JP5929050B2 - Rotary compressor - Google Patents

Description

  The present invention relates to a rotary compressor having two cylinders.

  Conventionally, first and second cylinders superposed with a partition plate interposed therebetween, two bearings superposed on the outer surfaces of these first and second cylinders, and rotatably supported by these bearings In the rotary compressor having a rotating shaft for rotating the roller provided in the cylinder, two or more first through holes are provided in any one of the bearings, and these first through holes are accommodated. A second through hole formed with an internal thread portion into which a bolt inserted from the first through hole is screwed is formed in the first cylinder, and a partition plate and a second plate corresponding to the second through hole are formed. A rotary compressor is disclosed in which third and fourth through holes having substantially the same diameter are formed in two cylinders, and spring pins (positioning pins) are inserted over the second, third and fourth through holes. And it is (for example, see Patent Document 1).

  Further, the motor unit provided in the hermetic container, and a compression mechanism unit coupled to the motor unit via a rotation shaft, the compression mechanism unit supports a main bearing and a sub-bearing that support the rotation shaft. A rotary compressor in which the first and second cylinders are separated by a partition plate, and the second cylinder is inserted into the first cylinder with the partition plate interposed therebetween. A fastening bolt for fixing to the cylinder, a connection hole penetrating the first and second cylinders and the partition plate, and an inner diameter of the communication hole of the partition plate being the communication hole of the first and second cylinders. The communication hole determines the position of the partition plate with reference to the communication hole of one of the first and second cylinders, and is inserted into the communication hole of the partition plate. A rotary compressor with a tapered tip at the positioning jig It is shown (for example, see Patent Document 2).

Japanese Patent Laid-Open No. 02-123294 JP 2001-329983 A

  However, according to the conventional technique disclosed in Patent Document 1, there is a problem that the cost of the spring pin and the cost of constricting the through hole for inserting the pin into the partition plate and the cylinder are increased. According to the conventional technique disclosed in Patent Document 2, in addition to a bolt hole for a fastening bolt that interposes a partition plate and fixes a second cylinder to the first cylinder, a communication hole for a positioning jig There is a problem that it is expensive to squeeze the first and second cylinders and the partition plate.

  This invention is made | formed in view of the above, Comprising: It aims at obtaining the rotary compressor with high alignment precision of a compression part at low cost.

In order to solve the above-described problems and achieve the object, the present invention is provided with a compressor casing, a lower end in the compressor casing, and an upper end plate, a second cylinder, and an intermediate partition plate from the upper side to the lower side. A first and second low-pressure connecting pipes, each of which includes a compression section in which a first cylinder and a lower end plate are stacked, and a motor disposed in an upper part of the compressor casing and driving the compression section via a rotating shaft. In the rotary compressor that sucks and compresses the refrigerant gas from the compressor and discharges it to the discharge pipe, the second cylinder is provided with at least four screw holes, the upper end plate, the intermediate partition plate, the first cylinder, and the lower end plate Are provided with at least four bolt through holes communicating with each other via at least four screw holes of the second cylinder, and two of the at least four bolt through holes of the intermediate partition plate are provided with two bolt through holes. Hole Is formed from through-holes smaller in diameter, before Symbol bottom plate, first Cylinders and intermediate partition plate, respectively from the bottom plate side at least four bolts through holes including two small-diameter bolt insertion hole in said partition plate s is inserted, the bolt through holes are by Ri fixed in through-bolt which is screwed into the screw holes of the second cylinder respectively communicating, characterized in that.

  According to the present invention, there is an effect that a rotary compressor with high alignment accuracy of the compression unit can be obtained at low cost.

FIG. 1 is a longitudinal sectional view showing an embodiment of a rotary compressor according to the present invention. FIG. 2 is a cross-sectional view of the first and second compression units. FIG. 3 is an exploded perspective view showing the second cylinder and the intermediate partition plate of the rotary compressor of the embodiment. FIG. 4 is an exploded perspective view showing another form of the second cylinder and the intermediate partition plate of the rotary compressor of the embodiment. FIG. 5 is an exploded perspective view showing still another form of the second cylinder and the intermediate partition plate of the rotary compressor of the embodiment. FIG. 6 is an exploded vertical sectional view in which the top and bottom of the compression unit of the rotary compressor of the embodiment are reversed. FIG. 7 is a vertical sectional view with the top and bottom reversed showing an assembled state of the upper muffler cover, upper end plate, second cylinder, rotating shaft, rotor, and intermediate partition plate of the rotary compressor of the embodiment. FIG. 8 is a top view of FIG.

  Embodiments of a rotary compressor according to the present invention will be described below in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

  FIG. 1 is a longitudinal sectional view showing an embodiment of a rotary compressor according to the present invention, and FIG. 2 is a transverse sectional view of first and second compression sections.

  As shown in FIG. 1, the rotary compressor 1 according to the first embodiment is provided with a compression unit 12 installed at a lower portion of a sealed vertical cylindrical compressor housing 10 and an upper portion of the compressor housing 10. And a motor 11 that drives the compression unit 12 via the rotating shaft 15.

  The stator 111 of the motor 11 is fixed by being shrink-fitted on the inner peripheral surface of the compressor housing 10. The rotor 112 of the motor 11 is disposed at the center of the stator 111 and is fixed by being shrink-fitted to a rotating shaft 15 that mechanically connects the motor 11 and the compression unit 12.

  The compression unit 12 includes a first compression unit 12S and a second compression unit 12T that is installed in parallel with the first compression unit 12S and stacked on the upper side of the first compression unit 12S. As shown in FIG. 2, the first and second compression parts 12S and 12T include first and second suction holes 135S and 135T, and first and second vane grooves 128S and 128T, respectively, Second cylinders 121S and 121T are provided.

  As shown in FIG. 2, circular first and second cylinder inner walls 123 </ b> S and 123 </ b> T are formed in the first and second cylinders 121 </ b> S and 121 </ b> T concentrically with the rotating shaft 15 of the motor 11. In the first and second cylinder inner walls 123S and 123T, first and second annular pistons 125S and 125T having an outer diameter smaller than the cylinder inner diameter are arranged, respectively, and the first and second cylinder inner walls 123S and 123T, The first and second working chambers 130S and 130T (compression spaces) are formed between the first and second annular pistons 125S and 125T for sucking, compressing and discharging the refrigerant gas.

  First and second vane grooves 128S and 128T are formed in the first and second cylinders 121S and 121T in the radial direction from the first and second cylinder inner walls 123S and 123T over the entire cylinder height. Flat plate-like first and second vanes 127S and 127T are slidably fitted into the second vane grooves 128S and 128T, respectively.

  As shown in FIG. 2, the first and second vane grooves 128S and 128T are communicated with the first and second vane grooves 128S and 128T from the outer periphery of the first and second cylinders 121S and 121T at the back of the first and second vane grooves 128S and 128T. First and second spring holes 124S and 124T are formed. Vane springs (not shown) that press the back surfaces of the first and second vanes 127S and 127T are inserted into the first and second spring holes 124S and 124T. When the rotary compressor 1 is started, the first and second vanes 127S and 127T are moved from the first and second vane grooves 128S and 128T to the first and second working chambers 130S and 130T by the repulsive force of the vane springs. The first and second working chambers 130S and 130T (compression space) are projected by the first and second vanes 127S and 127T. Is divided into first and second suction chambers 131S and 131T and first and second compression chambers 133S and 133T.

  In addition, the first and second cylinders 121S and 121T communicate with the inner portions of the first and second vane grooves 128S and 128T and the interior of the compressor housing 10 through the opening R shown in FIG. First and second pressure introducing passages 129S and 129T are formed in which the compressed refrigerant gas in the housing 10 is introduced and back pressure is applied to the first and second vanes 127S and 127T by the pressure of the refrigerant gas. .

  In the first and second cylinders 121S and 121T, the first and second suction chambers 131S and 131T communicate with the outside in order to suck the refrigerant from the outside into the first and second suction chambers 131S and 131T. Second suction holes 135S and 135T are provided.

  Further, as shown in FIG. 1, an intermediate partition plate 140 is installed between the first cylinder 121S and the second cylinder 121T, and the second operation of the first working chamber 130S of the first cylinder 121S and the second cylinder 121T. The room 130T is partitioned. A lower end plate 160S is installed at the lower end of the first cylinder 121S, and closes the first working chamber 130S of the first cylinder 121S. An upper end plate 160T is installed at the upper end of the second cylinder 121T, and closes the second working chamber 130T of the second cylinder 121T.

  A lower bearing portion 161S is formed on the lower end plate 160S, and the lower bearing support portion 151 of the rotary shaft 15 is rotatably supported by the lower bearing portion 161S. An upper bearing portion 161T is formed on the upper end plate 160T, and an upper bearing support portion 153 of the rotary shaft 15 is rotatably supported by the upper bearing portion 161T.

  The rotating shaft 15 includes a first eccentric portion 152S and a second eccentric portion 152T that are offset by 180 ° from each other. The first eccentric portion 152S is a first annular portion of the first compression portion 12S. The second eccentric portion 152T is rotatably fitted to the second annular piston 125T of the second compression portion 12T.

  When the rotary shaft 15 rotates, the first and second annular pistons 125S and 125T revolve in the first and second cylinders 121S and 121T in the clockwise direction of FIG. 2 along the first and second cylinder inner walls 123S and 123T. Then, following this, the first and second vanes 127S and 127T reciprocate. Due to the movement of the first and second annular pistons 125S and 125T and the first and second vanes 127S and 127T, the volumes of the first and second suction chambers 131S and 131T and the first and second compression chambers 133S and 133T are continuous. The compressor 12 continuously sucks, compresses and discharges the refrigerant gas.

  As shown in FIG. 1, a lower muffler cover 170S is arranged below the lower end plate 160S, and a lower muffler chamber 180S is formed between the lower end plate 160S and the lower muffler cover 170S. And the 1st compression part 12S is opened to lower muffler room 180S. That is, a first discharge hole 190S (see FIG. 2) that connects the first compression chamber 133S of the first cylinder 121S and the lower muffler chamber 180S is provided in the vicinity of the first vane 127S of the lower end plate 160S. A first discharge valve (not shown) for preventing the backflow of the compressed refrigerant gas is disposed in the hole 190S.

  The lower muffler chamber 180S is one chamber formed in an annular shape, and the lower end plate 160S, the first cylinder 121S, the intermediate partition plate 140, the second cylinder 121T, and the upper end plate 160T are arranged on the discharge side of the first compression unit 12S. This is a part of the communication passage that communicates with the upper muffler chamber 180T through the refrigerant passage 136 (see FIG. 2) that passes through the upper muffler chamber. The lower muffler chamber 180S reduces the pressure pulsation of the discharged refrigerant gas.

  As shown in FIG. 1, an upper muffler cover 170T is installed above the upper end plate 160T, and an upper muffler chamber 180T is formed between the upper end plate 160T and the upper muffler cover 170T. In the vicinity of the second vane 127T of the upper end plate 160T, a second discharge hole 190T (see FIG. 2) that communicates the second compression chamber 133T of the second cylinder 121T and the upper muffler chamber 180T is provided, and the second discharge hole 190T. Is provided with a second discharge valve (not shown) for preventing the backflow of the compressed refrigerant gas. The upper muffler chamber 180T reduces the pressure pulsation of the discharged refrigerant.

  The first cylinder 121S, the lower end plate 160S, the lower muffler cover 170S, the second cylinder 121T, the upper end plate 160T, the upper muffler cover 170T, and the intermediate partition plate 140 are integrally fastened by a through bolt 175 and an upper end plate bolt 176 ( The assembling method of the members constituting these compression parts 12 will be described later). Of the compression part 12 integrally fastened by the through bolt 175 and the upper end plate bolt 176, the outer peripheral part of the upper end plate 160T is fixed to the compressor casing 10 by spot welding, and the compression section 12 is fixed to the compressor casing 10. It is fixed.

  First and second through holes (not shown) pass through the outer peripheral wall of the cylindrical compressor housing 10 in the axial direction and in order from the bottom through the first and second suction pipes 104 and 105. It is provided for. Further, an accumulator 25 made of an independent cylindrical sealed container is held by an accumulator holder 252 on the outer side of the compressor housing 10.

  A system connection tube 255 connected to the refrigeration cycle is connected to the center of the top of the accumulator 25, and one end of the bottom through hole (not shown) provided in the bottom of the accumulator 25 extends to the upper part inside the accumulator 25. The first and second low-pressure communication pipes 31S and 31T are connected to the other ends of the first and second suction pipes 104 and 105.

  The first and second low-pressure connecting pipes 31S and 31T that guide the low-pressure refrigerant of the refrigeration cycle to the first and second compression parts 12S and 12T through the accumulator 25 are the first and second suction pipes 104, The first and second cylinders 121S and 121T are connected to the first and second suction holes 135S and 135T (see FIG. 2) via the 105. That is, the first and second suction holes 135S and 135T communicate in parallel with the low pressure side of the refrigeration cycle.

  A discharge pipe 107 is connected to the top of the compressor housing 10 as a discharge unit that is connected to the refrigeration cycle and discharges high-pressure refrigerant gas to the refrigeration cycle. That is, the first and second discharge holes 190S and 190T communicate with the refrigeration cycle. A power terminal block 115 that supplies power to the motor 11 is disposed at the top of the compressor housing 10.

  Lubricating oil is sealed in the compressor housing 10 up to the height of the second cylinder 121T. Further, the lubricating oil circulates in the compression section 12 by a blade pump (not shown) inserted in the lower part of the rotating shaft 15, and the compression space of the compressed refrigerant is partitioned by lubrication of sliding parts and a minute gap Have a seal.

  Next, a characteristic configuration of the rotary compressor 1 according to the embodiment will be described with reference to FIGS. FIG. 3 is an exploded perspective view showing the second cylinder and the intermediate partition plate of the rotary compressor of the embodiment, and FIG. 4 is an exploded perspective view showing another form of the second cylinder and the intermediate partition plate. 5 is an exploded perspective view showing still another embodiment of the second cylinder and the intermediate partition plate, FIG. 6 is an exploded vertical sectional view in which the top and bottom of the compression unit are reversed, and FIG. 7 is an upper muffler cover, FIG. 8 is a vertical cross-sectional view of the top plate, the second cylinder, the rotating shaft, the rotor, and the intermediate partition plate in an inverted state, and FIG. 8 is a top view of FIG.

  As shown in FIGS. 2 and 3, the body portion of the second cylinder 121T is provided with five screw holes 121Tn at substantially equal intervals. Further, as shown in FIG. 6, the upper muffler cover 170T, the upper end plate 160T, the intermediate partition plate 140, the first cylinder 121S, the lower end plate 160S, and the lower muffler cover 170S each have five screw holes 121Tn of the second cylinder 121T. Are provided with five bolt through holes 121a (in the embodiment, five screw holes 121Tn and five bolt through holes 121a are provided, but four or six may be provided). Further, the first cylinder 121S is provided with two screw holes 121Sn at positions different from the five bolt through holes 121a (see FIG. 2), and the lower end plate 160S has the first cylinder Two bolt through holes 160Sa communicating with the two screw holes 121Sn of 121S are provided.

  Of the five bolt through holes 121a of the intermediate partition plate 140, the inner diameters of the two bolt through holes 121b are smaller than the inner diameters of the other bolt through holes 121a, and +0.4 mm (several numbers) from the outer diameter of the through bolts 175. Precisely formed in large diameter (100 micron order). As shown in FIGS. 3 to 5, the two bolt through holes 121 b are preferably provided at positions that are not adjacent to each other (positions that are separated from each other).

  As shown in FIG. 4 to FIG. 6, among the five screw holes 121Tn of the second cylinder 121T, on the insertion side of the through bolt 175 of the screw hole 121Tn communicating with the two small diameter bolt through holes 121b of the intermediate partition plate 140, A tapered portion 121Tt may be provided. Further, as shown in FIGS. 5 and 6, a tapered portion 121Tt may be provided also on the insertion side of the through bolt 175 of the two small diameter bolt through holes 121b of the intermediate partition plate 140.

  Next, with reference to FIGS. 1-8, the assembly method of the compression part 12 of the rotary compressor 1 of an Example is demonstrated. As shown in FIG. 6, first, as a first step, five upper end plate bolts 176 are passed through the five bolt through holes 121a of the upper muffler cover 170T and the upper end plate 160T, respectively, and the 5 of the second cylinder 121T. The upper end plate 160T and the second cylinder 121T are aligned and fixed with an alignment accuracy of ± 0.003 mm (several microns) by an automatic aligning and assembling apparatus, and the second cylinder set 121TK. And

  Next, as shown in FIG. 6, as a second step, the two lower end plate bolts 177 in which the lower end plate 160S and the first cylinder 121S are screwed into the screw holes 121Sn through the bolt through holes 160Sa and the above self-aligning. The first cylinder set 121SK is obtained by aligning and fixing with an aligning accuracy of ± 0.003 mm (several microns order) by an assembling apparatus.

  Next, as shown in FIGS. 6 to 8, as the third step, the second annular piston 125S, the second vane 127T (see FIG. 2) and the rotating shaft 15 are assembled to the second cylinder set 121TK, The intermediate partition plate 140 is placed on the top. In this state, the positional accuracy of the intermediate partition plate 140 with respect to the second cylinder set 121TK may be about ± 1.5 mm by eye examination.

  Next, as shown in FIG. 6, as a fourth step, a first cylinder set 121SK in which a first annular piston 125S and a first vane 127S (see FIG. 2) are assembled is placed on the intermediate partition plate 140. Then, the lower muffler cover 170S is placed thereon.

  Next, as shown in FIG. 6, as a fifth step, five through bolts 175 are inserted into the five bolt through holes 121a and 121b of the lower muffler cover 170S, the first cylinder set 121SK, and the intermediate partition plate 140, respectively. It inserts and it screws in five screw holes 121Tn of the 2nd cylinder 121T, and fastens the compression part 12 whole.

  Since the lower end plate 160S and the upper end plate 160T are aligned and fastened by an automatic alignment assembly device with alignment accuracy of ± 0.003 mm (several microns order) with the rotation shaft 15 as a reference axis, the first cylinder 121S and the second cylinder 121T are fastened with alignment accuracy of ± 0.006 mm (on the order of several microns).

  Of the five bolt through holes 121a of the intermediate partition plate 140, two are made into small diameter bolt through holes 121b, and the through bolts 175 are inserted so that the intermediate partition plate 140 and the second cylinder 121T are ± 0.2 mm. Can be fastened with alignment accuracy of several hundred microns. Since the alignment accuracy of the first cylinder 121S and the second cylinder 121T is ± 0.006 mm, the first cylinder 121S and the intermediate partition plate 140 also have alignment accuracy of ± 0.2 mm (several hundred microns order). It is concluded.

  The rotary compressor 1 of the embodiment has five through bolts 175, and two of the five bolt through holes 121a of the intermediate partition plate 140 that are not adjacent to each other are small-diameter bolt through holes 121b. The distance between the small-diameter bolt passage holes 121b is increased, and the displacement in the rotation direction of the intermediate partition plate 140 with respect to the first and second cylinders 121S and 121T (the displacement around the through bolt 175) can be reduced. The alignment accuracy of the second cylinders 121S and 121T and the intermediate partition plate 140 can be further improved.

  Further, as shown in FIGS. 4 to 7, the screw hole 121Tn of the second cylinder 121T and the bolt insertion hole 121a of the intermediate partition plate 140 are respectively inserted into the bolt insertion side with a diameter difference larger than a general chamfer of 3 mm or more. By providing the taper part 121Tt, even if the intermediate partition plate 140 or the second cylinder 121T is displaced by about ± 1.5 mm with respect to the first cylinder 121S, the through bolt 175 is pressed against the taper part 121Tt and shifted. Can be aligned.

  In this case, if all the bolt through holes 121a of the intermediate partition plate 140 through which the four or more through bolts 175 are passed have a small diameter, it is necessary to increase the relative positional accuracy between the bolt through holes 121a, thereby increasing the processing cost. Only the two bolt through holes 121a are used as small-diameter bolt through holes 121b, and the intermediate partition plate 140 is aligned through the two bolt through holes 121b and through the through bolts 175.

  According to the rotary compressor 1 of the embodiment described above, the intermediate partition plate 140 and the first and second cylinders 121S and 121T are set to a predetermined size by reducing the diameter of the two bolt through holes 121b of the intermediate partition plate 140. Can be fastened with a centering accuracy of ± 0.2 mm (on the order of several hundred microns). Therefore, the first and second annular pistons 125S and 125T have an appropriate seal width H (see FIG. 1) that seals the high pressure portion and the low pressure portion while being in sliding contact with the intermediate partition plate 140 (1.5 mm to 3.0 mm). Therefore, the variation in performance of the rotary compressor 1 can be reduced at a low cost.

DESCRIPTION OF SYMBOLS 1 Rotary compressor 10 Compressor housing | casing 11 Motor 12 Compression part 15 Rotating shaft 25 Accumulator 31S 1st low pressure connection pipe 31T 2nd low pressure connection pipe 104 1st suction pipe 105 2nd suction pipe 107 Discharge pipe (discharge part)
111 Stator 112 Rotor 115 Power Terminal Block 12S First Compression Part 12T Second Compression Part 121S First Cylinder 121Sn Screw Hole 121T Second Cylinder 121a Bolt Through Hole 121b Small Diameter Bolt Through Hole 121Tn Screw Hole 121Tt Tapered Part 121SK First Cylinder assembly 121TK Second cylinder assembly 123S First cylinder inner wall 123T Second cylinder inner wall 124S First spring hole 124T Second spring hole 125S First annular piston 125T Second annular piston 127S First vane 127T Second vane 128S First vane groove 128T second vane groove 129S first pressure introduction path 129T second pressure introduction path 130S first working chamber 130T second working chamber 131S first suction chamber 131T second suction chamber 133S first compression chamber 133T 2 Compression chamber 135S First suction hole 135T Second suction hole 136 Refrigerant passage 140 Intermediate partition plate 151 Lower bearing support part 152S First eccentric part 152T Second eccentric part 153 Upper bearing support part 160S Lower end plate 160Sa Bolt through hole 160T Upper end plate 161S Lower bearing portion 161T Upper bearing portion 170S Lower muffler cover 170T Upper muffler cover 175 Through bolt 176 Upper end plate bolt 177 Lower end plate bolt 180S Lower muffler chamber 180T Upper muffler chamber 190S First discharge hole 190T Second discharge hole 252 Accum holder 255 System connection pipe R Opening portion of first and second pressure introducing passages H Seal width in which first and second annular pistons and intermediate partition plate are in sliding contact with each other

Claims (5)

A compressor housing;
A compression unit that is disposed in the lower part of the compressor casing and from above to below, in which an upper end plate, a second cylinder, an intermediate partition plate, a first cylinder, and a lower end plate are stacked;
A motor disposed in the upper part of the compressor housing and driving the compression unit via a rotation shaft;
A rotary compressor that sucks and compresses refrigerant gas from the first and second low-pressure communication pipes and discharges the refrigerant gas to the discharge pipe.
The second cylinder is provided with at least four screw holes,
Each of the upper end plate, the intermediate partition plate, the first cylinder and the lower end plate is provided with at least four bolt through holes communicating with each other via at least four screw holes of the second cylinder,
Of the at least four bolt through holes of the intermediate partition plate, two bolt through holes are formed with a smaller diameter than the other bolt through holes ,
Before Symbol bottom plate, first Cylinders and the intermediate partition plate is at least four bolts through each inserted into hole includes two small-diameter bolt insertion hole in said partition plate from said lower plate side, the bolt insertion hole Ri by the through-bolt which is screwed into the screw holes of the second cylinder to respectively communicate are fixed,
A rotary compressor characterized by that.   The rotary compressor according to claim 1, wherein the two small-diameter bolt through holes of the intermediate partition plate are provided at positions that are not adjacent to each other.   The rotary compressor according to claim 1 or 2, wherein a taper portion is provided on a through bolt insertion side of two small diameter bolt through holes of the intermediate partition plate.   The tapered portion is provided on the through bolt insertion side of the two screw holes of the second cylinder respectively communicating with the two small diameter bolt through holes of the intermediate partition plate. The rotary compressor as described in one.   The rotary compressor according to claim 3 or 4, wherein a difference between the maximum diameter and the minimum diameter of the tapered portion is 3 mm or more in diameter.

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