JP2005214110A - Compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compressor with a sealed container formed by welding a metal end cap to a metal container while conducting welding heat almost equally to the side of the container and to the side of the end cap. <P>SOLUTION: To an opening end 2c of the container of an aluminum material, a shoulder portion 3c of the end cap 3 of an aluminum material is arc-welded to form the sealed container, while conducting the arc-heat almost equally to the side of the end cap and to the side of the container when emitting arc to an opening edge G. t≤H≤4t is established between a height H of the shoulder portion 3c from the opening edge and a plate thickness t of the opening end 2c. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a compressor, and more particularly to a compressor that forms a sealed container by welding a metal end cap to an open end of a metal container.

Conventionally, a compressor in which an electric element and a compression element are housed in a hermetic container is known. In this type of compressor, the hermetic container is generally made of iron. If a closed container made of iron is used, the overall weight of the compressor increases, which may not be suitable depending on the purpose of use. For example, when it is mounted on an automobile and used as a compressor for a refrigeration cycle of an air conditioner, a heavy compressor is not preferable because it increases the total weight of the automobile and increases fuel consumption. For this reason, it has been proposed to reduce the weight by replacing the hermetic container of the compressor with that of an aluminum material (for example, Patent Document 1, Patent Document 2, etc.).
JP 2002-174179 A JP 2002-13475 A

  In order to replace the sealed container of the compressor with an aluminum material, means for bolting or welding a substantially cylindrical container and a substantially disk-shaped or bowl-shaped end cap is employed. In the case of using welding means, arc welding is common, and the joint portion formed by arc welding must have sufficient strength to withstand high pressure as a sealed container. The same applies to the case where a sealed container formed of another metal such as an iron material is formed by welding, and a joint portion by welding is required to have high pressure resistance as a sealed container.

  When forming an airtight container by arc welding, it is desirable that heat generated by arc discharge is applied substantially uniformly to the container side and the end cap side in the overlapping portion between the container and the end cap. For this reason, for example, a thin edge piece is formed in the circumferential direction at the opening end of the container, and a thin back plate is formed at the end of the end cap. The container is press-fitted into the opening end of the container and polymerized into an edge piece, and the superposed part is heated and melted almost uniformly and welded.

  However, even in the case of arc welding in consideration of heat balance, the portion (usually the shoulder portion) that follows the back plate portion of the end cap and the portion that follows the edge piece at the open end of the container are in heat conduction. In some cases, the arc heat may not be conducted evenly between the container side and the end cap side. When such a situation occurs, not only arc welding becomes unstable, but also a welding strength sufficient to withstand high pressure as a sealed container cannot be obtained.

  The present invention has been made to solve the above-described problems of the prior art, and in forming a sealed container by welding a metal end cap to a metal container, heat during welding is generated on the container side. It is an object of the present invention to provide a compressor that conducts almost uniformly to the end cap side.

  In order to achieve the above object, claim 1 of the present invention is a compressor that forms a sealed container by welding a metal end cap to an open end of a metal container, wherein the end cap is A shoulder is provided on the outer periphery, and when the shoulder and the open end of the container are welded, the height of the shoulder and the container are set so that heat is conducted substantially evenly between the end cap and the container. The thickness of the opening end of each is set.

  According to a second aspect of the present invention, in the first aspect, the height of the shoulder portion is set to 1 to 4 times the plate thickness of the opening end portion of the container.

  According to the first aspect of the present invention, in the compressor for forming a sealed container by welding a metal end cap to the open end of the metal container, the shoulder provided on the end cap and the open end of the container , The height of the shoulder of the end cap and the plate thickness of the open end of the container are set so that heat is conducted almost evenly between the end cap and the container, so that stable welding can be obtained. At the same time, a weld strength sufficient to withstand high pressure as a sealed container can be obtained.

  According to the invention of claim 2, in claim 1, the height of the shoulder is set to 1 to 4 times the plate thickness of the opening end of the container, and the heat capacity is adjusted to be equal. Therefore, heat can be conducted substantially uniformly between the end cap side and the container side during welding.

  Next, an embodiment of a compressor according to 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 an internal intermediate pressure type two-stage rotary compressor. FIG. 2A is a partial cross-sectional view showing a state before the sealed container is welded in the two-stage rotary compressor of FIG. 1 and before the end cap is press-fitted into the open end of the container. (B) is a fragmentary sectional view which shows the state which press-fitted the end cap into the opening edge part of the container. FIG. 3 is a partial schematic longitudinal sectional view showing a welded portion between the container and the end cap.

  In FIG. 1, reference numeral 1 denotes an airtight container, which is composed of a container 2 formed of an aluminum material and an end cap 3 formed of an aluminum material joined to an opening end of the container 2 by welding W. In the container 2, an electric element 4 and a rotary compression element 5 driven by the electric element 4 are accommodated. As the aluminum material, for example, an aluminum alloy containing Si, Mg, or Cu can be used.

  The electric element 4 is composed of a stator 4a fixed to the inner wall surface of the container 2, and a rotor 4b disposed at a slight interval in the center of the stator 4a. The center of the rotor 4b is a rotating shaft. 6 and the lower part of the rotating shaft 6 extends vertically downward.

  The rotary compression element 5 includes a first rotary compression unit 7 and a second rotary compression unit 8 disposed thereon via a partition plate 9. The first rotary compression unit 7 is a first rotary compression unit 7. 1 cylinder 10, and a first roller 11 that eccentrically rotates inside the first cylinder 10 by being fitted to a first eccentric portion 6 a provided on the rotary shaft 6, The rotary compression unit 8 includes a second cylinder 12 and a second roller 13 that is fitted into a second eccentric portion 6 b provided on the rotary shaft 6 and rotates eccentrically inside the second cylinder 12. ing. Further, a vane (not shown) urged by a spring is always in contact with the first roller 11 so that the interior of the first cylinder 10 is divided into a low pressure chamber and a high pressure chamber. The second roller 12 is partitioned into a low-pressure chamber and a high-pressure chamber by a vane (not shown) biased by a spring constantly contacting the second roller 13. The first eccentric portion 6a and the second eccentric portion 6b provided on the rotating shaft 6 are shifted in phase by 180 °.

  In addition, a first support member 14 is disposed below the first rotary compression unit 7, and a second support member 15 is disposed above the second rotary compression unit 8. The first support member 14 and the second support member 15 are configured such that the first rotary compression portion 7, the partition plate 9, and the second rotary compression portion 8 are sandwiched between the inner wall surface of the container 2. The main frame 16 is fixed integrally to the main frame 16 by tightening with a plurality of bolts 16a.

  The first support member 14 has a bearing portion 14a at the center, and a bush is fitted inside the bearing portion 14a to support the lower end portion of the rotary shaft 6. Further, a silencing chamber 14b is provided on the lower surface side of the first support member 14 along the outer periphery of the bearing portion 14a. The silencing chamber 14b communicates with the outlet of the high-pressure chamber in the first cylinder 10. The discharge port 14c provided in the first support member 14 communicates with the discharge port 14c. The silencing chamber 14b is covered with an opening surface by a cover plate 17 fixed to the lower surface of the first support member 14 with bolts 17a, and a hole 17b is provided in the center of the cover plate 17 corresponding to the bearing portion 14a. Yes. Further, the first support member 14 is provided with a suction port 14d, and this suction port 14d communicates with an inlet of a low pressure chamber in the first cylinder 10 through a passage 10a provided in the first cylinder 10. doing. The rotary shaft 6 is provided with a shaft hole 6c, the lower end portion of which is expanded in diameter, and a lubricating oil pumping member 18 is mounted therein.

  The second support member 15 has a bearing portion 15a at the center, and this bearing portion 15a projects upward through the center hole of the main frame 16, and a bush is fitted inside the bearing portion 15a. The rotary shaft 6 is supported. Further, a silencing chamber 15b is provided on the upper surface side of the second support member 15 along the outer periphery of the bearing portion 15a. The silencing chamber 15b communicates with the outlet of the high pressure chamber in the second cylinder 12. The discharge port 15c provided in the second support member 15 communicates with the discharge port 15c. Further, the second support member 15 is provided with a suction port 15d, and the upper end of the suction port 15d communicates with the inside of the container 2 via a suction passage 16b provided in the main frame 16. The lower end of the suction port 15 d communicates with the inlet of the low pressure chamber in the second cylinder 12 through a passage 12 a provided in the second cylinder 12. The main frame 16 is provided with a discharge passage 16c. The discharge passage 16c communicates a region below the main frame 16 and a region above the main frame 16 inside the container.

  The container 2 is provided with a suction side hole 2a in a side wall portion facing the suction port 14d of the first support member 14, and a sleeve 19 is fixed to the position of the suction side hole 2a by a bolt 19a. The side wall of the second support member 15 facing the discharge port 14c is provided with a discharge-side hole 2b, and the sleeve 20 is fixed to the position of the discharge-side hole 2b by a bolt 20a.

  The suction side sleeve 19 is connected to the inner end portion of the hole 19b and the inlet end portion of the suction port 14d by a suction communication pipe 21, and is connected to the suction communication pipe 21 on the sleeve 19 side for airtightness. An O-ring is fitted to the connection portion, and a bush is fitted to the connection portion with the suction communication pipe 21 on the suction port 14d side. A refrigerant gas introduction pipe (not shown) is connected to the suction side sleeve 19.

  The discharge-side sleeve 20 has an inner end portion of the hole 20b and an outlet end portion of the discharge port 15c connected to each other by a discharge communication tube 22, and the sleeve 20 side is connected to the discharge communication tube 22 to maintain airtightness. An O-ring is fitted to the connection portion, and a bush is fitted to the connection portion with the discharge communication pipe 22 on the discharge port 15c side. A refrigerant gas outlet pipe (not shown) is connected to the discharge-side sleeve 20.

  The end cap 3 is provided with a hole 3a in the center, and a terminal 23 is fixed to the position of the center hole 3a by a bolt 3b. The terminal 23 includes a base 23a for attachment to the end cap 3, and a plurality of connection terminals 23c that are fixed to the base 23a through an electrical insulating material 23b such as a glass material or an epoxy resin. The lower end portion of the terminal 23c is connected to the stator 4a of the electric element 4 via an internal lead wire (not shown), and the upper end portion of the connection terminal 23c is connected to an external power source via an external lead wire (not shown). The

  The end cap 3 is connected to the stator 4a by attaching the terminal 23, and then press-fitted into the open end portion of the container 2, and the overlapped portion is fixed by arc welding to constitute the sealed container 1.

  FIG. 2A is a partial cross-sectional view showing a state before the end cap 3 is press-fitted into the open end 2c of the container 2, and the end cap 3 is provided with a shoulder 3c on the outer periphery thereof. A back plate portion 3d is erected along the circumferential direction on the lower surface side of the shoulder portion 3c. Further, an inwardly tapered surface 3e is provided along the circumferential direction at a lower portion of the outer peripheral surface of the shoulder portion 3c, and a protruding step portion is provided in a boundary region between the tapered surface 3e and the outer peripheral surface of the back plate portion 3d. 3f is also provided along the circumferential direction.

  The container 2 is provided with an inwardly tapered surface 2d along the circumferential direction at the upper part of the outer peripheral surface of the opening end 2c, and a thin, low-profile edge piece 2e is formed inside the tapered surface 2d. It is erected on the peripheral side.

  Prior to arc welding, the end cap 3 is press-fitted into the open end 2 c of the container 2. The outer diameter of the back plate portion 3d in the end cap 3 is set to be slightly larger than the inner diameter of the opening end portion 2c of the container 2, and the end cap is pressed into the inner end of the opening end portion 2c. 3 is fitted into the open end 2 c of the container 2.

  FIG. 2B shows a state in which the end cap 3 is press-fitted into the open end 2c of the container 2, and the edge piece 2e of the container 2 abuts on the protruding step 3f of the end cap 3 and is received. An overlap portion of the cap 3 and the container 2 is formed, and a groove having a substantially V-shaped cross section is formed by the tapered surface 3e and the protruding step portion 3f of the end cap 3, and the tapered surface 2d and the edge piece 2e of the container 2. G (groove) is formed along the circumferential direction.

  Next, the overlap portion between the end cap 3 and the container 2 is arc welded. As arc welding, for example, MIG welding or TIG welding is suitable for work. In this arc welding, an arc is emitted toward the bottom of the groove G to melt the overlapping portion of the end cap 3 and the container 2 and to melt the core wire into the groove G.

  In the present invention, the heat capacity is adjusted so that arc heat is conducted substantially uniformly to the end cap 3 side and the container 2 side during arc welding. In order to adjust this heat capacity, for example, when the height H from the groove G of the shoulder 3c in the end cap 3 is t, and the plate thickness of the open end 2c in the container 2 is t, it is 1 to 4 times (t ≦ H ≦ 4t). When the height H from the groove G of the shoulder 3c is less than the plate thickness t of the opening end 2c, the heat capacity on the shoulder 3c side is reduced and the arc heat is on the shoulder 3c side from the opening end 2c side. When the thickness t exceeds 4 times the thickness t of the open end 2c, the heat capacity on the open end 2c side decreases, and more arc heat is transferred from the shoulder 3c side to the open end 2c side. The heat capacity will not be balanced.

  In this embodiment, the plate thickness of the opening end 2c of the container 2 is 4.5 mm, and the height H from the groove G of the shoulder 3c in the end cap 3 is set to 12.2 mm and is about 2.7 times. It is as. As a result, arc heat is conducted substantially uniformly between the end cap 3 side and the container 2 side during arc welding, and a stable welding is obtained by heating and melting the overlapped portion almost uniformly, and together with the melt of the core wire, Since the groove G is appropriately built up, the strength of the weld W portion is increased. Therefore, the sealed container 1 that can sufficiently withstand high pressure can be obtained.

  In the present embodiment, arc welding between a container and an end cap, both of which are formed of an aluminum material, has been described. However, the present invention can be similarly applied to a case of being formed of another metal such as an iron material. In the above description, a groove G is formed and arc welding is performed along the groove G. However, the present invention can also be applied to a case of a fillet without a groove.

  Since the two-stage rotary compressor according to the present invention configured as described above is lighter than a compressor using a conventional closed steel container, for example, it is mounted on an automobile and used as a compressor for a refrigeration cycle of a car air conditioner It will be suitable for use.

  Next, the operation of the two-stage rotary compressor according to the present invention will be described. When the stator 4a of the electric element 4 is energized through the terminal 23, the rotor 4b rotates, and the rotation shaft 6 rotates by the rotation of the rotor 4b to drive the rotary compression element 5. When the rotary compression element 5 is driven, the refrigerant gas is drawn into the suction port 14d of the first support member 14 through the refrigerant gas introduction pipe connected to the suction side sleeve 19 and the suction communication pipe 21.

  The refrigerant gas sucked into the suction port 14 d of the first support member 14 is sucked into the low pressure chamber of the first cylinder 10 through the passage 10 a of the first cylinder 10 in the first rotary compression unit 7. In the first cylinder 10, the first roller 11 fitted to the first eccentric portion 6 a of the rotating shaft 6 rotates eccentrically and compresses the refrigerant gas. The compressed refrigerant gas is discharged from the high pressure chamber of the first cylinder 10 to the silencer chamber 14b of the first support member 14, and after being silenced here, is discharged from the discharge port 14c to a lower region inside the container. The discharged compressed refrigerant gas is discharged through the discharge side passage 16c of the main frame 16 to the upper region inside the container.

  The refrigerant gas compressed by the first rotary compression unit 7 and discharged to the upper region inside the container has an intermediate pressure. The refrigerant gas at the intermediate pressure is supplied from the suction passage 16b of the main frame 16 to the second passage. The air is sucked into the suction port 15d of the support member 15. The intermediate-pressure refrigerant gas sucked into the suction port 15 d of the second support member 15 is sucked into the low pressure chamber of the second cylinder 12 through the passage 12 a of the second cylinder 12 in the second rotary compression unit 8. Is done. In the second cylinder 12, the second roller 13 fitted to the second eccentric portion 6b of the rotating shaft 6 rotates eccentrically and compresses the refrigerant gas. The compressed refrigerant gas is discharged from the high-pressure chamber of the second cylinder 12 to the silencer chamber 15b of the second support member 15, and after being silenced, is discharged from the discharge port 15c and is connected to the discharge communication pipe 22. Then, the refrigerant gas is discharged to the outside of the container by a refrigerant gas outlet tube connected to the discharge-side sleeve 20. The refrigerant gas discharged to the outside of the container is compressed by the second rotary compression unit 8 and has a high pressure. This high-pressure refrigerant gas is used, for example, as a refrigerant gas for a refrigeration cycle of an automobile air conditioner, and after going through the refrigeration cycle, becomes a low-pressure refrigerant gas and is returned from the suction sleeve 19 to the compressor.

  The present invention is effective when applied to a compressor that forms a sealed container by welding a metal end cap to an opening end of a metal container. Further, the present invention is not only applied to an internal intermediate pressure type two-stage rotary compressor, but also applied to a multistage rotary compressor having three or more stages, an internal high-pressure type single-stage rotary compressor, and other various types of compressors. Is possible. Furthermore, the compressor according to the present invention can be used not only for automobile 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 an internal intermediate pressure type two-stage rotary compressor. (A) is a partial cross-sectional view showing the state before the sealed container is welded in the two-stage rotary compressor of FIG. 1 and before the end cap is press-fitted into the open end of the container. (B) is a fragmentary sectional view which shows the state which press-fitted the end cap into the opening edge part of the container. It is a schematic longitudinal cross-sectional view which shows the welding part of a container and an end cap.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Airtight container 2 Container 2c Open end part 3 End cap 3c Shoulder part 4 Electric element 5 Rotation compression element 6 Rotating shaft 7 1st rotation compression part 8 2nd rotation compression part 9 Partition plate 14 1st support member 15 1st 2 support members 16 main frame 23 terminal

Claims (2)

  A compressor for forming a sealed container by welding a metal end cap to an opening end of a metal container, wherein the end cap is provided with a shoulder on an outer peripheral portion, and the shoulder and the opening of the container When welding the end portion, the height of the shoulder portion and the plate thickness of the open end portion of the container are set so that heat is conducted substantially evenly between the shoulder portion and the open end portion of the container. Compressor.   The compressor according to claim 1, wherein the height of the shoulder is set to 1 to 4 times the thickness of the opening end of the container.

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