JP2005264878A - Horizontal type rotary compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a horizontal type rotary compressor restraining oil discharged into a sealed container from a bearing part of a rotary shaft, from intruding into refrigerant gas of medium pressure. <P>SOLUTION: An electric element 5 and a rotary compression element 6 are disposed in the horizontally-placed sealed container 1, and the refrigerant gas of medium pressure compressed by a low stage side rotary compression element 8 is discharged into the sealed container 1. A main frame 16 mounted to a high stage side rotary compression element 9 is provided with a bearing part 16a and a silencing chamber 16b at the outer periphery of the bearing part 16a. An open face of the silencing chamber 16b is blocked with a cover plate 17. A baffle plate 18 is mounted to the outer periphery of the cover plate 17 to partition the inside of the sealed container 1, and differential pressure is generated on the electric element 5 side and the rotary compression element 6 side. An oil recovery means 19 is provided to surround the outer periphery of the bearing part 16a. The oil recovery means 19 is formed of an oil receiving member 20 formed almost in cap shape, and its flange part 20a is fixedly mounted to the cover plate 17. A side end part is provided with a hole 20b for the rotary shaft 7 to pass through, and a bottom part is provided with an oil escape hole 20c. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a horizontal rotary compressor, and more particularly to a horizontal rotary compressor that recovers oil discharged from a bearing portion of a rotary shaft into a sealed container and returns it to an oil reservoir at the bottom in the sealed container.

2. Description of the Related Art Conventionally, a horizontal rotary compressor in which an airtight container is placed horizontally and an electric element and a rotary compression element driven by the electric element via a rotation shaft are disposed therein is known (for example, Patent Document 1). . In this type of horizontal rotary compressor, an oil sump is usually formed at the bottom of the hermetic container, and oil is pumped from the oil sump via a suction pipe, and the sliding part of the rotary compression element and the bearing part of the rotary shaft For example, it is protected from abrasion by supplying to the other parts, and the compression performance is enhanced by improving the oil sealability of the compression part in the rotary compression element.
JP 7-229495 A

  In the above horizontal rotary compressor, the oil supplied to the bearing portion of the rotating shaft is discharged into the sealed container from the tip of the bearing portion after lubrication. However, since the rotating shaft is rotating, centrifugal force acts on the bearing. Radiated from the tip of the part. The oil discharged into the sealed container is heavy and falls and returns to the bottom oil sump in the sealed container, but some oil is compressed by the low-stage rotary compression element and discharged into the sealed container. Mixed in the refrigerant gas.

  The oil mixed in the intermediate pressure refrigerant gas is taken out of the closed container together with the intermediate pressure refrigerant gas from the outlet port provided in the closed container. The intermediate-pressure refrigerant gas taken out of the hermetic container is introduced into the high-stage rotary compression element and compressed to a high pressure, and then discharged out of the hermetic container and supplied to a refrigeration cycle such as an air conditioner. For this reason, the oil mixed in the refrigerant gas is taken out of the sealed container together with the high-pressure refrigerant gas.

  Since such a phenomenon is repeatedly performed during operation, the amount of oil in the oil reservoir in the sealed container is gradually reduced, and the oil level of the oil is lowered. When the oil level in the oil reservoir becomes low, pumping of oil through the suction pipe by the oil pump becomes insufficient or impossible, and is supplied to the sliding portion of the rotary compression element, the bearing portion of the rotary shaft, etc. Insufficient oil prevents protection from wear. Further, the compression of the refrigerant gas in the high stage side rotary compression element is hindered by the mixed oil, and the compression performance is lowered.

  The present invention has been made in order to solve the problems in the conventional horizontal rotary compressor described above, and oil discharged from the bearing portion of the rotary shaft into the sealed container is mixed into the refrigerant gas having an intermediate pressure. An object of the present invention is to provide a horizontal rotary compressor that suppresses the above.

  As means for achieving the above object, according to claim 1 of the present invention, an electric element and a rotary compression element driven by the electric element via a rotating shaft are arranged in a horizontally placed sealed container. The main frame fixed in the sealed container is provided with a bearing portion to support the rotating shaft, and the opening surface of the sound deadening chamber formed on the outer periphery of the bearing portion is closed with a cover plate. The horizontal rotary compressor is characterized in that oil recovery means for recovering oil discharged from the tip of the bearing portion and returning it to the oil reservoir at the bottom in the sealed container is provided on the outer periphery of the bearing portion. .

  According to a second aspect of the present invention, in the horizontal rotary compressor according to the first aspect, the oil recovery means comprises an oil receiving member fixed to the cover plate, and a hole is provided in the bottom of the oil receiving member. It is characterized by.

  According to a third aspect of the present invention, in the horizontal rotary compressor according to the second aspect, the oil receiving member has a substantially cap shape in which a flange portion is provided on one side end portion, and the flange portion is It is fixed to the cover plate, and a hole through which the rotating shaft passes is provided at the other side end, and an oil escape hole for dropping oil into the oil reservoir is provided at the bottom.

  According to the first aspect of the present invention, the bearing portion is provided in the main frame fixed in the horizontally placed sealed container to support the rotating shaft, and the silencing chamber formed on the outer periphery of the bearing portion. In the horizontal rotary compressor in which the opening surface is closed with a cover plate, oil recovery means is provided on the outer periphery of the bearing portion, so that oil discharged from the tip of the bearing portion is recovered and oil at the bottom in the sealed container Can be returned to the reservoir. As a result, the oil level of the oil reservoir can be prevented from lowering during operation, and the oil can be sufficiently pumped through the suction pipe by the oil pump. The sliding part of the rotary compression element and the bearing part of the rotary shaft The required amount of oil can be supplied to the wearer to protect it from wear. Further, since the recovered oil is a degassed oil and has a high lubricating performance, wear can be reduced by using it in preference to the oil stored in the oil reservoir.

  According to the second aspect of the present invention, in the horizontal rotary compressor according to the first aspect, the oil recovery means can be composed of an oil receiving member fixed to the cover plate, and the bottom of the oil receiving member Since the hole is provided in the oil collecting member, the oil discharged from the tip of the bearing part can be collected in the oil receiving member and dropped from the hole in the bottom part to the oil reservoir.

  According to the third aspect of the present invention, in the horizontal rotary compressor according to the second aspect, the oil receiving member is provided with a flange portion at one side end portion, and the rotation shaft passes through the other side end portion. Therefore, it can be manufactured at a low cost with a simple structure having a substantially cap shape provided with holes. Further, the flange portion can be easily attached by being fixed to the cover plate, and the oil can be dropped and recovered from the oil relief hole provided in the bottom portion to the oil reservoir.

  Next, an embodiment of a horizontal rotary compressor according to the present invention will be described with reference to the accompanying drawings. FIG. 1 is a schematic sectional view showing an embodiment of a horizontal rotary compressor according to the present invention.

  In FIG. 1, reference numeral 1 denotes a metal sealed container, which is composed of a horizontal container 2 formed in a cylindrical shape, and end caps 3 and 4 welded to the open ends of the container 2, respectively. . An electric element 5 and a rotary compression element 6 driven by the electric element 5 are disposed in the airtight container 1 so as to be located on the left and right.

  The electric element 5 includes an annular stator 5a fixed to the inner surface of the hermetic container 1, and a rotor 5b that rotates in the stator 5a. The rotor 5b is attached to the left end of the rotating shaft 7. Has been. Although not shown, a terminal is attached to the end cap 3, and a connection terminal of the terminal is connected to the stator 5a via an internal lead wire and to an external power source via an external lead wire. When power is supplied to the stator 5a through the terminal, the rotor 5b rotates, and the rotating shaft 7 rotates as the rotor 5b rotates.

  The rotary compression element 6 includes a low stage side rotary compression element 8 and a high stage side rotary compression element 9, which are partitioned by a partition plate 10 and arranged in parallel. The low-stage side rotary compression element 8 is provided with a compression chamber 8b inside a cylinder 8a, and a roller 8c fitted to a low-stage side eccentric portion 7a formed on the rotary shaft 7 passes through the compression chamber 8b. Eccentric rotation. Although not shown, the low-stage rotary compression element 8 is biased by a spring and pressed against the outer peripheral surface of the roller 8c, thereby dividing the compression chamber 8b into a low pressure chamber and a high pressure chamber. Similarly, the high-stage side rotary compression element 9 has a compression chamber 9b provided in the cylinder 9a, and a roller 9c fitted to the high-stage side eccentric part 7b formed on the rotary shaft 7. The inside of the compression chamber 9b rotates eccentrically. Although not shown, the high-stage rotary compression element 9 is biased by a spring and pressed against the outer peripheral surface of the roller 9c, thereby dividing the compression chamber 9b into a low pressure chamber and a high pressure chamber. The low-stage eccentric portion 7a and the high-stage eccentric portion 7b of the rotary shaft 7 are formed with a 180 ° phase shift.

  A subframe 11 is attached to the low-stage rotary compression element 8, and a cover plate 12 is attached to the right side of the subframe 11. The sub-frame 11 is provided with a bearing portion 11a in the center and pivotally supports the right end portion of the rotating shaft 7. A silencer chamber 11b is provided in a concave shape on the outer periphery of the bearing portion 11a. The opening surface of 11 b is closed by the cover plate 12. In addition, a hole is formed in the center of the cover plate 12, and an oil pump 13 that engages with the rotary shaft 7 is mounted. A suction pipe 14 is attached to the oil pump 13, and its lower end is an oil reservoir 15. Has been inserted.

  A main frame 16 is attached to the high stage side rotary compression element 9, and a cover plate 17 is attached to the left side of the main frame 16. The main frame 16 is provided with a bearing portion 16a in the center and supports the substantially central portion of the rotary shaft 7. A silencer chamber 16b is provided in a concave shape on the outer periphery of the base portion of the bearing portion 16a. The opening surface of 16 b is closed by the cover plate 17.

  An annular baffle plate 18 is attached to the outer periphery of the cover plate 17, and the inside of the sealed container 1 is partitioned into the electric element 5 side and the rotary compression element 6 by the baffle plate 18, and the electric element 5 side and the rotary compression element 6 are partitioned. A differential pressure is generated between the two sides. Further, a gap for allowing refrigerant gas to pass therethrough is provided in the upper part of the baffle plate 18, and a gap for passing oil is provided in the lower part. Although not shown, the cover plate 17 may be used as the baffle plate 18 without attaching the baffle plate 18.

  In the present embodiment, oil recovery means 19 is provided on the outer periphery of the bearing portion 16a of the main frame 16 to collect oil discharged from the tip of the bearing portion 16a and return it to the oil sump 15 at the bottom in the sealed container 1. . In this case, the oil collecting means 19 is constituted by an oil receiving member 20 formed in a substantially cap shape, a flange portion 20a is provided at one side end of the oil receiving member 20, and the rotating shaft is provided at the other side end. 7 is provided with a hole 20b, and an oil relief hole 20c is provided at the bottom. The oil receiving member 20 is attached by fixing the flange portion 20a to the cover plate 17, and is positioned so as to surround the outer periphery of the bearing portion 16a.

  The hermetic container 1 is provided with a first inlet 21 for refrigerant gas. The first inlet 21 is formed in a suction port (not shown) formed in the subframe 11 and a cylinder 8a. It is connected to the low pressure chamber of the low stage side rotary compression element 8 via a passage (not shown). Further, a discharge port (not shown) is formed in the subframe 11, and the high pressure chamber of the low-stage side rotary compression element 8 and the sound deadening chamber 11b in the subframe 11 are connected via this discharge port. Further, one end of an intermediate discharge pipe 22 is opened in the sound deadening chamber 11b of the subframe 11, and this intermediate discharge pipe 22 is a cylinder 8a of the low-stage side rotary compression element 8, a partition plate 10, and a high-stage side rotary compression. The cylinder 9 a of the element 9, the main frame 16, the cover plate 17, and the flange portion 20 a of the oil receiving member 20 are attached through the other end, and the other end opens into the sealed container 1. Thus, the refrigerant gas introduced from the first introduction port 18 is compressed to an intermediate pressure by the low stage side rotary compression element 8 and is discharged into the sealed container 1 through the intermediate discharge pipe 22.

  A first outlet 23 is provided at the end of the sealed container 1 on the rotary compression element 6 side. The first outlet 23 is connected to a second inlet 24 provided in the sealed container 1. 25 are connected. Thereby, the intermediate-pressure refrigerant gas taken out from the closed container 1 from the first outlet 23 can be introduced into the second inlet 24 via the connecting pipe 25.

  The second introduction port 24 is connected to the low pressure chamber of the high-stage side rotary compression element 9 via a suction port (not shown) formed in the main frame 16 and a passage (not shown) formed in the cylinder 9a. Connected to. A discharge port (not shown) is formed in the main frame 16, and the high pressure chamber of the high-stage side rotary compression element 9 and the sound deadening chamber 16b in the main frame 16 are connected via the discharge port, and the sound deadening chamber 16b. Is communicated with the second outlet 26 provided in the sealed container 1. Thereby, the intermediate-pressure refrigerant gas introduced from the second introduction port 24 is compressed to a high pressure by the high-stage side rotary compression element 9 and discharged from the second outlet 26 to the outside of the sealed container 1. .

  The operation of the thus configured horizontal rotary compressor will be described. When power is supplied to the stator 5a of the electric element 5 via the terminal (not shown), the rotor 5b rotates and the operation is started. The refrigerant gas introduced from the first introduction port 21 is sucked into a suction port (not shown) formed in the subframe 11 and passes through a passage (not shown) formed in the cylinder 8a. The low-stage side rotary compression element 8 is sucked into the low-pressure chamber of the compression chamber 8b and compressed to an intermediate pressure by the eccentric rotation of the roller 8c.

  The refrigerant gas compressed to the intermediate pressure is discharged from the high-pressure chamber of the low-stage side rotary compression element 8 through the discharge port (not shown) formed in the subframe 11 to the silencer chamber 11b. Is discharged into the sealed container 1 through the intermediate discharge pipe 22. The intermediate-pressure refrigerant gas discharged into the sealed container 1 moves to the space on the end cap 4 side through the gap above the baffle plate 18 and the gap above the rotary compression element 6, and the first outlet port. 23 is taken out from the sealed container 1. The intermediate-pressure refrigerant gas taken out of the sealed container 1 is introduced into the second inlet 24 through the connection pipe 25.

  The intermediate-pressure refrigerant gas introduced from the second inlet 24 is sucked into a suction port (not shown) formed in the main frame 16 and a passage (not shown) formed in the cylinder 9a. And is sucked into the low pressure chamber of the compression chamber 9b of the high-stage side rotary compression element 9 and compressed to a high pressure by the eccentric rotation of the roller 9c.

  The refrigerant gas compressed to a high pressure is discharged from the high-pressure chamber of the high-stage side rotary compression element 9 through the discharge port (not shown) formed in the main frame 16 to the silencing chamber 16b, and into the silencing chamber 16b. It discharges out of the airtight container 1 from the 2nd outlet 26 which is connected. The high-pressure refrigerant gas discharged out of the sealed container 1 is supplied to a refrigeration cycle such as an air conditioner via a refrigerant gas supply pipe (not shown) connected to the second outlet 26. Then, after going through the refrigeration cycle, the refrigerant gas having a low pressure is returned to the compressor from the first inlet 21 via a refrigerant gas return pipe (not shown).

  During the operation of the compressor, the oil pump 13 pumps up the oil in the oil reservoir 15 through the suction pipe 14 and supplies it to the end of the rotating shaft 7. The oil supplied to the end of the rotating shaft 7 moves by a centrifugal force along a shaft hole (not shown) formed in the rotating shaft 7, and a part of the oil is formed at an appropriate position of the rotating shaft 7. A plurality of small holes (not shown) projecting to the outer peripheral surface, the bearing portion 11a of the subframe 11, the bearing portion 16a of the main frame 16, the sliding portion of the roller 8c in the low-stage side rotary compression element 8, The sliding part of the roller 9c in the high stage side rotary compression element 9 is lubricated.

  The oil squeezed out on the outer peripheral surface of the rotating shaft 7 gradually moves to the left by centrifugal force and is discharged from the tip of the bearing portion 16a of the main frame 16. The discharged oil is released radially by the rotation of the rotating shaft 7, but the outer periphery of the bearing portion 16 a is surrounded by the oil receiving member 20, and is thus received by the oil receiving member 20. Then, the oil received by the oil receiving member 20 flows down the inner surface and accumulates at the bottom, falls from the oil relief hole 20 c and returns to the oil reservoir 15. Thereby, the oil discharged | emitted from the bearing part 16a of the main frame 16 is recoverable.

  Since the oil can be collected in this way, it is possible to suppress a decrease in the amount of oil in the oil reservoir 15 during operation. The oil sump 15 at the bottom in the hermetic container 1 moves from the electric element 5 side to the rotary compression element 6 side through the gap under the baffle plate 18 due to the differential pressure generated by the baffle plate 18, and the rotary compression element 6 side. The oil level is higher than the oil level on the electric element side 5. For this reason, the oil pump 13 sufficiently draws up the oil through the suction pipe 14, and a necessary amount of oil is supplied to the sliding portion of the rotary compression element 6 and the bearing portion of the rotary shaft 7 to wear. Can be protected from. Moreover, since the oil mixed in the refrigerant gas of intermediate pressure in the sealed container 1 can be suppressed, the compression of the refrigerant gas in the high stage side rotary compression element 9 is not inhibited by the oil, and the compression performance can be improved.

  The oil that has passed through the shaft hole (not shown) of the rotating shaft 7 is discharged radially into the sealed container 1 and drops because it is heavy, and returns to the oil reservoir 15. A part of the intermediate-pressure refrigerant gas discharged into the hermetic container 1 enters the space on the end cap 3 side through a slight gap between the stator 5a and the rotor 5b in the electric element 5, so that the rotating shaft The oil discharged from the shaft hole 7 is mixed. For this reason, it is desirable to provide an appropriate oil recovery means also in the space area on the end cap 3 side. As the oil collecting means, although not shown, for example, if the flange portion 20a of the oil receiving member 20 is fixed to the end cap 3 and positioned so that the tip of the rotary shaft 7 is inserted into the hole 20b at the tip. Easy to implement. Other forms of oil recovery means may be used.

  The oil receiving member 20 as the oil collecting means has a simple structure and can be manufactured at low cost, and can be easily attached using the flange portion 20a, so that it is easy to use.

  The present invention can be applied to an internal intermediate pressure type horizontal rotary compressor, and is not limited thereto, and can also be applied to an internal high pressure horizontal rotary compressor. In addition, the horizontal rotary compressor according to the present invention can be used by being incorporated in a refrigerator, a freezer, a vending machine or the like as well as an air conditioner.

1 is a schematic cross-sectional view showing an embodiment of a horizontal rotary compressor according to the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Airtight container 2 Container 3, 4 End cap 5 Electric element 6 Rotation compression element 7 Rotating shaft 8 Low stage side rotation compression element 9 High stage side rotation compression element 10 Partition plate 11 Subframe 12 Cover plate 13 Oil pump 14 Suction pipe 15 Oil reservoir 16 Main frame 16a Bearing portion 17 Cover plate 18 Baffle plate 19 Oil collecting means 20 Oil receiving member 20a Flange portion 20b Hole 20c Oil relief hole

Claims (3)

  An electric element and a rotary compression element driven by the electric element via a rotating shaft are disposed in a horizontally placed sealed container, and a bearing portion is provided on a main frame fixed in the sealed container. A horizontal rotary compressor that supports a rotating shaft and closes an opening surface of a silencer chamber formed on the outer periphery of the bearing portion with a cover plate, and collects oil discharged from the tip of the bearing portion The horizontal rotary compressor is characterized in that oil recovery means for returning to the oil sump at the bottom of the sealed container is provided on the outer periphery of the bearing portion.   2. The horizontal rotary compressor according to claim 1, wherein the oil collecting means comprises an oil receiving member fixed to the cover plate, and a hole is provided in a bottom portion of the oil receiving member.   The oil receiving member has a substantially cap shape in which a flange portion is provided at one side end portion, the flange portion is fixed to the cover plate, and a hole through which the rotating shaft passes is provided at the other side end portion. The horizontal rotary compressor according to claim 2, wherein an oil relief hole is provided at the bottom portion for dropping the oil into the oil reservoir.

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