JP7536174B2 - Scroll compressor and refrigeration cycle device - Google Patents

Description

The present disclosure relates to a scroll compressor with an injection port and a refrigeration cycle device.

Conventionally, there is a scroll compressor that supplies injection refrigerant to a compression chamber formed by combining a fixed scroll of a fixed scroll and an oscillating scroll of an oscillating scroll (see, for example, Patent Document 1). In the scroll compressor of Patent Document 1, injection is performed only in the first compression chamber out of the first compression chamber formed by the outward surface of the oscillating scroll and the inward surface of the fixed scroll, and the second compression chamber formed by the inward surface of the oscillating scroll and the outward surface of the fixed scroll.

International Publication No. 2017/141342

In the scroll compressor of Patent Document 1, injection is performed only in the first compression chamber, and not in the second compression chamber. This configuration has the problem that it is not possible to obtain a large injection flow rate.

The present disclosure has been made in consideration of these points, and aims to provide a scroll compressor and refrigeration cycle device that can inject into both the first compression chamber and the second compression chamber, thereby obtaining a large injection flow rate.

The scroll compressor of the present disclosure includes a fixed scroll having a fixed base plate and a fixed scroll provided on the fixed base plate, and an oscillating scroll having a oscillating scroll provided on the oscillating base plate, and is provided with a compression mechanism that compresses a refrigerant in a compression chamber formed by combining the fixed scroll and the oscillating scroll by revolving the oscillating scroll relative to the fixed scroll, and the compression mechanism has an asymmetrical scroll structure in which the spiral length of the fixed scroll of the fixed scroll is different from the spiral length of the oscillating scroll of the oscillating scroll, and the fixed base plate includes an injection port that supplies an injection refrigerant to the compression chamber. an injection port is formed in the compression chamber, and the compression chamber has a first compression chamber formed by the outward surface of the oscillating scroll and the inward surface of the fixed scroll, and a second compression chamber formed by the inward surface of the oscillating scroll and the outward surface of the fixed scroll; the injection port is formed from a position between the inward surface of the fixed scroll and the tooth thickness of the oscillating scroll to a position between the outward surface of the fixed scroll and the tooth thickness of the oscillating scroll, so as to communicate with the first compression chamber and the second compression chamber in different ranges of the revolution angle of the oscillating scroll, and is formed at a position communicating with the second compression chamber when the suction of refrigerant into the second compression chamber is completed and the compression process is started.

According to the scroll compressor of the present disclosure, the injection port is formed between the tooth thickness of the oscillating scroll from the inward surface of the fixed scroll to the tooth thickness of the oscillating scroll from the outward surface of the fixed scroll. This allows injection into both the first and second compression chambers. The injection port is also formed at a position that communicates with the second compression chamber when the refrigerant intake is completed and the compression process is started. This allows injection into both the first and second compression chambers, and in the asymmetric scroll structure, injection is first performed into the second compression chamber, which has a lower pressure than the first compression chamber. As a result, a large injection flow rate can be obtained.

1 is a schematic vertical cross-sectional view showing a scroll compressor according to a first embodiment. FIG. 2 is a partially enlarged view of FIG. 3 is an explanatory diagram of a flow path formed between a guide frame and a sealed container of the scroll compressor according to the first embodiment. FIG. 2 is a schematic cross-sectional view of a compression mechanism in the scroll compressor according to the first embodiment. FIG. 4 is a compression process diagram showing the operation during rotation of the orbiting scroll in the scroll compressor according to the first embodiment. FIG. FIG. 4 is an explanatory diagram showing the operation of each compression chamber (refrigerant injection and air extraction from an air extraction hole) according to the revolution angle during the compression process of the scroll compressor according to the first embodiment. 1 is a schematic configuration diagram of a refrigeration cycle device according to a first embodiment.

Embodiment 1.
Fig. 1 is a schematic vertical cross-sectional view showing a scroll compressor according to embodiment 1. Fig. 2 is a partially enlarged view of Fig. 1. Fig. 3 is an explanatory diagram of a flow path formed between a guide frame and a sealed container of the scroll compressor according to embodiment 1. The configuration of scroll compressor 100 will be described below with reference to Figs. 1 to 3.

The scroll compressor 100 is a so-called vertical scroll compressor, and the Z direction, which is the vertical direction in FIG. 1, is the axial direction of the scroll compressor 100. The scroll compressor 100 compresses and discharges a refrigerant, which is a working gas. For example, R407C refrigerant, R410A refrigerant, or R32 refrigerant is used as the refrigerant. The scroll compressor 100 includes a sealed container 1, a compression mechanism 2 including a fixed scroll 4 and an orbiting scroll 3, an electric motor 16, and a drive shaft 19. The scroll compressor 100 has a configuration in which the compression mechanism 2, the electric motor 16, and the drive shaft 19 are housed in the sealed container 1. The scroll compressor 100 is one of the components of a refrigeration cycle used in various industrial machines, such as refrigerators, freezers, air conditioners, refrigeration devices, or water heaters. As will be described later, the gas refrigerant compressed and pressurized by the compression mechanism 2 is discharged into the high-pressure gas atmosphere 6 in the sealed container 1. This gas refrigerant circulates through a refrigeration cycle in which the scroll compressor 100 is incorporated.

The sealed container 1 is formed, for example, in a cylindrical shape and has pressure resistance. A suction pipe 7 for taking in the refrigerant into the sealed container 1 is connected to the side of the sealed container 1. A suction check valve 9 and a spring 10 are arranged inside the suction pipe 7. The suction check valve 9 is biased by the spring 10 in a direction to close the suction pipe 7, preventing the refrigerant from flowing back. In addition, a discharge pipe 11 for discharging the compressed refrigerant from the sealed container 1 to the outside and an injection pipe 50 for supplying the injection refrigerant from the outside to the compression mechanism 2 are connected to the other side of the sealed container 1. The arrows in the suction pipe 7 and the discharge pipe 11 indicate the direction in which the refrigerant flows.

The sealed container 1 has a high-pressure gas atmosphere 6 therein. The bottom of the sealed container 1 is an oil reservoir space 5 for storing refrigeration oil (hereinafter, oil). The oil reservoir space 5 is in the high-pressure gas atmosphere 6, and is a space located below the subframe 37 that supports the lower end of the drive shaft 19, below the auxiliary bearing 27 provided on the subframe 37, or below the end of the drive shaft 19, etc.

The compression mechanism 2 compresses the refrigerant sucked into the sealed container 1 from the suction pipe 7, and has a swing scroll 3 and a fixed scroll 4. As shown in FIG. 1, the fixed scroll 4 is arranged on the upper side, and the swing scroll 3 is arranged on the lower side. The fixed scroll 4 has a fixed base plate 4b and a fixed spiral body 4a formed on the fixed base plate 4b. The swing scroll 3 has a swing base plate 3b and a swing spiral body 3a formed on the swing base plate 3b.

The fixed scroll 4 and the oscillating scroll 3 are arranged so that the fixed scroll 4a and the oscillating scroll 3a face each other. The fixed scroll 4a and the oscillating scroll 3a are combined in the opposite direction to form a compression chamber 2b between the fixed scroll 4a and the oscillating scroll 3a. The fixed scroll 4a of the fixed scroll 4 and the outer peripheral space of the base plate outside the oscillating scroll 3 (hereinafter referred to as the suction side space 8) are low pressure spaces of the intake gas atmosphere at the suction pressure.

The fixed scroll 4 is fixed by bolts (not shown) or the like to a guide frame 30 that is fixedly supported by the sealed container 1. A pair of fixed side Oldham ring grooves 15a are formed in a straight line on the outer periphery of the fixed scroll 4. A pair of fixed side keys 42a of an Oldham ring 40 are installed in the fixed side Oldham ring groove 15a so as to be able to slide back and forth.

A cylindrical boss portion 3c is formed on the other surface of the oscillating base plate 3b of the oscillating scroll 3, opposite to the surface on which the oscillating spiral body 3a is formed. An oscillating bearing 26 is provided on the inner surface of the boss portion 3c. The oscillating shaft 21 of the drive shaft 19 is inserted into the oscillating bearing 26, and the oscillating scroll 3 revolves around the fixed scroll 4 as the oscillating shaft 21 rotates.

The compliant frame 31 is disposed in contact with the other surface of the oscillating base plate 3b of the oscillating scroll 3. A thrust surface 3d that can slide against the thrust surface 33 of the compliant frame 31 is formed on the other surface of the oscillating base plate 3b of the oscillating scroll 3. In addition, a pair of oscillating side Oldham ring grooves 15b are formed in a straight line on the outer periphery of the oscillating scroll 3. The oscillating side Oldham ring groove 15b has a phase difference of about 90 degrees with the fixed side Oldham ring groove 15a, and a pair of oscillating side keys 42b of the Oldham ring 40 are installed so as to be freely reciprocatingly slidable. The oscillating side keys 42b reciprocate on the reciprocating sliding surface 41 formed on the outer periphery of the thrust surface 33 of the compliant frame 31.

The oscillating bed plate 3b has an air bleed hole 3e formed through the oscillating bed plate 3b from one surface on which the oscillating scroll 3a is provided to the other surface. The air bleed hole 3e has an air bleed inlet 3ei formed on the upper surface, which is one surface of the oscillating bed plate 3b, and an air bleed outlet 3eo formed on the lower surface, which is the other surface of the oscillating bed plate 3b, as shown in FIG. 2. The air bleed inlet 3ei opens into the compression chamber 2b. The air bleed outlet 3eo intermittently communicates with the gas introduction passage 14 provided in the compliant frame 31. By intermittently communicating the air bleed outlet 3eo with the gas introduction passage 14, the intermediate pressure gas refrigerant in the middle of compression in the compression chamber 2b is led to the intermediate pressure space 32b through the air bleed hole 3e and the gas introduction passage 14. The intermediate pressure refers to a pressure higher than the suction pressure and lower than the discharge pressure. In this manner, the bleed hole 3e bleeds air intermittently from the compression chamber 2b in the middle of compression to the intermediate pressure space 32b as the orbiting scroll 3 revolves.

Within the sealed container 1, a guide frame 30 is disposed above the electric motor 16, and a subframe 37 that holds the drive shaft 19 is disposed below the electric motor 16. The guide frame 30 and the subframe 37 are fixed to the sealed container 1. A compliant frame 31 is housed on the inner periphery of the guide frame 30.

Between the outer peripheral surface of the guide frame 30 and the inner wall of the sealed container 1, a flow path 30c is formed through which the high-pressure gas refrigerant flows out from the discharge port 12 formed in the fixed scroll 4 (see Figures 1 and 3). The high-pressure gas refrigerant that flows out from the discharge port 12 passes through the flow path 30c and is guided below the compression mechanism 2. By guiding the high-pressure gas refrigerant below the compression mechanism 2, a high-pressure gas atmosphere 6 is formed in the sealed container 1.

An upper mating cylindrical surface 30a is formed on the fixed scroll 4 side (upper side in FIG. 1) of the inner circumferential surface of the guide frame 30. This upper mating cylindrical surface 30a is engaged with an upper mating cylindrical surface 35a formed on the outer circumferential surface of the compliant frame 31. Meanwhile, a lower mating cylindrical surface 30b is formed on the motor 16 side (lower side in FIG. 1) of the inner circumferential surface of the guide frame 30. This lower mating cylindrical surface 30b is engaged with a lower mating cylindrical surface 35b formed on the outer circumferential surface of the compliant frame 31.

An upper annular seal member 36a and a lower annular seal member 36b are arranged at two locations on the outer peripheral surface of the compliant frame 31. The upper annular seal member 36a and the lower annular seal member 36b separate the inner surface of the guide frame 30 from the outer surface of the compliant frame 31. The space partitioned by the upper annular seal member 36a and the lower annular seal member 36b forms an intermediate pressure space 32b. Note that the upper annular seal member 36a and the lower annular seal member 36b are arranged at two locations on the outer peripheral surface of the compliant frame 31 in FIG. 1, but the positions of these seal members are not limited to the example in FIG. 1. These seal members may be arranged at two locations on the inner peripheral surface of the guide frame 30, for example.

The compliant frame 31 supports the orbiting scroll 3 in the axial direction. The compliant frame 31 has a thrust surface 33 that axially supports the thrust force acting on the orbiting scroll 3 in the axial direction. The compliant frame 31 has a gas introduction passage 14 that communicates between the thrust surface 33 and the intermediate pressure space 32b. The gas introduction passage 14 communicates with the bleed hole 3e in response to the revolution of the orbiting scroll 3. The gas introduction passage 14 communicates with the bleed hole 3e, so that intermediate-pressure refrigerant is introduced from the compression chamber 2b during compression to the intermediate pressure space 32b. On the other hand, the bleed hole 3e is opposed to the thrust surface 33 of the compliant frame 31 and blocked in response to the revolution of the orbiting scroll 3, so that the introduction of intermediate-pressure refrigerant to the intermediate pressure space 32b is stopped. In this manner, the bleed hole 3e is repeatedly connected to the gas introduction passage 14 and closed by the thrust surface 33, thereby intermittently introducing intermediate-pressure gas refrigerant from the compression chamber 2b to the intermediate pressure space 32b. The intermediate pressure space 32b is maintained at intermediate pressure by the intermittent introduction of the intermediate-pressure gas refrigerant.

The compliant frame 31 supports the orbiting scroll 3 in the axial direction by the intermediate pressure in the intermediate pressure space 32b. The intermediate pressure in the intermediate pressure space 32b acts on the compliant frame 31. The high pressure from the high-pressure gas atmosphere 6 acts on the lower end surface 34 of the compliant frame. The compliant frame 31 floats in the axial direction by these pressures acting on the compliant frame 31, and has the effect of pushing up the orbiting scroll 3 in the axial direction.

Between the outside of the boss portion 3c of the swing scroll 3 and the compliant frame 31, an intermediate pressure boss outer space 38 is provided. The compliant frame 31 is also provided with an intermediate pressure adjustment valve space 39d. The intermediate pressure adjustment valve space 39d contains an intermediate pressure adjustment valve 39a, which adjusts the pressure in the boss outer space 38, an intermediate pressure adjustment valve retainer 39b, and an intermediate pressure adjustment spring 39c. The intermediate pressure adjustment spring 39c is shortened from its natural length and stored in the intermediate pressure adjustment valve space 39d.

Furthermore, the compliant frame 31 is provided with a through passage 39e that communicates with the boss outer space 38 and the intermediate pressure regulating valve space 39d. In addition, a compliant frame upper space 32a that communicates with the intermediate pressure regulating valve space 39d is provided between the outer peripheral surface of the compliant frame 31 on the fixed scroll side (upper side in FIG. 1) of the intermediate pressure regulating valve space 39d and the inner peripheral surface of the guide frame 30. The compliant frame upper space 32a is formed so as to communicate with the space inside the Oldham ring 40. Therefore, the boss outer space 38 and the space inside the Oldham ring 40 are communicated via the through passage 39e, the intermediate pressure regulating valve space 39d, and the compliant frame upper space 32a.

The electric motor 16 drives the drive shaft 19 to rotate. The electric motor 16 is configured so that the operating frequency can be controlled, for example, by an inverter device. The electric motor 16 has an electric motor rotor 16a and an electric motor stator 16b, and generates rotational force at a variable rotation speed. The electric motor rotor 16a is fixed to the drive shaft 19 by shrink fitting or the like. The electric motor rotor 16a has a plurality of through-flow passages (not shown) that penetrate in the axial direction and are formed symmetrically or point-symmetrically with respect to the axis.

The motor stator 16b is connected to a glass terminal (not shown) fixed to the guide frame 30 via a lead wire (not shown) to obtain power from the outside. The motor stator 16b is fixed to the sealed container 1 by shrink fitting or the like, and a through flow passage (not shown) is formed by a notch on the outer periphery of the motor stator 16b. The drive shaft 19 and the motor rotor 16a rotate relative to the motor stator 16b when power is supplied to the motor stator 16b. In addition, in order to balance the entire rotating system in the scroll compressor 100, a balance weight 18a is fixed to the motor rotor 16a, and a balance weight 18b is fixed to the drive shaft 19.

The drive shaft 19 has a swing shaft 21 that constitutes the upper part of the drive shaft 19, a main shaft 20 that constitutes the middle part of the drive shaft 19, and a sub-shaft 22 that constitutes the lower part of the drive shaft 19. The main shaft 20 is rotatably supported by a main bearing 25 provided on the inner peripheral surface of the compliant frame 31. The sub-shaft 22 is rotatably supported by a sub-bearing 27 provided on the inner peripheral surface of the sub-frame 37. The lower end surface of the sub-shaft 22 has its own weight supported by a thrust bearing 28. The thrust bearing 28 is fixed to a holder 29, which is fixed to the sub-frame 37. The main bearing 25 and the sub-bearing 27 have a cylindrical structure and have a bearing structure consisting of a sliding bearing such as a copper-lead alloy, and rotatably support the drive shaft 19.

The drive shaft 19 transmits the rotational force generated by the electric motor 16 to the compression mechanism 2. Inside the drive shaft 19, an oil supply passage 23 extending axially from the end of the drive shaft 19 and supply passages 24a and 24b extending radially from the oil supply passage 23 are formed. The supply passage 24a is formed in the countershaft 22, and the supply passage 24b is formed in the main shaft 20. Oil sucked up from the oil reservoir space 5 passes through the oil supply passage 23, the supply passages 24a and 24b, and is supplied to each sliding portion such as the main bearing 25, the oscillating bearing 26, and the sub-bearing 27. That is, the oil supply passage 23 opens at the axial upper end of the drive shaft 19 and supplies oil to the oscillating bearing 26. The supply passage 24b opens at a position covered by the main bearing 25 and supplies oil to the main bearing 25. The supply passage 24a of the subshaft 22 opens at a position covered by the subshaft 22 and supplies oil to the subshaft 22. In FIG. 1, arrows in the oil supply passage 23 and the supply passages 24a and 24b indicate the flow of oil.

Next, an injection mechanism for supplying injection refrigerant to the compression mechanism 2 will be described.
An injection inlet passage 4d and an injection port 4e communicating with the injection inlet passage 4d are formed in the fixed base plate 4b of the fixed scroll 4. An end of an injection pipe 50 penetrating the sealed container 1 is connected to the injection inlet passage 4d. The injection port 4e opens on one surface of the fixed base plate 4b on which the fixed scroll 4a is formed. The injection port 4e supplies the injection refrigerant supplied from the injection pipe 50 via the injection inlet passage 4d to the compression chamber 2b.

<Operation of the scroll compressor 100>
(At startup and when injection is OFF)
The operation of the scroll compressor 100 at startup and when injection is OFF will be described. When low-pressure (suction pressure) gas refrigerant is supplied from the suction piping 7 toward the suction check valve 9, the gas refrigerant overcomes the spring force of the spring 10 and pushes the suction check valve 9 down to its valve stop (not shown). This opens the suction check valve 9, and the gas refrigerant flows into the suction side space 8 in the sealed container 1.

On the other hand, the drive shaft 19 starts to rotate when power is supplied to the electric motor 16 from the outside. The rotation of the drive shaft 19 rotates the oscillating shaft 21, and the oscillating scroll 3 performs an oscillating motion (revolutionary motion). At this time, gas refrigerant is sucked into the compression chamber 2b formed between the oscillating scroll 3 and the fixed scroll 4.

The gas refrigerant is eventually boosted from low pressure to high pressure due to the geometric volume change of the compression chamber 2b. The gas refrigerant that has been boosted to high pressure is then discharged from the discharge port 12, passes through the flow path 30c, and is guided below the guide frame 30. The gas refrigerant guided below the guide frame 30 creates a high-pressure gas atmosphere 6 inside the sealed container 1. The high-pressure gas refrigerant inside the sealed container 1 is discharged to the outside from the discharge piping 11.

The bleed outlet 3eo of the bleed hole 3e of the oscillating base plate 3b is temporarily connected to the gas introduction passage 14 due to the revolution of the oscillating scroll 3. By temporarily connecting the bleed outlet 3eo of the bleed hole 3e to the gas introduction passage 14, the intermediate pressure gas refrigerant being compressed in the compression chamber 2b connected to the bleed hole 3e is bled out of the compression chamber 2b and led to the intermediate pressure space 32b via the gas introduction passage 14. The temporary connection of the bleed hole 3e to the gas introduction passage 14 is performed intermittently during the revolution of the oscillating scroll 3.

The intermediate pressure space 32b is a space sealed by the upper annular seal member 36a and the lower annular seal member 36b. Therefore, the intermediate pressure gas refrigerant introduced into the intermediate pressure space 32b causes the compliant frame 31 to float in the axial direction.

The intermediate pressure Pm1 in the boss outer space 38 is the sum of a predetermined pressure α determined by the elastic force of the intermediate pressure adjustment spring 39c and the area of the intermediate pressure adjustment valve 39a exposed to the intermediate pressure, and the pressure Ps in the suction side space 8, which is Ps + α. The intermediate pressure Pm2 in the intermediate pressure space 32b is the product of a predetermined magnification β determined by the position of the compression chamber 2b communicating with the intermediate pressure space 32b and the pressure Ps in the suction side space 8, which is Ps x β.

Due to the intermediate pressures Pm1 and Pm2 and the high pressure due to the high pressure gas atmosphere 6 acting on the lower end surface 34 of the compliant frame, the compliant frame 31 floats in the axial direction along the inner peripheral surface of the guide frame 30. The force caused by this floating is called the pressing force.

The pushing force of the compliant frame 31 pushes the orbiting scroll 3 up through the thrust surface 33. As the orbiting scroll 3 rises, the gap between the base plate and the tips of the scrolls of the fixed scroll 4 and the orbiting scroll 3 that form the compression chamber 2b becomes smaller. As a result, the high-pressure gas refrigerant is less likely to leak from the compression chamber 2b, resulting in a highly efficient scroll compressor.

On the other hand, if the pressure inside the compression chamber 2b becomes abnormally high during startup and liquid compression, the axial gas load acting on the orbiting scroll 3 becomes excessive. When this happens, the orbiting scroll 3 pushes down on the compliant frame 31 via the thrust surface 33. In other words, a relatively large gap is created between the tip of each of the spiral bodies of the fixed scroll 4 and the orbiting scroll 3 and the base plate, which suppresses abnormal pressure increases inside the compression chamber 2b and results in a highly reliable scroll compressor 100 with no damage to the sliding parts.

(When injection is ON)
The operation of the scroll compressor 100 when the injection is ON will be described. After the scroll compressor 100 is started, an on-off valve (not shown) provided in the injection pipe 50 is opened, and the injection refrigerant is supplied from the outside through the injection pipe 50 to the compression mechanism 2. Specifically, the injection refrigerant that has passed through the injection pipe 50 is supplied to the compression chamber 2b of the compression mechanism 2 through the injection inflow path 4d and the injection port 4e of the fixed scroll 4. The injection refrigerant supplied to the compression chamber 2b is mixed with the refrigerant that has been taken in through the suction pipe 7 and is compressed in the compression chamber 2b, and then discharged from the discharge port 12.

Next, the flow of oil in the scroll compressor 100 will be described with reference to FIG. 1. When the drive shaft 19 rotates with the rotation of the motor rotor 16a, the sealed container 1 is filled with gas compressed by the compression mechanism 2, creating a high-pressure gas atmosphere 6. The oil reservoir space 5 exposed to the high-pressure gas atmosphere 6 and the suction side space 8 of the compression mechanism 2 are connected by the oil supply passage 23 of the drive shaft 19, so the oil in the oil reservoir space 5 is sucked up by the differential pressure. This oil is supplied from the oil supply passage 23, supply passage 24a, and supply passage 24b to the main bearing 25, auxiliary bearing 27, and oscillating bearing 26, respectively. The oil supplied to the main bearing 25, auxiliary bearing 27, and oscillating bearing 26 lubricates the bearings and is then returned to the oil reservoir space 5 at the bottom of the sealed container 1.

Here, the oil supplied to the main bearing 25 lubricates the main bearing 25 and is then guided to the boss outer space 38 or the high-pressure gas atmosphere 6. After passing through the main bearing 25, the oil is supplied to the boss 3c of the orbiting scroll 3, lubricates the orbiting bearing 26, and is decompressed in the process, becoming intermediate pressure and eventually being guided to the boss outer space 38. When the oil is guided to the boss outer space 38, it overcomes the spring force of the intermediate pressure adjustment spring 39c as it passes through the through passage 39e, pushes up the intermediate pressure adjustment valve 39a, and is temporarily discharged into the compliant frame upper space 32a. This oil is then discharged inside the Oldham ring 40 and supplied to the suction side space 8.

In addition, some of the oil in the refrigerant discharged into the compliant frame upper space 32a is supplied to the thrust surface 3d, then supplied to the reciprocating sliding surface 41 and flows into the suction side space 8. The oil that flows into the suction side space 8 is sucked into the compression mechanism 2 together with the low-pressure gas refrigerant. The sucked oil seals and lubricates the gaps between the fixed scroll 4 and the oscillating scroll 3 that make up the compression mechanism 2, enabling normal operation.

When injection is ON, the oil flow is simply mixed with the injected refrigerant in the compression mechanism 2 in the aforementioned path, and no significant change in the flow occurs.

Figure 4 is a schematic cross-sectional view of the compression mechanism in the scroll compressor according to the first embodiment. Figure 4 shows the cross-sectional portion of the compression mechanism 2 as viewed from the oscillating base plate 3b side. For ease of explanation, Figure 4 shows the bleed inlet 3ei and bleed outlet 3eo of the bleed hole 3e provided in the oscillating base plate 3b, and the gas introduction passage 14 provided in the compliant frame 31. In addition, to make it easier to distinguish between the fixed scroll 4a and the oscillating scroll 3a, the oscillating scroll 3a is shaded. This is the same in the following figures.

The compression mechanism 2 has a so-called asymmetric spiral structure in which the spiral length of the fixed spiral body 4a is different from the spiral length of the oscillating spiral body 3a. The fixed spiral body 4a is made longer than the oscillating spiral body 3a by an angle of 180 degrees centered on the center of the fixed spiral body 4a. When the spiral bodies of the fixed scroll 4 and the oscillating scroll 3 are combined, the position of the end 3f of the oscillating spiral body 3a coincides with the position of the end 4f of the fixed spiral body 4a, as shown in FIG.

The compression chamber 2b formed by combining the fixed scroll 4a and the oscillating scroll 3a has a first compression chamber 56a formed by a room on the oscillating outward surface side of the oscillating scroll 3a, and a second compression chamber 56b formed by a room on the oscillating inward surface side of the oscillating scroll 3a. The room on the oscillating outward surface side is a room formed by the outward surface 3ab of the oscillating scroll 3a of the oscillating scroll 3 and the inward surface 4aa of the fixed scroll 4a. The room on the oscillating inward surface side is a room formed by the inward surface 3aa of the oscillating scroll 3a and the outward surface 4ab of the fixed scroll 4a.

As described above, the fixed base plate 4b is formed with the injection port 4e. At least one injection port 4e is provided on the fixed base plate 4b. Two or more injection ports 4e may be provided. In this embodiment 1, as shown in FIG. 4, four injection ports 4e are provided in a row in the circumferential direction. The cross-sectional shape of the injection port 4e is, for example, circular. The diameter of the injection port 4e is smaller than the tooth thickness t of the oscillating scroll 3a of the oscillating scroll 3. In other words, the diameter of the injection port 4e and the tooth thickness t of the oscillating scroll 3a are in a size relationship such that the injection port 4e is completely blocked by the oscillating scroll 3a.

The bleed hole 3e is connected to the second compression chamber 56b of the compression chamber 2b. The bleed inlet 3ei of the bleed hole 3e is open to the second compression chamber 56b. The bleed hole 3e intermittently connects the intermediate pressure second compression chamber 56b during compression to the gas introduction passage 14 of the compliant frame 31. The bleed hole 3e intermittently connects the intermediate pressure second compression chamber 56b during compression to the intermediate pressure space 32b via the gas introduction passage 14. Here, the revolution angle range of the swing scroll 3 when the intermediate pressure second compression chamber 56b during compression and the intermediate pressure space 32b are connected via the bleed hole 3e is defined as the intermediate pressure bleed section. The revolution angle is an angle centered on the axis of the main shaft 20 of the drive shaft 19.

Next, the position of the injection port 4e will be described. The injection port 4e is formed from the inner side of the inward surface 4aa of the fixed scroll 4a by the tooth thickness t of the oscillating scroll 3a to the outer side of the outward surface 4ab of the fixed scroll 4a by the tooth thickness t of the oscillating scroll 3a. By forming the injection port 4e at the above position, the injection port 4e can be connected to the first compression chamber 56a and the second compression chamber 56b in different ranges of the revolution angle of the oscillating scroll 3. This point will be described later.

In addition, the injection port 4e is formed at a position that communicates with the second compression chamber 56b when the suction of the refrigerant is completed and the compression process starts. This allows the injection refrigerant to be supplied to the second compression chamber 56b before the first compression chamber 56a. The injection port 4e is formed at the above position for the following reasons.

As described above, the compression mechanism 2 has an asymmetrical spiral structure. When the compression mechanism 2 has an asymmetrical spiral structure, the second compression chamber 56b on the inwardly facing side of the swing scroll 3 starts compression 180 degrees later than the first compression chamber 56a on the outwardly facing side of the swing scroll 3. Therefore, the pressure rise in the second compression chamber 56b is slower than that in the first compression chamber 56a, and the pressure in the second compression chamber 56b at the same revolution angle is lower than that in the first compression chamber 56a. Therefore, the pressure difference between the pressure of the injection refrigerant and the pressure of the second compression chamber 56b is larger than the pressure difference between the pressure of the injection refrigerant and the pressure of the first compression chamber 56a, and the second compression chamber 56b is easier to supply the injection refrigerant to than the first compression chamber 56a. Therefore, when the suction of the refrigerant is completed and the compression process is started, the injection refrigerant is first injected into the second compression chamber 56b, which is easier to supply, and then into the first compression chamber 56a. This allows the injection amount to be increased compared to the conventional configuration in which the injection refrigerant was supplied only to the first compression chamber 56a.

In addition, the injection port 4e is formed at a position that does not communicate with the second compression chamber 56b while the second compression chamber 56b and the gas introduction passage 14 are in communication with each other through the bleed hole 3e. In other words, the injection port 4e is formed at a position that does not communicate with the second compression chamber 56b while the revolution angle of the swing scroll 3 is in the intermediate pressure bleed section. Therefore, from the viewpoint of the inflow and outflow of the refrigerant into the second compression chamber 56b, the inflow of the injection refrigerant into the second compression chamber 56b through the injection port 4e and the outflow of the refrigerant from the second compression chamber 56b through the bleed hole 3e are not performed simultaneously. Hereinafter, the inflow of the injection refrigerant into the second compression chamber 56b through the injection port 4e is referred to as refrigerant injection, and the outflow of the refrigerant from the second compression chamber 56b through the bleed hole 3e is referred to as bleed from the bleed hole 3e.

<Compression Operation in Compression Mechanism 2>
The compression operation in the compression mechanism 2 will now be described in detail.

Figure 5 is a compression process diagram showing the operation of the oscillating scroll during rotation in the scroll compressor according to embodiment 1. Figure 5 shows the moment-to-moment movement of the oscillating scroll 3 in four stages, in the order of (a) to (d). Figure 6 is an explanatory diagram showing the operation of each compression chamber (refrigerant injection and air extraction from the bleed hole) according to the revolution angle during the compression process of the scroll compressor according to embodiment 1.

Figure 5 (a) shows the state where the end 3f of the oscillating scroll 3a and the end 4f of the fixed scroll 4a are in the same phase. The revolution angle of the oscillating scroll 3 in this state is 0°. In this state, the suction of refrigerant is completed in the first compression chamber 56a and the second compression chamber 56b, and the compression process begins. In this state, the second compression chamber 56b is connected to the injection port 4e, and refrigerant is injected from the injection port 4e into the second compression chamber 56b (Figure 6 (1)).

As the oscillating scroll 3 revolves from the position shown in Figure 5 (a), the injection port 4e is gradually blocked by the oscillating scroll 3a, and communication between the second compression chamber 56b and the injection port 4e comes to an end.

Figure 5 (b) shows a state where the communication between the second compression chamber 56b and the injection port 4e has ended, and the first compression chamber 56a and the injection port 4e are in communication. In this state, refrigerant is injected from the injection port 4e into the first compression chamber 56a (Figure 6 (2)). Note that when multiple injection ports 4e are formed as shown in Figure 5, some of the multiple injection ports 4e do not communicate with the first compression chamber 56a and the other parts do not communicate with the second compression chamber 56b. In other words, multiple injection ports 4e do not communicate with the first compression chamber 56a and the second compression chamber 56b at the same time.

Figure 5 (c) shows the state in which the bleed outlet 3eo of the bleed hole 3e of the oscillating base plate 3b starts to communicate with the gas introduction passage 14. That is, Figure 5 (c) shows the state at the beginning of the intermediate pressure bleed section. The revolution angle of the oscillating scroll 3 when the oscillating scroll 3 is in the position of Figure 5 (c) is the first revolution angle. That is, the first revolution angle is the revolution angle of the oscillating scroll 3 at the start of the intermediate pressure bleed section. When the oscillating scroll 3 is located at the first revolution angle, the bleed hole 3e communicates with the gas introduction passage 14, and bleed air is performed from the bleed hole 3e (Figure 6 (3)). Also, when the oscillating scroll 3 is located at the first revolution angle, the injection port 4e continues to communicate with the first compression chamber 56a from the state of Figure 5 (b), and refrigerant injection is performed into the first compression chamber 56a (Figure 6 (2)).

Figure 5(d) shows the state immediately after the connection between the bleed outlet 3eo of the bleed hole 3e of the oscillating base plate 3b and the gas introduction passage 14 is completed. The revolution angle of the oscillating scroll 3 when the oscillating scroll 3 is in the position of Figure 5(d) is the second revolution angle. In other words, the second revolution angle is the revolution angle of the oscillating scroll 3 at the end of the intermediate pressure bleed section. When the oscillating scroll 3 is at the second revolution angle, the bleed hole 3e faces the thrust surface 33 of the compliant frame 31, and the bleed hole 3e is blocked by the thrust surface 33. Therefore, the bleed from the bleed hole 3e is stopped.

When the orbiting scroll 3 is positioned at the second revolution angle, the injection port 4e starts communicating with the second compression chamber 56b, and refrigerant is injected from the injection port 4e into the second compression chamber 56b (Figure 6 (4)). In other words, when the orbiting scroll 3 is positioned at the second revolution angle, the second compression chamber 56b switches from extraction from the bleed hole 3e to refrigerant injection. The start timing of refrigerant injection into the second compression chamber 56b is not limited to when the orbiting scroll 3 is positioned at the second revolution angle, but may be outside the intermediate pressure bleed zone.

On the other hand, in the first compression chamber 56a, when the orbiting scroll 3 is positioned at the second revolution angle, the injection port 4e that was connected to the first compression chamber 56a is blocked by the orbiting scroll 3a, and refrigerant injection is terminated. After the state shown in FIG. 5(d), the compression mechanism 2 returns to the state shown in FIG. 5(a).

To summarize the above series of operations, as is clear from FIG. 6, refrigerant injection is performed into the first compression chamber 56a and the second compression chamber 56b in the range where the revolution angle of the swing scroll 3 is different. This is because the injection port 4e is formed between the inside of the inward surface 4aa of the fixed scroll 4a by the tooth thickness of the swing scroll 3a and the outside of the outward surface 4ab of the fixed scroll 4a by the tooth thickness of the swing scroll 3a. By forming the injection port 4e in the above range, the swing scroll 3a moves across the injection port 4e in the radial direction during the revolution of the swing scroll 3. Therefore, the injection port 4e is connected to the first compression chamber 56a or the second compression chamber 56b, and refrigerant injection can be performed into both the first compression chamber 56a and the second compression chamber 56b.

The injection port 4e is located in such a position that it communicates with the second compression chamber 56b when the intake of the refrigerant is complete. Therefore, as shown in FIG. 6, after the compression process starts, refrigerant is injected into the second compression chamber 56b (FIG. 6(1)) before the first compression chamber 56a (FIG. 6(2)). Because the pressure in the second compression chamber 56b is lower than that of the first compression chamber 56a, the injection amount can be increased.

As mentioned above, the pressures in the first compression chamber 56a and the second compression chamber 56b are different, and there is a pressure difference. For this reason, the size and shape of the injection port 4e are designed so that the first compression chamber 56a and the second compression chamber 56b do not communicate with each other through the injection port 4e. This makes it possible to prevent the refrigerant in the second compression chamber 56b from leaking into the first compression chamber 56a.

In addition, in the first embodiment, while refrigerant injection into both the first compression chamber 56a and the second compression chamber 56b is possible, refrigerant injection into the second compression chamber 56b and extraction from the second compression chamber 56b are not performed simultaneously. If refrigerant injection into the second compression chamber 56b and extraction from the second compression chamber 56b were to be performed simultaneously, an excessive amount of refrigerant gas would be supplied to the intermediate pressure space 32b through the extraction hole 3e and the gas introduction passage 14.

If an excessive amount of refrigerant gas is supplied to the intermediate pressure space 32b, the pressure in the intermediate pressure space 32b increases, and an excessive pressing force is applied from the compliant frame 31 to the swing scroll 3. However, in this embodiment 1, the injection port 4e does not communicate with the second compression chamber 56b in the intermediate pressure extraction section, and refrigerant injection into the second compression chamber 56b and extraction from the second compression chamber 56b are not performed simultaneously. This prevents excessive pressing force from the compliant frame 31 to the swing scroll 3. Therefore, refrigerant injection can be performed into both the first compression chamber 56a and the second compression chamber 56b while taking advantage of the characteristics of the compliant frame 31, and an increase in refrigeration capacity can be expected.

<Description of Refrigeration Cycle Apparatus 200>
Next, a refrigeration cycle device in which the scroll compressor 100 is mounted will be described.
FIG. 7 is a schematic configuration diagram of the refrigeration cycle device according to the first embodiment.
The refrigeration cycle device 200 includes a scroll compressor 100, a four-way switching valve 103 connected to the discharge side of the scroll compressor 100, and an outdoor heat exchanger 104. The refrigeration cycle device 200 further includes a pressure reducer 105a and a pressure reducer 105b such as an electric expansion device, an indoor heat exchanger 106, and a gas-liquid separator 107. In the refrigeration cycle device 200, these devices are sequentially connected via piping to form a refrigeration circuit. The outdoor heat exchanger 104 and the indoor heat exchanger 106 function as a condenser or an evaporator by switching the four-way switching valve 103. The four-way switching valve 103 can be omitted in the refrigeration cycle device 200. Therefore, the refrigeration cycle device 200 may be configured to include the scroll compressor 100, a condenser, a pressure reducer, an evaporator, and a gas-liquid separator 107.

The gas-liquid separator 107 separates the two-phase refrigerant that flows in into a saturated gas refrigerant and a saturated liquid refrigerant. The gas-liquid separator 107 has an injection pipe 50, which is a gas outflow pipe that discharges the separated saturated gas refrigerant to the outside. The downstream end of the injection pipe 50 is connected to the scroll compressor 100. An on-off valve 50a that opens and closes the injection pipe 50 is connected to the injection pipe 50.

In heating operation when the refrigeration cycle device 200 is applied to an air conditioner, for example, the four-way switching valve 103 is connected to the solid line side in FIG. 5. The high-temperature, high-pressure refrigerant compressed by the scroll compressor 100 flows to the indoor heat exchanger 106, condenses, and liquefies, and is then decompressed by the pressure reducer 105b to become a low-temperature, low-pressure two-phase state. The two-phase refrigerant then flows into the gas-liquid separator 107. The saturated liquid refrigerant separated by the gas-liquid separator 107 passes through the pressure reducer 105a and flows to the outdoor heat exchanger 104, where it evaporates and gasifies. The gasified refrigerant returns to the scroll compressor 100 again through the four-way switching valve 103. That is, in heating operation, the refrigerant circulates as shown by the solid line arrows in FIG. 5. Through this circulation, the refrigerant exchanges heat with the outside air in the outdoor heat exchanger 104, which is an evaporator, and absorbs heat. The refrigerant that has absorbed heat is sent to the indoor heat exchanger 106, which serves as a condenser, and exchanges heat with the indoor air to warm the indoor air.

In cooling operation when the refrigeration cycle device 200 is applied to an air conditioner, for example, the four-way switching valve 103 is connected to the dashed line side in FIG. 5. The high-temperature, high-pressure refrigerant compressed by the scroll compressor 100 flows to the outdoor heat exchanger 104, condenses, and liquefies, and is then decompressed by the pressure reducer 105a to become a low-temperature, low-pressure two-phase state and flows into the gas-liquid separator 107. The saturated liquid refrigerant separated by the gas-liquid separator 107 flows to the indoor heat exchanger 106 via the pressure reducer 105b, evaporates, and gasifies. The gasified refrigerant returns to the scroll compressor 100 again through the four-way switching valve 103. That is, in cooling operation, the refrigerant circulates as shown by the dashed arrow in FIG. 5. Through this circulation, the refrigerant exchanges heat with the indoor air in the indoor heat exchanger 106, which is an evaporator, and absorbs heat from the indoor air. This cools the indoor air. The refrigerant that has absorbed heat is sent to the outdoor heat exchanger 104, which serves as a condenser, where it exchanges heat with the outside air and dissipates heat to the outside air.

In the above heating and cooling operations, the saturated gas refrigerant separated in the gas-liquid separator 107 is supplied to the scroll compressor 100 through the injection piping 50. The saturated gas refrigerant supplied to the scroll compressor 100 is supplied to the first compression chamber 56a or the second compression chamber 56b through the injection inlet path 4d and the injection port 4e provided in the fixed base plate 4b of the fixed scroll 4. In the refrigeration cycle device 200 equipped with the gas-liquid separator 107, the injection refrigerant is a gas refrigerant, and gas injection is performed.

Here, the refrigeration cycle device 200 equipped with the gas-liquid separator 107 has been described, but the refrigeration cycle device to which the scroll compressor 100 of the present disclosure is applied is not limited to the refrigeration cycle device equipped with the gas-liquid separator 107. The refrigeration cycle device to which the scroll compressor 100 of the present disclosure is applied may be, for example, a refrigeration cycle device that does not include the gas-liquid separator 107 and includes a scroll compressor, a condenser, a pressure reducer, and an evaporator. In this case, the refrigerant between the condenser and the pressure reducer may be branched, and the branched refrigerant may be decompressed and injected into the scroll compressor 100.

As described above, the scroll compressor 100 of the first embodiment includes a compression mechanism 2 having a fixed scroll 4 and an orbiting scroll 3. The compression mechanism 2 compresses the refrigerant in the compression chamber 2b formed by combining the fixed scroll 4 and the orbiting scroll 3a of the orbiting scroll 3 by revolving the orbiting scroll 3 relative to the fixed scroll 4. The compression mechanism 2 has an asymmetrical spiral structure in which the spiral length of the fixed scroll 4a of the fixed scroll 4 is different from the spiral length of the orbiting scroll 3a of the orbiting scroll 3. The fixed base plate 4b is provided with an injection port 4e that supplies the injection refrigerant to the compression chamber 2b. The compression chamber 2b has a first compression chamber 56a formed by the outward surface 3ab of the oscillating scroll 3a and the inward surface 4aa of the fixed scroll 4a, and a second compression chamber 56b formed by the inward surface 3aa of the oscillating scroll 3a and the outward surface 4ab of the fixed scroll 4a. The injection port 4e is formed from a tooth thickness of the oscillating scroll 3a inside the inward surface 4aa of the fixed scroll 4a to a tooth thickness of the oscillating scroll 3a outside the outward surface 4ab of the fixed scroll 4a. The injection port 4e is formed at a position that communicates with the second compression chamber 56b when the suction of the refrigerant is completed.

In this way, the injection port 4e is formed between the tooth thickness of the oscillating scroll 3a and the tooth thickness of the oscillating scroll 3a from the inward surface 4aa of the fixed scroll 4a to the tooth thickness of the oscillating scroll 3a and the outward surface 4ab of the fixed scroll 4a. This allows injection into both the first compression chamber 56a and the second compression chamber 56b. In addition, the injection port 4e is formed at a position that communicates with the second compression chamber 56b when the refrigerant intake is completed and the compression process is started. As a result, when injecting into both the first compression chamber 56a and the second compression chamber 56b, injection is first performed into the second compression chamber 56b, which has a lower pressure than the first compression chamber 56a in the asymmetric scroll structure. As a result of the above, a large injection flow rate can be obtained.

In the scroll compressor 100 of the first embodiment, the swinging base plate 3b has an air bleed hole 3e, which is a hole formed penetrating from one surface on which the swinging scroll 3a is provided to the other surface. The air bleed hole 3e intermittently connects the second compression chamber 56b, which has an intermediate pressure higher than the suction pressure of the refrigerant and lower than the discharge pressure, to the intermediate pressure space 32b formed between the compliant frame 31 and the guide frame 30 on the other surface side of the swinging base plate 3b. The revolution angle range of the swinging scroll 3 when the second compression chamber 56b and the intermediate pressure space 32b are connected through the air bleed hole 3e is defined as the intermediate pressure extraction section. At this time, the injection port 4e is formed at a position that does not communicate with the second compression chamber 56b while the revolution angle of the swinging scroll 3 is in the intermediate pressure extraction section. Here, the scroll compressor 100 includes a compliant frame 31 and a guide frame 30. The intermediate pressure space 32b is a space formed between the compliant frame 31 and the guide frame 30. The compliant frame 31 supports the orbiting scroll 3 in the axial direction by the intermediate pressure of the refrigerant introduced from the second compression chamber 56b through the bleed hole 3e into the intermediate pressure space 32b.

In this way, the injection port 4e is formed at a position that does not communicate with the second compression chamber 56b while the revolution angle of the orbiting scroll 3 is in the intermediate pressure extraction section. This prevents refrigerant injection into the second compression chamber 56b and extraction from the second compression chamber 56b from occurring simultaneously, and prevents excessive refrigerant gas from being supplied from the second compression chamber 56b to the intermediate pressure space 32b. By preventing excessive refrigerant gas from being supplied to the intermediate pressure space 32b, it is possible to prevent the pressure in the intermediate pressure space 32b from increasing and excessive pressing force from the compliant frame 31 acting on the orbiting scroll 3.

In the scroll compressor 100 of the first embodiment, the compliant frame 31 is formed with a gas introduction passage 14 that communicates with the bleed hole 3e when the revolution angle of the swing scroll 3 is located in the intermediate pressure bleed zone and introduces the intermediate pressure refrigerant in the second compression chamber 56b into the intermediate pressure space 32b. In addition, the compliant frame 31 is formed with a thrust surface 33 that faces the bleed hole 3e and serves as an opposing surface that blocks the bleed hole 3e when the revolution angle of the swing scroll 3 is located outside the intermediate pressure bleed zone.

In this way, the gas introduction passage 14 and thrust surface 33 formed in the compliant frame 31 provide intermittent communication between the second compression chamber 56b and the intermediate pressure space 32b.

The scroll compressor 100 of embodiment 1 has two or more injection ports 4e.

By providing two or more injection ports 4e in this way, the injection volume can be further increased.

1 sealed vessel, 2 compression mechanism, 2b compression chamber, 3 swing scroll, 3a swing scroll, 3aa inward surface, 3ab outward surface, 3b swing base plate, 3c boss portion, 3d thrust surface, 3e bleed hole, 3ei bleed inlet, 3eo bleed outlet, 3f end, 4 fixed scroll, 4a fixed scroll, 4aa inward surface, 4ab outward surface, 4b fixed base plate, 4d injection inlet path, 4e injection port, 4f end, 5 oil reservoir space, 6 high pressure gas atmosphere, 7 intake pipe, 8 intake side space, 9 intake check valve, 10 spring, 11 discharge pipe, 12 discharge port, 14 gas introduction flow path, 15a fixed side Oldham ring groove, 15b swing side Oldham ring groove, 16 electric motor, 16a Motor rotor, 16b motor stator, 18a balance weight, 18b balance weight, 19 drive shaft, 20 main shaft, 21 swing shaft, 22 auxiliary shaft, 23 oil supply passage, 24a supply passage, 24b supply passage, 25 main bearing, 26 swing bearing, 27 auxiliary bearing, 28 thrust bearing, 29 holder, 30 guide frame, 30a upper mating cylindrical surface, 30b lower mating cylindrical surface, 30c flow passage, 31 compliant frame, 32a compliant frame upper space, 32b intermediate pressure space, 33 thrust surface, 34 compliant frame lower end surface, 35a upper mating cylindrical surface, 35b lower mating cylindrical surface, 36a upper annular seal member, 36b lower annular seal member, 37 subframe, 38 boss portion outer space, 39a intermediate pressure regulating valve, 39c Intermediate pressure adjusting spring, 39d intermediate pressure adjusting valve space, 39e through flow passage, 40 Oldham ring, 41 reciprocating sliding surface, 42a fixed side key, 42b swinging side key, 50 injection piping, 50a on-off valve, 56a first compression chamber, 56b second compression chamber, 100 scroll compressor, 103 four-way switching valve, 104 outdoor heat exchanger, 105a pressure reducer, 105b pressure reducer, 106 indoor heat exchanger, 107 gas-liquid separator, 200 refrigeration cycle device.

Claims (7)

a compression mechanism section including a fixed scroll having a fixed base plate and a fixed scroll body provided on the fixed base plate, and an orbiting scroll having a swing base plate and a swinging scroll body provided on the swing base plate, the compression mechanism section compressing a refrigerant in a compression chamber formed by combining the fixed scroll body and the swinging scroll body by causing the swinging scroll to make an orbital motion relative to the fixed scroll,
The compression mechanism has an asymmetrical spiral structure in which a spiral length of the fixed scroll of the fixed scroll is different from a spiral length of the orbiting scroll of the orbiting scroll, and an injection port is formed in the fixed base plate to supply an injection refrigerant to the compression chamber,
the compression chamber includes a first compression chamber formed by an outward surface of the oscillating scroll and an inward surface of the fixed scroll, and a second compression chamber formed by the inward surface of the oscillating scroll and the outward surface of the fixed scroll,
the injection port is formed from a position from an inner side of the inward surface of the fixed scroll body, equivalent to the tooth thickness of the oscillating scroll, to an outer side of the outward surface of the fixed scroll body, equivalent to the tooth thickness of the oscillating scroll, so as to communicate with the first compression chamber and the second compression chamber at different ranges of the orbital angle of the oscillating scroll, and is formed at a position so as to communicate with the second compression chamber when the suction of refrigerant into the second compression chamber is completed and the compression process is started. the oscillating bed plate has a bleed hole formed through the oscillating bed plate from one surface on which the oscillating scroll is provided to the other surface, the bleed hole intermittently communicating the second compression chamber, which has an intermediate pressure higher than the suction pressure and lower than the discharge pressure of the refrigerant, with an intermediate pressure space formed on the other surface of the oscillating bed plate,
When the orbital angle range of the orbiting scroll when the second compression chamber and the intermediate pressure space communicate with each other through the bleed hole is defined as an intermediate pressure bleed section,
2. The scroll compressor according to claim 1, wherein the injection port is formed at a position not communicating with the second compression chamber while the orbital scroll has an orbital angle in the intermediate pressure extraction zone. A compliant frame that abuts against the other surface of the orbiting scroll and supports the orbiting scroll in the axial direction;
a guide frame disposed on an opposite side of the compliant frame from the orbiting scroll and configured to house the compliant frame;
the intermediate pressure space is a space formed between the compliant frame and the guide frame,
3. The scroll compressor according to claim 2 , wherein the compliant frame supports the orbiting scroll in the axial direction by intermediate pressure of refrigerant introduced from the second compression chamber through the bleed hole into the intermediate pressure space. 4. The scroll compressor according to claim 3, wherein the compliant frame is formed with an introduction passage that communicates with the bleed hole when the orbital angle of the orbiting scroll is located within the intermediate pressure bleed zone and that introduces the intermediate pressure refrigerant in the second compression chamber into the intermediate pressure space, and an opposing surface that faces the bleed hole and closes the bleed hole when the orbital angle of the orbiting scroll is located outside the intermediate pressure bleed zone. The scroll compressor according to any one of claims 1 to 4 , comprising two or more injection ports. A refrigeration cycle device comprising: the scroll compressor according to any one of claims 1 to 5 ; a condenser; a pressure reducer; and an evaporator. 7. The refrigeration cycle apparatus according to claim 6 , further comprising a gas-liquid separator, wherein saturated gas refrigerant separated by the gas-liquid separator is supplied to the compression chamber from the injection port of the scroll compressor.

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