Scroll compressor and refrigeration cycle device

Abstract

The present invention provides a scroll compressor comprising: a sealed vessel; a compression mechanism part provided inside the sealed vessel and having a compression chamber in which a refrigerant is compressed as a result of fixed spiral teeth of a fixed scroll and orbiting spiral teeth of an orbiting scroll meshing with each other; a rotary shaft provided inside the sealed vessel to revolvingly drive the orbiting scroll; an electric motor provided inside the sealed vessel to rotationally drive the rotary shaft; a frame provided inside the sealed vessel to rotatably support the rotary shaft; and a supercharging mechanism provided inside the sealed vessel and having a turbine, an impeller that rotates together with the rotation of the turbine, and a coupling shaft on one end of which the turbine is coupled and on the other end of which the impeller is coupled, wherein the fixed scroll is provided with a discharge channel through which the refrigerant discharged from the compression chamber of the compression mechanism part circulates and an intake channel through which the refrigerant drawn into the sealed vessel circulates, the turbine of the supercharging mechanism is disposed in a refrigerant channel leading from the discharge channel to a discharge tube formed in the sealed vessel, the impeller of the supercharging mechanism is disposed in the intake channel, and the coupling shaft of the supercharging mechanism is rotatably supported by the frame.

Description

Scroll compressor and refrigeration cycle device

[0001] The present disclosure relates to a scroll compressor and a refrigeration cycle device, and more particularly to a scroll compressor and a refrigeration cycle device equipped with a supercharging mechanism.

[0002] Patent Document 1 discloses a configuration in which a turbine supercharger is incorporated into a compressor. The turbine supercharger in Patent Document 1 includes a casing, a motor, a rotor, rotating blades, a supercharger, a shaft, and a discharge pipe. The casing includes a main casing in which the motor, rotating blades, supercharger, and shaft are disposed, and an auxiliary casing in which the rotor is disposed. The main casing and the auxiliary casing are fixed to each other. A partition wall is provided inside the main casing. By providing the partition wall inside the main casing, a motor chamber and an accommodation chamber are formed in the main casing. A shaft is rotatably supported by the partition wall, and rotating blades accommodated in the accommodation chamber are fixed to one end of the shaft, and a supercharger accommodated in the motor chamber is fixed to the other end of the shaft.

[0003] The motor chamber houses a motor, and the auxiliary casing houses a rotor. An exhaust port in the auxiliary casing is connected to a communication hole in the main casing via a discharge pipe. The main casing is formed with a discharge hole that is connected to the communication hole and discharges compressed gas. The main casing is formed with a suction hole that is connected to the motor chamber and draws intake gas from outside the main casing.

[0004] In a turbine supercharger configured as described above, the rotor is rotated by the rotation of the motor, and gas compressed by the rotor in the sub-casing flows from the outlet of the sub-casing through the discharge pipe and into the accommodation chamber of the main casing via the communication hole. The gas flowing into the accommodation chamber of the main casing via the communication hole drives the rotating impeller to rotate, and the gas is discharged from the discharge hole of the main casing. Meanwhile, intake gas flows in through the intake hole, is pressurized by the supercharger that rotates in conjunction with the rotation of the rotating impeller, and is then drawn into the sub-casing at a high density.

[0005] Japanese Unexamined Patent Publication No. 51-3445

[0006] The turbocharger of Patent Document 1 is configured such that gas compressed by the rotor is introduced through a discharge pipe provided outside the main casing and is sprayed onto the rotating blades. As a result, pressure loss occurs as the gas compressed by the rotor passes through the discharge pipe, making it impossible to rotate the rotating blades efficiently.

[0007] An object of the present disclosure is to provide a scroll compressor and a refrigeration cycle device in which the efficiency of power recovery by a supercharging mechanism is improved.

[0008] A scroll compressor according to the present disclosure includes: a sealed container; a compression mechanism section provided inside the sealed container and having a compression chamber in which a refrigerant is compressed by meshing of fixed spiral teeth of a fixed scroll and oscillating spiral teeth of an oscillating scroll; a rotating shaft provided inside the sealed container and driving the oscillating scroll to orbit; an electric motor provided inside the sealed container and driving the rotating shaft to rotate; a frame provided inside the sealed container and rotatably supporting the rotating shaft; a turbine and an impeller provided inside the sealed container and rotating with the rotation of the turbine; the fixed scroll is provided with a discharge flow path through which the refrigerant discharged from the compression chamber of the compression mechanism flows, and a suction flow path through which the refrigerant drawn into the sealed container flows, the turbine of the supercharging mechanism is disposed in the refrigerant flow path from the discharge flow path to a discharge pipe formed in the sealed container, the impeller of the supercharging mechanism is disposed in the suction flow path, and the connecting shaft of the supercharging mechanism is rotatably supported by the frame.

[0009] In addition, the refrigeration cycle device according to the present disclosure includes the above-mentioned scroll compressor, a condenser in which the refrigerant compressed by the scroll compressor dissipates heat, a pressure reducer that reduces the pressure of the refrigerant flowing out of the condenser, and an evaporator in which the refrigerant flowing out of the pressure reducer evaporates.

[0010] In the scroll compressor and refrigeration cycle device according to the present disclosure, the turbine of the supercharging mechanism is provided in the discharge flow path, the impeller that rotates with the rotation of the turbine is provided in the suction flow path, and the connecting shaft is supported by a frame, thereby reducing pressure loss and improving the efficiency of power recovery by the supercharging mechanism.

[0011] FIG. 1 is a longitudinal cross-sectional view of a scroll compressor according to embodiment 1 of the present disclosure. FIG. 2 is a transverse cross-sectional view of a guide frame of the scroll compressor according to embodiment 1 of the present disclosure. FIG. 3 is a longitudinal cross-sectional view of a rotor of an electric motor of the scroll compressor according to embodiment 1 of the present disclosure. FIG. 4 is a transverse cross-sectional view of a rotor of an electric motor of the scroll compressor according to embodiment 1 of the present disclosure. FIG. 5 is a transverse cross-sectional view of a stator of an electric motor of the scroll compressor according to embodiment 1 of the present disclosure. FIG. 6 is a side view of a supercharging mechanism of the scroll compressor according to embodiment 1 of the present disclosure. FIG. 7 is a longitudinal cross-sectional view showing a case where a supercharging mechanism is mounted on the scroll compressor according to embodiment 1 of the present disclosure. FIG. 8 is a schematic configuration diagram of a refrigeration cycle device including a scroll compressor according to embodiment 1 of the present disclosure.

[0012] Embodiments of the present disclosure will be described below with reference to the drawings. The present disclosure is not limited to the following embodiments and can be modified in various ways without departing from the spirit and scope of the present disclosure. Furthermore, the present disclosure includes all possible combinations of the configurations shown in the following embodiments. In particular, the combinations of components are not limited to those in each embodiment; components described in one embodiment can be applied to another embodiment. The configurations shown in the drawings are merely examples of the configurations of the present disclosure, and the present disclosure is not limited to the configurations shown in the drawings. In the following description, directional terms (e.g., "up," "down," "right," "left," "front," "rear," etc.) are used as appropriate to facilitate understanding, but these are for explanatory purposes and do not limit the present disclosure. In each drawing, components designated with the same reference numerals are identical or equivalent, and this applies throughout the entire specification. The relative dimensional relationships or shapes of the components in each drawing may differ from those in actuality.

[0013] Embodiment 1. <Scroll compressor 100> Fig. 1 is a vertical cross-sectional view of a scroll compressor 100 according to embodiment 1 of the present disclosure. The configuration and operation of a vertically mounted scroll compressor 100 will be described with reference to Fig. 1. The scroll compressor 100 is one of the components of a refrigeration cycle used in various industrial machines, such as a refrigerator, a freezer, an air conditioner, a refrigeration device, or a water heater.

[0014] First, the basic configuration of the scroll compressor 100 will be described, followed by a description of its characteristic features. The scroll compressor 100 draws in refrigerant circulating through a refrigeration cycle, compresses it, and discharges it in a high-temperature, high-pressure state. The scroll compressor 100 includes a compression mechanism 14 inside a sealed container 10, which combines a fixed scroll 1 and an orbiting scroll 2 that revolves and orbits relative to the fixed scroll 1. The scroll compressor 100 also includes an electric motor 5 inside the sealed container 10, which is connected to the orbiting scroll 2 by a main shaft 6 and drives the orbiting scroll 2. In the case of a vertically mounted scroll compressor 100, for example, the compression mechanism 14 is located on the upper side and the electric motor 5 is located on the lower side inside the sealed container 10.

[0015] <Sealed Container 10> The sealed container 10 is formed of a conductive material such as metal and includes a cylindrical side wall 10a, a first end wall 10b that closes an opening at one end of the side wall 10a, and a second end wall 10c that closes an opening at the other end of the side wall 10a. In the case of a vertical scroll compressor 100, the first end wall 10b closes the upper end of the side wall 10a, and the second end wall 10c closes the lower end of the side wall 10a. The side wall 10a is provided with a suction pipe 13 through which low-pressure refrigerant drawn from an external refrigerant piping flows and is drawn into the sealed container 10, and a discharge pipe 12 through which high-temperature, high-pressure refrigerant flows inside the sealed container 10 and is discharged. The suction pipe 13 and the discharge pipe 12 are fixed to the sealed container 10 by, for example, welding, with portions inserted into the sealed container 10.

[0016] <Fixed Scroll 1> The fixed scroll 1 is composed of a base plate portion 1a and a fixed spiral tooth 1b provided on one of the lower surfaces of the base plate portion 1a. The fixed spiral tooth 1b is a spiral projection protruding from the base plate portion 1a and meshes with the orbiting spiral tooth 2b of the orbiting scroll 2 to form a compression chamber 1f.

[0017] The fixed scroll 1 has an outer periphery fastened to the guide frame 4 with bolts (not shown). A suction passage 1e is provided on the outer periphery of the base plate 1a of the fixed scroll 1. The suction passage 1e is formed to extend radially of the fixed scroll 1. The suction passage 1e is a passage for introducing refrigerant gas sucked through a suction pipe 13 into a compression chamber 1f. The tip of the suction pipe 13 is disposed in the suction passage 1e. For example, a suction check valve may be provided in the suction passage 1e. A discharge passage 1d is formed in the center of the base plate 1a of the fixed scroll 1, through which compressed, high-pressure refrigerant gas is discharged. The compressed, high-pressure refrigerant gas that has flowed through the discharge passage 1d is discharged into an upper space 20 inside the sealed container 10. The refrigerant gas discharged into the upper space 20 passes through a first passage 4f provided in the guide frame 4 and is guided to an oil separation mechanism formed in the lower part of the sealed container 10. The refrigerant gas from which the oil has been separated is discharged from the discharge pipe 12 and circulates through the refrigeration cycle device 200 .

[0018] <Oscillating Scroll 2> The oscillating scroll 2 is composed of a base plate portion 2 a and an oscillating spiral tooth 2 b provided on one of the upper surfaces of the base plate portion 2 a. The oscillating spiral tooth 2 b has a spiral protrusion of substantially the same shape as the fixed spiral tooth 1 b of the fixed scroll 1, and the volume of the compression chamber 1 f changes relatively when the oscillating spiral tooth 2 b meshes with the fixed spiral tooth 1 b.

[0019] The Oldham mechanism 9 prevents the orbiting scroll 2 from rotating about its axis, allowing it to revolve, i.e., perform an orbiting motion, without rotating about its axis relative to the fixed scroll 1. The Oldham mechanism 9 has a pair of fixed-side keys 9a and a pair of orbiting-side keys 9b.

[0020] The fixed-side keys 9a are engaged so as to be reciprocatable with a pair of Oldham guide grooves 1c formed in the fixed scroll 1. The Oldham guide grooves 1c of the fixed scroll 1 are formed in a substantially straight line on the outer periphery of the base plate 1a. The swing-side keys 9b are engaged so as to be reciprocatable with a pair of Oldham guide grooves 2c formed in the swing scroll 2. The Oldham guide grooves 2c of the swing scroll 2 are formed in a substantially straight line on the outer periphery of the base plate 2a with a phase difference of 90 degrees with the Oldham guide grooves 1c of the fixed scroll 1. The Oldham mechanism 9 enables the swing scroll 2 to perform swing motion without rotating on its axis, i.e., swing motion.

[0021] A hollow cylindrical boss portion 2d is formed on the other surface of the base plate portion 2a of the orbiting scroll 2. The other surface of the base plate portion 2a is the lower surface, opposite the surface on which the orbiting spiral teeth 2b are formed. An eccentric shaft portion 6a, which is an orbiting shaft portion provided at the upper end of a main shaft 6 that is rotationally driven by a rotor 5a of an electric motor 5, is inserted into the boss portion 2d.

[0022] The other surface of the base plate portion 2a of the orbiting scroll 2 is a thrust surface 2f. The thrust surface 2f is a surface that can slide on the thrust bearing 3a of the compliant frame 3 while being in pressure contact with the thrust bearing 3a.

[0023] An air bleed hole 2g that penetrates the base plate portion 2a and connects the compression chamber 1f to the thrust surface 2f is provided in the base plate portion 2a of the orbiting scroll 2. The air bleed hole 2g is configured to extract refrigerant gas during compression and guide it to the thrust surface 2f.

[0024] <Compliant Frame 3> The compliant frame 3 is housed inside the guide frame 4. An upper cylindrical surface 3p and a lower cylindrical surface 3s are provided on the outer periphery of the compliant frame 3. The upper cylindrical surface 3p and the lower cylindrical surface 3s of the compliant frame 3 are fitted with an upper cylindrical surface 4c and a lower cylindrical surface 4d, respectively, provided on the inner periphery of the guide frame 4. The upper cylindrical surface 3p and the lower cylindrical surface 3s of the compliant frame 3 are fitted with the upper cylindrical surface 4c and the lower cylindrical surface 4d of the guide frame 4, respectively, so that the compliant frame 3 is supported in the radial direction inside the guide frame 4.

[0025] A main bearing 3c and an auxiliary main bearing 3d are provided in the center of the lower cylindrical surface 3s of the compliant frame 3. The main bearing 3c and the auxiliary main bearing 3d are portions that radially support a main shaft 6 that is rotationally driven by a rotor 5a of the electric motor 5. A thrust bearing 3a is provided in the center at the upper end of the upper cylindrical surface 3p of the compliant frame 3 so as to face a thrust surface 2f of the orbiting scroll 2.

[0026] The compliant frame 3 is provided with a communication hole 3e that axially penetrates the compliant frame 3 from within the surface of the thrust bearing 3a. The communication hole 3e opens at a thrust bearing opening 3t at the upper end. The thrust bearing opening 3t is disposed opposite an air bleed hole 2g that penetrates the base plate 2a of the orbiting scroll 2.

[0027] The outer periphery of the thrust bearing 3a of the compliant frame 3 forms a reciprocating sliding surface 3b on which the Oldham mechanism annular portion 9c reciprocates. The reciprocating sliding surface 3b connects a communication hole 3f, which connects the base plate outer periphery space 2k and the frame upper space 4a, to the inside of the Oldham mechanism annular portion 9c.

[0028] An intermediate pressure regulating valve space 3n in which an intermediate pressure regulating valve 3g, an intermediate pressure regulating valve holder 3h, and an intermediate pressure regulating spring 3k that adjust the pressure in the boss outer space 2n are accommodated and shortened from their natural lengths is provided in the compliant frame 3. The intermediate pressure regulating valve 3g, the intermediate pressure regulating valve holder 3h, and the intermediate pressure regulating valve space 3n are provided between the frame upper space 4a and the boss outer space 2n.

[0029] <Guide Frame 4> The inner surface of the guide frame 4 and the outer surface of the compliant frame 3 form a lower frame space 4b. The lower frame space 4b is partitioned by an upper seal member 7a and a lower seal member 7b, which are ring-shaped and arranged above and below each other. Two ring-shaped seal grooves are formed on the inner peripheral surface of the guide frame 4 to accommodate the upper seal member 7a and the lower seal member 7b. The seal grooves may be formed on the outer peripheral surface of the compliant frame 3 instead of on the inner peripheral surface of the guide frame 4.

[0030] The frame lower space 4b communicates only with the communication hole 3e of the compliant frame 3, and is structured to enclose the refrigerant gas being compressed and supplied through the bleed hole 2g. The space on the outer periphery of the thrust bearing 3a, which is surrounded on the top and bottom by the base plate 2a of the orbiting scroll 2 and the compliant frame 3, i.e., the base plate outer periphery space 2k, is an intake gas atmosphere and is a low-pressure space of intake pressure.

[0031] The compliant frame 3 and the guide frame 4 may be configured as separate bodies, or the compliant frame 3 and the guide frame 4 may be configured as a single, integrated frame.

[0032] <First Passage 4f of Guide Frame 4> Figure 2 is a cross-sectional view of the guide frame 4 of the scroll compressor 100 according to the first embodiment of the present disclosure. As shown in Figure 2, the outer peripheral surface of the guide frame 4 is fixed to the sealed container 10 by shrink fitting, welding, or the like. A first passage 4f formed by a notch is provided in the outer peripheral portion of the guide frame 4 and the fixed scroll 1, i.e., the compression mechanism 14. Refrigerant gas discharged from the discharge flow path 1d into the upper space 20 of the sealed container 10 passes through the first passage 4f and flows downward within the sealed container 10. The bottom of the sealed container 10 forms an oil reservoir 21 in which refrigeration oil 11 is stored.

[0033] The first passage 4f is provided at a position opposite to the discharge pipe 12 through which refrigerant gas is discharged from the sealed container 10 to the outside. The space extending from the center of the lower end of the guide frame 4 to the side surface of the guide frame 4 forms a first discharge passage 4g that communicates with the discharge pipe 12. A discharge cover 16 having an opening 16b that surrounds the lower cylindrical surface 4d is provided at the lower end of the guide frame 4. A second discharge passage 16a within the discharge cover 16 connects the first discharge passage 4g and the discharge pipe 12.

[0034] <Motor 5> The motor 5 drives the main shaft 6 to rotate, and is composed of the main shaft 6 which is a rotating shaft, a rotor 5a fixed to the main shaft 6, and a stator 5b fixed to the sealed container 10.

[0035] <Main shaft 6> The main shaft 6 is driven to rotate when current is applied to the stator 5b. The rotor 5a is fixed to the main shaft 6 by, for example, shrink fitting. An eccentric shaft portion 6a is formed at the upper end of the main shaft 6, and is rotatably engaged with the swing bearing 2e of the swing scroll 2. A main shaft balance weight 6f is fixed to the lower side of the eccentric shaft portion 6a by, for example, shrink fitting.

[0036] A main shaft portion 6b is provided below the eccentric shaft portion 6a and is rotatably engaged with the main bearing 3c and auxiliary main bearing 3d of the compliant frame 3. A counter shaft portion 6c is formed at the lower end of the main shaft 6 and is rotatably engaged with an auxiliary bearing 8a of a sub-frame 8 provided at the bottom of the sealed container 10. The sub-frame 8 is provided with an inlet hole 8b through which refrigerating machine oil 11 flows into an oil reservoir 21.

[0037] The rotor 5a of the electric motor 5 is fixed between the countershaft 6c and the main shaft 6b, for example, by shrink fitting. The main shaft 6 is provided with an oil supply passage 6d consisting of a hole penetrating in the axial direction. An oil supply port 6e at the lower end of the oil supply passage 6d is immersed in refrigerant oil 11 stored at the bottom of the sealed container 10. An oil supply mechanism or pump mechanism (not shown) is provided at the bottom of the main shaft 6, and refrigerant oil 11 is sucked up from the oil supply port 6e. The upper end of the oil supply passage 6d opens into the boss portion 2d of the orbiting scroll 2. The refrigerant oil 11 sucked up by the oil supply mechanism or pump mechanism flows from the opening at the upper end of the oil supply passage 6d to the rocking bearing 2e, lubricating the eccentric shaft portion 6a and the rocking bearing 2e. An oil supply hole 6g branching out laterally is provided in the oil supply passage 6d, and refrigeration oil 11 is supplied to the auxiliary main bearing 3d through the oil supply hole 6g to lubricate the auxiliary main bearing 3d and the main shaft portion 6b. Note that the oil supply hole for the main bearing 3c is not shown in Figure 1.

[0038] A first balance weight 15a is fixed to the upper end surface of the rotor 5a. A second balance weight 15b is fixed to the lower end surface of the rotor 5a. The first balance weight 15a and the second balance weight 15b are fixed at diagonally eccentric positions, respectively. The first balance weight 15a and the second balance weight 15b, together with the main shaft balance weight 6f, offset the centrifugal force and moment force generated when the orbiting scroll 2 orbits via the eccentric shaft portion 6a of the main shaft 6. The first balance weight 15a, the second balance weight 15b, and the main shaft balance weight 6f ensure static and dynamic balance of the scroll compressor 100.

[0039] A first cup-shaped member 17 containing a first balance weight 15a is fixed to the upper end surface of the rotor 5a, and a second cup-shaped member 18 containing a second balance weight 15b is fixed to the lower end surface of the rotor 5a. An upper opening 17a of the first cup-shaped member 17 faces the opening 16b of the discharge cover 16. The second cup-shaped member 18 is attached with its opening 18a facing downward.

[0040] <Rotor 5a> Figure 3 is a longitudinal cross-sectional view of the rotor 5a of the electric motor 5 of the scroll compressor 100 according to the first embodiment of the present disclosure. Figure 4 is a transverse cross-sectional view of the rotor 5a of the electric motor 5 of the scroll compressor 100 according to the first embodiment of the present disclosure. As shown in Figures 3 and 4, the rotor 5a is provided with a plurality of through-flow passages 5f that penetrate therethrough in the axial direction.

[0041] The through-flow passages 5f are provided by penetrating the bottoms of the first cup-shaped member 17 and the second cup-shaped member 18 to avoid the installation positions of the first balance weight 15a and the second balance weight 15b. The multiple through-flow passages 5f are formed symmetrically with respect to the axis or point-symmetrically. It is preferable that the first cup-shaped member 17 and the second cup-shaped member 18 are made of a non-magnetic material. The through-flow passages 5f may be formed by penetrating the first balance weight 15a and the second balance weight 15b, or may be provided by avoiding the positions of the first cup-shaped member 17 and the second cup-shaped member 18.

[0042] <Stator 5b> Figure 5 is a cross-sectional view of the stator 5b of the electric motor 5 of the scroll compressor 100 according to the first embodiment of the present disclosure. As shown in Figure 5, the outer peripheral surface of the stator 5b of the electric motor 5 is fixed to the sealed container 10 by shrink fitting, welding, or the like. A second passage 5g formed by a notch is provided in the outer peripheral portion of the stator 5b. The second passage 5g, together with the first passage 4f, constitutes the refrigerant flow path 30 that guides the refrigerant gas discharged from the discharge flow path 1d to the bottom of the sealed container 10.

[0043] A glass terminal 22 is provided on the side surface of the sealed container 10, and the glass terminal 22 and the stator 5b of the electric motor 5 are connected by a lead wire 5h. The above is the basic configuration of the scroll compressor 100.

[0044] <Supercharging mechanism 300> Figure 6 is a side view of the supercharging mechanism 300 of the scroll compressor 100 according to the first embodiment of the present disclosure. As shown in Figure 6, the supercharging mechanism 300 has a connecting shaft 301a, a turbine 301c provided at one end of the connecting shaft 301a, and an impeller 301b provided at the other end of the connecting shaft 301a.

[0045] The turbine 301c has a turbine blade group 301ca consisting of a plurality of blades, and causes the refrigerant that has flowed in from the centrifugal direction to flow out in the axial direction. The impeller 301b has an impeller blade group 301ba consisting of a plurality of blades, and causes the refrigerant that has flowed in from the axial direction to flow out in the centrifugal direction.

[0046] The supercharging mechanism 300 is made of, for example, iron or aluminum. The supercharging mechanism 300 may also be made of resin or the like. For example, if the scroll compressor 100 has dimensions of 400 mm in length and 170 mm in width, the supercharging mechanism 300 has a turbine 301c and impeller 301b with a diameter of 10 mm and a connecting shaft 301a with a length of 30 mm.

[0047] <Scroll compressor 100 equipped with supercharging mechanism 300> Figure 7 is a longitudinal cross-sectional view showing a case where supercharging mechanism 300 is equipped in scroll compressor 100 according to embodiment 1 of the present disclosure. As shown in Figure 7, supercharging mechanism 300 is equipped in scroll compressor 100 according to embodiment 1. Supercharging mechanism 300 is provided such that connecting shaft 301a penetrates guide frame 4, discharge pipe 12, and suction pipe 13. Turbine 301c is mounted inside discharge pipe 12, and impeller 301b is mounted inside suction pipe 13. Supercharging mechanism 300 is rotatable about connecting shaft 301a as a central axis in guide frame 4, discharge pipe 12, and suction pipe 13.

[0048] <First flow straightening block 302a and second flow straightening block 302b> In order to maximize the effect of the supercharging mechanism 300, a first flow straightening block 302a and a second flow straightening block 302b are provided inside the intake pipe 13. The first flow straightening block 302a is disposed upstream of the impeller 301b and in the centrifugal direction of the impeller 301b. The second flow straightening block 302b is disposed downstream of the impeller 301b and such that its upstream end faces the connecting shaft 301a.

[0049] The first flow rectifying block 302a causes the refrigerant to flow into the impeller blade set 301ba from the axial direction of the impeller 301b, and the second flow rectifying block 302b causes the refrigerant to flow out from the impeller blade set 301ba in the centrifugal direction of the impeller 301b. The provision of the first flow rectifying block 302a and the second flow rectifying block 302b improves the rotation efficiency of the impeller 301b.

[0050] <Operation of Scroll Compressor 100> When the scroll compressor 100 is started up or in operation, refrigerant is drawn into the suction pipe 13 and is sucked into the impeller 301b through a gap between the first flow straightening block 302a and the suction pipe 13. The refrigerant is actively sent into the compression chamber 1f of the scroll compressor 100 by the power of a turbine 301c (described later). The compression chamber 1f is formed by the fixed spiral teeth 1b of the fixed scroll 1 and the orbiting spiral teeth 2b of the orbiting scroll 2 meshing with each other.

[0051] The orbiting scroll 2 driven by the electric motor 5 performs a compression stroke in which the volume of the compression chamber 1f is reduced as the scroll 2 eccentrically orbits, thereby compressing the sucked refrigerant to a high pressure. During the compression stroke, intermediate-pressure refrigerant gas is guided from the bleed hole 2g of the orbiting scroll 2 through the communication hole 3e of the compliant frame 3 to the frame lower space 4b, thereby maintaining an intermediate-pressure atmosphere in the frame lower space 4b.

[0052] The refrigerant that has undergone the compression stroke becomes highly pressurized and is discharged as a mixed gas together with refrigerating machine oil 11 from the discharge passage 1d of the fixed scroll 1, and is guided to the upper space 20 of the sealed container 10. The mixed gas passes through a refrigerant passage 30 consisting of a first passage 4f provided on the outer periphery of the compression mechanism 14 and a second passage 5g provided on the outer periphery of the stator 5b of the electric motor 5, and is guided to the space below the electric motor 5, i.e., to the bottom of the sealed container 10. The mixed gas is separated during the process of being guided to the bottom of the sealed container 10. The refrigerant gas separated from the refrigerating machine oil 11 enters the interior through an opening 18a of a second cup-shaped member 18 attached to the lower end surface of the rotor 5a of the electric motor 5, and flows into a through passage 5f provided in the rotor 5a.

[0053] The refrigerant gas that has flowed into the through-flow passage 5f rises inside the first cup-shaped member 17 attached to the upper end surface of the rotor 5a and flows into the inside of the discharge cover 16. The refrigerant gas that has flowed into the inside of the discharge cover 16 passes through the second discharge passage 16a inside the discharge cover 16 and the first discharge passage 4g to reach the discharge pipe 12.

[0054] The refrigerant gas that reaches the discharge pipe 12 rotates the turbine 301c provided in the discharge pipe 12. The rotation of the turbine 301c rotates the connecting shaft 301a, which in turn rotates the impeller 301b. The rotation of the impeller 301b actively draws the refrigerant from the suction pipe 13 into the impeller 301b. As a result, the refrigerant is actively sucked in, i.e., the refrigerant is supercharged, increasing the capacity of the scroll compressor 100 and making it possible to reduce the amount of work per rotation of the orbiting scroll 2. The mixed gas that rotates the turbine 301c is released from the discharge pipe 12 to the outside of the sealed container 10.

[0055] In this way, the supercharging mechanism 300 uses the pressure energy of the refrigerant discharged from the discharge passage 1 d to the outside of the compression chamber 1 f to rotate the impeller 301 b, thereby promoting the flow of refrigerant through the suction passage 1 e. As a result, the refrigerant is supercharged to the compression chamber 1 f, the capacity of the scroll compressor 100 is increased, and the amount of work per rotation of the orbiting scroll 2 can be reduced.

[0056] In particular, power recovery by the supercharging mechanism 300 is performed by rotating the turbine 301c with the refrigerant that is discharged from the discharge passage 1d provided in the fixed scroll 1 inside the sealed container 10 and reaches the discharge pipe 12. Therefore, pressure loss in the refrigerant is reduced compared to when the refrigerant is guided to the turbine 301c via a pipe provided outside the sealed container 10, and power recovery can be performed efficiently.

[0057] 8 is a schematic configuration diagram of a refrigeration cycle apparatus 200 including the scroll compressor 100 according to the first embodiment of the present disclosure. In Fig. 8, dashed arrows indicate the flow of refrigerant during cooling operation, and solid arrows indicate the flow of refrigerant during heating operation.

[0058] As shown in FIG. 8 , the scroll compressor 100 is connected to, for example, an air conditioner as a refrigeration cycle apparatus 200. In the refrigeration cycle apparatus 200, a suction muffler 101 of the scroll compressor 100 is connected to the suction side of the scroll compressor 100, and a four-way switching valve 103 is connected to the discharge side of the scroll compressor 100. The four-way switching valve 103 switches the flow of refrigerant flowing out of the scroll compressor 100. The refrigeration cycle apparatus 200 further includes an outdoor heat exchanger 104, a pressure reducer 105 such as an electric expansion valve, and an indoor heat exchanger 106. These components are sequentially connected via piping to form a refrigeration circuit. Generally, in a refrigeration air-conditioning apparatus such as the refrigeration cycle apparatus 200, the indoor heat exchanger 106 is installed indoors, and the remaining components, the scroll compressor 100, the four-way switching valve 103, the outdoor heat exchanger 104, and the pressure reducer 105, are installed outdoors.

[0059] For example, during heating operation of the air conditioner, the four-way selector valve 103 is switched so that the refrigerant flows in the direction indicated by the solid arrow. The high-temperature, high-pressure refrigerant compressed by the scroll compressor 100 flows to the indoor heat exchanger 106, where it condenses and liquefies. After that, it is throttled by the pressure reducer 105, where it becomes a two-phase refrigerant of low temperature and low pressure, and flows to the outdoor heat exchanger 104. The refrigerant that flows to the outdoor heat exchanger 104 evaporates and gasifies in the outdoor heat exchanger 104, and returns to the scroll compressor 100 through the four-way selector valve 103.

[0060] As the refrigerant circulates through the refrigeration circuit, it exchanges heat with outside air in outdoor heat exchanger 104, which serves as an evaporator, and is sent to outdoor heat exchanger 104, where it absorbs heat. The refrigerant that has absorbed heat in outdoor heat exchanger 104 is sent to indoor heat exchanger 106, which serves as a condenser, and exchanges heat with indoor air, thereby warming the indoor air.

[0061] In cooling operation, the four-way switching valve 103 is switched so that the refrigerant flows in the direction indicated by the dashed arrow. The high-temperature, high-pressure refrigerant compressed by the scroll compressor 100 flows to the outdoor heat exchanger 104, where it condenses and liquefies. After being throttled by the pressure reducer 105, the refrigerant becomes a two-phase refrigerant of low temperature and low pressure, and flows to the indoor heat exchanger 106. The refrigerant that flows to the indoor heat exchanger 106 evaporates and gasifies, and returns to the scroll compressor 100 via the four-way switching valve 103. In other words, when the operation switches from heating to cooling, the indoor heat exchanger 106 changes from a condenser to an evaporator, and the outdoor heat exchanger 104 changes from an evaporator to a condenser.

[0062] The refrigerant circulates through the refrigeration circuit and exchanges heat with the indoor air in the indoor heat exchanger 106, which serves as an evaporator, absorbing heat from the indoor air, thereby cooling the indoor air. The refrigerant that has absorbed heat from the indoor air is sent to the outdoor heat exchanger 104, which serves as a condenser, and exchanges heat with the outside air, releasing heat to the outside.

[0063] The refrigerant used in the refrigeration cycle apparatus 200 may be a fluorine-based refrigerant or a hydrocarbon-based refrigerant with a low global warming potential (GWP). Examples of the refrigerant include a single refrigerant such as R1234yf, R1234ze, R32, or R290, a mixed refrigerant containing two or more of these, or a mixed refrigerant containing one of these with another refrigerant. Examples of the refrigerant include a mixed refrigerant containing R1132(E) or a mixed refrigerant containing R1123. Examples of refrigerants include mixed refrigerants of R516A, R445A, R444A, R454C, R444B, R454A, R455A, R457A, R459B, R452B, R454B, R447B, R447A, R446A, R459A, and R410A.

[0064] The scroll compressor 100 according to the first embodiment described above includes a supercharging mechanism 300 disposed inside the sealed container 10. The supercharging mechanism 300 includes a turbine 301c rotated by the refrigerant discharged from the discharge passage 1d, an impeller 301b that promotes the flow of refrigerant through the suction passage 1e, and a connecting shaft 301a rotatably supported by the guide frame 4. When the main shaft 6 is driven to rotate by the electric motor 5, the orbiting scroll 2 is driven to orbit, and the refrigerant is compressed in a compression chamber 1f formed by the fixed spiral teeth 1b of the fixed scroll 1 and the orbiting spiral teeth 2b of the orbiting scroll 2 meshing with each other, and the refrigerant is discharged from the discharge passage 1d of the fixed scroll 1. The refrigerant discharged to the outside of the compression chamber 1f through the discharge passage 1d reaches the discharge pipe 12 and rotates the turbine 301c of the supercharging mechanism 300. When the turbine 301c rotates, the impeller 301b rotates accordingly. The rotation of the impeller 301b promotes the flow of refrigerant drawn through the suction pipe 13 and through the suction passage 1e. By using the pressure energy of the refrigerant to rotate the impeller 301b, the flow of refrigerant through the suction passage 1e is promoted, and the refrigerant is supercharged to the compression chamber 1f, thereby increasing the capacity of the scroll compressor 100. Furthermore, by increasing the pressure in the compression chamber 1f, the workload per rotation of the orbiting scroll 2 can be reduced. In particular, power recovery by the supercharging mechanism 300 is achieved by rotating the turbine 301c with the refrigerant flowing from the discharge passage 1d of the fixed scroll 1 to the discharge pipe 12 extending through the sealed container 10. Thus, the supercharging mechanism 300 of the first embodiment is provided inside the sealed container 10, and the turbine 301c inside the sealed container 10 recovers the power of the refrigerant flowing through the sealed container 10. Therefore, compared to when gas is guided to the turbine 301c via a discharge pipe provided outside the sealed container 10 to recover power, pressure loss is reduced and power recovery can be performed efficiently.

[0065] The turbine 301c has a turbine blade group 301ca consisting of multiple blades that allow the refrigerant to flow in from the centrifugal direction, and the impeller 301b has an impeller blade group 301ba consisting of multiple blades that allow the refrigerant to flow in from the axial direction and out from the centrifugal direction. The turbine blade group 301ca allows the refrigerant flowing in from the centrifugal direction of the turbine 301c to rotate the turbine 301c. Furthermore, because the turbine blade group 301ca of the turbine 301c is configured to allow the refrigerant to flow in from the centrifugal direction, if a discharge valve is provided in the scroll compressor 100, the discharge valve can be positioned in the centrifugal direction of the turbine 301c. This allows the flow of refrigerant after discharge to actively rotate the turbine 301c. Furthermore, by having the impeller blade group 301ba, it becomes possible to position the compression chamber 1f in the centrifugal direction of the impeller 301b, and the refrigerant that has gained momentum by the impeller 301b can be actively guided into the compression chamber 1f, which is expected to have a supercharging effect.

[0066] Furthermore, even in the scroll compressor 100 configured such that the suction pipe 13 penetrates and is inserted into the side wall 10a of the sealed container 10, a configuration including the supercharging mechanism 300 can be realized.

[0067] Furthermore, impeller 301b is disposed inside suction pipe 13, and first flow straightening block 302a and second flow straightening block 302b are disposed inside suction pipe 13. First flow straightening block 302a facilitates the refrigerant to flow axially into impeller blade set 301ba, and second flow straightening block 302b facilitates the refrigerant to flow out of impeller blade set 301ba in the centrifugal direction, thereby improving the rotational efficiency of impeller 301b.

[0068] 1 Fixed scroll, 1a Base plate portion, 1b Fixed spiral tooth, 1c Oldham guide groove, 1d Discharge flow path, 1e Suction flow path, 1f Compression chamber, 2 Oscillating scroll, 2a Base plate portion, 2b Oscillating spiral tooth, 2c Oldham guide groove, 2d Boss portion, 2e Oscillating bearing, 2f Thrust surface, 2g Bleed hole, 2k Base plate outer peripheral space, 2n Boss portion outer space, 3 Compliant frame, 3a Thrust bearing, 3b Reciprocating sliding surface, 3c Main bearing, 3d Auxiliary main bearing, 3e Communication hole, 3f Communication hole, 3g Intermediate pressure adjustment valve, 3h Intermediate pressure adjustment valve holder, 3k Intermediate pressure adjustment spring, 3n Intermediate pressure adjustment valve space, 3p Upper cylindrical surface, 3s Lower cylindrical surface, 3t Thrust bearing opening, 4 Guide frame, 4a Frame upper space, 4b Frame lower space, 4c Upper cylindrical surface, 4d lower cylindrical surface, 4f first passage, 4g first discharge passage, 5 electric motor, 5a rotor, 5b stator, 5f through passage, 5g second passage, 5h lead wire, 6 main shaft, 6a eccentric shaft portion, 6b main shaft portion, 6c counter shaft portion, 6d oil supply passage, 6e oil supply port, 6f main shaft balance weight, 6g oil supply hole, 7a upper seal material, 7b lower seal material, 8 subframe, 8a counter bearing, 8b inlet hole, 9 Oldham mechanism, 9a fixed side key, 9b swing side key, 9c Oldham mechanism annular portion, 10 sealed container, 10a side wall, 10b first end wall, 10c second end wall, 11 refrigerating machine oil, 12 discharge pipe, 13 suction pipe, 14 compression mechanism portion, 15a first balance weight, 15b Second balance weight, 16 Discharge cover, 16a Second discharge passage, 16b Opening, 17 First cup-shaped member, 17a Opening, 18 Second cup-shaped member, 18a Opening, 20 Upper space, 21 Oil reservoir, 22 Glass terminal, 30 Refrigerant flow path, 100 Scroll compressor, 101 Intake muffler, 103 Four-way switching valve, 104 Outdoor heat exchanger, 105 Pressure reducer, 106 Indoor heat exchanger, 200 Refrigeration cycle device, 300 Supercharging mechanism, 301a Connecting shaft, 301b Impeller, 301ba Impeller blade group, 301c Turbine, 301ca Turbine blade group, 302a First straightening block, 302b Second straightening block.

Claims

1. A sealed container, A compression mechanism is provided inside the sealed container and has a compression chamber in which the refrigerant is compressed by the interlocking of fixed scroll teeth and oscillating scroll teeth. A rotating shaft is provided inside the sealed container to rotate the oscillating scroll, An electric motor is provided inside the sealed container to rotate the rotating shaft, A frame provided inside the sealed container and rotatably supporting the rotating shaft, A supercharging mechanism provided inside the sealed container, comprising a turbine, an impeller that rotates in conjunction with the rotation of the turbine, and a connecting shaft to which the turbine is connected at one end and the impeller is connected at the other end, Equipped with, The aforementioned fixed scroll includes: A discharge channel through which the refrigerant discharged from the compression chamber of the compression mechanism flows, An intake channel through which the refrigerant drawn into the sealed container flows, A system is in place, The turbine of the supercharging mechanism is positioned in the flow path of the refrigerant from the discharge flow path to the discharge pipe formed in the sealed container. The impeller of the supercharging mechanism is arranged in the intake passage, The connecting shaft of the supercharging mechanism is rotatably supported by the frame. Scroll compressor.

2. The turbine has a group of turbine blades having multiple blades that allow the refrigerant to flow in from the centrifugal direction, The impeller has a group of impeller blades, each having multiple blades that allow the refrigerant to flow in from the axial direction and to flow out in the centrifugal direction. The scroll compressor according to claim 1.

3. The aforementioned sealed container is A cylindrical side wall, An intake pipe that penetrates the side wall and whose tip is positioned within the intake passage, Equipped with, The suction passage of the fixed scroll is Formed so as to extend along the radial direction of the fixed scroll from the side surface facing the side wall of the fixed scroll. A scroll compressor according to claim 1 or 2.

4. The impeller is located inside the suction pipe, Inside the aforementioned suction tube, A first flow straightening block is provided upstream of the impeller in the flow of the refrigerant and in the centrifugal direction of the impeller, A second rectifier block is provided with respect to the impeller, on the opposite side from the turbine, and with the upstream end of the refrigerant facing the connecting shaft, Equipped with The scroll compressor according to claim 3.

5. The refrigerant is a single refrigerant from among R1234yf, R1234ze, R32, or R290, or a mixture of two or more of these, or a mixture of one of these with another refrigerant, or a mixture containing R1132(E), or a mixture containing R1123. A scroll compressor according to claim 1 or 2.

6. A scroll compressor according to claim 1 or 2, A condenser from which the refrigerant compressed by the scroll compressor dissipates heat, A pressure reducer for reducing the pressure of the refrigerant that has leaked out of the condenser, An evaporator from which the refrigerant that has flowed out of the pressure reducer evaporates, A refrigeration cycle device equipped with a refrigeration cycle system.