JP2006169978A - Multi-cylinder rotary compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce generation of a collision sound by a collision between a second vane and a second roller, when switching to a second operation mode from a first operation mode, in a multi-cylinder rotary compressor usable by switching the first operation mode of allowing first and second rotary compression elements to perform compression work and the second operation mode of allowing only the first rotary compression element to substantially perform the compression work. <P>SOLUTION: When switching to the second operation mode from the first operation mode, pressure in a back pressure chamber 72A of the second vane 52, is delivered to the low pressure chamber side in a second cylinder 40. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention switches between a first operation mode in which the first and second rotary compression elements perform compression work and a second operation mode in which only the first rotary compression element performs compression work. The present invention relates to a possible multi-cylinder rotary compressor.

  A conventional multi-cylinder rotary compressor, for example, a two-cylinder rotary compressor provided with first and second rotary compression elements, includes a first and a second driven element driven in a sealed container by a drive element and a rotary shaft of the drive element. The second rotary compression element is accommodated. The first and second rotary compression elements include first and second cylinders, and first and second rollers that are fitted to eccentric portions formed on the rotation shaft and rotate eccentrically in the cylinders, respectively. The first and second vanes are in contact with the first and second rollers and divide the inside of each cylinder into a low pressure chamber side and a high pressure chamber side, respectively. The first and second vanes are always urged by the spring members to the first and second rollers, respectively.

When the drive element is driven, low-pressure refrigerant gas is sucked into the low-pressure chamber side of each cylinder of the first and second rotary compression elements via the suction port, and compressed by the operation of each roller and each vane. The refrigerant gas becomes a high-temperature and high-pressure refrigerant gas, and is discharged from the high-pressure chamber side of each cylinder to the discharge muffler chamber through the discharge port, and then discharged to the outside through the sealed container (for example, Patent Documents). 1).
JP-A-5-99172

  In such a multi-cylinder rotary compressor, when both cylinders perform compression operation in a small capacity range such as light load or low speed rotation, the refrigerant gas corresponding to the excluded volume of both cylinders must be sucked in and compressed. Therefore, the driving element was operated at a reduced speed. However, when the rotational speed is too low, the efficiency of the driving element is lowered, and there is a problem that the leakage loss is increased and the operation efficiency is remarkably lowered.

  For this reason, a multi-cylinder rotary compressor that can switch between a one-cylinder operation and a two-cylinder operation according to the capacity has been developed in view of such a problem. That is, one of the spring members that urge the first and second vanes of the multi-cylinder rotary compressor to the first and second rollers, for example, the second vane The spring member biased to the roller is deleted, and the refrigerant pressure on the discharge side of both rotary compression elements is applied as the back pressure of the second vane during the two-cylinder operation. As a result, the second vane is urged toward the second roller to perform compression work.

  On the other hand, when switching from the two-cylinder operation to the one-cylinder operation, the refrigerant pressure on the suction side of both rotary compression elements is applied as the back pressure of the second vane. Since the refrigerant pressure on the suction side is low, the second vane cannot be urged toward the second roller. For this reason, substantially no compression work is performed in the second rotary compression element, and the compression work of the refrigerant is performed only in the first rotary compression element.

  As described above, since the amount of refrigerant gas to be compressed can be reduced by performing the one-cylinder operation in the small capacity region, the number of revolutions can be increased accordingly. As a result, the operating efficiency of the drive element can be improved and the leakage loss can be reduced.

  However, with such a configuration, when switching from 2-cylinder operation to 1-cylinder operation, the refrigerant pressure (high pressure) on the discharge side of the rotary compression element applied as the back pressure of the second vane during 2-cylinder operation is used. ) Remains in the back pressure chamber of the second vane, and it takes time until the back pressure chamber of the second vane is switched to a low pressure. For this reason, the second vane is not easily retracted from the second cylinder, and the second vane and the second roller collide with each other during that time, causing a problem that a collision sound is generated.

  The present invention has been made to solve the problems of the related art, and includes a first operation mode in which the first and second rotary compression elements perform compression work, and a first rotary compression substantially. In a multi-cylinder rotary compressor that can be used by switching the second operation mode in which only the element performs the compression work, the second vane and the second operation mode at the time of switching from the first operation mode to the second operation mode are used. An object of the present invention is to reduce the generation of a collision sound due to the collision with the two rollers.

  The multi-cylinder rotary compressor according to the first aspect of the present invention houses a drive element and first and second rotary compression elements driven by a rotary shaft of the drive element in a sealed container, and the first and second The first and second rollers, the first and second cylinders, the first and second rollers that are fitted in eccentric portions formed on the rotary shaft and eccentrically rotate in the cylinders, and the first and second rollers, respectively. The first and second vanes are configured to abut against the two rollers and divide each cylinder into a low pressure chamber side and a high pressure chamber side, respectively, and only the first vane is attached to the first roller by a spring member. By switching the pressure applied to the back pressure chamber of the second vane, the first operation mode in which both rotary compression elements perform compression work, and substantially only the first rotary compression element performs compression work. That can be used by switching to the second operation mode There, at the time of switching from the first operation mode to the second operation mode, in which discharging the pressure in the back pressure chamber of the second vane toward the low pressure chamber in the second cylinder.

  A multi-cylinder rotary compressor according to a second aspect of the present invention includes a communication passage that communicates the low-pressure chamber side in the second cylinder and the back pressure chamber of the second vane in the above-described invention. The roller communicates only within a predetermined rotation range.

  According to the multi-cylinder rotary compressor of the present invention, when switching from the first operation mode to the second operation mode, the pressure in the back pressure chamber of the second vane is discharged to the low pressure chamber side in the second cylinder. Therefore, for example, by providing a communication path that communicates only within a predetermined rotation range of the second roller as in claim 2, the pressure in the back pressure chamber of the second vane is reduced to the low pressure chamber side in the second cylinder. If the pressure is discharged, the pressure in the back pressure chamber of the second vane can be released to the low pressure chamber side in the second cylinder.

  As a result, the pressure in the back pressure chamber of the second vane can be quickly reduced, so that the second vane can be retracted from the second cylinder at an early stage. The occurrence of collision with the second roller can be reduced.

  Therefore, noise at the time of switching from the first operation mode to the second operation mode can be reduced, and the reliability of the multi-cylinder rotary compressor can be improved.

  Next, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a longitudinal side view of an internal high-pressure rotary compressor 10 having first and second rotary compression elements as an embodiment of the multi-cylinder rotary compressor of the present invention, and FIG. 2 is a diagram of the rotary compressor 10 of FIG. FIG. 3 is a longitudinal sectional side view (showing a cross section different from FIG. 1), and FIG. 3 is a plan cross sectional view of the second cylinder 40 of the second rotary compression element 34, respectively. In addition, the rotary compressor 10 of a present Example comprises a part of refrigerant circuit of the air conditioner as a refrigeration apparatus which air-conditions a room | chamber interior.

  In each figure, the rotary compressor 10 of the embodiment is an internal high-pressure type rotary compressor, and is used as a drive element disposed in the upper side of the internal space of the sealed container 12 in a vertical cylindrical sealed container 12 made of a steel plate. An electric element 14 and a rotary compression mechanism portion 18 which is disposed below the electric element 14 and is driven by the rotary shaft 16 of the electric element 14 and which includes the first and second rotary compression elements 32 and 34 are accommodated. Yes.

  The sealed container 12 has an oil reservoir at the bottom, a container body 12A that houses the electric element 14 and the rotary compression mechanism 18, and a generally bowl-shaped end cap (lid body) 12B that closes the upper opening of the container body 12A. A circular mounting hole 12D is formed on the upper surface of the end cap 12B, and a terminal (wiring is omitted) 20 for supplying power to the electric element 14 is mounted in the mounting hole 12D. ing.

  Further, a refrigerant discharge pipe 96 described later is attached to the end cap 12B, and one end of the refrigerant introduction pipe 96 communicates with the inside of the sealed container 12. A mounting base 110 is provided on the bottom of the sealed container 12.

  The electric element 14 includes a stator 22 that is welded and fixed in an annular shape along the inner peripheral surface of the upper space of the sealed container 12, and a rotor 24 that is inserted and installed inside the stator 22 with a slight gap. The rotor 24 is fixed to a rotary shaft 16 that extends in the vertical direction through the center.

  The stator 22 has a laminated body 26 in which donut-shaped electromagnetic steel plates are laminated, and a stator coil 28 wound around the teeth of the laminated body 26 by a direct winding (concentrated winding) method. Similarly to the stator 22, the rotor 24 is also formed of a laminated body 30 of electromagnetic steel plates.

  An intermediate partition plate 36 is sandwiched between the first rotary compression element 32 and the second rotary compression element 34. That is, the first rotary compression element 32 and the second rotary compression element 34 include an intermediate partition plate 36, first and second cylinders 38 and 40 disposed above and below the intermediate partition plate 36, and the first rotary compression element 32 and the second rotary compression element 34. The first and second cylinders 38 and 40 are fitted to upper and lower eccentric portions 42 and 44 provided on the rotary shaft 16 with a phase difference of 180 degrees, and the first and second cylinders 38 and 40 rotate eccentrically in the cylinders 38 and 40, respectively. The first and second rollers 46, 48 and the first and second rollers 46, 48 have their tip portions in contact with each other to partition the cylinders 38, 40 into a low pressure chamber side and a high pressure chamber side, respectively. The upper support member 54 and the lower member as the support members that also serve as bearings for the rotary shaft 16 by closing the upper opening surface of the vanes 50 and 52 and the lower opening surface of the second cylinder 40. The support member 56 is used.

  The first and second cylinders 38 and 40 are respectively connected to the inside of the first and second cylinders 38 and 40 via a suction port 161 (the suction port of the first rotary compression element 32 is not shown). Suction passages 58 and 60 which communicate with each other are provided, and refrigerant introduction pipes 92 and 94 which will be described later are connected to the suction passages 58 and 60, respectively.

  A discharge muffler chamber 62 is provided above the upper support member 54, and the refrigerant gas compressed by the first rotary compression element 32 is discharged into the discharge muffler chamber 62. The discharge silencing chamber 62 has a hole through which the upper support member 54 that also serves as a bearing of the rotary shaft 16 and the rotary shaft 16 passes in the center, and covers the electric element 14 side (upper side) of the upper support member 54. It is formed in a bowl-shaped cup member 63. The electric element 14 is provided above the cup member 63 at a predetermined interval from the cup member 63.

  The lower support member 56 is provided with a discharge silencing chamber 64 formed by closing a recessed portion formed on the lower side of the lower support member 56 with a cover as a wall. That is, the discharge silencer chamber 64 is closed by the lower cover 68 that defines the discharge silencer chamber 64. The high pressure chamber sides of the cylinders 38 and 40 and the discharge silencer chambers 62 and 64 communicate with each other via a discharge port 49 (the discharge port of the first rotary compression element 32 is not shown).

  On the other hand, the first cylinder 38 is formed with a guide groove 70 for accommodating the first vane 50 described above. On the outside of the guide groove 70, that is, on the back side of the first vane 50, A storage portion 70A for storing a spring 74 as a spring member is formed. The spring 74 abuts against the rear side end of the first vane 50 and constantly urges the first vane 50 toward the first roller 46. Further, for example, a discharge side pressure (high pressure) described later in the sealed container 12 is also introduced into the storage portion 70 </ b> A and applied as a back pressure of the first vane 50. The storage portion 70A is open to the guide groove 70 side and the closed container 12 (container body 12A) side, and a metal plug 137 is provided on the closed container 12 side of the spring 74 stored in the storage portion 70A. Thus, it serves to prevent the spring 74 from coming off.

  The second cylinder 40 is formed with a guide groove 72 for accommodating the second vane 52, and a back pressure chamber is formed outside the guide groove 72, that is, on the back side of the second vane 52. 72A is formed. The back pressure chamber 72A is open to the guide groove 72 side and the closed container 12 side, and a pipe 75 described later is connected to the opening of the closed container 12 side to be sealed from the inside of the closed container 12.

  Sleeves 141 and 142 are welded and fixed to the side surfaces of the container body 12A of the sealed container 12 at positions corresponding to the suction passages 58 and 60 of the first cylinder 38 and the second cylinder 40, respectively. One end of a refrigerant introduction pipe 92 for introducing refrigerant gas into the first cylinder 38 is inserted and connected into the sleeve 141, and one end of the refrigerant introduction pipe 92 communicates with the suction passage 58 of the upper cylinder 38. The other end of the refrigerant introduction pipe 92 is opened in the accumulator 146.

  One end of a refrigerant introduction pipe 94 for introducing refrigerant gas into the second cylinder 40 is inserted into and connected to the sleeve 142, and one end of the refrigerant introduction pipe 94 communicates with the suction passage 60 of the second cylinder 40. The other end of the refrigerant introduction pipe 94 is opened in the accumulator 146 in the same manner as the refrigerant introduction pipe 92.

  The accumulator 146 is a tank that performs gas-liquid separation of the suction refrigerant, and is attached to the upper side surface of the container body 12 </ b> A of the sealed container 12 via a bracket 147. A refrigerant introduction pipe 92 and a refrigerant introduction pipe 94 are inserted into the accumulator 146 from the bottom, and openings at the other ends are positioned above the accumulator 146, respectively. Further, one end of the refrigerant pipe 100 is inserted into the upper part of the accumulator 146.

  The discharge silencer chamber 64 and the discharge silencer chamber 62 communicate with each other via a communication passage 120 that passes through the first and second cylinders 38 and 40 and the intermediate partition plate 36 in the axial direction (vertical direction). . Then, the high-temperature and high-pressure refrigerant gas compressed by the second rotary compression element 34 and discharged to the discharge muffler chamber 64 is discharged to the discharge muffler chamber 62 via the communication path 120, and Merges with compressed high-temperature and high-pressure refrigerant gas.

  Further, the discharge silencer chamber 62 and the inside of the sealed container 12 are communicated with each other through a hole (not shown) penetrating the cup member 63, and the first rotary compression element 32 and the second rotary compression element 34 are compressed through this hole. The high-temperature and high-pressure refrigerant gas discharged into the discharge silencer chamber 62 is discharged into the sealed container 12.

  On the other hand, a communication passage 130 is formed in the intermediate partition plate 36. Here, the communication path 130 will be described with reference to FIGS. 3 to 6 respectively show plan sectional views of the second cylinder 40 (showing the operation of the second vane 52 and the second roller 48 of the second rotary compression element 34). The communication passage 130 is a passage for communicating the low pressure chamber side in the second cylinder 40 and the back pressure chamber 72A of the second vane 52. The communication passage 130 is provided in the intermediate partition plate 36. A passage 131 that is formed in the axial direction (vertical direction) and communicates with the back pressure chamber 72A and the upper surface of the back pressure chamber 72A, and is formed in the middle partition plate 36 in the axial direction in the same manner as the passage 131. A passage 132 communicating with the low pressure chamber side in the second cylinder 40 and the upper surface of the second cylinder 40, and a passage 133 formed in the intermediate partition plate 36 in the horizontal direction and communicating with the passage 131 and the passage 132. It consists of and. The diameter of the passage 131 and the passage 133 in the embodiment is 1.5 mm, and the diameter of the passage 132 communicating with the low pressure chamber side in the second cylinder 40 is 0.7 mm smaller than the passages 131 and 132. Further, the passage 132 has a straight line connecting the tip of the second vane 52 contacting the second roller 48 and the center in the cylinder 40 to the low pressure chamber side (right side in FIGS. 3 to 8). And provided at a position that can be closed by the second vane 52.

  The opening 131 </ b> A of the communication path 131 is closed by the second vane 52 so as to be opened and closed. That is, when the second roller 48 is positioned at the top dead center as shown in FIG. 3 by the biasing operation of the second vane 52 to the second roller 48 in the front-rear direction, or near the top dead center. When positioned (in the present embodiment, when the second roller 48 is positioned within a range of 30 ° rotation from the top dead center), a part of the second vane 52 is positioned immediately below the opening 131A. Then, the opening 131A is closed by the second vane 52. In addition, when the second roller 48 is separated from the vicinity of the top dead center (in this embodiment, when the second roller 48 is rotated by 30 ° or more from the top dead center), the second vane 52 is separated from the opening 131A, so the opening 131A is opened.

  On the other hand, the opening 132 </ b> A of the passage 132 is closed by the second vane 52 or the second roller 48 so as to be opened and closed. That is, when the second roller 48 is located at the top dead center as shown in FIG. 3 or near the top dead center (in this embodiment, the second roller 48 is moved from the top dead center. In the case where the second roller 48 is partly located immediately below the opening 132A, the opening 132A is closed. Further, when the distance from the vicinity of the top dead center is reached (in this embodiment, when it is rotated by 70 ° or more from the top dead center), a part of the second vane 52 is located immediately below the opening 132A, so that the opening 132A is blocked. It becomes a state. The second roller 52 is only in a predetermined rotation range (in the present embodiment, the second roller 48 has a rotation angle in which the top dead center is 0 °, and is in a range of 60 ° or more and less than 70 ° in the rotation direction. Only) The opening 132A and the opening 131A are opened, and the communication path 130 is communicated.

  In the present embodiment, when the second roller 48 rotates 30 ° in the rotational direction from the top dead center, the opening 131 </ b> A is opened by the second vane 52. When the second roller 48 rotates 60 ° from the top dead center in the rotational direction (FIG. 4), the opening 132A is opened by the second roller 48. Accordingly, when the second roller 48 is rotated 60 ° from the top dead center, the openings 131A and 132A are opened as shown in FIG. 7 shows that the opening 131A of the passage 131 and the opening 132A of the passage 131, the second roller 48 and the second roller 48 formed in the intermediate partition plate 36 when the second roller 48 is rotated by 60 ° from the top dead center. It is a figure which shows the positional relationship of the vane 52. FIG.

  Then, as shown in FIGS. 5 and 8, when the second roller 48 rotates 70 ° from the top dead center, the opening 132A of the passage 132 is closed by the second vane 52, and the communication passage 130 is Blocked. 8 shows the opening 131A of the passage 131 and the opening 132A of the passage 131, the second roller 48, the second roller 48, and the second roller 48 formed in the intermediate partition plate 36 when the second roller 48 is rotated by 70 ° from the top dead center. It is a figure which shows the positional relationship of the vane 52. FIG.

  On the other hand, a refrigerant pipe 101 is connected to the middle of the refrigerant pipe 100, and the pipe is connected to the pipe 75 described above via an electromagnetic valve 105. Further, a refrigerant pipe 102 is also connected to the middle portion of the refrigerant discharge pipe 96 described above, and is connected to the pipe 75 via an electromagnetic valve 106 in the same manner as the refrigerant pipe 101. The opening and closing of the solenoid valves 105 and 106 are controlled by a controller 210 described later. That is, when the solenoid valve 105 is opened by the controller 210 and the solenoid valve 106 is closed, the refrigerant pipe 101 and the pipe 75 are communicated. As a result, a part of the suction side refrigerant of the rotary compression elements 32, 34 (or the first rotary compression element 32) flowing through the refrigerant pipe 100 and flowing into the accumulator 146 enters the refrigerant pipe 101 and back from the pipe 75. It flows into the pressure chamber 72A. As a result, the suction side pressure of the rotary compression elements 32 and 34 (or the first rotary compression element 32) is applied as the back pressure of the second vane 52.

  Further, when the electromagnetic valve 105 is closed by the controller 210 and the electromagnetic valve 106 is opened, the refrigerant discharge pipe 96 and the pipe 75 are communicated. As a result, a part of the discharge-side refrigerant of the rotary compression elements 32 and 34 discharged from the sealed container 12 and passing through the refrigerant discharge pipe 96 flows from the pipe 75 into the back pressure chamber 72A via the refrigerant pipe 102. As a result, the discharge-side pressure of the rotary compression elements 32 and 34 is applied as the back pressure of the second vane 52.

  The controller 210 described above controls the rotational speed of the electric element 14 of the rotary compressor 10. Further, as described above, the opening and closing of the solenoid valve 105 of the refrigerant pipe 101 and the solenoid valve 106 of the refrigerant pipe 106 are also controlled.

  Next, FIG. 9 shows a refrigerant circuit diagram of the air conditioner configured using the rotary compressor 10. That is, the rotary compressor 10 of the embodiment constitutes a part of the refrigerant circuit of the air conditioner shown in FIG. The refrigerant discharge pipe 96 of the rotary compressor 10 is connected to the inlet of the outdoor heat exchanger 152. The controller 210, the rotary compressor 10, and the outdoor heat exchanger 152 are provided in an outdoor unit (not shown) of the air conditioner. A pipe connected to the outlet of the outdoor heat exchanger 152 is connected to an expansion valve 154 as decompression means, and a pipe exiting the expansion valve 154 is connected to an indoor heat exchanger 156. The expansion valve 154 and the indoor side heat exchanger 156 are provided in an indoor unit (not shown) of the air conditioner. The refrigerant pipe 100 of the rotary compressor 10 is connected to the outlet side of the indoor heat exchanger 157.

  Note that HFC or HC refrigerant is used as the refrigerant, and the existing oil such as mineral oil (mineral oil), alkylbenzene oil, ether oil, ester oil is used as the lubricating oil.

  Next, the operation of the rotary compressor 10 with the above configuration will be described.

(1) First operation mode (normal load or high load)
First, the first operation mode in which the rotary compression elements 32 and 34 perform compression work will be described. Based on the operation command input of the controller on the indoor unit (not shown) provided in the indoor unit described above, the controller 210 controls the rotation speed of the electric element 14 of the rotary compressor 10 and the room is in a normal load or high load state. If so, the controller 210 executes the first operation mode. In this first operation mode, the controller 210 closes the electromagnetic valve 105 of the refrigerant pipe 101 and opens the electromagnetic valve 106 of the refrigerant pipe 102. As a result, the refrigerant pipe 102 and the pipe 75 are communicated with each other, the refrigerant on the discharge side of the rotary compression elements 32, 34 flows into the back pressure chamber 72 </ b> A, and the double rotary compression elements 32, 34 serve as the back pressure of the second vane 52. The discharge side pressure is applied.

  When the stator coil 28 of the electric element 14 is energized through the terminal 20 and a wiring (not shown), the electric element 14 is activated and the rotor 24 rotates. By this rotation, the first and second rollers 46 and 48 are eccentrically rotated in the first and second cylinders 38 and 40 by being fitted to upper and lower eccentric portions 42 and 44 provided integrally with the rotary shaft 16.

  Thereby, the low-pressure refrigerant flows from the refrigerant pipe 100 of the rotary compressor 10 into the accumulator 146. Since the solenoid valve 105 of the refrigerant pipe 100 is closed as described above, all of the refrigerant passing through the refrigerant pipe 100 flows into the accumulator 146 without flowing into the pipe 75.

  The low-pressure refrigerant that has flowed into the accumulator 146 is gas-liquid separated there, and then only the refrigerant gas enters the refrigerant discharge pipes 92 and 94 opened in the accumulator 146. The low-pressure refrigerant gas entering the refrigerant introduction pipe 92 is sucked into the low-pressure chamber side of the first cylinder 38 of the first rotary compression element 32 through the suction passage 58 and a suction port (not shown).

  The refrigerant gas sucked into the low-pressure chamber side of the first cylinder 38 is compressed by the operation of the first roller 46 and the first vane 50 to become a high-temperature and high-pressure refrigerant gas, and the high-pressure chamber side of the first cylinder 38. Then, the liquid is discharged into the discharge silencer chamber 62 through a discharge port (not shown).

  On the other hand, the low-pressure refrigerant gas entering the refrigerant introduction pipe 94 is sucked into the low-pressure chamber side of the second cylinder 40 of the second rotary compression element 34 through the suction passage 60 and the suction port 161. The refrigerant gas sucked into the low pressure chamber side of the second cylinder 40 is compressed by the operations of the second roller 48 and the second vane 52.

  At this time, since the discharge side pressure of the rotary compression elements 32 and 34 is applied to the second vane 52 as the back pressure as described above, the second vane 52 sufficiently follows the second roller 48. Can be made.

  Here, the compression operation in the second cylinder 40 of the second rotary compression element 34 will be described with reference to FIGS. 3 to 8. First, as shown in FIG. 3, the second roller 48 rotates from the top dead center (the second roller 48 rotates right in FIGS. 3 to 6) and passes through the suction port 161. The suction of the low-pressure refrigerant into the low-pressure chamber side ends. When the second roller 48 rotates 30 ° from the top dead center, the opening 131A of the passage 131 that has been blocked by the second vane 52 as described above is opened. At this time, since the opening 132A of the passage 132 communicating with the low-pressure chamber side in the second cylinder 40 is closed by the second roller 48, the communication passage 130 is not yet communicated.

  4 and 7, when the second roller 48 is rotated by 60 ° from the top dead center, the opening 132A of the passage 132 blocked by the second roller 48 is opened, and the communication passage 130 is opened. Is communicated. Thereby, the high-pressure refrigerant gas in the back pressure chamber 72 </ b> A is discharged to the low pressure chamber side in the second cylinder 40 through the communication path 130.

  When the second roller 48 rotates 70 ° from the top dead center as shown in FIGS. 5 and 8, the opening 132A of the passage 132 is closed by the second vane 52, so the communication passage 130 is closed, and the second The high pressure discharge into the cylinder 40 is stopped. As shown in FIG. 6, when the second roller 48 is rotated 90 ° from the top dead center, the opening of the passage 132A is blocked by the second vane 52 as described above, so the communication passage 130 is closed. The discharge of the high pressure gas into the second cylinder 40 is stopped.

  When the refrigerant is compressed by the operation of the second roller 48 and the second vane 52 and exceeds the bottom dead center (rotated 180 ° from the top dead center), the pressure on the high pressure chamber side in the cylinder 40 is a predetermined pressure. And discharged from the discharge port 49.

  Thereafter, when the second roller 48 rotates 330 ° from the top dead center, the opening 131A of the passage 131 in the back pressure chamber 72A is closed by the second vane 52. The discharge of the high-pressure refrigerant gas in the cylinder 40 is performed until the second roller 48 passes through the discharge port 49, and when the second roller 48 passes through the discharge port 49, the discharge of the refrigerant gas ends. .

  On the other hand, the refrigerant gas discharged from the high-pressure chamber side of the second cylinder 40 through the discharge port 49 to the discharge muffler chamber 64 is discharged to the discharge muffler chamber 62 via the communication path 120, It merges with the refrigerant compressed by the rotary compression element 32. The merged refrigerant is discharged into the sealed container 12 through a hole (not shown) that penetrates the cup member 63.

  Thereafter, the refrigerant in the sealed container 12 is discharged to the outside from a refrigerant discharge pipe 96 formed in the end cap 12B of the sealed container 12, and flows into the outdoor heat exchanger 152. Here, since the solenoid valve 106 of the pipe 102 is opened as described above, a part of the discharge side refrigerant of the rotary compression elements 32 and 24 passing through the refrigerant discharge pipe 96 enters the pipe 75 from the refrigerant pipe 102. The back pressure of the second vane 52 is applied.

  On the other hand, the refrigerant gas that has flowed into the outdoor heat exchanger 152 dissipates heat therein, is decompressed by the expansion valve 154, and then flows into the indoor heat exchanger 156. In the indoor heat exchanger 156, the refrigerant evaporates and absorbs heat from the air circulated in the room, thereby exerting a cooling action to cool the room. Then, the refrigerant repeats a cycle in which the refrigerant leaves the indoor heat exchanger 156 and is sucked into the rotary compressor 10.

(2) Switching from the first operation mode to the second operation mode (operation at light load) Next, when the room changes from the normal load or the high load state described above to the light load state, the controller 210 Transition from the operation mode to the second operation mode. The second operation mode is a mode in which only the first rotary compression element 32 substantially performs the compression work, and the electric element 14 is rotated at a low speed in the first operation mode due to a light load in the room. This is an operation mode performed when In the small capacity region of the rotary compressor 10, substantially only the first rotary compression element 32 performs the compression work, thereby compressing the refrigerant more than when the first and second cylinders 38 and 40 perform the compression work. Since the amount of gas can be reduced, the number of revolutions of the electric element 14 can be increased even at a light load, the operating efficiency of the electric element 14 can be improved, and the leakage loss of the refrigerant can also be reduced. Because it becomes.

  In this case, the controller 210 opens the electromagnetic valve 105 of the refrigerant pipe 101 and closes the electromagnetic valve 106 of the refrigerant pipe 102. Accordingly, the refrigerant pipe 101 and the pipe 75 are communicated, and the low-pressure refrigerant on the suction side of the first rotary compression element 32 flows into the back pressure chamber 72A.

  At this time, since the high-pressure refrigerant on the discharge side applied to the back pressure chamber 72A of the second vane 52 in the first operation mode remains in the back pressure chamber 72A, conventionally, the second vane 52 has It took time for the inside of the back pressure chamber 72A to switch to a low pressure. That is, the second vane 52 comes out into the second cylinder 40 by being pushed by the high pressure gas remaining in the back pressure chamber 72A. As a result, the second vane 52 and the second roller 48 collide with each other, causing a problem that a collision sound is generated.

  However, as in the present invention, the high pressure in the back pressure chamber 72A is increased by connecting the communication path 130 to a predetermined rotation range of the second roller 48 (in this embodiment, the rotation angle is 60 ° or more and less than 70 ° as described above). By discharging to the low pressure chamber side of the second cylinder 40, the high pressure in the back pressure chamber 72A can be released to the low pressure chamber side in the second cylinder 40.

  As a result, the pressure in the back pressure chamber 72A of the second vane 52 is quickly reduced, and a low pressure that is the pressure on the suction side of the first rotary compression element 32 is applied as the back pressure of the second vane 52. Will come to be. Therefore, the second vane 52 can be retracted from the second cylinder 40 at an early stage, and the occurrence of collision between the second vane 52 and the second roller 48 can be reduced. .

  In this embodiment, as described above, when the rotation direction is 60 °, the communication passage 130 is communicated, and the pressure in the back pressure chamber 72A is discharged to the low pressure chamber side in the second cylinder 40 and 10 ° from there. When rotating (when the second roller 48 rotates 70 ° from the top dead center in the rotation direction), the communication path 130 is closed, and pressure discharge to the low pressure chamber side in the second cylinder 40 is stopped. did. Here, in the case of such a structure, whenever the pressure of the back pressure chamber 72A of the second roller 48 is higher than that of the low pressure chamber in the second cylinder 40, the second roller 48 rotates 60 ° in the rotation direction. The pressure in the back pressure chamber 72 </ b> A is discharged into the second cylinder 40.

  That is, when the pressure discharge amount in the back pressure chamber 72A to the low pressure chamber side in the second cylinder 40 increases, the suction amount of the low pressure refrigerant to the low pressure chamber side in the second cylinder 40 in the first operation mode. Decreases, and the volumetric efficiency of the second rotary compression element 34 is significantly reduced. Therefore, by providing the opening 132A of the passage 132 at a position where the communication passage 130 is communicated only within a limited rotation range of the second roller 48 as in the present embodiment, the second rotary compression element 34 is provided. It is possible to suppress a decrease in volumetric efficiency and to reduce noise when switching from the first mode to the second operation mode.

  Further, since the noise can be reduced with a simple structure in which the communication path 130 is provided in the intermediate partition plate 36, an increase in manufacturing cost can be avoided as much as possible. As a result, noise at the time of switching from the first operation mode to the second operation mode can be reduced at low cost, and the reliability of the rotary compressor 10 can be improved.

(3) Second Operation Mode Next, the operation of the rotary compressor 10 in the second operation mode will be described. The low-pressure refrigerant flows into the accumulator 146 from the refrigerant pipe 100 of the rotary compressor 10. At this time, since the solenoid valve 105 of the refrigerant pipe 101 is opened as described above, a part of the refrigerant on the suction side of the first rotary compression element 32 passing through the refrigerant pipe 100 passes through the pipe 75 from the refrigerant pipe 101. Then, it flows into the back pressure chamber 72A. As a result, the back pressure chamber 72A becomes the suction side pressure of the first rotary compression element 32 as described above, and the suction side pressure of the first rotary compression element 32 is applied as the back pressure of the second vane 52. It will be.

  The low-pressure refrigerant that has flowed into the accumulator 146 is gas-liquid separated there, and then only the refrigerant gas enters the refrigerant discharge pipe 92 that opens into the accumulator 146. The low-pressure refrigerant gas entering the refrigerant introduction pipe 92 is sucked into the low-pressure chamber side of the first cylinder 38 of the first rotary compression element 32 through the suction passage 58 and a suction port (not shown).

  The refrigerant gas sucked into the low-pressure chamber side of the first cylinder 38 is compressed by the operation of the first roller 46 and the first vane 50 to become a high-temperature and high-pressure refrigerant gas, and the high-pressure chamber side of the first cylinder 38. Then, the liquid is discharged into the discharge silencer chamber 62 through a discharge port (not shown). The refrigerant gas discharged into the discharge silencer chamber 62 is discharged into the sealed container 12 through a hole (not shown) that penetrates the cup member 63.

  Thereafter, the refrigerant in the sealed container 12 is discharged to the outside from a refrigerant discharge pipe 96 formed in the end cap 12B of the sealed container 12, and flows into the outdoor heat exchanger 152. The refrigerant gas that has flowed into the outdoor heat exchanger 152 radiates heat therein, is decompressed by the expansion valve 154, and then flows into the indoor heat exchanger 156. In the indoor heat exchanger 156, the refrigerant evaporates and absorbs heat from the air circulated in the room, thereby exerting a cooling action to cool the room. Then, the refrigerant repeats a cycle in which the refrigerant leaves the indoor heat exchanger 156 and is sucked into the rotary compressor 10.

  In this embodiment, when the second roller 48 rotates 60 ° from the top dead center in the rotational direction, the communication passage 130 is communicated, and the pressure in the back pressure chamber 72A is transferred to the low pressure chamber side in the second cylinder 40. When discharged and rotated 10 ° therefrom (when the second roller 48 is rotated 70 ° from the top dead center in the rotational direction), the communication passage 130 is closed, and the low pressure chamber side in the second cylinder 40 is closed. Although the pressure discharge is stopped, the second roller 48 is only in a predetermined rotation range, for example, during any period during which the second roller 48 rotates 20 ° to 120 ° from the top dead center. The communication path 130 is connected, the pressure in the back pressure chamber 72A is discharged to the low pressure chamber side in the second cylinder 40, and then the pressure discharge to the low pressure chamber side in the second cylinder 40 is stopped. If so, the position of the communication path 130 is not limited to this embodiment. Yes.

  The communication passage 130 is provided with an opening / closing valve for opening / closing the communication passage, and the opening / closing valve is opened only when the opening / closing valve is controlled to switch from the first operation mode to the second operation mode. It does not matter even if it communicates. In this case, since the pressure in the back pressure chamber 72A is not discharged to the low pressure chamber side of the second cylinder 40 in the first operation mode, avoiding a decrease in volumetric efficiency of the second rotary compression element 34. Will be able to.

  Furthermore, in this embodiment, in the first operation mode, as the back pressure of the second vane 52, a high pressure that is the refrigerant pressure on the discharge side of the rotary compression elements 32 and 34 is applied. A pressure (intermediate pressure) between the discharge-side refrigerant pressure and the suction-side refrigerant pressure may be applied as the back pressure of the second vane 52. In this case, for example, a valve device is provided in the middle of the pipe 75 and the valve device is closed to prevent the refrigerant from flowing into the back pressure chamber 72A. As a result, the refrigerant flows only slightly into the back pressure chamber 72A from both the high pressure chamber side and the low pressure chamber side in the second cylinder 40 from the gap of the second vane 52, and the back pressure chamber 72A It becomes an intermediate pressure between the suction side pressure and the discharge side pressure of the rotary compression elements 32 and 34.

  Thus, even when the valve device is provided in the pipe 75 and the valve device is closed to prevent the flow of high-pressure refrigerant from the pipe 75 into the back pressure chamber 72A, the inside of the back pressure chamber 72A has an intermediate pressure. The second vane 52 can be sufficiently urged against the second roller 48 without using a spring member. Further, at the time of switching from the first operation mode to the second operation mode, the second vane 52 can be retracted from the second cylinder 40 at an early stage according to the present invention. And the occurrence of a collision between the second roller 48 and the second roller 48 can be reduced.

  In the above embodiment, the rotary compressor 16 has been described as being a vertical type, but it goes without saying that the present invention is also applicable to a rotary compressor having a rotary shaft as a horizontal type. Further, the present invention can be applied to a multi-cylinder rotary compressor having a rotary compression element having three or more cylinders.

It is a vertical side view of the multi-cylinder rotary compressor of the present invention. FIG. 3 is another longitudinal side view of the multi-cylinder rotary compressor of FIG. 1. It is a plane sectional view of the 2nd cylinder when the 2nd roller of the 2nd rotary compression element of the multi-cylinder rotary compressor of Drawing 1 is located in a top dead center. FIG. 3 is a plan sectional view of a second cylinder when a second roller of a second rotary compression element of the multi-cylinder rotary compressor of FIG. 1 rotates 60 ° from the top dead center in the rotational direction. FIG. 3 is a plan sectional view of a second cylinder when a second roller of a second rotary compression element of the multi-cylinder rotary compressor of FIG. 1 is rotated by 70 ° in the rotation direction from the top dead center. FIG. 3 is a plan sectional view of a second cylinder when a second roller of a second rotary compression element of the multi-cylinder rotary compressor of FIG. 1 is rotated 90 ° from the top dead center in the rotational direction. It is a figure which shows the positional relationship of the opening of each channel | path when a 2nd roller rotates 60 degrees from a top dead center, a 2nd roller, and a 2nd vane. It is a figure which shows the positional relationship of the opening of each channel | path when a 2nd roller rotates 70 degrees from a top dead center, a 2nd roller, and a 2nd vane. It is a refrigerant circuit diagram of the air conditioner using the multi-cylinder rotary compressor of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Rotary compressor 12 Airtight container 14 Electric element 16 Rotating shaft 18 Rotation compression mechanism part 20 Terminal 22 Stator 24 Rotor 26 Laminated body 28 Stator coil 30 Laminated body 32 1st rotation compression element 34 2nd rotation compression element 36 Intermediate partition plate 38 First cylinder 40 Second cylinder 42, 44 Eccentric portion 46 First roller 48 Second roller 49 Discharge port 50 First vane 52 Second vane 54 Upper support member 56 Lower support member 58, 60 Suction Passage 62, 64 Discharge muffler chamber 63 Cup member 68 Lower cover 70, 72 Guide groove 70A Storage portion 72A Back pressure chamber 74 Spring 75 Pipe 92, 94 Refrigerant introduction pipe 96 Refrigerant discharge pipe 100, 101, 102 Refrigerant pipe 130 Communication path 131 , 132, 133 passage 131A, 132 A Opening 152 Outdoor heat exchanger 154 Expansion valve 156 Indoor heat exchanger 210 Controller

Claims (2)

A drive element and first and second rotary compression elements driven by a rotation shaft of the drive element are housed in a sealed container, and the first and second rotary compression elements are arranged as first and second cylinders. A first roller and a second roller which are fitted into an eccentric portion formed on the rotating shaft and rotate eccentrically in the cylinders, and abutting the first and second rollers, and in the cylinders Is composed of first and second vanes that are divided into a low-pressure chamber side and a high-pressure chamber side, respectively, and only the first vane is urged to the first roller by a spring member, and the second vane By switching the pressure applied to the back pressure chamber, the first operation mode in which the rotary compression elements perform compression work and the second operation in which only the first rotary compression element substantially performs compression work are performed. Multi-cylinder rotary compression that can be used by switching modes In,
When switching from the first operation mode to the second operation mode, the multi-cylinder rotation is characterized in that the pressure in the back pressure chamber of the second vane is discharged to the low pressure chamber side in the second cylinder. Compressor. A communication path communicating the low pressure chamber side in the second cylinder and the back pressure chamber of the second vane;
The multi-cylinder rotary compressor according to claim 1, wherein the communication path is communicated only within a predetermined rotation range of the second roller.

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