JP2005220781A - Horizontal multistage rotary compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a horizontal multistage rotary compressor with a tuck frame formed of an aluminum material and welded to a sealed container for functioning as a baffle plate and as a cover plate for a sound eliminating chamber of a supporting member. <P>SOLUTION: The tuck frame 18 formed of an aluminum material is tuck welded W to a container 2 to partition the sealed container 1 into the sides of an electromotive element 5 and a rotary compression element 6. The tuck frame 18 has a clearance 18d and a small hole 18c in the lower end and in the upper end, respectively, for functioning as the baffle plate and as the cover plate which closes the opening face of the sound eliminating chamber 13b of the second supporting member 13. Intermediate-pressure refrigerant gas compressed by a first rotary compression element 9 is discharged to the side of the electromotive element 5 and lubricating oil is separated therefrom and dropped. The lubricating oil dropped on the side of the electromotive element 9 is moved into a lubricating oil sump on the side of the rotary compression element 6 to increase an oil level by utilizing differential pressure between the electromotive element 5 and the rotary compression element 6. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a horizontal multistage rotary compressor, and in particular, a tack frame is attached to a sealed container by welding, and functions as a baffle plate on the tack frame and a cover plate for a muffler chamber provided in the rotary compression element. The present invention relates to a horizontal multistage rotary compressor having the function of

  Conventionally, a horizontal type in which an electric element and a rotary compression element driven by the electric element are disposed in a horizontally disposed sealed container, and refrigerant gas is compressed by the rotary compression element and then discharged outside the sealed container. Multistage rotary compressors are known. For example, what is shown in FIG. 3 is an example of a horizontal type two-stage rotary compressor, and a rotary compression element including a first rotary compression element B and a second rotary compression element C is provided in a sealed container A. The element is driven via a rotating shaft E by an electric element D disposed in the sealed container A. Then, the refrigerant gas supplied from the outside of the sealed container A is compressed to an intermediate pressure by the first rotary compression element B and discharged into the sealed container A, and the refrigerant gas at the intermediate pressure is discharged to the second rotary compression element C. And compressed to a high pressure and discharged to the outside of the sealed container A.

  In the horizontal two-stage rotary compressor, a baffle plate F is provided in the hermetic container A to divide the inside of the hermetic container A into a rotary compression element side and an electric element D side, and the first rotary compression element B By discharging the intermediate-pressure refrigerant gas compressed in step S5 to the electric element D side, the internal pressure on the electric element D side becomes higher than the internal pressure on the rotary compression element side.

  The bottom of the sealed container A is a lubricating oil reservoir, and the lubricating oil is pumped up from the lubricating oil reservoir through the pumping pipe H by the oil pump G. The pumped lubricating oil is used as the first rotary compression element B, the second The structure is such that each sliding portion is lubricated by being guided to the rotary compression element C or the like. And after lubrication, it is discharged from the rotary compression element and falls into the lubricating oil reservoir. A part of the lubricating oil is mixed in the refrigerant gas at the intermediate pressure discharged to the electric element D side, and this lubricating oil is separated from the refrigerant gas and falls to the bottom part on the electric element D side.

A gap I is provided at the lower end portion of the baffle plate F in order to return the lubricating oil dropped to the bottom portion on the electric element D side to the lubricating oil reservoir on the rotary compression element side. By providing this gap I, a part of the refrigerant gas (intermediate pressure) on the electric element D side flows into the rotary compression element side having a low internal pressure, and drops to the electric element D side as the refrigerant gas moves. The lubricating oil is returned to the lubricating oil reservoir on the rotary compression element side. Thereby, the oil level of the lubricating oil reservoir is increased to prevent the pumping failure or the pumping failure of the oil pump G (for example, Patent Document 1).
JP 2003-293974 A

  In the conventional horizontal two-stage rotary compressor, the baffle plate F is a separate component from the rotary compression element, and the cover plate L must be attached to the noise reduction chamber K of the support member J in the rotary compression element. Increasing the number of parts has led to an increase in manufacturing costs. The baffle plate F is usually formed of a steel plate, and the center hole portion is welded to the bearing portion M of the support material J. For this reason, the weight of the compressor becomes heavy, and it is not suitable for use as a compressor for a car air conditioner mounted on an automobile, for example. Further, the thin-walled bearing portion M is easily affected by heat during welding of the baffle plate F, which may lead to deformation or a decrease in strength, and thus the bearing function is impaired and the rotation of the rotating shaft E is adversely affected. May cause performance degradation.

  The present invention has been made to solve such problems in the prior art, and reduces the number of parts by providing the tack frame with a function as a baffle plate and a function as a cover plate for a muffler chamber. In addition to reducing the manufacturing cost, the weight of the compressor is reduced by forming the tack frame from an aluminum material, and the bearing portion of the support material is protected from welding heat by welding to the sealed container. An object of the present invention is to provide a horizontal multistage rotary compressor.

  In order to achieve the above object, claim 1 of the present invention provides a horizontal multistage rotary compressor in which an electric element and a rotary compression element driven by the electric element are disposed in a sealed container. A tack frame made of an aluminum material is attached by welding its outer peripheral edge to the sealed container in order to partition the rotary compression element, and functions as a baffle plate and a muffler chamber provided in the rotary compression element It has a function as a cover plate.

  According to a second aspect of the present invention, in the horizontal multistage rotary compressor of the first aspect, a small hole is provided in the tack frame, and the electric element side and the rotary compression element side are communicated to generate a differential pressure. And

  According to a third aspect of the present invention, in the horizontal multistage rotary compressor according to the second aspect, the small hole has a diameter of 2 to 8 mm.

  According to the first aspect of the present invention, a tack frame made of an aluminum material is incorporated as a cover plate of a silencer chamber of a support material in a rotary compression element and is provided with a function as a baffle plate, thereby reducing the number of parts. Cost can be reduced. Moreover, since the tack frame is made of an aluminum material, it is lighter than conventional steel plates, and is suitable for use as a compressor for a car air conditioner of an automobile by reducing the weight of the compressor. Can be. Furthermore, since the tack frame is welded and attached to the sealed container, the bearing portion of the support material can be protected from welding heat, thereby preventing the function of the bearing from being hindered and causing no deterioration in the performance of the compressor.

  According to the invention of claim 2, by providing a small hole in the tack frame, the rotary compression element side and the electric element side are communicated to generate a differential pressure, and discharged through the small hole to the electric element side. The refrigerant gas at intermediate pressure can be moved to the rotary compression element side. Due to the movement of the refrigerant gas, the lubricating oil can be efficiently returned from the electric element side to the rotary compression element side through the gap provided at the lower portion of the tack frame, and the oil level of the lubricating oil reservoir can be raised.

  According to the invention of claim 3, by setting the diameter of the small hole provided in the tack frame to 2 to 8 mm, the flow of the refrigerant gas at the intermediate pressure moving from the electric element side to the rotary compression element side can be regulated. it can. Thereby, while maintaining the differential pressure | voltage of the electric element side and the rotation compression element side, the flow of the lubricating oil which moves to the rotation compression element side from an electric element side can be controlled.

  Next, embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a schematic longitudinal sectional view showing an embodiment in which the present invention is applied to a horizontal two-stage rotary compressor. FIG. 2 is a schematic cross-sectional view of the horizontal two-stage rotary compressor of FIG. FIG. 3 is a schematic longitudinal sectional view showing an example of a conventional horizontal two-stage rotary compressor.

  In FIG. 1, reference numeral 1 denotes a sealed container, which is formed by welding end caps 3 and 4 to open end portions of a substantially cylindrical container 2 disposed laterally, and an electric element 5 and a rotary compression element are contained therein. 6 are arranged. In this case, the sealed container 1 and the end caps 3 and 4 are formed of an aluminum material, and an aluminum alloy containing, for example, Si, Mg, or Cu can be used as the aluminum material.

  The electric element 5 includes a stator 5a fixed to the inner surface of the hermetic container 1 and a rotor 5b rotatably inserted into the stator 5a. The rotor 5b protrudes from the rotary compression element 6. It is attached to the end of the rotating shaft 7.

  A terminal 8 is mounted on the end cap 3 on the side of the electric element 5 of the sealed container 1, and this terminal 8 has a mounting base 8a and a plurality of connections penetrating through the base 8a through an electrical insulating material. Terminal 8b. Although not shown, external lead wires and internal lead wires are connected to the respective ends of the plurality of connection terminals 8b, the external lead wires are connected to the external power source, and the internal lead wires are connected to the stator 5a of the electric element 5. By being connected to each other, the stator 5a can be energized.

  The rotary compression element 6 includes a first rotary compression element 9 and a second rotary compression element 10. A partition plate 11 is interposed therebetween, and the first rotary compression element 9 includes a first rotary compression element 9. The second rotation compression element 10 is provided with a second support member 13 and is integrated by a through bolt (not shown) or the like.

  The first rotary compression element 9 includes a cylinder 9a and a roller 9b that rotates eccentrically inside the cylinder 9a. The roller 9b is fitted into a first eccentric portion 7a formed on the rotary shaft 7. In addition, a vane (not shown) urged by a spring 9c is always in pressure contact with the outer peripheral surface of the roller 9b, and a low pressure chamber and a high pressure chamber are formed inside the cylinder 9a.

  Similarly, the second rotary compression element 10 includes a cylinder 10a and a roller 10b that rotates eccentrically inside the cylinder 10a. The roller 10b is a second eccentric portion 7b formed on the rotary shaft 7. The vane (not shown) urged by the spring 10c is always in pressure contact with the outer peripheral surface of the roller 10b, and a low pressure chamber and a high pressure chamber are formed inside the cylinder 10a. The first eccentric portion 7a and the second eccentric portion 7b of the rotating shaft 7 are provided with a 180 ° phase shift.

  The first support member 12 is provided with a bearing portion 12a that pivotally supports the end of the rotary shaft 7 at the center, and a muffler chamber 12b is provided in a concave shape so as to surround the outer periphery of the bearing portion 12a. The silencing chamber 12 b is closed at the opening by a cover plate 14 fixed to the first support member 12. As shown in FIG. 2, the first support member 12 is formed with a suction port 12 c for sucking the refrigerant gas from the refrigerant gas introduction pipe 15, and the suction port 12 c is connected to the first rotary compression element 9. It communicates with the inlet of the low pressure chamber via a passage 9d provided in the cylinder 9a. Further, a passage (not shown) is formed in the first support member 12, and this passage communicates the outlet of the high pressure chamber of the cylinder 9a and the sound deadening chamber 12b. Further, a passage (not shown) is formed in the first support member 12, and this passage extends from the silencer chamber 12 b to the cylinder 9 a of the first rotary compression element 9, the partition plate 11, and the cylinder of the second rotary compression element 10. 10a, the second support member 13, and a tack frame 18 to be described later communicate with a discharge hole (not shown). The discharge hole opens on the electric element 5 side, and the discharge pipe 16 is provided upright.

  As shown in FIG. 2, the second support member 13 is provided with a bearing portion 13a that supports the rotating shaft 7 at the center, and the sound deadening chamber 13b is formed in a concave shape so as to surround the outer periphery of the bearing portion 13a. The silencing chamber 13 b is closed at the opening by a tack frame 18. The second support member 13 is formed with a suction port 13c for sucking in refrigerant gas at an intermediate pressure, and the suction port 13c is connected via a passage 10d provided in the cylinder 10a of the second rotary compression element 10. And communicates with the entrance of the low pressure chamber. In addition, a passage (not shown) is formed in the second support member 13, and this passage communicates the outlet of the high pressure chamber of the cylinder 10a and the sound deadening chamber 13b. Further, a discharge port 13d is formed in the second support member 13, and the discharge port 13d communicates the sound deadening chamber 13b with the refrigerant gas outlet pipe 17.

  The tack frame 18 is made of an aluminum material, and as shown in FIG. 1, the center hole 18a is fitted into the bearing portion 13a of the second support member 13 to be in close contact with the second support member 13, and this state is maintained. The flange portion 18b formed on the outer periphery is fixed by tack welding W. As a result, the inside of the sealed container 1 is divided into the electric element 5 side and the rotary compression element 6 side, and the tack frame 18 closes the opening surface of the sound deadening chamber 13b in the second support member 13, so that the conventional cover plate It will have the function of. Further, a small hole 18 c is provided at the upper end portion of the tack frame 18, and a gap 18 d is provided between the lower end portion and the bottom surface of the container 2. The gap 18d can be formed, for example, by providing a groove in the axial direction on the outer surface of the flange portion 18b.

  Since the tack frame 18 is tack-welded W to the container 2 for the flange portion 18b, the heat of the bearing portion 13a during welding is higher than when the flange portion 18b is welded to the bearing portion 13a of the second support member 13 as in the prior art. Can be protected from. As a result, the bearing portion 13a is not deformed and the strength is not lowered, the bearing function is not impaired, the rotation of the rotary shaft 7 is not adversely affected, and the compressor performance can be prevented from being lowered. Further, since the tack frame 18 is made of aluminum, the weight is lighter than that of a conventional steel plate, and the weight of the compressor can be reduced. For example, the tack frame 18 can be mounted on an automobile and used as a compressor for a car air conditioner. It becomes a suitable thing to do.

  Further, a suction pipe 19 is attached to the tack frame 18, and one end of the suction pipe 19 communicates with a suction port 13c formed in the second support member 13, and the other end of the suction pipe 19 is shown in FIG. In this way, it opens to the rotary compression element 6 side.

  As shown in FIG. 1, an oil pump 20 is attached to the end of the rotary shaft 7 on the first support member 12 side. The oil pump 20 is connected to a lubricating oil reservoir at the bottom of the container 2 via a pumping pipe 21. The lubricating oil is pumped up so that the lubricating oil can be supplied to the sliding portion of the rotary compression element 5, the bearing portion 12a of the first support member 12, the bearing portion 13a of the second support member 13, and the like. For this reason, the rotating shaft 7 is provided with a shaft hole (not shown) and a plurality of oil discharge holes communicating with the shaft hole. A pedestal 22 is attached to the bottom of the sealed container 1.

The operation of the horizontal two-stage rotary compressor according to this embodiment configured as described above will be described. When the stator 5a of the electric element 5 is energized through the terminal 8, the rotor 5b rotates, and the rotary shaft 7 rotates by the rotor 5b to drive the rotary compression element 6. When a refrigerant gas (for example, CO ₂ refrigerant gas) is supplied from the introduction pipe 15, this refrigerant gas is sucked from the suction port 12 c of the first support member 12, and the cylinder 9 a of the first rotary compression element 9 The air is sucked into the low pressure chamber inside the cylinder 9a through the passage 9d.

  The refrigerant gas sucked into the low pressure chamber of the cylinder 9a is compressed by the eccentric rotation of the roller 9b inside the cylinder 9a and discharged from the outlet of the high pressure chamber to the passage (not shown) of the first support member 12. It flows into the muffler chamber 12b. The refrigerant gas silenced in the silencing chamber 12b passes through the through hole (not shown) of the first support member 12 to the cylinder 9a of the first rotary compression element 9, the partition plate 11, and the second rotary compression element 10. It is discharged to a discharge hole (not shown) formed through the cylinder 10a, the second support member 13, and the tack frame 18, and further discharged from the discharge hole through the discharge pipe 16 to the electric element 5 side. . The refrigerant gas discharged from the discharge pipe 16 to the electric element 5 side has an intermediate pressure.

  The intermediate pressure refrigerant gas contains a part of the lubricating oil, but this lubricating oil is separated from the refrigerant gas and falls and accumulates at the bottom of the sealed container 1 on the electric element 5 side. And since the said tack frame 18 is attached in the inside of the airtight container 1 and it is divided into the rotation compression element 6 side and the electric element 5 side, the internal pressure by the electric element 5 side is high, and the rotation compression element 6 side The internal pressure has a low differential pressure.

  Due to this differential pressure, the lubricating oil that drops and accumulates at the bottom of the electric element 5 side moves to the rotary compression element 6 side through the gap 18 d provided at the lower end of the tack frame 18, and passes through the tack frame 18. As a result, the oil level on the left side of the rotary compression element 6 increases. As a result, the lower end opening of the pumping pipe 21 is sufficiently immersed in the lubricating oil reservoir, so that the pumping of the lubricating oil by the oil pump 20 is performed without any trouble, and the sliding portion of the rotary compression element 6 and the like. The lubricating oil is smoothly supplied to the

  The small hole 18c is provided in the upper end portion of the tack frame 18, and the intermediate-pressure refrigerant gas discharged to the electric element 5 side moves to the rotary compression element 6 side through the small hole 18c. Since the refrigerant gas flows on the electric element 5 side by the movement of the refrigerant gas, the movement of the lubricating oil from the electric element 5 side to the rotary compression element 6 side is promoted. The amount of movement of the refrigerant gas varies depending on the size of the small hole 18, and the amount of movement increases as the diameter of the small hole 18 increases. If the amount of movement of the refrigerant gas is too large, the differential pressure between the electric element 5 side and the rotary compression element 6 side becomes small and the movement of the lubricating oil from the electric element 5 side to the rotary compression element 6 side is hindered. Further, the flow rate of the refrigerant gas also changes depending on the size of the small hole 18, and the flow rate decreases as the diameter of the small hole 18 increases. If the flow rate of the refrigerant gas is too slow, the differential pressure between the electric element 5 side and the rotary compression element 6 side is maintained, but the movement of the lubricating oil from the electric element 5 side to the rotary compression element 6 side is hindered. For this reason, it is important to set the diameter of the small hole 18c appropriately. Incidentally, in this embodiment, the diameter of the small hole 18c is set to 2 to 8 mm, and a good result is obtained.

  The intermediate-pressure refrigerant gas that has moved to the rotary compression element 6 side through the small hole 18c of the tack frame 18 is sucked from the suction pipe 19, and is formed in the second support member 13 through the suction port 13c, the second The rotary compression element 10 is sucked into the low pressure chamber of the cylinder 10a through the passage 10d formed in the cylinder 10a.

  The refrigerant gas sucked into the low pressure chamber of the cylinder 10a is compressed by the eccentric rotation of the roller 10b inside the cylinder 10a, and silenced from the passage (not shown) provided in the second support member 13 from the outlet of the high pressure chamber. It flows into the chamber 13b. The refrigerant gas silenced in the silencing chamber 13 b is discharged into the outlet pipe 17 from the discharge port 13 d formed in the second support member 13 and is discharged outside the sealed container 1.

  The refrigerant gas discharged out of the hermetic container 1 is at a high pressure, and this high pressure refrigerant gas is used as a refrigerant gas for a refrigeration cycle of an automobile air conditioner, for example. And is returned from the introduction pipe 15 to the compressor.

  The present invention can be applied not only to a horizontal two-stage rotary compressor but also to a horizontal multistage rotary compressor having three or more stages. The horizontal multistage rotary compressor according to the present invention can be used not only for automobile car air conditioners but also for home air conditioners, commercial air conditioners, other refrigerators, freezers, vending machines, and the like.

1 is a schematic longitudinal sectional view showing an embodiment in which the present invention is applied to a horizontal two-stage rotary compressor. FIG. 2 is a schematic cross-sectional view of the horizontal two-stage rotary compressor of FIG. 1. It is a schematic longitudinal cross-sectional view which shows an example of the conventional horizontal type | mold two-stage rotary compressor.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sealed container 2 Container 3, 4 End cap 5 Electric element 6 Rotation compression element 7 Rotating shaft 8 Terminal 9 1st rotation compression element 10 2nd rotation compression element 11 Partition plate 12 1st support member 13 2nd support Member 13a Bearing part 14 Cover plate 15 Inlet pipe 16 Discharge pipe 17 Outlet pipe 18 Tack frame 18b Flange part 18c Small hole 18d Clearance 19 Suction pipe 20 Oil pump 21 Pumping pipe

Claims (3)

  In a horizontal multistage rotary compressor in which an electric element and a rotary compression element driven by the electric element are arranged in a sealed container, a tack frame made of an aluminum material is used to partition the electric element and the rotary compression element. Horizontal multistage rotation characterized in that its outer peripheral edge is attached to the sealed container by welding and has a function as a baffle plate and a function as a cover plate for a muffler chamber provided in the rotary compression element. Compressor.   The horizontal multistage rotary compressor according to claim 1, wherein a small hole is provided in the tack frame, and the electric element side and the rotary compression element side are communicated to generate a differential pressure.   The horizontal multistage rotary compressor according to claim 2, wherein the small hole has a diameter of 2 to 8 mm.

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