compressors and air conditioners

Abstract

Embodiments of the present invention provide a compressor and an air conditioner capable of reducing noise caused by bending vibration of a rotating shaft. The compressor of the embodiment includes a sealed container, a compression mechanism, a motor, a bearing, and a winding tube. The sealed container is cylindrical. The compression mechanism has a rotating shaft that rotates about its axis inside the sealed container to compress the refrigerant. The motor has a rotor fixed to the rotating shaft and a stator fixed to the inner circumference of the sealed container, surrounding the rotor and wound with coils; the motor drives the rotating shaft. The bearing is disposed on the side opposite to the compression mechanism, across the motor in the axial direction of the rotating shaft, supporting the rotating shaft so that it can rotate. The winding tube has a first portion including a coil wiring portion for wiring the coil and a second portion including a bearing holding portion for holding the bearing, disposed at one end in the axial direction of the stator.

Description

[0001] This application is based on Japanese Patent Application 2022-023035 (filed on February 17, 2022) and enjoys priority to that application. The entire contents of that application are incorporated herein by reference. Technical Field

[0002] Embodiments of the present invention relate to a compressor and an air conditioner equipped with the compressor. Background Technology

[0003] A compressor, which compresses refrigerant, is installed in a refrigeration cycle unit such as an air conditioner. The compressor, as its main component, includes, for example, an electric motor that rotates a rotating shaft, a compression mechanism connected to the electric motor via the rotating shaft, and a sealed container housing the electric motor and the compression mechanism. The electric motor, for example, includes a so-called internal rotor type motor, having a rotor fixed to the rotating shaft and a stator fixed to the inner circumference of the sealed container. The rotating shaft has a crank pin portion (eccentric portion). The compression mechanism includes, for example, a cylinder forming a cylinder chamber, and rollers that engage with the eccentric portion of the rotating shaft and rotate eccentrically within the cylinder chamber. The cylinder chamber is divided into a refrigerant suction chamber and a compression chamber by blades. The rotating shaft is supported by bearings disposed within the compression mechanism and is freely rotatable.

[0004] In a sealed container, the motor is positioned above and the compression mechanism is positioned below, connected via a rotating shaft. A bearing supporting the rotating shaft is assembled in the compression mechanism, supporting the lower part of the rotating shaft. Conversely, the upper part of the rotating shaft is not supported by a bearing. Therefore, the rotating shaft is in a cantilevered state, which, during operation, causes the rotating shaft to oscillate and potentially increase noise generated by vibration. Summary of the Invention

[0005] The problem to be solved by the present invention is to provide a compressor that can reduce noise caused by the bending vibration of the rotating shaft.

[0006] One embodiment of the compressor includes a sealed container, a compression mechanism, a motor, a bearing, and a winding tube. The sealed container is cylindrical. The compression mechanism has a rotating shaft that rotates about an axis inside the sealed container to compress refrigerant. The motor has a rotor fixed to the rotating shaft and a stator fixed to the inner circumference of the sealed container, surrounding the rotor and wound with coils; the motor drives the rotating shaft. The bearing is disposed on the side opposite to the compression mechanism, across the motor, in the axial direction of the rotating shaft, supporting the rotating shaft so that it can rotate. The winding tube has a first portion including a coil wiring portion for wiring the coil and a second portion including a bearing holding portion for holding the bearing, disposed at one end of the stator in the axial direction.

[0007] The compressor and the air conditioner equipped with the compressor described above can suppress the oscillation of the rotating shaft and suppress the increase of noise caused by vibration. Attached Figure Description

[0008] Figure 1 This is a circuit diagram that outlines the configuration of the air conditioner according to the first embodiment.

[0009] Figure 2 This is a longitudinal sectional view of the compressor according to the first embodiment.

[0010] Figure 3 This is a perspective view showing the state in which the winding tube of the first embodiment is assembled on the stator.

[0011] Figure 4 This is a perspective view that schematically represents the winding tube of the first embodiment.

[0012] Figure 5 It is a perspective view that schematically shows the shape of the winding tube formed by processing a metal plate to form the first part, the second part, and the third part in the first embodiment.

[0013] Figure 6 The diagram below schematically illustrates the state of the first claw retaining bearing (third bearing) in the second part of the first embodiment.

[0014] Figure 7 This is a perspective view that schematically represents the winding tube of the second embodiment.

[0015] Figure 8 This is a perspective view that schematically represents the winding tube of the third embodiment.

[0016] Figure 9 This is a perspective view that schematically represents the winding tube of the fourth embodiment. Detailed Implementation

[0017] The following is for reference Figures 1 to 9 The implementation method is described below.

[0018] (First Embodiment)

[0019] Figure 1 This is a refrigeration cycle circuit diagram of the air conditioner 1 according to this embodiment. The air conditioner 1 is a device that regulates air through this refrigeration cycle, and is an example of a refrigeration cycle device. The air conditioner 1 includes, as its main components, a compressor 2, a four-way valve 3, an outdoor heat exchanger 4, an outdoor blower 40, an expansion device 5, an indoor heat exchanger 6, and an indoor blower 60.

[0020] like Figure 1As shown, the discharge side of compressor 2 is connected to port 3a of four-way valve 3. Port 3b of four-way valve 3 is connected to outdoor heat exchanger 4. Outdoor heat exchanger 4 is connected to indoor heat exchanger 6 via expansion device 5. Indoor heat exchanger 6 is connected to port 3c of four-way valve 3. Port 3d of four-way valve 3 is connected to the suction side of compressor 2 via energy storage device 8.

[0021] The refrigerant circulates in a loop 7 from the discharge side of compressor 2 through outdoor heat exchanger 4, expansion device 5, indoor heat exchanger 6, and accumulator 8 to the suction side. Preferably, the refrigerant is a chlorine-free refrigerant, such as R448A, R449A, R449B, R407G, R407H, R449C, R456A, R516A, R406B, R463A, R744, and HC series refrigerants.

[0022] For example, when the air conditioner 1 is operating in cooling mode, the four-way valve 3 is switched so that port 1 3a is connected to port 2 3b, and port 3c is connected to port 4 3d. When the air conditioner 1 starts operating in cooling mode, the high-temperature, high-pressure gaseous refrigerant compressed by the compressor 2 is discharged into the circulation loop 7. The discharged gaseous refrigerant is guided through the four-way valve 3 to the outdoor heat exchanger 4, which functions as a condenser (radiator).

[0023] The gaseous refrigerant guided to the outdoor heat exchanger 4 condenses into a high-pressure liquid refrigerant through heat exchange with the air (external gas) drawn in by the outdoor blower 40. The high-pressure liquid refrigerant is then depressurized as it passes through the expansion device 5, transforming into a low-pressure gas-liquid two-phase refrigerant. This gas-liquid two-phase refrigerant is then guided to the indoor heat exchanger 6, which functions as an evaporator (heat absorber), and exchanges heat with the air (internal gas) drawn in by the indoor blower 60 as it passes through the indoor heat exchanger 6.

[0024] As a result, the gas-liquid two-phase refrigerant absorbs heat from the air and evaporates, transforming into a low-temperature, low-pressure gas-phase refrigerant. The air passing through the indoor heat exchanger 6 is cooled by the latent heat of vaporization of the liquid-phase refrigerant and is then delivered as cold air to the air-conditioned (refrigerated) area by the indoor blower 60.

[0025] The low-temperature, low-pressure gaseous refrigerant after passing through the indoor heat exchanger 6 is guided to the storage tank 8 via the four-way valve 3. If incompletely evaporated liquid refrigerant is mixed in with the refrigerant, it is separated into liquid and gaseous refrigerant here. The low-temperature, low-pressure gaseous refrigerant separated from the liquid refrigerant is drawn from the storage tank 8 into the compressor 2, where it is compressed again into high-temperature, high-pressure gaseous refrigerant and discharged into the circulation loop 7.

[0026] On the other hand, when the air conditioner 1 is operating in heating mode, the four-way valve 3 is switched so that port 1 3a is connected to port 3c, and port 2 3b is connected to port 4 3d. When the air conditioner 1 starts operating in heating mode, the high-temperature, high-pressure gaseous refrigerant discharged from the compressor 2 is guided to the indoor heat exchanger 6 via the four-way valve 3 to exchange heat with the air passing through the indoor heat exchanger 6. In this case, the indoor heat exchanger 6 functions as a condenser.

[0027] As a result, the gaseous refrigerant in the indoor heat exchanger 6 exchanges heat with the air (internal gas) drawn in by the indoor blower 60 and condenses, changing into a high-pressure liquid refrigerant. The air passing through the indoor heat exchanger 6 is heated by the heat exchange with the gaseous refrigerant and is delivered as warm air to the area requiring air conditioning (heating) by the indoor blower 60.

[0028] The high-temperature liquid refrigerant after passing through the indoor heat exchanger 6 is guided to the expansion device 5, where it is depressurized and changes into a low-pressure gas-liquid two-phase refrigerant. This gas-liquid two-phase refrigerant is then guided to the outdoor heat exchanger 4, which functions as an evaporator, and evaporates by exchanging heat with the air (external gas) drawn in by the outdoor blower 40, changing into a low-temperature, low-pressure gas-phase refrigerant. The low-temperature, low-pressure gas-phase refrigerant after passing through the outdoor heat exchanger 4 is drawn into the compressor 2 via the four-way valve 3 and the accumulator 8, where it is compressed again into a high-temperature, high-pressure gas-phase refrigerant and discharged into the circulation loop 7.

[0029] In addition, in this embodiment, the air conditioner 1 can be operated in either cooling mode or heating mode, but the air conditioner 1 may also be a dedicated cooling unit or a dedicated heating unit that operates only in either cooling mode or heating mode.

[0030] Secondly, refer to Figure 2 The specific configuration of the compressor 2 used in the air conditioner 1 will be explained. Figure 2 This is a longitudinal sectional view of compressor 2. (For example...) Figure 2 As shown, compressor 2 is a so-called vertical rotary compressor, which includes a sealed container 10, a compression mechanism 11, and an electric motor 12 as its main components. In the following description, based on the relative positional relationship between the compression mechanism 11 and the electric motor 12, which are arranged along the central axis O1 of the sealed container 10 (described later), the side where the compression mechanism 11 is located is referred to as the lower side, and the side where the electric motor 12 is located is referred to as the upper side.

[0031] The sealed container 10 has a cylindrical peripheral wall 10a and stands vertically relative to the mounting surface, such as the base plate of the outdoor unit. A discharge pipe 10b is provided at the upper end of the sealed container 10. The discharge pipe 10b is connected to the first port 3a of the four-way valve 3 via the circulation loop 7. An oil reservoir 10c for accumulating lubricating oil is provided at the lower part of the sealed container 10.

[0032] The compression mechanism 11 is the mechanism for compressing the refrigerant. The compression mechanism 11 is housed in the lower part of the sealed container 10, immersed in lubricating oil. Figure 2 In the example shown, the compression mechanism 11 has a dual-cylinder structure, with a first cylinder 13, a second cylinder 14, and a rotating shaft 15 as its main components. The first cylinder 13 and the second cylinder 14 each have rollers (rotary plungers) and blades inside. Furthermore, the number of cylinders in the compression mechanism is not limited to two; it can be one or more.

[0033] The first cylinder 13 is fixed to the inner circumferential surface of the peripheral wall 10a of the sealed container 10. The second cylinder 14 is fixed to the lower surface of the first cylinder 13 via the partition plate 18.

[0034] A first bearing 20 is fixed above the first cylinder 13. The first bearing 20 covers the inner diameter portion of the first cylinder 13 from above and protrudes upward toward the first cylinder 13. The space surrounded by the inner diameter portion of the first cylinder 13, the partition plate 18, and the first bearing 20 constitutes the first cylinder chamber. The partition plate 18 corresponds to a sealing member defining the lower surface of the first cylinder chamber, and the first bearing 20 corresponds to a sealing member defining the upper surface of the first cylinder chamber.

[0035] A second bearing 22 is fixed below the second cylinder 14. The second bearing 22 covers the inner diameter of the second cylinder 14 from below and protrudes downwards from the second cylinder 14. The space enclosed by the inner diameter of the second cylinder 14, the partition plate 18, and the second bearing 22 constitutes the second cylinder chamber. The partition plate 18 corresponds to a sealing member defining the upper surface of the second cylinder chamber, and the second bearing 22 corresponds to a sealing member defining the lower surface of the second cylinder chamber. The first cylinder chamber and the second cylinder chamber are concentrically arranged with respect to the central axis O1 of the sealed container 10.

[0036] The first and second cylinder chambers are connected to the accumulator 8 via intake pipes 10d and 10e, which are part of the circulation loop 7. The gaseous refrigerant separated from the liquid refrigerant in the accumulator 8 is guided to the first and second cylinder chambers through these intake pipes 10d and 10e.

[0037] The axis of the rotating shaft 15 is coaxial with the central axis O1 of the sealed container 10, and passes through the first cylinder chamber, the second cylinder chamber, and the partition plate 18. The rotating shaft 15 has a first journal 27a, a second journal 27b, and a pair of crank pin portions (eccentric portions) 28a, 28b. That is, the rotating shaft 15 is configured as a crankshaft. The first journal 27a is supported by the first bearing 20 and is rotatable. The second journal 27b is supported by the second bearing 22 and is rotatable.

[0038] Furthermore, the rotating shaft 15 has an extension 27c that extends coaxially from the first journal 27a. The extension 27c passes through the first bearing 20 and protrudes upward toward the compression mechanism section 11. The rotor 33 of the motor section 12 (described later) is fixed to the extension 27c. In addition, the extension 27c is supported by the third bearing 24 (described later) and is rotatable. Thus, the rotating shaft 15 is supported not only by the first and second bearings 20 and 22, but also by the third bearing 24, and rotates about its axis (central axis O1) inside the sealed container 10.

[0039] Eccentric portions 28a and 28b are located between the first journal 27a and the second journal 27b. The eccentric portions 28a and 28b have, for example, a phase difference of 180 degrees, and their eccentricity relative to the central axis O1 of the sealed container 10 is the same. One eccentric portion (hereinafter referred to as the first eccentric portion) 28a is housed in the first cylinder chamber. The other eccentric portion (hereinafter referred to as the second eccentric portion) 28b is housed in the second cylinder chamber.

[0040] Rollers 16 and 17 are respectively fitted with the outer peripheral surfaces of the first eccentric portion 28a and the second eccentric portion 28b. A small gap is provided between the inner peripheral surfaces of rollers 16 and 17 and the outer peripheral surfaces of eccentric portions 28a and 28b, allowing rollers 16 and 17 to rotate relative to eccentric portions 28a and 28b. As a result, when the rotating shaft 15 rotates, rollers 16 and 17 rotate eccentrically within the cylinder chamber, and a portion of the outer peripheral surfaces of rollers 16 and 17 contacts the inner peripheral surface of the cylinder chamber via an oil film.

[0041] Blades (generally shown) are provided in cylinders 13 and 14 respectively. The blades are supported on cylinders 13 and 14 under radially inward force applied by the force-applying unit. The leading edge of each blade can slidably press against the outer circumferential surface of rollers 16 and 17. These blades, in cooperation with rollers 16 and 17, divide the cylinder chambers of cylinders 13 and 14 into an intake chamber and a compression chamber, respectively, and move in a direction protruding into or retracting from the cylinder chamber (advancing or retracting) as the rollers 16 and 17 rotate eccentrically relative to the cylinder chamber. Thus, by the advance and retraction of the blades relative to the cylinder chamber, the rollers 16 and 17 rotate eccentrically, thereby changing the volume of the intake and compression chambers of the cylinder chamber, and compressing the gaseous refrigerant drawn into the cylinder chamber from the aforementioned intake pipe.

[0042] The high-temperature, high-pressure gaseous refrigerant, compressed in the cylinder chambers of cylinders 13 and 24, is discharged into the sealed container 10 via a discharge valve mechanism (not shown). The discharged gaseous refrigerant rises inside the sealed container 10. Furthermore, during the operation of the compression mechanism 11, the lubricating oil stored in the oil reservoir 10c of the sealed container 10 becomes a mist and rises towards the discharge pipe 10b inside the sealed container 10 along with the flow of the gaseous refrigerant. An oil separator or similar device is assembled in the sealed container 10 to separate the lubricating oil contained in the rising gaseous refrigerant.

[0043] The motor unit 12 is the mechanism that drives the compression mechanism unit 11. The motor unit 12 is housed in the middle part along the central axis O1 of the sealed container 10, between the compression mechanism unit 11 and the discharge pipe 10b. The motor unit 12 includes a so-called internal rotor type motor, which has a rotor 33 fixed to the rotation shaft 15 and a stator 34 fixed to the inner circumferential surface of the peripheral wall 10a of the sealed container 10.

[0044] The rotor 33 is configured, for example, to have a cylindrical rotor core 33a fixed coaxially to the rotation shaft 15, and a plurality of permanent magnets disposed on the rotor core 33a (general illustration omitted). The rotor 33 is disposed coaxially with the stator 34 on the inner side of the stator 34 with a small gap (air gap).

[0045] The stator 34, for example, comprises a cylindrical stator core 34a and windings (coils) 34b wound around the stator core 34a, configured to surround the rotor 33. Multiple slots and teeth are alternately formed on the inner circumference of the stator core 34a. The coils 34b are wired in each slot and wound around each tooth. By energizing the coils 34b, the rotor 33 rotates relative to the stator 34 about the central axis O1, and the rotation shaft 15 rotates together with the rotor 33.

[0046] The rotating shaft 15 is supported by three bearings 20, 22, and 24 to enable rotation. The first bearing (hereinafter referred to as the first bearing) 20 of the three bearings 20, 22, and 24 is located in the middle part in the axial direction of the rotating shaft 15. The first bearing 20 has a first flange portion 20a that defines the upper surface of the first cylinder chamber in the first cylinder 13, and a first boss portion 20b that extends upwardly in a cylindrical shape continuously from the first flange portion 20a. The upper surface is the end face of one end of the first cylinder 13 in the axial direction of the rotating shaft 15 (along the direction of the central axis O1 of the sealed container 10).

[0047] The second bearing (hereinafter referred to as the second bearing) 22 is disposed at the lower end of the rotating shaft 15 in the axial direction. The second bearing 22 has a second flange portion 22a that defines the lower surface of the second cylinder chamber in the second cylinder 14, and a second boss portion 22b that extends downwardly in a cylindrical shape continuously with the second flange portion 22a. The lower surface is the end face of the other end side of the second cylinder 14 in the axial direction of the rotating shaft 15. That is, the first bearing 20 is equivalent to a component that closes the first cylinder chamber from above, and the second bearing 22 is equivalent to a component that closes the second cylinder chamber from below.

[0048] The third bearing (hereinafter referred to as the third bearing) 24 is positioned in a predetermined position on the axial direction of the rotating shaft 15, different from both the first bearing 20 and the second bearing 22. This predetermined position is located on the opposite side of the compression mechanism section 11, across the motor section 12, in the axial direction of the rotating shaft 15 (along the direction of the central axis O1 of the sealed container 10). Specifically, the upper end 15a of the rotating shaft 15, that is, the upper end of the extension 27c of the first journal 27a, is located in the predetermined position. The upper end of the rotating shaft 15 is one end in the axial direction of the rotating shaft 15.

[0049] The form of bearing 1 20, bearing 22, and bearing 3 24 is not particularly limited. Figure 2 The first bearing 20 and the second bearing 22 shown are sliding bearings, and the third bearing 24 is a rolling bearing having an inner ring 24a, an outer ring 24b, and rolling elements 24c. The inner ring 24a and the outer ring 24b are concentrically arranged opposite each other with respect to the central axis O1. The inner ring 24a is a rotating ring, and the outer ring 24b is a stationary ring. The rolling elements 24c are multiple balls or rollers held by a retainer or the like, rolling between tracks formed on the outer periphery of the inner ring 24a and the inner periphery of the outer ring 24b, respectively.

[0050] A muffler (hereinafter referred to as the first muffler) 41 is provided above the first bearing 20, covering the first bearing 20. The first muffler 41, for example, suppresses pulses and noise caused by refrigerant discharged from the compression chamber of the first cylinder 13 into the sealed container 10. The first muffler 41 covers the upper surface of the first bearing 20, in other words, the first cylinder chamber in the first cylinder 13, forming a first muffler chamber 43 between itself and the first bearing 20. Furthermore, a muffler (hereinafter referred to as the second muffler) 42 is provided below the second bearing 22, covering the second bearing 22. The second muffler 42, for example, suppresses pulsations and noise caused by refrigerant discharged from the compression chamber of the second cylinder 14 into the sealed container 10. The second muffler 42 covers the lower surface of the second bearing 22, in other words, the second cylinder chamber in the second cylinder 14, forming a second muffler chamber 44 between itself and the second bearing 22.

[0051] In addition, such as Figure 2As shown, the motor section 12 includes a winding tube 26. The winding tube 26 is a component for wiring the coil 34b wound on the stator core 34a of the stator 34. Furthermore, the winding tube 26 also serves as a retaining component for holding the third bearing 24. Figure 2 as well as Figure 3 As shown, the winding tube 26 is disposed on the upper surface 34c of the stator 34. Figure 3 This is a perspective view schematically showing the state in which the winding tube 26 is assembled and disposed on the upper surface 34c of the stator 34. The upper surface 34c is the end face of one end of the rotating shaft 15 in the stator 34 in the axial direction (along the direction of the central axis O1 of the sealed container 10). The winding tube 26 is assembled to the upper surface 34c of the stator 34 by the tension of the coil 34b wound on the stator core 34a. The material of the winding tube 26 is not particularly limited. In this embodiment, as an example, it is assumed that the winding tube 26 is formed of a metal plate. However, the winding tube 26 may also be made of resin or other materials besides metal. In addition, in this embodiment, as an example, the winding tube 26 is considered as a component of the motor section 12, but the winding tube 26 may also be a separate part independent of the motor section 12.

[0052] Figure 4 This is a schematic three-dimensional view of the winding tube 26. (Example) Figure 4 As shown, the winding tube 26 is composed of three main elements: part 1 52, part 2 54, and part 3 56. Each of the aforementioned parts 52, 54, and 56 is formed, for example, by processing the metal plate that becomes the winding tube 26 through cutting, drilling, bending, or other processes. Figure 5 It is a perspective view that schematically shows the shape of the winding tube 26 formed by processing the metal plate in this way to form part 1 52, part 2 54, and part 3 56.

[0053] like Figure 2 as well as Figure 3 As shown, the first part 52 is the portion that serves as a base when the winding tube 26 is assembled onto the upper surface 34c of the stator 34, and also includes the coil wiring portion 53 for wiring the coil 34b. The coil 34b, wound around the stator core 34a of the stator 34, is arranged in the first part 52, thereby exerting tension on the first part 52 due to the winding from the coil 34b. This tension acts to press and hold the first part 52 against the upper surface 34c. Thus, the winding tube 26 is assembled onto the stator 34 via the first part 52.

[0054] like Figures 3 to 5As shown, the overall outline shape of part 52 is an octagon. However, the outline shape of part 52 is not limited to the octagon shown in the figure. Taking into account errors during the molding of part 52, such an outline shape can be any polygon that converges to the inner periphery of the peripheral wall 10a of the generally cylindrical sealed container 10.

[0055] Part 1 52 has an opening (first opening) 52a at the center of an octagonal shape that forms its outline. The opening 52a is a roughly circular opening concentric with the central axis O1 of the sealed container 10. The diameter of the opening 52a is larger than the outer diameter of the outer ring 24b of the third bearing 24.

[0056] The annular portion (first annular portion) 52b surrounding the opening 52a has a plurality of slots 52c and teeth 52d. These slots 52c and teeth 52d are coil wiring portions 53 in the first part 52 where coils 34b are arranged. Slots 52c are missing portions of the annular portion 52b and are portions where coils 34b are arranged on the stator core 34a wound on the stator 34. Teeth 52d are part of the wall portion (unmissed portion) of the annular portion 52b and are portions where coils 34b are wound and arranged in slots 52c. Therefore, teeth 52d have an insulating portion on their surface relative to coils 34b. The insulating portion may be, for example, a part separate from the winding tube 26, or a coating formed by insulating the surface of teeth 52d.

[0057] These slots 52c and teeth 52d are arranged alternately at approximately equal intervals in the circumferential direction of the opening 52a. Thus, the teeth 52d protrude towards the opening 52a relative to the annular portion 52b. For example, coils 34b wound around adjacent teeth 52d in the circumferential direction are arranged together in the slots 52c. It is sufficient that the number of slots 52c matches the number of slots in the stator core 34a, and the number of teeth 52d matches the number of teeth in the stator core 34a. The slots 52c are positioned at positions corresponding to the slots in the stator core 34a, and the teeth 52d are positioned at positions corresponding to the teeth in the stator core 34a. In this embodiment, as... Figure 5 As shown as an example, the annular portion 52b has 9 slots 52c and 9 teeth 52d.

[0058] like Figure 4 as well as Figure 5 As shown, slot 52c narrows as it moves from the outer periphery of the annular portion 52b toward the inner periphery. Slot 52c communicates with opening portion 52a at opening portion 52e.

[0059] The tooth 52d is configured to include a drooping portion 52f and an upright portion 52g. The drooping portion 52f hangs down from the circumferential edge of the tooth 52d, guiding the coil 34b wound on the tooth 52d and preventing bending. The upright portion 52g rises from the front end of the tooth 52d (the protruding end towards the center of the opening 52a) towards the side opposite to the drooping portion 52f (above), preventing the coil 34b wound on the tooth 52d from falling off the tooth 52d.

[0060] Furthermore, the annular portion 52b has a plurality of flanges 52h and a plurality of claw fixing portions 52i. The flanges 52h are portions used to stabilize the position of the winding tube 26 on the upper surface 34c of the stator 34 and are part of the wall portion of the annular portion 52b. The claw fixing portions 52i are portions used to position and fix the second claw 54d (described later) supporting the second portion 54 relative to the first portion 52. These flanges 52h and claw fixing portions 52i are alternately arranged at approximately equal intervals in the circumferential direction of the opening 52a. In this embodiment, as... Figure 5 As shown as an example, the annular portion 52b has four flanges 52h and three claw fixing portions 52i at positions corresponding to each side of the octagonal shape that forms its outline. The number of flanges 52h and claw fixing portions 52i does not need to be exactly the same as the number of slots 52c and teeth 52d. In addition, a third portion 56 is provided at position P52 corresponding to the remaining side of each side of the octagonal shape in the annular portion 52b where no flanges 52h and claw fixing portions 52i are provided.

[0061] The flange 52h hangs down from the outer periphery of the annular portion 52b. In this embodiment, as... Figure 5 As shown as an example, the flange 52h hangs down from one edge of the octagonal shape of the annular portion 52b, which is the outline shape. That is, the flange 52h hangs down in the same direction as the hanging portion 52f.

[0062] The claw fixing part 52i is a portion of the wall (undamaged part) of the annular part 52b, rising from the outer periphery of the annular part 52b toward the side opposite to the flange 52h (above). The claw fixing part 52i has a slit 52j. The slit 52j is a damaged portion of the annular part 52b, and is the part where the front end 54g of the second claw 54d of the second part 54 (described later) is inserted and hooked.

[0063] like Figure 2 as well as Figure 3 As shown, the second part 54 is the portion covering the base portion of the winding tube 26, i.e., the portion above the first part 52, and includes the bearing retaining portion 55 that holds the third bearing 24. By holding the third bearing 24 in the second part 54, the third bearing 24 is positioned and fixed relative to the rotation axis 15.

[0064] like Figures 3 to 5 As shown, the overall outline shape of the second part 54 is a roughly rectangular shape with curved corners. However, the outline shape of the second part 54 is not limited to the roughly rectangular shape shown in the figure. This outline shape takes into account the errors during the molding of the second part 54, and for example, it can be any shape that abuts against the inner periphery of the peripheral wall 10a of the roughly cylindrical sealed container 10.

[0065] Part 2, 54, has an opening (second opening) 54a at its center, which is roughly rectangular in shape. The opening 54a is approximately circular in shape and concentric with the axis of rotation 15 (the central axis O1 of the sealed container 10). The diameter of the opening 54a is only large enough to allow the rotation axis 25 to be inserted. Figures 3 to 5 In the example shown, the diameter of the opening 54a is approximately the same as or slightly larger than the outer diameter of the extension 27c of the rotating shaft 15.

[0066] The annular portion (second annular portion) 54b surrounding the opening 54a has a plurality of first claws 54c and second claws 54d. These first claws 54c and second claws 54d stand in the same direction relative to the rest of the annular portion 54b.

[0067] exist Figures 3 to 5 In the example shown, four first claws 54c are arranged at approximately equal intervals around the opening 54a. These four first claws 54c are the bearing retaining parts 55 in the second part 54 that hold the third bearing 24. The number of first claws 54c is only required to be sufficient to position and fix the third bearing 24 relative to the rotation axis 15 and stabilize the posture of the third bearing 24. Therefore, the number of first claws 54c can be three or less, or five or more, and can be arbitrarily set according to the size, weight, etc. of the third bearing 24.

[0068] The first claw 54c is an elastic piece used to hold the third bearing 24. In this embodiment, as an example, the first claw 54c is formed by cutting and erecting a portion of the annular portion 54b toward the opening 54a. The front end 54e of the cut and erected first claw 54c is hooked and further bent toward the opening 54a. The cutting and erecting height of the first claw 54c, that is, the erecting height from the annular portion 54b, is determined according to the assembly width of the third bearing 24. Figure 2 The vertical dimension (of the assembly) is set to be above the assembly width, and for example, set to be approximately the same as the assembly width. The front end 54e bends in a hook shape toward the opening 54a at this upright height position.

[0069] The opposing spacing between a pair of first pawls 54c in the opposite position of the four first pawls 54c is set above the outer diameter of the third bearing 24, that is, above the outer diameter of the outer ring 24b. Figure 2 The dimension in the left-right direction (as an example) is set to be approximately the same as the outer diameter of the outer ring 24b. Therefore, as... Figure 6 As shown, the first claw 54c holds the third bearing 24 by clamping the outer ring 24b through the front end 54e. Figure 6 This diagram, taken from below, schematically shows the state in which the first claw 54c holds the third bearing 24. At this time, the four first claws 54c recover their deformation after elastically deforming in a manner that tilts outward relative to the opening 54a. In other words, the first claws 54cs in opposing positions among the four first claws 54cs recover their deformation after elastically deforming in a manner that separates them from each other.

[0070] A through hole 54f corresponding to the first claw 54c is formed at the cut-out, upright portion of the annular portion 54b. Figures 3 to 5 In the example shown, corresponding to the four first claws 54c, the annular portion 54b has four through holes 54f. These through holes 54f function as passageways for the refrigerant compressed by the compression mechanism 11 within the sealed container 10, and also function as deformation allowances when assembling the winding tube 26 to the inner periphery of the peripheral wall 10a of the sealed container 10.

[0071] exist Figures 3 to 5 In the example shown, three second claws 54d are provided at approximately equal intervals along the outer periphery of the opening 54a in the circumferential direction. These three second claws 54d are elastic pieces used to fix the second part 54 to the first part 52. The number of second claws 54d is only required to be sufficient to position and fix the second part 54 relative to the first part 52 and to stabilize the posture of the second part 54. Therefore, the number of second claws 54d can be two or less, or four or more, and can be arbitrarily set according to the size, weight, etc. of the winding tube 26.

[0072] In this embodiment, such as Figure 5 As shown as an example, the annular portion 54b has three second claws 54d at positions corresponding to the three sides of its generally rectangular shape. Additionally, a third portion 56 is positioned at position P54 corresponding to the remaining side of the generally rectangular shape of the annular portion 54b where no second claws 54d are located. The circumferential positions of these three second claws 54d in the annular portion 54b correspond to the positions of the three claw fixing portions 52i of the first portion 52 in the circumferential direction of the annular portion 52b.

[0073] The second claw 54d rises from the outer periphery of the annular portion 54b in the same direction as the first claw 54c. The front end 54g of the raised second claw 54d bends in a hook shape in the same direction as the front end 54e of the first claw 54c. The height at which the second claw 54d rises from the annular portion 54b is set such that, when in the second state described later, the front end 54g is inserted into the slit 52j. The front end 54g bends in a hook shape in the same direction as the front end 54e at the height of the raised second claw 54d. Thus, the front end 54g can be inserted into the slit 52j of the claw fixing portion 52i and engage with the edge of the slit 52j. At this time, the three second claws 54d elastically deform and then recover their deformation after tilting outward relative to the opening 54a.

[0074] Furthermore, the annular portion 54b has a plurality of support portions 54h on its outer periphery. The support portions 54h correspond to the curved corners of the generally rectangular second portion 54 that bends at each corner. Figures 3 to 5 In the example shown, the annular portion 54b has four support portions 54h. These support portions 54h can be configured to abut against the inner periphery of a cylindrical housing surrounding the stator 34 of the motor unit 12, or the inner periphery of the peripheral wall 10a of a generally cylindrical sealed container 10. When the support portions 54h are configured in this way, a portion of the second part 54 can be positioned and fixed by abutting against the inner periphery of, for example, the cylindrical housing of the stator 34. At this time, the second part 54 is fixed to the inner periphery by pressing, thermoforming, or the like, with the support portions 54h abutting against the inner periphery of the housing. In this state, the parts of the outer periphery of the annular portion 54b other than the support portions 54h, such as the second claw 54d and the third part 56, do not contact the inner periphery of the housing.

[0075] Part 3, 56, is the portion of the winding tube 26 that connects Part 1, 52, and Part 2, 54. Figures 3 to 5 In the example shown, part 3 56 connects the designated position P52 of part 1 52 with the designated position P54 of part 2 54. The designated position P52 corresponds to the remaining side of the octagonal shape in the annular portion 52b of part 1 52 where the flange 52h and the claw fixing portion 52i are not disposed. The designated position P54 corresponds to the remaining side of the generally rectangular shape in the annular portion 54b of part 2 54 where the second claw 54d is not disposed.

[0076] In the first state, the third part 56 connects the first part 52 and the second part 54 in such a continuous manner that the first part 52 and the second part are on approximately the same plane. The first state is the state before the bearing retaining part 55 of the second part 54, i.e., the four first claws 54c, retain the third bearing 24. Figure 5This diagram illustrates an example of the configuration of the winding tube 26 in the first state. Furthermore, in the second state, the third part 56 connects the first part 52 and the second part 54 in a manner where they are opposed to each other along the axial direction of the rotation axis 15 (along the direction of the central axis O1). The second state is the state before the four first claws 54c of the second part 54 hold the third bearing 24. Figure 3 as well as Figure 4 This is a diagram showing an example of the shape of the winding tube 26 in the second state.

[0077] That is, part 3, 56, is configured to be elastically deformable during the state transition from state 1 to state 2. Figure 4 In the example shown, the third part 56 has two deformable portions 56a and 56b that are arranged at opposite intervals to the first part 52 and the second part 54 in the second state along the axial direction of the rotation axis 15 (along the direction of the central axis O1). The deformable portion 56a is a portion that bends upwards, approximately perpendicularly to the annular portion 52b, at a predetermined position P52 of the first part 52 in the second state. The deformable portion 56b is a portion that bends downwards, approximately perpendicularly to the annular portion 54b, at a predetermined position P54 of the second part 54 in the second state. These deformable portions 56a and 56b may also have grooves, recesses, etc., to facilitate the definition of the deformation shape.

[0078] Thus, the winding tube 26, constructed with Part 1 52, Part 2 54, and Part 3 56 as the main elements, is as follows: Figure 3 As shown, when the components are assembled on the upper surface 34c of the stator 34, the following sequence is generally followed as an example. Furthermore, in this case, the third bearing 24 is in a state where the inner ring 24a is assembled to the extension 27c of the rotating shaft 15 by pressing or other means.

[0079] First of all, Figure 5 In the first state shown, the first portion 52 of the winding tube 26 is positioned on the upper surface 34c of the stator 34. At this time, the position of the slot 52c of the first portion 52 is aligned with the position of the slot in the stator core 34a, and the position of the tooth 52d is aligned with the position of the tooth in the stator core 34a. Then, the coil 34b is wound onto the stator core 34a. Thus, the coil 34b is wound around the tooth 52d, and wiring is performed on the coil 34b wound around the tooth 52d. As a result, the winding tube 26 is assembled on the upper surface 34c of the stator 34 using the tension of the coil 34b wound on the stator core 34a.

[0080] Next, the third part 56 is elastically deformed at the deformable portions 56a and 56b so that the second part 54 and the first part 52 are positioned opposite each other in the axial direction (along the direction of the central axis O1) of the rotation shaft 15. At this time, while the front end 54e of the first claw 54c of the second part 54 is along the outer ring 24b of the third bearing 24 and the front end 54g of the second claw 54d is along the claw fixing portion 52i of the first part 52, the opening 54a of the second part 54 is inserted into the extension portion 27c of the rotation shaft 15. At this time, the first claw 54c and the second claw 54d elastically deform in a way that tilts outward relative to the opening 54a.

[0081] Then, the deformable portions 56a and 56b of part 3 56 are elastically deformed until they become Figure 3 as well as Figure 4 Up to the second state shown. At this point, the first claw 54c recovers its deformation by clamping the outer ring 24b with its front end 54e. As a result, the third bearing 24 is positioned and fixed relative to the rotation axis 15 by the first claw 54c, achieving stability of its posture. Furthermore, the second claw 54d elastically recovers its shape by inserting its front end 54g into the slit 52j of the claw fixing part 52i. As a result, the second part 54 is positioned and fixed relative to the first part 52 by the second claw 54d, achieving stability of its posture.

[0082] In addition, in this embodiment, the claw fixing part 52i is provided in the first part 52 and the second claw 54d is provided in the second part 54. However, it is also possible to do the opposite, with the claw fixing part 52i provided in the second part 54 and the second claw 54d provided in the first part 52.

[0083] Thus, according to this embodiment, as Figure 2 As shown, the first bearing 20 is disposed in the middle part of the rotating shaft 15, the second bearing 22 is disposed in the lower part of the rotating shaft 15, and the third bearing 24 is disposed in the upper part of the rotating shaft 15. That is, the winding tube 26 has a second portion 54 including a bearing holding portion 55, thereby allowing the third bearing 24 to be disposed in the upper part of the rotating shaft 15 via the second portion 54. Thus, in addition to supporting the middle part of the rotating shaft 15 for rotation using the first bearing 20 and supporting the lower part for rotation using the second bearing 22, the upper part can also be supported for rotation using the third bearing 24.

[0084] Therefore, even when the motor unit 12 is positioned above and the compression mechanism unit 11 is positioned below within the sealed container 10, the rotating shaft 15 can be supported for rotation by the third bearing 24 at a position above the motor unit 12. Thus, compared to the case where the upper part of the rotating shaft 15 is not supported by a bearing, by providing a third bearing 24 in addition to the first bearing 20 and the second bearing 22, the rotating shaft 15 can be supported at both ends. As a result, the oscillation and rotation of the rotating shaft 15 can be suppressed, and the increase in noise caused by vibration can be suppressed.

[0085] Furthermore, according to this embodiment, the first part 52 arranging the coil 34b and the second part 54 holding the third bearing 24 are connected by the third part 56 to form the winding tube 26. That is, it is not necessary to purchase additional parts for holding the third bearing 24 besides existing parts; it is sufficient to process a metal plate having the second part 54 and the third part 56 in addition to the first part 52 into the winding tube 26. Therefore, the third bearing 24 can be positioned and fixed by the winding tube 26 with a very simple structure, and the rotating shaft 15 can be supported with higher precision by the three bearings 20, 22, and 24 including the third bearing 24.

[0086] Furthermore, according to this embodiment, by engaging the elastically deformable second claw 54d with the slit 52j of the claw fixing portion 52i, the second part 54 can be positioned and fixed to the first part 52. That is, by deforming the third part 56 to change the winding tube 26 from the first state to the second state, the second claw 54d can be elastically deformed, and the second part 54 can be positioned and fixed to the first part 52 using the second claw 54d. Furthermore, the bearing holding portion 55 is configured with four elastically deformable first claws 54c. Therefore, similarly, by changing the winding tube 26 from the first state to the second state, the first claws 54c can be elastically deformed, and the third bearing 24 can be easily held using the first claws 54c.

[0087] In addition, the winding tube 26 of the first embodiment described above ( Figures 3 to 5 This is merely one example of a wound tube and is not limited to the illustrated form. Hereinafter, other forms of the wound tube will be described as embodiments 2 to 4. Furthermore, the basic components of the compressors in embodiments 2 to 4 are the same as those of compressor 2 in embodiment 1. Figure 2 Therefore, the description of the basic components of this compressor will be omitted or simplified below, and the features of the winding tube in the second to fourth embodiments, that is, the differences between the winding tube 26 in the first embodiment and the first embodiment, will be described in detail. At this time, the same reference numerals will be used for components that are the same as or similar to those in the first embodiment.

[0088] (Second Implementation)

[0089] Figure 7 This is a perspective view that schematically illustrates the winding tube 26a of the second embodiment. (See attached image.) Figure 7 As shown, the winding tube 26a is the same as the winding tube 26, and is composed of three main elements: part 1 52, part 2 54, and part 3 56.

[0090] The annular portion 54b of the second part 54 has a plurality of first claws 54c and a plurality of second claws 54d, and a plurality of ribs 54i. These ribs 54i are used to adjust the rigidity of the second part 54, specifically the winding tube 26a.

[0091] exist Figure 7 In the example shown, four ribs 54i are arranged at approximately equal intervals in the circumferential direction of the opening 54a. Each of these four ribs 54i is positioned between adjacent first claws 54c in the circumferential direction. That is, the first claws 54c and ribs 54i are arranged alternately in the circumferential direction. The ribs 54i only need to be able to appropriately adjust the rigidity of the second part 54, or more specifically, the winding tube 26a. Therefore, the number and size of the ribs 54i are not limited to the illustrated arrangement. For example, the number of ribs 54i can be three or less, or five or more.

[0092] exist Figure 7 In the example shown, the rib 54i is formed by recessing the annular portion 54b downwards (in the second state, in the direction close to the first portion 52). Furthermore, the rib 54i is continuous in a curved line that generally follows the support portion 54h.

[0093] According to this embodiment, by providing such a rib 54i, the rigidity of the second part 54, specifically the winding tube 26a, can be reduced by the amount of the rib 54i compared to the first embodiment. By reducing the rigidity of the winding tube 26a in this way, for example, when assembling the winding tube 26a onto the upper surface 34c of the stator 34, the first claw 54c and the second claw 54d can be easily elastically deformed, thereby improving workability.

[0094] (Third Implementation)

[0095] Figure 8 This is a perspective view that schematically illustrates the winding tube 26b of the third embodiment. (See attached image.) Figure 8 As shown, the winding tube 26b is the same as the winding tube 26, and is composed of three main elements: part 1 52, part 2 54, and part 3 56.

[0096] The annular portion 54b of the second part 54 has a plurality of first claws 54c and a plurality of second claws 54d, and also has a plurality of ribs 54j. These ribs 54j are similar to the ribs 54i of the second embodiment. Figure 7The same applies to the part used to adjust the rigidity of part 2, 54, or more specifically, the winding tube 26b.

[0097] exist Figure 8 In the example shown, four ribs 54j are arranged at approximately equal intervals in the circumferential direction of the opening 54a. Each of these four ribs 54j is positioned between adjacent first claws 54c in the circumferential direction. That is, the first claws 54c and ribs 54j are arranged alternately in the circumferential direction. The ribs 54j only need to be able to appropriately adjust the rigidity of the second part 54, or more specifically, the winding tube 26b. Therefore, the number and size of the ribs 54j are not limited to the illustrated arrangement. For example, the number of ribs 54j can be three or less, or five or more.

[0098] exist Figure 8 In the example shown, rib 54j is formed by recessing the annular portion 54b downwards (in the second state, in the direction close to the first portion 52). Furthermore, rib 54j is continuous in a generally straight line along the radial direction (radial direction) relative to the center of the opening portion 54a.

[0099] According to this embodiment, by providing such a rib 54j, the rigidity of the second part 54, and thus the winding tube 26b, can be increased by the amount of the rib 54j compared to the first embodiment. By increasing the rigidity of the winding tube 26b in this way, for example, the durability of the winding tube 26b can be improved.

[0100] (Fourth implementation)

[0101] Figure 9 This is a perspective view that schematically illustrates the winding tube 26c of the fourth embodiment. (See attached image.) Figure 9 As shown, the winding tube 26c is the same as the winding tube 26, and is composed of three main elements: part 1 52, part 2 54, and part 3 56.

[0102] The annular portion 54b of the second part 54 has a plurality of first claws 54c and a plurality of second claws 54d, and also has a plurality of slits 54k. These slits 54k are used to adjust the rigidity (deformation allowance) of the second part 54, specifically the winding tube 26c. Furthermore, the slits 54k, together with the through hole 54f, form a passage for the refrigerant compressed by the compression mechanism 11 within the sealed container 10.

[0103] exist Figure 9In the example shown, four slits 54k are arranged at approximately equal intervals in the circumferential direction of the opening 54a. Each of these four slits 54k is positioned between adjacent first claws 54c in the circumferential direction. That is, the first claws 54c and the slits 54k are arranged alternately in the circumferential direction. The slits 54k only need to be able to appropriately adjust the rigidity of the second part 54, or more specifically, the winding tube 26c. Therefore, the number and size of the slits 54k are not limited to the illustrated arrangement. For example, the number of slits 54k can be three or less, or five or more.

[0104] exist Figure 9 In the example shown, the slit 54k is formed by the vertically penetrating annular portion 54b. Furthermore, the slit 54k is continuous in a straight line approximately along the support portion 54h.

[0105] According to this embodiment, by providing such a slit 54k, compared to the first embodiment, the rigidity of the second part 54, specifically the winding tube 26c, can be reduced by the amount of the slit 54k. By reducing the rigidity of the winding tube 26c in this way, for example, the workability when assembling the winding tube 26c onto the upper surface 34c of the stator 34 can be improved. Furthermore, since the slit 54k serves as a passage for the refrigerant compressed by the compression mechanism 11 within the sealed container 10, the conductivity of the refrigerant within the sealed container 10 can be improved.

[0106] The various embodiments of the present invention have been described above. These embodiments are provided as examples and are not intended to limit the scope of the invention. These new embodiments can be implemented in various other ways, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their variations are included in the scope and spirit of the invention, and are included in the scope of the invention as described in the claims and its equivalents.

[0107] In the above embodiments, the winding tubes 26, 26a, 26b, and 26c are configured such that the first part 52 and the second part 54 are connected by the third part 56, but the configuration of the winding tube is not limited to this. For example, the part corresponding to the third part may be omitted, and the part corresponding to the first part and the part corresponding to the second part may be formed as different parts and assembled to form the winding tube. Furthermore, in the above embodiments, the winding tubes 26, 26a, 26b, and 26c are formed by processing a metal sheet, but for example, the winding tube may also be formed by processing resin. In this case, the part corresponding to the first part and the part corresponding to the second part may be connected by the part corresponding to the third part, or the part corresponding to the third part may be omitted, and the part corresponding to the first part and the part corresponding to the second part may be formed as different parts.

Claims

1. A compressor comprising: a cylindrical hermetic container; a compression mechanism portion having a rotary shaft rotating around an axis in an inside of the hermetic container to compress a refrigerant; a motor portion having a rotor fixed to the rotary shaft and a stator fixed to an inner periphery of the hermetic container to surround the rotor and wound with a coil, the motor portion driving the rotary shaft; a bearing disposed on a side opposite to the compression mechanism portion in the axis direction of the rotary shaft across the motor portion to support the rotary shaft so as to be rotatable; and a bobbin having a first portion including a coil wiring portion wiring the coil wound on the stator and a second portion including a bearing holding portion holding the bearing, the bobbin being disposed at one end portion in the axis direction of the stator; the bobbin further having a third portion linking the first portion and the second portion in addition to the first portion and the second portion, the third portion linking the first portion and the second portion in a manner that the first portion and the second portion are continuous on substantially the same plane in a first state before the bearing holding portion holds the bearing, and linking the first portion and the second portion in a manner that the first portion and the second portion are opposed in the axis direction in a second state after the bearing holding portion holds the bearing.

2. The compressor according to claim 1, wherein the third portion has a deformation portion disposed corresponding to an opposed interval of the first portion and the second portion in the axis direction in the second state.

3. The compressor according to claim 1, wherein the bearing holding portion has a first claw elastically deformed to hold the bearing at a time of state transition from the first state to the second state.

4. The compressor according to claim 1, wherein either one of the first portion and the second portion has a second claw elastically deformable to support the second portion with respect to the first portion in the second state, and the other one has a claw fixing portion positioning and fixing the second claw in the second state.

5. The compressor according to claim 1, wherein the first portion has an opening portion concentric with the rotary shaft in the first state and an annular portion including the opening portion, the coil wiring portion is a defective portion partially defective an inner periphery portion of the annular portion, the coil wiring portion has a plurality of slots wiring the coil wound on the stator and a plurality of teeth being a part of a wall portion of the annular portion disposed between the slots adjacent in a circumferential direction of the opening portion, and the coil is wound and wired in the slots.

6. The compressor according to claim 5, wherein the plurality of teeth have an insulating portion with respect to the coil wired in the slots in a surface layer integrally or separately.

7. An air conditioner comprising: the compressor according to any one of claims 1 to 6; and a condenser connected to the compressor. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ An expansion device is connected to the condenser. An evaporator is connected to the expansion device.

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