JP2009144602A - Rotary compressor and manufacturing method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotary compressor capable of reducing a size as a whole, and improving productivity. <P>SOLUTION: A rotary compression mechanism 18 includes an upper cylinder 38, an upper support member 54 that closes an opening face of the upper cylinder and has a bearing 54A for a rotating shaft 16 of an electric element, and an upper cover 66 which closes a discharge muffling chamber 46 of the upper support member 54, and to which the upper support member and the upper cylinder are fixed. The upper cover has a penetrating part 66C which is formed at the central portion and through which the bearing of the upper support member is inserted by clearance-fitting, and a fixed part 66B which is formed at the peripheral portion so as to extend on the side of the upper support member and secured by being welded to a sealed container in such a state that the fixed part is arranged in the sealed container by clearance-fitting. A clearance between the penetrating part of the upper cover and the bearing of the upper support member is set to be smaller than a clearance between the fixed part of the upper cover and the sealed container. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a rotary compressor in which a driving element and a rotary compression mechanism portion driven by the driving element are housed in an airtight container, and a manufacturing method thereof.

  2. Description of the Related Art Conventionally, a hot water supply device and an in-vehicle air conditioner have a refrigerant circuit composed of a heat exchanger and a compressor (see, for example, Patent Document 1). This compressor is composed of a rotary compressor in which a drive element (electric element) and a rotary compression mechanism portion driven by this drive element are housed in an airtight container. By rotating and driving, the introduced refrigerant is compressed and discharged.

In this case, in the above-mentioned patent document, the upper support member and the cylinder are fixed to the cover for closing the discharge silencing chamber formed in the bearing of the upper support member constituting the rotary compression mechanism, and the cover is fixed to the sealed container by welding. Was.
Japanese Patent Laying-Open No. 2005-220752

  However, in the configuration of the above-mentioned patent document, a contact portion bent toward the drive element side is formed on the peripheral portion of the cover, and this contact portion is welded to the inner surface of the sealed container, so that the drive element and the contact portion interfere with each other. In order to avoid this, the distance between the cover and the driving element has to be taken into account, which causes a problem that the overall height of the rotary compressor is enlarged.

  In addition, the bearing of the upper support member is configured to penetrate the center of the cover, but the structure between the cover and the bearing is sealed by an O-ring, and the cover is involved in positioning the upper support member and the cylinder. It was not a thing.

  The present invention has been made to solve the conventional technical problems, and an object of the present invention is to provide a rotary compressor capable of reducing the overall dimensions and improving productivity and a method for manufacturing the same. To do.

  A rotary compressor according to a first aspect of the present invention is a housing in which a drive element and a rotary compression mechanism portion driven by the drive element are housed in an airtight container. The rotary compression mechanism portion includes a cylinder and the cylinder. A support member having a bearing for the rotating shaft of the drive element, a discharge silencer chamber formed in a recess in the support member, and closing the discharge silencer chamber, and fixing the support member and the cylinder The cover is formed in the center portion and the support member's bearing is penetrated by a clearance fit, and the cover is formed in the peripheral portion and extends to the support member side. A fixing portion welded and fixed to the sealed container in a state of being provided by fitting, and a gap between the cover penetration portion and the bearing of the support member is smaller than a clearance between the cover fixing portion and the sealed container. Specially To.

  According to a second aspect of the present invention, there is provided a manufacturing method according to a second aspect of the present invention, in which a rotary compressor is produced by housing a drive element and a rotary compression mechanism section driven by the drive element in an airtight container; A support member that closes the opening surface of the cylinder and has a bearing for the rotation shaft of the drive element, a discharge silencer chamber that is recessed in the support member, and a cover that closes the discharge silencer chamber are prepared. The cover is formed with a penetrating portion at the center and a fixing portion extending toward the supporting member at the peripheral portion, and a gap between the penetrating portion of the cover and the bearing of the supporting member is formed between the fixing portion of the cover and the sealed container. In addition to setting the bearing portion of the cover to be smaller than the gap between them, the bearing of the support member is passed through the penetration portion of the cover with a gap fit, and the fixing portion of the cover is fixed with the support member and the cylinder fixed to the cover. Dense Provided by a clearance fit in a container inside, in that state, wherein the welding fixing the fixing portion to the sealed container.

  According to the present invention, since the fixing portion of the cover that is welded and fixed to the hermetic container is extended to the support member side, the driving element and the fixing portion of the cover do not interfere with each other compared to the conventional case, It is possible to reduce the overall size of the rotary compressor by reducing the distance between the drive element and the cover.

  In particular, since the gap between the cover penetration and the bearing of the support member is set to be smaller than the gap between the cover fixing part and the sealed container, the support member bearing is fitted into the cover penetration. It is possible to increase the coaxiality of the rotary compression mechanism by the inner diameter of the penetrating part and the outer diameter of the bearing, so that the assembling workability is remarkably improved and the productivity can be improved. It will be.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal sectional view of a rotary compressor 10 that is an internal high-pressure multistage (two-stage) compression compressor provided with a first rotary compression element 32 and a second rotary compression element 34 according to an embodiment of the present invention. .

The rotary compressor 10 according to the embodiment is an internal high-pressure multistage compression rotary compressor that is mounted in an engine room of a vehicle such as an electric vehicle (HEV or PEV) and uses carbon dioxide (CO ₂ ) as a refrigerant. The rotary compressor 10 is housed in a cylindrical sealed container 12, an electric element 14 that is a driving element housed above the inner space of the sealed container 12, and a lower side of the inner space of the sealed container 12, The rotary compression mechanism 18 is connected to the electric element 14.

  The electric element 14 is provided in a ring shape along the inner peripheral surface of the upper space of the sealed container 12, and is provided inside the stator 22 so as to be rotatable through a slight gap (air gap). And a rotor 24.

  The stator 22 includes a laminated body 26 in which donut-shaped electromagnetic steel plates are laminated, and a stator coil 28 wound around the teeth of the laminated body 26 by a direct winding (concentrated winding) method. In addition, the rotor 24 includes a rotating shaft 16 that passes through the center of rotation, a laminated body 30 in which electromagnetic steel plates are laminated similarly to the stator 22, and a permanent magnet MG disposed in the laminated body 30.

  On the other hand, the rotary compression mechanism 18 is provided above the second rotary compression element 34 and the first rotary compression element 32 (first stage) and the second rotary compression element 34 (second stage) driven by the electric element 14. The upper support member 54 arranged and the upper cover 66 as a cover in the present invention, the intermediate partition plate 36 arranged between the first rotary compression element 32 and the second rotary compression element 34, and the first rotary compression element The lower support member 56 and the lower cover 68 which are disposed below the rotation shaft 32 and also serve as bearings for the rotary shaft 16 are provided. Here, the excluded volume of the second rotary compression element 34 is smaller than the excluded volume of the first rotary compression element 32.

  The second rotary compression element 34 includes an upper cylinder 38, an upper eccentric portion 42 disposed in the upper cylinder 38 and fixed to the rotary shaft 16, an upper roller 46 fitted to the upper eccentric portion 42, An upper vane (not shown) that abuts against the upper roller 46 and divides the inside of the upper cylinder 38 into a low pressure side and a high pressure side is provided.

  The upper cylinder 38 is connected to a suction port 161 that communicates the low pressure side and the suction passage 58 of the upper support member 54, and a discharge port (not shown) that communicates the high pressure side and a discharge silencer chamber 62 described later of the upper support member 54. ) And are formed.

  As the second rotary compression element 34 rotates, the refrigerant gas is sucked into the low pressure side through the suction port 161. Then, when the upper eccentric portion 42 and the upper roller 46 are eccentrically rotated, the space where the refrigerant gas in the upper cylinder 38 is sucked is reduced. As a result, the refrigerant gas is compressed to a high pressure, and is discharged from the high pressure side to the discharge silencer chamber 62 through the discharge port.

  The upper support member 54 includes a suction passage 58 connected to the suction port 161 of the upper cylinder 38, and a discharge silencing chamber 62 formed to be recessed from the upper surface and connected to the discharge port of the upper cylinder 38. . The upper support member 54 is provided with a discharge valve (not shown) that opens and closes the discharge port.

  A bearing 54A of the rotating shaft 16 is formed upright at the center of the upper support member 54, and a cylindrical bush 122 is mounted on the inner surface of the bearing 54A. The bush 122 is made of a material having good sliding properties.

  The upper cover 66 closes the discharge silencing chamber 62 of the upper support member 54. Thereby, the discharge silencing chamber 62 and the electric element 14 side in the sealed container 12 are partitioned. As shown in FIGS. 2 and 3, the upper cover 66 is formed by bending a partition portion 66A for partitioning the sealed container 12 and bending the outer peripheral edge of the partition portion 66A to the upper support member 54 side (lower side). The fixing portion 66B is provided on the inner surface of the hermetic container 12 with a gap fit, and the through portion 66C is formed at the center of the partition portion 66A. A flange 66D that is burred on the upper side is formed around the through portion 66C.

  Then, the bearing 54A of the upper support member 54 passes through the through portion 66C of the upper cover 66 with a clearance fit. Further, in the embodiment, the fixing portion 66B has a size of 9 mm or more in the vertical direction (axial direction of the sealed container 12), and is fixed to the sealed container 12 by tack welding, but between the penetrating portion 66C and the bearing 54A. The gap P1 is set smaller than the gap P2 between the fixed portion 66B and the inner surface of the closed container 12 (P1 <P2). Further, the upper cover 66 is formed with a communication port 66E that communicates the inside of the discharge silencer chamber 62 and the inside of the sealed container 12 on the electric element 14 side.

  On the other hand, the first rotary compression element 32 has the same configuration as the second rotary compression element 34, and the rotary shaft 16 has a phase difference of 180 degrees with respect to the upper eccentric portion 42 in the lower cylinder 40 and the lower cylinder 40. A lower eccentric portion 44 fixed to the lower eccentric portion 44, a lower roller 48 fitted to the lower eccentric portion 44, and a lower vane (not shown) that abuts against the lower roller 48 and partitions the lower cylinder 40 into a low pressure side and a high pressure side. And.

  The lower cylinder 40 has a suction port 162 that communicates the low pressure side and the suction passage 60 of the lower support member 56, and a discharge port (not shown) that communicates the high pressure side and a discharge silencer chamber 64, which will be described later, of the lower support member 56. Is formed.

  When the first rotary compression element 32 is driven to rotate, the refrigerant gas is sucked into the low pressure side through the suction port 162. The space where the refrigerant gas in the lower cylinder 40 is sucked is reduced by the eccentric rotation of the lower eccentric portion 44 and the lower roller 48. As a result, the refrigerant gas is compressed to a high pressure and is discharged from the high pressure side through the discharge port.

  The lower support member 56 includes a suction passage 60 connected to the suction port 162 of the lower cylinder 40, and a discharge silencing chamber 64 that is formed to be recessed in the lower surface and connected to the discharge port of the lower cylinder 40. The lower support member 56 is provided with a discharge valve (not shown) that opens and closes the discharge port. A bearing 56 </ b> A is formed through the center of the lower support member 56. The lower cover 68 closes the discharge silencing chamber 64 of the lower support member 56. The lower cover 68 is formed of a donut-shaped circular steel plate and is fixed to the lower support member 56.

  The upper and lower cylinders 38 and 40, the intermediate partition plate 36, the upper and lower part supporting members 54 and 56, and the upper and lower part covers 66 and 68 are fastened from above and below by four main bolts 128 and main bolts 129, respectively. That is, the main bolt 128 is inserted from the upper cover 66 side, and its tip is screwed to the upper cylinder 38 with two bolts. The remaining two main bolts 128 are screwed into the lower cylinder 40. The main bolt 129 is inserted from the lower cover 68 side, and its tip is screwed into the upper cylinder 38.

In consideration of flammability and toxicity, carbon dioxide (CO ₂ ), which is a natural refrigerant that is friendly to the global environment, is used as the refrigerant. As the oil (lubricating oil), existing oils such as mineral oil (mineral oil), alkylbenzene oil, ether oil, ester oil, or PAG (polyalkylene glycol) are used.

  The sealed container 12 is formed of a material mainly composed of aluminum, and is fixed by welding so as to close the cylindrical container body 12A that houses the electric element 14 and the rotary compression mechanism 18 and the bottom opening of the container body 12A. The bottom portion 12C, which is an oil reservoir, and a substantially bowl-shaped end cap (lid body) 12B fixed by welding so as to close the upper opening of the container body 12A. A circular mounting hole 12D is provided at the center of the end cap 12B. A terminal (wiring omitted) 20 having an electrical terminal 139 for supplying electric power to the electric element 14 is attached to the attachment hole 12D.

  On the outer surface of the container body 12A of the sealed container 12, a sleeve 142 into which the refrigerant introduction pipe 94 is inserted, a sleeve 141 into which one end of the refrigerant pipe 92 is inserted, and a sleeve 144 into which the other end of the refrigerant pipe 92 is inserted. A sleeve 143 through which the refrigerant discharge pipe 96 is inserted is provided. The sleeve 143 is provided on the opposite side (upper side) of the rotary compression mechanism portion 18 of the electric element 14.

  One end of the refrigerant introduction pipe 94 is connected to the suction passage 60 of the lower support member 56 through the sleeve 142, and the other end is connected to the lower end of an accumulator of a refrigerant circuit (not shown). One end of the refrigerant pipe 92 is connected to the suction passage 58 of the upper support member 54 through the sleeve 141, and the other end is connected to the discharge silencing chamber 64 of the lower support member 56 through the sleeve 144. The refrigerant discharge pipe 96 is connected to the sealed container 12 above the electric element 14 through the sleeve 143. The fixing portion 66B at a position corresponding to the sleeve 141 is notched (right side in FIG. 3).

  The above rotary compressor 10 is assembled in the following procedures. Note that the sealed container 12 and the upper cover 66 are formed of a material mainly composed of iron.

  First, the rotary compression mechanism unit 18 is assembled. In this case, the bearing 54A of the upper support member 54 is inserted into the through portion 66C of the upper cover 66, and is fitted with a clearance fit. In this state, the rotary shaft 16, the upper cylinder 48, the upper roller 46, the intermediate partition plate 36, the lower cylinder 40, and the lower roller 48 are stacked under the upper support member 54 (actually reversed and stacked). The four main bolts 128 are inserted from the upper cover 66 side, screwed into the upper cylinder 38 with the two main bolts 128, and screwed into the lower cylinder 40 with the remaining two main bolts 128.

  Next, the lower support member 56 and the lower cover 68 are sequentially stacked under the lower cylinder 40, the main bolt 129 is inserted from the lower cover 68 side, and penetrates them to be screwed into the upper cylinder 38. In this way, the rotary compression mechanism 18 is assembled. Since the bearing 54A of the upper support member 54 is passed through the penetration 66C of the upper cover 66 by a clearance fit, the inner diameter (flange) of the penetration 66C. 66D and the outer diameter of the bearing 54A, the rotational compression mechanism 18 can be coaxial. Thereby, the assembling workability of the rotary compression mechanism portion 18 is remarkably improved. The inner diameter of the through portion 66C may be cut after burring to increase accuracy. In this state, the fixing portion 66B is located outside the upper support member 54.

  Next, the rotary compression mechanism 18 assembled in this way is set on a jig in an upside down state. Further, the stator 22 of the electric element 14 is also set on the jig so as to be positioned around the rotary shaft 16 extending downward from the set rotary compression mechanism 18. In this state, the bottom body 12C welded to the container body 12A is turned upside down, and the rotary compression mechanism 18 and the stator 22 are covered from above.

  At this time, the stator 22 is shrink-fitted on the inner surface of the container body 12A. Further, the fixing portion 66B of the upper cover 66 is fitted into the gap inside the container body 12A. Next, they are reversed, the rotor 24 is inserted into the rotary shaft 16 from above with the rotary shaft 16 as the upper side, and fixed by shrink fitting. At this time, the rotor 24 is located inside the stator 22. And the air gap of both is adjusted using a clearance gauge.

  In this case, in the present invention, the gap P1 between the penetration part 66C of the upper cover 66 and the bearing 54A of the upper support member 54 is smaller than the gap P2 between the fixing part 66B of the upper cover 66 and the sealed container 12 (container body 12A). Therefore, the air gap can be adjusted without any trouble using the gap P2.

  After adjusting the air gap in this way, the fixing portion 66B is fixed to the container body 12A by tack welding. Finally, the end cap 12B is put on the container body 12A and fixed by welding, and the permanent magnet MG of the rotor 24 is magnetized using the stator coil 28 of the stator 22. Further, the refrigerant introduction pipe 94 is inserted into the sleeve 142, the refrigerant pipe 92 is inserted into the sleeves 141 and 144, and the refrigerant discharge pipe 96 is inserted into the sleeve 143 to complete.

  At this time, since the welding area is expanded by the fixing portion 66B of the upper cover 66, the fixing strength of the upper cover 66 to the sealed container 12 is improved. Further, in the present invention, since the fixing portion 66B extends to the upper support member 54 side, the stator coil 28 of the electric element 14 and the fixing portion 66B do not interfere with each other as compared with the conventional case, and the electric element 14 It is possible to reduce the distance between the upper cover 66 and the upper cover 66. Thereby, the whole dimension of the rotary compressor 10 can be reduced in size.

  Next, the operation of the rotary compressor 10 will be described. First, when the stator coil 28 of the electric element 14 is energized via the terminal 20 and a wiring (not shown), the electric element 14 is activated and the rotor 24 rotates. As a result, the upper and lower rollers 46 and 48 of the rotary compression elements 32 and 34 eccentrically rotate in the upper and lower cylinders 38 and 40 via the rotary shaft 16 and the upper and lower eccentric parts 42 and 44.

  As a result, the low-pressure (first-stage suction pressure LP: 4 MPaG) refrigerant gas in the refrigerant introduction pipe 94 is sucked into the rotary compressor 10. Specifically, the refrigerant gas is sucked into the low pressure side of the first rotary compression element 32 via the suction passage 60 of the lower support member 56 and the suction port 162 of the lower cylinder 40 of the first rotary compression element 32. . The sucked low-pressure refrigerant gas is compressed by the operation of the lower roller 48 and the lower vane of the first rotary compression element 32 to become a refrigerant gas having an intermediate pressure (first-stage discharge pressure MP1: 8 MPaG). This intermediate-pressure refrigerant gas is discharged from the high-pressure chamber side of the first rotary compression element 32 to the refrigerant pipe 92 through the discharge port of the lower cylinder 40 and the discharge silencer chamber 64 of the lower support member 56.

  The intermediate-pressure refrigerant gas passes through the refrigerant pipe 92, the suction passage 58 of the upper support member 54, and the suction port 161 of the upper cylinder 38 of the second rotary compression element 34 to the low pressure side of the second rotary compression element 34. Inhaled (second-stage suction pressure MP2: 8 MPaG). The sucked intermediate-pressure refrigerant gas is further compressed by the operation of the upper roller 46 and the upper vane of the second rotary compression element 34 to become high-temperature and high-pressure (second-stage discharge pressure HP: 12 MPaG) refrigerant gas. This high-pressure refrigerant gas passes from the high pressure chamber side of the second rotary compression element 34 through the discharge port of the upper cylinder 38 and the discharge silencer chamber 62 of the upper support member 54 to the lower side of the electric element 14 from the communication port 66E. It is discharged into the sealed container 12.

  The refrigerant gas discharged into the hermetic container 12 passes through an air gap between the stator 22 and the rotor 24, moves to the upper side of the electric element 12, and is discharged from the refrigerant discharge pipe 96 to the outside.

It is a vertical side view of the rotary compressor of the Example to which this invention is applied. It is a top view of the upper cover 66 of the rotary compressor of FIG. It is a vertical side view of the upper cover 66 of FIG.

Explanation of symbols

10 Rotary compressor 12 Airtight container 14 Electric element (drive element)
16 Rotating shaft 18 Rotating compression mechanism 32 First rotating compression element 34 Second rotating compression element 54 Upper support member (support member)
54A Bearing 62 Discharge silencer 66 Upper cover (cover)
66B fixed part 66C penetration part

Claims (2)

In a rotary compressor in which a driving element and a rotary compression mechanism driven by the driving element are housed in a sealed container,
The rotary compression mechanism includes a cylinder, a support member that closes an opening surface of the cylinder and has a bearing for the rotation shaft of the drive element, a discharge silencer chamber that is recessed in the support member, and the discharge silencer chamber And a cover to which the support member and the cylinder are fixed,
The cover is formed in a central portion, and a through portion through which the bearing of the support member is penetrated by a clearance fit, and is formed in a peripheral portion and extends to the support member side. A fixing portion that is welded and fixed to the sealed container in a state of being provided
A rotary compressor characterized in that a gap between the cover penetrating portion and the bearing of the support member is made smaller than a gap between the fixing portion of the cover and the sealed container. A method of manufacturing a rotary compressor by housing a driving element and a rotary compression mechanism driven by the driving element in an airtight container,
A cylinder constituting the rotary compression mechanism; a support member that closes an opening surface of the cylinder and has a bearing for the rotary shaft of the drive element; a discharge silencer chamber that is recessed in the support member; and the discharge silencer Prepare a cover to close the chamber,
The cover is formed with a penetrating portion at the center and a fixing portion extending toward the support member at the peripheral portion, and a gap between the cover penetrating portion and the bearing of the support member is formed by the cover fixing portion. And set to be smaller than the gap between the sealed containers,
The bearing of the support member is passed through the penetration portion of the cover with a gap fit, and the support member and the cylinder are fixed to the cover, and the fixing portion of the cover is provided with a gap fit inside the sealed container, In this state, the fixing part is welded and fixed to the sealed container.

Images