JP7407365B2 - scroll compressor - Google Patents

Description

The present disclosure relates to a scroll compressor used in refrigeration cycle devices such as air conditioners, water heaters, and refrigerators.

Patent Document 1 discloses a scroll compressor with an injection function. As shown in FIG. 8, this scroll compressor includes a compression mechanism 102 in a closed container 101 and a motor 103 for driving the same, and a gas injection port 105 is formed in a fixed scroll 104 of the compression mechanism 102 to perform compression. An injection pipe 107 is connected to the chamber 106 for introducing an intermediate pressure gas refrigerant.

Patent No. 4614441

The present disclosure suppresses heating of the gas refrigerant flowing inside the injection pipe, increases the injection rate, and provides a highly efficient compressor.

A scroll compressor according to the present disclosure includes a closed container having a discharge atmosphere inside, a compression mechanism section provided in the closed container, an electric motor section for driving the compression mechanism section, and a compression chamber of the compression mechanism section. an injection pipe for injecting refrigerant at an intermediate pressure into the airtight container; a first discharge space through which the refrigerant gas compressed by the compression mechanism is discharged from a discharge port provided near the center of the airtight container; and an outside of the airtight container. a second discharge space provided with a discharge pipe that guides refrigerant gas to the airtight container, and a communication path that communicates the first discharge space and the second discharge space at an eccentric position with respect to the center of the closed container. One or more planes are provided, and a plane including the center of the inflow portion of the communicating path and the central axis of the closed container is a first reference plane, and a plane including the central axis and perpendicular to the first reference plane is a second reference plane. The inflow portion of the communicating path is provided in a first quadrant segment and a second quadrant segment among four segments obtained by dividing the compressor into a plane and dividing the compressor by the first reference plane and the second reference plane. , the segment opposite to the first quadrant segment and adjacent to the second quadrant segment is defined as a third quadrant segment, and the segment opposite to the second quadrant segment and adjacent to the first quadrant segment is defined as a fourth quadrant segment. In this case, the center of the injection pipe for injecting the refrigerant in the intermediate pressure state into the compression chamber is not located in the first quadrant segment or the second quadrant segment, but in the third quadrant segment or the fourth quadrant segment. It is configured in segments.

The scroll compressor according to the present disclosure allows the relatively high temperature refrigerant discharged from the discharge port to flow without passing through the vicinity of the injection pipe, so that the injection pipe is not directly heated, and heating of the refrigerant in the injection pipe can be suppressed. . Therefore, the injection rate can be increased and a highly efficient scroll compressor can be provided.

A vertical cross-sectional view showing the configuration of a scroll compressor according to Embodiment 1. A plan view showing the configuration of a scroll compressor according to Embodiment 1. A cross-sectional view of the compression mechanism section in a state where the fixed scroll and the orbiting scroll of the scroll compressor according to the first embodiment are engaged with each other. Gas injection refrigeration cycle diagram of a refrigeration cycle device using a scroll compressor according to Embodiment 1 A vertical cross-sectional view showing the configuration of a scroll compressor according to a second embodiment. A plan view showing the configuration of a scroll compressor according to a second embodiment. An enlarged sectional view of a main part showing a compression mechanism section of a scroll compressor according to a second embodiment Longitudinal cross-sectional view of a conventional scroll compressor

(Findings, etc. that formed the basis of this disclosure)
At the time the inventors came up with the present disclosure, a scroll compressor disclosed in Patent Document 1 was known. In this scroll compressor, relatively high-temperature discharge refrigerant inside a closed container flows near an injection pipe. As a result, the gas refrigerant in the injection pipe is heated, the gas refrigerant is not introduced into the compression chamber at the optimal pressure, and a sufficient amount of injection cannot be supplied to the compression chamber to make the compressor more efficient. There are challenges. The inventors discovered such a problem, and in order to solve the problem, they came to form the subject matter of the present disclosure.

Therefore, the present disclosure provides a highly efficient compressor that suppresses heating of the gas refrigerant in the injection pipe to increase the injection rate.

Hereinafter, embodiments will be described in detail with reference to the drawings. However, more detailed explanation than necessary may be omitted. For example, detailed explanations of well-known matters or redundant explanations of substantially the same configurations may be omitted. This is to avoid making the following description unnecessarily redundant and to facilitate understanding by those skilled in the art.

The accompanying drawings and the following description are provided to enable those skilled in the art to fully understand the present disclosure, and are not intended to limit the subject matter recited in the claims.

(Embodiment 1)
Embodiment 1 will be described below using FIGS. 1 to 4.

[1-1. composition]
FIG. 1 is a longitudinal cross-sectional view of a compressor according to Embodiment 1 of the present disclosure. 2 is a plan view of the compressor shown in FIG. 1 viewed from above. The operation and effect of the scroll compressor configured as shown in the figure will be explained below.

As shown in FIG. 1, the compressor of the present disclosure is configured by providing a compression mechanism section 10 and an electric motor section 20 inside a closed container 1.

The compression mechanism section 10 includes a main bearing member 11 of the shaft 5 fixed in the closed container 1 by welding or shrink fitting, a fixed scroll 12 bolted onto the main bearing member 11, and the main bearing member 11. It consists of an orbiting scroll 13 which is sandwiched between the fixed scroll 12 and forms a compression chamber 15 between the fixed scroll 12 and the fixed scroll 12 .

A rotation restraint mechanism 14 such as an Oldham ring is provided between the orbiting scroll 13 and the main bearing member 11 to prevent the orbiting scroll 13 from rotating and guide it to move in a circular orbit. By eccentrically driving the orbiting scroll 13 in the portion 5a, the orbiting scroll 13 is caused to move in a circular orbit.

As a result, the compression chamber 15 formed between the fixed scroll 12 and the orbiting scroll 13 moves from the outer circumference toward the center while reducing its volume. Utilizing this movement, refrigerant gas is inhaled from the suction pipe 3 leading to the refrigeration cycle outside the closed container 1 through the suction chamber 16 provided in the fixed scroll 12, which is always at suction pressure, and then closed into the compression chamber 15. After loading, compress it. The refrigerant gas that has reached a predetermined pressure pushes open the reed valve 18 from the discharge port 17 in the center of the fixed scroll 12 and is discharged into the first discharge space 37 .

A pump 6 is provided at the lower end of the shaft 5 that drives the orbiting scroll 13. This pump 6 is arranged such that its suction port is located within the oil storage section 2. Since the pump 6 is driven simultaneously with the scroll compressor, the pump 6 can reliably suck up the oil in the oil storage section 2 provided at the bottom of the closed container 1, regardless of pressure conditions or operating speed. Eliminates the worry of running out of oil. The oil sucked up by the pump 6 is supplied to the compression mechanism section 10 through an oil supply hole 7 passing through the shaft 5. Note that if the configuration is such that foreign matter is removed from the oil using an oil filter or the like before or after the oil is sucked up by the pump 6, foreign matter can be prevented from entering the compression mechanism section 10, and reliability can be further improved. .

The pressure of the oil guided to the compression mechanism section 10 is approximately equal to the discharge pressure of the scroll compressor, and also serves as a back pressure source for the orbiting scroll 13. As a result, the orbiting scroll 13 does not separate from the fixed scroll 12 or hit it unevenly, and stably performs a predetermined compression function. Furthermore, some of the oil enters the fitting part between the eccentric shaft part 5a and the orbiting scroll 13 and the bearing part 8 between the shaft 5 and the main bearing member 11 in search of an escape area due to the supply pressure and its own weight. After lubricating each part, it falls and returns to the oil storage section 2.

Another part of the oil supplied to the high pressure region 35 passes through a path 7a formed in the orbiting scroll 13 and having one open end in the high pressure region 35, to a back pressure chamber in which the rotation restraint mechanism 14 is located. Enter 36. The oil that has entered lubricates the thrust sliding portion and the sliding portion of the rotation restraint mechanism 14, and also plays the role of applying back pressure to the orbiting scroll 13 in the back pressure chamber 36.

Here, compression of refrigerant gas will be explained in detail. FIG. 3 is a cross-sectional view of the compression mechanism section 10 in a state where the orbiting scroll 13 is engaged with the fixed scroll 12, and shows the state in which the phases are shifted in 90 degree increments in the order of (a) to (d). be. Here, a first compression chamber 15a is formed surrounded by the wrap outer wall of the orbiting scroll 13 and the wrap inner wall of the fixed scroll 12, and a compression chamber is formed surrounded by the wrap inner wall of the orbiting scroll 13 and the wrap outer wall of the fixed scroll 12. The compression chamber in which this is done is referred to as a second compression chamber 15b.

FIG. 3A shows the state at the moment when the first compression chamber 15a confines the refrigerant gas, and this compression chamber is designated as 15a-1. Thereafter, the first compression chambers 15a are 15a-2 in (b), 15a-3 in (c), 15a-4 in (d), 15a-5 in (a), 15a-6 in (b), The liquid moves to 15a-7 in (c), and is discharged into the first discharge space 37 through the discharge port 17 formed in the center of the fixed scroll 12 at 15a-8 in (d).

Similarly, in the second compression chamber 15b, (c) of FIG. 3 shows the state at the moment when the second compression chamber 15b confines the refrigerant gas, and the compression chamber 15b sequentially moves toward the center, and the fixed scroll The liquid is discharged into the first discharge space 37 through the discharge port 17 formed at the center of the discharge port 12 .

Here, in the suction chamber 16, where the compression chamber 15a and the compression chamber 15b are always at the suction pressure, the lap of the fixed scroll 12 and the orbiting scroll 13 at the moment when the refrigerant gas is confined for each compression chamber. This is the area downstream from the area where the contact points are connected.

As shown in FIG. 1, the refrigerant gas discharged into the first discharge space 37 flows through the communication passage 39 from the inlet portion 42 of a plurality of communication passages 39 provided at eccentric positions with respect to the center of the closed container 1. The liquid is discharged through the discharge pipe 4 into a second discharge space 38 provided with a discharge pipe 4, and is discharged from the discharge pipe 4 to the outside of the closed container 1.

FIG. 4 is a refrigeration cycle diagram of a refrigeration cycle device according to an embodiment equipped with a compressor of the present disclosure.

As shown in FIG. 4, the refrigeration cycle device of this embodiment includes a compressor 91, a condenser 92, an evaporator 93, a pressure reducer 94, an injection pipe 95, and a gas-liquid separator 96.

In the gas-liquid separator 96, the refrigerant condensed in the condenser 92 is depressurized by the pressure reducer 94, and a part of the evaporated gas refrigerant and liquid refrigerant are separated. The liquid refrigerant further passes through a pressure reducer 94, becomes a low-pressure refrigerant, and is led to an evaporator 93. On the other hand, the gas refrigerant separated by the gas-liquid separator 96 passes through the injection pipe 95 and is guided to the intermediate pressure chamber within the compressor 91. The injection pipe 95 may be provided with a blockage valve or a pressure reducer, and a means for adjusting and stopping the injection pressure may be provided.

The refrigerant is further reduced in pressure to a lower pressure in the pressure reducer 94 and sent to the evaporator 93. The liquid refrigerant is evaporated by heat exchange and is discharged as a gas refrigerant or a gas refrigerant partially mixed with liquid refrigerant. The refrigerant discharged from the evaporator 93 is guided to the suction pipe 3 of the compressor 91 and taken into the compression mechanism inside the compressor.

Regarding the ratio of gas and liquid refrigerant in the refrigerant separated by the gas-liquid separator 96, the larger the pressure difference between the high pressure and the low pressure of the refrigeration cycle, the larger the gas component.

In the scroll compressor of this embodiment, as shown in FIG. 1, one or more injection ports 54 for injecting intermediate pressure refrigerant from the injection pipe 95 are provided on the end plate of the fixed scroll 12. , as shown in FIG. 3, is provided in a position to sequentially open the first and second compression chambers to feed the injection refrigerant, and when the injection port 54 starts opening, both compression chambers are closed. It is installed at a position during the compression process. Thereby, the injection refrigerant can be compressed without flowing back to the suction pipe, so the amount of refrigerant circulation can be increased without reducing efficiency, and highly efficient injection operation is possible.

Here, as shown in FIG. 2, the center line 51 of the inflow portion 42 of the communication passage 39 that communicates the first discharge space 37 and the second discharge space 38 in the closed container 1 and the central axis of the closed container 1 are included. The plane is a first reference plane H1, a plane that includes the central axis of the airtight container 1 and is perpendicular to the first reference plane H1 is a second reference plane H2, and the compressor is arranged on the first reference plane H1 and the second reference plane H2. Of the four segments Q1, Q2, Q3, and Q4 obtained by dividing, the inflow portion 42 of the communication path 39 is provided in the first quadrant segment Q1 and the second quadrant segment Q2, and is located opposite to the first quadrant segment Q1. When the segment adjacent to the second quadrant segment Q2 is defined as the third quadrant segment Q3, and the segment opposite to the second quadrant segment Q2 and adjacent to the first quadrant segment Q1 is defined as the fourth quadrant segment Q4, the refrigerant in the intermediate pressure state is defined as the fourth quadrant segment Q4. The center of the injection pipe 95 for injecting into the compression chamber is provided in the third quadrant segment Q3 or the fourth quadrant segment Q4. In this example, it is provided on a line dividing the third quadrant segment Q3 and the fourth quadrant segment Q4.

[1-2. motion]
The operation according to this embodiment will be explained below.

In the scroll compressor of this embodiment, the relatively high temperature refrigerant gas discharged from the discharge port 17 flows toward the inflow portion 42 of the communication passage 39 provided on the opposite side to the side where the injection pipe 95 is provided. The liquid flows through the communication path 39 without passing through the vicinity of the injection pipe 95 and flows into the second discharge space 38 .

Thereby, heating of the refrigerant gas in the injection chamber by the relatively high temperature refrigerant gas discharged from the discharge port 17 is suppressed, the injection rate can be increased, and a highly efficient scroll compressor can be achieved.

[1-3. Effects, etc.]
As described above, the scroll compressor of the present disclosure includes a compression mechanism section, an injection pipe for injecting refrigerant at an intermediate pressure into the compression chamber of the compression mechanism, and the compression mechanism in a closed container whose interior becomes a discharge atmosphere. A first discharge space from which refrigerant gas compressed by the refrigerant gas is discharged, a second discharge space, and one or more communication passages that communicate the first discharge space and the second discharge space, and an inflow portion of the communication passage. A plane including the center of the airtight container and the central axis of the sealed container is a first reference plane, a plane including the central axis and perpendicular to the first reference plane is a second reference plane, and the compressor is defined as the first reference plane and the second reference plane. Among the four segments obtained by dividing the plane, a communication path is provided in the first quadrant segment and the second quadrant segment, and the segment opposite to the first quadrant segment and adjacent to the second quadrant segment is designated as the third quadrant segment. , when the segment opposite to the second quadrant segment and adjacent to the first quadrant segment is defined as the fourth quadrant segment, the center of the injection pipe that injects the refrigerant in the intermediate pressure state into the compression chamber is defined as the third quadrant segment or the fourth quadrant segment. It is provided in four quadrant segments.

This allows the relatively high temperature refrigerant discharged from the discharge port to flow without passing through the vicinity of the injection pipe, thereby preventing the injection pipe from being directly heated. Therefore, heating of the refrigerant in the injection pipe can be suppressed, the injection rate can be increased, a highly efficient scroll compressor can be obtained, and the heating and cooling capacity of a refrigeration cycle device using this can be increased.

(Embodiment 2)
[2-1. composition]
FIG. 5 is a longitudinal cross-sectional view of a compressor according to Embodiment 2 of the present disclosure.

The compressor of the second embodiment has a configuration in which the discharge pipe 4 is directly drawn out from the discharge space above the compression mechanism section 10 (hereinafter, this discharge space is referred to as a second discharge space 38). Therefore, a muffler 19 that covers the discharge port 17 and the reed valve 18 is provided on the surface of the fixed scroll 12 on the second discharge space 38 side. The muffler 19 isolates a discharge space in which refrigerant gas is discharged from the discharge port 17 (hereinafter, this discharge space is referred to as a first discharge space 37) from a second discharge space 38, and separates this first discharge space 37 from a fixed scroll. It is communicated with the second discharge space 38 through an inlet 42, a communication path 39, and an outlet 43 provided in the second discharge space 12.

Therefore, the refrigerant gas discharged from the discharge port 17 into the first discharge space 37 by pushing open the reed valve 18 passes from the inlet 42 of the communication passage 39 through the communication passage 39, and from the outlet 43 of the communication passage 39 to the first discharge space 37. 2 discharge space 38 , and is discharged to the outside of the closed container 1 through the discharge pipe 4 .

Here, in the compressor according to the present embodiment, as shown in FIG. It is made larger than the distance G.

In this embodiment, the communication passage 39 has a function of separating oil by swirling. The configuration will also be explained below.

FIG. 7 is an enlarged sectional view of a main part of the compression mechanism section in FIG. 5, and 40 is an oil separation mechanism section.

The oil separation mechanism section 40 includes a cylindrical space 41 that swirls refrigerant gas, an inflow section 42 that communicates between the first discharge space 37 in the muffler 19 and the cylindrical space 41, and an inflow section 42 that communicates between the cylindrical space 41 and another cylindrical space 41. The discharge port 43 communicates with the two discharge spaces 38, and the discharge port 44 communicates the cylindrical space 41 with the motor section 20 side space.

The cylindrical space 41 is composed of a first cylindrical space 41a formed in the fixed scroll 12 and a second cylindrical space 41b formed in the main bearing member, and constitutes the communication path 39.

The inflow part 42 communicates with the first cylindrical space 41a, and preferably the opening of the inflow part 42 is formed on the inner peripheral surface of the upper end of the first cylindrical space 41a. The inflow section 42 causes the refrigerant gas discharged from the compression mechanism section 10 to flow into the cylindrical space 41 from the first discharge space 37 in the muffler 19 . The inflow portion 42 opens in a tangential direction to the cylindrical space 41 .

The outlet 43 is formed on the upper end side of the cylindrical space 41, and is formed at least closer to the second discharge space 38 than the inlet 42. It is preferable that the outlet 43 is formed in the upper end surface of the first cylindrical space 41a. The outlet 43 then delivers the refrigerant gas from which oil has been separated from the cylindrical space 41 to the second discharge space 38 .

The discharge port 44 is formed on the lower end side of the cylindrical space 41, and is formed at least closer to the motor section 20 than the inflow section 42. It is preferable that the discharge port 44 is formed at the lower end surface of the second cylindrical space 41b. Then, the discharge port 44 discharges the separated oil and part of the refrigerant gas from the cylindrical space 41 to the space on the side of the electric motor section 20 .

Here, the cross-sectional area A of the opening of the outlet 43 is preferably smaller than the cross-sectional area C of the cylindrical space 41 and larger than the cross-sectional area B of the opening of the discharge port 44. If the cross-sectional area A of the opening of the outlet 43 is the same as the cross-sectional area C of the cylindrical space 41, the swirling flow of refrigerant gas will not be guided in the direction of the outlet 44 and will be blown out from the outlet 43. . Furthermore, if the cross-sectional area B of the opening of the discharge port 44 is the same as the cross-sectional area C of the cylindrical space 41, a swirling flow of refrigerant gas will blow out from the discharge port 44.

Further, by making the cross-sectional area A of the opening of the outlet 43 larger than the cross-sectional area B of the opening of the outlet 44, the flow path resistance at the outlet 43 is reduced. Thereby, the refrigerant gas flows more easily into the outlet 43 than the outlet 44. As an example, A/B is set to about 9.

In this embodiment, the first cylindrical space 41a is formed by drilling holes in the outer periphery of the fixed scroll 12, and the second cylindrical space 41a is formed by drilling holes in the outer periphery of the main bearing member 11. 41b. Furthermore, a groove that opens in the tangential direction to the first cylindrical space 41a is formed on the end surface of the fixed scroll 12 on the opposite wrap side, and a part of the groove on the first cylindrical space 41a side is formed with a muffler 19. By covering it, an inflow portion 42 is formed. Further, the outlet port 43 is constituted by a hole formed in the muffler 19, and this hole is arranged at the opening of the first cylindrical space 41a. Further, the discharge port 44 is constituted by a hole formed in the bearing cover 45, and this hole is connected to the second cylindrical space 41b.
It is placed at the opening of the

[2-2. motion]
The operation according to this embodiment will be explained below.

In the scroll compressor of this embodiment, relatively high temperature refrigerant is discharged from the discharge port 17 into the first discharge space 37 defined by the muffler. Then, it is discharged from the inflow portion 42 of the communication passage 39 to the second discharge space 38 via the communication passage 39, and flows from the discharge pipe 4 to the outside of the closed container 1. Here, since the discharge pipe 4 is closer to the inflow part 42 of the communication passage 39 than the injection pipe 95, the relatively high temperature refrigerant flows from the discharge pipe 4 to the outside of the closed container 1 without passing through the vicinity of the injection pipe 95. It starts to flow.

Thereby, heating of the refrigerant in the injection pipe 95 can be suppressed, the injection rate can be increased, and a highly efficient scroll compressor can be achieved.

Next, the operation of the oil separation mechanism section 40 according to this embodiment will be explained.

The refrigerant gas discharged into the first discharge space 37 in the muffler 19 is guided into the cylindrical space 41 through an inflow portion 42 formed in the fixed scroll 12 . Since the inflow part 42 is open in the tangential direction with respect to the cylindrical space 41, the refrigerant gas sent out from the inflow part 42 flows along the inner wall surface of the cylindrical space 41, and the refrigerant gas flows along the inner wall surface of the cylindrical space 41. A swirling flow occurs on the surface. This swirling flow becomes a flow toward the discharge port 44.

The refrigerant gas contains oil supplied to the compression mechanism 10, and while the refrigerant gas is swirling, the oil with high specific gravity adheres to the inner wall of the cylindrical space 41 due to centrifugal force, and is mixed with the refrigerant gas. To separate.

The swirling flow generated on the inner peripheral surface of the cylindrical space 41 turns around after reaching the outlet 44 or near the outlet 44 and turns into an upward flow passing through the center of the cylindrical space 41 .

The refrigerant gas from which oil has been separated by centrifugal force reaches the outlet 43 due to an upward flow, and is delivered to the second discharge space 38 . The refrigerant gas delivered to the second discharge space 38 is delivered to the outside of the closed container 1 from the discharge pipe 4 provided in the second discharge space 38, and is supplied to the refrigeration cycle.

Further, the oil separated in the cylindrical space 41 is sent out to the space on the side of the motor section 20 from the discharge port 44 along with a small amount of refrigerant gas. The oil sent to the space on the side of the electric motor section 20 reaches the oil storage section 2 through the wall of the closed container 1 and the communication path of the electric motor section 20 due to its own weight.

The refrigerant gas sent to the space on the side of the electric motor section 20 passes through the gap in the compression mechanism section 10, reaches the second discharge space, and is sent out from the discharge pipe 4 to the outside of the closed container 1.

According to the present embodiment, most of the high temperature and high pressure refrigerant gas compressed by the compression mechanism section 10 and sent out from the oil separation mechanism section 40 is guided to the second discharge space 38 and discharged from the discharge pipe 4. Ru. Therefore, most of the high-temperature, high-pressure refrigerant gas does not pass through the motor section 20, so the motor section 20 is not heated by the refrigerant gas, and the efficiency of the motor section 20 can be improved.

Furthermore, according to the present embodiment, by guiding most of the high-temperature, high-pressure refrigerant gas to the second discharge space 38, heating of the compression mechanism section 10 in contact with the space on the side of the motor section 20 can be suppressed. It is possible to suppress heating of the refrigerant gas and obtain high volumetric efficiency within the compression chamber.

Further, according to the present embodiment, by forming the cylindrical space 41 in the fixed scroll 12 and the main bearing member 11, the path through which the refrigerant gas flows from the discharge port 17 to the discharge pipe 4 can be configured to be short, and the passage can be airtight. The container 1 can be made smaller.

[2-3. Effects, etc.]
As described above, the scroll compressor of the present disclosure includes a compression mechanism section, an injection pipe for injecting refrigerant at an intermediate pressure into the compression chamber of the compression mechanism, and the compression mechanism in a closed container whose interior becomes a discharge atmosphere. a first discharge space formed by a muffler that covers a discharge port from which refrigerant gas compressed in the section is discharged; a second discharge space provided with a discharge pipe that guides the refrigerant gas to the outside; the first discharge space and the second discharge space. one or more communicating passages are provided, and a plane including the muffler, the center of the outlet of the communicating passage, and the central axis of the sealed container is a first reference plane, and a plane including the central axis and the first reference plane is provided. A vertical plane is defined as a second reference plane, and among the four segments obtained by dividing the compressor between the first reference plane and the second reference plane, the inflow portion of the communication passage is defined as the first quadrant segment and the second reference plane. The segment provided in the second quadrant segment, opposite the first quadrant segment and adjacent to the second quadrant segment, was defined as the third quadrant segment, and the segment opposite the second quadrant segment and adjacent to the first quadrant segment was defined as the fourth quadrant segment. When the center of the injection pipe that injects the refrigerant in the intermediate pressure state into the compression chamber is provided in the third quadrant segment or the fourth quadrant segment, and the distance between the center of the injection pipe and the outlet of the communication path is This distance is greater than the distance between the pipe and the outlet of the communication path.

With this configuration, relatively high-temperature refrigerant is discharged from the muffler, which is the first discharge space, through the communication passage, from the outlet of the communication passage to the second discharge space, and is then discharged to a position closer to the injection pipe. Since the refrigerant flows from the discharge pipe to the outside of the sealed container, heating of the refrigerant in the injection pipe by high-temperature refrigerant can be suppressed, increasing the injection rate and creating a highly efficient scroll compressor, increasing the heating and cooling capacity of the refrigeration cycle equipment using this. can be realized.

Moreover, if an oil separation mechanism is provided in the communication path as in this embodiment, oil separation can be performed efficiently in a space-saving manner. Even if oil that is compatible with the refrigerant gas is used, the oil can be separated from the refrigerant gas that is compatible with the oil and discharged during the cycle, making it possible to further improve the efficiency of the compressor.

Furthermore, if the oil separation mechanism is a swirling separation mechanism as in this embodiment, the oil that is compatible with the refrigerant gas can be efficiently separated by the centrifugal force of the refrigerant, making oil separation more space-saving and efficient. can be done.
(Other embodiments)
As mentioned above, Embodiments 1 and 2 have been described as examples of the technology disclosed in this application, but the following configurations can also be added. For example, the injection pipe 95 is inserted and fixed into the fixed scroll 12, and the fixed scroll 12 is made of aluminum material.

According to this configuration, even if the fixed scroll 12 is formed of an aluminum material with high thermal conductivity, heating of the refrigerant in the injection can be suppressed by the configuration described in the first and second embodiments. Then, while suppressing heating in the vicinity of the injection pipe 95, heat conduction from the injection pipe 95 to the fixed scroll 12 can be suppressed, and heating of the refrigerant gas in the injection pipe 95 and the refrigerant in the compression chamber 15 can also be suppressed, so that the injection rate can be reduced. can be further improved, achieving high efficiency and an increase in heating and cooling capacity. Moreover, the weight of the fixed scroll 12 can also be reduced. Further, the suction pipe 3 that guides the refrigerant gas to the compression mechanism section 10 is provided in the third quadrant segment Q3 and/or the fourth quadrant segment Q4 described in the first embodiment.

As a result, the relatively high temperature refrigerant gas discharged from the discharge port 17 can flow without passing through the vicinity of the suction pipe 3, and the relatively low temperature refrigerant gas in the suction pipe 3 can be heated by suction. High efficiency can be achieved by suppressing and improving volumetric efficiency.

Furthermore, R32, carbon dioxide, or a refrigerant having a double bond between carbons can be used as the refrigerant of the compressor of the present disclosure.

Note that the above-described embodiments are for illustrating the technology of the present disclosure, and therefore various changes, substitutions, additions, omissions, etc. can be made within the scope of the claims or equivalents thereof.

The scroll compressor of the present disclosure can be applied to a scroll compressor having an injection function, and is useful for a refrigeration cycle device such as a hot water heating device, an air conditioner, a water heater, or a refrigerator.

1 Sealed container 2 Oil storage section 3 Suction pipe 4 Discharge pipe 10 Compression mechanism section 11 Main bearing member 12 Fixed scroll 12d Wrap tip 13 Orbiting scroll 13d Wrap tip 14 Autorotation restraint mechanism 15 Compression chamber 16 Suction chamber 17 Discharge port 19 Muffler 20 Electric motor Part 37 First discharge space 38 Second discharge space 39 Communication passage 40 Oil separation mechanism part 41 Cylindrical space 42 Inflow part 43 Outlet port 44 Discharge port 51 Center line of communication passage 54 Injection port 95 Injection pipe H1 First reference plane H2 2nd reference plane Q1 1st quadrant segment Q2 2nd quadrant segment Q3 3rd quadrant segment Q4 4th quadrant segment

Claims (6)

A closed container with a discharge atmosphere inside,
a compression mechanism provided in the airtight container;
an electric motor unit for driving the compression mechanism unit;
an injection pipe for injecting refrigerant at an intermediate pressure into the compression chamber of the compression mechanism;
a first discharge space in which refrigerant gas compressed by the compression mechanism is discharged from a discharge port provided near the center of the closed container;
a second discharge space provided with a discharge pipe that guides the refrigerant gas to the outside of the sealed container;
Equipped with
One or more communication passages communicating between the first discharge space and the second discharge space are provided at an eccentric position with respect to the center of the closed container,
A plane including the center of the inflow portion of the communication path and the central axis of the closed container is a first reference plane, a plane including the central axis and perpendicular to the first reference plane is a second reference plane, and Among the four segments obtained by dividing the compressor by the first reference plane and the second reference plane, the inflow portion of the communication path is provided in the first quadrant segment and the second quadrant segment,
The segment opposite to the first quadrant segment and adjacent to the second quadrant segment was defined as a third quadrant segment, and the segment opposite to the second quadrant segment and adjacent to the first quadrant segment was defined as a fourth quadrant segment. In this case, the center of the injection pipe for injecting the refrigerant in the intermediate pressure state into the compression chamber is not located in the first quadrant segment or the second quadrant segment, but in the third quadrant segment or the fourth quadrant segment. A scroll compressor characterized by being installed in. A closed container with a discharge atmosphere inside,
a compression mechanism provided in the airtight container;
an electric motor unit for driving the compression mechanism unit;
an injection pipe for injecting refrigerant at an intermediate pressure into the compression chamber of the compression mechanism;
a first discharge space in which refrigerant gas compressed by the compression mechanism is discharged from a discharge port provided near the center of the closed container;
a muffler that covers the discharge port;
a second discharge space provided with a discharge pipe that guides the refrigerant gas to the outside of the sealed container;
Equipped with
The muffler isolates the first discharge space from the second discharge space,
One or more communication passages communicating between the first discharge space and the second discharge space are provided at an eccentric position with respect to the center of the closed container,
The communication path is formed of a cylindrical space that swirls and separates oil,
an inflow port that communicates between the first discharge space and the communication path; a discharge port that communicates the communication path and the second discharge space; and an exhaust port that communicates the communication path and the space on the motor side. The oil separation mechanism is configured by
A plane including the center of the outlet and the central axis of the sealed container is a first reference plane, a plane including the central axis and perpendicular to the first reference plane is a second reference plane, and the first reference plane is And among the four segments obtained by dividing the compressor at the second reference plane, the inflow portion of the communication path is provided in a first quadrant segment and a second quadrant segment,
The segment opposite to the first quadrant segment and adjacent to the second quadrant segment was defined as a third quadrant segment, and the segment opposite to the second quadrant segment and adjacent to the first quadrant segment was defined as a fourth quadrant segment. When, the center of the injection pipe for injecting the refrigerant in the intermediate pressure state into the compression chamber is located in the third quadrant segment or the fourth quadrant segment,
A scroll compressor characterized in that the distance between the center of the injection pipe and the outlet port is greater than the distance between the discharge pipe and the outlet port. 3. The scroll compressor according to claim 2, wherein an oil separation mechanism is provided in the communication path. 4. The scroll compressor according to claim 3, wherein the oil separation mechanism is a swirl separation mechanism. 5. The scroll compressor according to claim 1, wherein suction pipes for guiding the refrigerant gas to the compression mechanism are provided in the third quadrant segment and the fourth quadrant segment. 6. The scroll compressor according to claim 1, wherein the injection pipe is inserted into a fixed scroll, and the fixed scroll is made of aluminum material.

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