JP2011208553A - Rotary compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a rotary compressor preventing leakage of discharged refrigerant gas from the outer peripheral portion of a closed part and the end of a lower bearing part and reducing the amount of lubricating oil discharged outside of a compressor casing.SOLUTION: The rotary compressor has a lower muffler chamber 180S formed below a compression section by a lower end plate 160S having the lower bearing part 161S and the closed part 162S and by a lower muffler cover 170S. An end plate stepped portion 166S is formed at the end of the closed part 162S over the entire circumference, and a bearing part stepped portion 167S is formed at the end of the lower bearing part 161S over the entire circumference. An end plate side inner flange 171S is formed on a closed part 162S side of the lower muffler cover 170S, and a bearing part side inner cylindrical part 172S is formed on a lower bearing part 161S side. The end plate side inner flange 171S is made to abut on the end plate stepped portion 166S, the bearing part side inner cylindrical part 172S is made to abut on the bearing part stepped portion 167S, and the lower muffler cover 170S is fastened into pressure contract with the lower end plate 160S by bolts 175.

Description

  The present invention relates to a rotary compressor used in a refrigeration cycle such as a refrigeration apparatus or an air conditioner.

  Conventionally, an airtight container, an electric motor housed in the airtight container, a compressor portion driven by the electric motor, a lower end plate having a lower bearing portion and a closing portion of the compressor portion, and a lower muffler cover In the hermetic compressor in which the lower muffler chamber is formed, whether the closed portion side of the lower muffler cover is fitted to the outer peripheral portion of the closed portion and the lower bearing portion side is contacted to the outer peripheral portion of the lower bearing portion. Alternatively, a hermetic compressor that is brought into contact with a plate-like member fixed to the lower bearing portion is disclosed (for example, see Patent Document 1).

  A crankshaft; a roller disposed on an outer periphery of the eccentric portion of the crankshaft; a cylinder defining a cylinder chamber in which the roller is disposed; and a bearing portion for supporting the crankshaft, A rotary compressor including an upper end plate and a lower end plate sandwiching the cylinder and the roller from an axial direction side of a crankshaft, wherein the lower end plate includes a lower bearing portion and a closing portion extending outward from the lower bearing portion And a discharge port provided in the closing part, and the lower end plate holds the lower end plate and the discharge port by holding between the lower bearing part and the closing part based on elastic force. A lower muffler cover fixed to the lower end plate is attached so as to cover, and the bearing boss side of the lower muffler cover abuts over the entire circumference at the axial front end surface of the lower bearing portion. Alternatively, a rotary compressor is disclosed in which the outer periphery of the lower bearing portion contacts the entire periphery, and the closed portion side of the lower muffler cover contacts the entire periphery of the closed portion of the outer periphery. (For example, refer to Patent Document 2).

Japanese Patent Application Laid-Open No. 08-312565 JP 2008-196322 A

  However, according to the above conventional technique, the closed portion side of the lower muffler cover is externally fitted to the outer peripheral portion of the closed portion. Therefore, only a part of the inner peripheral part of the lower muffler cover on the closed part side comes into contact with the outer peripheral part of the closed part, and the part fitted by the pressure of the discharged refrigerant gas is pushed open, and the outer periphery of the closed part is The sealing performance of the part is poor. Therefore, the refrigerant gas discharged to the lower muffler chamber leaks into the lubricating oil from the outer peripheral portion of the closed portion, and the lubricating oil is mixed into the discharged refrigerant gas and discharged to the refrigeration cycle outside the compressor casing, There is a problem that the amount of lubricating oil decreases.

  The present invention has been made in view of the above, and prevents leakage of refrigerant gas discharged from the outer periphery of the closed portion and the end of the lower bearing portion, and reduces the amount of lubricating oil discharged outside the compressor housing. An object of the present invention is to obtain a rotary compressor.

  In order to solve the above-described problems and achieve the object, the present invention includes a vertically-placed cylindrical compressor housing that is provided with a refrigerant discharge portion at the top and a refrigerant suction portion at the bottom and is sealed, A compressor that is installed in the lower part of the compressor casing and sucks refrigerant gas from the low-pressure side of the refrigeration cycle through the suction section and discharges refrigerant gas from the discharge section to the high-pressure side of the refrigeration cycle through the compressor casing. A lower end plate that is installed on the upper portion of the compressor housing and that drives the compression unit via a rotation shaft, and has a lower bearing portion and a closing portion on the lower side of the compression unit; In the rotary compressor in which the lower muffler chamber is formed by the lower muffler cover, an end plate step portion is formed over the entire circumference on the outer peripheral portion of the closed portion, and a bearing is formed over the entire circumference at the end portion of the lower bearing portion. Forming a stepped portion and closing the lower muffler cover The end plate side inner flange is formed on the lower bearing portion side, the bearing portion side inner cylinder portion is formed on the lower bearing portion side, the end plate side inner flange is brought into contact with the end plate step portion, and the bearing portion step portion is contacted with the bearing portion step portion. The lower inner muffler cover is fastened with a bolt so that the lower inner muffler cover is brought into pressure contact with the lower end plate.

  The rotary compressor according to the present invention has an effect of preventing leakage of refrigerant gas discharged from the outer peripheral portion of the closed portion and the end of the lower bearing portion, and reducing the amount of lubricating oil discharged outside the compressor housing. .

1 is a longitudinal sectional view showing a first 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 a longitudinal sectional view showing the structure of the lower muffler chamber of the first embodiment. FIG. 4 is a plan view of the lower muffler cover of the first embodiment. FIG. 5 is a longitudinal sectional view showing the structure of the lower muffler chamber of the second embodiment.

  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.

  1 is a longitudinal sectional view showing a first embodiment of a rotary compressor according to the present invention, FIG. 2 is a transverse sectional view of first and second compression sections, and FIG. FIG. 4 is a longitudinal sectional view showing a structure of a lower muffler chamber, and FIG. 4 is a plan view of a lower muffler cover of the first embodiment.

  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. The first and second compression sections 12S and 12T include short cylindrical first and second cylinders 121S and 121T.

  As shown in FIG. 2, circular first and second cylinder inner walls 123 </ b> S and 123 </ b> T are formed concentrically with the motor 11 in the first and second cylinders 121 </ b> S and 121 </ b> T. In the first and second cylinder inner walls 123S and 123T, annular 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 and 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 fitted in the second vane grooves 128S and 128T, respectively.

  Although not shown, first and second springs are disposed in the inner part of the first and second vane grooves 128S and 128T. Normally, due to the repulsive force of the first and second springs, the first and second vanes 127S and 127T are moved from the first and second vane grooves 128S and 128T into the first and second working chambers 130S and 130T. The first and second working chambers 130S and 130T (compression spaces) are projected by the first and second vanes 127S and 127T. The chamber is partitioned 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 compressor housing 10 through the inner portions of the first and second vane grooves 128S and 128T, and the first and second vanes 127S and 127T communicate with each other. Further, back pressure introduction passages 129S and 129T for applying a back pressure by the pressure of the compressed refrigerant gas are formed.

  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 piston 125S is rotatably held, and the second eccentric portion 152T rotatably holds 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 installed below the lower end plate 160S, and a lower muffler chamber 180S is formed between the lower end plate 160S. 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. In the hole 190S, a first discharge valve 200S that prevents the backflow of the compressed refrigerant gas is installed.

  The lower muffler chamber 180S is one chamber communicated 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. In addition, a first discharge valve presser 201S for limiting the amount of flexure opening of the first discharge valve 200S is fixed to the first discharge valve 200S together with the first discharge valve 200S by a rivet.

  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 200T for preventing the backflow of the compressed refrigerant gas.

  In addition, a second discharge valve presser 201T for limiting the deflection opening amount of the second discharge valve 200T is fixed to the second discharge valve 200T by a rivet together with the second discharge valve 200T. 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 bolts 175. Out of the compression portion 12 that is integrally fastened by the bolt 175, the outer peripheral portion of the upper end plate 160T is fixed to the compressor housing 10 by spot welding, and the compression portion 12 is fixed to the compressor housing 10.

  Although not shown, first and second through holes 101 and 102 are provided in the outer peripheral wall of the cylindrical compressor casing 10 in the axial direction and in order from the lower part, and the first and second suction pipes 104 and 105. It is provided to pass through. In addition, an accumulator 25 formed of an independent cylindrical sealed container is held by an accumulator holder 252 and an accumulator band 253 on the outer side of the compressor housing 10.

  A system connection pipe 255 connected to the low pressure side of the refrigeration cycle is connected to the center of the top of the accumulator 25, and one end of the bottom through hole 257 provided at the bottom of the accumulator 25 extends to the upper part inside the accumulator 25. The other ends of the first and second suction pipes 104 and 105 are connected to the first and second low-pressure communication pipes 31S and 31T.

  The first and second low-pressure communication 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 connected to the first and second suction pipes as suction parts. Are connected to the first and second suction holes 135S and 135T (see FIG. 2) of the first and second cylinders 121S and 121T. That is, the first and second suction holes 135S and 135T communicate in parallel with the low pressure side of the refrigeration cycle.

  Connected to the top of the compressor housing 10 is a discharge pipe 107 that is connected to the high-pressure side of the refrigeration cycle and discharges high-pressure refrigerant gas to the high-pressure side of the refrigeration cycle. That is, the first and second discharge holes 190S and 190T communicate with the high pressure side of the refrigeration cycle.

  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 portion 12 by a blade pump (not shown) inserted in the lower portion of the shaft 15, and seals at locations where the compression space of the compressed refrigerant is partitioned by lubrication of sliding parts and minute gaps. I am doing.

  Next, a characteristic configuration of the rotary compressor 1 according to the first embodiment will be described with reference to FIGS. 1, 3, and 4. A lower muffler chamber 180S is formed below the compression portion 12 by a lower end plate 160S having a lower bearing portion 161S and a closing portion 162S and a lower muffler cover 170S.

  An end plate step 166S is formed on the outer periphery of the closing portion 162S of the lower end plate 160S, and a bearing portion step 167S is formed on the end of the lower bearing portion 161S. . An end plate side inner flange 171S is formed on the closed portion 162S side of the lower muffler cover 170S, and a bearing portion side inner cylinder portion 172S is formed on the lower bearing portion 161S side.

  The end plate side inner flange 171S is brought into contact with the end plate step portion 166S, the bearing portion side inner cylindrical portion 172S is brought into contact with the bearing portion step portion 167S, and the lower muffler cover 170S is pressed against the lower end plate 160S. Thus, the lower muffler chamber 180S is formed by fastening with bolts 175.

  When the refrigerant gas is discharged into the lower muffler chamber 180S configured as described above, the pressure of the refrigerant gas acts to press the end plate side inner flange 171S against the end plate step 166S, and the bearing Lubricating oil discharged to the outside of the compressor housing 10 can act to press the inner cylinder portion 172S against the bearing stepped portion 167S to reduce the amount of refrigerant gas leaked from the lower muffler chamber 180S. The amount of can be reduced. Furthermore, compression efficiency can also be improved by reducing the amount of gas leakage.

  Next, a characteristic configuration of the rotary compressor according to the second embodiment will be described with reference to FIG. FIG. 5 is a longitudinal sectional view showing the structure of the lower muffler chamber of the second embodiment. A lower muffler chamber 180S is formed below the compression portion 12 by a lower end plate 160S having a lower bearing portion 161S and a closing portion 162S and a lower muffler cover 170S.

  An end plate step 166S that extends over the entire circumference is formed on the outer periphery of the closing portion 162S of the lower end plate 160S, and a bearing groove 169S that extends over the entire circumference is formed on the end surface of the lower bearing portion 161S. An end plate side inner flange 171S is formed on the closed portion 162S side of the lower muffler cover 170S, and a bearing portion side inner cylinder portion 172S is formed on the lower bearing portion 161S side.

  The end plate side inner flange 171S is brought into contact with the end plate step portion 166S, the bearing portion side inner cylindrical portion 172S is brought into contact with the bearing portion groove 169S, and the bearing portion end surface 164S is in the vicinity of the bearing portion side inner cylindrical portion 172S. The lower muffler cover 170S is brought into contact with the lower muffler cover 170S, and the lower muffler cover 170S is fastened to the lower end plate 160S by a bolt 175 to form a lower muffler chamber 180S.

  When the refrigerant gas is discharged into the lower muffler chamber 180S configured as described above, the pressure of the refrigerant gas acts to press the end plate side inner flange 171S against the end plate step 166S, and the bearing Since the portion side inner cylinder portion 172S and its vicinity are sealed in contact with each other at two locations, the amount of refrigerant gas leaked from the lower muffler chamber 180S can be reduced and discharged to the outside of the compressor housing 10. The amount of lubricating oil can be reduced. Furthermore, compression efficiency can also be improved by reducing the amount of gas leakage.

  As described above, the rotary compressor according to the present invention is suitable for a rotary compressor used in a refrigeration cycle such as a refrigeration apparatus or an air conditioner.

DESCRIPTION OF SYMBOLS 1 Rotary compressor 10 Compressor housing | casing 11 Motor 12 Compression part 15 Rotating shaft 25 Accumulator 31S, 31T Low-pressure connection pipe 107 Discharge pipe (discharge part)
111 Stator 112 Rotor 12S 1st compression part 12T 2nd compression part 121S 1st cylinder 121T 2nd cylinder 123S 1st cylinder inner wall 123T 2nd cylinder inner wall 125S 1st annular piston 125T 2nd annular piston 127S 1st vane 127T 1st 2-vane 128S first vane groove 128T second vane groove 129S, 129T back pressure introduction path 130S first working chamber 130T second working chamber 131S first suction chamber 131T second suction chamber 133S first compression chamber 133T second compression chamber 135S First suction hole 135T Second suction hole 136 Refrigerant passage 140 Intermediate partition plate 151 Lower bearing support portion 152S First eccentric portion 152T Second eccentric portion 153 Upper bearing support portion 160S Lower end plate 160T Upper end plate 161S Lower bearing portion 161T Upper Bearing part 162S Blocking part 164S Bearing part end surface 166S End plate step part 167S Bearing part step part 169S Bearing part groove 170S Lower muffler cover 170T Upper muffler cover 171S End plate side inner flange 172S Bearing part side inner cylinder part 175 Bolt 180S Lower muffler chamber 180S Upper muffler chamber 190S First discharge hole 190T Second discharge hole 200S First discharge valve 200T Second discharge valve 201S First discharge valve holder 201T Second discharge valve holder 252 Accum holder 253 Accum band 255 System connection pipe 257 Bottom through-hole

Claims (2)

A vertically-placed cylindrical compressor housing which is provided with a refrigerant discharge part at the top and a refrigerant suction part at the bottom and sealed;
A compressor that is installed in the lower part of the compressor casing and sucks refrigerant gas from the low-pressure side of the refrigeration cycle through the suction section and discharges refrigerant gas from the discharge section to the high-pressure side of the refrigeration cycle through the compressor casing. When,
A motor that is installed in an upper portion of the compressor housing and drives the compression unit via a rotation shaft;
A rotary compressor in which a lower muffler chamber is formed by a lower end plate having a lower bearing portion and a closing portion, and a lower muffler cover, on the lower side of the compression portion,
Forming an end plate step over the entire circumference on the outer periphery of the closure, and forming a bearing step over the entire circumference at the end of the lower bearing;
An end plate side inner flange is formed on the closed portion side of the lower muffler cover, a bearing portion side inner cylinder portion is formed on the lower bearing portion side,
The end plate side inner flange is brought into contact with the end plate step portion, the bearing portion side inner cylinder portion is brought into contact with the bearing portion step portion, and the lower muffler cover is pressure-contacted with the lower end plate with a bolt. A rotary compressor characterized by being fastened. A vertically-placed cylindrical compressor housing which is provided with a refrigerant discharge part at the top and a refrigerant suction part at the bottom and sealed;
A compressor that is installed in the lower part of the compressor casing and sucks refrigerant gas from the low-pressure side of the refrigeration cycle through the suction section and discharges refrigerant gas from the discharge section to the high-pressure side of the refrigeration cycle through the compressor casing. When,
A motor that is installed in an upper portion of the compressor housing and drives the compression unit via a rotation shaft;
A rotary compressor in which a lower muffler chamber is formed by a lower end plate having a lower bearing portion and a closing portion, and a lower muffler cover, on the lower side of the compression portion,
An end plate step is formed over the entire circumference on the outer periphery of the closed part, and a bearing groove is formed over the entire circumference on the end surface of the lower bearing part,
An end plate side inner flange is formed on the closed portion side of the lower muffler cover, a bearing portion side inner cylinder portion is formed on the lower bearing portion side,
The end plate side inner flange is brought into contact with the end plate step portion, the bearing portion side inner cylinder portion is brought into contact with the bearing portion groove, and the lower muffler cover in the vicinity of the bearing portion side inner cylinder portion is placed on the bearing portion end surface. A rotary compressor characterized in that an inner surface is brought into contact and the lower muffler cover is fastened with a bolt so as to be in pressure contact with the lower end plate.

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