WO2022264361A1

WO2022264361A1 - Hermetic compressor and refrigeration cycle apparatus

Info

Publication number: WO2022264361A1
Application number: PCT/JP2021/023040
Authority: WO
Inventors: 暁和和泉; 友宏井柳; 貴彦村上
Original assignee: 三菱電機株式会社
Priority date: 2021-06-17
Filing date: 2021-06-17
Publication date: 2022-12-22

Abstract

This hermetic compressor comprises: an electric motor having a hollow cylindrical stator having a stator core and a stator coil wound around the stator core, and a rotor provided so as to be rotatable inside the stator; a compressor mechanism that is driven by the electric motor and that compresses non-flammable refrigerant including iodine; and a hermetic container that accommodates the electric motor and the compressor mechanism. The stator coil has an aluminum core wire.

Description

Hermetic compressor and refrigeration cycle equipment

The present disclosure relates to a hermetic compressor and a refrigeration cycle device.

In recent years, there has been a growing awareness of environmental conservation, and refrigerants used in refrigeration cycle equipment are expected to have a reduced ozone depletion potential (ODP) and global warming potential (GWP). requested.

Therefore, conventionally, the use of refrigerants that can keep the ozone depletion potential and global warming potential low has been studied. Refrigerants with low global warming potential tend to be highly flammable, so in recent years, the use of nonflammable refrigerants with low global warming potential and containing iodine, such as R466A refrigerant, has been studied. is underway.

On the other hand, the stator of an electric motor used in a hermetic compressor or the like used in a conventional refrigeration cycle apparatus includes a stator core having a plurality of magnetic pole teeth along the inner periphery, and each magnetic pole of the stator core. and a copper winding wound around the teeth via an insulating member (see, for example, Patent Document 1). In Patent Document 1, a winding receiver is fixed to the end face side of the stator core, and the winding receiver holds a connecting wire between two copper windings and an end wire of another copper winding. A holding portion and an insertion portion into which the pressure contact projection of the pressure contact terminal is inserted are formed. The press-connecting protrusion of the press-contact terminal is inserted into the insertion portion of the winding receiver, and the connecting wire and terminal wire held by the holding portion are press-fitted into the press-contact slot. A blade portion is formed on the peripheral edge of the pressure contact slot, and when the connecting wire and the terminal wire are press-fitted into the pressure contact slot, the coating between the connecting wire and the terminal wire is broken by the blade portion, and the connecting wire and the terminal wire are separated. are electrically connected via pressure contact terminals.

JP 2015-70652 A

In the stator of the electric motor described in Patent Document 1, when the connecting wire and the terminal wire are press-fitted into the pressure contact slot, the coating of the connecting wire and the terminal wire is broken by the blade portion, exposing the copper core wire. Nonflammable refrigerants containing iodine, such as R466A refrigerant, react with copper and cause corrosion. Therefore, in the stator of a conventional electric motor, corrosion progresses from the copper core wire when the R466A refrigerant adheres to the exposed copper core wire in an environment where a nonflammable refrigerant containing iodine such as R466A refrigerant is used. , there is a problem that there is a possibility of leading to poor conduction.

The present disclosure has been made to solve the above problems, and aims to provide a hermetic compressor and a refrigeration cycle device that are highly reliable without corrosion of the stator windings.

A hermetic compressor according to the present disclosure includes a hollow cylindrical stator having a stator core and a stator winding wound around the stator core; an electric mechanism unit having a rotor; a compression mechanism unit that is driven by the electric mechanism unit and compresses a nonflammable refrigerant containing iodine; and a sealed container that houses the electric mechanism unit and the compression mechanism unit. The stator winding has an aluminum core wire.

In the refrigeration cycle device according to the present disclosure, the hermetic compressor, the outdoor heat exchanger, the throttle device, and the indoor heat exchanger are connected by refrigerant piping, and the nonflammable refrigerant containing iodine is It has a circulating refrigerant circuit.

According to the hermetic compressor and the refrigeration cycle apparatus according to the present disclosure, aluminum is used instead of copper for the core wires of the stator windings. Therefore, when a nonflammable refrigerant containing iodine such as a mixed refrigerant containing trifluoroiodomethane (CF ₃ I) is used as a refrigerant circulating in a refrigerant circuit of a refrigeration cycle device equipped with a hermetic compressor, However, the risk of corrosion of the core wire of the stator winding can be reduced, and the risk of poor conduction of the compressor can be reduced, so high reliability can be obtained.

1 is a schematic diagram showing an example of an internal configuration of a hermetic compressor according to an embodiment; FIG. It is a cross-sectional schematic of the compression mechanism part of the hermetic compressor which concerns on embodiment. FIG. 3 is a cross-sectional view of an electric mechanism portion of the hermetic compressor according to the embodiment; FIG. 4 is an explanatory diagram showing the relationship between a restraint portion, restraint grooves, a connecting wire, and a press contact terminal in the hermetic compressor according to the embodiment; FIG. 5 is an explanatory diagram showing how the stator windings and the connecting wires of the hermetic compressor according to the embodiment are electrically connected to the lead wires. FIG. 4 is an explanatory view showing a state before the coated portions of the stator winding and the coated portion of the connecting wire of the hermetic compressor according to the embodiment are peeled off; FIG. 4 is an explanatory view showing a state in which the core wire exposed by peeling off the coated portion of the stator winding and the coated portion of the connecting wire of the hermetic compressor according to the embodiment is electrically connected to the press contact terminal; It is the reaction test result of the metal catalyst in R466A refrigerant environment. 1 is a schematic configuration diagram of a refrigeration cycle device provided with a hermetic compressor according to an embodiment; FIG.

A hermetic compressor 100 and a refrigeration cycle device 200 according to an embodiment will be described below with reference to the drawings. It should be noted that the present disclosure is not limited by the embodiments described below. Also, in the following drawings, the size relationship of each component may differ from the actual size. Also, in the following description, terms representing directions (for example, "up", "down", "right", "left", "front", "back", etc.) are used as appropriate for ease of understanding. For the purpose of description, these terms are not intended to limit this disclosure. Unless otherwise specified, these directional terms mean directions when the hermetic compressor 100 is viewed from the front side (front side). Also, in each figure, the same reference numerals denote the same or corresponding parts, which are common throughout the specification.

Embodiment.
FIG. 1 is a schematic diagram showing an example of the internal configuration of a hermetic compressor 100 according to an embodiment. FIG. 2 is a schematic cross-sectional view of the compression mechanism section 20 of the hermetic compressor 100 according to the embodiment. FIG. 3 is a cross-sectional view of the electric mechanism section 30 of the hermetic compressor 100 according to the embodiment. 3 is a cross-sectional view of the hermetic compressor 100 cut in a direction perpendicular to the axial direction of the crankshaft 40 at the electric mechanism portion 30. As shown in FIG.

The hermetic compressor 100 according to the embodiment is of a rotary type, and has the function of sucking fluid such as refrigerant, compressing it, and discharging it in a high-temperature, high-pressure state. As shown in FIG. 1, this hermetic compressor 100 includes a hermetic container 10 forming an outer shell. This sealed container 10 is composed of an upper container 11 and a lower container 12 .

A discharge pipe 102 is fixed through the upper surface of the upper container 11 of the closed container 10 . The discharge pipe 102 discharges high-pressure gas refrigerant to the outside of the sealed container 10 . The fixed portion between the discharge pipe 102 and the upper container 11 is joined by welding or the like, for example.

A suction muffler 101 for sucking low-pressure gas refrigerant from the refrigerant circuit is arranged on the side of the sealed container 10 . This suction muffler 101 is fixed to the side surface of the sealed container 10 by welding or the like.

A compression mechanism 20, an electric mechanism 30, a crankshaft 40, and other components are housed inside the sealed container 10. The electric mechanism section 30 is arranged above the compression mechanism section 20 . The crankshaft 40 is arranged between the electric mechanism section 30 and the compression mechanism section 20 in the central portion of the closed container 10 and extends vertically through the central portion of the closed container 10 .

The crankshaft 40 has a cylindrical eccentric shaft portion 42 arranged inside the compression mechanism portion 20 . A rolling piston 21 is attached to the outer peripheral surface of the eccentric shaft portion 42 so as to be rotatable along the outer peripheral surface of the eccentric shaft portion 42 . Further, in the crankshaft 40, an oil hole 44 (see FIG. 2) that supplies the refrigerating machine oil stored in the bottom of the lower container 12 of the closed container 10 to the compression mechanism 20 by centrifugal force due to the rotational motion of the crankshaft 40. is provided.

The compression mechanism section 20 compresses the low-pressure gas refrigerant sucked into the sealed container 10 into a high-pressure gas refrigerant by the rotational driving force supplied from the electric mechanism section 30, and converts the compressed high-pressure gas refrigerant into the compression mechanism. The ink is discharged upward from the portion 20 .

The compression mechanism section 20 includes a rolling piston 21, a cylinder 22, a vane 26, a main bearing 24, and a sub-bearing 25, as shown in FIGS. The cylinder 22 has a hollow cylindrical shape, and its outer peripheral surface is fixed to the inner peripheral surface of the lower container 12 of the closed container 10 . The hollow portion 22 a of the cylinder 22 accommodates the eccentric shaft portion 42 of the crankshaft 40 and the rolling piston 21 . That is, the cylinder 22 is configured such that the rotation of the crankshaft 40 causes the eccentric shaft portion 42 of the crankshaft 40 and the rolling piston 21 to rotate eccentrically in the hollow portion 22a.

The cylinder 22 is provided with a back pressure chamber 22b that communicates with the inside of the sealed container 10, and a vane groove 22c that communicates the hollow portion 22a and the back pressure chamber 22b. A vane 26 is accommodated in the vane groove 22 c of the cylinder 22 . The vane 26 is pressed against the surface of the rolling piston 21 by the restoring force of an elastic body such as a spring provided inside the vane groove 22c, and reciprocates inside the vane groove 22c by the eccentric motion of the rolling piston 21. It is a sliding member configured as follows.

A main bearing 24 that supports the main shaft portion 41 of the crankshaft 40 is arranged on the upper hollow disk surface of the cylinder 22 . A sub-bearing 25 that supports the sub-shaft portion 43 of the crankshaft 40 is arranged on the hollow disk surface on the lower side of the cylinder 22 . The main bearing 24 and the sub-bearing 25 slidably support the crankshaft 40 .

The main bearing 24 has a hollow disk shape when viewed from above. The main bearing 24 has a fixed portion (not shown) that is fixed to the upper hollow disk surface of the cylinder 22 and a bearing portion (not shown) that slidably supports the outer peripheral surface of the crankshaft 40 . doing. Further, the main bearing 24 is fixed to the upper hollow disk surface of the cylinder 22 by, for example, bolts or the like.

The sub-bearing 25 has a hollow disk shape when viewed from below. The sub-bearing 25 includes a fixed portion (not shown) fixed to the hollow disc surface on the lower side of the cylinder 22 and a bearing portion (not shown) slidably supporting the outer peripheral surface of the crankshaft 40. have. Further, the sub-bearing 25 is fixed to the lower hollow disk surface of the cylinder 22 by, for example, bolts.

In the compression mechanism portion 20, the sealable space surrounded by the rolling piston 21, the cylinder 22, the vane 26, the fixed portion of the main bearing 24, and the fixed portion of the sub-bearing 25 was sucked into the sealed container 10. It constitutes a compression chamber for compressing a low-pressure gas refrigerant. A high-pressure gas refrigerant compressed in the compression chamber is discharged from a discharge port (not shown) provided in the main bearing 24 .

Although the rotary type shown in FIGS. 1 and 2 has been described as an example of the configuration of the compression mechanism 20, it is not limited thereto, and may be of any type such as a scroll type or a reciprocating type. No. Also, the rolling piston 21 and the vane 26 are separate bodies and have been described as being in contact with each other, but they are not limited to this and may be integrated. Further, regarding the arrangement of the compression mechanism portion 20 and the electric mechanism portion 30 , the electric mechanism portion 30 may not necessarily be arranged above the compression mechanism portion 20 . That is, the arrangement of the compression mechanism section 20 and the electric mechanism section 30 may be upside down, or may be laterally arranged side by side. The configuration of these compression mechanism units 20 is an example, and the features of the present application are not limited to these configurations.

The configuration of the electric mechanism section 30 of the hermetic compressor 100 according to the embodiment will be described below with reference to FIGS. 1 and 3. FIG.

The electric mechanism section 30 is configured as a motor that generates rotational driving force using electric power supplied from an external power supply and transmits the rotational driving force to the compression mechanism section 20 via the crankshaft 40 . The electric mechanism section 30 includes a hollow cylindrical stator 32 and a hollow cylindrical rotor 31 rotatably arranged inside the inner peripheral surface of the stator 32 . The stator 32 is inserted into the closed container 10 of the closed compressor 100 and fixed to the inner peripheral surface of the closed container 10 by shrink fitting or the like. That is, the radial outer peripheral surface of the stator 32 and the inner peripheral surface of the sealed container 10 are in contact with each other and fixed. The rotor 31 is provided with a shaft hole 31b penetrating in the axial direction on the central axis of the rotor 31 . The main shaft portion 41 of the crankshaft 40 is inserted into the shaft hole 31 b of the rotor 31 , and the rotor 31 is fixed to the main shaft portion 41 of the crankshaft 40 .

The rotor 31 is composed of a rotor core 31 a in which thin electromagnetic steel plates are stacked in the axial direction of the crankshaft 40 . The electromagnetic steel sheets forming the rotor core 31a are formed by punching electromagnetic steel sheets into a predetermined shape, stacking multiple sheets in the axial direction of the crankshaft 40, and fixing the stacked electromagnetic steel sheets to each other by caulking or welding.

A magnet insertion hole 31c penetrating in the axial direction of the crankshaft 40 is provided in the rotor core 31a so as to surround the shaft hole 31b. A permanent magnet 33 made of a plate-shaped rare earth element is inserted and fixed in the magnet insertion hole 31c. An even number of magnet insertion holes 31c and permanent magnets 33 are generally provided, and are provided near the radial outer edge of the rotor core 31a, that is, the vicinity of the radial outer peripheral surface of the rotor core 31a. The rotor 31 generates magnetic flux with the permanent magnets 33 .

As shown in FIG. 1, an upper balance weight 34a is provided above the rotor core 31a, and a lower balance weight 34b is provided below the rotor core 31a. These upper balance weight 34a and lower balance weight 34b are provided to cancel the load when the eccentric shaft portion 42 of the crankshaft 40 rotates eccentrically. Furthermore, the upper balance weight 34a and the lower balance weight 34b also prevent the permanent magnets 33 from scattering. The upper balance weight 34 a , the lower balance weight 34 b and the rotor core 31 a are fixed by rivets 35 . Specifically, the upper balance weight 34a, the lower balance weight 34b, and the rotor core 31a are provided with rivet holes (not shown) penetrating in the axial direction of the crankshaft 40, and the rivet holes are provided with rivets. It is fixed by inserting 35. If the load generated when the eccentric shaft portion 42 of the crankshaft 40 rotates eccentrically is small and does not need to be counteracted, instead of the upper balance weight 34a and the lower balance weight 34b, the permanent magnet 33 can be provided with an edge that prevents scattering. A plate (not shown) may be provided.

Further, a communication hole (not shown) communicating with the crankshaft 40 in the axial direction is provided in the rotor core 31a. This communication hole is for allowing the refrigerant gas discharged from the compression mechanism portion 20 to pass therethrough. That is, the refrigerant gas discharged from the compression mechanism portion 20 passes through the communication hole and is delivered to the discharge pipe 102 . In addition to the communication hole, the air discharged from the compression mechanism section 20 also passes through the gap between the rotor 31 and the stator 32, the gap inside the stator 32, and the gap between the stator 32 and the sealed container 10. Refrigerant gas is delivered to the discharge pipe 102 .

As shown in FIG. 3, a rotor 31 is provided inside a hollow cylindrical stator 32, and the rotor 31 and the stator 32 are separated by a distance of about 0.3 mm to 1.0 mm. It is installed so as to have an air gap. The stator 32 includes a stator core 32a in which thin electromagnetic steel plates are stacked in the axial direction of the crankshaft 40, stator windings 37 wound around the stator core 32a, the stator core 32a and the stator windings. and an insulating member 38 (see FIG. 4 to be described later) that insulates from the wire 37 .

The stator core 32a is composed of a back yoke 32b that forms a cylindrical portion of the outer edge, and teeth 32c that are magnetic pole teeth provided inside the back yoke 32b. The teeth 32 c extend toward the central axis of the stator core 32 a , that is, toward the crankshaft 40 , and their tips widen in a reverse arc shape so as to face the outer peripheral surface of the rotor 31 . Slots 32d occupied by stator windings 37 are formed between adjacent teeth 32c.

The stator 32 according to the embodiment is formed by winding the stator winding 37 around each tooth 32c of the stator core 32a and then connecting the stator core 32a in an annular shape with the back yoke 32b. be. However, this is an example of the method of manufacturing the stator 32, and the feature of the present application is not limited to this method.

A stator winding 37 is wound around the tooth 32c via an insulating member 38 . A stator winding 37 is wound around the teeth 32c to form magnetic poles.

The stator winding 37 is composed of a core wire 37b (see FIGS. 6 and 7 described later), which is a conductor, and at least one layer of coating 37a (see FIGS. 6 and 7 described later) covering the core wire 37b. It is a conductor. The stator winding 37 is often a single wire, but a plurality of single wires may be used collectively. The material of the film is an insulating material such as AI (amide imide)/EI (ester imide). The stator 32 generates magnetic flux for each tooth 32c by applying current to the stator windings 37 . In addition, since the film has an insulating property, the conductors do not conduct even if they come into contact with each other.

As shown in FIG. 1, the upper container 11 of the closed container 10 is provided with a connection terminal 7 that is connected to a power supply provided outside the closed compressor 100, such as an inverter device. A lead wire 39 is provided in the upper part of the sealed container 10 . The lead wire 39 is a lead wire that supplies power to the stator windings 37 from a power source outside the sealed container 10 , and is a lead wire that connects the connection terminals 7 and the stator windings 37 . Then, the power source supplies power to the electric mechanism portion 30 through the connection terminal 7, and the electric mechanism portion 30 operates. That is, the stator 32 generates magnetic flux, and the rotor 31 rotates. Then, the compression mechanism section 20 is driven via the crankshaft 40 . Note that the connection terminals 7 may be provided in the lower container 12 instead of the upper container 11 of the closed container 10 .

FIG. 4 is an explanatory diagram showing the relationship between the restraining portion 51, the restraining groove 51a, the connecting wire 53, and the press contact terminal 52 in the hermetic compressor 100 according to the embodiment. FIG. 5 is an explanatory diagram showing how the stator winding 37 and the connecting wire 53 of the hermetic compressor 100 according to the embodiment are electrically connected to the lead wire 39. As shown in FIG. FIG. 6 is an explanatory view showing a state before the coated portion 37a of the stator winding 37 and the coated portion 53a of the connecting wire 53 of the hermetic compressor 100 according to the embodiment are peeled off. FIG. 7 shows that

core wires

37b and 53b, which are exposed by stripping the coated portion 37a of the stator winding 37 and the coated portion 53a of the connecting wire 53 of the hermetic compressor 100 according to the embodiment, are electrically connected to the pressure contact terminal 52. FIG. 4 is an explanatory diagram showing a connected state;

The insulating member 38 insulates the stator core 32 a mainly made of iron and the stator winding 37 . PET (polyethylene terephthalate), PBT (polybutylene terephthalate), LCP (liquid crystal polymer), PPS (polyphenylene sulfide), and the like are used as the material of the insulating member 38 .

As shown in FIG. 4, the insulating member 38 is provided with two restraining portions 51 for restraining and fixing the end portion, which is the terminal end of the stator winding 37 . When the insulating member 38 is attached to the stator core 32a, the restraining portion 51 is arranged on the axial end face of the crankshaft 40 of the back yoke 32b connected to the teeth 32c. Each of the restraining portions 51 includes a crimp terminal insertion portion 51b having four walls and an opening at the top for inserting the crimp terminal 52, and a restraint formed on a pair of opposing wall portions of the crimp terminal insertion portion 51b. A groove 51a is provided. One end portion of the stator winding 37 wound around the teeth 32c is restrained in the restraining groove 51a of one of the restraining portions 51. As shown in FIG. In the restraining groove 51a of the other restraining portion 51, the other end portion of the stator winding 37 wound around the teeth 32c is restrained. In this manner, the two end portions of the stator winding 37 wound around the tooth 32c are bound by the two binding portions 51, respectively. In addition to the stator winding 37 , the connecting wire 53 is also constrained in the constraining groove 51 a of the constraining portion 51 .

The pressure contact terminal 52 is to be inserted into the pressure contact terminal insertion portion 51b of the restraining portion 51 . The pressure contact terminal 52 is made of a conductive metal, such as brass, which is plated with tin. The insulation displacement terminal 52 is provided with a plurality of grooves 52a, and the structure is such that the grooves 52a sandwich the stator winding 37 and the connecting wire 53, respectively. As shown in FIG. 5, the pressure contact terminal 52 is inserted into the restraining portion 51, and the groove 52a (see FIG. 6) of the pressure contact terminal 52 sandwiches the stator winding 37 and the connecting wire 53, respectively, as indicated by arrows. The lead wire 39 is moved in the direction and attached to the crimp terminal 52 . By doing so, the pressure contact terminal 52 electrically connects the stator winding 37 , the connecting wire 53 and the lead wire 39 . That is, the stator winding 37 is connected to the crossover wire 53 via the restraint portion 51 and the press contact terminal 52 incorporated in the restraint portion 51 .

As shown in FIGS. 6 and 7, the core wire 37b is exposed from the coated portion 37a at the portion of the stator winding 37 sandwiched between the pressure contact terminals 52. As shown in FIGS. That is, around the portion of the stator winding 37 that is electrically connected to the press contact terminal 52, the coating portion 37a is peeled off, and the core wire 37b is exposed. Similarly, the core wire 53b is exposed from the covering portion 53a at the portion of the connecting wire 53 sandwiched between the pressure contact terminals 52. As shown in FIG. That is, around the portion of the connecting wire 53 electrically connected to the pressure contact terminal 52, the coating portion 53a is peeled off, and the core wire 53b is exposed.

When the pressure contact terminal 52 moves in the direction of the arrow in FIG. The coating portion 37a and the coating portion 53a of the connecting wire 53 are peeled off. The pressure contact terminal 52 and the core wire 37b of the stator winding 37 are electrically connected, and the pressure contact terminal 52 and the core wire 53b of the crossover wire 53 are electrically connected.

The crossover wire 53 is a conductive wire composed of a core wire 53b, which is a conductor, and at least one layer of coating 53a covering the core wire 53b, and connects the stator windings 37 wound around different teeth 32c. For example, a plurality of stator windings 37 are connected in series or in parallel, or end portions of a plurality of stator windings 37 are connected to form a neutral point.

One end of the lead wire 39 shown in FIG. 1 is bound by the binding portion 51 of the insulating member 38 . A terminal (not shown) is attached to the other end of the lead wire 39 , and this terminal is connected to the connection terminal 7 . The lead wire 39 is a conducting wire composed of a core wire that is a conductor and at least one layer of coating that covers the core wire.

Also, the connection terminal 7 electrically connects the inside and outside of the sealed container 10 . As a result, the stator winding 37 and the connecting wire 53 restrained by the restraining portion 51 of the insulating member 38 are connected to an external power source via the lead wire 39, the terminal, and the connection terminal 7, and are electrically connected. Let

FIG. 8 shows the reaction test results of metal catalysts in an R466A refrigerant environment, and shows changes in concentration in oil (concentration of iodine ions in refrigerating machine oil) with respect to temperature for each catalyst. The vertical axis of the graph in FIG. 8 indicates the concentration in oil, and the horizontal axis indicates the temperature. Here, the above reaction test results are obtained by heating PVE oil containing metal catalyst Al + Fe or Al + Fe + Cu and PVE oil containing no metal catalyst at 140 ° C. for 2 weeks in an R466A refrigerant environment. Each PVE oil was analyzed after completion to ascertain the remaining I ^- concentration.

As shown in FIG. 8, in comparison with the test results using aluminum (Al) and iron (Fe) as catalysts, the test results using copper (Cu), aluminum, and iron as catalysts showed that iodide ions in refrigerator oil The concentration increase rate is large. The reason for this is thought to be that the components contained in the R466A refrigerant and copper chemically reacted with each other, and iodide ions were generated in the refrigerating machine oil, since discoloration was observed in the copper catalyst after the test.

From the above test results, there is concern that copper may corrode due to chemical reactions in an R466A refrigerant environment where R466A refrigerant is used as the refrigerant to be compressed. Therefore, copper is not suitable as a material for the

core wires

37b, 53b of the stator winding 37 and the connecting wire 53, which are exposed by peeling off the

coating portions

37a, 53a by the pressure contact terminal 52. FIG. Further, copper is not suitable for the material of the core wire of the lead wire 39 whose core wire is exposed from the coating portion when connecting to the pressure contact terminal 52 with a terminal. Therefore, in the present application, the core wires of the stator windings 37, the connecting wires 53, and the lead wires 39 are made of aluminum.

FIG. 9 is a schematic configuration diagram of a refrigeration cycle device 200 including a hermetic compressor 100 according to the embodiment.

The refrigeration cycle device 200 includes a suction muffler 101 of the hermetic compressor 100 connected to the suction side of the hermetic compressor 100, and a refrigerant flow from the hermetic compressor 100 connected to the discharge side of the hermetic compressor 100. , an outdoor heat exchanger 104, a throttle device 105 such as an electric expansion, and an indoor heat exchanger 106 are connected by a refrigerant pipe 201 to form a refrigerant circuit in which the refrigerant circulates. . A nonflammable refrigerant containing iodine, such as R466A refrigerant, is used as the refrigerant circulating in the refrigerant circuit. The R466A refrigerant is a kind of mixed refrigerant containing trifluoroiodomethane (CF ₃ I). In general, in the refrigeration cycle device 200, the indoor heat exchanger 106 is an indoor device, and the remaining hermetic compressor 100, flow path switching valve 103, outdoor heat exchanger 104, and expansion device 105 are outdoors. installed in the device. It is assumed that the refrigeration cycle device 200 according to the embodiment is applied to an air conditioner capable of cooling and heating operations.

For example, in the heating operation of the refrigeration cycle device 200, the channel switching valve 103 is connected to the solid line side in FIG. The high-temperature, high-pressure refrigerant compressed by the hermetic compressor 100 flows into the indoor-side heat exchanger 106, where it is condensed and liquefied, and then throttled by the expansion device 105 into a low-temperature, low-pressure two-phase state. The low-temperature, low-pressure two-phase refrigerant flows to the outdoor heat exchanger 104 , evaporates, gasifies, and returns to the hermetic compressor 100 through the flow path switching valve 103 . That is, the refrigerant circulates as indicated by solid line arrows in FIG. Due to this circulation, the outdoor heat exchanger 104, which is an evaporator, exchanges heat with the outside air, and the refrigerant sent to the outdoor heat exchanger 104 absorbs heat. It is sent to the vessel 106 and exchanges heat with the air in the room to warm the air in the room.

Also, in the cooling operation of the refrigeration cycle device 200, the flow path switching valve 103 is connected to the dashed line side in FIG. The high-temperature, high-pressure refrigerant compressed by the hermetic compressor 100 flows to the outdoor heat exchanger 104, where it is condensed and liquefied, and then throttled by the expansion device 105 to become a low-temperature, low-pressure two-phase state. The low-temperature, low-pressure two-phase refrigerant flows to the indoor heat exchanger 106 , evaporates, gasifies, and returns to the hermetic compressor 100 through the flow path switching valve 103 . That is, when the heating operation changes to the cooling operation, the indoor heat exchanger 106 changes from a condenser to an evaporator, and the outdoor heat exchanger 104 changes from an evaporator to a condenser. Therefore, the coolant circulates as indicated by the dashed arrows in FIG. Due to this circulation, the indoor heat exchanger 106, which is an evaporator, exchanges heat with the indoor air, and absorbs heat from the indoor air, that is, cools the indoor air. 104, heat is exchanged with the outside air, and the heat is released to the outside air.

As described above, since the hermetic compressor 100 with improved efficiency is used in the refrigeration cycle device 200, the energy saving performance of the refrigeration cycle device 200 is improved.

As described above, the hermetic compressor 100 according to the embodiment includes the hollow cylindrical stator 32 having the stator core 32a and the stator windings 37 wound around the stator core 32a, and the stator 32 An electric mechanism section 30 having a rotor 31 rotatably provided inside; a compression mechanism section 20 driven by the electric mechanism section 30 to compress refrigerant; and a stator winding 37 having an aluminum core wire 37b.

According to the hermetic compressor 100 according to the embodiment, the core wire 37b of the stator winding 37 is made of aluminum instead of copper. Therefore, even when a nonflammable refrigerant containing iodine such as R466A refrigerant is used as the refrigerant circulating in the refrigerant circuit of the refrigeration cycle device 200 including the hermetic compressor 100, the core wire of the stator winding 37 The risk of corrosion of 37b can be reduced. As a result, the risk of poor conduction of the compressor can be reduced, and high reliability can be obtained.

Further, in the hermetic compressor 100 according to the embodiment, the stator 32 includes a connecting wire 53 that connects the stator windings 37 wound around different teeth 32c. The connecting wire 53 has an aluminum core wire 53b and an insulating coating 53a covering the core wire 53b. is not provided with the coating portion 53a, and the core wire 53b is exposed.

According to the hermetic compressor 100 according to the embodiment, the core wire 53b of the connecting wire 53 is made of aluminum. Therefore, even when a nonflammable refrigerant containing iodine such as R466A refrigerant is used as the refrigerant circulating in the refrigerant circuit of the refrigeration cycle device 200 including the hermetic compressor 100, the core wire 53b of the connecting wire 53 is The risk of corrosion can be reduced. As a result, the risk of poor conduction of the compressor can be reduced, and high reliability can be obtained.

Further, in the hermetic compressor 100 according to the embodiment, the lead wire 39 that connects the connection terminal 7 connected to the power supply outside the hermetic container 10 and the stator winding 37 is provided. The terminal portion of the lead wire 39 is fixed, and the lead wire 39 has an aluminum core wire and an insulating coating portion covering the core wire. is not provided, and the core wire is exposed.

According to the hermetic compressor 100 according to the embodiment, the core wire of the lead wire 39 is made of aluminum. Therefore, even when a nonflammable refrigerant containing iodine such as R466A refrigerant is used as the refrigerant circulating in the refrigerant circuit of the refrigeration cycle device 200 including the hermetic compressor 100, corrosion of the core wire of the lead wire 39 does not occur. can reduce the risk of As a result, the risk of poor conduction of the compressor can be reduced, and high reliability can be obtained.

Further, in the refrigeration cycle device 200 according to the embodiment, the hermetic compressor 100, the outdoor heat exchanger 104, the expansion device 105, and the indoor heat exchanger 106 are connected by a refrigerant pipe 201, and iodine is provided with a refrigerant circuit in which a nonflammable refrigerant containing is circulated.

According to the refrigeration cycle device 200 according to the embodiment, it is possible to obtain the same effect as the hermetic compressor 100 described above.

7 connection terminal, 10 airtight container, 11 upper container, 12 lower container, 20 compression mechanism, 21 rolling piston, 22 cylinder, 22a hollow part, 22b back pressure chamber, 22c vane groove, 24 main bearing, 25 sub-bearing, 26 Vane, 30 electric mechanism, 31 rotor, 31a rotor core, 31b shaft hole, 31c magnet insertion hole, 32 stator, 32a stator core, 32b back yoke, 32c teeth, 32d slot, 33 permanent magnet, 34a upper part balance weight, 34b lower balance weight, 35 rivet, 37 stator winding, 37a coating portion, 37b core wire, 38 insulating member, 39 lead wire, 40 crankshaft, 41 main shaft portion, 42 eccentric shaft portion, 43 sub shaft portion, 44 oil hole, 51 restraint portion, 51a restraint groove, 51b pressure contact terminal insertion portion, 52 pressure contact terminal, 52a groove, 53 connecting wire, 53a coating portion, 53b core wire, 100 sealed compressor, 101 suction muffler, 102 discharge pipe, 103 Flow path switching valve, 104 outdoor heat exchanger, 105 expansion device, 106 indoor heat exchanger, 200 refrigeration cycle device, 201 refrigerant piping.

Claims

a hollow cylindrical stator having a stator core and stator windings wound around the stator core; and an electric mechanism section having a rotor rotatably provided inside the stator;
a compression mechanism section driven by the electric mechanism section for compressing a nonflammable refrigerant containing iodine;
a closed container that houses the electric mechanism unit and the compression mechanism unit,
The stator winding has an aluminum core wire. The hermetic compressor.
The stator is
An insulating member that insulates the stator core and the stator winding,
The stator core has a back yoke that forms an outer edge, and teeth that are provided inside the back yoke and around which the stator winding is wound via the insulating member,
The insulating member is
2. The hermetic compressor according to claim 1, further comprising a restraining portion that fixes the end portion of the stator winding.
The restraining portion has an insulation displacement terminal insertion portion,
The insulating member is
an insulation displacement terminal inserted into the insulation displacement terminal insertion portion and electrically connected to the stator winding;
The stator winding is
Having an insulating coating that covers the core wire,
The hermetic compressor according to claim 2, wherein a portion of the core wire electrically connected to the pressure contact terminal is not provided with the coating portion, and the core wire is exposed.
The stator is
comprising a crossover wire that connects the stator windings wound around different teeth;
The restraint part fixes the terminal part of the connecting wire,
The crossover is
Having an aluminum core wire and an insulating coating covering the core wire,
The hermetic compressor according to claim 3, wherein a portion of the core wire electrically connected to the pressure contact terminal is not provided with the coating portion, and the core wire is exposed.
A lead wire that connects a connection terminal that connects to a power supply outside the closed container and the stator winding,
The restraint part fixes the terminal part of the lead wire,
The lead wire
Having an aluminum core wire and an insulating coating covering the core wire,
5. The hermetic compressor according to claim 3, wherein a portion of the core wire electrically connected to the press contact terminal is not provided with the coating portion, and the core wire is exposed.
The hermetic compressor, the outdoor heat exchanger, the throttle device, and the indoor heat exchanger according to any one of claims 1 to 5 are connected by refrigerant piping, and the nonflammable gas containing iodine A refrigeration cycle device equipped with a refrigerant circuit in which refrigerant circulates.