WO2022185365A1

WO2022185365A1 - Scroll compressor and refrigeration cycle device

Info

Publication number: WO2022185365A1
Application number: PCT/JP2021/007628
Authority: WO
Inventors: 秀明北川; 照彦西木
Original assignee: 三菱電機株式会社
Priority date: 2021-03-01
Filing date: 2021-03-01
Publication date: 2022-09-09
Also published as: JPWO2022185365A1; CN116917624A

Abstract

Provided is a scroll compressor including a compressing mechanism that compresses, by causing an oscillating scroll to revolve with respect to a stationary scroll, a refrigerant in a compression chamber formed by combining a stationary spiral and an oscillating spiral. The compressing mechanism has an asymmetrical spiral structure in which the spiral length of the stationary spiral of the stationary scroll is different from the spiral length of the oscillating spiral of the oscillating scroll. In a stationary base plate, an injection port from which the injection refrigerant is supplied into the compression chamber is formed. The compression chamber has a first compression chamber formed by the outer surface of the oscillating spiral and the inner surface of the stationary spiral and a second compression chamber formed by the inner surface of the oscillating spiral and the outer surface of the stationary spiral. The injection port is formed between a portion that is farther on the inner side than the inner surface of the stationary spiral is by an amount corresponding to the gear thickness of the oscillating spiral and a portion that is farther on the outer side than the outer surface of the stationary spiral is by an amount corresponding to the gear thickness of the oscillating spiral. In addition, the injection port is formed at a position at which communication with the second compression chamber is established in a state in which a compression process is started after refrigerant intake is completed.

Description

Scroll compressor and refrigeration cycle equipment

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

Conventionally, there is a scroll compressor in which injection refrigerant is supplied to a compression chamber formed by combining a fixed spiral body of a fixed scroll and an oscillating spiral body of an oscillating scroll (see, for example, Patent Document 1). In the scroll compressor of Patent Document 1, the first compression chamber is formed by the outward surface of the oscillating spiral and the inward surface of the fixed spiral, and the inward surface of the oscillating spiral and the outward surface of the fixed spiral are arranged to compress the compression chamber. He is trying to perform injection only to the 1st compression chamber among the formed 2nd compression chambers.

WO2017/141342

In the scroll compressor of Patent Document 1, injection is performed only in the first compression chamber, and injection is not performed in the second compression chamber. Such a configuration has a problem that a large injection flow rate cannot be obtained.

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

The scroll compressor of the present disclosure includes a fixed scroll having a fixed base plate and a fixed spiral provided on the fixed base plate, and an oscillating scroll having an oscillating base plate and an oscillating spiral provided on the oscillating base plate. and a compression mechanism for compressing the refrigerant in a compression chamber formed by combining the fixed spiral body and the oscillating spiral body by orbiting the orbiting scroll with respect to the fixed scroll, The compression mechanism section has an asymmetric spiral structure in which the spiral length of the stationary spiral of the fixed scroll differs from the spiral length of the oscillating spiral of the oscillating scroll. The compression chamber includes a first compression chamber formed by the outward surface of the oscillating spiral and the inward surface of the fixed spiral, the inward surface of the oscillating spiral and the fixed spiral. and a second compression chamber formed by the outer surface of the stationary spiral body, wherein the injection port communicates with the first compression chamber and the second compression chamber in different ranges of revolution angles of the orbiting scroll. It is formed between the inside of the inward surface by the tooth thickness of the oscillating spiral and the outward surface of the fixed spiral to the outside by the tooth thickness of the oscillating spiral, and the compression process is completed when the suction of the refrigerant is completed. It is formed at a position where it communicates with the second compression chamber when it is in a state of being started.

According to the scroll compressor of the present disclosure, the injection port extends from the inside of the inward surface of the stationary spiral by the tooth thickness of the oscillating spiral to the outside of the outward surface of the fixed spiral by the tooth thickness of the oscillating spiral, formed between This allows injection into both the first compression chamber and the second compression chamber. Also, the injection port is formed at a position that communicates with the second compression chamber when the refrigerant suction is completed and the compression process is started. Thus, when injecting into both the first compression chamber and the second compression chamber, in the asymmetric spiral structure, the second compression chamber, which has a lower pressure than the first compression chamber, is injected first. 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 Embodiment 1. FIG. FIG. 2 is a partially enlarged view of FIG. 1; FIG. 4 is an explanatory diagram of flow paths formed between a guide frame and a closed container of the scroll compressor according to Embodiment 1; 2 is a schematic cross-sectional view of a compression mechanism portion in the scroll compressor according to Embodiment 1; FIG. FIG. 4 is a compression process diagram showing an operation during rotation of the orbiting scroll in the scroll compressor according to Embodiment 1; FIG. 4 is an explanatory diagram showing the operation contents (refrigerant injection and bleeding from the bleeding holes) of each compression chamber according to the revolution angle in the compression process of the scroll compressor according to Embodiment 1; 1 is a schematic configuration diagram of a refrigeration cycle apparatus according to Embodiment 1; FIG.

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. FIG. 3 is an explanatory diagram of flow paths formed between the guide frame and the closed container of the scroll compressor according to Embodiment 1. FIG. The configuration of the scroll compressor 100 will be described below with reference to FIGS. 1 to 3. FIG.

The scroll compressor 100 is a so-called vertical scroll compressor, and the Z direction, which is the vertical direction in FIG. The scroll compressor 100 compresses and discharges a refrigerant, which is a working gas. As the refrigerant, for example, R407C refrigerant, R410A refrigerant, R32 refrigerant, or the like is used. The scroll compressor 100 includes a closed container 1 , a compression mechanism section 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 a compression mechanism section 2 , an electric motor 16 and a drive shaft 19 are accommodated within a 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 systems, and water heaters. As will be described later, the gas refrigerant that has been compressed by the compression mechanism 2 and has a high pressure is discharged into the high-pressure gas atmosphere 6 inside the sealed container 1 . This gas refrigerant is configured to circulate 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 is connected to the side surface of the sealed container 1 for taking the refrigerant into 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 urged by a spring 10 in a direction to close the suction pipe 7 and prevents the refrigerant from flowing backward. A discharge pipe 11 for discharging the compressed refrigerant from the closed 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 surface of the closed container 1. It is Arrows in the suction pipe 7 and the discharge pipe 11 indicate the direction in which the refrigerant flows.

The closed container 1 has a high-pressure gas atmosphere 6 inside the closed container 1 . The bottom of the sealed container 1 forms an oil reservoir space 5 for storing refrigerating machine oil (hereinafter referred to as oil). The oil reservoir space 5 is located in a high-pressure gas atmosphere 6, below a sub-frame 37 supporting the lower end of the drive shaft 19, below an auxiliary bearing 27 provided on the sub-frame 37, or at the end of the drive shaft 19. It is a space below, etc.

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

The fixed scroll 4 and the orbiting scroll 3 are arranged so that the fixed spiral body 4a and the orbiting scroll body 3a face each other. A compression chamber 2b is formed between the fixed spiral body 4a and the oscillating spiral body 3a by combining the fixed spiral body 4a and the oscillating spiral body 3a in opposite directions. Further, the fixed spiral body 4a of the fixed scroll 4 and the outer peripheral space of the base plate outside the orbiting scroll 3 (hereinafter referred to as the suction side space 8) are a low-pressure space of suction gas atmosphere of suction pressure.

The fixed scroll 4 is fixed with bolts (not shown) or the like to a guide frame 30 that is fixedly supported by the sealed container 1 . A pair of two fixed-side Oldham ring grooves 15 a are formed in a straight line on the outer peripheral portion of the fixed scroll 4 . A pair of two fixed-side keys 42a of the Oldham ring 40 are installed in the fixed-side Oldham ring groove 15a so as to be reciprocally slidable.

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 one surface on which the oscillating spiral body 3a is formed. A swing bearing 26 is provided on the inner surface of the boss portion 3c. The swing shaft 21 of the drive shaft 19 is inserted into the swing bearing 26 , and the rotation of the swing shaft 21 causes the swing scroll 3 to revolve with respect to the fixed scroll 4 .

A compliant frame 31 is arranged in contact with the other surface of the rocking base plate 3b of the rocking scroll 3. A thrust surface 33 of the compliant frame 31 and a slidable thrust surface 3d are formed on the other surface of the oscillating base plate 3b of the oscillating scroll 3. As shown in FIG. A pair of rocking-side Oldham ring grooves 15b are formed in a straight line on the outer peripheral portion of the rocking scroll 3 . The rocking-side Oldham ring groove 15b has a phase difference of about 90 degrees from the fixed-side Oldham ring groove 15a, and a pair of rocking-side keys 42b of the Oldham ring 40 are installed so as to be reciprocally slidable. . The swing-side key 42 b reciprocates on a reciprocating sliding surface 41 formed on the outer periphery of the thrust surface 33 of the compliant frame 31 .

The rocking bed plate 3b is formed with an air bleed hole 3e penetrating from one surface on which the rocking spiral body 3a is provided to the other surface of the rocking bed plate 3b. As shown in FIG. 2, the air bleed holes 3e are composed of an air bleed inlet 3ei formed on the upper surface, which is one surface of the rocking base plate 3b, and an air bleed outlet formed on the lower surface, which is the other surface of the rocking base plate 3b. 3eo. The bleed inlet 3ei opens into the compression chamber 2b. The extraction outlet 3eo intermittently communicates with the gas introduction passage 14 provided in the compliant frame 31 . By intermittently connecting the extraction outlet 3eo to the gas introduction passage 14, the intermediate-pressure gas refrigerant that is being compressed in the compression chamber 2b is introduced to the intermediate pressure space 32b through the extraction hole 3e and the gas introduction passage 14. be killed. The intermediate pressure refers to a pressure higher than the suction pressure and lower than the discharge pressure. In this manner, the air bleed hole 3e intermittently bleeds air from the compression chamber 2b in the middle of compression to the intermediate pressure space 32b as the orbiting scroll 3 revolves.

Inside the sealed container 1, a guide frame 30 is arranged above the electric motor 16, and a sub-frame 37 holding the drive shaft 19 is arranged below the electric motor 16. The guide frame 30 and sub-frame 37 are fixed to the closed container 1 . A compliant frame 31 is housed inside 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 flowing out from the discharge port 12 formed in the fixed scroll 4 passes (FIGS. 1 and 3). 3). The high-pressure gas refrigerant that has flowed out from the discharge port 12 is guided below the compression mechanism section 2 through the flow path 30c. A high-pressure gas atmosphere 6 is formed in the sealed container 1 by guiding the high-pressure gas refrigerant downward from the compression mechanism section 2 .

An upper fitting cylindrical surface 30a is formed on the inner peripheral surface of the guide frame 30 on the fixed scroll 4 side (upper side in FIG. 1). The upper fitting cylindrical surface 30 a is engaged with an upper fitting cylindrical surface 35 a formed on the outer peripheral surface of the compliant frame 31 . On the other hand, a lower fitting cylindrical surface 30b is formed on the inner peripheral surface of the guide frame 30 on the electric motor 16 side (lower side in FIG. 1). The lower fitting cylindrical surface 30 b is engaged with a lower fitting cylindrical surface 35 b formed on the outer peripheral surface of the compliant frame 31 .

An upper annular seal member 36 a and a lower annular seal member 36 b are arranged at two locations on the outer peripheral surface of the compliant frame 31 . An upper annular seal member 36 a and a lower annular seal member 36 b partition between the inner surface of guide frame 30 and the outer surface of compliant frame 31 . An intermediate pressure space 32b is formed by a space partitioned by the upper annular seal member 36a and the lower annular seal member 36b. Although 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, the positions of these seal members are limited to the example of FIG. can't These sealing members may be arranged, for example, at two locations on the inner peripheral surface of the guide frame 30 .

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 in the axial direction of the orbiting scroll 3 . The compliant frame 31 is formed with a gas introduction passage 14 communicating between the thrust surface 33 and the intermediate pressure space 32b. The gas introduction passage 14 communicates with the bleed hole 3 e according to the orbital motion of the orbiting scroll 3 . Intermediate-pressure refrigerant is introduced into the intermediate-pressure space 32b from the compression chamber 2b, which is in the process of being compressed, by connecting the gas introduction passage 14 to the bleed hole 3e. On the other hand, the bleed hole 3e is blocked by facing the thrust surface 33 of the compliant frame 31 according to the orbital motion of the orbiting scroll 3, thereby stopping the introduction of the intermediate-pressure refrigerant into the intermediate-pressure space 32b. . By repeating the communication of the bleed hole 3e with the gas introduction passage 14 and the blockage of the bleed hole 3e by the thrust surface 33 in this way, the intermediate-pressure gas refrigerant flows from the compression chamber 2b to the intermediate-pressure space 32b. Introduction occurs intermittently. The intermediate pressure space 32b becomes intermediate pressure by intermittently introducing the intermediate pressure gas refrigerant.

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

Between the outside of the boss portion 3c of the orbiting scroll 3 and the compliant frame 31, an intermediate-pressure boss portion outer space 38 is provided. In addition, the compliant frame 31 is provided with an intermediate pressure regulating valve space 39d. The intermediate pressure regulating valve space 39d accommodates an intermediate pressure regulating valve 39a for adjusting the pressure of the boss portion outer space 38, an intermediate pressure regulating valve retainer 39b, and an intermediate pressure regulating spring 39c. The intermediate pressure adjusting spring 39c is contracted from its natural length and accommodated in the intermediate pressure adjusting valve space 39d.

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

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

The electric 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 electric motor stator 16b is fixed to the closed container 1 by shrink fitting or the like, and a through flow path (not shown) is formed by a notch in the outer peripheral portion of the electric motor stator 16b. The drive shaft 19 and the electric motor rotor 16a rotate with respect to the electric motor stator 16b when electric power is supplied to the electric motor stator 16b. A balance weight 18a is fixed to the motor rotor 16a and a balance weight 18b is fixed to the drive shaft 19 in order to balance the entire rotation system in the scroll compressor 100. As shown in FIG.

The drive shaft 19 has a swing shaft 21 forming the upper portion of the drive shaft 19 , a main shaft 20 forming the intermediate portion of the drive shaft 19 , and a sub shaft 22 forming the lower portion 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 secondary shaft 22 is supported by its own weight by a thrust bearing 28 . Thrust bearing 28 is fixed to holder 29 , and holder 29 is fixed to sub-frame 37 . The main bearing 25 and the sub-bearing 27 have a cylindrical structure, for example, a slide bearing made of a copper-lead alloy or the like, 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 section 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. A supply passage 24 a is formed in the sub shaft 22 and a supply passage 24 b is formed in the main shaft 20 . The oil sucked up from the oil sump space 5 passes through the oil supply passage 23 and the

supply passages

24a and 24b, and is supplied to sliding portions such as the main bearing 25, the swing bearing 26 and the sub-bearing 27. That is, the oil supply passage 23 opens at the axial upper end portion of the drive shaft 19 and supplies oil to the swing bearing 26 . The supply path 24b opens at a position covered by the main bearing 25 and supplies the main bearing 25 with oil. A supply passage 24a of the subshaft 22 opens at a position covered with the subshaft 22 and supplies the subshaft 22 with oil. Arrows in the oil supply passage 23 and the

supply passages

24a and 24b in FIG. 1 indicate the flow of oil.

Next, an injection mechanism that supplies injection refrigerant to the compression mechanism portion 2 will be described.
A fixed base plate 4b of the fixed scroll 4 is formed with an injection inflow path 4d and an injection port 4e communicating with the injection inflow path 4d. An end of an injection pipe 50 passing through the sealed container 1 is connected to the injection inflow path 4d. The injection port 4e opens to one surface of the fixed base plate 4b on which the fixed spiral body 4a is formed. The injection port 4e supplies the injection refrigerant supplied from the injection pipe 50 through the injection inflow path 4d to the compression chamber 2b.

<Description of Operation of Scroll Compressor 100>
(At startup and when injection is OFF)
The operation of scroll compressor 100 at startup and at injection OFF will be described. When a low-pressure (suction pressure) gas refrigerant is supplied from the suction pipe 7 toward the suction check valve 9, the gas refrigerant overcomes the spring force of the spring 10 and causes the suction check valve 9 to stop (not shown). ). As a result, the suction check valve 9 is opened, and the gas refrigerant flows into the suction side space 8 inside the sealed container 1 .

On the other hand, the drive shaft 19 starts rotating when electric power is supplied to the electric motor 16 from the outside. The rotation of the drive shaft 19 causes the swing shaft 21 to rotate, and the swing scroll 3 performs a swing motion (orbital motion). At this time, the gas refrigerant is sucked into the compression chamber 2 b formed between the orbiting 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. Thereafter, the gas refrigerant pressurized to a high pressure is discharged from the discharge port 12, passes through the flow path 30c, and is guided below the guide frame 30. As shown in FIG. The inside of the sealed container 1 becomes a high-pressure gas atmosphere 6 due to the gas refrigerant guided below the guide frame 30 . A high-pressure gas refrigerant inside the sealed container 1 is discharged to the outside through a discharge pipe 11 .

The bleed outlet 3eo of the bleed hole 3e of the oscillating bed plate 3b temporarily communicates with the gas introduction passage 14 due to the orbital motion of the oscillating scroll 3. The bleed outlet 3eo of the bleed hole 3e is temporarily communicated with the gas introduction passage 14, whereby the intermediate-pressure gas refrigerant that is being compressed in the compression chamber 2b communicating with the bleed hole 3e is bled out of the compression chamber 2b. , through the gas introduction channel 14 into the intermediate pressure space 32b. The temporary communication between the bleed hole 3e and the gas introduction passage 14 is intermittently performed while the orbiting scroll 3 revolves.

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

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

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

Due to the pressing force of the compliant frame 31, the orbiting scroll 3 is pushed up via the thrust surface 33 and floats. The levitation of the orbiting scroll 3 reduces the gap between the tip of each of the spiral bodies of the fixed scroll 4 and the orbiting scroll 3 forming the compression chamber 2b and the base plate. As a result, the high-pressure gas refrigerant is less likely to leak from the compression chamber 2b, and a highly efficient scroll compressor can be obtained.

On the other hand, if the pressure inside the compression chamber 2b becomes abnormally high during start-up and liquid compression, the axial gas load acting on the orbiting scroll 3 becomes excessive. Then, the orbiting scroll 3 pushes down the compliant frame 31 via the thrust surface 33 . That is, a relatively large gap is generated between the tip of the spiral body of each of the fixed scroll 4 and the orbiting scroll 3 and the base plate. can obtain a scroll compressor 100 with a high

(When injection is ON)
The operation of scroll compressor 100 when 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, whereby injection refrigerant is supplied from the outside through the injection pipe 50 to the compression mechanism portion 2 . Specifically, the injection refrigerant that has passed through the injection pipe 50 is supplied to the compression chamber 2b of the compression mechanism section 2 via the injection inflow path 4d of the fixed scroll 4 and the injection port 4e. The injection refrigerant supplied to the compression chamber 2b is mixed with the refrigerant in the process of being compressed taken in from the suction pipe 7 and is discharged from the discharge port 12 after being compressed in the compression chamber 2b.

Next, the flow of oil in the scroll compressor 100 will be described with reference to FIG. When the drive shaft 19 rotates with the rotation of the motor rotor 16 a , the inside of the sealed container 1 is filled with the gas compressed by the compression mechanism 2 and becomes a high-pressure gas atmosphere 6 . Since the oil reservoir space 5 exposed to the high-pressure gas atmosphere 6 and the suction side space 8 of the compression mechanism 2 communicate with each other through the oil supply passage 23 of the drive shaft 19, the oil in the oil reservoir space 5 is be sucked up. This oil is supplied to the main bearing 25, the sub-bearing 27 and the rocking bearing 26 from the oil supply passage 23, the supply passage 24a and the supply passage 24b, respectively. The oil supplied to the main bearing 25 , the sub-bearing 27 and the swing bearing 26 lubricates the bearings and then returns to the oil reservoir space 5 below the closed container 1 .

Here, the oil supplied to the main bearing 25 lubricates the main bearing 25 and then is led to the boss portion outer space 38 or the high-pressure gas atmosphere 6 . After passing through the main bearing 25 , the oil supplied to the boss portion 3 c of the orbiting scroll 3 lubricates the orbiting bearing 26 . led to. The oil guided to the boss outer space 38 overcomes the spring force of the intermediate pressure regulating spring 39c when passing through the through passage 39e, pushes up the intermediate pressure regulating valve 39a, and temporarily enters the compliant frame upper space 32a. Ejected. After that, this oil is discharged inside the Oldham ring 40 and supplied to the suction side space 8 .

A part of the refrigerant discharged to the compliant frame upper space 32 a is supplied to the reciprocating sliding surface 41 after being supplied to the thrust surface 3 d and flows into the suction side space 8 . The oil that has flowed into the suction side space 8 is sucked into the compression mechanism portion 2 together with the low-pressure gas refrigerant. The sucked oil seals and lubricates the gaps between the fixed scroll 4 and the orbiting scroll 3 that constitute the compression mechanism 2, thereby enabling normal operation.

When the injection is ON, the oil only mixes with the injected refrigerant in the compression mechanism 2 in the above-described path, and there is no particular change in the flow.

FIG. 4 is a schematic cross-sectional view of the compression mechanism in the scroll compressor according to Embodiment 1. FIG. FIG. 4 shows a cross-sectional view of the compression mechanism portion 2 as viewed from the rocking base plate 3b side. For convenience of explanation, FIG. 4 shows the air bleed inlet 3ei and the air bleed outlet 3eo of the air bleed hole 3e provided in the rocking base plate 3b and the gas introduction passage 14 provided in the compliant frame 31. . Further, in order to easily distinguish between the fixed spiral body 4a and the oscillating spiral body 3a, the oscillating spiral body 3a is shaded. This point also applies to the following figures.

The compression mechanism section 2 has a so-called asymmetric spiral structure in which the spiral length of the stationary spiral body 4a and the spiral length of the swinging spiral body 3a are different. The stationary spiral body 4a is made longer than the oscillating spiral body 3a by an angle of 180 degrees around the center of the stationary spiral body 4a. When both the fixed scroll 4 and the orbiting scroll 3 are combined, the end 3f of the orbiting scroll 3a and the end 4f of the fixed scroll 4a are aligned as shown in FIG. I am doing it.

The compression chamber 2b formed by combining the fixed spiral body 4a and the oscillating spiral body 3a includes a first compression chamber 56a constituted by a room on the outward swing surface side of the oscillating spiral body 3a, and a second compression chamber 56b configured by a room on the swinging inward surface side of the body 3a. The room on the outward swinging surface side is a room formed by the outward surface 3ab of the swinging spiral body 3a of the swinging scroll 3 and the inward surface 4aa of the fixed spiral body 4a. The room on the swinging inward surface side is a room formed by the inward surface 3aa of the swinging spiral body 3a and the outward surface 4ab of the fixed spiral body 4a.

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

The bleed hole 3e communicates with the second compression chamber 56b of the compression chamber 2b. A bleed inlet 3ei of the bleed hole 3e opens to the second compression chamber 56b. The bleed hole 3 e intermittently communicates the intermediate-pressure second compression chamber 56 b during compression with the gas introduction passage 14 of the compliant frame 31 . The bleed hole 3 e intermittently communicates the intermediate pressure second compression chamber 56 b during compression with the intermediate pressure space 32 b via the gas introduction passage 14 . Here, the revolution angle range of the orbiting scroll 3 when the intermediate pressure second compression chamber 56b in the middle of compression and the intermediate pressure space 32b communicate with each other through the air bleed hole 3e is defined as an intermediate pressure bleed section. . The revolution angle is an angle about the axis of the main shaft 20 of the drive shaft 19 .

Next, the position of the injection port 4e will be explained. The injection port 4e extends from the inner side of the inward surface 4aa of the fixed spiral body 4a by the tooth thickness t of the oscillating spiral body 3a to the outer side of the oscillating spiral body 3a by the tooth thickness t from the outward surface 4ab of the fixed spiral body 4a. formed between. By forming the injection port 4e at the above position, the injection port 4e can be operated to communicate with the first compression chamber 56a and the second compression chamber 56b in different revolution angle ranges of the orbiting scroll 3. FIG. This point will be explained again.

In addition, the injection port 4e is formed at a position where it communicates with the second compression chamber 56b when the refrigerant suction is completed and the compression process is started. As a result, the injection refrigerant is supplied to the second compression chamber 56b before the supply of the injection refrigerant to the first compression chamber 56a. The reason why the injection port 4e is formed at the above position is as follows.

The compression mechanism section 2 has an asymmetric spiral structure as described above. When the compression mechanism portion 2 has an asymmetrical spiral structure, the second compression chamber 56b on the inward orbiting surface side lags behind the first compression chamber 56a on the outward orbital surface side by 180 degrees in terms of the revolution angle of the orbiting scroll 3. Compression begins. Therefore, the second compression chamber 56b rises slower in pressure than the first compression chamber 56a, and the pressure in the second compression chamber 56b at the same revolution angle is lower than the pressure 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 greater 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 greater than the pressure of the first compression chamber 56b. It is easier to supply the injection refrigerant than the compression chamber 56a. Therefore, when the refrigerant is completely sucked and the compression process is started, the second compression chamber 56b to which the injection refrigerant is easily supplied is first injected, and then the first compression chamber 56a is injected. This makes it possible to increase the amount of injection compared to the conventional configuration in which the injection refrigerant is supplied only to the first compression chamber 56a.

Also, 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 communicate with each other through the bleed hole 3e. That is, 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 bleeding section. Therefore, from the viewpoint of the inflow and outflow of the refrigerant to the second compression chamber 56b, the inflow of the injected refrigerant to the second compression chamber 56b via the injection port 4e and the bleed hole 3e from the second compression chamber 56b. and the outflow of the coolant through the outlet are not performed at the same time. Hereinafter, the inflow of injected refrigerant into the second compression chamber 56b through the injection port 4e is referred to as refrigerant injection, and the outflow of 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 section 2 will be described in detail below.

FIG. 5 is a compression process diagram showing the operation during rotation of the orbiting scroll in the scroll compressor according to Embodiment 1. FIG. FIG. 5 shows the movement of the orbiting scroll 3 from moment to moment in four stages in the order of (a) to (d). FIG. 6 is an explanatory diagram showing the operation contents (refrigerant injection and bleeding from the bleeding holes) of each compression chamber according to the revolution angle in the compression process of the scroll compressor according to Embodiment 1. FIG.

FIG. 5(a) shows a state in which the end 3f of the oscillating spiral 3a and the end 4f of the fixed spiral 4a are in the same phase. Assume that the revolution angle of the orbiting scroll 3 in this state is 0°. This state is a state in which the refrigerant is completely sucked into the first compression chamber 56a and the second compression chamber 56b and the compression process is started. In this state, the second compression chamber 56b and the injection port 4e communicate with each other, and refrigerant is injected from the injection port 4e into the second compression chamber 56b ((1) in FIG. 6).

As the orbiting scroll 3 revolves from the position shown in FIG. 5(a), the injection port 4e is blocked by the orbiting spiral body 3a, and the communication between the second compression chamber 56b and the injection port 4e ends. head to

FIG. 5(b) shows a state in which communication between the second compression chamber 56b and the injection port 4e is terminated, and communication between the first compression chamber 56a and the injection port 4e is established. In this state, refrigerant is injected from the injection port 4e into the first compression chamber 56a ((2) in FIG. 6). In the case where a plurality of injection ports 4e are formed as shown in FIG. 5, some of the plurality of injection ports 4e communicate with the first compression chamber 56a, and some of the plurality of injection ports 4e communicate with the second compression chamber 56b. There is no such thing as communicating with That is, a plurality of injection ports 4e are not simultaneously communicated with the first compression chamber 56a and the second compression chamber 56b.

FIG. 5(c) shows a state in which the air extraction outlet 3eo of the air extraction hole 3e of the rocking base plate 3b starts to communicate with the gas introduction passage 14. FIG. That is, FIG. 5(c) shows the state at the beginning of the intermediate pressure bleeding section. The revolution angle of the orbiting scroll 3 when the orbiting scroll 3 is at the position shown in FIG. 5(c) is defined as the first revolution angle. That is, the first revolution angle is the revolution angle of the orbiting scroll 3 at the start of the intermediate pressure bleeding section. When the orbiting scroll 3 is positioned at the first revolution angle, the air bleed hole 3e communicates with the gas introduction passage 14, and air is extracted from the air bleed hole 3e ((3) in FIG. 6). When the orbiting scroll 3 is positioned at the first revolution angle, the injection port 4e continues to communicate with the first compression chamber 56a from the state shown in FIG. 5(b), and refrigerant is injected into the first compression chamber 56a. ((2) in FIG. 6).

FIG. 5(d) shows the state immediately after the communication between the gas bleed outlet 3eo of the bleed hole 3e of the rocking base plate 3b and the gas introduction passage 14 is completed. The revolution angle of the orbiting scroll 3 when the orbiting scroll 3 is at the position shown in FIG. 5(d) is defined as a second revolution angle. That is, the second revolution angle is the revolution angle of the orbiting scroll 3 at the end of the intermediate pressure bleed section. When the orbiting scroll 3 is positioned at the second revolution angle, the air bleed hole 3e faces the thrust surface 33 of the compliant frame 31, and the air bleed hole 3e is blocked by the thrust surface 33. Therefore, the bleeding from the bleeding 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 to the second compression chamber 56b (Fig. 6 ( 4)). In other words, when the orbiting scroll 3 is positioned at the second revolution angle, the second compression chamber 56b switches from air extraction from the air extraction 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 section.

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 communicating with the first compression chamber 56a is blocked by the orbiting spiral body 3a, and refrigerant injection is interrupted. It is in a finished state. The compression mechanism 2 returns to the state shown in FIG. 5(a) after the state shown in FIG. 5(d).

To summarize the above series of operations, as is clear from FIG. 6, refrigerant is injected into the first compression chamber 56a and the second compression chamber 56b within ranges where the orbiting scroll 3 has different revolution angles. This is because the injection port 4e extends from the inside of the inward surface 4aa of the fixed spiral body 4a by the tooth thickness of the oscillating spiral body 3a to the outside of the outward surface 4ab of the fixed spiral body 4a by the tooth thickness of the oscillating spiral body 3a. This is due to the fact that it is formed between Since the injection port 4e is formed in the above range, the orbiting spiral body 3a moves across the injection port 4e in the radial direction during the orbital movement of the orbiting scroll 3. As shown in FIG. As a result, the injection port 4e communicates with the first compression chamber 56a or the second compression chamber 56b, and refrigerant can be injected 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 is completely sucked. 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)). will be Since the pressure of the second compression chamber 56b is lower than that of the first compression chamber 56a, the injection amount can be increased.

As described above, the first compression chamber 56a and the second compression chamber 56b have different pressures, and there is a pressure difference. Therefore, the size and shape of the injection port 4e are designed so that the first compression chamber 56a and the second compression chamber 56b are not communicated through the injection port 4e. This can prevent the refrigerant in the second compression chamber 56b from leaking into the first compression chamber 56a.

Further, in the first embodiment, while allowing refrigerant injection into both the first compression chamber 56a and the second compression chamber 56b, refrigerant injection into the second compression chamber 56b and injection from the second compression chamber 56b are allowed. is not performed at the same time as the extraction of air. If the injection of refrigerant into the second compression chamber 56b and the extraction of air from the second compression chamber 56b are performed at the same time, an excessive amount of refrigerant gas is supplied to the intermediate pressure space 32b through the extraction hole 3e and the gas introduction passage 14. be done.

When the refrigerant gas is excessively supplied to the intermediate pressure space 32b, the pressure inside the intermediate pressure space 32b increases, and an excessive pressing force is applied from the compliant frame 31 to the orbiting scroll 3. However, in the first embodiment, the injection port 4e does not communicate with the second compression chamber 56b in the intermediate pressure bleed section, and refrigerant injection into the second compression chamber 56b and air bleed from the second compression chamber 56b are performed simultaneously. will not be Therefore, it is possible to prevent the compliant frame 31 from applying an excessive pressing force to the orbiting scroll 3 . Therefore, the refrigerant can be injected 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 refrigerating capacity can be expected.

<Description of the refrigeration cycle device 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 a refrigeration cycle apparatus according to Embodiment 1. FIG.
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 decompressor 105 a and a decompressor 105 b such as electric expansion, an indoor heat exchanger 106 , and a gas-liquid separator 107 . The refrigerating cycle device 200 forms a refrigerating circuit in which these devices are sequentially connected via pipes. Outdoor heat exchanger 104 and indoor heat exchanger 106 function as condensers or evaporators by switching 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 , the condenser, the pressure reducer, the evaporator, and the gas-liquid separator 107 .

The gas-liquid separator 107 separates the inflowing two-phase refrigerant into saturated gas refrigerant and saturated liquid refrigerant. The gas-liquid separator 107 has an injection pipe 50 which is a gas outflow pipe for discharging the separated saturated gas refrigerant to the outside. A downstream end of the injection pipe 50 is connected to the scroll compressor 100 . An on-off valve 50 a for opening and closing the injection pipe 50 is connected to the injection pipe 50 .

In heating operation when the refrigeration cycle device 200 is applied to, for example, an air conditioner, the four-way switching valve 103 is connected to the solid line side in FIG. The high-temperature, high-pressure refrigerant compressed by the scroll compressor 100 flows into the indoor heat exchanger 106, where it is condensed and liquefied. After that, the two-phase refrigerant flows into the gas-liquid separator 107 . The saturated liquid refrigerant separated by the gas-liquid separator 107 passes through the pressure reducer 105a, flows to the outdoor heat exchanger 104, evaporates, and is gasified. The gasified refrigerant passes through the four-way switching valve 103 and returns to the scroll compressor 100 again. That is, in heating operation, the refrigerant circulates as indicated by the solid line arrows in FIG. Due to 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 is 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, for example, an air conditioner, the four-way switching valve 103 is connected to the dashed line side in FIG. The high-temperature and high-pressure refrigerant compressed by the scroll compressor 100 flows to the outdoor heat exchanger 104, is condensed and liquefied, and is then decompressed by the pressure reducer 105a into a low-temperature and low-pressure two-phase state. flow into The saturated liquid refrigerant separated by the gas-liquid separator 107 flows through the pressure reducer 105b to the indoor heat exchanger 106, where it evaporates and gasifies. The gasified refrigerant passes through the four-way switching valve 103 and returns to the scroll compressor 100 again. That is, in the cooling operation, the refrigerant circulates as indicated by the dashed arrows in FIG. Due to this circulation, the refrigerant exchanges heat with 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 is a condenser, exchanges heat with the outside air, and radiates heat to the outside air.

In the heating operation and cooling operation described above, the saturated gas refrigerant separated by the gas-liquid separator 107 is supplied to the scroll compressor 100 through the injection pipe 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 inflow path 4d and the injection port 4e provided in the fixed base plate 4b of the fixed scroll 4. be done. In the refrigeration cycle device 200 including the gas-liquid separator 107, the injection refrigerant is gas refrigerant, and gas injection is performed.

Although the refrigeration cycle device 200 including the gas-liquid separator 107 has been described here, the refrigeration cycle device to which the scroll compressor 100 of the present disclosure is applied is a refrigeration cycle device including the gas-liquid separator 107. Not limited. A refrigeration cycle apparatus to which the scroll compressor 100 of the present disclosure is applied does not include the gas-liquid separator 107, for example, and includes a scroll compressor, a condenser, a pressure reducer, and an evaporator. It may be a cycle device. 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 Embodiment 1 includes the compression mechanism section 2 having the fixed scroll 4 and the orbiting scroll 3 . The compression mechanism 2 is formed by combining the fixed spiral body 4a of the fixed scroll 4 and the oscillating spiral body 3a of the oscillating scroll 3 by orbiting the oscillating scroll 3 with respect to the fixed scroll 4. The refrigerant is compressed in the compression chamber 2b. The compression mechanism section 2 has an asymmetric spiral structure in which the spiral length of the fixed spiral body 4a of the fixed scroll 4 and the spiral length of the orbiting spiral body 3a of the orbiting scroll 3 are different. The fixed base plate 4b is formed with an injection port 4e for supplying the injection refrigerant to the compression chamber 2b. The compression chamber 2b includes a first compression chamber 56a formed by the outward surface 3ab of the swinging spiral body 3a and the inward surface 4aa of the fixed spiral body 4a, and the inward surface 3aa of the swinging spiral body 3a and the fixed spiral body 4a. It has a second compression chamber 56b formed with the outward surface 4ab. The injection port 4e is located between the inside of the inward surface 4aa of the fixed spiral body 4a by the tooth thickness of the oscillating spiral body 3a and the outward surface 4ab of the fixed spiral body 4a by the tooth thickness outside of the oscillating spiral body 3a. formed. Further, the injection port 4e is formed at a position that communicates with the second compression chamber 56b when the refrigerant is completely sucked.

In this way, the injection port 4e extends from the inside of the inward surface 4aa of the fixed spiral body 4a by the tooth thickness of the oscillating spiral body 3a to the outside of the outward surface 4ab of the fixed spiral body 4a by the tooth thickness of the oscillating spiral body 3a. is formed between This allows injection into both the first compression chamber 56a and the second compression chamber 56b. Further, the injection port 4e is formed at a position where it communicates with the second compression chamber 56b when the refrigerant suction 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, in the asymmetric spiral structure, injection is performed first to the second compression chamber 56b whose pressure is lower than that of the first compression chamber 56a. will be As a result, a large injection flow rate can be obtained.

In the scroll compressor 100 of Embodiment 1, the oscillating bed plate 3b has an air bleed hole 3e which is a hole penetrating from one surface on which the oscillating spiral body 3a is provided to the other surface. The bleeding hole 3e is formed between the second compression chamber 56b having an intermediate pressure higher than the refrigerant suction pressure and lower than the refrigerant discharge pressure, and between the compliant frame 31 and the guide frame 30 on the other side of the rocking plate 3b. intermittently communicates the intermediate pressure space 32b. The revolution angle range of the orbiting scroll 3 when the second compression chamber 56b and the intermediate pressure space 32b communicate with each other through the air bleed hole 3e is defined as an intermediate pressure bleed 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 orbiting scroll 3 is in the intermediate pressure bleeding section. Here, the scroll compressor 100 has a compliant frame 31 and a guide frame 30 . The intermediate pressure space 32 b is a space formed between the compliant frame 31 and the guide frame 30 . The compliant frame 31 axially supports the orbiting scroll 3 by the intermediate pressure of the refrigerant introduced into the intermediate pressure space 32b from the second compression chamber 56b through the bleed hole 3e.

Thus, 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 bleeding section. As a result, it is possible to prevent refrigerant injection into the second compression chamber 56b and bleeding from the second compression chamber 56b at the same time, and refrigerant gas is excessively supplied from the second compression chamber 56b to the intermediate pressure space 32b. can be prevented. Excessive supply of refrigerant gas to the intermediate pressure space 32b can be prevented, thereby preventing the pressure in the intermediate pressure space 32b from increasing and applying an excessive pressing force from the compliant frame 31 to the orbiting scroll 3. be able to.

In the scroll compressor 100 of Embodiment 1, the compliant frame 31 communicates with the air bleed hole 3e when the revolution angle of the orbiting scroll 3 is positioned in the intermediate pressure air bleed section, and the pressure inside the second compression chamber 56b is reduced. A gas introduction passage 14 is formed for introducing the intermediate pressure refrigerant to the intermediate pressure space 32b. Further, the compliant frame 31 is formed with a thrust surface 33 that serves as a facing surface that faces the air bleed hole 3e and blocks the air bleed hole 3e when the revolution angle of the orbiting scroll 3 is positioned outside the intermediate pressure air bleed section. It is

Thus, intermittent communication between the second compression chamber 56b and the intermediate pressure space 32b is performed by the gas introduction passage 14 and the thrust surface 33 formed in the compliant frame 31.

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

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

1 closed vessel, 2 compression mechanism, 2b compression chamber, 3 orbiting scroll, 3a orbiting spiral body, 3aa inward surface, 3ab outward surface, 3b orbiting plate, 3c boss, 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 inflow path, 4e injection port, 4f end, 5 oil reservoir Space, 6 High pressure gas atmosphere, 7 Suction pipe, 8 Suction side space, 9 Suction check valve, 10 Spring, 11 Discharge pipe, 12 Discharge port, 14 Gas introduction flow path, 15a Fixed side Oldham ring groove, 15b Oscillating side Oldham ring groove, 16 electric motor, 16a electric motor rotor, 16b electric motor stator, 18a balance weight, 18b balance weight, 19 drive shaft, 20 main shaft, 21 swing shaft, 22 counter shaft, 23 oil supply passage, 24a supply passage, 24b supply path, 25 main bearing, 26 rocking bearing, 27 auxiliary bearing, 28 thrust bearing, 29 holder, 30 guide frame, 30a upper fitting cylindrical surface, 30b lower fitting cylindrical surface, 30c flow path, 31 compliant frame, 32a compliant frame upper space, 32b intermediate pressure space, 33 thrust surface, 34 compliant frame lower end surface, 35a upper fitting cylindrical surface, 35b lower fitting cylindrical surface, 36a upper annular seal member, 36b lower annular seal member , 37 subframe, 38 boss outer space, 39a intermediate pressure adjusting valve, 39c intermediate pressure adjusting spring, 39d intermediate pressure adjusting valve space, 39e through passage, 40 Oldham ring, 41 reciprocating sliding surface, 42a fixed side key, 42b rocking side key, 50 injection pipe, 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

a fixed scroll having a fixed base plate and a fixed spiral body provided on the fixed base plate; a compression mechanism for compressing a refrigerant in a compression chamber formed by combining the fixed spiral body and the oscillating spiral body by orbiting the orbiting scroll with respect to the fixed scroll;
The compression mechanism section has an asymmetric spiral structure in which the spiral length of the fixed spiral of the fixed scroll is different from the spiral length of the oscillating spiral of the orbiting scroll, and the fixed base plate has an injection mechanism. an injection port is formed to supply refrigerant to the compression chamber,
The compression chamber includes a first compression chamber formed by the outward surface of the oscillating spiral and the inward surface of the stationary spiral, and the inward surface of the oscillating spiral and the outward surface of the stationary spiral. a second compression chamber formed;
The injection port extends from the inward surface of the fixed spiral by a tooth thickness of the orbiting spiral so as to communicate with the first compression chamber and the second compression chamber in different ranges of revolution angles of the orbiting scroll. It is formed between the inner side and the outward surface of the fixed spiral body to the outer side of the tooth thickness of the oscillating spiral body, and when the suction of the refrigerant is completed and the compression process is started, the first A scroll compressor formed at a position communicating with two compression chambers.
The oscillating base plate is a hole penetrating from one surface on which the oscillating spiral body is provided to the other surface, and has an intermediate pressure higher than the suction pressure of the refrigerant and lower than the discharge pressure. an air bleed hole intermittently communicating the second compression chamber and an intermediate pressure space formed on the other surface side of the rocking bed plate;
When the revolution 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. A scroll compressor according to claim 1, wherein said injection port is formed at a position not communicating with said second compression chamber while said orbiting scroll has an orbital angle in said intermediate pressure bleed section.
a compliant frame that abuts against the other surface of the orbiting scroll and axially supports the orbiting scroll;
a guide frame disposed on the opposite side of the compliant frame to the orbiting scroll and housing the compliant frame;
the intermediate pressure space is a space formed between the compliant frame and the guide frame;
3. The scroll according to claim 2, wherein the compliant frame supports the orbiting scroll in the axial direction by an intermediate pressure of refrigerant introduced from the second compression chamber through the bleed hole into the intermediate pressure space. compressor.
The compliant frame communicates with the bleed hole when the revolution angle of the orbiting scroll is positioned in the intermediate pressure bleed section, and allows intermediate pressure refrigerant in the second compression chamber to flow into the intermediate pressure space. An introduction passage for introducing air, and a facing surface that faces the air bleed hole and closes the air bleed hole when the orbiting scroll is positioned outside the intermediate pressure air bleed section is formed. Item 4. The scroll compressor according to item 3.
The scroll compressor according to any one of claims 1 to 4, comprising two or more injection ports.
A refrigeration cycle apparatus 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 said gas-liquid separator is supplied from said injection port of said scroll compressor to said compression chamber.