JP2006083844A - Multi-cylinder rotary compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the suction loss of each compression chamber and reduce suction noises without enlarging the cross section area of a suction port of each compression chamber. <P>SOLUTION: The multi-cylinder rotary compressor comprises first and second compression chambers 31, 32 partitioned from each other, first and second suction ports 61, 62 communicated with the insides of the first and second compression chambers, respectively, and a communication hole 71 located adjacent to the first and second suction ports 61, 62 for communicating the first compression chamber 31 with the second compression chamber 32. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a multi-cylinder rotary compressor, and more particularly to a multi-cylinder rotary compressor that can reduce suction loss and noise generated by refrigerant suction.

  In general, a rotary compressor having a single compression chamber rotates with the ring piston in the compression chamber being eccentric with respect to the center of the rotation shaft. There was a problem that the vibration increased due to the equilibrium. Therefore, in order to solve such problems, independent compression chambers are provided in the upper and lower portions, and the ring pistons in the respective compression chambers are rotated at opposite positions, thereby minimizing rotational torque changes and mass imbalances. What has become a multi-cylinder rotary compressor.

  Patent Document 1 (published on June 5, 2001) discloses such a multi-cylinder rotary compressor. The compressor includes an upper first cylinder body in which a first compression chamber is formed, a lower second cylinder body in which a second compression chamber is formed, a first compression chamber, and a second compression chamber. And a partition plate for partitioning between the two. The compressor also includes first and second ring pistons that compress the refrigerant gas while rotating eccentrically while maintaining the opposite positions inside the compression chambers when the rotary shaft rotates, and refrigerant gas in each compression chamber. In order to inhale the air, it further includes first and second suction ports communicating with each compression chamber.

However, the multi-cylinder rotary compressor as described above has a lower height of the first and second cylinder bodies forming the compression chambers than the same capacity rotary compressor having one compression chamber. The diameters of the first and second suction ports formed in the cylinder body were also limited. Therefore, since this compressor has a large suction flow resistance due to a small cross-sectional area of each suction port, each suction at the time when the suction volume of each compression chamber suddenly increases (when the amount of gas suction increases rapidly). There is a problem that the amount of gas flowing through the mouth is not sufficient, and suction loss and suction noise increase.
Japanese Unexamined Patent Publication No. 2001-153079

  The present invention has been made to solve the above-described problems, and provides a multi-cylinder rotary compressor that can reduce the suction loss of each compression chamber without increasing the cross-sectional area of the suction port of each compression chamber. The purpose is to provide.

  Another object of the present invention is to provide a multi-cylinder rotary compressor that can reduce suction noise.

  In order to achieve the above object, a multi-cylinder rotary compressor according to the present invention includes first and second compression chambers that are partitioned from each other, and first and second chambers that communicate with the interiors of the first and second compression chambers, respectively. It includes a second suction port and a communication hole that is positioned adjacent to the first and second suction ports and communicates with the first compression chamber and the second compression chamber.

  The first and second cavities may be further formed by being recessed to a predetermined depth on the inner surfaces of the first and second compression chambers at positions adjacent to the communication holes.

  Further, the first and second cavities are positioned to face the communication hole.

  Also, first and second cylinder bodies for forming the first and second compression chambers, first and second compression devices installed in the first and second compression chambers, and the first And a rotary shaft installed through the first and second compression chambers to drive the second compression device, a partition plate interposed between the first and second cylinder bodies, and the partition plate And first and second shaft support members that support the rotating shaft while closing the openings of the first and second compression chambers, respectively.

  The communication hole is formed in the partition plate.

  The first and second cavities are formed on the inner surfaces of the first and second shaft support members at positions facing the communication holes.

  The first and second compression devices include first and second eccentric portions that are eccentric in opposite directions with respect to the rotation shafts in the first and second compression chambers, and the first and second compression chambers, respectively. The first and second ring pistons coupled to the outer surfaces of the first and second eccentric parts, respectively, and the first and second ring pistons while performing linear motion in a radial direction by rotation of the first and second ring pistons. The first and second vanes that define the internal space of the two compression chambers are included.

  The maximum width of the communication hole and the first and second cavities is smaller than the radial thickness of the ring piston.

  The multi-cylinder rotary compressor according to the present invention includes a first and a second compression chamber that are partitioned from each other, and a first and a second that perform a compression operation while being eccentric in opposite directions in the first and second compression chambers. Two compressors, first and second suction ports communicating with the first and second compression chambers, respectively, and adjacent to the first and second suction ports, the first and second suction ports And a communication hole communicating with the compression chamber.

  In the multi-cylinder rotary compressor according to the present invention, the gas sucked into each compression chamber through each suction port is shared through the communication hole even when the size of the suction port of each compression chamber is limited. Even when the required suction amount of the chamber becomes maximum, it is possible to prevent a suction loss by sufficiently securing the amount of gas sucked into each compression chamber.

  Further, the present invention has an effect of minimizing the generation of suction noise due to the suction flow resistance of each suction port because the gas suction into each compression chamber is smooth.

  In addition, the present invention has the effect of further reducing suction noise, since the first and second cavities provided on the inner surface of each compression chamber at positions adjacent to each suction port serve as Helmholtz resonators. .

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

  As shown in FIG. 1, the multi-cylinder rotary compressor according to the present invention is installed at an electric mechanism portion 20 installed at the upper part inside the sealed container 10 in order to generate a rotational force, and at an inner lower part of the sealed container 10, And a compression mechanism unit 30 connected to the electric mechanism unit 20 through the rotation shaft 21.

  The electric mechanism unit 20 is a cylindrical stator 22 fixed to the inner surface of the hermetic container 10, and a rotor 23 that is rotatably installed inside the stator 22 and has a central portion coupled to the rotating shaft 21. Including.

  As shown in FIGS. 1 to 3, the compression mechanism section 30 includes an upper first cylinder body 33 in which a cylindrical first compression chamber 31 is formed, and a cylindrical second compression chamber 32 disposed therein. A lower second cylinder body 34 formed, and first and second compression devices 40 and 50 installed in the first compression chamber 31 and the second compression chamber 32, respectively, for performing a gas compression operation. Prepare. The rotating shaft 21 extended from the electric mechanism unit 20 is installed in a form penetrating through the centers of the first and second compression chambers 31 and 32 in order to operate the compression devices 40 and 50 in the compression chambers 31 and 32. Is done.

  Further, the compression mechanism section 30 is a partition plate interposed between the first cylinder body 33 and the second cylinder body 34 in order to partition the upper first compression chamber 31 and the lower second compression chamber 32. 35, and an upper opening of the first compression chamber 31 and a lower opening of the second compression chamber 32, and an upper portion of the first cylinder body 33 and a lower portion of the second cylinder body 34 for supporting the rotating shaft 21. And first and second shaft support members 36 and 37, respectively.

  The first and second compression devices 40, 50 installed inside the first and second compression chambers 31, 32 are the first provided on the outer surface of the rotating shaft 21 of the first and second compression chambers 31, 32. The first and second eccentric parts 41 and 51 and the first and second eccentric parts 41 and 51 rotate such that the first and second eccentric parts 41 and 51 rotate in a state where the outer surfaces thereof are in contact with the inner surfaces of the compression chambers 31 and 32. , 51 are coupled to the outer surfaces of the first and second ring pistons 42, 52, respectively, and the first and second ring pistons 42, 52 are rotated in the radial direction of the first and second compression chambers 31, 32. The first and second vanes 43 and 53 that divide the internal space of the compression chambers 31 and 32 into a suction side and a discharge side while performing linear motion (see FIGS. 2 and 3). At this time, the 1st eccentric part 41 and the 2nd eccentric part 51 which are provided in the outer surface of the rotating shaft 21 are eccentric in the mutually opposite direction. Therefore, since the compression operation is performed in a state where both sides of the rotating shaft are kept in balance, it is possible to minimize the change in the rotational torque and reduce the generation of vibration.

  The first and second cylinder bodies 33 and 34 are formed with first and second suction ports 61 and 62 for allowing gas to flow into the first and second cylinder bodies 33 and 34, respectively. The second suction pipes 63 and 64 are connected to each other. Further, the upper first shaft support member 36 and the lower second shaft support member 37 are formed with a first discharge port 65 and a second discharge port 66 for discharging pressurized gas (FIG. 2). And see FIG. In FIG. 1, the code | symbol 13 shows the accumulator installed in the suction piping 11, and 12 has each shown the discharge piping for guiding the compressed refrigerant in the airtight container 10 outside.

  The multi-cylinder rotary compressor is operated in the direction of arrow A while the first and second eccentric portions 41 and 51 in the first and second compression chambers 31 and 32 maintain opposite positions by the operation of the electric mechanism unit 20. When rotating, the first and second ring pistons 42 and 52 suck gas from the first and second suction ports 61 and 62 while rotating eccentrically in the compression chambers 31 and 32, and the first and second discharge ports 65. , 66 is compressed by discharging compressed gas.

  When the gas compression operation is performed as described above, each of the compression chambers 31 and 32 has the first eccentric portion 41 and the second eccentric portion 51 which are eccentric in opposite directions, so that one of the suction volumes However, such a phenomenon is repeated alternately with a phase difference of 180 degrees in the two compression chambers 31 and 32. That is, as shown in FIG. 2, when the suction volume of the first compression chamber 31 is increased, the suction volume of the second compression chamber 32 is decreased as shown in FIG. In this state, when the rotating shaft 21 further rotates 180 degrees in the direction of arrow A, the suction volume of the second compression chamber 32 increases and the suction volume of the first compression chamber 31 decreases. As described above, the suction volumes of the compression chambers 31 and 32 are maintained in the opposite states. Therefore, when the suction volume of one of the compression chambers increases and the required suction amount of the gas increases, The suction volume of the chamber is reduced, and the required amount of gas suction is reduced.

  Further, when the suction volume of each compression chamber 31, 32 increases rapidly, the required suction amount of gas through each suction port 61, 62 increases rapidly, but the size of each suction port 61, 62 is large. Due to the limitation, the amount of gas to be inhaled is insufficient and inhalation loss occurs. In order to solve such a problem, as shown in FIGS. 4 and 5, the present invention is provided with a communication hole 71 in the partition plate 35 adjacent to the two suction ports 61 and 62, and this communication hole 71. Thus, the first and second compression chambers 31 and 32 are communicated with each other.

  As a result, when the suction volume of the compression chamber on either side increases and the required amount of gas suction increases, the gas in the compression chamber on the other side with a relatively small suction volume and a low required gas suction amount becomes Since it is supplied to the compression chamber side through which the suction required amount (or suction volume) is large through the communication hole 71, suction loss can be prevented. That is, even when the suction ports 61 and 62 of the compression chambers 31 and 32 are limited in size, the gas sucked into the compression chambers 31 and 32 through the suction ports 61 and 62 is shared through the communication hole 71. Therefore, even when the required suction amount of each compression chamber 31, 32 is maximized, the suction loss can be prevented by sufficiently securing the amount of gas sucked into each compression chamber 31, 32.

  For example, when the suction volume of the first compression chamber 31 is increased and the gas suction request amount is rapidly increased, not only the gas sucked into the first compression chamber 31 through the first suction port 61 but also the second Part of the gas that flows into the second compression chamber 32 through the suction port 62 flows into the suction side of the first compression chamber 31 through the communication hole 71, so that suction loss of the first compression chamber 31 is prevented. . On the other hand, when the suction volume of the second compression chamber 32 is increased, a part of the gas sucked through the first suction port 61 flows into the second compression chamber 32 through the communication hole 71. 32 inhalation losses are prevented.

  Here, as shown in FIGS. 4 and 5, the communication hole 71 is formed in the partition plate 35 in the first and second compression chambers 31, 32 adjacent to the two suction ports 61, 62, and two compressions are made. The chambers 31 and 32 are connected. 7, the communication hole 72 is formed not only on the partition plate 35 but also on the inner wall side of the compression chambers 31 and 32 of the two cylinder bodies 33 and 34. , 62 are communicated with each other, and the same effect as the present embodiment can be exhibited. However, according to the configuration of FIG. 7, the communication holes 72 should be processed not only in the partition plate 35 but also in the two cylinder bodies 33 and 34 in order to communicate the outlet sides of the two suction ports 61 and 62. Thus, the manufacturing process becomes complicated. Therefore, as shown in FIG. 4, the communication hole 71 is preferably formed in the partition plate 35 so that the insides of the two compression chambers 31 and 32 are directly communicated by the partition plate 35.

  Further, as shown in FIG. 4, the communication hole 71 should have a maximum width smaller than the radial thickness of the first and second ring pistons 42 and 52. If the width of the communication hole 71 is larger than the thickness of the two ring pistons 42, 52, the compressed gas flows from the compression chambers 31, 32 to the respective rings when the ring pistons 42, 52 are positioned in the communication holes 71. Since it flows through the communication hole 71 into the internal space of the pistons 42 and 52, the compression efficiency is lowered.

  Further, the multi-cylinder rotary compressor according to the present invention includes a first cavity portion 73 and a second cavity portion that are formed to be depressed to a predetermined depth from the inner surfaces of the compression chambers 31 and 32 in order to reduce suction noise. 74. These first and second cavities 73 and 74 are formed on the inner surfaces of the first and second shaft support members 36 and 37 at positions facing the communication holes 71 adjacent to the suction ports 61 and 62, respectively. .

  According to such a configuration, the first and second cavities 73 and 74 serve as Helmholtz resonators when noise is generated by the flow resistance of the suction gas at the initial suction stage of the compression chambers 31 and 32. As a result, the noise of gas inhalation is reduced. A typical Helmholtz resonator consists of a cavity with a small entrance, but when a specific band of incident waves flowing through the small entrance enters the interior of the cavity, a new reflected wave having a waveform opposite to that of the incident wave. The noise and vibration are attenuated by the principle that the reflected wave disappears while the reflected wave goes out of the cavity.

  In the present invention, the first and second cavities 73 and 74 serve as the Helmholtz resonator described above. For example, as shown in FIG. 6, when the second ring piston 52 passes through the second cavity 74, the inlet 74 a of the second cavity 74 is partially opened while being shielded by the second ring piston 52. Is done. At this time, the entrance 74a of the second cavity 74 that is partially opened serves as a small entrance of the Helmholtz resonator, and the internal space 74b of the second cavity 74 serves as a cavity of the Helmholtz resonator. As a result, the second cavity portion 74 serves as a Helmholtz resonator to reduce the suction noise in the second compression chamber 32, and the first cavity portion 73 also has the principle of the first compression chamber 31 as described above. Reduce inhalation noise.

  According to the principle as described above, noise generated from the compression chambers 31 and 32 is reduced without the first cavity 73 and the second cavity 74 being positioned adjacent to the suction ports 61 and 62. become. However, noise associated with gas suction in this rotary compressor often occurs from the suction ports 61 and 62 side having the largest suction flow resistance. In particular, since the rotary compressor has a large flow change of the gas sucked through the suction ports 61 and 62 at the moment when the suction operation is started, the suction noise in the initial stage of the suction operation is also large. Therefore, as shown in the present embodiment, the first cavity 73 and the second cavity 74 may be positioned adjacent to the suction ports 61 and 62 in order to enhance the attenuation effect of the suction noise. preferable.

It is sectional drawing which showed the structure of the multi-cylinder rotary compressor by one Embodiment of this invention. It is the II-II 'sectional view taken on the line of FIG. FIG. 3 is a sectional view taken along line III-III ′ of FIG. 1. FIG. 4 is a detailed view of a part IV in FIG. 1. It is the perspective view which showed the structure of the communicating hole and the 1st and 2nd cavity part of the multicylinder rotary compressor by this invention. It is the figure which showed the state which the ring piston of the multicylinder rotary compressor by this invention closed a part of cavity. It is sectional drawing which showed the structure of the multi-cylinder rotary compressor by other embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Airtight container 11 Intake piping 12 Discharge piping 13 Accumulator 20 Electric mechanism part 21 Rotating shaft 22 Stator 23 Rotor 30 Compression mechanism parts 31 and 32 1st and 2nd compression chambers 33 and 34 1st and 2nd cylinder body 35 Partition Plates 36, 37 First and second shaft support members 40, 50 First and second compression devices 41, 51 First and second eccentric portions 42, 52 Ring pistons 61, 62 Suction ports 63, 64 First and second Suction pipe 71 communication holes 73, 74 first and second cavities

Claims (14)

  Positioned adjacent to the first and second suction ports, the first and second suction chambers separated from each other, the first and second suction ports communicating with the insides of the first and second compression chambers, respectively. A multi-cylinder rotary compressor comprising a communication hole for communicating the first compression chamber and the second compression chamber.   The first and second cavities formed in the inner surfaces of the first and second compression chambers at a predetermined depth at a position adjacent to the communication hole. Multi-cylinder rotary compressor.   The multi-cylinder rotary compressor according to claim 2, wherein the first and second cavities are positioned to face the communication hole.   First and second cylinder bodies for forming the first and second compression chambers; first and second compression devices installed in the first and second compression chambers; 2 A rotary shaft installed through the first and second compression chambers to drive the compression device, a partition plate interposed between the first and second cylinder bodies, and opposite the partition plate 4. The multi-cylinder rotation according to claim 3, further comprising first and second shaft support members that are provided on a side and support the rotation shaft while closing the openings of the first and second compression chambers, respectively. Compressor.   The communication hole is formed in the partition plate, and the first and second cavities are formed on the inner surfaces of the first and second shaft support members at positions facing the communication hole. The multi-cylinder rotary compressor according to claim 4.   The first and second compression devices include first and second eccentric portions that are eccentric in opposite directions to the rotation shafts in the first and second compression chambers, respectively, and the first and second compression chambers. First and second ring pistons coupled to outer surfaces of the first and second eccentric parts, respectively, and the first and second compressions while linearly moving in a radial direction by rotation of the first and second ring pistons. 6. The multi-cylinder rotary compressor according to claim 5, further comprising first and second vanes that define an internal space of the chamber.   The multi-cylinder rotary compressor according to claim 6, wherein a maximum width of the communication hole and the first and second cavities is smaller than a radial thickness of the ring piston. First and second cylinder bodies for forming the first and second compression chambers; first and second compression devices installed in the first and second compression chambers; A rotary shaft installed through the first and second compression chambers to drive the two compression devices, and a partition plate interposed between the first and second cylinder bodies,
The multi-cylinder rotary compressor according to claim 1, wherein the communication hole is formed in the partition plate adjacent to the first and second suction ports.   The first and second compression devices are provided with first and second eccentric portions provided on the rotary shafts in the first and second compression chambers so as to be eccentric in a direction opposite to the rotary shaft, and the first And the first and second ring pistons coupled to the outer surfaces of the first and second eccentric portions in the second compression chamber, respectively, and the first and second ring pistons rotate in a linear motion in the radial direction. 9. The multi-cylinder rotary compressor according to claim 8, further comprising first and second vanes that divide an internal space of the first and second compression chambers.   The multi-cylinder rotary compressor according to claim 9, wherein a maximum width of the communication hole and the first and second cavities is smaller than a radial thickness of the ring piston.   The first and second compression chambers that are partitioned from each other, the first and second compression devices that perform the compression operation in a state of being eccentric in opposite directions in the first and second compression chambers, and the first and second compression chambers A first suction port and a second suction port communicating with the interior of the chamber; and a communication hole located adjacent to the first and second suction ports and communicating with the first and second compression chambers. A featured multi-cylinder rotary compressor. A partition plate for partitioning between the first and second compression chambers;
The multi-cylinder rotary compressor according to claim 11, wherein the communication hole is formed in the partition plate.   13. The method according to claim 12, further comprising first and second cavities formed at a position adjacent to the communication hole and recessed to a predetermined depth on inner surfaces of the first and second compression chambers. Multi-cylinder rotary compressor.   The multi-cylinder rotary compressor according to claim 13, wherein the first and second cavities are positioned to face the communication hole.

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