discharge cover 38 via the discharge valve 36. The high-temperature and high-pressure refrigerant gas is sent to the outside of the multistage compressor 1, that is, to the refrigeration cycle side through the discharge pipe 39 after the oil in the gas is separated by the oil separation mechanism 40 in the oil separation chamber 37. It is like that.

  Further, a known positive displacement oil pump 14 is incorporated between the lowermost end of the rotary shaft (crankshaft) 7 and the lower bearing 23 of the low-stage rotary compressor 2. The positive displacement oil pump 14 pumps up the lubricating oil 15 filled in the bottom of the hermetic housing 10, and through bearing holes 16 provided in the rotary shaft 7, the bearing portions of the rotary compressor 2 and the scroll compressor 3. For example, the lubricating oil 15 is forcibly supplied to a required lubricating portion.

Below, the structure of the oil separation mechanism 40 is demonstrated in detail.
As shown in FIGS. 2 to 4, the oil separation mechanism 40 includes a cylindrical oil separation chamber 37 formed by the inner peripheral surface of the discharge cover 38, and together with the discharge cover 38, the fixed scroll member 32. A cylindrical partition member 42 fixedly installed on the back surface via a gasket or the like is provided. The partition member 42 is configured separately from the fixed scroll member 32, has a flange portion 42A at the lower portion, and is fastened to the back surface of the fixed scroll member 32 by a bolt 41 together with the discharge cover 38 via the flange portion 42A. It is fixed.

  As shown in FIG. 2, the partition member 42 is eccentrically arranged in the installation direction of the discharge valve 36 with respect to the cylindrical oil separation chamber 37 formed by the inner peripheral surface of the discharge cover 38, and the oil separation chamber 37, a gas discharge chamber 43 on the inner peripheral side surrounding the discharge port 32C and the discharge valve 36 and an oil reservoir chamber 44 on the outer peripheral side thereof are partitioned. By arranging the partition member 42 eccentrically, the oil sump chamber 44 is formed into an annular space in which the radial width is narrow in the installation direction of the discharge valve 36 and the radial width is widened on the opposite side. The volume of the oil sump chamber 44 can be increased as compared with the case where the partition member 42 is provided concentrically with the discharge cover 38 so as to surround the discharge valve 36.

  A thin plate-like plate member 45 is fixedly installed on the upper surface of the partition member 42 with several bolts. The plate member 45 is concentric with the inner peripheral surface of the discharge cover 38, and is attached so as to cover the upper surface of the oil sump chamber 44 uniformly with a uniform gap of about 1 mm to 2 mm around the periphery. ing. Further, the plate member 45 is provided with a blow-out port 46 for blowing compressed gas from the gas discharge chamber 43 to the oil reservoir chamber 44 side. The blowout port 46 is formed by press-molding a part of the plate member 45 so as to protrude upward in an arc shape and opening one end thereof in a semicircular shape.

  The blow-out port 46 is provided at a position corresponding to the outer peripheral region of the maximum eccentric portion of the partition member 42 arranged eccentrically in the installation direction of the discharge valve 36, that is, the upper left region of the oil sump chamber 44 shown in FIG. As shown in FIG. 3, the discharge cover 38 is opened at a predetermined angle in the tangential direction toward the inner peripheral surface of the discharge cover 38. By opening the outlet 46 in this manner, the compressed gas can be blown out from the outermost peripheral region in the oil reservoir chamber 44 while giving a swirling flow toward the inner peripheral surface of the discharge cover 38.

  Further, when the installation position is set to 0 deg with respect to the blowing port 46, the oil separation mechanism 40 separates the angle θ in the swirling direction of the compressed gas blown from the blowing port 46 to a position where θ = 180 to 360 deg. An oil discharge port 47 is provided for discharging the oil from the oil reservoir chamber 44 to the oil reservoir below the sealed housing 10. The oil discharge port 47 is opened on the inner wall of the discharge cover 38 so as to face the inner peripheral surface thereof, communicates with the oil reservoir chamber 44 and is provided at a position outside the outer periphery. A strainer 48 is disposed in the oil discharge port 47.

  The oil discharge port 47 penetrates through the flange portion 42 </ b> A of the partition member 42, and is a fine groove provided on the surface of the sealing gasket interposed between the back surface of the fixed scroll member 32 and the partition member 42. And so on. The fine groove provided by cutting the surface of the gasket 41 has an appropriate length, and constitutes a decompression mechanism that decompresses the high-pressure oil and returns it to the lower part of the sealed housing 10 by a predetermined amount. To do.

  The other end of the fine groove communicates with an oil drain hole 49 formed in the outer peripheral area of the end plate 32A of the fixed scroll member 32. Further, the oil drain hole 49 is an oil drilled in the bearing member 31. In the drop hole 50, the bearing member 31 is joined to the oil drain hole 51 for discharging the lubricating oil after lubricating the bearing provided in the bearing member 31, and the oil flows downward from the lower end portion thereof. It is configured.

  Furthermore, in the present embodiment, when oil separation in the oil separation chamber 37 is promoted, and the oil separated in the oil separation chamber 37 and stored in the oil sump chamber 44 is wound up by the compressed gas flow In addition, an oil separation promoting member 52 is provided along the inner peripheral surface of the oil separation chamber 37 in the upper portion of the plate member 45 for re-separating it and returning it to the oil sump chamber 44. As shown in FIG. 3, the oil separation promoting member 52 bends and forms a thin plate piece 53 provided at a plurality of outer peripheral locations (three locations) on the plate member 45 with a steel wool material formed into a ring shape. It is set as the structure hold | maintained by this.

  Further, the oil pool chamber 44 is filled with a roll-up preventing member 54 in order to prevent oil waving and rolling-up due to the compressed gas flow blowing through the surface of the accumulated oil. As shown in FIG. 4, the hoisting prevention member 54 is formed into a crescent-shaped ring shape in which the outer periphery and the inner periphery are eccentric so that the steel wool material matches the planar shape of the oil sump chamber 44. It is configured to be held by a thin plate 55 bent into a cylindrical shape, and is accommodated and installed in the entire annular oil sump chamber 44 formed on the outer periphery of the partition member 42.

With the configuration described above, according to the present embodiment, the following operational effects can be obtained.
The low-temperature and low-pressure refrigerant gas sucked into the cylinder chamber 20 of the low-stage rotary compressor 2 through the suction pipe 25 is compressed to the intermediate pressure by the rotation of the rotor 24, and then is discharged into the discharge chambers 26 and 27. Exhaled. The intermediate pressure refrigerant gas is merged in the discharge chamber 26 and then discharged into the lower space of the electric motor 4, from which it flows through a gas passage hole or the like provided in the rotor 6 of the electric motor 4 to be electrically driven. It flows into the upper space of the motor 4.

  The intermediate-pressure refrigerant gas flowing into the upper space of the electric motor 4 is fixedly scrolled through a gas flow path (not shown) formed on the outer periphery of the bearing member 31 constituting the high-stage scroll compressor 3. It is guided to a suction port (not shown) provided in the member 32 and sucked into the compression chamber 34. This intermediate-pressure refrigerant gas is compressed in two stages to a high temperature and a high pressure by a compression operation by the orbiting scroll member 33 being driven to revolve orbit, and then discharged into the discharge cover 38 from the discharge port 32C via the discharge valve 36.

  In the above-described two-stage compression process, part of the oil 15 supplied by the oil supply pump 14 and used for lubrication of the low-stage rotary compressor 2 dissolves in the refrigerant gas, and the sealed housing 10 together with the intermediate-pressure refrigerant gas. Vomited inside. Further, the intermediate pressure refrigerant gas is supplied to the high-stage scroll compressor 3 through the oil supply hole 16, and after the lubricant is lubricated, the oil 15 flows down to the bottom in the hermetic housing 10. Part of the melt. The intermediate-pressure refrigerant gas in which the oil 15 is dissolved in this manner is sucked into the scroll compressor 3 while being compressed, compressed, and discharged as a high-temperature high-pressure gas together with the oil from the discharge port 32C.

  The high-temperature and high-pressure compressed gas containing oil is discharged into the gas discharge chamber 43, and from there to the oil separation chamber 37 through the outlet 46 provided in the plate member 45, from the outermost peripheral region to the discharge cover 38. It is blown out in the tangential direction along the inner peripheral surface of. Therefore, a swirl flow is given to the compressed gas, and the oil contained in the compressed gas is separated by a centrifugal force due to the swirl flow, and further by collision with the oil separation promoting member 52 made of steel wool material, It flows down into the oil sump chamber 44 below. The compressed gas from which the oil has been separated is discharged to the refrigeration cycle side through a discharge pipe 39 connected to the center of the discharge cover 38.

  As a result, the oil circulation rate (OCR) of the oil 15 circulated in the refrigeration cycle can be reduced, the heat exchange efficiency on the refrigeration cycle side can be improved, and the shortage of lubricating oil in the multistage compressor 1 can be eliminated. Can do. On the other hand, the oil separated in the oil separation chamber 37 falls downward from the periphery of the plate member 45 and accumulates at the bottom of the oil reservoir chamber 44. The oil swirls in the same direction due to the swirling flow of the compressed gas. However, since the partition member 42 is eccentrically disposed in the oil reservoir chamber 44, the oil is discharged due to pressure loss in a narrow region of the eccentric direction. It becomes easy to gather near the area where the outlet 47 is opened.

  For this reason, the oil discharge port 47 can always be kept sealed with oil, and after the high pressure oil is depressurized through the depressurization mechanism formed by the fine groove provided in the gasket, the oil is dropped. The oil can flow down to the bottom of the sealed housing 10 through the holes 49, 50 and return to the oil sump. On the other hand, the oil accumulated in the oil sump chamber 44 is swung in the same direction under the influence of the swirling flow of the compressed gas. In the oil sump chamber 44, a hoisting prevention member 54 made of a steel wool material is provided. Since it is filled, it is possible to prevent undulation and winding of the oil due to the compressed gas flow blowing through the surface of the oil.

  Further, even if the oil stored in the oil reservoir 44 is rolled up by the compressed gas flow, the oil is provided along the outer periphery of the plate member 45 on the inner peripheral surface of the oil separation chamber 37 on the upper side. The oil separation accelerating member 52 can be re-separated and returned to the oil sump chamber 44, whereby the oil separation efficiency in the oil separation mechanism 40 can be maintained at a high level, and the oil from the multistage compressor 1 can be maintained. The rising phenomenon can be suppressed to a low level.

  Thus, according to the present embodiment, the oil is efficiently separated by the cyclone-type oil separation mechanism 40 in the discharge cover 38, and the oil is allowed to flow from the oil separation chamber 37 to the oil sump chamber 44 to be collected. While the pressure can be reduced and returned to the oil sump in the sealed housing 10 by a predetermined amount, the oil sump chamber 44 is filled with a hoisting prevention member 54 for preventing the accumulated oil from being rolled up by the compressed gas flow. Therefore, once separated oil is wound up by the compressed gas flow, and the oil rising phenomenon discharged to the outside together with the compressed gas can be effectively suppressed.

  Therefore, the oil separation efficiency by the oil separation mechanism 40 provided in the discharge cover 38 is increased, and the oil circulation rate (OCR) is reduced by suppressing the oil rising from the multistage compressor 1 (sealed scroll compressor 3). In addition, the heat exchange efficiency (system efficiency) in the refrigeration cycle can be increased.

  Further, the hoisting prevention member 54 has a structure in which a steel wool material formed in a ring shape is held by a cylindrical thin plate 55 and is housed and installed in an annular oil sump chamber 44 formed on the outer periphery of the partition member 42. It is set as the structure. For this reason, the oil roll-up preventing member 54 is made of a ring-shaped steel wool material held by a cylindrical thin plate 55, and is housed and installed in the annular oil sump chamber 44. The reservoir chamber 44 can be filled easily while maintaining a predetermined shape, whereby the winding-up preventing member 54 made of steel wool material can effectively and stably wind up the oil by the compressed gas flow. Therefore, it is possible to reliably prevent oil from rising by increasing the oil separation efficiency.

  In addition, since the hoisting prevention member 54 is filled in the entire area of the oil reservoir chamber 44 to prevent undulation and winding of the accumulated oil, the hoisting prevention member 54 filled in the entire area of the oil reservoir chamber 44 It is possible to prevent undulation and winding of the oil due to the compressed gas flow blowing through the surface of the oil accumulated in the oil sump chamber 44. Therefore, it is possible to reliably prevent the oil separated by the oil separation chamber 37 and accumulated in the oil reservoir chamber 44 from being compressed by the compressed gas flow, and to suppress the oil rising by increasing the oil separation efficiency.

  Furthermore, in the present embodiment, the separation of the oil from the compressed gas is promoted on the inner peripheral surface above the plate member 45 in the oil separation chamber 37, and the oil wound up from the oil sump chamber 44 is recycled. The oil separation promoting member 52 for separation is provided. For this reason, the compressed gas blown into the oil separation chamber 37 from the gas discharge chamber 43 through the outlet 46 provided in the plate member 45 is supplied along the inner peripheral surface of the oil separation chamber 37. Oil separation can be promoted, for example, by colliding with the separation promoting member 52, and the separated oil can be stored in the lower oil reservoir chamber 44 and returned to the oil reservoir in the sealed housing 10.

  On the other hand, even if the oil stored in the oil reservoir chamber 44 is wound up by the compressed gas flow, the oil separation promoting member 52 provided again along the inner peripheral surface of the upper oil separation chamber 37. And can be returned to the oil sump chamber 44 filled with the hoisting prevention member 54. Therefore, the oil separation efficiency is further improved by the synergistic effect of the oil separation promoting member 52 provided on the inner peripheral surface of the oil separation chamber 37 and the hoisting prevention member 54 filled in the oil sump chamber 44. The rise can be greatly reduced.

  The oil separation promoting member 52 is configured to hold a steel wool material formed in a ring shape via thin plate pieces provided at a plurality of positions on the outer periphery of the plate member 45, and is formed by a discharge cover 38. It is configured to be accommodated and installed along the inner peripheral surface in the oil separation chamber 37. For this reason, the oil separation promoting member 52 can be easily installed along the inner peripheral surface of the oil separation chamber 37 in a state where the oil separation promoting member 52 is kept in a predetermined shape, and is thus configured by a steel wool material. The oil separation promoting member 52 effectively and stably promotes the separation of oil contained in the compressed gas and the re-separation of the oil wound up from the oil reservoir, and reliably suppresses the oil rising by increasing the oil separation efficiency. It becomes possible to do.

  In addition, this invention is not limited to the invention concerning the said embodiment, In the range which does not deviate from the summary, it can change suitably. For example, the compressor 1 can be applied to a compressor for a refrigeration cycle using an HFC refrigerant, a CO2 refrigerant, or the like, but is particularly suitable for a scroll compressor 3 for a CO2 refrigerant that is a high-pressure refrigerant. That is, since the CO2 refrigerant has a high pressure and a high density and it is difficult to separate the oil, it is necessary to improve the oil separation performance. Therefore, the scroll compressor 3 according to the present invention that can maintain a high level of oil separation efficiency is effective. .

  Moreover, in the said embodiment, although the partition member 42 is comprised separately from the fixed scroll member 32, this invention is not limited to this, The partition member 42 is the end plate of the fixed scroll member 32. It is good also as a structure integrally molded in the back side of 32A. However, in this case, the pressure reducing mechanism for reducing the pressure of the separated oil and returning it to the oil reservoir in the hermetically sealed housing 10 needs to be changed from that of the above configuration. Moreover, in the said embodiment, although the steel wool material is applied as the oil separation promotion member 52 and the hoisting prevention member 54, not only this but other members which have heat resistance, refrigerant resistance, oil resistance, etc. are used. Of course, it may be used.

  Furthermore, in the above-described embodiment, the partition member 42 is installed eccentrically, the annular oil reservoir chamber 44 whose outer periphery and inner periphery are eccentric is formed on the outer periphery thereof, and the winding formed into a ring shape that matches the shape thereof Although the configuration is such that the prevention member 54 is filled, it is not essential to have an eccentric shape or configuration, and it may be an annular or ring shape.

DESCRIPTION OF SYMBOLS 1 Multistage compressor 3 Scroll compressor 32 Fixed scroll member 32C Discharge port 37 Oil separation chamber 38 Discharge cover 40 Oil separation mechanism 42 Partition member 43 Gas discharge chamber 44 Oil reservoir chamber 45 Plate member 46 Outlet port 52 Oil separation promotion member 53 Thin plate Piece 54 roll-up prevention member 55 cylindrical thin plate

Claims (3)

In a hermetic scroll compressor having a discharge cover installed on the back side of a fixed scroll member provided with a discharge port, and an oil separation mechanism provided in an oil separation chamber formed by the discharge cover,
The oil separation mechanism includes a partition member that divides the oil separation chamber into an inner gas discharge chamber and an oil reservoir chamber on the outer periphery, and a plate member installed on an upper surface of the partition member, The plate member is configured to have a blowout port for blowing compressed gas from the gas discharge chamber to a space in the oil separation chamber above the plate member,
The oil sump chamber formed on the outer periphery of the partition member is filled with a hoisting prevention member that holds the oil separated in the oil separation chamber and prevents its hoisting,
An oil separation promoting member that promotes separation of oil from compressed gas along an inner peripheral surface above the plate member in the oil separation chamber and re-separates the oil wound up from the oil reservoir chamber. Provided ,
The hoisting prevention member is configured to hold a steel wool material formed in a ring shape by a cylindrical thin plate, and is housed and installed in the annular oil sump chamber formed on the outer periphery of the partition member. Hermetic scroll compressor. 2. The hermetic scroll compressor according to claim 1, wherein the hoisting prevention member is filled in the entire area of the oil sump chamber and is configured to prevent the accumulated oil from wavy and hoisting. The oil separation promoting member is configured to hold a steel wool material formed in a ring shape via thin plate pieces provided at a plurality of positions on the outer periphery of the plate member, and the oil separation formed by the discharge cover. The hermetic scroll compressor according to claim 1 , wherein the hermetic scroll compressor is housed and installed on an inner peripheral surface of the room.

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