JP6064726B2 - Rotary compressor - Google Patents

Description

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

  The rotary compressor is fitted into an annular cylinder having suction holes and vane grooves formed radially on the side, an end plate that closes the end of the cylinder, and an eccentric part of a rotating shaft that is rotated by a motor. An annular piston that revolves along the cylinder inner wall of the cylinder and forms a working chamber with the cylinder inner wall, and protrudes from the vane groove provided in the cylinder into the working chamber and comes into contact with the annular piston. And a vane partitioning the suction chamber and the compression chamber, and a discharge hole for discharging the compressed refrigerant in the compression chamber to the outside of the compression chamber is provided in the vicinity of the vane groove of the end plate.

  In the rotary compressor having the above structure, until the annular piston revolves in the cylinder and the contact between the annular piston and the cylinder inner wall passes through the vane groove and moves to the end of the suction hole on the vane groove side, A closed chamber (reference numeral 132T in FIG. 4) is formed between the annular piston and the inner wall of the cylinder. The closed chamber has a problem that the volume gradually increases with the movement of the annular piston and the inside becomes a vacuum state, and the driving power of the rotary compressor increases.

  In order to solve this problem, conventionally, a working chamber is formed in the cylinder, and an annular piston that rotates in accordance with the eccentric rotation of the eccentric portion of the rotating shaft is provided in the working chamber, and the working chamber is compressed. In a rotary compressor in which a vane partitioned into a chamber and a suction chamber is slidably mounted in a vane groove formed in the cylinder in accordance with the eccentric rotation of the annular piston, the cylinder inner wall opening of the vane groove A rotary compressor is disclosed in which the suction side chamfer is sized to cover the suction hole (see, for example, Patent Document 1).

  Further, a compression chamber surrounded by a cylinder and an upper end plate and a lower end plate fixed to both surfaces of the cylinder, an annular piston inscribed in the compression chamber and performing an eccentric rotational movement, and a vane groove provided in the cylinder are slid. A rotary compressor that includes a vane that is movably fitted and has a tip that is pressed against the annular piston to partition the compression chamber into a high-pressure side and a low-pressure side, and a suction hole that is provided in the cylinder and opens into the compression chamber. Discloses a rotary compressor in which an inner wall of the cylinder is provided with a groove communicating the vane groove and the suction hole (see, for example, Patent Document 2).

JP 2012-87665 A Japanese Utility Model Publication No. 2-14492

  However, according to the conventional technique disclosed in Patent Document 1, the suction side wall surface of the vane groove that is largely chamfered is a pressure-receiving surface of the pressing force of the compressed refrigerant that acts on the vane. There is a problem that the dynamic pressure increases and the wear of the vane grooves increases. In addition, the vane tends to be inclined with respect to the wall surface of the vane groove, the sliding surface pressure locally increases, wear of the vane groove increases, and the behavior of the vane becomes unstable. .

  Further, according to the conventional technique disclosed in Patent Document 2, a special processing tool such as a T-shaped slotter is required to process the groove that communicates the vane groove and the suction hole on the inner wall of the cylinder. There is a problem that there is a cost increase. Further, there is a problem that the vane groove is shortened, the vane pressure receiving area is reduced, and the wear of the vane groove is increased.

  The present invention has been made in view of the above, and it is possible to prevent an increase in the driving power of the rotary compressor due to the vacuum chamber being in a vacuum state, and without increasing the wear of the vane groove. It is an object of the present invention to obtain a rotary compressor that does not become unstable and does not require a special processing tool for processing a cylinder.

  In order to solve the above-described problems and achieve the object, the present invention includes two annular cylinders that are radially provided with suction holes and vane grooves and stacked with an intermediate partition plate therebetween. Between the end plate that closes the end of the cylinder and the eccentric part of the rotating shaft that is driven to rotate by the motor, revolves along the cylinder inner wall of the cylinder, and revolves between the annular cylinder and the cylinder inner wall. An annular piston that forms a working chamber, and a vane that protrudes from the vane groove provided in the cylinder into the working chamber and abuts against the annular piston to divide the working chamber into a suction chamber and a compression chamber, In the rotary compressor having a compression portion formed by providing a discharge hole communicating with the compression chamber on the side opposite to the suction hole near the vane groove of the end plate, on the suction hole side near the vane groove of the intermediate partition plate, One silin A closing chamber formed while the contact point between the annular piston and the cylinder inner wall of the working chamber moves from the vane groove to the vane side end of the suction hole, and the suction chamber of the other cylinder. A through hole for communication is formed.

  According to the present invention, it is possible to prevent the closed chamber from being in a vacuum state and increase the driving power of the rotary compressor, and the wear of the vane groove does not increase and the behavior of the vane does not become unstable. As a result, it is possible to obtain a rotary compressor that does not require a special processing tool for processing the cylinder.

FIG. 1 is a longitudinal sectional view showing an embodiment of a rotary compressor according to the present invention. FIG. 2 is a plan view seen from above showing a second compression unit of the embodiment of the rotary compressor according to the present invention. FIG. 3 is an enlarged view of a portion A in FIG. FIG. 4 is an enlarged view of a portion B in FIG. FIG. 5 is a cross-sectional view taken along the line CC of FIG. FIG. 6 is a plan view seen from above showing the first compression section of the embodiment of the rotary compressor according to the present invention. FIG. 7 is a plan view of the intermediate partition plate of the 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.

  FIG. 1 is a longitudinal sectional view showing an embodiment of a rotary compressor according to the present invention, and FIG. 2 is a plan view seen from above showing a second compression section of the embodiment of the rotary compressor according to the present invention. FIG. 6 is a plan view seen from above showing the first compression section of the embodiment of the rotary compressor according to the present invention.

  As shown in FIG. 1, the rotary compressor 1 according to the embodiment is disposed 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 rotary shaft 15.

  The stator 111 of the motor 11 is formed in a cylindrical shape, and 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 inside the cylindrical 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 arranged 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 are arranged on the first and second side projecting parts 122S and 122T in a radial manner with the first and second suction holes 135S and 135T, , Annular first and second cylinders 121S and 121T provided with second vane grooves 128S and 128T are provided. The first and second cylinders 121S and 121T are provided with first and second lateral protrusions 122St and 122Tt at positions 180 degrees away from the first and second vane grooves 128S and 128T, respectively.

  As shown in FIGS. 2 and 6, 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 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 FIGS. 2 and 6, the first and second vane grooves 128 </ b> S and 128 </ b> T are connected to the first and second vane grooves 128 </ b> S and 128 </ b> T from the outer periphery of the first and second cylinders 121 </ b> S and 121 </ b> T. First and second spring holes 124S and 124T are formed so as to communicate with each other. First and second vane springs 126S and 126T 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, respectively.

  When the rotary compressor 1 is started, the first and second vane 127S and 127T are moved from the first and second vane grooves 128S and 128T to the first by the repulsive force of the first and second vane springs 126S and 126T. , Projecting into the second working chambers 130S, 130T, the tips of which are in contact with the outer peripheral surfaces of the first and second annular pistons 125S, 125T, and the first and second vanes 127S, 127T act as the first and second actuations. The chambers 130S and 130T are 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 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. In order to ensure the mechanical strength of the wall portions of the first and second vane grooves 128S and 128T, the first and second vane grooves 128S and 128T and the first and second suction holes 135S and 135T are arranged in the circumferential direction. A little apart.

  Also, as shown in FIG. 1, an intermediate partition plate 140 is disposed between the first cylinder 121S and the second cylinder 121T, and the first working chamber 130S (see FIG. 6) of the first cylinder 121S and the second cylinder The second working chamber 130T (see FIG. 2) of the cylinder 121T is partitioned and closed. A lower end plate 160S is disposed 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 disposed at the upper end portion of the second cylinder 121T, and closes the second working chamber 130T of the second cylinder 121T.

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

  The rotating shaft 15 includes a first eccentric portion 152S and a second eccentric portion 152T that are eccentric with a phase difference of 180 ° from each other. The first eccentric portion 152S is connected to the first annular piston 125S 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, in the vicinity of the first vane 127S of the lower end plate 160S, a first discharge hole 190S (see FIG. 6) that communicates the first compression chamber 133S of the first cylinder 121S and the lower muffler chamber 180S is provided. In the hole 190S, a reed valve type first discharge valve 200S for preventing the backflow of the compressed refrigerant gas is disposed.

  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. Is a part of a communication path that communicates with the inside of the upper muffler chamber 180T through a refrigerant path 136 (see FIGS. 2 and 6). 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. The first discharge hole 190S, the first discharge valve 200S, and the first discharge valve presser 201S constitute a first discharge valve portion of the lower end plate 160S.

  As shown in FIG. 1, an upper muffler cover 170T is arranged 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 reed valve type 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 second discharge hole 190T, the second discharge valve 200T, and the second discharge valve presser 201T constitute a second discharge valve portion of the upper end plate 160T.

  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 plurality of through bolts 175 and the like. Out of the compression portion 12 that is integrally fastened by a through bolt 175 or the like, 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 tube 255 connected to the evaporator 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 are connected in parallel to the evaporator of the refrigeration cycle.

  Connected to the top of the compressor housing 10 is a discharge pipe 107 that is connected to the refrigeration cycle and discharges high-pressure refrigerant gas to the condenser side of the refrigeration cycle. That is, the first and second discharge holes 190S and 190T are connected to the condenser 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 is sucked up from the oil supply pipe 16 attached to the lower end portion of the rotating shaft 15 by a blade pump (not shown) inserted in the lower portion of the rotating shaft 15, circulates through the compressing portion 12, and slides. The moving parts are lubricated and a minute gap in the compression portion 12 is sealed.

  Next, a characteristic configuration of the rotary compressor according to the embodiment will be described with reference to FIGS. 3 is an enlarged view of part A of FIG. 2, FIG. 4 is an enlarged view of part B of FIG. 3, FIG. 5 is a sectional view taken along the line CC of FIG. 3, and FIG. It is a top view of the intermediate partition plate of an Example.

  As described above, the rotating shaft 15 rotates counterclockwise in FIG. 2, and the first and second annular pistons 125S and 125T move along the first and second cylinder inner walls 123S and 123T. The cylinders 121S and 121T revolve counterclockwise.

  The first and second annular pistons 125S and 125T are connected to the first and second cylinder inner walls 123S and 123T from the positions of the first and second vane grooves 128S and 128T, as shown in FIG. The first and second annular pistons 125S and 125T move in accordance with the movement of the first and second annular pistons 125S and 125T until the suction holes 135S and 135T move to the positions of the first and second vane side ends 135St and 135Tt. First and second closed chambers 132S and 132T formed by the pistons 125S and 125T and the first and second cylinder inner walls 123S and 123T and the first and second vanes 127S and 127T (see FIG. 4, first) , The volume of the second working chambers 130S and 130T) gradually increases.

  A through hole 140A is formed on the side of the first and second suction holes 135S and 135T in the vicinity of the first and second vane grooves 128S and 128T of the intermediate partition plate 140 that closes the first and second closing chambers 132S and 132T. ing. The vane side end portion 140At of the through hole 140A is positioned in the vicinity of the wall surfaces of the first and second vane grooves 128S and 128T on the first and second suction holes 135S and 135T side. The suction hole side end portion 140Aa of the through hole 140A is connected to the first and second vane side end portions 135St and 135Tt of the first and second suction holes 135S and 135T and the first and second vane grooves 128S and 128T. The second suction holes 135S and 135T are positioned in the middle of the wall surface. The radial arrangement position of the through hole 140A is such that the center of the through hole 140A is positioned in the vicinity of the first and second cylinder inner walls 123S and 123T.

  During driving of the first and second compression parts 12S and 12T, the contact points between the first and second annular pistons 125S and 125T and the first and second cylinder inner walls 123S and 123T are connected to the first and second vane grooves 128S. , 128T, when the first and second vane side end portions 135St, 135Tt of the first and second suction holes 135S, 135T shown in FIG. 4 are moved, the volumes of the first and second closed chambers 132S, 132T are moved. Gradually increases, and the first and second closed chambers 132S and 132T become negative pressure, but the through-hole 140A has the first and second closed chambers 132S and 132T and the second and first suction chambers 131T and 131S ( 6), the low-pressure refrigerant flows from the second and first suction chambers 131T and 131S into the first and second closed chambers 132S and 132T, and the negative pressure is eliminated.

  The contact points between the first and second annular pistons 125S and 125T and the first and second cylinder inner walls 123S and 123T further move, and the first and second vane side ends of the first and second suction holes 135S and 135T. When passing through 135St and 135Tt, the first and second closed chambers 132S and 132T communicate with the first and second suction holes 135S and 135T to become the first and second suction chambers 131S and 131T.

  The contact points between the first and second annular pistons 125S and 125T and the first and second cylinder inner walls 123S and 123T further move, and the first and second opposite vane side ends of the first and second suction holes 135S and 135T. The first and second working chambers 130S and 130T on the anti-vane groove side of the contact point between the first and second annular pistons 125S and 125T and the first and second cylinder inner walls 123S and 123T are first, The communication with the second suction holes 135S and 135T is cut off to form the first and second compression chambers 133S and 133T.

  According to the rotary compressor of the embodiment described above, the opening portions of the first and second vane grooves 128S and 128T are not chamfered so that the sliding surface pressure of the first and second vanes 127S and 127T does not increase. The wear of the first and second vane grooves 128S and 128T does not increase. Further, the first and second vanes 127S and 127T are not easily inclined with respect to the wall surfaces of the first and second vane grooves 128S and 128T, and wear of the wall surfaces is increased, and the behavior of the first and second vanes 127S and 127T is increased. Does not become unstable.

  Further, the first and second cylinder inner walls 123S and 123T of the first and second cylinders 121S and 121T have openings of the first and second vane grooves 128S and 128T and the openings of the first and second suction holes 135S and 135T. Since the groove communicating with the portion is not processed, a special processing tool such as a T-shaped slotter is not required, and the manufacturing can be performed at low cost.

  Moreover, although the Example demonstrated the Example of the 2 cylinder type rotary compressor, the rotary compressor of this invention is applicable also to a 2 stage | paragraph compression type rotary compressor.

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 First Compression Unit 12T Second Compression Unit 121S First Cylinder (Cylinder)
121T 2nd cylinder (cylinder)
123S 1st cylinder inner wall (cylinder inner wall)
123T 2nd cylinder inner wall (cylinder inner wall)
124S first spring hole 124T second spring hole 125S first annular piston (annular piston)
125T second annular piston (annular piston)
127S 1st vane (vane)
127T 2nd vane (vane)
128S 1st vane groove (vane groove)
128T 2nd vane groove (vane groove)
129S first pressure introduction path 129T second pressure introduction path 130S first working chamber (working chamber)
130T second working chamber (working chamber)
131S First suction chamber (suction chamber)
131T Second suction chamber (suction chamber)
132S 1st closed room (closed room)
132T 2nd closed room (closed room)
133S 1st compression chamber (compression chamber)
133T Second compression chamber (compression chamber)
135S 1st suction hole (suction hole)
135St first vane side end portion 135T second suction hole (suction hole)
135Tt Second vane side end portion 136 Refrigerant passage 140 Intermediate partition plate 140A Through hole 140At Vane side end portion 140Aa Suction hole side end portion 151 Sub shaft portion 152S First eccentric portion (eccentric portion)
152T second eccentric part (eccentric part)
153 Main shaft portion 160S Lower end plate (end plate)
160T Top plate (end plate)
161S Sub bearing portion 161T Main bearing portion 170S Lower muffler cover 170T Upper muffler cover 175 Through bolt 180S Lower muffler chamber 180T Upper muffler chamber 190S First discharge hole (discharge hole)
190T Second discharge hole (discharge hole)
200S 1st discharge valve 200T 2nd discharge valve 201S 1st discharge valve holder 201T 2nd discharge valve holder 252 Accum holder 253 Accum band 255 System connection pipe R Opening part of 1st, 2nd pressure introduction path

Claims (1)

Two annular cylinders which are provided with suction holes and vane grooves radially on the side and stacked with an intermediate partition plate in between;
An end plate for closing the end of the cylinder;
An annular piston that is fitted to an eccentric portion of a rotating shaft that is driven to rotate by a motor, revolves along the cylinder inner wall of the cylinder and forms an operation chamber between the cylinder inner wall and the cylinder inner wall;
A vane that protrudes from the vane groove provided in the cylinder into the working chamber and abuts against the annular piston and divides the working chamber into a suction chamber and a compression chamber;
In the rotary compressor having a compression part formed by providing a discharge hole communicating with the compression chamber on the side opposite to the suction hole near the vane groove of the end plate,
While the contact point between the annular piston and the inner wall of the working chamber of one cylinder moves from the vane groove to the vane side end of the suction hole on the suction hole side near the vane groove of the intermediate partition plate A rotary compressor characterized in that a through hole is formed to communicate the closed chamber formed in the cylinder and the suction chamber of the other cylinder.

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