JP2008057394A - Rotary compressor and refrigerant cycle device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce sliding loss by making an eccentric part small and using a rolling bearing on a shaft having smaller diameter. <P>SOLUTION: The rotary compressor 100 is provided with an electric motor part 120 arranged at an upper part in a hermetic case 110, a compression mechanism part 130 arranged at a lower part of the electric motor part 120, and a shaft 140 connecting the electric motor part 120 and the compression mechanism part 130. The shaft 140 is fixed on the electric motor part 120, is concentric with a main shaft part 141 supported by a first bearing member 132, the eccentric part 142 arranged in the compression chamber provided at a tip of the main shaft part 141, and the main shaft part 141 provided on the eccentric part 142, is formed in a small diameter than diameter of the main shaft part 141, and is formed with an auxiliary shaft part 143 supported by a second bearing member 133. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a rotary compressor and a refrigeration cycle used for an air conditioner and the like, and more particularly to reduction of sliding loss.

  For example, a rotary compressor is used in a refrigeration cycle apparatus such as an air conditioner. In such a rotary compressor, various devices for reducing the size are made. For example, the eccentric part is reduced in size, the shaft having the eccentric part is supported by rolling bearings at a plurality of locations, and the other shaft is eccentric from the rotation axis in the axial direction of the cam with the eccentric part of the shaft interposed therebetween. Those are known (for example, see Patent Document 1).

In addition, the shaft portion is supported by two plain bearings provided on the motor part side of the cylinder and on the opposite side of the motor part side from the motor part side, thereby preventing generation of vibration and noise. There is also a rotary compressor formed so as to be miniaturized (see, for example, Patent Document 2).
JP-A-5-256283 JP 2001-323886 A

  The above rotary compressor has the following problems. That is, when the diameter of the eccentric portion of the shaft is increased, the sliding surface is increased, and the sliding loss is increased. However, in order to reduce the eccentric part, one of the shaft shaft diameters connected to the eccentric part must be reduced. However, if the shaft is decentered to reduce the shaft diameter, the number of parts and the number of bearings will increase. Further, when the shaft shaft diameter is reduced, the reliability of the slide bearing is lowered. Furthermore, if only a plain bearing is used for the shaft, the loss increases. For this reason, when the eccentric portion is made small, there are problems such as sliding loss, an increase in cost and manufacturing process, and an increase in size of the compressor.

  Accordingly, an object of the present invention is to provide a rotary compressor and a refrigeration cycle apparatus that can be downsized by reducing an eccentric portion and can reduce sliding loss in a shaft.

  In order to solve the problems and achieve the object, the rotary compressor and the refrigeration cycle apparatus of the present invention are configured as follows.

  A sealed case, a motor part provided in the sealed case, a cylinder forming a cylinder chamber, a main shaft coupled to the motor part and penetrating the cylinder chamber and pivotally supported by a first bearing member A rotary compressor including a shaft having a shaft portion, a countershaft portion supported by a second bearing member, and an eccentric portion located in the cylinder chamber, and a roller engaged with the eccentric portion of the shaft. One of the main shaft portion and the sub shaft portion of the shaft is formed to have a smaller diameter than the other, and the first or second bearing member that pivotally supports one shaft portion having the larger shaft diameter is formed by a slide bearing. A rolling bearing is provided on the first or second bearing member that pivotally supports the other shaft portion having a small shaft diameter.

  The rotary compressor, a condenser connected to the rotary compressor, an expansion device connected to the condenser, and an evaporator connected to the expansion device.

  According to the present invention, it is possible to reduce the size by reducing the eccentric portion and to reduce the sliding loss in the shaft.

  FIG. 1 is a cross-sectional view showing a configuration of a refrigeration cycle apparatus 1 according to a first embodiment of the present invention and a rotary compressor 100 incorporated in the refrigeration cycle 1, and FIG. 2 is a compression mechanism portion of the rotary compressor 100. FIG.

  As shown in FIG. 1, the refrigeration cycle apparatus 1 includes a rotary compressor 100, a condenser 200 connected to the discharge port 101 of the rotary compressor 100, an expansion device 300 connected to the condenser 200, and an expansion device. An evaporator 400 connected to 300 and an accumulator 500 connected to the evaporator 400 are sequentially connected.

  The rotary compressor 100 includes an electric motor unit 120 disposed in an upper portion of the sealed case 110, a compression mechanism unit 130 disposed in a lower part of the electric motor unit 120, and a shaft 140 that connects the electric motor unit 120 and the compression mechanism unit 130. And have. The sealing case 110 includes an upper lid 110 a for sealing the sealing case 110.

  The electric motor unit 120 includes a rotor 121 fixed to the shaft 140 and a stator 122 fixed to the hermetic case 110. The rotor 121 includes a permanent magnet, and the stator 122 includes, for example, a coil. It is formed by winding with a concentrated winding method. In addition, the motor unit 120 is connected to an inverter device, a commercial power source, or the like that varies the operating frequency.

  The compression mechanism unit 130 forms a compression chamber (cylinder chamber). For example, the cylinder 131 press-fitted into the sealed case 110 and fixed by welding, the first bearing member 132 provided on the upper end surface of the cylinder 131, and the first A second bearing member 133 provided on the lower end surface of the cylinder 131 facing the bearing member 132, an eccentric portion 142 provided on the shaft 140 and disposed in the compression chamber, and a roller 134 provided on the outer peripheral surface of the eccentric portion 142. And a vane 136 that is provided in the cylinder 131 and receives a back pressure on the back surface by, for example, a spring 135 and a high-pressure refrigerant in the sealed case 110 and contacts the outer peripheral surface of the roller 134.

  The shaft 140 is fixed to the motor unit 120 and is supported by the first bearing member 132, the eccentric part 142 provided at the tip of the main shaft part 141 and disposed in the compression chamber, and the eccentric part 142. The main shaft portion 141 is concentric with the main shaft portion 141 and has a diameter smaller than that of the main shaft portion 141 and is supported by the second bearing member 133. The shaft 140 passes through the cylinder 131, the first bearing member 132, and the second bearing member 133.

  The first bearing member 132 has a discharge hole 137 for discharging the refrigerant compressed in the compression chamber, and a valve cover 160 that covers the discharge hole 137 is provided. Moreover, the site | part which contacts the main-shaft part 141 of the shaft 140 of the 1st bearing member 132 becomes a slide bearing, and the shaft 140 is supported by this slide bearing. Further, a pressure groove 138 is provided on the surface of the first bearing member 132 on which the roller 134 slides so as not to generate a large surface pressure.

  The second bearing member 133 has a rolling bearing 161 that supports the countershaft portion 143 of the shaft 140, and the inner diameter of the second bearing member 133 is smaller than the outer ring outer shape of the rolling bearing 161 on the surface in contact with the compression chamber. And it has the through-hole 139 larger than an inner ring outer diameter. The valve cover 160, the first bearing member 132, the cylinder 131, and the second bearing member 133 are coupled by a bolt 162.

  In the refrigeration cycle apparatus 1 configured as described above, first, the rotor 121 rotates by supplying external energy (for example, commercial power supply) to the motor unit 120 of the rotary compressor 100, and the shaft fixed to the rotor 121. 140 rotates. At this time, the main shaft portion 141 of the shaft 140 rotates, the eccentric portion 142 rotates eccentrically, and the auxiliary shaft portion 143 rotates. The roller 134 provided in the eccentric portion 142 rotates eccentrically in the compression chamber in the cylinder 131 as with the eccentric portion 142. At this time, since the vane 136 is in contact with the roller 134, the compression chamber is divided into two, and the refrigerant from the accumulator 500 is compressed by the roller 134 rotating eccentrically.

  The compressed refrigerant passes from the discharge hole 137 through the valve cover 160 into the sealed case 110, and sequentially passes through the condenser 200, the expansion device 300, and the evaporator 400 from the discharge port 101 provided in the sealed case 110. Return to the rotary compressor 100 via the accumulator 500.

  As described above, according to the refrigeration cycle apparatus 1 according to the present embodiment, by making the diameter of the auxiliary shaft portion 143 of the shaft 140 provided in the rotary compressor 100 smaller than the diameter of the main shaft portion 141, eccentricity is achieved. The diameter of the part 142 can be reduced. This is because the diameter Dc of the eccentric portion 142 is expressed by D ≧ 2e + Ds from the relationship between the eccentricity e and the shaft shaft diameter Ds, so that the diameter of the eccentric portion 142 is reduced by reducing the diameter of the auxiliary shaft portion 143. This is because it holds.

  Thus, since the diameter of the roller 134 can be reduced by reducing the eccentric portion 142, the sliding area can be reduced and the sliding loss can be reduced. Further, even if the diameter of the shaft 140 (in this embodiment, the diameter of the auxiliary shaft portion 143) is reduced, the diameter of the shaft 140 can be reduced by using the rolling bearing 161 that is more reliable than the slide bearing for the auxiliary shaft portion 143. It is also possible to prevent a decrease in reliability due to conversion. Thereby, the rotary compressor 1 can be reduced in size and weight.

  Further, by providing the first bearing member 132 with the pressure groove 138, the axial direction (from the pressure groove 138 of the first bearing member 132 and the through groove 139 of the second bearing member 133 to the sliding surface of the roller 134 ( Pressure is applied in the direction toward the eccentric portion 142), and the difference in pressure applied to the sliding surface of the roller 134 can be reduced. For this reason, since the pressure which presses the roller 134 to either one of the axial directions is reduced, it is possible to reduce the sliding loss due to the pressing of the roller 134.

  Further, by providing the second bearing member 133 with a through hole 139 having an inner diameter smaller than the outer ring outer diameter of the rolling bearing 161 and larger than the outer diameter of the inner ring, the seal width between the sliding of the second bearing member 133 and the roller 134 is provided. Since (tight width) can be easily secured, the leakage of the refrigerant is reduced. Furthermore, when the through-hole 139 is provided, the diameter of the rolling bearing can be increased and the amount of eccentricity of the rotating shaft eccentric portion can be increased. Therefore, the design range such as efficiency, reliability, and design freedom can be widened. . In addition, sliding interference between the second bearing member 133 and the inner ring of the rolling bearing 161 does not occur, and it is easy for the lubricating oil to flow into and out of the rolling bearing 161, thereby reducing sliding loss, improving efficiency, Reliability can be improved.

  Further, since the discharge hole 137 is provided not in the second bearing member 133 having the rolling bearing 161 but in the first bearing member 132, there is no interference between the rolling bearing 161 and the discharge hole 137. In the design with 137, the degree of freedom increases, and optimization in design can be easily performed.

  FIG. 3 is a cross-sectional view showing a compression mechanism portion 130A according to a first modification of the present embodiment. 3, the same functional parts as those in FIGS. 1 and 2 are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 3, the second bearing member 133 has a rolling bearing 161 that supports the countershaft portion 143, and an inner diameter of the second bearing member 133 is in contact with the compression chamber of the inner shaft of the rolling bearing 161. A through hole 139a smaller than the outer diameter is provided, and a clearance groove 139b smaller than the outer ring outer shape and larger than the inner ring outer shape is provided between the through hole 139a and the rolling bearing 161.

  By providing the through hole 139a and the relief groove 139b in the second bearing member 133, a seal width (tight width) between the sliding of the second bearing member 133 and the roller 134 can be further ensured. Further reduction. Further, since the diameter of the rolling bearing can be increased and the eccentric amount of the rotating shaft eccentric portion can be increased, the design range such as efficiency, reliability, and design freedom can be widened. In addition, sliding interference between the second bearing member 133 and the inner ring of the rolling bearing 161 does not occur, and it is easy for the lubricating oil to flow into and out of the rolling bearing 161, thereby reducing sliding loss, improving efficiency, Reliability can be improved.

  As described above, the through-hole 139a and the escape groove 139b can secure a seal width as compared with the conventional rotary compressor, thereby further reducing refrigerant leakage. Moreover, since the seal width can be ensured, the eccentric portion 142 and the roller 134 can be made small. For this reason, sliding resistance can be reduced compared with the conventional rotary compressor, and the highly efficient and compact rotary compressor can be formed.

  FIG. 4 is a cross-sectional view showing a compression mechanism portion 130B according to a second modification of the present embodiment. 4, the same functional parts as those in FIGS. 1 to 3 are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 4, the second bearing member 133 has a rolling bearing 161, and a roller 134 is slid between the second bearing member 133 and the cylinder 131 to penetrate smaller than the outer ring outer shape and larger than the inner ring outer shape. A sliding plate 163 having a hole 139c is provided. The valve cover 160, the first bearing member 132, the cylinder 131, the sliding plate 163, and the second bearing member 133 are fixed with bolts 162.

  As described above, by providing the sliding plate 163 between the second bearing member 133 and the cylinder 131, a minute deformation of the sliding surface that occurs when the rolling bearing 161 is press-fitted into the second bearing member 133, Since the minute deformation or the like generated in the periphery of the rolling bearing 161 when the rolling bearing is subjected to a load during operation does not occur on the sliding surface, it is possible to prevent deterioration of the sealing performance due to the roller 134 and the sliding surface.

  FIG. 5 is a cross-sectional view showing a compression mechanism portion 130C according to a third modification of the present embodiment. 5, the same functional parts as those in FIGS. 1 to 3 are denoted by the same reference numerals, and detailed description thereof is omitted.

  In this modification, the inner diameter difference between the diameter D1 of the pressure groove 138 of the first bearing member 132 and the diameter D2 of the through hole 139 of the second bearing member 133 shown in FIG. Thus, by setting the inner diameter difference between the diameter D1 of the pressure groove 138 of the first bearing member 132 and the diameter D2 of the through hole 139 of the second bearing member 133 to 5% or less, the sliding surface of the roller 134 In contrast, almost the same pressure is applied in the axial direction (direction toward the eccentric portion 142) from the pressure groove 138 of the first bearing member 132 and the through groove 139 of the second bearing member 133, and the pressure applied to the sliding surface of the roller 134 It is possible to almost eliminate the difference. For this reason, the pressure which presses the roller 134 to either one of the axial directions is not generated, and the sliding loss due to the pressing of the roller 134 can be reduced.

  FIG. 6 is a cross-sectional view showing a configuration of a refrigeration cycle apparatus 1A according to a second embodiment of the present invention and a rotary compressor 100A incorporated in the refrigeration cycle 1A. In FIG. 6, the same functional parts as those in FIGS. 1 to 3 are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the rotary compressor 100A, the compression mechanism unit 130D has two cylinders. In such a two-cylinder compression mechanism portion 130D, the second discharge hole 137A of the second cylinder 131B is provided in the partition plate 164 provided between the first cylinder 131A and the second cylinder 131B, whereby the first implementation described above is performed. It becomes the compression mechanism part 130D of 2 cylinders which can exhibit the effect similar to the refrigerating-cycle apparatus 1 which concerns on this form.

  The present invention is not limited to the above embodiment. For example, in the above-described example, the roller 134 is engaged with the eccentric portion 142 of the shaft 140, but the present invention can also be applied to the case where the roller 134 is engaged with the eccentric portion 142 via a rolling bearing. Further, although the rolling bearing 161 is provided in the auxiliary bearing 143, the present invention can be applied even when the rolling bearing is provided in the main bearing 141 or when the rolling bearing is provided in both the main bearing 141 and the auxiliary bearing 143. Furthermore, although it has been described that the refrigeration cycle apparatus 1 includes the rotary compressor 100, the condenser 200, the expansion device 300, the evaporator 400, and the accumulator 500, it can also be applied to a case where a four-way valve is further provided.

  Further, if the main shaft portion 141 and the sub shaft portion 143 of the shaft 140 are on the same axis, even if the shaft diameter is the same, by using the above-described example, it is possible to reduce the size, reduce the sliding resistance, and increase the efficiency. It is possible to have effects such as. In addition, various modifications can be made without departing from the scope of the present invention.

Sectional drawing which shows the structure of the refrigeration cycle apparatus which concerns on the 1st Embodiment of this invention, and the rotary compressor integrated in this refrigeration cycle. Sectional drawing which shows the compression mechanism part of the rotary compressor. Sectional drawing which shows the compression mechanism part which concerns on the 1st modification of this invention. Sectional drawing which shows the compression mechanism part which concerns on the 2nd modification of this invention. Sectional drawing which shows the compression mechanism part which concerns on the 3rd modification of this invention. Sectional drawing which shows the structure of the refrigerating-cycle apparatus which concerns on the 2nd Embodiment of this invention, and the rotary compressor integrated in this refrigerating cycle.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Refrigeration cycle apparatus, 100 ... Rotary compressor, 101 ... Discharge port, 110 ... Sealing case, 110a ... Upper bearing, 120 ... Electric motor part, 121 ... Rotor, 122 ... Stator, 130 ... Compression mechanism part, 131 ... Cylinder 132 ... first bearing member 133 ... second bearing member 134 ... roller 135 ... spring 136 ... vane 137 ... discharge hole 138 ... pressure groove 139 ... through hole 140 ... shaft 141 ... main shaft , 142: eccentric part, 143: countershaft part, 160 ... valve cover, 161 ... rolling bearing, 162 ... bolt, 200 ... condenser, 300 ... expansion device, 400 ... evaporator.

Claims (4)

A sealed case;
An electric motor provided in the sealed case;
A cylinder forming a cylinder chamber;
A main shaft portion that is coupled to the electric motor portion, passes through the cylinder chamber, and is pivotally supported by a first bearing member; a countershaft portion that is pivotally supported by a second bearing member; and an eccentric portion that is positioned in the cylinder chamber; A shaft having
In a rotary compressor including a roller engaged with the eccentric portion of the shaft,
While forming one of the main shaft portion and the sub shaft portion of the shaft to be smaller in diameter than the other,
The first or second bearing member that supports one shaft portion with a large shaft diameter is formed by a slide bearing, and the first or second bearing supports the other shaft portion with a small shaft diameter. A rotary compressor characterized in that a rolling bearing is provided on a member.   2. The rotary compression according to claim 1, wherein, of the first bearing member and the second bearing member, only a bearing member having a slide bearing has a discharge hole for discharging a refrigerant compressed in the cylinder chamber. Machine.   The rotary compression according to claim 1 or 2, wherein a difference in inner diameter of each side hole provided on a side surface of the first bearing member and the second bearing member in contact with the cylinder chamber is 5% or less. Machine. The rotary compressor according to any one of claims 1 to 3,
A condenser connected to the rotary compressor;
An expansion device connected to the condenser;
A refrigeration cycle apparatus comprising: an evaporator connected to the expansion device.

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