JP2005226610A - Sealed vessel for compressor and compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To remarkably improve durability, by improving welding strength, even when using a welding difficult material such as aluminum, in a sealed vessel for a compressor formed by welding and fixing the whole periphery of an end cap to a vessel body, by blocking up an opening of the vessel body by the end cap. <P>SOLUTION: This sealed vessel 12 for the compressor welds and fixes the whole periphery of the end cap 12B to the vessel body 12A by blocking up the opening of the vessel body 12A by the end cap 12B. A groove of a groove part 72 composed of the vessel body 12A and the end cap 12B is welded. This groove dimension is set to 50 % to 200 % of a thickness dimension of a minimum thickness part among the vessel body 12A and the end cap 12B. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an airtight container for a compressor and a compressor in which an opening of a container body is closed with an end cap and the entire circumference of the end cap is welded and fixed to the container body.

  Conventionally, this type of airtight container for a compressor is made of a steel plate. The airtight container includes a container body that houses an electric element or a compression element as a driving element, and a hermetic lid (end) that closes the opening of the container body. Cap). Then, the container body is superposed so that the container main body is located outside the end cap, and the superposed container is assembled by fillet welding the superposed portion.

  When a compressor equipped with such a sealed container is mounted in a vehicle engine room for air conditioning of a vehicle such as an electric vehicle (HEV or PEV), the weight of the compressor affects the vehicle weight. As a result, there arises a problem that the fuel consumption of the automobile is lowered. Therefore, a compressor useful for a car air conditioner in which a hermetic container is formed of, for example, an aluminum material to reduce the weight has been proposed.

In this case as well, a cylindrical container body (housing) made of an aluminum material and an end cap (lid member) made of an aluminum material, which closes both end openings of the container main body, are sealed by welding. That is, the method for welding the sealed container is the same as the compressor sealed container made of steel plate, the container body is polymerized so that it is outside the end cap, and the entire circumference of the overlapped part is welded to fill the container body. The end cap was integrated to form a sealed container. (See Patent Document 1)
JP 2002-174179 A

  However, although aluminum has the advantage of being significantly lighter than steel, it has a very high thermal conductivity compared to steel, making it easier to melt during welding, and heat is transmitted to other areas than it is durable. There is a problem that the performance deteriorates. Further, it is difficult to secure the welding strength freely as compared with the steel plate, and there is a problem particularly in the case of a compressor using a carbon dioxide refrigerant or the like in which the internal pressure becomes high. For this reason, the container body and the end cap have been bolted in the past, but the assembly workability is poor, the mass increases and the number of parts increases, and there is also a problem in strength and airtightness. It was.

  The present invention has been made to solve the problems of the related art, and is for a compressor in which an opening of a container body is closed with an end cap and the entire circumference of the end cap is welded and fixed to the container body. Even in the case of using a difficult-to-weld material such as aluminum in a sealed container, the object is to improve the welding strength and remarkably improve the durability.

  That is, the airtight container for a compressor according to the first aspect of the present invention is formed by closing an opening of a container body with an end cap and welding and fixing the entire circumference of the end cap to the container body. The cap is fixed by groove welding, and the groove dimension of the groove portion constituted by the container body and the end cap is 50% or more of the thickness dimension of the minimum thickness portion of the container body and the end cap. It is characterized by being 200% or less.

  An airtight container for a compressor according to a second aspect of the present invention is formed by closing an opening of a container main body with an end cap, and welding and fixing the entire circumference of the end cap to the container main body. While fixing by groove welding, the groove dimension of the groove part comprised by a container main body and an end cap shall be 2 mm or more and 10 mm or less.

  An airtight container for a compressor according to a third aspect of the present invention is formed by closing an opening of a container body with an end cap, and welding and fixing the entire circumference of the end cap to the container body. While fixing by groove welding, the container main body and end cap which comprise a groove part were formed in the thick part 5 mm or more.

  According to a fourth aspect of the present invention, there is provided a sealed container for a compressor in which an opening of a container main body is closed with an end cap, and the entire circumference of the end cap is welded and fixed to the container main body. While fixing by groove welding, the thickness of the welded portion of the container body constituting the groove portion is t1, and the thickness of the joint portion of the container body that is polymerized outside the end cap at the groove portion is t2. When the thickness of the back plate of the end cap that is polymerized inside the joint of the container body is t3, and the minimum wall thickness of the container body is t, t1 is 120% to 150% of t, and t2 is t1. 10% or more and 30% or less, and t3 is twice t2.

  According to a fifth aspect of the present invention, there is provided a sealed container for a compressor in which an opening of a container main body is closed with an end cap, and the entire circumference of the end cap is welded and fixed to the container main body. In addition to fixing by groove welding, a groove is formed over the entire circumference on the surface on the container body side of the back plate portion of the end cap that overlaps inside the container body at the groove portion.

  The airtight container for a compressor according to a sixth aspect of the present invention is characterized in that, in each of the above-mentioned inventions, the container main body and the end cap are composed of parts mainly made of aluminum.

  According to a seventh aspect of the present invention, there is provided a compressor using the airtight container for a compressor according to each of the above inventions, wherein the airtight container is provided with a drive element and a compression element driven by the drive element. It is characterized by comprising a first compression element that sucks and compresses and discharges it into the sealed container, and a second compression element that sucks and compresses the carbon dioxide refrigerant in the sealed container.

  According to the first aspect of the present invention, in a sealed container for a compressor in which the opening of the container body is closed with an end cap and the entire circumference of the end cap is welded and fixed to the container body, the container body and the end cap are welded to the groove. Therefore, even when the container body and the end cap are made of aluminum having high thermal conductivity as in claim 6, the welding area can be expanded to ensure sufficient welding strength. become.

  In particular, the groove dimension of the groove portion constituted by the container body and the end cap is set to be 50% or more and 200% or less of the thickness dimension of the minimum thickness portion of the container body and the end cap. It is possible to effectively avoid the disadvantage that the container body or the end cap constituting the groove portion is dissolved by the heat or the durability is lowered. As a result, the weight of the sealed container can be reduced and the assembly workability can be improved, and the strength can be secured without any trouble.

  Also in the invention of claim 2, in the closed container for a compressor in which the opening of the container main body is closed with an end cap and the entire circumference of the end cap is welded and fixed to the container main body, the container main body and the end cap are grooved. Since the groove dimension of the groove portion constituted by the container main body and the end cap is 2 mm or more and 10 mm or less while being fixed by welding, the container main body and the aluminum body having high thermal conductivity as in claim 6. Even when the end cap is configured, the welding area can be increased to ensure sufficient welding strength. Thereby, strength can be secured while reducing the weight of the sealed container and improving the assembly workability.

  Further, in the invention of claim 3, in the sealed container for a compressor in which the opening of the container main body is closed with an end cap and the entire circumference of the end cap is welded and fixed to the container main body, the container main body and the end cap are opened. Since it is fixed by welding, even when the container body and the end cap are made of aluminum having high thermal conductivity as in claim 6, the welding area can be expanded to ensure sufficient welding strength. become able to.

  In particular, since a thick portion of 5 mm or more is formed on the container main body and end cap constituting the groove portion, the container main body or end cap constituting the groove portion is melted by heat during welding, or durability is increased. The reduced inconvenience can be effectively avoided. As a result, the weight of the sealed container can be reduced and the assembly workability can be improved, and the strength can be secured without any trouble.

  Further, in the invention of claim 4, in a sealed container for a compressor in which the opening of the container main body is closed with an end cap and the entire circumference of the end cap is welded and fixed to the container main body, the container main body and the end cap are grooved. Since it is fixed by welding, even when the container body and the end cap are made of aluminum having high thermal conductivity as in claim 6, the welding area can be expanded to ensure sufficient welding strength. become able to.

  In particular, the thickness of the welded portion of the container body constituting the groove portion is t1, the thickness of the joint portion of the container body that is polymerized on the outside of the end cap at the groove portion is t2, the inside of the joint portion of the container body. T1 is 120% or more and 150% or less of t, and t2 is 10% or more and 30% or less of t1, where t3 is the thickness of the back plate of the end cap that is polymerized to t3, and t is the minimum thickness of the container body. Since t3 is set to be twice t2, it is possible to prevent inconvenience that spatter and the like are mixed into the sealed container through the joint portion of the container body to be polymerized and the back plate portion of the end cap while being welded. It becomes like this. As a result, it is possible to secure strength and prevent spatter mixing while reducing the weight of the sealed container and improving the assembly workability.

  Further, in the invention of claim 5, in a sealed container for a compressor in which the opening of the container body is closed with an end cap and the entire circumference of the end cap is welded and fixed to the container body, the container body and the end cap are separated from each other. Since it is fixed by welding, even when the container body and the end cap are made up of parts mainly made of aluminum with high thermal conductivity as in claim 6, the welding area is expanded and sufficient welding is achieved. Strength can be secured.

  In particular, a groove is formed on the container body side surface of the back plate of the end cap that overlaps inside the container body at the groove, so that spatter penetrates through the container body during welding. However, since it fits in the groove formed in the back plate portion of the end cap, it is possible to prevent inconvenience that the spatter enters the sealed container. As a result, it is possible to secure strength and prevent spatter mixing while reducing the weight of the sealed container and improving the assembly workability.

  Further, in the invention of claim 7, the compressor sealed container of claim 1, claim 2, claim 3, claim 4, claim 5 or claim 6 is used, and the driving element and the drive are placed in the sealed container. A compression element driven by the element is provided, and the compression element sucks and compresses the carbon dioxide refrigerant, and sucks and compresses the first compression element discharged into the sealed container and the carbon dioxide refrigerant in the sealed container. Since the compressor is composed of the second compression element, the inside of the sealed container has an intermediate pressure, so that the sealed container only needs to have a pressure resistance characteristic substantially equal to that of the low-pressure part. (HEV and PEV), etc., even when installed in the vehicle engine room for air conditioning of the interior of the vehicle, the weight of the compressor is less affected by the weight of the vehicle than in the past, and the vehicle fuel efficiency is improved. The aim of, in which it is possible to suitably such an electric vehicle.

  A feature of the present invention is that, when a sealed container for a compressor is configured, the container body and the end cap are fixed by groove welding in order to prevent a decrease in the strength of the welded portion between the container body and the end cap, The dimensional relationship of the members is set to an optimum value. Hereinafter, the embodiment will be described in detail.

  Next, an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 shows an embodiment of a compressor using a sealed container 12 for a compressor according to the present invention, an internal intermediate pressure type multistage (two-stage) compression rotary rotary equipped with first and second compression elements 32 and 34 in the sealed container 12. 2 is a longitudinal side view of the compressor 10. FIG.

The rotary compressor 10 of the embodiment is an internal intermediate pressure type multi-stage (two-stage) compression type rotary compressor that uses carbon dioxide (CO ₂ ) as a refrigerant. The rotary compressor 10 is made of aluminum (made of aluminum as shown in FIG. 1). Means a main part made of aluminum (hereinafter the same), and a substantially disk-shaped aluminum end cap 12B fitted inside so as to close the upper end opening of the container main body 12A. A substantially cylindrical sealed container 12 composed of a (sealed lid), a drive element 14 arranged and housed above the internal space of the sealed container 12, and a lower side of the drive element 14 The first compression element 32 (first stage) and the second pressure as the compression elements that are arranged in the cylinder and are driven by the rotating shaft 16 of the drive element 14 And a rotary compression mechanism portion 18 for of elements 34 (second stage). A method for joining the container body 12A and the end cap 12B constituting the sealed container 12 will be described in detail later.

  A circular mounting hole 12D is formed in the center of the upper surface of the end cap 12B, and a terminal (wiring is omitted) 20 for supplying power to the drive element 14 is provided in the mounting hole 12D via a packing (not shown). It is fixed from the outside by a plurality of screws 20A. That is, the periphery of the terminal 20 is fixed to the upper surface of the end cap 12B through a packing (not shown) with a plurality of screws 20A (FIG. 2). A plurality of electrical terminals 19 are connected to the terminal 20 so as to connect wiring.

  The drive element 14 includes a stator 22 that is annularly attached along the inner peripheral surface of the upper space of the sealed container 12, and a rotor 24 that is inserted and arranged with a slight gap inside the stator 22. Yes. The rotor 24 is fixed to a rotating shaft 16 that extends in the vertical direction through the center of the sealed container 12.

  The stator 22 includes a laminate (stator core) 26 in which donut-shaped electromagnetic steel plates are laminated, and a stator coil 28 wound around the teeth of the laminate 26 by a direct winding (concentrated winding) method. Similarly to the stator 22, the rotor 24 is also formed by a laminated body (rotor core) 30 of electromagnetic steel plates, and a permanent magnet MG is inserted into the laminated body 30.

  The first compression element 32 and the second compression element 34 include an intermediate partition plate 36 sandwiched therebetween, a cylinder 38 and a cylinder 40 disposed above and below the intermediate partition plate 36, and the upper and lower cylinders 38. , 40 are fitted to upper and lower eccentric parts 42 and 44 provided on the rotary shaft 16 with a phase difference of 180 degrees, and the upper and lower rollers 46 and 48 are rotated eccentrically. The upper and lower vanes (not shown) that divide the upper and lower cylinders 38 and 40 into a low-pressure chamber side and a high-pressure chamber side, and the upper opening surface of the cylinder 38 and the lower opening surface of the cylinder 40 are closed. The upper support member 54 and the lower support member 56 that also serve as bearings for the rotary shaft 16 are configured.

  The upper support member 54 and the lower support member 56 are formed with suction passages communicating with the insides of the upper and lower cylinders 38 and 40 at the suction ports 161 and 162, respectively, and recessed discharge silencing chambers 62 and 64. The discharge silencing chamber 62 is closed by an upper cover 66 and the discharge silencing chamber 64 is closed by a lower cover 68.

  A bearing 54A is formed upright at the center of the upper support member 54, and a cylindrical bush 122 is attached to the inner surface of the bearing 54A. Further, a bearing 56A is formed through the center of the lower support member 56, and a cylindrical bush 123 is mounted on the inner surface of the bearing 56A. The bushes 122 and 123 are made of a material having good slidability, and the rotating shaft 16 is held by the bearings 54A of the upper support member 54 and the bearings 56A of the lower support member 56 through the bushes 122 and 123. .

  The lower cover 68 is made of a donut-shaped circular steel plate, and is fixed to the lower support member 56 from below by main bolts 129 at the four peripheral portions, and the first compression element 32 is discharged from a discharge port (not shown). The lower opening of the discharge silencing chamber 64 communicating with the inside of the cylinder 40 is closed. The tip of the main bolt 129 is screwed into the upper support member 54.

  The discharge silencer chamber 64 and the inside of the sealed container 12 on the drive element 14 side are communicated with each other through a communication passage 171 that penetrates the upper and lower cylinders 38 and 40 and the intermediate partition plate 36. The intermediate pressure refrigerant compressed by the first compression element 32 is discharged into the sealed container 12.

  The upper cover 66 closes the upper opening of the discharge silencer chamber 62 communicating with the inside of the upper cylinder 38 of the second compression element 34 at a discharge port (not shown), and the discharge silencer chamber 62 is sealed in the sealed container 12. And the drive element 14 side. The upper cover 66 is formed of a substantially donut-shaped circular steel plate in which a hole through which the bearing 54A of the upper support member 54 passes is formed, and the peripheral portion is fixed to the upper support member 54 from above by four main bolts 78. Has been. The front end of the main bolt 78 is screwed into the lower support member 56. The peripheral edge portion of the upper cover 66 stands on the drive element 14 side, and the outer peripheral surface thereof is fixed to the inner surface of the container main body 12A by shrink fitting.

  In the intermediate partition plate 36 that closes the lower opening surface of the cylinder 38 and the upper opening surface of the cylinder 40, the outer peripheral surface and the inner peripheral surface are communicated with each other at a position corresponding to the suction side in the cylinder 38. A through hole 131 constituting an oil supply passage is formed. The opening on the outer peripheral surface side of the through hole 131 is sealed with a press-fitting sealing material 132. A communication hole 133 extending upward is formed in the middle of the through hole 131.

  On the other hand, a communication hole 134 communicating with the communication hole 133 of the intermediate partition plate 36 is formed in the suction port 161 (suction side) of the cylinder 38. Further, in the rotating shaft 16, lateral oil supply holes 82 and 84 (also formed in the upper and lower eccentric portions 42 and 44 of the rotating shaft 16) communicating with an oil hole 80 provided in the vertical direction around the shaft center. Is formed. The opening on the inner peripheral surface side of the through hole 131 of the intermediate partition plate 36 communicates with the oil hole 80 through these oil supply holes 82 and 84.

  Since the inside of the airtight container 12 has an intermediate pressure as will be described later, it is difficult to supply oil into the upper cylinder 38, which is at a high pressure in the second stage. The oil pumped up from the oil sump at the bottom of the container 12 is raised through the oil hole 80, and the oil exiting from the oil supply holes 82 and 84 enters the through hole 131 of the intermediate partition plate 36, and passes through the communication holes 133 and 134 to the upper cylinder 38. To the suction side (suction port 161).

  On the side surface of the container main body 12A of the sealed container 12, a sleeve 142 is fixed to a position corresponding to the suction passage of the lower support member 56 with a plurality of bolts 144 (only one is shown in the present embodiment) via the packing 142A. At the same time, the sleeve 143 is fixed to the position corresponding to the discharge silencer chamber 62 (the position corresponding to the substantially lower end of the drive element 14) with a plurality of bolts 145 (two shown in this embodiment) via the packing 143A. The inside of the sealed container 12 (a position substantially corresponding to the lower end of the drive element 14) communicates with the suction passage of the cylinder 38 through a refrigerant passage (not shown) formed in the side wall thickness of the container body 12A.

  Further, one end of a refrigerant introduction pipe (not shown) for introducing refrigerant gas into the cylinder 40 is inserted and connected into the sleeve 142, and one end of the refrigerant introduction pipe is communicated with the cylinder 40 via a suction passage. Although not shown, the other end of the refrigerant introduction pipe is connected to the evaporator via an accumulator that performs gas-liquid separation. Further, a refrigerant discharge pipe (not shown) is inserted and connected into the sleeve 143, and one end of the refrigerant discharge pipe is communicated with the discharge silencer chamber 62.

  With the above configuration, when the driving element 14 is powered and operated via the electrical terminal 19 of the terminal 20, the low-pressure (about 3 MPa) carbon dioxide refrigerant sucked into the cylinder 40 of the first compression element 32 is It is compressed by the action of the roller 48 and the vane, and discharged from the discharge silencer chamber 64 through the communication path 171 into the sealed container 12. The intermediate pressure (about 8 MPa) refrigerant in the hermetic container 12 is sucked into the cylinder 38 of the second compression element 34 through the refrigerant passage described above, and is compressed by the action of the roller 46 and the vane to obtain a high pressure (about 12 MPa). Thus, the refrigerant is discharged through the discharge silencer chamber 62 to the refrigerant discharge pipe described above.

  Next, the joining of the container body 12A and the end cap 12B constituting the sealed container 12 will be described. In this case, as shown in FIG. 3, the sealed container 12 is expanded at an angle of 30 to 120 degrees, preferably about 60 degrees as it goes to the tip (outside) around the entire welded portion between the container body 12A and the end cap 12B. A groove portion 72 having a substantially V-shaped cross section is formed. A groove dimension L1 of this groove part 72 (opening dimension of the tip 72A of the groove part 72 shown in FIG. 3) is 2 mm or more and 10 mm or less, and 6 mm in the embodiment. Part) is a predetermined dimension plane.

  The groove dimension L1 is 50% or more of the thickness dimension of the smallest thickness portion (in the embodiment, the smallest thickness portion of the container body 12A) that is the thinnest of the container body 12A and the end cap 12B. It is good to set in the range of 200% or less. And the said dimension of 2 mm or more and 10 mm or less is stored in this range. In addition, the upper part of the container body 12A and the end cap 12B are designed so that the outer dimensions are substantially the same in a state where they are joined to each other, and in particular, the end cap 12B constituting the upper and lower sides of the groove portion 72 is designed. The dimension L2 of the thick part (the part having a large thickness) and the dimension L3 of the thick part of the container body 12A are secured to 5 mm or more (in the embodiment, L2 is 15 mm, L3 is 25 mm).

  Further, in this case, a back plate portion 13 having a predetermined thickness is provided at the lower end portion of the end cap 12B so as to be inserted inside the upper end opening of the container main body 12A and overlap in the horizontal direction. A step portion 13A is formed on the outside of the plate portion 13, and an inclined surface 13B that rises from the upper end of the step portion 13A outward and upward at an angle of about 30 degrees from the horizontal is formed. On the other hand, a joining portion 15A having a predetermined thickness is formed at the bottom of the groove portion 72 which is the upper end (end cap 12B side) of the container body 12A. The joining portion 15A is a stepped portion 13A outside the back plate portion 13. To polymerize. And the inclined surface 15B which descends at an angle of about 30 degrees from the horizontal toward the outside downward from the lower end of the joining portion 15A is formed.

  That is, the joint portion 15A of the container body 12A and the back plate portion 13 of the end cap 12B overlap in the horizontal direction in the groove portion 72, and a low-permissible plane is formed at the bottom. The upper and lower inclined surfaces 13B and 15B constitute a groove portion 72, and both inclined surfaces 13B and 15B and the entire bottom surface from the bottom to the tip 72A are welded and fixed to the end cap 12B and the container body 12A. It becomes the welding surface to do.

  When the end cap 12B and the container main body 12A are fixed by welding, in the embodiment, the welding location is MIG welded by the welding torch 88. In this welding, the joint surface between the joint portion 15A and the back plate portion 13 is used. The aluminum core material 75 is piled up and welded in the groove portion 72 while being melted and bonded to each other, and this is performed twice (two-layer welding). In this case, the joining portion 15A has a thickness that allows the heat of welding to be sufficiently transmitted to the back plate portion 13, and the back plate portion 13 has a thickness that does not melt by the heat at the time of welding.

  Thus, since the groove portion 72 is formed around the entire circumference of the welded portion between the container main body 12A and the end cap 12B, so-called groove welding is performed, the container main body 12A and the end cap 12B are made of aluminum having high thermal conductivity. Even when configured, the welding area of the aluminum core member 75 can be expanded on the entire inner surface of the groove portion 72 to ensure sufficient welding strength.

  In particular, the groove dimension of the groove part 72 composed of the container body 12A and the end cap 12B is 50% or more and 200% or less of the thickness dimension of the minimum thickness part of the container body 12A and the end cap 12B. Actually, since it is set to 2 mm or more and 10 mm or less, the container body 12A or the end cap 12B constituting the upper and lower portions of the groove portion 72 is melted by heat at the time of welding, or the disadvantage that the durability is lowered is effectively avoided. Will be able to. That is, in the embodiment, since the container main body 12A constituting the groove portion 72 and the end cap 12B are formed with thick portions (L2, L3) of 5 mm or more, the container main body constituting the groove portion 72 by heat during welding. It can prevent effectively that 12A or end cap 12B melt | dissolves or durability falls. As a result, the weight of the sealed container 12 can be reduced and the assembly workability can be improved, and the strength can be secured without any trouble.

  Next, FIG. 4 shows an enlarged view of a welded portion between the container main body 12A and the end cap 12B constituting the rotary compressor 10 of another embodiment of the present invention. In addition, the container main body 12A and the end cap 12B of the embodiment have substantially the same configuration as the above-described embodiment. Hereinafter, different parts will be described. Also, the same parts as those of the above-described embodiments are denoted by the same reference numerals, and description thereof is omitted.

  In this case, the thickness of the thick portion (hereinafter referred to as the welded portion 15) of the container main body 12A constituting the groove portion 72 of the container main body 12A and the end cap 12B is t1, and the end cap at the groove portion 72 is the end cap. The thickness of the joint 15A of the container body 12A that is polymerized on the outside of 12B is t2, the thickness of the back plate 13 of the end cap 12B that is polymerized on the inside of the joint 15A of the container body 12A is t3, When the minimum wall thickness of 12A is t (FIG. 1), the wall thickness t1 of the welded portion 15 is 120% to 150% of the wall thickness t of the container body 12A, and the wall thickness of the joint 15A. t2 is configured to be 10% or more and 30% or less of the thickness t1 of the welded portion 15, and the thickness t3 of the back plate portion 13 is set to be twice the thickness t2 of the joined portion 15A.

  In the embodiment, t = 4.5, t1 = 6.1, t2 = 1, t3 = 2 (unit is mm). Then, two-layer welding is performed with the welding torch 88 as described above. Here, if the joining portion 15 </ b> A is too thick, heat during welding is hardly transmitted to the back plate portion 13. Further, if the back plate portion 13 is too thick, the melting by heat deteriorates. However, if the back plate portion 13 is too thin, the penetration penetrates and the spatter enters the sealed container 12. Further, if the wall thickness around the groove portion 72 is too thin, it will be melted by the heat during welding as described above, or the strength may be reduced. In addition to the effect of pre-welding, the joint 15A of the container body 12A to be polymerized and the back plate part 13 of the end cap 12B are melted together, while spattering them into the sealed container 12 through them. In addition, the strength of the container body 12A and the end cap 12B itself in the vicinity thereof is not reduced by the influence of heat during welding. As a result, the airtight container 12 can be reduced in weight and improved in assembling workability, while ensuring strength and preventing spatter contamination.

  Next, FIG. 5 shows an enlarged view of a welded portion between the container main body 12A and the end cap 12B constituting the rotary compressor 10 of another embodiment of the present invention. In addition, the container main body 12A and the end cap 12B of the embodiment have substantially the same configuration as the above-described embodiment. Hereinafter, different parts will be described. The same parts as those in the above-described embodiments are denoted by the same reference numerals, and the description thereof is omitted. In this case, a groove 13 </ b> C is provided over the entire circumference on the outer surface (the surface on the bonding portion 15 </ b> A side) of the back plate portion 13 of the end cap 12 </ b> B corresponding to the bonding portion 15 </ b> A of the container body 12 </ b> A.

  The groove 13 </ b> C is formed by recessing the outer surface of the back plate portion 13 (the surface on the joint portion 15 </ b> A side) by a predetermined dimension, and is continuously formed over the entire periphery of the back plate portion 13. The groove 13C is sized to cover substantially the entire joining portion 15A. That is, the groove 13C is provided in the back plate portion 13 of the end cap 12B that is superimposed on the inside of the container main body 12A at the groove portion 72, and the groove 13C is provided on the entire surface of the back plate portion 13 on the container main body 12A side. Form across. As a result, even when the joining portion 15A serving as the bottom portion of the groove portion 72 is melted and the container main body 12A and the end cap 12B are welded and fixed, the spatter can be accommodated in the groove 13C, and the spatter can enter the sealed container 12. The inconvenience of entering can be prevented.

  And, when the airtight container 12 made of aluminum as in this embodiment is mounted in the engine room of a vehicle for a car air conditioner that air-conditions the inside of the vehicle, an increase in the vehicle weight can be remarkably suppressed, and fuel consumption can be improved. Can be planned.

  In this embodiment, the airtight container 12 for compressors is made of aluminum. However, the present invention is not limited to this, and the airtight container is made of a metal material containing aluminum, or is not limited to aluminum, but is light weight that is difficult to weld. The present invention is effective even when the sealed container 12 is made of metal.

  Moreover, although the Example demonstrated the airtight container 12 which provided the end cap 12B to the rotary compressor 10 at the upper end, the rotary compressor 10 is not restricted to this, The opening formed in the upper and lower ends of a container main body, or both right and left ends is an end cap. The present invention is also effective for an airtight container that is closed by the above.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal side view of an internal intermediate pressure multi-stage compression rotary compressor of an embodiment of a compressor using a compressor airtight container of the present invention (Example 1). FIG. 2 is a plan view of the rotary compressor of FIG. 1. It is an enlarged view of the welding location of a rotary compressor. It is an enlarged view of the welding location of the airtight container for compressors of the other Example of this invention (Example 2). It is an enlarged view of the welding location of the rotary compressor of another another Example of this invention (Example 3).

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Rotary compressor 12 Sealed container 12A Container main body 12B End cap 13 Back plate part 13A Step part 13C Groove 14 Drive element (drive element)
DESCRIPTION OF SYMBOLS 15 Welding part 15A Joint part 18 Rotary compression mechanism part 72 Groove part 75 Aluminum core material

Claims (7)

In an airtight container for a compressor formed by closing an opening of a container body with an end cap and welding and fixing the entire circumference of the end cap to the container body,
The container body and the end cap are fixed by groove welding, and the groove dimension of the groove portion constituted by the container body and the end cap is set to be the minimum thickness portion of the container body and the end cap. An airtight container for a compressor, characterized by having a thickness of 50% or more and 200% or less. In an airtight container for a compressor formed by closing an opening of a container body with an end cap and welding and fixing the entire circumference of the end cap to the container body,
The container main body and the end cap are fixed by groove welding, and the groove dimension of the groove portion constituted by the container main body and the end cap is 2 mm or more and 10 mm or less. container. In an airtight container for a compressor formed by closing an opening of a container body with an end cap and welding and fixing the entire circumference of the end cap to the container body,
An airtight container for a compressor, wherein the container main body and the end cap are fixed by groove welding, and a thick wall portion of 5 mm or more is formed on the container main body and the end cap constituting the groove portion. In an airtight container for a compressor formed by closing an opening of a container body with an end cap and welding and fixing the entire circumference of the end cap to the container body,
While fixing the container body and the end cap by groove welding,
The thickness of the welded portion of the container body that constitutes the groove portion is t1, the thickness of the joint portion of the container body that overlaps the outside of the end cap at the groove portion is t2, and the joint portion of the container body When the thickness of the back plate portion of the end cap that is polymerized inside is t3, and the minimum thickness of the container body is t,
A sealed container for a compressor, wherein t1 is 120% to 150% of t, t2 is 10% to 30% of t1, and t3 is twice t2. In an airtight container for a compressor formed by closing an opening of a container body with an end cap and welding and fixing the entire circumference of the end cap to the container body,
The container body and the end cap are fixed by groove welding, and on the container body side surface of the back plate portion of the end cap that is polymerized inside the container body at the groove portion, over the entire circumference. An airtight container for a compressor, characterized in that a groove is formed.   The sealed container for a compressor according to claim 1, 2, 3, 4, or 5, wherein the container body and the end cap are composed of parts mainly made of aluminum.   A drive element and a compression element driven by the drive element are provided in the sealed container, the compression element sucks and compresses carbon dioxide refrigerant, and discharges the compressed gas into the sealed container; The second compression element configured to suck and compress the carbon dioxide refrigerant in the hermetic container, and further comprises a second compression element. A compressor using the airtight container for 6 compressors.

Images