JP2016037865A - Hermetic type compressor and refrigeration cycle device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hermetic type compressor of the present embodiment in which much more amount of liquid refrigerant is injected into a cylinder chamber having a more overheated tendency, thereby the cylinder chambers are cooled with high efficiency, and which therefore can exert improved compression performance and reliability, and to provide a refrigeration device with the hermetic type compressor.SOLUTION: The hermetic type compressor is provided in which an electric motor part and a compression mechanism part connected to the electric motor part are housed in a hermetic container, and the compression mechanism part comprises a first cylinder having a first cylinder chamber and a second cylinder having a second cylinder chamber through an intermediate partition plate. The intermediate partition plate includes a lateral hole extending from an outer circumferential surface toward a central part and an injection pipe for use in guiding liquid refrigerant is connected to the intermediate partition plate. The intermediate partition plate further includes: a first injection port for communicating the lateral hole with the first cylinder chamber; and a second injection port for communicating the lateral hole with the second cylinder chamber. The diameter of the first injection port and a diameter of the second injection port are set to be different from each other.SELECTED DRAWING: Figure 1

Description

  Embodiments described herein relate generally to a hermetic compressor having two cylinder chambers and a refrigeration cycle apparatus that includes the hermetic compressor and constitutes a refrigeration cycle.

  An electric motor part and a compression mechanism part are connected and accommodated in a hermetic container via a rotating shaft, and a hermetic compressor including two cylinder chambers is often used as the compression mechanism part via an intermediate partition plate. The rollers move eccentrically in the respective cylinder chambers to compress the gas refrigerant and discharge it into the sealed container via the discharge valve mechanism.

  In particular, the compressor used for the cooling only machine has a large compression ratio, and the compressed gas refrigerant is likely to rise to an abnormal temperature. Eventually, a thermal adverse effect occurs in each component, and the lubricating oil decreases in viscosity. Therefore, a so-called liquid injection method is adopted in which liquid refrigerant is injected into the cylinder chamber and cooled.

  Patent Document 1 includes a first bearing that supports a rotating shaft and a second bearing, and a liquid injection passage for introducing liquid refrigerant is provided only in the second cylinder chamber via the second bearing. . Patent document 2 improves the structure of the injection copper pipe and injection liner which lead a liquid refrigerant to a compressor.

Japanese Patent No. 4059652 JP 2012-251485 A

  However, in the technique of Patent Document 1, the cooling effect in the second cylinder chamber into which the liquid refrigerant is injected is good, but the cooling effect on the gas refrigerant in the first cylinder chamber is not so great. The cooling effect as a whole is inferior to that of the system in which liquid refrigerant is injected into the first and second cylinder chambers simultaneously.

  In the technique of Patent Document 2, since the liquid refrigerant is guided from the injection copper pipe to the first and second working chambers through the vertical holes having the same diameter, the same amount of the liquid refrigerant is injected into the first and second working chambers. The However, the lower second working chamber is always immersed in the lubricating oil. However, the upper first working chamber has a low ratio of the oil level of the lubricating oil so that the temperature is likely to be high. If the same amount of liquid refrigerant is injected into both working chambers, the first working chamber may fall into an overheated state.

  In view of this, the present embodiment includes a hermetic compressor that can improve compression performance and reliability by injecting more liquid refrigerant into a cylinder chamber that is more likely to be overheated and performing efficient cooling. An object of the present invention is to provide a refrigeration cycle apparatus including a hermetic compressor.

  The hermetic compressor of the present embodiment accommodates an electric motor part and a compression mechanism part connected to the electric motor part via a rotating shaft in a hermetic container, and the compressor part is interposed via an intermediate partition plate. The first cylinder having the first cylinder chamber and the second cylinder having the second cylinder chamber are provided, and the intermediate partition plate is provided with a lateral hole extending from the outer peripheral surface to the central portion and liquid refrigerant is provided. A second injection that connects a guiding injection pipe and that further includes a first injection port that communicates the lateral hole and the first cylinder chamber, and that communicates the lateral hole and the second cylinder chamber. A port was provided, and the diameter of the first injection port and the diameter of the second injection port were set to different diameters.

  The refrigeration cycle apparatus of the present embodiment includes the above-described hermetic compressor, a condenser, an expansion device, and an evaporator, and constitutes a refrigeration cycle, and between the condenser and the expansion device, The injection tube was branched.

The longitudinal cross-sectional view of the hermetic type compressor based on this embodiment, and the refrigerating cycle block diagram of a refrigerating cycle apparatus. The figure which expanded the intermediate partition board part in the circle mark M in FIG. 1 based on the embodiment, and the longitudinal cross-sectional view which followed the centerline O1-O2. The cross-sectional top view of the 1st cylinder based on the embodiment. The figure which expanded the intermediate partition plate part in the circle in FIG. 1 which concerns on the modification of the embodiment.

Hereinafter, the present embodiment will be described with reference to the drawings.
FIG. 1 is a vertical cross-sectional view of a hermetic compressor 1 and a refrigeration cycle configuration diagram of a refrigeration cycle apparatus R that is a cooling only machine, for example.

  In the figure, reference numeral 1 denotes a hermetic compressor (hereinafter simply referred to as “compressor”), which will be described later. A refrigerant pipe P is connected to the upper end of the compressor 1, and a condenser 2, a gas-liquid separator 3, an expansion valve (expansion device) 4, an evaporator 5 and an accumulator 6 are connected to the refrigerant pipe P. Sequentially provided. Further, the refrigerant pipe P branches into two from the accumulator 6 and is connected to the side portion of the compressor 1, and these constitute the refrigeration cycle of the refrigeration cycle apparatus R.

  The refrigeration cycle apparatus R is provided with an injection circuit K. This injection circuit K divides a part of the liquid refrigerant gas-liquid separated by the gas-liquid separator 3 interposed between the condenser 2 and the expansion valve 4 to the injection pipe Pa, and is provided in the injection pipe Pa. It is for guiding to the compressor 1 through the open / close valve 7 and the expansion valve 8 as described later.

Next, the compressor 1 will be described.
The compressor 1 includes a sealed container 10. An electric motor unit 11 is accommodated in the upper side of the hermetic container 10, and a compression mechanism unit 12 is accommodated in the lower side. The electric motor unit 11 and the compression mechanism unit 12 are They are connected via a rotating shaft 13. Lubricating oil S is collected at the inner bottom of the sealed container 10 and the remaining internal space is filled with a high-pressure gas refrigerant compressed by the compression mechanism 12.

  A discharge portion 1 a including a hole is provided on the upper surface portion of the hermetic container 10, and a refrigerant pipe P communicating with the condenser 2 is connected thereto. Further, suction portions 1 b and 2 b each having two holes are provided on the lower peripheral wall of the sealed container 10, and a refrigerant pipe P communicating with the accumulator 6 is connected thereto.

  The electric motor unit 11 has a rotor (rotor) 15 fitted and fixed to the rotary shaft 13 and an inner peripheral surface of the outer peripheral surface of the rotor 15 through a narrow gap. It is comprised from the stator (stator) 16 fixed by fitting.

  The rotary shaft 13 is formed with two columnar eccentric parts a and b that protrude toward the outer peripheral side. These eccentric parts a and b are provided at positions displaced by a predetermined dimension along the axial direction of the rotating shaft 13 and at positions displaced by 180 ° along the rotating direction of the rotating shaft 13.

The compression mechanism section 12 includes a main bearing 17, a first cylinder 18 having an inner diameter hole, an intermediate partition plate 20, a second cylinder 22 having an inner diameter hole, and a sub bearing along the axial direction of the rotary shaft 13. 23.
The main bearing 17 is fixed to the first cylinder 18 by a fixture, and the auxiliary bearing 23 is fixed to the first cylinder 18 via the second cylinder 22 and the intermediate partition plate 20 by the fixture. The main bearing 17 and the auxiliary bearing 23 pivotally support the rotary shaft 13.

  A first muffler case 25, which is a hollow case surrounding the periphery, is attached to the main bearing 17, and a muffler chamber is formed inside. Further, the first muffler case 25 is provided with a plurality of communication holes c that communicate the muffler chamber and the space in the sealed container 10. These communication holes c are located above the liquid surface of the lubricating oil S collected at the inner bottom of the sealed container 10.

  A second muffler case 26, which is a hollow case surrounding the periphery, is attached to the auxiliary bearing 23, and a muffler chamber is formed inside. The sub-bearing 23, the second cylinder 22 and the intermediate partition plate 20 are always reliably immersed in the lubricating oil S. The first cylinder 18 and the first muffler case 25 may be exposed from the lubricating oil S due to the influence of compression conditions and the like.

The first cylinder 18 is fitted and fixed to the inner peripheral wall of the sealed container 10. The inner diameter hole of the first cylinder 18 is closed at the upper end side by the main bearing 17 and the lower end side is closed by the intermediate partition plate 20 to form the first cylinder chamber 18A.
The second cylinder 22 is attached to the first cylinder 18 via the intermediate partition plate 20. The inner diameter hole of the second cylinder 22 is closed at the upper end side by the intermediate partition plate 20, and the lower end side is closed by the auxiliary bearing 23 to form a second cylinder chamber 22 </ b> A.

The rotary shaft 13 is inserted into the first and second cylinder chambers 18A and 22A, and one eccentric portion a formed on the rotary shaft 13 is located in the first cylinder chamber 18A and formed on the rotary shaft 13. The other eccentric portion b is located in the second cylinder chamber 22A.
A roller 27 is fitted to one eccentric part a, and a roller 28 is fitted to the other eccentric part b. These rollers 27 and 28 roll while a part of the outer peripheral wall abuts against the inner peripheral walls of the first and second cylinder chambers 18A and 22A as the rotary shaft 13 rotates.

  The first and second cylinder chambers 18A and 22A are respectively provided with blades 30 and 31 so as to be slidable. The tip portions of the blades 30 and 31 are urged by an elastic body d such as a spring and the rollers 27 and 31 are urged. 28 abuts against the outer peripheral wall.

  A part of the outer peripheral wall of the rollers 27 and 28 abuts a part of the inner peripheral wall of the first and second cylinder chambers 18A and 22A, and the tips of the blades 30 and 31 are elastically applied to the outer peripheral walls of the rollers 27 and 28. By contact, the first and second cylinder chambers 18A and 22A are partitioned into two spaces whose volumes change as the rollers 27 and 28 roll.

  The first cylinder 18 is provided with the suction portion 1b for sucking low-pressure gas refrigerant into the first cylinder chamber 18A. The second cylinder 22 is provided with the suction portion 2b for sucking low-pressure gas refrigerant into the second cylinder chamber 22A.

  A flange portion of the main bearing 17 is provided with a first discharge valve mechanism 33 that is opened and closed by the eccentric motion of the roller 27. By opening the first discharge valve mechanism 33, the first cylinder chamber 18A and the muffler chamber in the first muffler case 25 attached to the main bearing 17 are communicated with each other.

  The flange portion of the auxiliary bearing 23 is provided with a second discharge valve mechanism 34 that is opened and closed by the eccentric motion of the roller 28. By opening the second discharge valve mechanism 34, the second cylinder chamber 22A communicates with the muffler chamber in the second muffler case 26 attached to the sub bearing 23.

  The muffler chamber in the first muffler case 25 attached to the main bearing 17 and the muffler chamber in the second muffler case 26 attached to the sub bearing 23 are the flange portion of the main bearing 17 and the first cylinder 18. And the intermediate partition plate 20, the second cylinder 22, and a discharge guide flow path (not shown) provided in the flange portion of the auxiliary bearing 23.

  On the other hand, the injection pipe Pa constituting the injection circuit K passes through the hole provided in the side portion of the sealed container 10 and is inserted into the sealed container 10 so as to face the intermediate partition plate 20. The intermediate partition plate 20 is provided with a lateral hole 35 from the side portion (outer peripheral surface) toward the center portion, and the distal end portion of the injection pipe Pa is inserted into the lateral hole 35 and closely fitted.

  At the center of the intermediate partition plate 20, there is provided an insertion hole 20a through which the portion between the eccentric parts a and b of the rotating shaft 13 is inserted, and the tip of the horizontal hole 35 does not reach the insertion hole 20a. It ends on the near side. The tip of the injection tube Pa does not reach the tip of the horizontal hole 35, and is dimensioned so as to have a certain gap.

  A first injection port 36a and a second injection port 36b each including a vertical hole are provided in a portion of the horizontal hole 35 between the distal end of the injection tube Pa and the distal end of the horizontal hole 35.

2A is an enlarged view of a part of the intermediate partition plate 20 indicated by a circle M in FIG. 1, and FIG. 2B is a longitudinal sectional view further along the center line O1-O2. It is.
An insertion hole 20a through which a part of the rotary shaft 13 is inserted is provided at the center of the intermediate partition plate 20 and has a ring shape in plan view. Further, a lateral hole 35 is provided from a part of the peripheral wall toward the central axis O of the insertion hole 20a. Naturally, the diameter of the lateral hole 35 is set within the range of the thickness of the intermediate partition plate 20.

  A first injection port 36 a is provided at a position slightly in front of the front end of the horizontal hole 35 so as to communicate with the upper surface of the intermediate partition plate 20 and the horizontal hole 35. A second injection port 36b is provided in communication with the lower surface of the intermediate partition plate 20 and the lateral hole 35.

The distance La from the central axis O of the intermediate partition plate 20 and the insertion hole 20a to the central axis O1 of the first injection port 36a and the central axis O of the insertion hole 20a of the intermediate partition plate 20 to the second injection port 36b. The distances Lb to the central axis O2 are the same (La = Lb) and intersect the horizontal hole 35 vertically.
That is, the first and second injection ports 36a and 36b are provided at the same angular position in the circumferential direction and at positions where the positions of the central axes O1 and O2 coincide with each other.

The diameter φd1 of the first injection port 36a and the diameter φd2 of the second injection port 36b are different from each other. Here, the diameter φd1 of the first injection port 36a is set larger than the diameter φd2 of the second injection port 36b (φd1> φd2).
As described above, by making the distance La and the distance Lb the same, even if the diameters of the first and second injection ports 36a and 36b are different, it can be easily processed.

  In such a configuration, when the electric motor unit 11 is energized, the rotating shaft 13 rotates and the compression mechanism unit 12 is driven, whereby the first and second cylinder chambers 18A and 22A partitioned by the blades 30 and 31 are driven. One of the spaces is made negative and gas refrigerant flows in.

  The rollers 27 and 28 provided with a phase difference of 180 ° roll as the rotary shaft 13 rotates, and the gas refrigerant flowing into the first and second cylinder chambers 18A and 22A flows into one space. The volume is compressed by gradually decreasing.

  When compressed to a predetermined pressure, the first discharge valve mechanism 33 is opened and discharged from the first cylinder chamber 18A to the muffler chamber of the first muffler case 25. Further, the second discharge valve mechanism 34 is opened with an interval of 180 °, and discharged from the second cylinder chamber 22A to the muffler chamber of the second muffler case 26.

  Thereafter, the gas refrigerant discharged into the second muffler case 26 is discharged from the second cylinder 22, the intermediate partition plate 20, the first cylinder 18, and the main bearing 17. It is guided to the muffler chamber in the first muffler case 25 through the flow path. And it is guide | induced to the space in the airtight container 10 from the communicating hole c with the gas refrigerant with which this muffler room is filled.

  The high-temperature and high-pressure gas refrigerant that fills the sealed container 10 of the compressor 1 flows through the refrigerant pipe P connected to the discharge unit 1 a and is guided to the condenser 2. Here, the liquid is condensed and led to the gas-liquid separator 3, further gas-liquid separated and once collected. Thereafter, the liquid refrigerant is decompressed by the expansion valve 4 and evaporated by the evaporator 5. Ambient air is cooled by this evaporation, and the refrigeration cycle apparatus R exhibits refrigeration (cooling) capability.

  The refrigerant exiting the evaporator 5 is gas-liquid separated by the accumulator 6, and is guided to the first cylinder chamber 18A and the second cylinder chamber 22A via the first and second suction portions 1b and 2b of the compressor 1. It is compressed. Then, it is compressed again as described above, and circulates in the above-mentioned system path.

  On the other hand, as the compressor 1 is operated, the temperature of the gas refrigerant that is compressed in the first and second cylinder chambers 18A and 22A and fills the sealed container 10 rises and is discharged to the refrigerant pipe P. The temperature of P rises.

  When a temperature sensor (not shown) attached to the refrigerant pipe P detects a predetermined temperature or higher, a detection signal is sent to a control means (not shown). The control means performs control to open the on-off valve 7 of the injection circuit K.

  The gas-liquid separator 3 that collects the refrigerant liquefied by the condenser 2 functions as a liquid receiver, from which a part of the liquid refrigerant is guided to the injection pipe Pa. The expansion valve 8 has a function as a flow rate adjusting valve that adjusts the opening according to the temperature detected by the temperature sensor.

  The liquid refrigerant guided to the injection pipe Pa in the compressor 1 is divided into the first injection port 36a and the second injection port 36b from the distal end portion of the lateral hole 35 of the intermediate partition plate 20.

  The liquid refrigerant is guided from the first injection port 36a to the first cylinder chamber 18A, and is injected into the gas refrigerant in the middle of compression in the first cylinder chamber 18A, thereby cooling the gas refrigerant. Further, the liquid refrigerant is guided from the second injection port 36b to the second cylinder chamber 22A and is injected into the gas refrigerant in the middle of compression in the second cylinder chamber 22A to cool the gas refrigerant.

FIG. 3 is a plan view of the first cylinder chamber 18A. In this first cylinder chamber 18A, the roller 27 moves from the solid line position to the solid line position via the alternate long and short dash line position in the counterclockwise direction that is the arrow direction. Eccentric motion continuously.
In the first cylinder chamber 18A, the position where the roller 27 (the eccentric direction of the eccentric part a) coincides with the direction of the blade 30 is defined as the reference position (0 °), and the roller 27 is rotated 6 ° counterclockwise from the reference position. At the position, the first injection port 36a starts to be opened from the lower end surface of the roller 27, and the liquid refrigerant is injected into the first cylinder chamber 18A.

  The opening of the first injection port 36a is maintained while the rotation angle is increased by the eccentric rotational movement of the roller 27. Accordingly, the liquid refrigerant is continuously injected from the first injection port 36a into the first cylinder chamber 18A, and the gas refrigerant compressed in the first cylinder chamber 18A is cooled.

  When the rotational angle position of the roller 27 exceeds 180 ° and reaches 210 °, the lower end surface of the roller 27 starts to close the first injection port 36a. Therefore, the amount of liquid refrigerant injected from the first injection port 36a into the first cylinder chamber 18A gradually decreases.

  When the rotational angle position of the roller 27 (the eccentric direction of the eccentric part a) reaches 212 °, the first injection port 36a is completely closed by the lower end surface of the roller 27, and the liquid refrigerant to the first cylinder chamber 18A is blocked. The injection stops.

  This state continues until the rotation angle position of the roller 27 exceeds 360 ° and reaches 6 °, and when it reaches 6 °, the first injection port 36a is opened again from the lower end surface of the roller 27 as described above. The above operation is repeated.

  In the second cylinder chamber 22A, since the position of the roller 28 is provided at a position 180 ° opposite to the roller 27 in the first cylinder chamber 18A, the second injection port 36b is opened and closed at different timings. To do.

  In addition, since the diameter φd2 of the second injection port 36b is smaller than the diameter φd1 of the first injection port 36a, the rotation angle range of the roller 28 that the second injection port 36b opens is such that the first injection port 36a opens. The rotation angle range of the roller 27 (6 ° to 212 °) is smaller.

As described above, the diameter φd1 of the first injection port 36a and the diameter φd2 of the second injection port 36b are set to different diameters.
Here, the first cylinder 18 provided with the first cylinder chamber 18A is provided at the upper part of the intermediate partition plate 20, and the second cylinder 22 provided with the second cylinder chamber 22A is provided at the lower part of the intermediate partition plate 20. It was. The second cylinder 22 is always immersed in the lubricating oil S collected at the bottom of the sealed container 10, but the first cylinder 18 is often exposed from the oil surface of the lubricating oil S due to compression conditions.

  Therefore, the diameter φd1 of the first injection port 36a is set larger than the diameter φd2 of the second injection port 36b (φd1> φd2). The amount of liquid refrigerant injected into the first and second cylinder chambers 18A and 22A is proportional to the diameter of the first and second injection ports 36a and 36b. Therefore, the amount of liquid refrigerant injected into the first cylinder chamber 18A is larger than the amount of liquid refrigerant injected into the second cylinder chamber 22A.

  Since the second cylinder 22 is constantly immersed and cooled in the lubricating oil S collected at the inner bottom of the sealed container 10, the amount of liquid refrigerant injected into the second cylinder chamber 22A is the first amount. Even if it is less than the amount of liquid refrigerant injected into one cylinder chamber 18A, it does not fall into an overheated state.

  On the other hand, the first cylinder 18 is located at the upper part of the intermediate partition plate 20, and normally the lubricating oil S is collected up to the flange part of the main bearing 17 attached to the upper part, but depending on the compression conditions. The liquid level of the lubricating oil S is lowered, and the first cylinder 18 is often exposed from the oil level of the lubricating oil S.

  That is, even if the first cylinder chamber 18A and the second cylinder chamber 22A perform the same compression action, the temperature of the first cylinder chamber 18A is more likely to rise than that of the second cylinder chamber 22A. Therefore, the amount of liquid refrigerant injected into the first cylinder chamber 18A is increased through the first injection port 36a. By performing efficient cooling, the compression performance can be improved.

FIG. 4 is an enlarged longitudinal sectional view showing a part of the intermediate partition plate 20 showing a modification of the present embodiment.
Basically, the first injection port 36a1 is provided in communication with the upper surface of the intermediate partition plate 20 and the horizontal hole 35, and the second injection port 36b1 is provided in communication with the lower surface of the intermediate partition plate 20 and the horizontal hole 35. There is no change. It is also the same that the diameter d1φ of the first injection port 36a1 is set larger (φd1> φd2) than the diameter d2φ of the second injection port 36b1.

  Here, the distance L from the center axis O of the insertion hole 20a of the intermediate partition plate 20 to the farthest inner peripheral surfaces of the first and second injection ports 36a1 and 36b1 is made the same.

  In other words, without changing the diameters φd1 and φd2 of the first and second injection ports 36a1 and 36b1 from those shown in FIG. 2, the center line O1 of the first injection port 36a1 having a large diameter is The second injection port 36b1 is provided so as to be shifted from the center line O2 of the second injection port 36b1 in the direction of the center axis O of the insertion hole 20a of the intermediate partition plate 20.

  Therefore, with respect to the distance La from the center axis O of the insertion hole 20a of the intermediate partition plate 20 to the center line O1 of the first injection port 36a1, the second injection from the center axis O of the insertion hole 20a of the intermediate partition plate 20 is performed. The distance Lb to the center line O2 of the port 36b1 becomes large.

In the first and second cylinder chambers 18A and 22A, the rollers 27 and 28 make an eccentric rotational movement to open and close the first and second injection ports 36a1 and 36b1.
More specifically, for example, in the first cylinder chamber 18A, the roller 27 performs eccentric rotational movement, and in the first cylinder chamber 18A, the roller 27 (the eccentric direction of the eccentric portion a) coincides with the direction of the blade 30. The first injection port 36a1 is opened from the lower end surface of the roller 27 at a position where the roller 27 is rotated by 6 ° counterclockwise from the reference position.

  From a microscopic viewpoint, it begins to be opened from the outer peripheral end of the first injection port 36a1, and at the same time, the injection of the liquid refrigerant into the first cylinder chamber 18A is started. As the roller 27 rotates, the open area of the first injection port 36a1 gradually increases, and the amount of liquid refrigerant injected increases.

  When the lower end surface of the roller 27 is completely separated from the first injection port 36a1, the liquid refrigerant injection amount becomes maximum, and the state (liquid refrigerant injection amount) is maintained until the first injection port 36a1 is closed again. Is done.

  When the rotational angle position of the roller 27 (eccentric direction of the eccentric portion a) reaches 212 °, the first injection port 36a1 is closed at the lower end surface of the roller 27. At this time, the first injection port 36a It begins to close gradually from the outer edge. The injection amount of the liquid refrigerant is stopped in a state where the injection amount of the liquid refrigerant is reduced and the lower end surface of the roller 27 completely closes the first injection port 36a1.

  Since the distance L from the insertion hole 20a central axis O of the intermediate partition plate 20 to the farthest inner peripheral surfaces of the first and second injection ports 36a1, 36b1 is the same, the second injection port The rotation angle range of the roller 28 opened by 36b1 is also substantially the same as the rotation angle range (6 ° to 212 °) of the roller 27 opened by the first injection port 36a1.

  Therefore, the rotation angle ranges of the rollers 27 and 28 for opening and closing the first and second injection ports 36a1 and 36b1 having different diameters can be made substantially the same, and effective cooling can be achieved.

  In each of the above embodiments, the diameter of the first injection port 36a that guides the liquid refrigerant to the first cylinder chamber 18A located on the upper side of the intermediate partition plate 20 is set to be lower than that of the intermediate partition plate 20. The second cylinder chamber 22A has a diameter larger than the diameter of the second injection port 36b that guides the liquid refrigerant to the second cylinder chamber 22A. However, the second cylinder chamber 22A is more compressed than the first cylinder chamber 18A. In the machine, the diameter φd2 of the second injection port 36b may be formed larger than the diameter φd1 of the first injection port 36a (φd1 <φd2).

  As mentioned above, although this embodiment was described, the above-mentioned embodiment is shown as an example and does not intend limiting the range of embodiment. The novel embodiment can be implemented in various other forms, and various omissions, substitutions, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

  DESCRIPTION OF SYMBOLS 1 ... Sealed compressor, 10 ... Sealed container, 11 ... Electric motor part, 13 ... Rotating shaft, 12 ... Compression mechanism part, 20 ... Intermediate partition plate, 18A ... 1st cylinder chamber, 18 ... 1st cylinder, 22A 2nd cylinder chamber, 22 ... 2nd cylinder, Pa ... injection pipe, 36a ... 1st injection port, 36b ... 2nd injection port, O1 ... central axis (of 1st injection port), O2 ... Central axis (of second injection port), 2 ... condenser, 4 ... expansion valve (expansion device), 5 ... evaporator, R ... refrigeration cycle device

Claims (5)

In an airtight container, an electric motor part and a compression mechanism part connected to the electric motor part via a rotating shaft are accommodated,
In the hermetic compressor including the first cylinder having the first cylinder chamber and the second cylinder having the second cylinder chamber via the intermediate partition plate, the compression mechanism section includes:
The intermediate partition plate is provided with a lateral hole extending from the outer peripheral surface toward the central portion and connected to an injection pipe for guiding the liquid refrigerant, and further includes a first injection port that communicates the lateral hole with the first cylinder chamber. And providing a second injection port that communicates the lateral hole and the second cylinder chamber,
A hermetic compressor, wherein the diameter of the first injection port and the diameter of the second injection port are set to different diameters. The compression mechanism section includes the first cylinder at an upper portion of the intermediate partition plate, and the second cylinder at a lower portion of the intermediate partition plate,
2. The hermetic compressor according to claim 1, wherein a diameter φd1 of the first injection port is set larger than a diameter φd2 of the second injection port (φd1> φd2). 3. The hermetic compressor according to claim 2, wherein the first injection port and the second injection port are provided at positions where their central axes coincide with each other. The first injection port and the second injection port have the same first injection port so that the distance from the center axis of the rotation hole of the intermediate partition plate to the innermost surface farthest from the insertion hole is the same. 3. The hermetic compressor according to claim 2, wherein a central axis of the second partition is shifted from a central axis of the second injection port in a direction of a central axis of the intermediate partition plate. A hermetic compressor according to any one of claims 1 to 4, a condenser, an expansion device, and an evaporator, comprising a refrigeration cycle, and comprising the condenser and the expansion device A refrigeration cycle apparatus characterized in that the injection pipe is branched from between.

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