JP5826708B2 - Gas compressor - Google Patents

Description

  The present invention relates to a gas compressor, and more particularly, to an improvement in a discharge passage in a vane rotary type gas compressor.

  In the air conditioning system, a gas compressor for compressing a gas such as a refrigerant gas and circulating the gas in the air conditioning system (air conditioning system) is used.

  In this gas compressor, a compressor main body that is driven to rotate and compresses gas is housed in a housing, and a discharge chamber into which high-pressure gas is discharged from the compressor main body is disposed inside the housing and the compressor main body. The high-pressure gas is discharged from the discharge chamber to the outside of the housing.

  As an example of such a gas compressor, a so-called vane rotary type is known.

  In this vane rotary type gas compressor, a compressor main body is accommodated in a housing. The compressor main body includes a substantially cylindrical rotor that rotates integrally with a rotation shaft, A cylinder having a contour-shaped inner peripheral surface that surrounds from the outside, and a plurality of plate-like vanes that are accommodated in vane grooves formed in the rotor and that protrude outward from the peripheral surface of the rotor, Bearings for rotatably supporting the rotating shafts protruding from both end faces of the rotor are formed, respectively, and provided with side blocks that contact the both end faces of the rotor and the cylinder and block the both end faces, and the outer peripheral face of the rotor and the cylinder A cylinder chamber, which is a space in which gas is sucked, compressed, and discharged, is formed by the inner peripheral surface of each of these and the inner surfaces of both side blocks.

  The cylinder chamber is configured such that the protruding tip of each vane protruding from the circumferential surface of the rotor contacts the inner circumferential surface of the cylinder, so that the outer circumferential surface of the rotor, the inner circumferential surface of the cylinder, the inner surfaces of both side blocks, and the rotor Are divided into a plurality of compression chambers by the surfaces of two vanes that follow each other along the rotation direction.

  Then, the high-pressure gas compressed in the compression chamber is discharged to the outside of the compressor body through a discharge portion formed in the cylinder (Patent Document 1).

JP 54-28008 A

  By the way, in the compressor main body of the gas compressor described in the prior art document, each compression chamber performs gas suction, compression, and discharge from the discharge portion formed in the cylinder for only one cycle during one rotation of the rotor. Since the compression period is long, the pressure of the gas confined inside the compression chamber may reach a desired discharge pressure before the compression chamber reaches the discharge portion.

  In this case, the inside of the compression chamber is over-compressed and there is a risk of increasing power.

  The present invention has been made in view of the above circumstances, and can prevent over-compression inside the compression chamber and simplify the structure of the compressor body and the oil separator provided outside the compressor body. An object of the present invention is to provide a gas compressor.

  A gas compressor according to the present invention includes a compressor body formed so as to perform gas suction, compression, and discharge for only one cycle during one rotation of a rotor, and includes a main discharge unit (first discharge unit). In addition, by providing a secondary discharge portion (second discharge portion) before the first discharge portion, over-compression within the compression chamber is prevented, and the first discharge portion and the first discharge portion The two discharge parts are communicated with each other through the communication path, and the gas discharged from both discharge parts is discharged to the oil separator provided outside the compressor main body through separate paths. By discharging to the outside of the compressor main body through the discharge path, the structure of the compressor main body and the oil separator is simplified.

That is, the first gas-body compressor Ru engaged to the present invention includes a substantially cylindrical rotor around the axis rotation, the rotor, the inner circumferential surface of the contour shape surrounding the rotor from the outside of the outer circumferential surface A cylinder having a plurality of plate-like vanes provided so as to protrude outwardly from the rotor by receiving back pressure from a vane groove formed in the rotor, and both end faces of the rotor and the cylinder. A plurality of compression chambers that are partitioned by the rotor, the cylinder, the side blocks, and the vanes. A compressor body formed so as to perform gas suction, compression, and discharge through a first discharge portion formed in the cylinder for one rotation period, and discharge from the compressor body An oil separator that separates oil from the gas through the passage of gas is provided, and the cylinder has an internal portion of the compression chamber at a stage before the compression chamber faces the first discharge portion by rotation of the rotor. When the pressure of the gas reaches the discharge pressure, a second discharge portion is formed for discharging the gas inside the compression chamber, and a communication path is formed through the first discharge portion and the second discharge portion. The first separator and the second outlet are formed on the upstream side of the gas flow with respect to the oil separator, and the communication path is formed on the outer peripheral surface of the cylinder. that it is formed by notches or through-holes that connect you characterized.
A second gas compressor according to the present invention is a cylinder having a substantially cylindrical rotor that rotates about an axis, and a contour-shaped inner peripheral surface that surrounds the rotor from the outer peripheral surface of the rotor. And a plurality of plate-like vanes provided so as to protrude outwardly from the rotor by receiving back pressure from the vane grooves formed in the rotor, and in contact with both end faces of the rotor and the cylinder. A plurality of compression chambers that are partitioned by the rotor, the cylinder, the side blocks, and the vanes, and each compression chamber is rotated once by the rotor; The main body of the compressor formed so as to perform gas suction, compression, and discharge through the first discharge portion formed in the cylinder for only one cycle, and the air discharged from the main body of the compressor Is provided with an oil separator that separates oil from the gas, and the cylinder has a gas inside the compression chamber before the compression chamber faces the first discharge portion by rotation of the rotor. When the pressure reaches the discharge pressure, a second discharge part for discharging the gas inside the compression chamber is formed, and a communication path for allowing the first discharge part and the second discharge part to pass through is formed. The communication path is formed on the upstream side of the gas flow with respect to the oil separator, and the communication path is formed on the outer peripheral surface of the cylinder and connects the first discharge section and the second discharge section. It is formed by a notch or a through hole, and the communication path is formed by a groove formed in at least one of the two side blocks and connecting the first discharge portion and the second discharge portion. It is characterized by.

  According to the gas compressor of the present invention, it is possible to prevent over-compression inside the compression chamber and simplify the structure of the compressor main body and the oil separator provided outside the compressor main body.

It is a longitudinal section of a vane rotary compressor which is one embodiment of a gas compressor concerning the present invention. It is sectional drawing along the AA line of the compressor part of the vane rotary compressor shown in FIG. It is sectional drawing equivalent to FIG. 2 which shows the compressor of other embodiment.

  Hereinafter, specific embodiments of a gas compressor according to the present invention will be described in detail with reference to the drawings.

  A vane rotary compressor 100 (hereinafter simply referred to as a compressor 100), which is an embodiment of a gas compressor according to the present invention, is an air having an evaporator, a gas compressor, a condenser, and an expansion valve installed in an automobile or the like. Used as a gas compressor in harmony systems. This air conditioning system constitutes a refrigeration cycle by circulating a refrigerant gas G (gas).

  As shown in FIG. 1, the compressor 100 has a configuration in which a motor 90 and a compressor main body 60 are accommodated in a housing 10 mainly composed of a main body case 11 and a front cover 12.

  The main body case 11 has a substantially cylindrical shape, and is formed such that one end portion of the cylindrical shape is closed, and the other end portion is opened.

  The front cover 12 is formed in a lid shape so as to close the opening while being in contact with the opening-side end portion of the main body case 11. In this state, the front cover 12 is fastened to the main body case 11 by a fastening member. And a housing 10 having a space inside is formed.

  The front cover 12 is formed with a suction port 12 a through which the low-pressure refrigerant gas G is introduced from the evaporator of the air conditioning system into the housing 10 through the inside and the outside of the housing 10.

  On the other hand, the main body case 11 is formed with a discharge port 11a through which the high-pressure refrigerant gas G is discharged from the inside of the housing 10 to the condenser of the air conditioning system through the inside and the outside of the housing 10.

  The motor 90 provided inside the main body case 11 constitutes a multiphase brushless DC motor including a permanent magnet rotor 90a and an electromagnet stator 90b.

  The stator 90b is fitted and fixed to the inner peripheral surface of the main body case 11, and the rotating shaft 51 is fixed to the rotor 90a.

  The motor 90 excites the electromagnet of the stator 90b with the electric power supplied via the power connector 90c attached to the front cover 12, thereby rotating the rotor 90a and the rotating shaft 51 around the axis.

  A configuration including an inverter circuit 90d or the like may be employed between the power connector 90c and the stator 90b.

  Although the compressor 100 of the present embodiment is an electric one as described above, the gas compressor according to the present invention is not limited to an electric one, and may be a mechanical one. If the compressor 100 of the embodiment is mechanical, instead of providing the motor 90, the rotating shaft 51 protrudes from the front cover 12 to the outside, and the front end of the protruding rotating shaft 51 has a vehicle engine. What is necessary is just to set it as the structure provided with the pulley, the gearwheel, etc. which receive motive power transmission from these.

  The compressor main body 60 accommodated in the housing 10 together with the motor 90 is arranged side by side with the motor 90 along the direction in which the rotating shaft 51 extends, and is fixed to the main body case 11 by a fastening member 15 such as a bolt. Has been.

  The compressor main body 60 accommodated in the housing 10 includes a rotating shaft 51 that can be rotated around an axis C by a motor 90, a substantially columnar rotor 50 that rotates integrally with the rotating shaft 51, and the rotor 50. The cylinder 40 having a contour-shaped inner peripheral surface 41 that surrounds the outer peripheral surface 52 from the outside, and five sheets provided so as to protrude from the outer peripheral surface 52 of the rotor 50 toward the inner peripheral surface 41 of the cylinder 40. A plate-like vane 58 and two side blocks (front side block 20 and rear side block 30) that block both ends of the rotor 50 and the cylinder 40 are provided.

  Here, the rotating shaft 51 is rotatably supported by bearings 12 b formed on the front cover 12 and bearings 27 and 37 formed on the side blocks 20 and 30 of the compressor body 60, respectively.

  Further, the compressor main body 60 partitions the space inside the housing 10 into a left space and a right space sandwiching the compressor main body 60 in FIG.

  Of the two spaces partitioned inside the housing 10, the space on the left side with respect to the compressor body 60 is a low-pressure atmosphere suction chamber 13 into which low-pressure refrigerant gas G is introduced from the evaporator through the suction port 12a. The space on the right side of the compressor body 60 is a discharge chamber 14 having a high-pressure atmosphere in which high-pressure refrigerant gas G is discharged to the condenser through the discharge port 11a.

  The motor 90 is disposed in the suction chamber 13.

  As shown in FIG. 2, the compressor main body 60 has a substantially C-shaped single body surrounded by an inner peripheral surface 41 of the cylinder 40, an outer peripheral surface 52 of the rotor 50, and both side blocks 20 and 30. A cylinder chamber 42 is formed.

  Specifically, the inner peripheral surface 41 of the cylinder 40 and the outer peripheral surface 52 of the rotor 50 are close to each other in one range (angle 360 [degrees]) around the axis C of the rotating shaft 51. The contour shape of the inner peripheral surface 41 of the cylinder 40 is set, whereby the cylinder chamber 42 forms a single space.

  The proximity portion 48 formed as a portion where the inner peripheral surface 41 of the cylinder 40 and the outer peripheral surface 52 of the rotor 50 are closest to each other in the contour shape of the inner peripheral surface 41 of the cylinder 40 is the inner peripheral surface 41 of the cylinder 40. And the outer peripheral surface 52 of the rotor 50 from the remote part 49 formed as the farthest part, along the rotational direction W of the rotor 50 (clockwise direction in FIG. 2), the angle is 270 degrees or more (360). Less than [degree]) is formed at a distant position.

  The contour shape of the inner peripheral surface 41 of the cylinder 40 is such that the outer peripheral surface 52 of the rotor 50 and the inner peripheral surface 41 of the cylinder 40 extend from the remote portion 49 to the proximity portion 48 along the rotation direction 51 of the rotating shaft 51 and the rotor 50. The shape is set such that the distance between and gradually decreases.

  The vane 58 is accommodated in a vane groove 59 formed in the rotor 50, and protrudes outward from the outer peripheral surface 52 of the rotor 50 due to the back pressure caused by the refrigerating machine oil R and the refrigerant gas G supplied to the vane groove 59.

  The vane 58 partitions the single cylinder chamber 42 into a plurality of compression chambers 43, and one compression chamber 43 is formed by two vanes 58 that move back and forth along the rotation direction W of the rotating shaft 51 and the rotor 50. It is formed. Therefore, in the present embodiment in which five vanes 58 are installed around the rotation shaft 51 at equal angular intervals of 72 degrees, five to six compression chambers 43 are formed.

  In addition, in the compression chamber 43 in which the proximity portion 48 exists between the two vanes 58 and 58, the proximity portion 48 and the one vane 58 constitute one closed space, so that the two vanes 58 are provided. , 58, the compression chamber 43 in which the proximity portion 48 exists results in two compression chambers 43, 43, so that six compression chambers 43 are formed even for five vanes.

  The internal volume of the compression chamber 43 obtained by partitioning the cylinder chamber 42 by the vane 58 gradually decreases along the rotation direction W from the remote portion 49 to the proximity portion 48.

  A portion of the cylinder chamber 42 on the most upstream side in the rotation direction W (a portion on the downstream side of the proximity portion 48 along the rotation direction W) leads to the suction chamber 13 formed in the front side block 20. Suction hole 23 (In FIG. 2, the front side block 20 is located on the front side of the drawing with respect to the cross section, and therefore, the suction hole 23 formed in the front side block 20 is indicated by a two-dot chain imaginary line.) Is facing.

  On the other hand, a first discharge formed in the cylinder 40 is formed in a portion of the cylinder chamber 42 on the most downstream side in the rotation direction W of the rotor 50 (a portion on the upstream side with respect to the proximity portion 48 along the rotation direction W). A discharge hole 45b communicated with the discharge chamber 45a of the section 45 faces, and a discharge hole 46b communicated with the discharge chamber 46a of the second discharge section 46 formed in the cylinder 40 faces upstream.

  The contour shape of the inner peripheral surface 41 of the cylinder 40 is that the refrigerant gas G is sucked into the compression chamber 43 from the suction chamber 13 through the suction hole formed in the front side block 20, and the refrigerant gas G is compressed in the compression chamber 43. In addition, the discharge of the refrigerant gas G from the compression chamber 43 to the discharge chamber 45a through the discharge hole 45b is set to be performed only for one cycle during one rotation of the rotor 50.

  On the most upstream side in the rotation direction W of the rotor 50, the contour shape of the inner peripheral surface 41 is set so that the distance between the inner peripheral surface 41 of the cylinder 40 and the outer peripheral surface 52 of the rotor 50 increases rapidly from a small state. In the angular range including the remote portion 49, the volume of the compression chamber 43 increases with rotation in the rotation direction W, and the refrigerant gas G enters the compression chamber 43 through the suction hole 23 formed in the front side block 20. It is a stroke (inhalation stroke) to be inhaled.

  Next, the contour shape of the inner peripheral surface 41 is set so that the distance between the inner peripheral surface 41 of the cylinder 40 and the outer peripheral surface 52 of the rotor 50 gradually decreases toward the downstream in the rotation direction W. In the range, the volume of the compression chamber 43 decreases with the rotation of the rotor 50, and a stroke (compression stroke) in which the refrigerant gas G in the compression chamber 43 is compressed.

  Further, on the downstream side in the rotation direction W of the rotor 50, the interval between the inner peripheral surface 41 of the cylinder 40 and the outer peripheral surface 52 of the rotor 50 is further reduced, and the compression of the refrigerant gas G further proceeds. When the discharge pressure is reached, the refrigerant gas G becomes a stroke (discharge stroke) discharged to the discharge chambers 45a and 46a of the discharge portions 45 and 46 through discharge holes 45b and 46b described later.

  As the rotor 50 rotates, each compression chamber 43 repeats the suction stroke, the compression stroke, and the discharge stroke in this order, so that the low-pressure refrigerant gas G sucked from the suction chamber 13 becomes high pressure and the compressor It is discharged to a cyclone block 70 (oil separator) that is outside the main body 60.

  The discharge portions 45 and 46 include discharge chambers 45 a and 46 a that are spaces surrounded by the outer peripheral surface of the cylinder 40 and the main body case 11, and discharge holes 45 b and 46 b that pass through the discharge chambers 45 a and 46 a and the compression chamber 43. When the pressure of the refrigerant gas G in the compression chamber 43 is equal to or higher than the pressure (discharge pressure) in the discharge chambers 45a and 46a, the pressure is changed elastically so as to warp the discharge chambers 45a and 46a due to the differential pressure. , 46b, and when the pressure of the refrigerant gas G is less than the pressure (discharge pressure) in the discharge chambers 45a, 46a, the discharge valves 45c, 46c and the discharge valves 45c, 46c close the discharge holes 45b, 46b by the elastic force. Valve supports 45d and 46d are provided to prevent excessive warpage on the side of the chambers 45a and 46a.

  Of the two discharge portions 45 and 46, the discharge portion provided on the downstream side in the rotation direction W, that is, the first discharge portion 45 on the side close to the proximity portion 48 is the main discharge portion.

  The first discharge section 45, which is the main discharge section, faces the compression chamber 43 in which the internal pressure always reaches the discharge pressure, so the compression chamber 43 passes through the first discharge section 45. During the period, the refrigerant gas G compressed in the compression chamber 43 is continuously discharged.

  On the other hand, of the two discharge parts 45 and 46, the discharge part provided on the upstream side in the rotation direction W, that is, the second discharge part 46 on the side far from the proximity part 48 is a secondary discharge part.

  The second discharge section 46, which is a secondary discharge section, over-compresses (discharges in the compression chamber 43 when the discharge pressure reaches the level before the compression chamber 43 faces the discharge section 45 on the downstream side. In the case where the pressure in the compression chamber 43 reaches the discharge pressure during the period in which the compression chamber 43 is facing the discharge portion 46. Only when the refrigerant gas G inside the compression chamber 43 is discharged and the pressure inside the compression chamber 43 does not reach the discharge pressure, the refrigerant gas G inside the compression chamber 43 is not discharged.

  The discharge chamber 45a of the first discharge unit 45 faces the discharge path 38 formed so as to penetrate to the outer surface of the rear side block 30 (the surface facing the discharge chamber 14), and the discharge chamber 45a passes through the discharge path 38. To the cyclone block 70 attached to the outer surface of the rear side block 30.

  On the other hand, the discharge chamber 46 a of the second discharge unit 46 does not directly communicate with the cyclone block 70, and a notch formed in the outer peripheral surface of the cylinder 40 has a discharge chamber 45 a of the first discharge unit 45. The communication path 39 communicates with the cyclone block 70 via the discharge chamber 45 a and the discharge path 38.

  Therefore, the refrigerant gas G discharged to the discharge chamber 46a of the second discharge unit 46 is discharged to the cyclone block 70 through the communication path 39, the discharge chamber 45a, and the discharge path 38 in this order.

  The cyclone block 70 is provided downstream of the flow of the refrigerant gas G with respect to the compressor body 60, and separates the refrigeration oil R mixed with the refrigerant gas G discharged from the compressor body 60 from the refrigerant gas G. Is.

  Specifically, the refrigerant gas G discharged from the discharge hole 45 b of the first discharge unit 45 to the discharge chamber 45 a and discharged from the compressor body 60 through the discharge path 38 and the discharge hole of the second discharge unit 46. The refrigerant gas G discharged from the compressor 46b to the discharge chamber 46a and discharged from the compressor main body 60 through the communication passage 39, the discharge chamber 45a of the first discharge portion 45 and the discharge passage 38 is spirally swirled. The refrigerating machine oil R is centrifuged from the refrigerant gas G.

  The refrigerating machine oil R separated from the refrigerant gas G is accumulated at the bottom of the discharge chamber 14, and the high-pressure refrigerant gas G after the refrigerating machine oil R is separated is discharged into the discharge chamber 14 and then passes through the discharge port 11a. And discharged to the condenser.

  The refrigerating machine oil R stored at the bottom of the discharge chamber 14 is supplied with oil passages 34a formed in the rear side block 30 and salai grooves that are back pressure supply recesses formed in the rear side block 30 due to the high pressure atmosphere in the discharge chamber 14. 31, 32, and oil passages 34 a and 34 b formed in the rear side block 30, an oil passage 44 formed in the cylinder 40, an oil passage 24 formed in the front side block 20, and the front side block 20. It is supplied to the vane groove 59 through the Sarai grooves 21 and 22 which are recesses for supplying back pressure.

  That is, when the vane groove 59 penetrating to both end faces of the rotor 50 is connected to the Sarai grooves 21 and 31 or the Saray grooves 22 and 32 of the side blocks 20 and 30 by the rotation of the rotor 50, the connected salai grooves The refrigerating machine oil R is supplied to the vane groove 59 from the grooves 21, 31 or the Sarai grooves 22, 32, and the pressure of the supplied refrigerating machine oil R becomes a back pressure that causes the vane 58 to protrude outward.

  Here, the passage through which the refrigerating machine oil R passes between the oil passage 34 a of the rear side block 30 and the Sarai groove 31 is between the bearing 37 of the rear side block 30 and the outer peripheral surface of the rotary shaft 51 supported by the bearing 37. It is a very narrow gap.

  The refrigerating machine oil R reaches the salai groove 31 due to the effect of pressure loss while passing through this narrow gap, even though the oil passage 34a has the same high pressure as the high pressure atmosphere of the discharge chamber 14. When this occurs, the pressure is medium pressure, which is lower than the pressure inside the discharge chamber 14.

  Here, the intermediate pressure is a pressure that is higher than the low pressure that is the pressure of the refrigerant gas G in the suction chamber 13 and lower than the high pressure that is the pressure of the refrigerant gas G in the discharge chamber 14.

  Similarly, the passage through which the refrigerating machine oil R passes between the oil passage 24 of the front side block 20 and the Sarai groove 21 is the bearing 27 of the front side block 20 and the outer peripheral surface of the rotary shaft 51 supported by the bearing 27. It is a very narrow gap between.

  The refrigerating machine oil R reaches the salai groove 21 due to the effect of pressure loss while passing through this narrow gap, even though the oil passage 24 has the same high pressure as the high pressure atmosphere of the discharge chamber 14. When this occurs, the pressure is medium pressure, which is lower than the pressure inside the discharge chamber 14.

  Therefore, the back pressure that is supplied from the Sarai grooves 21 and 31 to the vane groove 59 and causes the vane 58 to protrude toward the inner peripheral surface 41 of the cylinder 40 is an intermediate pressure of the refrigerator oil R.

  On the other hand, since the Saray grooves 22 and 32 communicate with the oil passages 24 and 34 without pressure loss, the Saray grooves 22 and 32 have a high pressure refrigerating machine oil having a high pressure equivalent to the pressure inside the discharge chamber 14. Therefore, at the end of the compression stroke in which the vane groove 59 communicates with the saray grooves 22 and 32, high pressure back pressure is supplied to the vane 58 to prevent the vane 58 from chattering.

  The refrigerating machine oil R starts to ooze out from the gap between the vane 58 and the vane groove 59, the gap between the rotor 50 and the side blocks 20, 30, and the like, and is formed between the rotor 50 and the side blocks 20, 30. A lubricating portion and a cooling function are also exerted in a contact portion between them and a contact portion between the vane 58 and the cylinder 40 or both side blocks 20 and 30, and a part of the refrigerating machine oil R is used as a refrigerant in the compression chamber 43. In order to be mixed with the gas G, the refrigerating machine oil R is separated by the cyclone block 70.

  According to the compressor 100 of the present embodiment configured as described above, the first discharge unit 45 and the second discharge unit 46 are communicated by the communication path 39 on the upstream side of the cyclone block 70. The refrigerant gas G discharged from the second discharge portion 46 flows into the cyclone block 70 through a discharge passage 38 that is a passage through which the refrigerant gas G discharged from the first discharge portion 45 is discharged.

  Thereby, the refrigerant path G for discharging the refrigerant gas G discharged from the first discharge portion 45 to the outside of the compressor main body 60 and the refrigerant gas G discharged from the second discharge portion 46 are converted into the compressor main body. It is not necessary to form a discharge path for discharging outside the compressor 60 on the outer surface of the compressor body 60 and the cyclone block 70 separately, and the structure of the compressor body 60 and the cyclone block 70 is simplified. Can do.

  Note that the compressor 100 of the present embodiment causes the refrigerant gas G discharged to the second discharge portion 46 to be discharged to the first discharge portion 45, and the compressor main body 60 through the discharge path 38 facing the first discharge portion 45. On the contrary, a discharge passage that penetrates to the outer surface of the rear side block 30 is formed so as to face the discharge chamber 46a of the second discharge portion 46, while the above-described implementation is performed. In the embodiment, the discharge passage 38 formed so as to face the discharge chamber 45a of the first discharge portion 45 is deleted, and the refrigerant gas G discharged to the discharge chamber 45a of the first discharge portion 45 is replaced with the communication passage 39, You may make it discharge outside the compressor main body 60 through the discharge chamber 46a and the discharge path of the 2nd discharge part 46. FIG.

  In addition, since the compressor 100 according to the above-described embodiment includes the second discharge portion 46 on the upstream side of the first discharge portion 45, the discharge is performed at a stage before the compression chamber 43 faces the first discharge portion 45. Even when the pressure has been reached, when the compression chamber 43 faces the second discharge portion 46 on the upstream side of the first discharge portion 45, the refrigerant gas G inside the compression chamber 43 is Since the gas is discharged from the compression chamber 43 through the second discharge portion 46, over-compression (compression to a pressure exceeding the discharge pressure) in the compression chamber 43 can be prevented.

  In the compressor 100 of the present embodiment, the communication path 39 is a notch formed on the outer peripheral surface of the cylinder 40 and connecting the discharge chamber 45a of the first discharge unit 45 and the discharge chamber 46a of the second discharge unit 46. However, a through hole that connects the discharge chamber 45a of the first discharge portion 45 and the discharge chamber 46a of the second discharge portion 46 is formed in the cylinder 40, and this through hole is formed in the communication passage 39 shown in FIG. It may be an alternative.

  Further, as shown in FIG. 3, the discharge chamber 45a and the second discharge portion of the first discharge portion 45 are provided so as not to penetrate the rear side block 30 up to the outer surface of the rear side block 30 (the surface facing the discharge chamber 14). A groove 39 'that connects the discharge chamber 46a of 46 may be formed, and the groove 39' may be used in place of the communication path 39 shown in FIG.

  The compressor 100 of the embodiment described above has five vanes 58, but the gas compressor according to the present invention is not limited to this form, and the number of vanes is two, three, and four. 6 and the like can be appropriately selected, and the same operation and effect as the above-described embodiment and the compressor 100 can be obtained also by the gas compressor to which the selected number of vanes are applied.

20 Front side block 30 Rear side block 38 Discharge path 39 Communication path 40 Cylinder 43 Compression chamber 45 First discharge part 46 Second discharge part 45a, 46a Discharge chamber 50 Rotor 51 Rotating shaft 58 Vane 60 Compressor body 70 Cyclone block ( Oil separator)
100 Vane rotary compressor (gas compressor)
C axis (axis)
G Refrigerant gas (gas)
R Refrigerating machine oil (oil content)
W Rotation direction

Claims (2)

A substantially cylindrical rotor that rotates about an axis, a cylinder having an inner peripheral surface having a contour shape surrounding the rotor from outside the outer peripheral surface, and a back pressure from a vane groove formed in the rotor And a plurality of plate-like vanes provided so as to protrude outward from the rotor, and two side blocks that are in contact with both end faces of the rotor and the cylinder and cover both end faces, A plurality of compression chambers partitioned by the rotor, the cylinder, the both side blocks, and the vanes are formed inside, and each compression chamber is formed in the cylinder for sucking and compressing gas during one rotation of the rotor. A compressor body formed so as to perform discharge through the first discharge section for only one cycle, and gas discharged from the compressor body passes to separate oil from the gas. Comprising a separator,
In the cylinder, when the pressure of the gas inside the compression chamber reaches the discharge pressure before the compression chamber faces the first discharge portion due to the rotation of the rotor, the inside of the compression chamber A second discharge part for discharging gas is formed;
A communication path that allows the first discharge part and the second discharge part to pass through is formed on the upstream side of the gas flow with respect to the oil separator ,
The gas compressor according to claim 1, wherein the communication path is formed by a notch or a through-hole formed on an outer peripheral surface of the cylinder and connecting the first discharge unit and the second discharge unit . A substantially cylindrical rotor that rotates about an axis, a cylinder having an inner peripheral surface having a contour shape surrounding the rotor from outside the outer peripheral surface, and a back pressure from a vane groove formed in the rotor And a plurality of plate-like vanes provided so as to protrude outward from the rotor, and two side blocks that are in contact with both end faces of the rotor and the cylinder and cover both end faces, A plurality of compression chambers partitioned by the rotor, the cylinder, the both side blocks, and the vanes are formed inside, and each compression chamber is formed in the cylinder for sucking and compressing gas during one rotation of the rotor. A compressor body formed so as to perform discharge through the first discharge section for only one cycle, and gas discharged from the compressor body passes to separate oil from the gas. Comprising a separator,
In the cylinder, when the pressure of the gas inside the compression chamber reaches the discharge pressure before the compression chamber faces the first discharge portion due to the rotation of the rotor, the inside of the compression chamber A second discharge part for discharging gas is formed;
A communication path that allows the first discharge part and the second discharge part to pass through is formed on the upstream side of the gas flow with respect to the oil separator ,
The gas compressor, wherein the communication path is formed by a groove formed in at least one of the two side blocks and connecting the first discharge section and the second discharge section .