Compressor and refrigeration cycle device

Abstract

To preferably reduce power for generating a magnet pull force as much as possible in order to save energy.SOLUTION: A compressor includes a motor and a compression mechanism. The compression mechanism is driven via a shaft fixed to the motor. The motor includes a stator, a rotor 124, a first balance weight BW1, and a second balance weight. The rotor 124 is disposed inside in the radial direction of the stator. The first balance weight BW1 is disposed on a first surface 81 on the compression mechanism side of the rotor 124. The second balance weight is disposed on a second surface on the opposite side from the compression mechanism of the rotor 124. The first balance weight BW1 has a shape for generating a force F2 in the direction of a rotary shaft A1 acting on the rotor 124 utilizing the flow of a refrigerant when the rotor 124 rotates.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a compressor and a refrigeration cycle device. [Background technology]

[0002] As disclosed in Patent Document 1 (Japanese Patent Laid-Open Publication No. 11-093874), there is a technique for stabilizing the rotation of a rotor by applying a magnetic pull force to the rotor in the direction of the rotor's rotation axis. Summary of the Invention [Problem to be solved by the invention]

[0003] To save energy, it is desirable to reduce the power required to generate the magnetic pull force as much as possible. [Means for solving the problem]

[0004] A compressor according to a first aspect includes a motor and a compression mechanism. The compression mechanism is driven via a shaft fixed to the motor. The motor has a stator and a rotor. The motor has a first balance weight or a second balance weight. In other words, the motor either has only one of the first balance weight or the second balance weight, or has both the first balance weight and the second balance weight. The stator is cylindrical. The rotor is disposed radially inside the stator. The rotor rotates in the refrigerant. The rotor is cylindrical. The first balance weight is disposed on a first surface of the rotor facing the compression mechanism. The second balance weight is disposed on a second surface of the rotor opposite the compression mechanism. The first balance weight or the second balance weight has a shape that, when the rotor rotates, utilizes the flow of refrigerant to generate a force acting on the rotor in the direction of the rotation axis.

[0005] The compressor according to the first aspect can reduce the electric power required to generate the magnetic pull force by using the generated force in the direction of the rotation axis of the rotor to assist the magnetic pull force.

[0006] A compressor according to a second aspect is the compressor according to the first aspect, wherein the rotor has a first refrigerant flow path that penetrates the interior of the rotor in the direction of the rotation axis, and the first balance weight has a shape that guides refrigerant that collides with the rotor as the rotor rotates into the first refrigerant flow path.

[0007] The compressor of the second aspect can generate a force acting on the rotor in the direction of the rotation axis by a reaction caused by guiding the refrigerant that collides with the first balance weight into the first refrigerant flow path (pushing it in the direction of the rotor's rotation axis).

[0008] A compressor according to a third aspect is the compressor according to the second aspect, wherein the first balance weight is joined to the first surface. The first balance weight has an arcuate shape that follows the circumference of the first surface. A third surface on the front side in the rotational direction of the first balance weight is inclined in the counter-rotation direction of the rotor toward the first refrigerant flow path with respect to a first plane that includes the rotation axis of the rotor and extends in the radial direction of the rotor, when viewed along the radial direction of the rotor.

[0009] With this configuration, the compressor according to the third aspect can guide the refrigerant that collides with the third surface of the first balance weight into the first refrigerant flow path.

[0010] A compressor according to a fourth aspect is the compressor according to the second aspect, wherein the first balance weight is joined to the first surface. The first balance weight has an arcuate shape that follows the circumference of the first surface. The first balance weight has a second refrigerant flow path. The second refrigerant flow path connects the first refrigerant flow path to a third surface on the front side in the rotational direction of the first balance weight.

[0011] In the compressor of the fourth aspect, such a configuration makes it possible to guide the refrigerant that collides with the third surface of the first balance weight to the first refrigerant flow path via the second refrigerant flow path.

[0012] A compressor according to a fifth aspect is the compressor according to the fourth aspect, wherein the second refrigerant flow path passes through the inside of the first balance weight.

[0013] A compressor according to a sixth aspect is the compressor according to the fifth aspect, wherein the opening area of ​​the second refrigerant flow path in the third surface is larger than the cross-sectional area of ​​the first refrigerant flow path.

[0014] With this configuration, the compressor of the sixth aspect can induce a larger amount of refrigerant into the first refrigerant flow path via the second refrigerant flow path, thereby generating a larger force acting on the rotor in the direction of the rotation axis.

[0015] A compressor according to a seventh aspect is the compressor according to the fourth aspect, wherein the second refrigerant flow path has a tunnel shape, and the tunnel shape is open on the first surface side.

[0016] With this configuration, the compressor according to the seventh aspect can avoid a decrease in strength of the first balance weight due to a thinner first balance weight. Also, by increasing the opening area of ​​the second refrigerant flow path, the compressor can guide more refrigerant to the first refrigerant flow path via the second refrigerant flow path, and generate a greater force acting on the rotor in the direction of the rotation axis.

[0017] The compressor of an eighth aspect is the compressor of the first aspect, wherein the first balance weight is provided on the first surface via a support. The first balance weight has an arcuate shape along the circumference of the first surface. The shape of the first balance weight in a cross section in the rotation direction of the rotor is an airfoil shape that generates lift acting on the rotor in the direction of the rotation axis.

[0018] The compressor according to the eighth aspect can reduce the electric power required to generate the magnetic pull force by using the generated lift force in the direction of the rotation axis of the rotor to assist the magnetic pull force.

[0019] A ninth aspect of the compressor is the compressor of any one of the first to eighth aspects, wherein the second balance weight is provided on the second surface via a support. The second balance weight has an arcuate shape that follows the circumference of the second surface. The shape of the second balance weight in a cross section in the rotation direction of the rotor is an airfoil shape that generates lift acting on the rotor in the direction of the rotation axis.

[0020] The compressor according to the ninth aspect can reduce the electric power required to generate the magnetic pull force by using the generated lift force in the direction of the rotation axis of the rotor to assist the magnetic pull force.

[0021] A refrigeration cycle device according to a tenth aspect includes a refrigerant circuit having the compressor according to any one of the first to ninth aspects. [Brief explanation of the drawings]

[0022] [Figure 1] FIG. 1 is a schematic diagram of a refrigeration cycle device. [Figure 2] FIG. 2 is a control block diagram of the refrigeration cycle device. [Figure 3] FIG. 2 is a cross-sectional side view showing a schematic structure of a compressor. [Figure 4] FIG. 2 is a schematic perspective view of a rotor according to the present embodiment. [Figure 5] FIG. 2 is an enlarged cross-sectional view of the rotor in the rotation direction according to the present embodiment. [Figure 6] FIG. 10 is a schematic perspective view of a rotor in Modification 1A. [Figure 7] FIG. 10 is an enlarged cross-sectional view of the rotor in the rotation direction in Modification 1A. [Figure 8] FIG. 10 is a schematic perspective view of a rotor in Modification 1A. [Figure 9] FIG. 10 is an enlarged cross-sectional view of the rotor in the rotation direction in Modification 1A. [Figure 10] FIG. 10 is a schematic perspective view of a rotor in Modification 1A. [Figure 11] FIG. 10 is an enlarged cross-sectional view of the rotor in the rotation direction in Modification 1A. [Figure 12] FIG. 10 is a schematic perspective view of a rotor in Modification 1B. [Figure 13] FIG. 10 is an enlarged cross-sectional view of the rotor in the rotation direction in Modification 1B. [Figure 14] FIG. 10 is a schematic perspective view of a rotor in Modification 1B. [Figure 15] FIG. 10 is an enlarged cross-sectional view of the rotor in the rotation direction in Modification 1B. [Figure 16] FIG. 10 is a schematic perspective view of a rotor in Modification 1A. [Figure 17] FIG. 10 is an enlarged cross-sectional view of the rotor in the rotation direction in Modification 1A. DETAILED DESCRIPTION OF THE INVENTION

[0023] (1) Overall structure Fig. 1 is a schematic configuration diagram of the refrigeration cycle apparatus 1. Fig. 2 is a control block diagram of the refrigeration cycle apparatus 1. In the refrigeration cycle apparatus 1, a vapor compression refrigeration cycle is performed in a refrigerant circuit 10, in which a refrigerant is compressed, releases heat or condenses, is depressurized, is heated and evaporates, and is then compressed again. The refrigerant may be a single refrigerant such as R32, or a mixed refrigerant such as R454C.

[0024] As shown in FIG. 1, the refrigeration cycle device 1 mainly includes a heat source unit 20 and a utilization unit 30.

[0025] (2) Detailed configuration (2-1) Heat source unit The heat source unit 20 is installed, for example, outdoors or in a machine room. As shown in Fig. 1, the heat source unit 20 mainly has a compressor 100, a flow path switching mechanism 22, a heat source heat exchanger 23, an expansion mechanism 24, a heat source fan 25, and an accumulator 41. The heat source unit 20 also has a first control unit 27 that controls the operation of each part that constitutes the heat source unit 20.

[0026] The compressor 100 is a device that compresses low-pressure refrigerant in a refrigeration cycle drawn in through a suction port, raises the pressure to the high pressure in the refrigeration cycle, and discharges the refrigerant from a discharge port. The compressor 100 is a hermetic compressor in which a positive displacement compression mechanism 130, such as a rotary or scroll type, is driven by a motor 120. The operating frequency of the motor 120 of the compressor 100 can be controlled by an inverter. Details of the compressor 100 will be described later.

[0027] The flow path switching mechanism 22 is a mechanism that switches the flow paths of the refrigerant circuit 10. In this embodiment, the flow path switching mechanism 22 is a four-way switching valve. When the refrigeration cycle apparatus 1 performs cooling operation, the flow path switching mechanism 22 switches the state of the refrigerant circuit 10 to a first state (indicated by the solid line in the flow path switching mechanism 22 in FIG. 1). When the refrigeration cycle apparatus 1 performs heating operation, the flow path switching mechanism 22 switches the state of the refrigerant circuit 10 to a second state (indicated by the dashed line in the flow path switching mechanism 22 in FIG. 1).

[0028] The heat source heat exchanger 23 functions as a radiator or condenser of high-pressure refrigerant in the refrigeration cycle during cooling operation of the refrigeration cycle device 1, and functions as an evaporator of low-pressure refrigerant in the refrigeration cycle during heating operation.

[0029] The expansion mechanism 24 is a mechanism for adjusting the pressure and flow rate of the refrigerant flowing through the refrigerant circuit 10. In this embodiment, the expansion mechanism 24 is an electronic expansion valve whose valve opening degree is adjustable.

[0030] The heat source fan 25 generates an air flow such that air acting as a heat source outside the casing (not shown) of the heat source unit 20 is drawn into the casing and supplied to the heat source heat exchanger 23, and the air that has exchanged heat with the refrigerant in the heat source heat exchanger 23 is discharged to the outside of the casing.

[0031] The accumulator 41 is a refrigerant container that has a gas-liquid separation function and is capable of storing excess refrigerant in the refrigerant circuit 10 as liquid refrigerant.

[0032] The first control unit 27 has a microcomputer including a CPU, memory, etc. The first control unit 27 is connected to a second control unit 34 of the utilization unit 30 (described later) via a communication line, and transmits and receives control signals and the like to and from the second control unit 34.

[0033] (2-2) Usage unit The utilization unit 30 is installed, for example, on the walls, ceiling, floor, etc. of a room that is the target space, or in the attic of the target space. As shown in Fig. 1, the utilization unit 30 mainly has a utilization heat exchanger 31 and a utilization fan 32. The utilization unit 30 also has a second control unit 34 that controls the operation of each part that constitutes the utilization unit 30.

[0034] The utilization heat exchanger 31 functions as an evaporator of low-pressure refrigerant in the refrigeration cycle during cooling operation of the refrigeration cycle device 1, and functions as a radiator or condenser of high-pressure refrigerant in the refrigeration cycle during heating operation.

[0035] The utilization fan 32 generates an air flow such that air from the space to be air-conditioned is drawn into the inside of a casing (not shown) of the utilization unit 30 and supplied to the utilization heat exchanger 31, and the air that has exchanged heat with the refrigerant in the utilization heat exchanger 31 is blown out to the outside of the casing.

[0036] The second control unit 34 has a microcomputer including a CPU, memory, etc. The second control unit 34 is connected to the first control unit 27 of the heat source unit 20 via a communication line, and transmits and receives control signals and the like to and from the first control unit 27.

[0037] (3) Compressor Fig. 3 is a side cross-sectional view showing a schematic structure of the compressor 100. As shown in Fig. 3, the compressor 100 of this embodiment is a single-cylinder rotary compressor. However, the type of the compressor 100 is not limited to this, and may be, for example, a two-cylinder rotary compressor, a scroll compressor, or a screw compressor.

[0038] The compressor 100 mainly includes a casing 110 , a motor 120 , a compression mechanism 130 , a shaft 140 , and a terminal 200 .

[0039] (3-1) Casing Casing 110 is a vertical cylindrical container. As shown in Fig. 3, casing 110 has a cylindrical member 112 that is open at the top and bottom, and a bowl-shaped upper lid 114a and a lower lid 114b that are provided at the upper and lower ends, respectively, of cylindrical member 112. Cylindrical member 112, upper lid 114a, and lower lid 114b are fixed by welding to maintain airtightness.

[0040] Cylindrical member 112 is provided with a suction pipe connection portion 116, into which a suction pipe 42a is inserted. Suction pipe 42a inserted into suction pipe connection portion 116 is connected to compression mechanism 130. Upper lid 114a is provided with a discharge pipe connection portion 118, to which a discharge pipe 42b is connected. High-pressure refrigerant compressed by compression mechanism 130 is discharged through discharge pipe connection portion 118 to discharge pipe 42b.

[0041] The casing 110 accommodates therein a motor 120, a compression mechanism 130, and a shaft 140. A terminal 200 is attached to an upper cover 114a of the casing 110.

[0042] (3-2) Motor 3, the motor 120 drives the compression mechanism 130 via a shaft 140. The motor 120 is disposed above the compression mechanism 130.

[0043] The motor 120 mainly includes a stator 122, a rotor 124, a first balance weight BW1, and a second balance weight BW2.

[0044] (3-2-1) Stator The stator 122 is a cylindrical member and mainly includes an annular stator core 122a, windings 122b wound around the stator core 122a, and insulators 122c disposed above the upper end surface and below the lower end surface of the stator core 122a.

[0045] The stator core 122a is fixed to the cylindrical member 112 of the casing 110. For example, the stator core 122a is fixed inside the cylindrical member 112 by an interference fit such as shrink fitting or press fitting. The insulators 122c are arranged adjacent to the annular stator core 122a on the upper and lower inner circumferential sides of the stator core 122a. A winding 122b is wound around the stator core 122a via the insulators 122c. The winding 122b is connected to a terminal 200 attached to the casing 110 via a lead wire (not shown). Power is supplied to the winding 122b from an external power source via the terminal 200 and the lead wire.

[0046] A current is passed through the winding 122b wound around the stator core 122a via the lead wires, generating a magnetic field in the stator 122 to rotate the rotor 124. Furthermore, a current is passed through the winding 122b wound around the stator core 122a via the lead wires, generating a magnetic pull force F1 that presses the rotor 124 against the lower bearing portion 138b of the rear head 138 via the shaft 140. The magnetic pull force F1 acts in the direction of the rotation axis A1 of the rotor 124 (downward in this embodiment), eliminating any misalignment between the rotation axis A1 of the rotor 124 and the central axis of the stator 122.

[0047] (3-2-2) Rotor 3, the rotor 124 is disposed radially inside the stator 122. The rotor 124 is a cylindrical member. The rotor 124 is formed by laminating a plurality of annular electromagnetic steel plates.

[0048] Fig. 4 is a schematic perspective view of rotor 124 in this embodiment. Fig. 5 is an enlarged cross-sectional view of rotor 124 in the rotational direction in this embodiment. As shown in Figs. 3 to 5, rotor 124 has a first refrigerant flow path 91. First refrigerant flow path 91 passes through the interior of rotor 124 in the direction of rotation axis A1. In this embodiment, one of a plurality of cylindrical holes for fastening rivets is used as first refrigerant flow path 91.

[0049] A shaft 140 is inserted into and fixed in the hollow portion of the rotor 124. The shaft 140 has an eccentric portion 142. The shaft 140 is connected to a roller 136a of a piston 136 of the compression mechanism 130 at the eccentric portion 142.

[0050] When a current is supplied to motor 120 and a current flows through winding 122b, a rotating magnetic field is generated in stator 122, causing rotor 124 to rotate in the refrigerant. When rotor 124 rotates in the refrigerant, shaft 140 connected to rotor 124 also rotates, and a driving force is applied to compression mechanism 130 via shaft 140.

[0051] (3-2-3) Balance weight The first balance weight BW1 and the second balance weight BW2 are made of a non-magnetic material and prevent imbalance in rotation caused by eccentric rotation of the eccentric portion 142 and the roller 136a of the piston 136.

[0052] (3-2-3-1) First balance weight 3 to 5, the first balance weight BW1 is disposed on a first surface 81 of the rotor 124 on the compression mechanism 130 side. The first balance weight BW1 is disposed on the opposite side of the central axis of the eccentric portion 142 when viewed from the direction of the rotation axis A1 of the shaft 140.

[0053] The first balance weight BW1 has a shape that uses the flow of refrigerant to generate a force F2 acting on the rotor 124 in the direction of the rotation axis A1 when the rotor 124 rotates. Specifically, the first balance weight BW1 has a shape that guides the refrigerant that collides with the rotor 124 into the first refrigerant flow path 91 when the rotor 124 rotates (in FIGS. 4 and 5, the refrigerant being guided into the first refrigerant flow path 91 is indicated by a thick arrow. Hereinafter, the thick arrows in the drawings indicate the flow of refrigerant). In this embodiment, the first balance weight BW1 is joined to the first surface 81. The first balance weight BW1 has an arcuate shape that follows the circumference of the first surface 81. The third surface 83 on the front side in the rotational direction of the first balance weight BW1 is inclined in the reverse rotational direction of the rotor 124 toward the first refrigerant flow path 91 with respect to the first plane P1 which includes the rotation axis A1 of the rotor 124 and extends in the radial direction of the rotor 124 when viewed along the radial direction of the rotor 124.

[0054] Therefore, the refrigerant that collides with the third surface 83 of the first balance weight BW1 is guided into the first refrigerant flow path 91, and the reaction generates a force F2 acting on the rotor 124 in the direction of the rotation axis A1 (downward in this embodiment), so that the compressor 100 can assist the magnetic pull force F1 and reduce the power required to generate the magnetic pull force F1.

[0055] (3-2-3-2) Second balance weight 3 to 5, the second balance weight BW2 is disposed on the second surface 82 of the rotor 124, on the opposite side to the compression mechanism 130. The second balance weight BW2 is disposed on the same side as the central axis of the eccentric portion 142 when viewed from the direction of the rotation axis A1 of the shaft 140.

[0056] (3-3) Compression mechanism As shown in Fig. 3, compression mechanism 130 is a mechanism that compresses the refrigerant drawn through suction pipe 42a. Compression mechanism 130 is driven by motor 120 via a shaft 140 fixed to motor 120. Compression mechanism 130 is housed below motor 120 on the lower side of casing 110. Rotary type compression mechanism 130 mainly has a front head 132, a cylinder 134, a piston 136, and a rear head 138.

[0057] The cylinder 134 has a cylindrical portion 134a with open upper and lower end faces, and an extending portion 134b extending outward (toward the casing 110) from the cylindrical portion 134a in a plan view. A piston 136 for compressing the refrigerant is housed in a columnar space surrounded by the inner circumferential surface of the cylindrical portion 134a. A suction hole 134ba is formed in the extending portion 134b, through which low-pressure refrigerant in the refrigeration cycle is drawn. The tip of the suction pipe 42a is inserted into the suction hole 134ba through an opening of the suction hole 134ba formed in the outer circumferential surface of the extending portion 134b. A front head 132 is disposed above the cylinder 134 so as to close the upper opening of the cylindrical portion 134a. A rear head 138 is disposed below the cylinder 134 so as to close the lower opening of the cylindrical portion 134a. A cylinder chamber is formed by the inner peripheral surface of cylindrical portion 134a of cylinder 134, the lower surface of front head 132, and the upper surface of rear head 138. A piston 136 is disposed in the cylinder chamber. A compression chamber S1 in which the refrigerant is compressed is formed by the inner peripheral surface of cylindrical portion 134a of cylinder 134, the lower surface of front head 132, the upper surface of rear head 138, and the outer peripheral surface of piston 136 disposed in the cylinder chamber.

[0058] The front head 132 has a front head disk portion 132a that closes the upper opening of the cylindrical portion 134a of the cylinder 134, and an upper bearing portion 132b that extends upward from the center of the front head disk portion 132a. The upper bearing portion 132b is cylindrical and functions as a bearing for the shaft 140.

[0059] The rear head 138 has a rear head disc portion 138a that closes the lower opening of the cylindrical portion 134a of the cylinder 134, and a lower bearing portion 138b that extends downward from the center of the rear head disc portion 138a. The lower bearing portion 138b is cylindrical and functions as a bearing for the shaft 140.

[0060] The piston 136 is a member formed by integrating a cylindrical roller 136a and a plate-shaped blade extending radially from the outer surface of the roller 136a. An eccentric portion 142 of a shaft 140 is fitted into the hollow portion of the roller 136a. The blade of the piston 136 is disposed in a blade pivoting space formed in the cylinder 134 and is pivotally supported by the cylinder 134 via a bushing disposed in the blade pivoting space. During operation of the compressor 100, the blade pivots relative to the cylinder 134 and repeatedly moves in and out of the blade pivoting space.

[0061] The roller 136a and blade of the piston 136 divide the cylinder chamber and form a compression chamber S1 whose volume changes with the revolution of the piston 136. When the shaft 140 rotates, the roller 136a revolves relative to the cylinder 134. Accordingly, the volume of the compression chamber S1 changes, and the low-pressure refrigerant sucked from the suction pipe 42a is compressed to become high-pressure refrigerant, which is then discharged from the discharge hole into the muffler space S2.

[0062] (3-4) Terminal The terminal 200 is attached to the top cover 114a of the casing 110. The terminal 200 mainly includes a main body 210 and three terminal pins 220.

[0063] The main body 210 is a member that supports the terminal pin 220. The main body 210 is a generally hat-shaped member. The terminal 200 is attached to the casing 110 so that the side of the main body 210 where the disk is present is located on the outside of the casing 110 and the open side of the main body 210 is located on the inside of the casing 110.

[0064] The terminal pins 220 are cylindrical members that extend through holes formed in the disk of the main body 210. The three terminal pins 220 extend generally parallel to one another.

[0065] A terminal plate is fixed to the end of each terminal pin 220 on the inner side of the casing 110. A terminal attached to the tip of the end of a lead wire for connecting the winding 122b of the stator 122 of the motor 120 to the terminal 200 is connected to each terminal plate.

[0066] (4) Compressor operation In the compressor 100, when the motor 120 is operated and the shaft 140 rotates, the rotation of the shaft 140 causes the roller 136a of the piston 136 of the compression mechanism 130 to revolve. As the roller 136a revolves, the volume of the compression chamber S1, which is connected to the suction pipe 42a, gradually increases, and low-pressure refrigerant is drawn from the suction pipe 42a into the compression chamber S1. As the roller 136a of the piston 136 further revolves, the communication between the compression chamber S1 and the suction pipe 42a is terminated, and the refrigerant begins to be compressed in the compression chamber S1, which is now connected to the discharge hole. Thereafter, the volume of the compression chamber S1, which is now connected to the discharge hole, gradually decreases, and the refrigerant pressure increases. The refrigerant, which becomes high-pressure as the volume of the compression chamber S1 decreases, pushes open a discharge valve provided in the discharge hole and is discharged from the discharge hole into the muffler space S2. The refrigerant that flows into the muffler space S2 flows from the muffler discharge hole into the space above the compression mechanism 130. The refrigerant that flows into the space above the compression mechanism 130 passes through the gap between the stator 122 and rotor 124 of the motor 120, cools the motor 120, and is then discharged into the discharge pipe 42b via the discharge pipe connection part 118.

[0067] (4) Features (4-1) Conventionally, there is a technology that stabilizes the rotation of a rotor by applying a magnetic pull force to the rotor in the direction of the rotor's rotation axis. To save energy, it is desirable to reduce the power required to generate the magnetic pull force as much as possible.

[0068] The compressor 100 of this embodiment includes a motor 120 and a compression mechanism 130. The compression mechanism 130 is driven via a shaft 140 fixed to the motor 120. The motor 120 includes a stator 122, a rotor 124, a first balance weight BW1, and a second balance weight BW2. The stator 122 is cylindrical. The rotor 124 is disposed radially inside the stator 122. The rotor 124 rotates in the refrigerant. The rotor 124 is cylindrical. The first balance weight BW1 is disposed on a first surface 81 of the rotor 124 that faces the compression mechanism 130. The second balance weight BW2 is disposed on a second surface 82 of the rotor 124 that is opposite the compression mechanism 130. The first balance weight BW1 has a shape that generates a force F2 acting on the rotor 124 in the direction of the rotation axis A1 by utilizing the flow of the refrigerant when the rotor 124 rotates.

[0069] The compressor 100 of this embodiment can reduce the power required to generate the magnetic pull force F1 by using the generated force F2 in the direction of the rotation axis A1 of the rotor 124 to assist the magnetic pull force F1.

[0070] (4-2) In the compressor 100 of this embodiment, the rotor 124 has a first refrigerant flow path 91. The first refrigerant flow path 91 penetrates the inside of the rotor 124 in the direction of the rotation axis A1. The first balance weight BW1 has a shape that guides the refrigerant that collides with the rotor 124 into the first refrigerant flow path 91 when the rotor 124 rotates.

[0071] The compressor 100 of this embodiment can generate a force F2 acting on the rotor 124 in the direction of the rotation axis A1 by a reaction caused by guiding the refrigerant that collides with the first balance weight BW1 into the first refrigerant flow path 91 (pushing it in the direction of the rotation axis A1 of the rotor 124).

[0072] (4-3) In the compressor 100 of this embodiment, the first balance weight BW1 is joined to the first surface 81. The first balance weight BW1 has an arcuate shape that follows the circumference of the first surface 81. A third surface 83 on the front side in the rotational direction of the first balance weight BW1 is inclined toward the first refrigerant flow path 91 in the counter-rotation direction of the rotor 124 with respect to a first plane P1 that includes the rotation axis A1 of the rotor 124 and extends in the radial direction of the rotor 124, when viewed along the radial direction of the rotor 124.

[0073] The compressor 100 of this embodiment has such a configuration that the refrigerant that collides with the third surface 83 of the first balance weight BW1 can be guided to the first refrigerant flow path 91.

[0074] (4-4) The refrigeration cycle device 1 of this embodiment includes a refrigerant circuit 10. The refrigerant circuit 10 has a compressor 100.

[0075] (5) Variations (5-1) Variation 1A 6, 8, 10, and 16 are schematic perspective views of the rotor 124 in this modified example. Figures 7, 9, 11, and 17 are enlarged cross-sectional views in the rotational direction of the rotor 124 in this modified example. In order to guide the refrigerant that collides with the rotor 124 as it rotates into the first refrigerant flow path 91, the first balance weight BW1 may have the shape shown in Figures 6 and 7.

[0076] Specifically, the first balance weight BW1 is joined to the first surface 81. The first balance weight BW1 has an arcuate shape that follows the circumference of the first surface 81. The first balance weight BW1 has a second refrigerant flow path 92. The second refrigerant flow path 92 connects the first refrigerant flow path 91 to a third surface 83 on the front side in the rotational direction of the first balance weight BW1. The second refrigerant flow path 92 penetrates the interior of the first balance weight BW1. As a result, the compressor 100 can guide the refrigerant that collides with the third surface 83 of the first balance weight BW1 to the first refrigerant flow path 91 via the second refrigerant flow path 92.

[0077] 8 and 9, the opening area S3 of the second refrigerant flow path 92 in the third surface 83 is preferably larger than the cross-sectional area S4 of the first refrigerant flow path 91. As a result, the compressor 100 can induce a larger amount of refrigerant into the first refrigerant flow path 91 via the second refrigerant flow path 92, thereby generating a larger force F2 acting on the rotor 124 in the direction of the rotation axis A1.

[0078] 10 and 11, the second refrigerant flow path 92 may have a tunnel-like shape. The tunnel-like shape is open on the first surface 81 side. As a result, the compressor 100 can avoid a decrease in the strength of the first balance weight BW1 due to a decrease in the thickness of the first balance weight BW1. Furthermore, by increasing the opening area of ​​the second refrigerant flow path 92, the compressor 100 can guide more refrigerant to the first refrigerant flow path 91 via the second refrigerant flow path 92, and generate a larger force F2 acting on the rotor 124 in the direction of the rotation axis A1.

[0079] The first balance weight BW1 may have a shape shown in FIGS. 16 and 17 in order to generate a force F2 acting on the rotor 124 in the direction of the rotation axis A1 by utilizing the flow of the refrigerant when the rotor 124 rotates.

[0080] Specifically, the first balance weight BW1 is mounted on the first surface 81 via a support 99. The first balance weight BW1 has an arcuate shape that follows the circumference of the first surface 81. The shape of the first balance weight BW1 in a cross section in the rotational direction of the rotor 124 is an airfoil shape that generates a lift force F2 acting on the rotor 124 in the direction of the rotation axis A1. As a result, the compressor 100 can reduce the power required to generate the magnetic pull force F1 by using the generated lift force F2 in the direction of the rotation axis A1 of the rotor 124 to supplement the magnetic pull force F1.

[0081] (5-2) Variation 1B Figures 12 and 14 are schematic perspective views of rotor 124 in this modified example. Figures 13 and 15 are enlarged cross-sectional views of rotor 124 in the rotational direction in this modified example. In order to generate force F3 acting on rotor 124 in the direction of rotation axis A1 by utilizing the flow of refrigerant when rotor 124 rotates, second balance weight BW2 may have the shape shown in Figures 12 and 13.

[0082] Specifically, the second balance weight BW2 is provided on the second surface 82 via a support 98. The second balance weight BW2 has an arcuate shape that follows the circumference of the second surface 82. The shape of the second balance weight BW2 in a cross section in the rotational direction of the rotor 124 is an airfoil shape that generates a lift force F3 in the direction of the rotation axis A1 that acts on the rotor 124. As a result, the compressor 100 can reduce the power required to generate the magnetic pull force F1 by using the generated lift force F3 in the direction of the rotation axis A1 of the rotor 124 to supplement the magnetic pull force F1.

[0083] In addition, the second balance weight BW2 may have a shape shown in Figures 14 and 15 in order to generate a force F3 acting on the rotor 124 in the direction of the rotation axis A1 by utilizing the flow of the refrigerant when the rotor 124 rotates.

[0084] Specifically, the second balance weight BW2 is joined to the second surface 82. The second balance weight BW2 has an arcuate shape that follows the circumference of the second surface 82. A fourth surface 84 on the front side in the rotational direction of the second balance weight BW2 is inclined in the counter-rotational direction of the rotor 124 with respect to a first plane P1 that includes the rotation axis A1 of the rotor 124 and extends in the radial direction of the rotor 124, when viewed along the radial direction of the rotor 124. As a result, the compressor 100 can generate a force F3 acting on the rotor 124 in the direction of the rotation axis A1 due to a reaction caused by pushing the refrigerant that collides with the fourth surface 84 of the second balance weight BW2 in the direction of the rotation axis A1 of the rotor 124.

[0085] (5-3) Variation 1C Of the first balance weight BW1 and the second balance weight BW2, only the first balance weight BW1 may have a shape that generates a force F2 acting on the rotor 124 in the direction of the rotation axis A1 (a shape shown in any of FIGS. 4 to 11, 16 to 17), or only the second balance weight BW2 may have a shape that generates a force F3 acting on the rotor 124 in the direction of the rotation axis A1 (a shape shown in any of FIGS. 12 to 15), or both the first balance weight BW1 and the second balance weight BW2 may have shapes that generate forces F2 and F3 acting on the rotor 124 in the direction of the rotation axis A1. In particular, when the first balance weight BW1 and the second balance weight BW2 both have shapes that generate forces F2 and F3 acting on the rotor 124 in the direction of the rotation axis A1, the forces F2 and F3 acting on the rotor 124 in the direction of the rotation axis A1 are generated simultaneously, so that the compressor 100 can further supplement the magnetic pull force F1 and further reduce the power required to generate the magnetic pull force F1.

[0086] (5-4) Variation 1D In this embodiment, the motor 120 has the first balance weight BW1 and the second balance weight BW2. However, the motor 120 may have only one of the first balance weight BW1 and the second balance weight BW2.

[0087] When the motor 120 has only the first balance weight BW1, the first balance weight BW1 has a shape (a shape shown in any one of Figures 4 to 11, 16 to 17) that generates a force F2 acting on the rotor 124 in the direction of the rotation axis A1.

[0088] When the motor 120 has only the second balance weight BW2, the second balance weight BW2 has a shape (a shape shown in any one of Figures 12 to 15) that generates a force F3 acting on the rotor 124 in the direction of the rotation axis A1.

[0089] (5-5) Although the embodiments of the present disclosure have been described above, it will be understood that various changes in form and details can be made without departing from the spirit and scope of the present disclosure as defined in the claims. [Explanation of symbols]

[0090] 1 Refrigeration cycle device 10 Refrigerant circuit 81 Page 1 82 2nd page 83 Page 3 91 first refrigerant flow path 92 Second refrigerant flow path 98,99 Post 100 Compressor 120 motor 122 Stator 124 rotor 130 Compression Mechanism 140 shaft A1 rotation axis BW1 First balance weight BW2 Second balance weight F2 force, lift F3 force, lift P1 1st plane S3 Opening area of ​​the second refrigerant flow path S4 Cross-sectional area of ​​the first refrigerant flow path [Prior art documents] [Patent documents]

[0091] [Patent Document 1] Japanese Patent Application Publication No. 11-093874

Claims

1. a motor (120); a compression mechanism (130) driven via a shaft (140) fixed to the motor; Equipped with The motor a cylindrical stator (122); a cylindrical rotor (124) disposed radially inside the stator and rotating in a refrigerant; a first balance weight (BW1) disposed on a first surface (81) of the rotor on the compression mechanism side, or a second balance weight (BW2) disposed on a second surface (82) of the rotor on the opposite side to the compression mechanism; and The first balance weight or the second balance weight has a shape that generates a force (F2, F3) acting on the rotor in the direction of the rotation axis (A1) by utilizing the flow of refrigerant when the rotor rotates. A compressor (100).

2. The rotor has a first refrigerant flow path (91) that penetrates the inside of the rotor in the direction of the rotation axis, The first balance weight has a shape that guides the refrigerant that collides with the rotor when the rotor rotates into the first refrigerant flow path. The compressor (100) of claim 1.

3. the first balance weight is joined to the first surface, the first balance weight has an arcuate shape along the circumference of the first surface, a third surface (83) on the front side in the rotational direction of the first balance weight is inclined, when viewed along the radial direction of the rotor, toward the first refrigerant flow path in a counter-rotation direction of the rotor with respect to a first plane (P1) that includes the rotation axis of the rotor and extends in the radial direction of the rotor; The compressor (100) of claim 2.

4. the first balance weight is joined to the first surface, the first balance weight has an arcuate shape along the circumference of the first surface, The first balance weight has a second refrigerant flow path (92) connecting a third surface (83) on the front side in the rotation direction of the first balance weight and the first refrigerant flow path. The compressor (100) of claim 2.

5. The second refrigerant flow path passes through the inside of the first balance weight. The compressor (100) of claim 4.

6. An opening area (S3) of the second refrigerant flow path in the third surface is larger than a cross-sectional area (S4) of the first refrigerant flow path. The compressor (100) of claim 5.

7. The second refrigerant flow path has a tunnel shape that is open on the first surface side. The compressor (100) of claim 4.

8. The first balance weight is provided on the first surface via a support (99), the first balance weight has an arcuate shape along the circumference of the first surface, The shape of the first balance weight in a cross section in the rotation direction of the rotor is an airfoil shape that generates lift (F2) acting on the rotor in the direction of the rotation axis. The compressor (100) of claim 1.

9. The second balance weight is provided on the second surface via a support (98), the second balance weight has an arcuate shape along the circumference of the second surface, The shape of the second balance weight in a cross section in the rotation direction of the rotor is an airfoil shape that generates lift (F3) acting on the rotor in the direction of the rotation axis. A compressor (100) according to any one of claims 1 to 8.

10. A refrigerant circuit (10) comprising a compressor (100) according to any one of claims 1 to 8. Equipped with Refrigeration cycle device (1).

Images