JP2009047063A - Hermetic electric compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve reliability of a hermetic electric compressor by suppressing damage of a sleeve and dropping of the stator in the hermetic electric compressor having a compression mechanism part composed of a plurality of compression elements. <P>SOLUTION: A rotary compressor 1 of the hermetic electric compressor stores an electric element 3 and a rotary compression mechanism part 6 (pressure compression mechanism part) driven by the electric element 3 in a closed container 2, and composes the rotary compression mechanism part 6 of first and second rotary compression elements 4, 5. The rotary compressor 1 is equipped with a plurality of sleeves 70, 71, 72, 73 where refrigeration introduction pipes 82, 84 which are welded and fixed to the closed container 2, and introduce respective refrigerants to the respective rotary compression elements 4, 5 of the rotary compression mechanism part 6, and a refrigeration discharge pipe 86 for discharging respective refrigerants from the second rotary compression element 5 are connected. The stator 10 of the electric element 3 is shrink-fit in the inner side of the closed container 2, and this stator 10 is fixed to the closed container 2 by welding. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a hermetic electric compressor in which an electric element and a compression mechanism that is driven by the electric element and includes a plurality of compression elements are housed in a hermetic container.

Conventionally, in a hermetic electric compressor, for example, a rotary compressor, an electric element and a compression mechanism driven by the electric element are accommodated in a hermetic container. The sealed container includes a cylindrical body constituting the main body, an end cap provided with a terminal for closing one end opening of the cylindrical body and supplying power to the electric element, and the other opening of the cylindrical body is closed. It consists of a bottom constituting the bottom. As is well known, the electric element is composed of a stator and a rotor that rotates inside the stator. When the electric element is energized through the terminal and the wiring, the refrigerant is sucked into the cylinder of the compression mechanism, and the refrigerant is compressed by the operation of the roller and the vane to become a high-temperature and high-pressure refrigerant, Discharged. Thereafter, the high-temperature and high-pressure refrigerant discharged into the sealed container was discharged to the outside of the rotary compressor from a refrigerant pipe connected to the sealed container (for example, see Patent Document 1).
Japanese Patent No. 3843917

  By the way, in the hermetic electric compressor in which the compression mechanism portion is composed of a plurality of compression elements, the compression element disposed on the electric element side of the hermetic container is located near the center of the cylinder of the hermetic container, and the refrigerant is contained in the compression element. A sleeve for connecting a refrigerant pipe such as a refrigerant introduction pipe for introducing the refrigerant or a refrigerant pipe such as a refrigerant discharge pipe for discharging the refrigerant from the compression element approaches the center of the hermetic container.

  This sleeve is fixed to the sealed container by welding. Since the sealed container swells when the internal pressure becomes high, particularly the central part of the sealed container swells most. Damage is likely to occur at the fixing portion of the corresponding sleeve.

  Further, in the conventional hermetic electric compressor, the stator of the electric element is fixed to the inner peripheral surface of the cylindrical body of the hermetic container by shrink fitting, but the stator is deformed (expanded) as described above. There is also a problem that the stator is loosened and the stator is displaced or dropped.

  Accordingly, the present invention has been made to solve the conventional technical problem, and in a hermetic electric compressor in which a compression mechanism portion is constituted by a plurality of compression elements, damage to a sleeve and dropping of a stator are achieved. The purpose is to improve the reliability of the hermetic electric compressor.

  The hermetic electric compressor of the present invention includes an electric element and a compression mechanism unit driven by the electric element in a hermetic container, and the compression mechanism unit is composed of a plurality of compression elements. In addition, a refrigerant introduction pipe for introducing a refrigerant into each compression element of the compression mechanism and / or a refrigerant discharge pipe for discharging the refrigerant from each compression element is connected to the sealed container by welding. The stator of the electric element is held by shrink fitting inside the sealed container, and the stator is fixed to the sealed container by welding.

  According to a second aspect of the present invention, in the above-described invention, the hermetic container includes a cylindrical body constituting the main body and an end cap attached to the cylindrical body, and the stator is in the axial direction of the cylindrical body. It is fixed to the central part by welding.

  According to a third aspect of the present invention, there is provided a hermetic electric compressor according to the first aspect of the present invention, wherein the hermetic container includes a cylindrical body constituting a main body and an end cap attached to the cylindrical body, It is characterized by being fixed by welding at a position on the opposite side of the compression mechanism part from the central part in the axial direction of the body.

  A hermetic electric compressor according to a fourth aspect of the invention is characterized in that, in the invention according to any one of the first to third aspects, carbon dioxide is used as a refrigerant compressed by each compression element.

  According to the present invention, a hermetic electric compressor in which an electric element and a compression mechanism driven by the electric element are accommodated in a hermetic container, and the compression mechanism is constituted by a plurality of compression elements. , A refrigerant introduction pipe for introducing a refrigerant into each compression element of the compression mechanism and / or a refrigerant discharge pipe for discharging the refrigerant from each compression element is connected to the airtight container. The stator of the electric element having a plurality of sleeves is held by shrink fitting inside the sealed container, and since this stator is fixed to the sealed container by welding, the swelling of the sealed container can be suppressed. . Thereby, the damage which generate | occur | produces in a sleeve, and the shift | offset | difference and fall of a stator can be prevented or suppressed effectively.

  According to a second aspect of the present invention, the sealed container includes a cylindrical body constituting the main body and an end cap attached to the cylindrical body, and the stator is fixed to the central portion in the axial direction of the cylindrical body by welding. If it is made, it can suppress the swelling of an airtight container most effectively. Thereby, especially the damage of the sleeve with respect to the compression element of the position close | similar to the center of the airtight container among a plurality of compression elements can be prevented or suppressed.

  Further, in the first aspect of the invention, the sealed container as in the third aspect of the invention includes a cylindrical body constituting the main body and an end cap attached to the cylindrical body, and the stator is in the axial direction of the cylindrical body. If it is fixed by welding at a position opposite to the compression mechanism part from the center part, it will be fixed by welding at a position opposite to the sleeve with respect to the center of the cylinder. Therefore, it is possible to suppress the adverse effect of welding on the welded portion of the sleeve.

  In particular, in the invention described in each of the inventions described above, it becomes effective when carbon dioxide that becomes a remarkably high pressure by compression is used as the refrigerant compressed by each compression element as in the invention of claim 4. Thereby, it becomes possible to improve the reliability of the hermetic electric compressor using the carbon dioxide refrigerant.

  The present invention relates to a hermetic electric compressor having a compression mechanism portion composed of a plurality of compression elements, and damage to a sleeve to which a refrigerant introduction pipe and a refrigerant discharge pipe are connected due to deformation of the hermetic container, and shrink fitting to the hermetic container. This is made in order to suppress as much as possible the inconvenience that the stator held by the holder is displaced or dropped. The purpose of suppressing such damage to the sleeve and the deviation or dropping of the stator is realized by holding the stator by shrink fitting inside the sealed container and fixing it to the sealed container by welding. Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a longitudinal side view of a hermetic electric compressor according to an embodiment of the present invention. The hermetic electric compressor according to this embodiment includes a motor-driven element 3 as a driving element in a hermetic container 2 and a plurality of rotary compression elements (compression elements) driven by the motor-operated element 3. This is a rotary compressor 1 that houses a mechanism section 6 (compression mechanism section). In the rotary compressor 1 of the present embodiment, the rotary compression mechanism unit 6 includes a first rotary compression element 4 and a second rotary compression element 5, and compresses low-pressure refrigerant from the outside with the first rotary compression element 4. This is an internal intermediate pressure type multi-stage (two-stage) compression type rotary compressor which is discharged into the hermetic container 2 and then sucked into the second rotary compression element 5 and compressed. Specifically, the rotary compressor 1 of the present embodiment shown in FIG. 1 is provided with an electric element 3 in a vertical cylindrical airtight container 2 made of a steel plate above the inner space of the airtight container 2. A rotary compression mechanism 6 (first and second rotary compression elements 4 and 5) driven by the rotary shaft 7 of the electric element 3 is disposed below the element 3. In the rotary compressor 1 of this embodiment, carbon dioxide (CO ₂ ) is used as a refrigerant.

  The sealed container 2 includes a cylindrical body 2A that forms a main body and a substantially bowl-shaped end cap that closes an opening at one end (upper end) on the side where the electric element 3 of the cylindrical body 2A is disposed. (Lid body) 2B and a substantially bowl-shaped bottom (bottom body) 2C that closes the opening at the other end (lower end) of the cylindrical body 2A. A circular mounting hole 2D is formed on the upper surface of the end cap 2B, and a terminal (wiring is omitted) 8 for supplying power to the electric element 3 is mounted in the mounting hole 2D. Further, the bottom 2C of the present embodiment is located at the bottom of the sealed container 2 and is used as an oil reservoir. That is, the oil is stored in the bottom 2C, and the oil is pumped up by an oil pump 9 as an oil supply means, and can be supplied to each sliding portion or the like through an oil hole (not shown) in the rotary shaft 7. Has been.

  On the other hand, the electric element 3 includes a stator 10 that is annularly fixed along the inner peripheral surface of the space (upper space) on one end side of the cylindrical body 2A of the sealed container 2, and a slight gap between the stator 10 and the inner side. The rotor 11 is provided and inserted and installed, and the rotor 11 is fixed to a rotating shaft 7 extending in the vertical direction through the center.

  The stator 10 is composed of a laminate 12 in which a plurality of later-described electromagnetic steel plates (stator iron plates 15 described later) are laminated, and is directly wound (concentrated) around a tooth portion 16 (not shown in FIG. 1) of the laminate 12. The stator coil 13 is wound by a winding method. The rotor 11 is also composed of a laminated body 14 of electromagnetic steel sheets, like the stator 10.

  On the other hand, the rotary compression mechanism section 6 uses the intermediate partition plate 19 to sandwich the second rotary compression element 5 in the second stage on the electric element 3 side in the sealed container 2 and the first rotation in the first stage. The compression element 4 is arranged on the side opposite to the electric element 3. That is, in the rotary compressor 1 of the present embodiment, the first rotary compression element 4 is disposed on the lower side and the second rotary compression element 5 is disposed on the upper side with the intermediate partition plate 19 interposed therebetween. The first and second rotary compression elements 4, 5 are fitted into the cylinders 20, 22 and eccentric parts 24, 26 formed on the rotary shaft 7 of the electric element 3. The rollers 28 and 30 that rotate eccentrically, the vanes (not shown) that are in contact with the rollers 28 and 30 to divide the cylinders 20 and 22 into the low-pressure chamber side and the high-pressure chamber side, respectively, , A spring (not shown) as a spring member for biasing to the 30 side, and one (lower side) opening of the cylinder 22 constituting the first rotary compression element 4 are closed, and the rotation shaft 7 The lower support member 34 having the secondary bearing 34A and the upper support member 32 having the main bearing 32A of the rotary shaft 7 are closed while closing one (upper side) opening of the cylinder 20 constituting the second rotary compression element 5. Is done.

  Therefore, in the rotary compressor 1 of the present embodiment, the rotation shaft 7 is supported by the main bearing 32A at the substantially central portion in the axial direction of the rotation shaft 7 and supported by the sub-bearing 34A. The eccentric parts 24 and 26 are provided on the rotary shaft 7 with a phase difference of 180 degrees.

  The upper support member 32 and the lower support member 34 have suction passages 40 and 42 communicating with the inside of the cylinders 20 and 22 through suction ports 36 and 38, respectively, and the upper support member 32 opposite to the cylinder 20 (upper side). ) And the discharge silencer chamber 50 formed by closing the recessed portion with the upper cover 44 and the surface opposite to the cylinder 22 (lower side) of the lower support member 34 are recessed. A discharge silencing chamber 52 formed by closing the recessed portion with the lower cover 46 is provided. That is, the discharge silencing chamber 50 is closed by the upper cover 44, and the discharge silencing chamber 52 is closed by the lower cover 46.

The upper cover 44 is made of a substantially donut-shaped circular steel plate in which a hole through which the main bearing 32A of the upper support member 32 passes is formed, and the peripheral portion is fixed to the upper support member 32 from above by four bolts 60. Has been. The front end of the bolt 60 is screwed into the lower support member 34.
Similarly, the lower cover 46 is also made of a donut-shaped circular steel plate, and is fixed to the lower support member 34 from below with bolts 65 at the periphery, and the first rotary compression element is provided at a discharge port (not shown). The lower surface opening of the discharge silencing chamber 52 communicating with the inside of the fourth cylinder 22 is closed. The tip of the bolt 60 is screwed into the upper support member 32.

  The discharge silencer chamber 52 of the first rotary compression element 4 and the inside of the sealed container 2 are communicated with each other through a communication path. This communication path is a hole (not shown) that passes through the upper support member 32, the cylinders 20, 22, and the intermediate partition plate 19, and one end of the hole opens at the upper surface of the discharge silencer chamber 52. While communicating, the other end penetrates the upper support member 32 and communicates with the inside of the sealed container 2. With this configuration, the intermediate-pressure refrigerant compressed by the first rotary compression element 4 and discharged into the discharge silencer chamber 52 is discharged into the sealed container 2 through the communication path.

  And in the rotary compressor 1 of a present Example, the said carbon dioxide which is a natural refrigerant | coolant friendly to a global environment shall be used as a refrigerant | coolant. In addition, as the lubricating oil, existing oils such as mineral oil (mineral oil), PAG (polyalkylene glycol), alkylbenzene oil, ether oil and ester oil are used.

  Further, the side surfaces of the cylindrical body 2A of the sealed container 2 correspond to the suction passages 40 and 42 of the upper support member 32 and the lower support member 34, the discharge silencer chamber 50, and the upper side of the upper cover 44 (the lower end of the electric element 3). The sleeves 70, 71, 72 and 73 are fixed by welding at the positions. The sleeve 70 and the sleeve 71 are adjacent to each other in the vertical direction, and the sleeve 72 is substantially diagonal to the sleeve 70. Further, the sleeve 73 is at a position shifted from the sleeve 70 by approximately 90 degrees.

  In the sleeve 70, one end of a refrigerant introduction pipe 82 for introducing refrigerant gas into the cylinder 20 of the second rotary compression element 5 of the rotary compression mechanism section 6 is inserted and connected. One end of the refrigerant introduction pipe 82 is It communicates with the suction passage 40 of the cylinder 20. The refrigerant introduction pipe 82 passes through the upper side of the sealed container 2 and reaches the sleeve 73, and the other end is inserted and connected into the sleeve 73 to communicate with the sealed container 2.

  Further, one end of a refrigerant introduction pipe 84 for introducing refrigerant gas into the cylinder 22 of the first rotary compression element 4 of the rotary compression mechanism section 6 is inserted and connected in the sleeve 71, and one end of the refrigerant introduction pipe 84 is connected to the sleeve 71. It communicates with the suction passage 42 of the cylinder 22. Further, a refrigerant discharge pipe 86 for discharging refrigerant from the second rotary compression element 5 is inserted and connected in the sleeve 72, and one end of the refrigerant discharge pipe 86 communicates with the discharge silencer chamber 50.

  Here, the stator 10 of the electric element 4 described above will be described in detail with reference to FIGS. 2 and 3. 2 is a longitudinal plan view of the stator 10 and the hermetic container 2 of the rotary compressor 1 of the present embodiment shown in FIG. 1, and FIG. 3 is a view showing a part of the AA cross section of the stator 10 shown in FIG. The stator 10 is composed of a plurality of stator iron plates 15 made of electromagnetic steel plates such as silicon steel plates. Specifically, six tooth portions 16 are formed on the inner periphery of the stator iron plate 15, and six slots 17 that are open inwardly and vertically are formed between the tooth portions 16. Then, a plurality of stator iron plates 15 are stacked, and the stator 10 is configured by caulking and fixing caulking portions 18 provided at four locations on each of the stator iron plates 15.

  Next, the operation of the rotary compressor 1 of the present embodiment having the above configuration will be described. When the stator coil 13 of the electric element 3 is energized through the terminal 8 and a wiring (not shown), the electric element 3 is activated and the rotor 11 rotates. By this rotation, the rollers 28 and 30 fitted to the eccentric portions 24 and 26 provided integrally with the rotary shaft 7 rotate eccentrically in the cylinders 20 and 22.

  As a result, the low-pressure refrigerant gas sucked from the suction port 38 to the low-pressure chamber side of the cylinder 22 through the refrigerant introduction pipe 84 and the suction passage 42 formed in the lower support member 34 is supplied to the roller 30 and a vane (not shown). It is compressed by the operation to become an intermediate pressure, and is discharged from the high pressure chamber side of the cylinder 22 into the discharge silencer chamber 52 through a discharge port (not shown). The intermediate-pressure refrigerant gas discharged into the discharge silencer chamber 52 is discharged into the sealed container 2 through a communication path (not shown). Thereby, the inside of the airtight container 2 becomes an intermediate pressure.

  Then, the intermediate-pressure refrigerant gas in the sealed container 2 passes through the refrigerant introduction pipe 82 and is sucked from the suction port 36 to the low pressure chamber side of the cylinder 20 through the suction passage 40 formed in the upper support member 32. The The intermediate-pressure refrigerant gas sucked into the low-pressure chamber side of the cylinder 20 from the suction port 36 is compressed in the second stage by the operation of the roller 28 and a vane (not shown) to become a high-temperature and high-pressure refrigerant gas. From the chamber side, it passes through a discharge port (not shown) and is discharged into a discharge silencer chamber 50 formed in the upper support member 32. The high-temperature and high-pressure refrigerant gas discharged into the discharge silencer chamber 50 is discharged to the outside of the rotary compressor 1 through a refrigerant discharge pipe 86 communicated with the discharge silencer chamber 50.

  By the way, in the hermetic electric compressor in which the rotary compression mechanism portion as in this embodiment is composed of a plurality of compression elements (two compression elements of the first rotary compression element 4 and the second rotary compression element 5 in this embodiment). The compression element (the second rotary compression element 5 in the present embodiment) located on the electric element 3 side of the sealed container 2 is positioned near the center of the cylindrical body 2A of the sealed container 2. Accordingly, a sleeve 70 for connecting the refrigerant introduction pipe 82 for introducing the refrigerant to the second rotary compression element 5 and a sleeve for connecting the refrigerant discharge pipe 86 for discharging the refrigerant from the second rotary compression element 5 are used. 72 approaches the center of the sealed container 2.

  In this case, as described above, the intermediate pressure refrigerant gas compressed by the first rotary compression element 4 is discharged into the sealed container 2 of the rotary compressor 1, and the pressure of the gas discharged into the sealed container 2. Therefore, there is a possibility that the closed container 2 is deformed (expanded) so as to expand. In particular, when an abnormality such as a fan lock occurs, the pressure of the refrigerant abnormally rises, causing a problem that the pressure in the sealed container 2 rises above the design pressure of the sealed container 2. Thus, if the pressure in the sealed container 2 continues to rise abnormally, the sealed container 2 cannot withstand the pressure and deforms greatly (expands), and the sealed container 2 is welded to the sealed container 2 due to the deformation of the sealed container 2. There was a risk of adversely affecting the fixed sleeve. In particular, since the central portion of the sealed container 2 swells most, as described above, damage to the fixing portion of the sleeve corresponding to the second rotary compression element 5 at a position close to the center is likely to occur. In particular, when a carbon dioxide refrigerant is used as in the rotary compressor 1 of the present embodiment, the carbon dioxide refrigerant has an extremely high pressure due to compression compared to other refrigerants, so that the problem of deformation of the sealed container 2 due to such pressure is further increased. It was serious.

  Further, since the electric element housed in the sealed container of the rotary compressor has been conventionally fixed to the inner peripheral surface of the cylinder of the sealed container by shrink fitting, the stator 10 can be fixed by deformation of the sealed container 2. There has also been a problem that the stator 10 has been loosened and dropped.

  Therefore, in the rotary compressor 1 of the present invention, the stator 10 of the electric element 3 is held inside the sealed container 2 by shrink fitting, and the stator 10 is fixed to the sealed container 2 by welding. In the present embodiment, the stator 10 is fixed to the central portion in the axial direction of the cylindrical body 2A constituting the main body of the sealed container 2 by welding. In this case, the rotary compressor 1 according to the present embodiment is arranged such that the lower end portion of the stator 10 is positioned at the center portion in the axial direction of the cylindrical body 2A as shown in FIG. It will be fixed to the cylinder 2A of the sealed container 2 by welding.

  Here, a method for assembling the rotary compressor 1 will be described. First, the sleeves 70 to 73 are sequentially inserted into circular holes (not shown) for attaching the sleeves 70 to 73 formed in advance to the cylinder 2A, and the sleeves 70 to 73 are welded to the cylinder 2A (projection welding). Secure with.

  At this time, since the cylindrical body 2A is deformed by heat at the time of welding of the sleeves 70 to 73, an instrument is inserted into the inner surface of the cylindrical body 2A to widen the inner surface of the cylindrical body 2A. The cylindrical body 2A is molded again so as to have an inner diameter, and then the bottom 2C is inserted into the opening at the other end (lower end) of the cylindrical body 2A, and the cylindrical body 2A and the bottom 2C are fixed by welding.

  Next, the electric element 3 and the rotary compression mechanism portion 6 are attached to the rotary shaft 7 of the electric element 3 and the electric element 3 and the rotary compression mechanism portion 6 which are integrally molded in advance are inserted into the sealed container 2, and the electric element 3 The stator 10 is fixed inside the sealed container 2 by shrink fitting. Specifically, the cylinder 2A is turned upside down, that is, with the bottom 2C on the upper side, the cylinder 2A is heated and expanded, and the electric element 3 and the rotary compression mechanism section assembled in advance are assembled. 6 is inserted into the opening on the side opposite to the bottom 2C of the cylindrical body 2A (the side to which the end cap 2A is attached later) from the rotary compression mechanism portion 6 side, and is disposed at a predetermined position positioned in the cylindrical body 2A. To do. In this state, when the heated cylinder 2A is cooled and the cylinder 2A is contracted, the outer peripheral surface of the stator 10 of the electric element 3 is fixed (shrink-fitted) to the inner peripheral surface of the cylinder 2A. Thereby, the starter 10 is hold | maintained by shrink fitting in the airtight container 2 inner side (inner peripheral surface of 2 C of cylinders).

  Thereafter, a hole 90 is formed by a drill from the outer peripheral surface side to the inner peripheral surface side of the cylindrical body 2A in the central portion in the axial direction of the cylindrical body 2A (that is, the position corresponding to the lower end of the stator 10 in this embodiment). Then, the stator 10 and the cylindrical body 2A are fixed from the hole 90 by welding. That is, by welding from each hole 90, the molten high-temperature welding material, the stator iron plate 15 near the hole 90, and the cylindrical body 2A near the hole 90 are melted and integrated. Thereby, the stator 10 and the cylinder 2A are joined. In this embodiment, as shown in FIG. 2, three holes 90 are formed at a position corresponding to the lower end of the stator 10 of the cylindrical body 2 </ b> A with an interval of approximately 120 degrees, and the holes 90 are welded to form the stator 10. And the cylinder 2A are joined.

  Further, in the present embodiment, among the stator iron plates 15 constituting the stator 10 as shown in FIG. 4, the other stator iron plate 15B of the stator iron plate 15A arranged closest to the rotational compression mechanism section 6 side (lower side). A hole 90 is formed so that a surface (bottom surface) on the side of the rotary compression mechanism portion 6 that is not laminated is aligned with one end (lower end) of the welding portion 92 on the side of the rotary compression mechanism portion 6, and welding is performed. Shall be performed. 1, 2, and 4, the welded portion 92 is shown in a shape along the hole 90, but the actual welded portion includes the stator iron plate 15 of the stator 10 and a part of the cylindrical body 2 </ b> A. They melt together and become a whole, and the whole becomes a weld.

  Further, in the present embodiment, the bottom surface of the stator iron plate 15A and one end (lower end) of the welded portion 92 are positioned as described above. However, the present invention is not limited to this. For example, as shown in FIG. The hole 90 may be formed at a position where one end (lower end) of the portion 92 is above the bottom surface of the stator iron plate 15A. That is, when the hole 90 is formed at a position where one end (lower end) of the welded portion 92 is closer to the rotary compression mechanism portion 6 side than the bottom surface of the stator iron plate 15A, the welding material flows into the lower side of the stator iron plate 15A during welding. There arises an inconvenience of dripping into the sealed container 2.

  Therefore, in the present invention, at least one end (lower end) of the welded portion 92 on the rotary compression mechanism portion 6 side is the stator iron plate 15A for the stator on the most rotational compression mechanism portion 6 side (lower side) constituting the stator 10. The surface (bottom surface) on the side of the rotary compression mechanism portion 6 that is the side where 15B is not laminated, or the side on which another stator iron plate 15B is laminated from the surface (the side opposite to the rotary compression mechanism portion 6, that is, In the present embodiment, if the hole 90 is formed on the upper side and welded, the position is not limited to the position shown in FIG. 4 or 5 and is effective.

  On the other hand, after fixing the lower end of the stator 10 to the sealed container 2 (cylinder 2A) as described above, the terminal 8 is attached in advance to the opening opposite to the bottom 2C of the cylinder 2A. The end cap 2B is welded. Thereby, the airtight container 2 is comprised. And nitrogen gas is enclosed in the said airtight container 2, and each refrigerant | coolant piping (Refrigerant introduction pipe 82, Refrigerant introduction pipe 84, and refrigerant discharge pipe 86) mentioned above is welded in each sleeve 70-73 in the state. In this way, with the end cap 2B as described above attached to the cylinder 2A and completing the sealed container 2, nitrogen is replaced in the sealed container 2 and each refrigerant pipe is welded in each sleeve 70-73. By doing so, it is possible to prevent the disadvantage that each refrigerant pipe is oxidized by welding.

  As described above in detail, according to the rotary compressor 1 of the present invention, the stator 10 is held inside the sealed container 2 by shrink fitting, and the stator 10 is fixed to the sealed container 2 by welding. Therefore, it is possible to eliminate the deviation or dropping of the stator 10 in advance. Moreover, the welding fixation can prevent the deformation of the sealed container 2 as much as possible. That is, even if the pressure in the sealed container 2 rises abnormally, if the fixed state by welding between the stator 10 and the sealed container 2 (cylindrical body 2A) is maintained, the deformation (swelling) of the sealed container 2 in the welded portion 8 occurs. ) Can be suppressed. Thereby, it is possible to effectively prevent or suppress the above-described damage of the sleeve, in particular, the damage generated in the sleeves 70 and 72 with respect to the second rotary compression element 5 located near the center of the sealed container 2. become.

  In particular, the bulging of the sealed container 2 can be most effectively suppressed by welding and fixing the stator 10 at the central portion in the axial direction of the cylindrical body 2A of the sealed container 2 in which the sealed container 2 is most easily swelled. Become.

  In addition, when the rotary compressor 1 is accidentally dropped with the rotary compression mechanism 6 side down during conveyance or the like by welding and fixing the lower end of the stator 10 to the sealed container 2 as in this embodiment. However, it is possible to reliably avoid the inconvenience that the stator iron plate 15 falls. Therefore, the pressure resistance of the sealed container 2 and the reliability of the rotary compressor 1 can be improved by the present invention.

  In particular, the present invention is effective in the rotary compressor 1 that uses a carbon dioxide refrigerant that has an extremely high pressure by compression compared to other refrigerants. Thereby, the reliability of the rotary compressor 1 using a carbon dioxide refrigerant can be improved.

  In the first embodiment, in the sealed container 2, the stator 10 is disposed so that the lower end is located at the center in the axial direction of the cylinder 2A, and the lower end of the stator 10 is the cylinder of the sealed container 2. Although fixed to 2A by welding, the present invention is not limited to this. For example, as shown in FIG. 6, the present invention is effective even when the stator 10 is fixed to the cylindrical body 2 </ b> A of the sealed container 2 by welding. FIG. 6 is a longitudinal side view of the hermetic electric compressor of the present embodiment. The hermetic electric compressor according to this embodiment is an internal intermediate pressure multi-stage (two-stage) compression rotary compressor 1 as in the first embodiment. Accordingly, in the present embodiment, only the configuration different from the rotary compressor 1 of the first embodiment will be described. In FIG. 6, the same reference numerals as those in FIGS. 1 to 5 denote the same or similar effects or actions.

  In the rotary compressor 1 of this embodiment, the stator 10 is fixed by welding at a position on the opposite side of the rotary compression mechanism 6 from the central part in the axial direction of the cylindrical body 2A (that is, on the upper side of the rotary compressor 1). It is. In this case, a hole 95 is formed by a drill from the outer peripheral surface side to the inner peripheral surface side of the cylindrical body 2A closer to the rotary compression mechanism portion side than the central portion in the axial direction of the cylindrical body 2A. And the cylinder 2A are fixed by welding. In this embodiment, three holes 95 are formed in the cylindrical body 2A at a position corresponding to the substantially central portion of the stator 10 in the axial direction of the cylindrical body 2A with an interval of about 120 degrees, and the stator 10 And the cylinder 2A are fixed by welding. That is, by welding from the hole 95, the molten high-temperature welding material, the stator iron plate 15 near the hole 95, and the cylindrical body 2A near the hole 95 are melted and integrated. Thereby, the stator 10 and the cylinder 2A are joined. Further, the welding of the stator 10 and the sealed container 2 is performed in the same method and order as the welding of the lower end portion of the stator 10 and the sealed container 2 described in the first embodiment. The welded portion 96 shown in FIG. 6 is shown in a shape along the hole 95, but the actual welded portion is integrated with the stator iron plate 15 of the stator 10 and a part of the cylindrical body 2A. All of these become welds.

  Also in the case of the embodiment described in detail above, the stator 10 is held by shrink fitting inside the sealed container 2 and the stator 10 is fixed to the sealed container 2 by welding. In addition, it is possible to prevent deformation of the hermetic container 2 as much as possible while eliminating the fall.

  In particular, in the present embodiment, the stator 10 is fixed by welding at a position on the opposite side of the rotary compression mechanism 6 from the central portion in the axial direction of the cylindrical body 2A (that is, above the rotary compressor 1). 10 is fixed by welding at a position on the opposite side of the sleeve 70 and the sleeve 72 with respect to the center of the cylindrical body 2A. The sleeves 70 and 72 of the second rotary compression element 5 that are welded and fixed to the cylindrical body 2A closer to the rotary compression mechanism 6 than the center in the axial direction can be sufficiently separated from the welded portion of the stator 10. Thereby, when the stator 10 is welded and fixed to the cylindrical body 2 </ b> A, it is possible to suppress the adverse effect of welding on the welded portions of the sleeves 70 and 72.

  Next, a hermetic electric compressor according to another embodiment of the present invention will be described with reference to FIG. The hermetic electric compressor according to this embodiment is an internal intermediate pressure multi-stage (two-stage) compression rotary compressor 1 as in the first embodiment. Accordingly, in the present embodiment, only the configuration different from the rotary compressor 1 of the first embodiment will be described. In FIG. 7, the same reference numerals as those in FIGS. 1 to 6 are used, and the description thereof is omitted because they have the same or similar effects or actions.

  In the rotary compressor 1 of this embodiment, in addition to the welding of the lower end portion of the stator 10 of the first embodiment, the upper end portion of the stator 10 is also fixed to the sealed container 2 by welding. In this embodiment, as shown in FIG. 8, among the stator iron plates 15 constituting the stator 10, the other stator iron plate 15C for the stator iron plate 15C disposed on the side opposite to the rotational compression mechanism 6 (upper side). Holes so that the surface (upper surface) opposite to the rotary compression mechanism portion 6 on the side where 15B is not laminated coincide with one end (upper end) of the welded portion 93 opposite to the rotary compression mechanism portion 6. 91 is formed and welding is performed.

  In this case, a hole 91 is formed by a drill from the outer peripheral surface side to the inner peripheral surface side of the cylindrical body 2A in the cylindrical body 2A at a position corresponding to the upper end of the stator 10, and the stator 10 and the cylindrical body 2A are formed from the hole 91. And are fixed by welding. In the present embodiment, three holes 91 are formed at a position corresponding to the upper end of the stator 10 of the cylindrical body 2A with an interval of approximately 120 degrees, and the stator 10 and the cylindrical body 2A are welded from the holes 91 by welding. Fix it. That is, by welding from the hole 91, the molten high-temperature welding material, the stator iron plate 15 near the hole 91, and the cylindrical body 2A near the hole 91 are melted and integrated. Thereby, the stator 10 and the cylinder 2A are joined. Further, the welding of the upper end portion of the stator 10 and the sealed container 2 is performed at the same time as the welding of the lower end portion of the stator 10 and the sealed container 2 described in the first embodiment, or immediately before or immediately after that. Assumed to be performed. 7 and 8, the welded portion 92 and the welded portion 93 are shown in a shape along the holes 90 and 91, but the actual welded portion is part of the stator iron plate 15 of the stator 10 and the cylindrical body 2A. And melt together to form a weld.

  Further, in the present embodiment, the upper surface of the stator iron plate 15C and one end (upper end) of the welded portion 93 are positioned as described above. However, the present invention is not limited to this, for example, as shown in FIG. The hole 91 may be formed at a position where one end (upper end) of the portion 93 is below the upper surface of the stator iron plate 15C. That is, when the hole 91 is formed at a position where one end (upper end) of the welded portion 93 is on the opposite side of the upper surface of the stator iron plate 15C from the rotary compression mechanism portion 6, the welding material is welded from above the stator iron plate 15C. The inconvenience of flowing into the sealed container 2 occurs.

  Accordingly, in the present invention, at least one end (upper end) of the welded portion 93 opposite to the rotary compression mechanism portion 6 of the stator iron plate 15C on the opposite side (upper side) of the most opposite rotary compression mechanism portion 6 constituting the stator 10 is provided. The surface (upper surface) opposite to the rotary compression mechanism portion 6 on the side where the other stator iron plates 15B are not stacked, or the side on which the other stator iron plates 15B are stacked (rotational compression mechanism portion). If the hole 91 is formed on the 6th side, that is, the lower side in this embodiment and welded, the position is not limited to the position shown in FIG. 8 or 9 and is effective.

  As described in detail above, according to the rotary compressor 1 of the present embodiment, the deformation of the sealed container 2 can be prevented as much as possible while eliminating the deviation and dropping of the stator in the same manner as in the above embodiments. Become.

  Further, as in the first embodiment, the expansion of the sealed container 2 is most effectively suppressed by welding and fixing the stator 10 at the central portion in the axial direction of the cylindrical body 2A of the sealed container 2 in which the sealed container 2 is most easily expanded. Will be able to. Further, by fixing the lower end portion of the stator 10 to the sealed container 2 by welding, the stator iron plate can be used even when the rotary compressor 1 is accidentally dropped with the rotary compression mechanism portion 6 side down during transportation or the like. The inconvenience that 15 falls can be avoided reliably.

  In particular, according to the rotary compressor 1 of the present embodiment, in addition to the welding of the lower end portion of the stator 10 of the first embodiment, the upper end portion of the stator 10 is welded and fixed to the hermetic container 2, thereby rotating and compressing. Even when the rotary compressor 1 is dropped with the side opposite to the mechanism portion 6 down, the inconvenience of the lower stator iron plate 15 falling in this state can be eliminated.

  As a result, in the rotary compressor 1 having the electric element 3 having the stator 10 formed by laminating a plurality of stator iron plates 15 and fixing them by crimping, the stator iron plate 15 is inconvenienced such as dropping or shifting. Can be prevented. That is, even if the rotary compressor 1 is accidentally dropped, the inconvenience that the stator iron plate 15 constituting the stator 10 is displaced or dropped can be prevented, so that the reliability of the rotary compressor 1 can be improved. It becomes possible to plan.

  In each of the above embodiments, the present invention is applied to the internal intermediate pressure type multi-stage (two-stage) compression rotary compressor 1, but can also be applied to the internal high-pressure type multi-stage compression rotary compressor 100. FIG. 10 is a longitudinal side view of the rotary compressor 100 showing an example of this case. 10 that have the same reference numerals as those in FIGS. 1 to 9 have the same or similar effects or actions, and therefore the description thereof is omitted here.

  In the rotary compressor 100 of the present embodiment, the low-pressure refrigerant from the outside is compressed by the first rotary compression element 4, and then the intermediate-pressure refrigerant compressed by the first rotary compression element 4 is used as the second rotary compression element. 5 is an internal high-pressure multi-stage (two-stage) compression type rotary compressor that sucks into 5 and compresses and discharges it into the sealed container 2.

  That is, in the rotary compressor 100 of the present embodiment, the discharge silencer chamber 50 of the second rotary compression element 5 and the inside of the sealed container 2 are communicated with each other through a communication path. This communication path is a hole (not shown) that passes through the upper cover 44, and one end of this hole opens at the upper surface of the discharge silencer chamber 50, communicates with the inside of the discharge silencer chamber 50, and the other end of the upper cover 44. It penetrates the upper surface and opens into the sealed container 2 so as to communicate with the sealed container 2. With this configuration, the high-temperature and high-pressure refrigerant compressed by the second rotary compression element 5 and discharged into the discharge silencer chamber 50 is discharged into the sealed container 2 through the communication path.

  Further, on the side surface of the cylindrical body 2A of the sealed container 2, the suction passages 40, 42 of the upper support member 32 and the lower support member 34, the discharge silencer chamber 52, and the rotary compression mechanism portion 6 of the electric element 3 are opposite to each other (that is, In this embodiment, sleeves 70, 71, 75, 76 are welded and fixed at positions corresponding to the upper side of the electric element 3). The sleeve 70 and the sleeve 71 are adjacent to each other in the vertical direction, and the sleeve 75 is on the diagonal line of the sleeve 71.

  In the sleeve 70, one end of a refrigerant introduction pipe 82 for introducing refrigerant gas into the cylinder 20 is inserted and connected in the same manner as in the above embodiments, and one end of the refrigerant introduction pipe 82 is connected to the suction passage 40 of the cylinder 20. Communicate. The refrigerant introduction pipe 82 passes through the upper side of the sealed container 2 and reaches the sleeve 75, and the other end is inserted and connected into the sleeve 75 to communicate with the discharge silencer chamber 52.

  Also, in the sleeve 71, one end of a refrigerant introduction pipe 84 for introducing refrigerant gas into the cylinder 22 is inserted and connected in the same manner as in the above embodiments, and one end of the refrigerant introduction pipe 84 is connected to the suction passage 42 of the cylinder 22. Communicate. Further, a refrigerant discharge pipe 86 is inserted and connected into the sleeve 76, and one end of the refrigerant discharge pipe 86 communicates with the inside of the sealed container 2.

  And the rotary compressor 100 of a present Example shall also use the carbon dioxide which is a natural refrigerant | coolant friendly to a global environment as a refrigerant | coolant similarly to the said each Example. Similarly, the existing oil such as mineral oil (mineral oil), PAG (polyalkylene glycol), alkylbenzene oil, ether oil, ester oil is used as the lubricating oil.

  Next, the operation of the rotary compressor 100 of the present embodiment having the above configuration will be described. When the stator coil 13 of the electric element 3 is energized through the terminal 8 and a wiring (not shown), the electric element 3 is activated and the rotor 11 rotates. By this rotation, the rollers 28 and 30 fitted to the eccentric portions 24 and 26 provided integrally with the rotary shaft 7 rotate eccentrically in the cylinders 20 and 22.

  As a result, the low-pressure refrigerant gas sucked from the suction port 38 to the low-pressure chamber side of the cylinder 22 through the refrigerant introduction pipe 84 and the suction passage 42 formed in the lower support member 34 is supplied to the roller 30 and a vane (not shown). It is compressed by the operation to become an intermediate pressure, and is discharged from the high pressure chamber side of the cylinder 22 into the discharge silencer chamber 52 through a discharge port (not shown).

  The intermediate-pressure refrigerant gas discharged into the discharge muffler chamber 52 passes through the refrigerant introduction pipe 82 communicated with the discharge muffler chamber 52 and passes through the suction passage 40 formed in the upper support member 32 to be a suction port. 36 is sucked into the low pressure chamber side of the cylinder 20. The intermediate-pressure refrigerant gas sucked into the low-pressure chamber side of the cylinder 20 from the suction port 36 is compressed in the second stage by the operation of the roller 28 and a vane (not shown) to become a high-temperature and high-pressure refrigerant gas. From the chamber side, it passes through a discharge port (not shown) and is discharged into a discharge silencer chamber 50 formed in the upper support member 32.

  The high-temperature and high-pressure refrigerant gas discharged into the discharge muffler chamber 50 is discharged from there through a communication path (not shown) into the sealed container 2. Thereby, the inside of the airtight container 2 becomes a high pressure. The high-temperature and high-pressure refrigerant gas discharged into the hermetic container 2 moves to the space above the hermetic container 2 through the gap of the electric element 3, and the rotary compressor 100 passes through the refrigerant discharge pipe 86 connected thereto. It is discharged outside.

  As described above, the high-pressure refrigerant gas compressed by the second rotary compression element 5 is discharged into the sealed container 2 of the rotary compressor 100. In this case, in the rotary compressor 100 of the present embodiment, the high-temperature and high-pressure carbon dioxide refrigerant compressed by the second rotary compression element 5 is discharged into the sealed container 2, so that the intermediate-pressure carbon dioxide as in each of the embodiments described above. The pressure in the sealed container 2 is much higher than when the refrigerant is discharged into the sealed container 2, and the problem of the deformation of the sealed container 2 due to the pressure described above is more serious.

  Therefore, in the rotary compressor 100 of the present embodiment, the stator 10 is held by shrink fitting inside the sealed container 2 and the lower end portion of the stator 10 is closed to the sealed container, similarly to the rotary compressor 1 of the first embodiment. 2 is fixed by welding. Further, the rotary compressor 100 of the present embodiment is similarly configured so that the lower end portion of the stator 10 corresponds to the central portion in the axial direction of the cylindrical body 2A, and therefore the lower end portion of the stator 10 is welded to the sealed container 2. Thus, the stator 10 is fixed to the central portion of the cylindrical body 2A by welding.

  The assembly method of the rotary compressor 100, the formation position of the hole 90, and the like are the same as those described in detail in the first embodiment, and thus the description thereof is omitted here.

  Thus, since the stator 10 is held by shrink fitting inside the sealed container 2 and the stator 10 is fixed to the sealed container 2 by welding, the deviation and dropping of the stator can be eliminated in advance. Can do. In addition, such welding and fixing can suppress the deformation of the sealed container 2 as much as possible. That is, even if the pressure in the sealed container 2 rises abnormally, if the fixed state by welding between the stator 10 and the sealed container 2 (cylindrical body 2A) is maintained, the deformation (swelling) of the sealed container 2 in the welded portion 8 occurs. ) Can be suppressed. As a result, it is possible to effectively prevent or suppress the above-described damage to the sleeve, in particular, damage to the sleeve 70 with respect to the second rotary compression element 5 located near the center of the sealed container 2. .

  In particular, the bulging of the sealed container 2 can be most effectively suppressed by welding and fixing the stator 10 at the central portion in the axial direction of the cylindrical body 2A of the sealed container 2 in which the sealed container 2 is most easily swelled. Become.

  In addition, when the rotary compressor 1 is accidentally dropped with the rotary compression mechanism 6 side down during conveyance or the like by welding and fixing the lower end of the stator 10 to the sealed container 2 as in this embodiment. However, it is possible to reliably avoid the inconvenience that the stator iron plate 15 falls. Therefore, the pressure resistance of the sealed container 2 and the reliability of the rotary compressor 1 can be improved by the present invention.

  In particular, the present invention is particularly effective in the rotary compressor 100 in which the inside of the sealed container 2 is at a high temperature and a high pressure as in the present embodiment, while using a carbon dioxide refrigerant that has an extremely high pressure by compression compared to other refrigerants. . As a result, the expansion (deformation) of the sealed container 2 of the internal high-pressure rotary compressor 100 in which the high-temperature and high-pressure carbon dioxide refrigerant is discharged into the sealed container 2 can be suppressed and fixed to the sealed container 2 by welding. Therefore, it is possible to prevent damage to the sleeves 70, 7175, 76, displacement and dropping of the stator 10 as much as possible, so that the reliability of the rotary compressor 100 can be improved.

  Further, the configuration described in detail in the second embodiment, that is, as shown in FIG. 11, the stator 10 is on the opposite side of the rotary compression mechanism 6 from the central portion in the axial direction of the cylindrical body 2A (upper side of the rotary compressor 1). The present invention is effective even if the structure fixed by welding at the position is applied to the internal high-pressure multistage compression rotary compressor 100. FIG. 11 is a longitudinal side view of the rotary compressor 100 in this case. In FIG. 11, the same reference numerals as those in FIGS. 1 to 10 denote the same or similar effects or actions. It shall play. Further, since the operation of the rotary compressor 100 in this embodiment is the same as that of the rotary compressor 100 of the fourth embodiment, the description thereof is omitted.

  Thus, since the stator 10 is fixed by welding at a position on the opposite side of the central portion in the axial direction of the cylindrical body 2A from the rotary compression mechanism 6 (that is, the upper side of the rotary compressor 1), the stator 10 is cylindrical. Since it is fixed by welding at a position opposite to the sleeve 70 with respect to the center of the body 2A, it is the position closest to the center of the sealed container 2 and from the center in the axial direction of the cylinder 2A. In addition, the sleeve 70 of the second rotary compression element 5 welded and fixed to the cylindrical body 2A on the rotary compression mechanism portion 6 side can be sufficiently separated from the welded portion of the stator 10. Thereby, when the stator 10 is welded and fixed to the cylindrical body 2 </ b> A, it is possible to suppress the adverse effect of welding on the welded portion of the sleeve 70.

  Next, the hermetic electric compressor shown in FIG. 12 is another embodiment of the present invention, and the hermetic electric compressor according to this embodiment is an internal high pressure type as in the fourth and fifth embodiments. This is a multi-stage (two-stage) rotary compressor 100. Therefore, in the present embodiment, only the configuration different from the rotary compressor 100 of the fourth and fifth embodiments will be described. In FIG. 12, components having the same reference numerals as those in FIGS. 1 to 11 are omitted because they have the same or similar effects or actions.

  In the rotary compressor 100 of the fourth embodiment, as in the compressor 1 of the first embodiment, the stator 10 is held by shrink fitting inside the sealed container 2, and the lower end portion of the stator 10 is welded to the sealed container 2. However, in the rotary compressor 100 of the present embodiment, in addition to the welding of the lower end portion of the stator 10 as in the rotary compressor 1 shown in the third embodiment, the upper end portion of the stator 10 is also sealed in the sealed container 2. It shall be fixed by welding. In this case, the formation position and the like of the hole 91 are the same as those described in detail in the third embodiment, and a description thereof will be omitted here.

  Thus, according to the rotary compressor 100 of the present embodiment, the configuration of the rotary compressor 100 of the fourth embodiment (that is, the stator 10 is held by shrink fitting inside the sealed container 2 and the lower end of the stator 10 is Is fixed to the sealed container 2 by welding), and the upper end of the stator 10 is also fixed to the sealed container 2 by welding. Therefore, even if the rotary compressor 100 is accidentally dropped, the stator Since the inconvenience that the stator iron plate 15 constituting 10 is displaced or dropped can be prevented, the reliability of the rotary compressor 1 can be improved.

  In each of the above embodiments, the vertical multi-stage compression type rotor compressor has been described as an example, but the hermetic electric compressor of the present invention is not limited to the rotary compressor of each embodiment, and at least It is effective if it is a hermetic electric compressor in which a plurality of compression mechanisms are configured by a plurality of compression elements. For example, it is effective for a single stage having a plurality of compression elements, for example, a two-cylinder rotary compressor, a rotary compressor having three or more stages of compression elements, and is not limited to a rotary compressor. Even a compressor of the form cannot be used. Further, the present invention can also be applied to a horizontal hermetic electric compressor.

It is a vertical side view of the hermetic electric compressor of one example of the present invention. Example 1 FIG. 2 is a transverse plan view of a stator and a sealed container of an electric element of the hermetic electric compressor of FIG. 1. It is AA sectional drawing of the stator of FIG. It is an enlarged view of the welding part of the stator and sealed container of the hermetic electric compressor of FIG. It is an enlarged view of the welding part of the stator and airtight container of the other example of the airtight electric compressor of FIG. It is a vertical side view of the hermetic electric compressor according to another embodiment of the present invention. (Example 2) It is a vertical side view of the hermetic electric compressor according to another embodiment of the present invention. (Example 3) It is an enlarged view of the upper end part of the stator of the hermetic electric compressor of FIG. It is an enlarged view of the upper end part of the stator of another example of the hermetic electric compressor of FIG. It is a vertical side view of the hermetic electric compressor of the 4th example of the present invention. (Example 4) It is a vertical side view of the hermetic electric compressor of the 5th example of the present invention. (Example 5) It is a vertical side view of the hermetic electric compressor of the sixth embodiment of the present invention. (Example 6)

Explanation of symbols

1 Rotary compressor (sealed electric compressor)
DESCRIPTION OF SYMBOLS 2 Sealed container 2A Cylindrical body 2B End cap 2C Bottom 3 Electric element 4 1st rotation compression element 5 2nd rotation compression element 6 Rotation compression mechanism part 7 Rotating shaft 8 Terminal 9 Oil pump 10 Stator 11 Rotor 12, 14 Laminated body 13 Stator Coil 15 Stator Iron Plate (Electromagnetic Steel Sheet)
16 tooth portion 17 slot 18 caulking portion 19 intermediate partition plate 20, 22 cylinder 24, 26 eccentric portion 28, 30 roller 32 upper support member 32A main bearing 34 lower support member 34A sub bearing 36, 38 suction port 40, 42 suction passage 44 Upper cover 46 Lower cover 50, 52 Discharge silencer chamber 60, 65 Bolts 70, 71, 72, 73 Sleeve 82, 84 Refrigerant introduction pipe 86 Refrigerant discharge pipe 90, 91, 95 hole 92, 93, 96 Welded part

Claims (4)

In a hermetic electric compressor that houses an electric element and a compression mechanism unit driven by the electric element in a hermetic container, and the compression mechanism part is constituted by a plurality of compression elements.
A refrigerant introduction pipe for introducing a refrigerant into each compression element of the compression mechanism and / or a refrigerant discharge pipe for discharging the refrigerant from each compression element is connected to the sealed container by welding. With multiple sleeves,
The stator of the electric element is held by shrink fitting inside the sealed container, and the stator is fixed to the sealed container by welding. The sealed container includes a cylindrical body constituting a main body, and an end cap attached to the cylindrical body,
The hermetic electric compressor according to claim 1, wherein the stator is fixed to a central portion in the axial direction of the cylindrical body by welding. The sealed container includes a cylindrical body constituting a main body, and an end cap attached to the cylindrical body,
2. The hermetic electric compressor according to claim 1, wherein the stator is fixed by welding at a position opposite to the compression mechanism portion with respect to a central portion in the axial direction of the cylindrical body.   The hermetic electric compressor according to any one of claims 1 to 3, wherein carbon dioxide is used as a refrigerant compressed by each compression element.

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