JP2017053316A - Rotary Compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary compressor that includes an end plate cover capable of suppressing noise due to discharging of refrigerant, without amplifying pressure pulsation of refrigerant.SOLUTION: In a rotary compressor, an upper muffler chamber includes a plurality of overhung parts 181T and a plurality of small-diameter parts 182T; the overhung part is formed so as to overhang from the center of a rotational shaft 15 toward a gap between through bolts, and is provided with a muffler discharge hole 183T; and the small-diameter part connects the overhung parts with each other, and is formed at the more center side of the rotational shaft than the through bolts so as not to interfere with the through holes.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a rotary compressor used for an air conditioner, a refrigerator, and the like.

  In order to suppress noise associated with refrigerant discharge, for example, in Patent Document 1, two muffler discharge holes provided in a muffler member (end plate cover) are provided with a symmetrical sound source and primary resonance with respect to the outer space of the muffler. A muffler member that is arranged at a position that becomes a node of the mode and that is displaced from the position of the antinode of the secondary resonance mode by making the radially extending portion of the muffler asymmetrical with respect to the y-axis orthogonal to the rotation axis Have been described.

Japanese Patent No. 4911147

  However, in the prior art described in Patent Document 1, in order to avoid the position of the antinodes of the primary resonance mode and the secondary resonance mode, the muffler discharge hole is formed on the boss portion (main bearing) of the front head (upper end plate). In the case of a two-cylinder rotary compressor, the refrigerant compressed by the second compression unit and the first muffler and the refrigerant passage compressed by the first compression unit in the second muffler space are arranged in the vicinity of the outer peripheral portion. Thus, a muffler structure is formed in which the pressure pulsation is reduced and refrigerants having different pressure pulsation components easily join. Therefore, there is a problem that the pressure pulsation is amplified and noise increases.

  An object of the present invention is to obtain a rotary compressor including a muffler (end plate cover) capable of suppressing noise accompanying refrigerant discharge without amplifying the pressure pulsation of the refrigerant.

  The present invention includes a vertically mounted cylindrical compressor housing that is provided with a refrigerant discharge portion at an upper portion and a refrigerant suction portion at a lower portion and sealed, and a lower portion of the compressor housing. A compression unit that compresses the sucked refrigerant and discharges the refrigerant from the discharge unit; and a motor that is disposed at an upper portion of the compressor housing and drives the compression unit, and each of the compression units is annular. A first cylinder and a second cylinder, each having a discharge valve portion including a bearing portion and a discharge hole, a lower end plate closing the end portion of the first cylinder, and an upper end plate closing the end portion of the second cylinder; An intermediate partition plate disposed between the first cylinder and the second cylinder and partitioning between the two, a rotating shaft supported by the bearing portion of the upper end plate and the bearing portion of the lower end plate and rotated by the motor; The rotating shafts are set with a phase difference of 180 degrees from each other. A first cylinder chamber is formed between the first eccentric portion and the second eccentric portion, and the first eccentric portion and the first eccentric portion that revolves along the first cylinder inner wall of the first cylinder and revolves along the first cylinder inner wall. A first annular piston to be formed and a second annular chamber which is fitted to the second eccentric portion and revolves along the second cylinder inner wall of the second cylinder to form a second cylinder chamber between the second cylinder inner wall and the second cylinder inner wall. A piston and a first vane groove provided in the first cylinder project into the first cylinder chamber and abut against the first annular piston, thereby dividing the first cylinder chamber into a first suction chamber and a first compression chamber. The second cylinder chamber protrudes from the second vane groove provided in the second cylinder and the second vane groove into the second cylinder chamber and comes into contact with the second annular piston to thereby compress the second cylinder chamber into the second suction chamber and the second compression chamber. The second bay that divides the room The upper end plate having a refrigerant passage hole penetrating the lower end plate and the upper end plate, the first cylinder, the second cylinder and the intermediate partition plate, and a muffler discharge hole communicating with the inside of the compressor housing. The upper end plate cover that covers the upper end of the discharge valve portion and the refrigerant passage hole and forms an upper muffler chamber between the upper end plate and the lower end plate that covers the discharge valve portion of the lower end plate and the lower end of the refrigerant passage hole The cover, the lower end plate cover, the upper end plate cover, the lower end plate, the upper end plate, the first cylinder, the second cylinder, and the intermediate partition plate penetrate through the outer edge portion of the upper end plate cover in a substantially concentric manner. A plurality of bolt holes, and through bolts that are inserted into the bolt holes from the lower plate cover side and fasten the lower plate cover, the lower plate, the first cylinder, the intermediate partition plate, and the second cylinder. And the upper end In the rotary compressor comprising a through bolt inserted into the bolt hole from the plate cover side and fastening the upper end plate cover, the upper end plate, and the second cylinder, the upper muffler chamber has a plurality of overhang portions and a plurality of overhang portions. A small-diameter portion, and the overhang portion is formed so as to protrude from the center of the rotating shaft toward the through bolt and the muffler discharge hole is provided, and the small-diameter portion is provided between the overhang portions. It is formed on the center side of the rotating shaft from the through bolt so as not to interfere with the through bolt.

  The rotary compressor of the present invention does not amplify the pressure pulsation of the refrigerant, and can suppress noise accompanying the refrigerant discharge.

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 compression unit and the second compression unit according to the embodiment as viewed from below. FIG. 3 is a bottom view showing the upper end plate cover of the first embodiment. FIG. 4 is a bottom view illustrating the positional relationship between the upper end plate cover, the discharge valve portion, and the refrigerant passage hole in the first embodiment. FIG. 5 is a graph comparing the noise of a rotary compressor using the upper end plate cover of Example 1 with the noise of a conventional rotary compressor. FIG. 6 is a bottom view showing the upper end plate cover of the second embodiment.

  EMBODIMENT OF THE INVENTION Below, the form (Example) for implementing this invention is demonstrated in detail, referring drawings.

  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 seen from below the first compression section and the second compression section of the embodiment. .

  As shown in FIG. 1, the rotary compressor 1 includes a compression unit 12 disposed at a lower portion of a hermetically sealed cylindrical compressor housing 10 and an upper portion of the compressor housing 10. And a motor 11 that drives the compression unit 12 via 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, and the second compression unit 12T is disposed on the upper side of the first compression unit 12S. As shown in FIG. 2, the first compression unit 12S includes an annular first cylinder 121S. The first cylinder 121S includes a first lateral projecting portion 122S projecting from an annular outer periphery, and the first lateral projecting portion 122S is provided with first suction holes 135S and first vane grooves 128S radially. ing. The second compression unit 12T includes an annular second cylinder 121T. The second cylinder 121T includes a second lateral projecting portion 122T projecting from an annular outer periphery, and the second lateral projecting portion 122T is provided with second suction holes 135T and second vane grooves 128T radially. ing.

  As shown in FIG. 2, a circular first cylinder inner wall 123 </ b> S is formed in the first cylinder 121 </ b> S concentrically with the rotating shaft 15 of the motor 11. A first annular piston 125S having an outer diameter smaller than the inner diameter of the first cylinder 121S is disposed in the first cylinder inner wall 123S, and the refrigerant is sucked between the first cylinder inner wall 123S and the first annular piston 125S. A first cylinder chamber 130S for compressing and discharging is formed. In the second cylinder 121T, a circular second cylinder inner wall 123T is formed concentrically with the rotating shaft 15 of the motor 11. A second annular piston 125T having an outer diameter smaller than the inner diameter of the second cylinder 121T is disposed in the second cylinder inner wall 123T, and the refrigerant is sucked between the second cylinder inner wall 123T and the second annular piston 125T. A second cylinder chamber 130T that discharges after compression is formed.

  The first cylinder 121S is formed with a first vane groove 128S extending in the radial direction from the first cylinder inner wall 123S over the entire cylinder height. A flat plate-like first vane 127S is slid in the first vane groove 128S. It is movably fitted. The second cylinder 121T is formed with a second vane groove 128T extending in the radial direction from the second cylinder inner wall 123T over the entire cylinder height, and a flat plate-like second vane 127T is slid in the second vane groove 128T. It is movably fitted.

  As shown in FIG. 2, a first spring hole 124S is formed on the outer side in the radial direction of the first vane groove 128S so as to communicate with the first vane groove 128S from the outer peripheral portion of the first laterally extending portion 122S. Yes. A first vane spring (not shown) that presses the back surface of the first vane 127S is inserted into the first spring hole 124S. A second spring hole 124T is formed on the radially outer side of the second vane groove 128T so as to communicate with the second vane groove 128T from the outer peripheral portion of the second laterally extending portion 122T. A second vane spring (not shown) that presses the back surface of the second vane 127T is inserted into the second spring hole 124T.

  When the rotary compressor 1 is started, the first vane 127S protrudes from the first vane groove 128S into the first cylinder chamber 130S by the repulsive force of the first vane spring, and the tip thereof is the first annular piston 125S. The first cylinder chamber 130S is partitioned into a first suction chamber 131S and a first compression chamber 133S by the first vane 127S. Similarly, due to the repulsive force of the second vane spring, the second vane 127T protrudes from the second vane groove 128T into the second cylinder chamber 130T, and its tip abuts against the outer peripheral surface of the second annular piston 125T. In contact therewith, the second cylinder chamber 130T is partitioned into a second suction chamber 131T and a second compression chamber 133T by the second vane 127T.

  In addition, the first cylinder 121S communicates the radially outer side of the first vane groove 128S with the inside of the compressor casing 10 through the opening R (see FIG. 1), and the compressed refrigerant in the compressor casing 10 is compressed. And a first pressure introduction path 129S is formed in which back pressure is applied to the first vane 127S by the refrigerant pressure. The compressed refrigerant in the compressor housing 10 is also introduced from the first spring hole 124S. In addition, the second cylinder 121T communicates the radially outer side of the second vane groove 128T with the inside of the compressor casing 10 through an opening R (see FIG. 1), and the compressed refrigerant in the compressor casing 10 is compressed. , And a second pressure introduction path 129T is formed in which back pressure is applied to the second vane 127T by the refrigerant pressure. The compressed refrigerant in the compressor housing 10 is also introduced from the second spring hole 124T.

  The first side overhanging portion 122S of the first cylinder 121S is provided with a first suction hole 135S that allows the first suction chamber 131S to communicate with the outside in order to suck the refrigerant from the outside into the first suction chamber 131S. ing. The second side overhanging portion 122T of the second cylinder 121T is provided with a second suction hole 135T that allows the second suction chamber 131T to communicate with the outside in order to suck the refrigerant from the outside into the second suction chamber 131T. ing. The cross section of the first suction hole 135S and the second suction hole 135T is circular.

  Further, 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 cylinder chamber 130S (see FIG. 2) of the first cylinder 121S and the second cylinder. The second cylinder chamber 130T (see FIG. 2) of 121T is partitioned. The intermediate partition plate 140 closes the upper end portion of the first cylinder 121S and the lower end portion of the second cylinder 121T.

  A lower end plate 160S is disposed at the lower end of the first cylinder 121S and closes the first cylinder chamber 130S of the first cylinder 121S. An upper end plate 160T is disposed at the upper end of the second cylinder 121T, and closes the second cylinder chamber 130T of the second cylinder 121T. The lower end plate 160S closes the lower end portion of the first cylinder 121S, and the upper end plate 160T closes the upper end portion 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 annular piston 125S revolves along the first cylinder inner wall 123S in the first cylinder 121S counterclockwise in FIG. 2, and the first vane 127S reciprocates following this. To do. Due to the movement of the first annular piston 125S and the first vane 127S, the volumes of the first suction chamber 131S and the first compression chamber 133S continuously change, and the compression unit 12 continuously sucks and compresses the refrigerant. Discharge. When the rotary shaft 15 rotates, the second annular piston 125T revolves in the second cylinder 121T in the counterclockwise direction in FIG. 2 along the second cylinder inner wall 123T, and the second vane 127T follows this. Reciprocate. By the movement of the second annular piston 125T and the second vane 127T, the volumes of the second suction chamber 131T and the second compression chamber 133T are continuously changed, and the compression unit 12 continuously sucks and compresses the refrigerant. Discharge.

  As shown in FIG. 1, a lower end plate cover 170S is disposed below the lower end plate 160S, and a lower muffler chamber 180S is formed between the lower end plate 160S and the lower end plate 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. In the hole 190S, a reed valve type first discharge valve 200S for preventing the backflow of the compressed refrigerant is disposed.

  The lower muffler chamber 180S is one chamber, and a refrigerant passage that passes through the lower end plate 160S, the first cylinder 121S, the intermediate partition plate 140, the second cylinder 121T, and the upper end plate 160T on the discharge side of the first compression unit 12S. This is a part of the communication path that communicates with the inside of the upper muffler chamber 180T through the hole 136 (see FIG. 2). The lower muffler chamber 180S reduces the pressure pulsation of the discharged refrigerant. In addition, a first discharge valve presser 201S for limiting the amount of deflection opening of the first discharge valve 200S is fixed to the first discharge valve 200S by a rivet together with the first discharge valve 200S. The first discharge hole 190S, the first discharge valve 200S, and the first discharge valve presser 201S constitute the first discharge valve portion 200SV of the lower end plate 160S. The lower end plate 160S covers the lower ends of the first discharge valve portion 200SV and the refrigerant passage hole 136.

  As shown in FIG. 1, an upper end plate 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 end plate 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. 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 200TV of the upper end plate 160T. The upper end plate 160T covers the upper ends of the second discharge valve portion 200TV and the refrigerant passage hole 136 (details of the upper end plate cover 170T and the upper muffler chamber 180T will be described later).

  The lower end plate cover 170S, the lower end plate 160S, the first cylinder 121S, and the intermediate partition plate 140 are inserted from the lower side and are screwed into female screws provided in the second cylinder 121T (four or more) through bolts 175. Is fastened to the second cylinder 121T. The upper end plate cover 170T and the upper end plate 160T are fastened to the second cylinder 121T by through bolts 175 that are inserted from above and screwed into the female screw provided in the second cylinder 121T. The lower end plate cover 170S, the lower end plate 160S, the first cylinder 121S, the intermediate partition plate 140, the second cylinder 121T, the upper end plate 160T, and the upper end plate cover 170T, which are integrally fastened by a plurality of through bolts 175, etc. It is composed. The outer peripheral portion of the upper end plate 160 </ b> T is fixed to the compressor housing 10 by spot welding in the compression portion 12, and the compression portion 12 is fixed to the compressor housing 10.

  A first through-hole 101 and a second through-hole 102 are provided in the outer circumferential wall of the cylindrical compressor housing 10 in the axial direction and in order from the bottom, and the first suction pipe 104 and the second suction pipe 105 are respectively connected to the outer circumference wall. 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 evaporator of the refrigerant circuit 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 first low-pressure connecting pipe 31S and the second low-pressure connecting pipe 31T, whose other ends are connected to the other ends of the first suction pipe 104 and the second suction pipe 105, respectively, are fixed.

  The first low-pressure communication pipe 31S that guides the low-pressure refrigerant in the refrigerant circuit to the first compression section 12S via the accumulator 25 is connected to the first suction hole 135S ( (See FIG. 2). The second low-pressure communication pipe 31T that guides the low-pressure refrigerant of the refrigerant circuit (refrigeration cycle) to the second compression section 12T via the accumulator 25 is connected to the second cylinder 121T via the second suction pipe 105 serving as a suction section. It is connected to the second suction hole 135T (see FIG. 2). That is, the first suction hole 135S and the second suction hole 135T are connected in parallel to the evaporator of the refrigerant circuit.

  A discharge pipe 107 is connected to the top of the compressor housing 10 as a discharge unit that is connected to a refrigerant circuit (refrigeration cycle) and discharges high-pressure refrigerant to the condenser side of the refrigerant circuit. That is, the first discharge hole 190S and the second discharge hole 190T are connected to the condenser of the refrigerant circuit.

  Lubricating oil is sealed in the compressor housing 10 up to the height of the second cylinder 121T. The lubricating oil is sucked up from an oil supply pipe 16 attached to the lower end of the rotating shaft 15 by a pump blade (not shown) inserted into the lower portion of the rotating shaft 15, circulates through the compressing portion 12, and slides ( The first annular piston 125S and the second annular piston 125T) are lubricated and a minute gap in the compression portion 12 is sealed.

  Next, a characteristic configuration of the rotary compressor according to the first embodiment will be described with reference to FIGS. FIG. 3 is a bottom view showing the upper end plate cover of the first embodiment, and FIG. 4 is a bottom view showing the positional relationship between the upper end plate cover, the discharge valve portion, and the refrigerant passage.

  As shown in FIGS. 3 and 4, the upper end plate cover 170T of the first embodiment is formed by pressing a steel plate into a circular shape in plan view, and a recess 171T is formed as an outline of the upper muffler chamber 180T. Yes. In the flat plate portion 172T constituting the outer edge portion of the upper end plate cover 170T, five bolt holes 173T through which the through bolts 175 are passed are arranged. The five through bolts 175 fasten the upper end plate cover 170T, the upper end plate 160T, and the second cylinder 121T.

  The upper end plate cover 170T covers the upper ends of the second discharge valve portion 200TV and the refrigerant passage hole 136 of the upper end plate 160T (see FIG. 4), and forms an upper muffler chamber 180T between the upper end plate 160T. The upper muffler chamber 180T is connected between the five (plurality) projecting portions 181T projecting between the bolts 175 (bolt holes 173T) radially from the center of the rotary shaft 15 and the projecting bolts 175. And five small diameter portions 182T formed on the center side of the rotary shaft 15 from the through bolt 175 so as not to interfere with the (bolt hole 173T). A muffler discharge hole 183T is provided in each of the five overhang portions 181T. The muffler discharge hole 183T allows the upper muffler chamber 180T to communicate with the inside of the compressor housing 10.

  As shown in FIG. 4, the second discharge hole 190T constituting the second discharge valve section 200TV and the refrigerant passage hole 136 that communicates the lower muffler chamber 180S and the upper muffler chamber 180T are the overhanging portion 181T of the upper muffler chamber 180T. Is open. The second discharge hole 190T and the refrigerant passage hole 136 are disposed at positions opposite to each other with respect to the rotation shaft 15. In order to reduce the pressure pulsation of the discharged refrigerant by causing the discharged refrigerant discharged from the first and second discharge holes 190S and 190T to spread in the upper muffler chamber 180T, the total area of the five muffler discharge holes 183T is The total area of the first and second discharge holes 190S and 190T is not more than the total area.

  In the rotary compressor 1 according to the first embodiment, the upper muffler chamber 180T passes radially from the center of the rotary shaft 15 and extends between the bolts 175 (bolt holes 173T), and between each of the overhang portions 181T. And a plurality of small diameter portions 182T formed on the center side of the rotary shaft 15 from the through bolt 175 so as not to interfere with the through bolt 175 (bolt hole 173T). The muffler discharge hole 183T has a plurality of overhangs. The second discharge hole 190T and the refrigerant passage hole 136 of the second discharge valve portion 200TV of the upper end plate 160T that are provided in each of the portions 181T and open into the upper muffler chamber 180T are opposite to each other with respect to the rotation shaft 15. Since the refrigerant is discharged from the second discharge hole 190T, the refrigerant discharged from the second discharge hole 190T is disposed on the overhanging portion 181T. Is discharged into the compressor housing 10 from the 83t, refrigerant discharged from the refrigerant passage hole 136 is discharged into the compressor housing 10 from the placed muffler discharge hole 183T to the refrigerant passage hole 136 side.

  Therefore, in the upper muffler chamber 180T, the pressure compressed by the second compression unit 12T and the pressure pulsation component reduced by the lower muffler chamber 180S and the refrigerant passage hole 136 compressed by the first compression unit 12S are generated. It is difficult for the different refrigerants to merge with each other, the pressure pulsation of the refrigerant is not amplified, and the increase in noise accompanying the amplification of the pressure pulsation can be suppressed.

  FIG. 5 is a graph comparing the noise of a rotary compressor using the upper end plate cover of Example 1 with the noise of a conventional rotary compressor, with a center frequency of 100 [Hz] to 20000 [Hz] (horizontal axis). 1 shows a noise value [dB (A)] (vertical axis) for each 1/3 OCT frequency band measured through a band-pass filter defined in the JIS standard of 1/3 OCT (octave). OA on the horizontal axis is a value (overall value) obtained by summing the noise values for each 1/3 OCT frequency band by the amount of energy. As shown in FIG. 5, the rotary compressor 1 according to the first embodiment can make the noise value smaller than that of a conventional rotary compressor at a 1/3 OCT frequency of 800 Hz to 2500 Hz, 5000 Hz to 20000 Hz, and an overall value.

  FIG. 6 is a bottom view showing the upper end plate cover of the second embodiment. As shown in FIG. 6, the upper end plate cover 170T2 of Example 2 is formed by pressing a steel plate into a circular shape in plan view, and has a recess 171T2 that is an outline of the upper muffler chamber 180T2. Five bolt holes 173T2 through which the through bolts 175 are passed are arranged in the flat plate portion 172T2 constituting the outer edge portion of the upper end plate cover 170T2. The upper end plate cover 170T2, the upper end plate 160T, and the second cylinder 121T are fastened by the five through bolts.

  The upper end plate cover 170T2 of Example 2 covers the second discharge valve portion 200TV of the upper end plate 160T and the upper end of the refrigerant passage hole 136 (see FIG. 4), and forms an upper muffler chamber 180T2 with the upper end plate 160T. The upper muffler chamber 180T2 connects the two projecting portions 181T2 that project radially from the center of the rotary shaft 15 between the bolts 175 (bolt holes 173T2) and the projecting bolts 175 (bolt holes 173T2). ) And five small diameter portions 182T2 formed on the center side of the rotary shaft 15 from the through bolts 175 so as not to interfere with each other. A muffler discharge hole 183T2 is provided in each of the two overhang portions 181T2. The muffler discharge hole 183T2 allows the upper muffler chamber 180T2 to communicate with the inside of the compressor housing 10.

  The second discharge hole 190T (see FIG. 4) constituting the second discharge valve portion 200TV, and the refrigerant passage hole 136 (see FIG. 4) communicating the lower muffler chamber (not shown) and the upper muffler chamber 180T2 It opens to the overhang portion 181T2 of the muffler chamber 180T2. The second discharge hole 190T and the refrigerant passage hole 136 are disposed at positions opposite to each other with respect to the rotation shaft 15. In order to reduce the pressure pulsation of the discharged refrigerant by causing the discharged refrigerant discharged from the first and second discharge holes 190S and 190T to spread in the upper muffler chamber 180T2, the total area of the two muffler discharge holes 183T2 is The total area of the first and second discharge holes 190S and 190T is not more than the total area.

  The rotary compressor according to the second embodiment includes a plurality of (two) projecting portions 181T2 in which the upper muffler chamber 180T2 projects radially between the bolts 175 (bolt holes 173T2) from the center of the rotating shaft 15, and each projecting portion. A plurality of (two) small-diameter portions 182T2 formed on the center side of the rotary shaft 15 from the through bolt 175 so as to connect between the 181T2 and not interfere with the through bolt 175 (bolt hole 173T2). The hole 183T2 is provided in each of a plurality (two) of the overhang portions 181T2, and the second discharge hole 190T of the second discharge valve portion 200TV of the upper end plate 160T that opens into the upper muffler chamber 180T2 and the refrigerant passage hole 136 The refrigerant discharged from the second discharge hole 190T is second in the overhanging portion 181T2 on the opposite side to the rotation shaft 15. The refrigerant discharged into the compressor housing 10 from the muffler discharge hole 183T2 disposed on the outlet hole 190T side and discharged from the refrigerant passage hole 136 is discharged from the muffler discharge hole 183T2 disposed on the refrigerant passage hole 136 side. It is discharged into the housing 10.

  Since the small-diameter portion 182T2 of the second embodiment has a longer circumferential length than the small-diameter portion 182T of the first embodiment, the refrigerant compressed by the second compression portion 12T in the upper muffler chamber 180T2, and the first The refrigerant compressed by the compression unit 12S and reduced in pressure pulsation by the lower muffler chamber and the refrigerant passage hole 136 and having a different pressure pulsation component are more unlikely to merge with the upper muffler chamber 180T of the first embodiment, and the pressure pulsation of the refrigerant is amplified. It is difficult, and the noise accompanying the discharge of the refrigerant can be suppressed more than the noise suppressing effect of the rotary compressor 1 of the first embodiment shown in FIG.

  Although the embodiments have been described above, the embodiments are not limited to the above-described contents. Further, the above-described components include substantially the same components, so-called equivalent ranges. Furthermore, the above-described components can be appropriately combined. Furthermore, at least one of various omissions, substitutions, and changes of the components can be made without departing from the scope of the embodiments.

DESCRIPTION OF SYMBOLS 1 Rotary compressor 10 Compressor housing | casing 11 Motor 12 Compression part 15 Rotating shaft 16 Oil supply pipe 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 ( Inhalation part)
105 Second suction pipe (suction part)
107 Discharge pipe (discharge section)
111 Stator 112 Rotor 12S 1st compression part (compression part)
12T 2nd compression part (compression part)
121S 1st cylinder (cylinder)
121T 2nd cylinder (cylinder)
122S 1st side overhang part 122T 2nd side overhang part 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 cylinder chamber (cylinder chamber)
130T Second cylinder chamber (cylinder chamber)
131S First suction chamber (suction chamber)
131T Second suction chamber (suction chamber)
133S 1st compression chamber (compression chamber)
133T Second compression chamber (compression chamber)
135S 1st suction hole (suction hole)
135T 2nd suction hole (suction hole)
136 Refrigerant passage hole 140 Intermediate partition plate 151 Secondary 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 part (bearing part)
161T Main bearing (bearing)
170S Lower end plate cover 170T, 170T2 Upper end plate cover 171T, 171T2 Recessed portion 172T, 172T2 Flat plate portion 173T, 173T2 Bolt hole 175 Through bolt 180S Lower muffler chamber (muffler chamber)
180T, 180T2 Upper muffler room (muffler room)
181T, 181T2 Overhang portion 182T, 182T2 Small diameter portion 183T, 183T2 Muffler discharge hole 190S First discharge hole 190T Second discharge hole 200S First discharge valve 200SV First discharge valve portion (discharge valve portion)
200T 2nd discharge valve 200TV 2nd discharge valve part (discharge valve part)
201S 1st discharge valve holder 201T 2nd discharge valve holder 252 Accum holder 253 Accum band 255 System connection pipe 257 Bottom through hole

Claims (2)

A vertically-placed cylindrical compressor casing that is provided with a refrigerant discharge section at the top and a refrigerant suction section at the bottom and sealed, and a refrigerant that is disposed at the bottom of the compressor casing and is sucked from the suction section A compression unit that compresses and discharges from the discharge unit, and a motor that is disposed on an upper portion of the compressor housing and drives the compression unit,
The compression unit is
A first cylinder and a second cylinder, each of which is annular;
Each having a discharge valve portion including a bearing portion and a discharge hole, a lower end plate closing the end of the first cylinder, and an upper end plate closing the end of the second cylinder;
An intermediate partition plate disposed between the first cylinder and the second cylinder and partitioning between the two,
A rotating shaft supported by the bearing portion of the upper end plate and the bearing portion of the lower end plate and rotated by the motor;
A first eccentric part and a second eccentric part provided with a phase difference of 180 degrees from each other on the rotating shaft;
A first annular piston fitted into the first eccentric portion and revolving along a first cylinder inner wall of the first cylinder to form a first cylinder chamber between the first cylinder inner wall;
A second annular piston fitted into the second eccentric portion and revolving along a second cylinder inner wall of the second cylinder to form a second cylinder chamber between the second cylinder inner wall;
A first cylinder chamber is divided into a first suction chamber and a first compression chamber by projecting from a first vane groove provided in the first cylinder into the first cylinder chamber and coming into contact with the first annular piston. Vane,
The second cylinder chamber is divided into a second suction chamber and a second compression chamber by projecting from the second vane groove provided in the second cylinder into the second cylinder chamber and contacting the second annular piston. Vane,
A refrigerant passage hole penetrating the lower end plate and the upper end plate, the first cylinder and the second cylinder, and the intermediate partition plate;
An upper end plate cover having a muffler discharge hole communicating with the inside of the compressor housing and covering an upper end of the discharge valve portion of the upper end plate and the refrigerant passage hole and forming an upper muffler chamber with the upper end plate; ,
A lower end plate cover that covers a lower end of the discharge valve portion of the lower end plate and the refrigerant passage hole;
Four or more lower end plate covers, upper end plate covers, the lower end plate, upper end plate, the first cylinder, the second cylinder, and the intermediate partition plate are provided on the outer edge of the upper end plate cover in a substantially concentric manner. Bolt holes,
A through bolt inserted into the bolt hole from the lower end plate cover side and fastening the lower end plate cover, the lower end plate, the first cylinder, the intermediate partition plate, and the second cylinder;
A through bolt that is inserted into the bolt hole from the upper end plate cover side and fastens the upper end plate cover, the upper end plate, and the second cylinder;
A rotary compressor comprising:
The upper muffler chamber has a plurality of overhanging portions and a plurality of small diameter portions, and the overhanging portion is formed to protrude from the center of the rotation shaft to between the through bolts and is provided with the muffler discharge hole. The small-diameter portion is formed on the center side of the rotating shaft from the through bolt so as to connect the overhang portions and not interfere with the through bolt.   The total area of the muffler discharge holes provided in each of the plurality of overhang portions is equal to or less than the total area of the discharge holes of the discharge valve portions of the lower and upper end plates. Rotary compressor.

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