JP2012251485A - Rotary compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an inexpensive rotary compressor which secures high reliability in fixation of an injection copper tube to an intermediate partition board.SOLUTION: In the rotary compressor, which includes first and second compression units arranged on a top of and under the intermediate partition board in a compressor casing, sucks in refrigerant gas from a low-pressure side of a refrigeration cycle, compresses it, and discharges it to the high-pressure side of the refrigeration cycle, the intermediate partition board is provided with a vertical hole which communicates with the first and second compression units, and a horizontal hole which communicates with the vertical hole and which allows the clearance-fitting of the injection copper tube for injection of a refrigerant liquid to the first and second compression units. After a front end of the injection copper tube is loose-fitted into the horizontal hole, a cylindrical injection liner, which has a throttling hole and the outside diameter of which is larger than an inside diameter of the injection copper tube, is inserted into the injection copper tube from a back end and pressed in to the front end, and the front end of the injection copper tube, which is loose-fitted into the horizontal hole, is diameter-enlarged and tightly fitted in the horizontal hole.

Description

  The present invention relates to a rotary compressor used in a refrigeration cycle of an air conditioner.

  Conventionally, in a hermetic rotary compressor in which an electric element and a rotary compression element having two cylinders driven by the electric element are arranged in a hermetic container, the electric compressor is fixed to an injection copper pipe by pressure bonding or welding. The mounting bracket is accurately positioned at the center in the thickness direction of the intermediate partition plate sandwiched between the two cylinders, and the inner diameter of the small vertical through hole for ejection of the intermediate partition plate and the length to the upper and lower cylinders are equal. Then, the cooling liquid of the hermetic rotary compressor is disclosed in which the refrigerant liquid is ejected to the cylinder in the same amount, and the fitting for fixing the injection copper pipe is attached to the intermediate partition plate by a screw method. (For example, refer to Patent Document 1).

JP-A-7-127575

  However, according to the above conventional technique, when fixing the mounting bracket to the injection copper pipe by crimping, the injection copper pipe is soft, so the fixing reliability is low. When fixing by welding, the welded part is caused by the vibration of the rotary compressor. There is a problem that stress is concentrated on the surface and the reliability of fixing is low. Further, when the mounting bracket is attached to the intermediate partition plate by a screw method, there is a problem that the cost is increased due to the screw processing.

  The present invention has been made in view of the above, and an object of the present invention is to obtain a low-cost rotary compressor with high reliability of fixing an injection copper pipe to an intermediate partition plate.

  In order to solve the above-described problems and achieve the object, the present invention includes first and second compression parts stacked on the upper and lower sides of an intermediate partition plate in a compressor casing, and from the low pressure side of the refrigeration cycle. In the rotary compressor that sucks and compresses the refrigerant gas and discharges it to the high-pressure side of the refrigeration cycle, the intermediate partition plate has a vertical hole that communicates with the first and second compression portions, and communicates with the vertical hole. A lateral hole for clearance fitting the injection copper pipe for injecting the refrigerant liquid into the first and second compression parts is provided, and after the end of the injection copper pipe is clearance fit into the lateral hole, the throttle hole is A cylindrical injection liner having an outer diameter larger than the inner diameter of the injection copper tube is inserted from the rear end portion into the injection copper tube and press-fitted to the front end portion, and the injection fit into the lateral hole. And enlarged the tip of ® down copper tube, characterized in that let tight fit in the transverse bore.

  According to the present invention, there is an effect that a rotary compressor having a high reliability in fixing an injection copper tube to an intermediate partition plate and having a low cost can be obtained.

FIG. 1 is a longitudinal sectional view showing a rotary compressor to which the present invention is applied. FIG. 2 is a cross-sectional view of the first and second compression units. FIG. 3 is a partially enlarged longitudinal sectional view showing a compression portion of an embodiment of the rotary compressor according to the present invention. FIG. 4 is an enlarged view of a portion A in 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 a rotary compressor to which the present invention is applied, FIG. 2 is a transverse sectional view of first and second compression sections, and FIG. 3 is a rotary compression according to the present invention. FIG. 4 is a partially enlarged longitudinal sectional view showing a compression portion of an embodiment of the machine, and FIG. 4 is an enlarged view of a portion A in FIG.

  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 are provided with first and second suction holes 135S and 135T, first and second vane grooves 128S and 128T, and first and second back pressure chambers 129S and 129T, respectively. Annular first and second cylinders 121S and 121T having first and second projecting portions 122S and 122T are provided.

  As shown in FIGS. 1 and 2, circular first and second cylinder inner walls 123 </ b> S and 123 </ b> T are formed on the first and second cylinders 121 </ b> S and 121 </ b> T concentrically with the motor 11. 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, in an airtight and slidable manner.

  As shown in FIG. 2, the first and second vane grooves 128 </ b> S and 128 </ b> T communicate with the first and second vane grooves 128 </ b> S and 128 </ b> T from the outer peripheries of the first and second overhanging parts 122 </ b> S and 122 </ b> T at the back of the first and second vane grooves 128 </ b> S and 128 </ b> T. Thus, 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. Normally, due to the repulsive force of the vane springs, the first and second vanes 127S and 127T protrude from the first and second vane grooves 128S and 128T into the first and second working chambers 130S and 130T, and the tips thereof. Are in contact with the outer peripheral surfaces of the first and second annular pistons 125S and 125T, and the first and second working chambers 130S and 130T (compression spaces) are first and second by the first and second vanes 127S and 127T. It is divided into two suction chambers 131S and 131T and first and second compression chambers 133S and 133T.

  In addition, the first and second cylinders 121S and 121T are connected to the interiors of the compressor housing 10 through the inner portions of the first and second vane grooves 128S and 128T through the opening R shown in FIG. First and second back pressure chambers 129S and 129T are formed by introducing the compressed refrigerant gas in the body 10 and applying back pressure to the first and second vanes 127S and 127T by the pressure of the refrigerant gas.

  The first and second suction chambers 122S and 122T of the first and second cylinders 121S and 121T have first and second suction chambers for sucking refrigerant from the outside into the first and second suction chambers 131S and 131T, respectively. First and second suction holes 135S and 135T are provided for communicating 131S and 131T with the outside.

  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 move in the first and second cylinders 121S and 121T counterclockwise in FIG. 2 along the first and second cylinder inner walls 123S and 123T. Revolving and 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 200S that prevents 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. 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.

  The first and second through holes 101 and 102 are passed through the outer peripheral wall of the cylindrical compressor housing 10 in order from the lower part in the axial direction so as to pass the first and second suction pipes 104 and 105. Is provided. 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 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.

  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 unit 12 by a blade pump (not shown) inserted in the lower part of the rotary shaft 15, and lubricates the sliding parts, and places where the compression space of the compressed refrigerant is partitioned by a minute gap. Have a seal.

  Next, with reference to FIG.3 and FIG.4, the characteristic structure of the rotary compressor 1 of an Example is demonstrated. As shown in FIG. 3, the intermediate partition plate 140 has a vertical hole 141 communicating with the first and second working chambers 130 </ b> S and 130 </ b> T of the first and second compression units 12 </ b> S and 12 </ b> T, and a horizontal communication with the vertical hole 141. A lateral hole 143 is provided, which communicates via the hole 142 and allows the tip end 144a of the injection copper tube 144 for liquid injection to be loosely fitted. The inner diameter of the horizontal communication hole 142 is smaller than the inner diameter of the horizontal hole 143, and is thicker than the inner diameter (for example, 1.0φ) of a throttle hole 145a of an injection liner 145 described later. Since the vertical hole 141 formed at a position away from the horizontal hole 143 is connected to the horizontal hole 143 by the horizontal communication hole 142 having a small inner diameter, the horizontal hole 143 having a large inner diameter is directly connected to the vertical hole 141. Easy to machine. Further, when the injection copper tube 144 and the injection liner 145 are assembled, the distal end portion 144a of the injection copper tube 144 and the distal end portion of the injection liner 145 abut against the end face of the lateral hole 143, so that assembly is good.

  After the front end 144a of the injection copper tube 144 that has passed through the compressor housing 10 is loosely fitted into the horizontal hole 143, a cylindrical injection liner 145 having a throttle hole 145a and an outer diameter larger than the inner diameter of the injection copper tube 144. Is inserted into the injection copper tube 144 from the rear end portion 144b and press-fitted to the front end portion 144a, and the distal end portion 144a of the injection copper tube 144 that is loosely fitted in the horizontal hole 143 is expanded to fit into the horizontal hole 143. . An injection communication tube 146 is connected to the rear portion 144b of the injection copper tube 144 when the refrigeration cycle is assembled.

  As shown in FIG. 4, for example, when the outer diameter a of the injection copper tube 144 is 6.35φ, the inner diameter b is 4.75φ, and the wall thickness c is 0.8 mm, the inner diameter d of the lateral hole 143 is 6.5φ ( The outer diameter e of the injection liner 145 is about + 0.2φ larger than the inner diameter b of the injection copper tube 144 to 4.95φ, so that the distal end portion 144a of the injection copper tube 144 is formed into a horizontal hole. 143 can be pressed (tightening allowance 0.05 mm) and firmly and airtightly fixed.

  The injection liner 145 is preferably manufactured from an iron-based material (for example, carbon steel S45C, S50C, etc.) in terms of workability and rigidity. A throttle hole 145a (for example, an inner diameter of 1.0φ) of the injection liner 145 suppresses an excessive injection amount of the first and second compression portions 12S and 12T into the first and second working chambers 130S and 130T. At the same time, it can have the role of a capillary tube that is a narrow tube that suppresses the backflow of the compressed refrigerant.

  According to the rotary compressor 1 of the embodiment described above, the reliability of fixing the injection copper tube 144 to the intermediate partition plate 140 is high, and since no screw fixing method or capillary tube is used, low cost rotary compression is possible. A machine is obtained.

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 101 1st through-hole 102 2nd through-hole 104 1st suction pipe 105 2nd suction | inhalation Pipe 107 Discharge pipe (discharge part)
111 Stator 112 Rotor 12S 1st compression part 12T 2nd compression part 121S 1st cylinder 121T 2nd cylinder 122S 1st overhang part 122T 2nd overhang part 123S 1st cylinder inner wall 123T 2nd cylinder inner wall 124S 1st 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 back pressure chamber 129T Second back pressure chamber 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 141 Vertical hole 142 Horizontal communication hole 143 Horizontal Hole 144 Inject Copper pipe 144a front end portion 144b rear end portion 145 injection liner 145a throttle hole 146 injection connecting pipe 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 portion 170S Lower muffler cover 170T Upper muffler cover 175 Bolt 180S Lower muffler chamber 180T Upper muffler chamber 190S First discharge hole 190T Second discharge hole 200S First discharge valve 200T Second discharge valve 201S First discharge valve presser 201T Second discharge valve presser 252 Accum holder 253 Accum band 255 System connection pipe 257 Bottom through-hole R Opening of first and second back pressure chambers

Claims (3)

The compressor housing includes first and second compression units stacked on the upper and lower sides of the intermediate partition plate, and sucks and compresses refrigerant gas from the low pressure side of the refrigeration cycle and discharges it to the high pressure side of the refrigeration cycle. In the compressor,
A gap between a vertical hole communicating with the first and second compression parts and an injection copper pipe for injecting a refrigerant liquid into the first and second compression parts through the vertical hole in the intermediate partition plate. A cylindrical hole that has a throttle hole and an outer diameter larger than the inner diameter of the injection copper tube is provided after the injection copper tube is fitted into the horizontal hole. Rotary compression characterized by being inserted into a copper tube from the rear end portion and press-fitted to the front end portion, and expanding the diameter of the front end portion of the injection copper tube that has been loosely fitted into the horizontal hole to fit into the horizontal hole. Machine.   2. The rotary compressor according to claim 1, wherein the horizontal hole communicates with the vertical hole through a lateral communication hole that is narrower than the lateral hole. The rotary compressor according to claim 1, wherein the injection liner is made of an iron-based material.

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