JP2012072679A - Compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compressor capable of inhibiting vibration in a muffler and reducing noise.SOLUTION: An intermediate end plate member 70 is sandwiched between first and second cylinders 121 and 221. Thus, rigidity of the intermediate end plate member 70 is improved. Since the intermediate end plate member 70 includes a second muffler chamber 242, the muffler can be structured of the intermediate end plate member 70 improved in rigidity. Therefore, the vibration in the muffler can be inhibited and the noise can be reduced.

Description

  The present invention relates to a compressor used in, for example, an air conditioner or a refrigerator.

  2. Description of the Related Art Conventionally, there is a compressor provided with a compression element and a motor that drives the compression element via a shaft in an airtight container (see JP 2008-2364 A: Patent Document 1).

  The compression element has an upper bearing, an upper cylinder, an intermediate partition plate, a lower cylinder, and a lower bearing in order from the top to the bottom along the rotation axis of the shaft. A sheet metal-like upper muffler cover is attached to the upper side of the upper bearing to constitute an upper muffler chamber communicating with the upper cylinder. A sheet metal-like lower muffler cover is attached to the lower side of the lower bearing to constitute a lower muffler chamber communicating with the lower cylinder.

  However, in the above conventional compressor, the lower muffler chamber is constituted by a sheet metal-like lower muffler cover. Therefore, the rigidity of the lower muffler cover is low, and vibration is generated by the lower muffler cover having low rigidity. There was a problem that noise was generated. In particular, the vibration of the muffler is transmitted to the lubricating oil in the closed container, and the closed container is shaken by the vibration of the lubricating oil.

JP 2008-2364 A

  Therefore, an object of the present invention is to provide a compressor that can suppress vibration in a muffler and reduce noise.

In order to solve the above problems, the compressor of the present invention is:
A compression element;
A motor for driving the compression element via a shaft;
The compression element is
Two adjacent cylinders,
A roller provided in each of the two cylinders and fitted to the shaft;
An end plate member sandwiched between the two cylinders,
The end plate member has a muffler chamber communicating with one of the cylinders.

  According to the compressor of the present invention, since the end plate member is sandwiched between the two cylinders, the rigidity of the end plate member is increased. And since an end plate member has a muffler chamber, a muffler can be comprised with the end plate member which made rigidity high, the vibration in a muffler can be suppressed, and a noise can be reduced. In particular, transmission of vibration to the lubricating oil in the sealed container can be prevented, and shaking of the sealed container due to vibration of the lubricating oil can be prevented.

In the compressor of one embodiment,
A part of the muffler chamber constitutes a stagnation space that prevents the ingress of compressed gas from the inside of the one cylinder.
This stagnation space overlaps the compressed gas suction side in the one cylinder and the compressed gas suction side in the other cylinder as viewed from the axial direction of the one cylinder.

  According to the compressor of this embodiment, the stagnation space of the muffler chamber overlaps with the suction side of the compressed gas in each cylinder when viewed from the axial direction of the one cylinder, so the high-temperature and high-pressure compression that has entered the muffler chamber The gas is prevented from entering the stagnation space, which is a portion overlapping the low temperature and low pressure suction side in each cylinder.

  For this reason, the high-temperature and high-pressure compressed gas in the muffler chamber is unlikely to be deprived of heat to the low-temperature and low-pressure suction side in each cylinder. On the other hand, the low-temperature and low-pressure compressed gas sucked into each cylinder is not easily given heat from the high-temperature and high-pressure compressed gas in the muffler chamber. Therefore, compression efficiency can be improved.

  According to the compressor of the present invention, since the end plate member sandwiched between the two cylinders has the muffler chamber, the muffler can be constituted by the end plate member having increased rigidity. In addition, vibrations in the muffler can be suppressed and noise can be reduced.

It is sectional drawing which shows 1st Embodiment of the compressor of this invention. It is a top view which shows the cover part of an intermediate | middle end plate member. It is a top view which shows the main-body part of an intermediate | middle end plate member. It is a top view of the principal part of a compressor. It is a top view which shows 2nd Embodiment of the compressor of this invention, and shows the main-body part of an intermediate end plate member.

  Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments.

(First embodiment)
FIG. 1 is a sectional view showing a first embodiment of a compressor according to the present invention. The compressor includes an airtight container 1, a compression element 2 disposed in the airtight container 1, and a motor 3 disposed in the airtight container 1 and driving the compression element 2 via the shaft 12. I have. The compressor is a so-called high-pressure dome type, and the compression element 2 is disposed below and the motor 3 is disposed above in the sealed container 1.

  The motor 3 includes a rotor 6 and a stator 5 disposed on the outer side in the radial direction of the rotor 6 via an air gap. The shaft 12 is attached to the rotor 6.

  The rotor 6 includes, for example, a rotor body made of laminated electromagnetic steel plates and a magnet embedded in the rotor body. The stator 5 includes a stator body made of, for example, iron and a coil wound around the stator body.

  The motor 3 rotates the rotor 6 together with the shaft 12 by the electromagnetic force generated in the stator 5 by passing an electric current through the coil, and drives the compression element 2 via the shaft 12.

  A suction pipe 11 for sucking refrigerant gas as compressed gas is attached to the closed container 1, and an accumulator 10 is connected to the suction pipe 11. That is, the compression element 2 sucks the refrigerant gas from the accumulator 10 through the suction pipe 11.

  The refrigerant gas is obtained by controlling a condenser, an expansion mechanism, and an evaporator (not shown) that constitute an air conditioner as an example of a refrigeration system together with the compressor.

  The compressor discharges compressed high-temperature and high-pressure discharge gas from the compression element 2 and fills the inside of the hermetic container 1, and passes through a gap between the stator 5 and the rotor 6 of the motor 3. After the motor 3 is cooled, it is discharged from the discharge pipe 13 to the outside. Lubricating oil 9 is stored in the lower portion of the high-pressure region in the sealed container 1.

  The compression element 2 includes an upper end plate member 50, a first cylinder 121, an intermediate end plate member 70, and a second cylinder 221 in order from top to bottom along the rotation axis of the shaft 12. And a lower end plate member 60.

  The upper end plate member 50 and the intermediate end plate member 70 are attached to upper and lower open ends of the first cylinder 121, respectively. The intermediate end plate member 70 and the lower end plate member 60 are attached to the upper and lower open ends of the second cylinder 221, respectively.

  A first cylinder chamber 122 is formed by the first cylinder 121, the upper end plate member 50, and the intermediate end plate member 70. The second cylinder chamber 222 is formed by the second cylinder 221, the lower end plate member 60, and the intermediate end plate member 70.

  The upper end plate member 50 includes a disk-shaped main body 51 and a boss 52 provided upward in the center of the main body 51. The main body 51 and the boss 52 are inserted through the shaft 12. The main body 51 is provided with a discharge port 51 b that communicates with the first cylinder chamber 122.

  A discharge valve (not shown) is attached to the main body 51 so as to be located on the opposite side of the main body 51 from the first cylinder 121. This discharge valve is, for example, a reed valve, and opens and closes the discharge port 51b.

  A flat first muffler cover 140 is attached to the main body 51 so as to cover the discharge valve 131 on the side opposite to the first cylinder 121. The first muffler cover 140 is fixed to the main body 51 by a fixing member (such as a bolt). The first muffler cover 140 is inserted through the boss portion 52.

  A first muffler chamber 142 is formed by the first muffler cover 140 and the upper end plate member 50. The first muffler chamber 142 and the first cylinder chamber 122 are communicated with each other through the discharge port 51b.

  A cup-shaped third muffler cover 340 is attached to the first muffler cover 140 so as to cover the side opposite to the upper end plate member 50. A third muffler chamber 342 is formed by the first muffler cover 140 and the third muffler cover 340.

  The first muffler chamber 142 and the third muffler chamber 342 are communicated with each other through a hole formed in the first muffler cover 140. The third muffler chamber 342 and the outside of the third muffler cover 340 are communicated with each other through a hole formed in the third muffler cover 340.

  The lower end plate member 60 includes a disc-shaped main body portion 61 and a boss portion 62 provided downward in the center of the main body portion 61. The main body 61 and the boss 62 are inserted through the shaft 12.

  As shown in FIGS. 1, 2, and 3, the intermediate end plate member 70 is sandwiched between the first cylinder 121 and the second cylinder 221 that are adjacent to each other. The end plate member 70 includes a disk-shaped main body 71 and a lid 72 that covers the main body 71. The main body 71 comes into contact with the second cylinder 221, and the lid 72 comes into contact with the first cylinder 121.

  The main body 71 is provided with an annular recess 71a. A discharge port 71b communicating with the second cylinder chamber 222 is provided on the bottom surface of the recess 71a. A discharge valve (not shown) is attached to the main body 71 so as to be located on the opposite side of the main body 71 from the second cylinder 221, and the discharge valve opens and closes the discharge port 71b.

  A second muffler chamber 242 is formed by the concave portion 71 a and the lid portion 72 of the main body portion 71. The second muffler chamber 242 and the second cylinder chamber 222 communicate with each other through the discharge port 71b.

  The second muffler chamber 242 and the first muffler chamber 142 include a communication hole 72 a provided in the lid portion 72 of the intermediate end plate member 70 and a communication hole provided in the first cylinder 121. 121a and the communication hole 51a provided in the upper end plate member 50 communicate with each other.

  The end plate members 50, 60, 70, the cylinders 121, 221 and the muffler covers 140, 340 are integrally fixed by a fixing member such as a bolt. The upper end plate member 50 of the compression element 2 is attached to the sealed container 1 by welding or the like.

  One end of the shaft 12 is supported by the upper end plate member 50 and the lower end plate member 60. That is, the shaft 12 is cantilevered. One end portion (support end side) of the shaft 12 enters the inside of the first cylinder chamber 122 and the second cylinder chamber 222.

  The shaft 12 is provided with a first eccentric pin 126 so as to be positioned in the first cylinder chamber 122. A first roller 127 is fitted to the first eccentric pin 126. The first roller 127 is disposed in the first cylinder chamber 122 so as to be capable of revolving the central axis of the first cylinder chamber 122, and performs a compression action by the revolving motion of the first roller 127. I have to.

  The shaft 12 is provided with a second eccentric pin 226 so as to be positioned in the second cylinder chamber 222. A second roller 227 is fitted to the second eccentric pin 226. The second roller 227 is disposed in the second cylinder chamber 222 so as to be able to revolve the central axis of the second cylinder chamber 222, and performs a compression action by the revolving motion of the second roller 227. I have to.

  The first eccentric pin 126 and the second eccentric pin 226 are at a position shifted by 180 ° with respect to the rotation axis of the shaft 12.

  Next, the compression action of the first cylinder chamber 122 will be described.

  As shown in FIG. 4, the inside of the first cylinder chamber 122 is partitioned by a blade 128 provided integrally with the first roller 127. That is, in the chamber on the right side of the blade 128, one of the suction pipes 11 opens on the inner surface of the first cylinder chamber 122 to form a refrigerant gas suction chamber (low pressure chamber) 123. On the other hand, in the left chamber of the blade 128, the discharge port 51b (shown in FIG. 1) opens to the inner surface of the first cylinder chamber 122 to form a refrigerant gas discharge chamber (high pressure chamber) 124. Yes.

  Semi-cylindrical bushes 125, 125 are in close contact with both surfaces of the blade 128 for sealing. The bushes 125 and 125 are held by the first cylinder 121. That is, the blade 128 is supported by the first cylinder 121. Lubrication is performed between the blade 128 and the bushes 125 and 125, and between the bush 125 and the first cylinder 121.

  Then, the first eccentric pin 126 rotates eccentrically with the shaft 12, and the first roller 127 fitted to the first eccentric pin 126 moves the outer peripheral surface of the first roller 127. Revolving in contact with the inner peripheral surface of the first cylinder chamber 122.

  As the first roller 127 revolves in the first cylinder chamber 122, the blade 128 advances and retreats with both side surfaces of the blade 128 held by the bushes 125, 125. Then, a low-pressure refrigerant gas is sucked into the suction chamber 123 from the suction pipe 11 and compressed to a high pressure in the discharge chamber 124, and then a high-pressure refrigerant gas is supplied from the discharge port 51b (shown in FIG. 1). Discharge.

  Thereafter, as shown in FIG. 1, the refrigerant gas discharged from the discharge port 51 b passes through the first muffler chamber 142 and the third muffler chamber 342, and is outside the third muffler cover 340. To be discharged.

  On the other hand, the compression action of the second cylinder chamber 222 is the same as the compression action of the first cylinder chamber 122. In other words, low-pressure refrigerant gas is sucked into the second cylinder chamber 222 from the other suction pipe 11, and the refrigerant gas is compressed by the revolving motion of the second roller 227 in the second cylinder chamber 222. The high-pressure refrigerant gas is discharged to the outside of the third muffler cover 340 via the second muffler chamber 242, the first muffler chamber 142, and the third muffler chamber 342.

  The compression action of the first cylinder chamber 122 and the compression action of the second cylinder chamber 222 are in a phase shifted by 180 °.

  According to the compressor having the above configuration, the intermediate end plate member 70 is sandwiched between the first and second cylinders 121 and 221, so that the rigidity of the intermediate end plate member 70 is increased. . Since the intermediate end plate member 70 has the second muffler chamber 242, the intermediate end plate member 70 having increased rigidity can constitute a muffler, suppress vibrations in the muffler, and reduce noise. Can be reduced. In particular, transmission of vibration to the lubricating oil 9 in the closed container 1 can be prevented, and shaking of the closed container 1 due to vibration of the lubricating oil 9 can be prevented.

(Second Embodiment)
FIG. 5 shows a second embodiment of the compressor of the present invention. The difference from the first embodiment will be described. In the second embodiment, the configuration of the intermediate end plate member is different. Note that the same reference numerals as those in the first embodiment have the same configurations as those in the first embodiment, and thus description thereof is omitted.

  As shown in FIG. 5, a part of the second muffler chamber 242 </ b> A of the intermediate end plate member 70 </ b> A constitutes a stagnation space 180 that prevents the compressed gas from entering the first cylinder 121. In FIG. 5, the stagnation space 180 is indicated by hatching for easy understanding.

  The stagnation space 180 is seen from the axial direction of the second cylinder 221 (that is, the axial direction of the shaft 122a of the first cylinder 121, the axial direction of the shaft 12), and the suction side of the compressed gas in the first cylinder 121, and The second cylinder 221 overlaps the compressed gas suction side.

  Here, as shown in FIG. 4, when viewed from the direction of the axis 122 a of the first cylinder 121, the center of the blade 128 and the axis 122 a of the first cylinder 121 in the state of protruding most into the first cylinder chamber 122. Is defined as a central plane S1. 4 and FIG. 5, the stagnation space 180 overlaps the compressed gas suction side (suction pipe 11 side) of the first cylinder chamber 122 rather than the central plane S1.

  Similarly, although not shown, a plane passing through the center of the blade most protruded into the second cylinder chamber 222 and the axis of the second cylinder 221 as viewed from the axial direction of the second cylinder 221 is centered. It is defined as a plane. The stagnation space 180 overlaps the compressed gas suction side (suction pipe 11 side) of the second cylinder chamber 222 rather than the central plane.

  The stagnation space 180 is formed between the two barriers 181 and 181. The barrier 181 extends in the radial direction and is integrally formed in the recess 71a of the main body 71A. The barrier 181 and the lid 72 (see FIG. 2) may be in contact with each other, or may have a slight gap therebetween. That is, the stagnation space 180 is a space that is sealed or opened and prevents the compressed gas from entering.

  According to the compressor configured as described above, the stagnation space 180 of the second muffler chamber 242A overlaps with the compressed gas suction side in each of the cylinders 121 and 221. Therefore, the high-temperature and high-pressure that has entered the second muffler chamber 242A The compressed gas is prevented from entering the stagnation space 180 which is a portion overlapping each of the low-temperature and low-pressure suction sides in the cylinders 121 and 221.

  For this reason, the high-temperature and high-pressure compressed gas in the second muffler chamber 242A is less likely to be deprived of heat to the low-temperature and low-pressure suction sides in the cylinders 121 and 221. On the other hand, the low-temperature and low-pressure compressed gas sucked into the cylinders 121 and 221 is not easily given heat from the high-temperature and high-pressure compressed gas in the second muffler chamber 242A. Therefore, compression efficiency can be improved.

  In addition, this invention is not limited to the above-mentioned embodiment. For example, the feature points of the first and second embodiments may be variously combined. The compression element may be a rotary type in which the roller and the blade are separate bodies. Further, the compression element may be a multistage cylinder type having three or more cylinders, and an end plate member having a muffler chamber may be sandwiched between adjacent cylinders.

DESCRIPTION OF SYMBOLS 1 Airtight container 2 Compression element 3 Motor 5 Stator 6 Rotor 11 Suction pipe 12 Shaft 50 Upper end plate member 60 Lower end plate member 70, 70A Intermediate end plate member 71, 71A Main body part 72 Lid part 121 First Cylinder 122 First cylinder chamber 122a Shaft 123 Suction chamber 124 Discharge chamber 127 Roller 128 Blade 140 First muffler cover 142 First muffler chamber 221 Second cylinder 222 Second cylinder chamber 227 Rollers 242, 242A Second Muffler chamber 340 Third muffler cover 342 Third muffler chamber 180 Stagnation space 181 Barrier S1 Center plane

Claims (2)

A compression element (2);
A motor (3) for driving the compression element (2) via a shaft (12),
The compression element (2)
Two adjacent cylinders (121, 221);
Rollers (127, 227) respectively provided in the two cylinders (121, 221) and fitted to the shaft (12);
An end plate member (70, 70A) sandwiched between the two cylinders (121, 221),
The compressor according to claim 1, wherein the end plate member (70, 70A) includes a muffler chamber (242, 242A) communicating with one of the cylinders (221). The compressor according to claim 1,
Part of the muffler chamber (242, 242A) constitutes a stagnation space (180) that prevents the compressed gas from entering from the one cylinder (221).
The stagnation space (180) is seen from the axial direction of the one cylinder (221), and the compressed gas suction side in the one cylinder (221) and the compressed gas in the other cylinder (121). A compressor characterized by overlapping with the suction side.

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