JPWO2020031801A1 - Hermetic electric compressor and refrigerating and air-conditioning apparatus using the same - Google Patents

Abstract

The hermetic electric compressor is a high-pressure chamber type in which a hermetic container has a compression mechanism section for compressing a refrigerant and an electric motor driving the compression mechanism section. The electric motor includes a stator and a rotor, a polyethylene terephthalate (PET) or polyethylene naphthalate (PEN) material is used as a resin insulating material for the stator, and the refrigerant has a global warming potential. Use a low-flame retardant, water-absorbing refrigerant. As the refrigerant, for example, trifluoroiodomethane (CF3I) alone or a mixed refrigerant containing the refrigerant is used.

Description

The present invention relates to a hermetic electric compressor and a refrigerating and air-conditioning apparatus using the same, and in particular, a refrigerating cycle such as a refrigerating and air-conditioning apparatus (for example, an air conditioner, a refrigerator, a freezer, a refrigeration/freezing showcase), a heat pump type hot water supply apparatus, and the like. It is suitable as a hermetic electric compressor used as a component of the above.

As a refrigerant used for a refrigerator, an air conditioner, a refrigerator, etc., R134a, R410A, R407C, etc. are used, for example. Although these refrigerants have little influence on the ozone layer, they have a large global warming potential (GWP). As an alternative refrigerant to this, for example, R32 (difluoromethane) has been proposed. R32 has a global warming potential of about one-third of that of R410A.

However, although R32 has a low GWP of 650, further reduction of GWP is required. Therefore, as described in JP 2011-94039 A (Patent Document 1) and JP 2011-52032 A (Patent Document 2), 2,3,3,3-tetrafluoropropene (HFO1234yf) (GWP= 4) A simple substance or a mixed refrigerant of the above-mentioned refrigerant and R32 is proposed.

JP, 2011-94039, A JP, 2011-52032, A

The HFO1234yf simple substance described in Patent Documents 1 and 2 or a mixed refrigerant of HFO1234yf and HFC32 can reduce GWP, but is slightly flammable. Further, HFO1234yf cannot exhibit the same performance as the refrigerant currently used as a refrigerant for an air conditioner. Therefore, there is a problem that it is difficult to employ a large-scale air conditioner such as a multi-air conditioner for buildings, in particular, because a large amount of refrigerant is used.

Further, when HFC32 is used as the refrigerant, in a hermetic electric compressor used in a refrigerating and air-conditioning apparatus such as an air conditioner, the compressor discharge temperature becomes high, so the temperature inside the hermetic electric compressor becomes high, and further refrigeration occurs. There is also a problem that the insulating film of the electric motor (motor) is hydrolyzed and deteriorated due to the inclusion of water contained in the cycle.

In order to solve this problem, Patent Document 1 describes a compressor characterized by using a material of PPS (polyphenylene sulfide) or LCP (liquid crystal polymer) as a resin insulating material of a motor. Further, Patent Document 2 describes that the organic insulating material in the compressor uses a material that is not physically or chemically deteriorated.

However, since the material of PPS and LCP described in Patent Document 1 has high hardness, the insulating film of the electric motor has poor moldability, and when the coil is wound, the coil surface is damaged at the film end surface. There are challenges. Further, since PPS and LCP are expensive materials, there is a problem that the manufacturing cost becomes high.

An object of the present invention is to use a refrigerant having a low global warming potential and a flame retardant, while suppressing the resin insulating material of the electric motor from being hydrolyzed and deteriorated, and a refrigerator using the hermetic electric compressor. To get an air conditioner.

To achieve the above object, the present invention provides a high-pressure chamber type hermetic electric compressor including a compression mechanism section for compressing a refrigerant in a hermetic container, and an electric motor driving the compression mechanism section, wherein the electric motor is A stator and a rotor are provided, a material of polyethylene terephthalate (PET) or polyethylene naphthalate (PEN) is used as a resin insulating material used for the stator, and the refrigerant has a low global warming potential and It is characterized by using a flame-retardant and water-absorbing refrigerant, for example, trifluoroiodomethane (CF ₃ I) alone or a mixed refrigerant containing the trifluoroiodomethane (CF ₃ I).

Another feature of the present invention is a refrigerating and air-conditioning apparatus in which a hermetic electric compressor, an outdoor heat exchanger, an expansion valve, and an indoor heat exchanger are sequentially connected by a refrigerant pipe to form a refrigeration cycle. Trifluoroiodomethane (CF ₃ I) alone or a mixed refrigerant containing the refrigerant is sealed as a refrigerant circulating in the cycle, and the hermetic electric compressor is used as the hermetic electric compressor. Characterize.

ADVANTAGE OF THE INVENTION According to this invention, while using a flame retardant refrigerant with a low global warming potential, the hermetic electric compressor which can suppress that the resin insulation material of an electric motor is hydrolyzed and deteriorated, and the refrigeration using the same. There is an effect that an air conditioner can be obtained.

1 is a vertical cross-sectional view showing the overall configuration of a hermetic electric compressor according to a first embodiment of the present invention. It is a partial cross-sectional top view which shows the winding structure of the stator of the hermetic electric compressor shown in FIG. It is a perspective view which shows the stator core of the electric motor shown in FIG. FIG. 3 is a development view of the insulating film shown in FIG. 2. FIG. 4 is a cross-sectional view in the circumferential direction of the teeth portion of the stator core and the body portion of the insulator. FIG. 6 is a development view showing another example of the insulating film shown in FIG. 2. It is a refrigerating-cycle block diagram of the refrigerating air-conditioning apparatus which concerns on Example 2 of this invention.

INDUSTRIAL APPLICABILITY The present invention uses a flame retardant refrigerant that has a low global warming potential (GWP) and can exhibit sufficient ability as a refrigerant for a refrigerating and air-conditioning device, and suppresses deterioration of an insulating film of an electric motor due to hydrolysis. In order to obtain a possible hermetic electric compressor and a refrigerating and air-conditioning apparatus using the same, it has the following configuration.

That is, the present invention is a high-pressure chamber type hermetic electric compressor including a compression mechanism section for compressing a refrigerant and an electric motor for driving the compression mechanism section in a hermetic container, wherein the electric motor is a stator and a rotor. And a material of polyethylene terephthalate (PET) or polyethylene naphthalate (PEN) is used as the resin insulating material used for the stator, and the refrigerant has low GWP, flame retardancy, and water absorbency. It uses a certain refrigerant.

As the low GWP, flame-retardant, and water-absorbing refrigerant, non-combustible (flame-retardant) trifluoroiodomethane (CF ₃ I) is used alone, or a mixed refrigerant containing the refrigerant is used.
When the mixed refrigerant is used, it is preferable that trifluoroiodomethane (CF ₃ I) and difluoromethane (HFC32) are contained. In this case, in order to obtain appropriate GWP, incombustibility, and vapor pressure, it is preferable to contain 30 wt% or more of trifluoroiodomethane (CF ₃ I), and to contain 30 to 50 wt% of trifluoroiodomethane (CF ₃ I). Is more preferable. For the same reason, it is preferable that the mixed refrigerant contains 40 to 60 wt% of the difluoromethane (HFC32). For the same reason, the mixed refrigerant preferably contains 85 to 95 wt% of trifluoroiodomethane (CF ₃ I) and difluoromethane (HFC32) in total.

The mixed refrigerant may further include pentafluoroethane (HFC125), and it is preferable that the mixed refrigerant contains 5 to 15 wt% of pentafluoroethane.
In the hermetic electric compressor, when a polyol ester (POE) oil or a polyvinyl ether (PVE) oil is used as the refrigerating machine oil, compatibility with the trifluoroiodomethane and the HFC refrigerant described above is improved, which is preferable.

The stator of the electric motor includes a tooth portion around which a coil is wound, and a slot provided between the tooth portions and in which the coil is arranged, and an insulating film as a resin insulating material is inserted and arranged in the slot. The coil is wound around the tooth portion via the insulating film. For the insulating film, it is preferable to use polyethylene terephthalate, which can maintain the elongation retention rate at 50% in a high pressure steam atmosphere at 140° C. for 7.5 hours or more.

In the related art disclosed in Patent Documents 1 and 2, it is described that HFO1234yf alone is used as a refrigerant, or a refrigerant in which difluoromethane (HFC32) is mixed with the refrigerant is used, and a polyol ester system oil is used as a refrigerating machine oil. .. Further, Patent Document 1 discloses that PPS (polyphenylene sulfide) or LCP (liquid crystal polymer) is used as a resin insulating material used for a stator of an electric motor.

However, the materials of PPS and LCP have high hardness, and when used as an insulating film of a stator in an electric motor, formability deteriorates, and when a coil is wound, there is a problem that the coil surface is damaged at the film end surface. Furthermore, since PPS and LCP are expensive materials, there is a problem that the manufacturing cost becomes high. When a material such as polyethylene terephthalate (PET) or polyethylene naphthalate (PEN) is used for the insulating film of the stator, the compressor discharge temperature becomes higher when a refrigerant mixed with HFC32 is used. For this reason, the temperature in the closed container of the discharge gas atmosphere becomes high, and the moisture contained in the refrigeration cycle accelerates the hydrolysis of the insulating film to rapidly deteriorate it.

Further, since HFO1234yf and HFC32 are slightly flammable refrigerants, there is a problem that they are difficult to employ in large air conditioners such as multi air conditioners for buildings where the amount of refrigerant is large. Further, there is a problem in that the HFO1234yf alone used as a refrigerant cannot exhibit sufficient capacity as a refrigerant for a refrigerating and air-conditioning apparatus such as a multi-air conditioner for a building or a room air conditioner.

On the other hand, in the present invention, a low GWP, flame-retardant, and water-absorbing refrigerant such as trifluoroiodomethane (CF ₃ I) alone or a mixed refrigerant containing the refrigerant is used as the refrigerant. ing. Therefore, it is possible to obtain a hermetic electric compressor capable of suppressing the deterioration of the resin insulating material such as the insulating film of the electric motor which is hydrolyzed while using the low GWP and flame retardant refrigerant.

That is, trifluoroiodomethane has a high adiabatic index and a high compressor discharge temperature, but since it has water absorption, the refrigerant absorbs the water mixed in the refrigeration cycle and reduces the amount of water in the refrigeration cycle. You can When materials such as polyethylene terephthalate (PET) and polyethylene naphthalate (PEN) are used as resin insulating materials such as insulating films used in electric motors, these materials have hydrolyzability. However, since the water in the refrigeration cycle is absorbed by the refrigerant, the resin insulating material is less likely to hydrolyze even when the temperature of the compressor rises. As a result, it is possible to prevent or suppress hydrolysis and deterioration of the resin insulating material such as the insulating film of the electric motor, so that failure can be avoided and a highly reliable hermetic electric compressor can be obtained. ..

Further, in the present invention, since the material of polyethylene terephthalate or polyethylene naphthalate can be used for the insulating film which is the resin insulating material of the electric motor in the compressor, it is possible to use an insulating film which is inexpensive and has good moldability (workability). There is also an effect.

By using a mixed refrigerant containing trifluoroiodomethane (CF ₃ I) and difluoromethane (HFC32) as the mixed refrigerant, it exerts sufficient capacity as a refrigerant for a refrigerating and air-conditioning device such as a large air conditioner. It is possible to obtain a highly efficient and highly reliable hermetic electric compressor.

If polyol ester (POE) oil or polyvinyl ether (PVE) oil, which is a highly water-absorbent refrigerator oil, is used as the refrigerator oil, the amount of water in the refrigeration cycle can be further reduced. It is possible to further suppress the hydrolysis of the resin insulating material.

Further, by adopting the above-described hermetic electric compressor of the present invention in a refrigerating and air-conditioning apparatus, it is possible to use a refrigerant having a low GWP and a flame-retardant, while having a highly reliable, highly efficient and stable refrigeration. An air conditioner can be obtained.

Hereinafter, specific examples of a hermetic electric compressor according to the present invention and a refrigerating and air-conditioning apparatus using the same will be described with reference to the drawings. The present invention is not limited to the following embodiments, and various modifications and applications are included in the scope of the technical concept of the present invention. In addition, in each drawing, the parts given the same reference numerals indicate the same or corresponding parts.

A case where the hermetic electric compressor according to the first embodiment of the present invention is applied to a high pressure chamber type hermetic scroll compressor will be described with reference to FIGS. 1 to 6.
FIG. 1 is a vertical cross-sectional view showing the overall configuration of the hermetic electric compressor according to the first embodiment. The hermetic electric compressor according to the present embodiment is a refrigeration cycle (refrigerant) that constitutes an air conditioner as a refrigeration air conditioner. Circuit). That is, in the air conditioner, a hermetic electric compressor, an outdoor heat exchanger, a four-way switching valve, an expansion valve, and an indoor heat exchanger are sequentially connected by a refrigerant pipe to form a refrigeration cycle.

In the present embodiment, the refrigerant flowing through the refrigeration cycle is a mixed refrigerant containing trifluoroiodomethane (CF ₃ I), which is a low GWP, flame-retardant, and water-absorbing refrigerant, and difluoromethane (HFC32). Are using. As a hermetic electric compressor that constitutes the refrigeration cycle, a high-pressure chamber type hermetic electric compressor (hermetic scroll compressor) described below is used.
[Overall structure of hermetic electric compressor]
As shown in FIG. 1, the hermetic electric compressor 50 according to the first embodiment includes a hermetic container 1, a compression mechanism unit 2 and an electric motor 7 as main components.
The closed container 1 is composed of a cylindrical tubular portion 1a, a lid portion 1b and a bottom portion 1c attached to the upper and lower portions of the tubular portion 1a by welding, and the inside thereof is a high-pressure closed space. The compression mechanism 2 and the electric motor 7 are housed in the closed container 1, and an oil sump 9 is formed at the bottom of the closed container 1.

The oil sump 9 stores refrigerating machine oil (oil) 8 composed of ether-type or ester-type refrigerating machine oil or the like. In this embodiment, polyol ester (POE) oil or polyvinyl ether (PVE) oil is used as the refrigerator oil. The oil level of the refrigerating machine oil 8 is set to be located above a sub bearing 15 that supports a lower portion of the rotating shaft 6 that transmits the driving force of the electric motor 7 to the compression mechanism section 2.

Reference numeral 11 is a suction pipe that is attached through the lid portion 1b of the closed container 1, and 22 is a discharge pipe that is attached through the cylindrical portion 1a of the closed container 1. The discharge pipe 22 is arranged immediately below the compression mechanism portion 2 and is provided so as to project toward the center in the closed container 1, and the tip of the discharge pipe 22 is located more than the outer peripheral surface of the end coil 17 of the electric motor 7. It is installed so as to project to the center and open.

The compression mechanism section 2 is installed in the upper portion of the closed container 1, sucks and compresses the gas refrigerant flowing through the refrigeration cycle, and discharges it into the closed container 1. In this embodiment, a mixed refrigerant containing trifluoroiodomethane (CF ₃ I) and difluoromethane (HFC32) is used as the refrigerant.
The compression mechanism section 2 includes a fixed scroll 3, an orbiting scroll 4, a frame 5 and an Oldham ring 10 as main components.

The fixed scroll 3 is formed by vertically arranging a spiral wrap on an end plate, and is bolted onto the frame 5. A suction port 12 is provided in the peripheral portion of the fixed scroll 3, and a discharge port 14 is provided in the central portion. The suction port 12 communicates with the suction pipe 11, and the discharge port 14 communicates with a discharge chamber 40 above the compression mechanism section 2 in the closed container 1.

The orbiting scroll 4 is constructed by vertically arranging a spiral wrap on an end plate, and the orbiting scroll 4 is arranged so as to be sandwiched between the fixed scroll 3 and the frame 5 and fixed. A compression chamber is formed by engaging the scroll 3 and the orbiting scroll 4 with each other. On the back side (opposite side of the fixed scroll) of the orbiting scroll 4, a boss portion 4b in which an orbiting bearing 4a is incorporated is provided. An eccentric pin portion 6a of the rotary shaft 6 is fitted to the orbiting bearing 4a for eccentrically driving the orbiting scroll 4.

The Oldham ring 10 constitutes a rotation restricting mechanism of the orbiting scroll 4, and is installed between the orbiting scroll 4 and the frame 5 to prevent the orbiting scroll 4 from rotating and to form a circular orbit. It is for exercise.

The frame 5 is fixed to the closed container 1 by welding and supports the fixed scroll 3, the Oldham ring 10 and the orbiting scroll 4. At the center of the frame 5, a cylindrical portion 5a protruding downward is provided. A main bearing 5b for supporting the rotary shaft 6 is provided in the cylindrical portion 5a.

A plurality of discharge gas passages (not shown) that connect the upper space (discharge chamber 40) of the fixed scroll 3 and the lower space of the frame 5 are formed in the outer peripheral portions of the fixed scroll 3 and the frame 5.

The electric motor 7 has a rotor 7a integrally formed on the rotating shaft 6 by shrink fitting, and a stator 7b fixed to the inner surface of the closed container 1 by shrink fitting, as main constituent elements. A balance weight 16 is attached to the. That is, an upper balance weight (compression mechanism side balance weight) 16a is attached to the upper end surface of the rotor 7a, and a lower balance weight (anti-compression mechanism section side balance weight) 16b is attached to the lower end surface. The upper and lower balance weights 16a and 16b are fixed to the rotor 7a by a plurality of rivets.

The stator 7b includes a stator iron core (hereinafter, also simply referred to as an iron core) 23 for efficiently transmitting a rotating magnetic field, and a plurality of conductors wound around the iron core 23 and flowing a current to generate a rotating magnetic field. The coil (stator winding) 24 that is provided and an insulator 26 that is a resin molded product that is provided at both ends in the axial direction of the iron core 23 and is used for insulation between the coil 24 and the iron core 23 are the main constituent elements. The two insulators 26 provided at both ends of the iron core 23 in the axial direction are arranged so as to face each other with the iron core 23 interposed therebetween.

The coil 24 is wound around the iron core 23 by a concentrated winding method. A large number of axial notches (not shown) are formed on the outer circumference of the stator 7b, and a discharge gas passage is also formed between the notches and the closed container 1.

The rotor 7a has a rotor iron core (hereinafter, also simply referred to as an iron core) 25 and a permanent magnet built in the iron core 25 as main components, and converts a rotating magnetic field from the stator 7b into a rotating motion. The rotating shaft 6 is rotated. The rotor 7a is rotatably arranged in the central hole 23a (see FIG. 3) of the iron core 23 of the stator 7b.

The rotary shaft 6 is inserted and fitted into a central hole of the rotor 7a, and is integrated with the rotor 7a. Further, one end side (upper end side) of the rotating shaft 6 is extended from the rotor 7a toward the compression mechanism portion 2 side, and the eccentric pin portion 6a formed at the end portion of the rotating shaft 6 is connected to the compression mechanism portion. 2 is configured to engage. As a result, an eccentric force is applied to the eccentric pin portion 6a by the compression operation of the compression mechanism portion 2.

Further, the other end side (lower end side) of the rotary shaft 6 extends from the rotor 7a to the oil sump portion 9 side of the bottom portion of the closed container 1. The rotary shaft 6 is supported by the main bearing 5b and the sub bearing 15 on both sides of the rotor 7a, and is configured to be stably rotatable. The auxiliary bearing 15 is supported by a support member 41 fixed to the closed container 1 by welding and is immersed in the refrigerating machine oil 8.

The rotary shaft 6 is provided with a through hole 6b for supplying the refrigerating machine oil 8 at the bottom of the closed container 1 to each bearing portion and each sliding portion, and the refrigerating machine oil 8 in the oil reservoir 9 is provided with the through hole. It is sucked up to the side of the compression mechanism 2 via 6b. The refrigerating machine oil 8 sucked up to the side of the compression mechanism portion 2 is supplied to the orbiting bearing 4a and the main bearing 5b, and at the same time, the sliding portions of the compression mechanism portion 2 (the sliding portion of the Oldham ring 10 and both scrolls 3 , 4 sliding parts).
The refrigerating machine oil 8 supplied to the sliding portion of the compression mechanism portion 2 is discharged into the discharge chamber 40 from the discharge port 14 provided in the central portion of the fixed scroll 3 together with the refrigerant gas.

When the electric motor 7 is energized to rotate the rotor 7a, the rotary shaft 6 is also rotated accordingly, and the eccentric pin portion 6a makes an eccentric rotary motion. As a result, the orbiting scroll 4 is orbitally driven, and the compression chamber formed between the fixed scroll 3 and the orbiting scroll 4 is reduced while moving from the outer peripheral side to the central portion. As a result, the refrigerant gas sucked from the outside of the closed container 1 through the suction pipe 11 and the suction port 12 is compressed by the compression mechanism portion 2, and the compressed refrigerant gas is discharged from the discharge port 14 at the center of the fixed scroll 3. Is discharged into the discharge chamber 40 in the upper part of the closed container 1. In addition, 34 is a lead wire and 35 is a hermetic terminal.
[Stator configuration]
Next, the structure of the stator 7b of the hermetic electric compressor shown in FIG. 1 will be described with reference to FIG.
The structure of the stator described here is a six-slot concentrated winding motor. As shown in FIG. 2, the stator core 23 includes six teeth 28 extending in the electric motor axis direction, and a total of six slots 33 are formed between the teeth 28. An insulating film 32 as a resin insulating material is bent and inserted into each slot 33 as shown in FIG. 2, and the coil (stator winding) 24 is a tooth of the stator core 23 via the insulating film 32. It is wound directly on each part 28. In this embodiment, the insulating film 32 is made of polyethylene terephthalate (PET) or polyethylene naphthalate (PEN).

In the stator wound by such a concentrated winding method, windings (coils 24) having different phases (U phase, V phase, W phase) are wound around adjacent teeth portions 28, and inside one slot 33. Therefore, the coils 24 having different phases are present. A coil (stator winding) 24 wound around the stator core 23 is connected to a lead wire 34, and the lead wire 34 is a hermetic terminal 35 (see FIG. 1) provided in the closed casing 1 of the hermetic electric compressor 50. )It is connected to the.

The lead wire 34 is routed over the coil 24 and fixed to the coil 24 by a binding member 36 such as a racing thread. As a result, electric power can be supplied to the electric motor 7 from the outside through the hermetic terminal 35 and the lead wire 34. In addition, 37 is an insulating material for a lead wire connecting portion.
[Structure of stator core and insulating film]
The structure of the stator core 23 shown in FIGS. 1 and 2 will be described with reference to FIG.
FIG. 3 is a perspective view of the stator core (stator core) 23 of the electric motor 7 shown in FIG. As shown in FIG. 3, the stator core 23 is made up of a plurality of laminated steel plates, and has an annular portion 27 on the outer peripheral side and a radially inward projection from the inner peripheral surface of the annular portion 27, as well as the circumferential direction. The tooth portions 28 are arranged at equal intervals. Reference numeral 23a is a central hole of the stator core 23, and 33 is a slot provided between the teeth portions 28 in which the coil 24 (see FIGS. 1 and 2) is arranged. An insulating film 32 as a resin insulating material is inserted and arranged in the slot 33, and the coil 24 is wound around the tooth portion 28 via the insulating film 32.

The electric motor 7 is a so-called 4-pole 6-slot, and the coil 24 (see FIGS. 1 and 2) is wound around one tooth portion 28 in a concentrated manner without straddling a plurality of the tooth portions 28. The so-called concentrated winding method is used.

FIG. 4 is a developed view of the insulating film 32 shown in FIG. 2. The insulating film 32 is inserted into each slot 33 of the stator core 23 shown in FIG. 3, and the coil 24 is inserted through the insulating film 32. It is wound around the tooth portion 28 and arranged in the slot 33.
That is, the insulating film 32 is bent so as to fit the shape of the slot 33 formed between the teeth 28 of the stator core 23 shown in FIG.

After the insulating film 32 is inserted into the slot 33, the coil 24 is wound around the tooth portion 28 and the insulator 26 (see FIG. 1), so that the state shown in FIG. 5 is obtained. FIG. 5 is a sectional view in the circumferential direction of the teeth portion 28 of the stator core 23 and the body portion 30 of the insulator 26.

As shown in FIG. 5, the insulating film 32 shown in FIG. 4 is arranged in the gap between the teeth portion 28 of the stator core 23 and the coil 24. In the present embodiment, the insulating film 32 is composed of a plurality of films 32a, 32b, and the coil 24 is a tooth of the stator core 23 via the insulating film 32 composed of a plurality of films 32a, 32b. It is wrapped around the part 28. The insulating film 32 (films 32a, 32b) is made of polyethylene terephthalate (PET) or polyethylene naphthalate (PEN), and is a material that is inexpensive, has good workability, and has excellent heat resistance.

As shown in the development view of FIG. 4, the insulating film 32 has axial ends (upper and lower ends) of the film 32a on the coil 24 side among the films 32a and 32b composed of the plurality of insulating materials. A folded-back portion 32aa is formed in the upper and lower folded-back portions 32aa, and another film of the plurality of films, that is, the film 32b on the side of the stator core 23 is inserted and sandwiched between the folded-back portions 32aa.

Then, as shown in FIG. 5, the film 32a on the coil 24 side of the insulating film 32 is folded back at both axial ends (upper and lower ends in FIG. 5) of the stator core 23, and another film on the stator core 23 side is folded. The film 32b is fixed by sandwiching it between the upper and lower folded portions 32aa of the film 32a, and the insulating film 32 is arranged between the stator core 23 and the coil 24 in the radial direction. That is, the insulating film 32 shown in FIG. 4 is bent to fit the shape of the slot 33 formed between the teeth portions 28 of the stator core 23 shown in FIG. After the insulating film 32 is inserted into the slot 33, the coil 24 is wound around the tooth portion 28 and the body portion 30 of the insulator 26 to obtain the state shown in FIG.

In this embodiment, the coil 32 side film 32a of the insulating film 32 has a larger thickness than the stator core 23 side film 32b. This difference in thickness improves the moldability of the folded portions 32aa at the upper and lower sides of the film (insulating thin plate) 32a in the axial direction, and allows the thinner film (insulating thin plate) 32b to easily conform to the shape of the thicker film 32a. You can Therefore, the insulating film 32 can be easily inserted into the slot 33 of the stator core 23.

Further, since the other film 32b is fixed by the folded portions 32aa at the upper and lower sides of the film 32a in the axial direction, it is possible to prevent the film 32b from being displaced in the axial direction when the insulating film 32 is inserted into the slot 33. Accordingly, it is possible to prevent the coil 24 from coming into contact with the edge portion that is the end portion of the film 32b when the coil is wound and damaging the coil 24.

Further, in this embodiment, the insulating film 32 is composed of a plurality of films 32a and 32b, and the folded portions 32aa are provided at both axial ends of the film 32a on the coil side, and the folded portions 32aa fix the other film 32b. It is configured to do. As a result, the distance between the coil 24 and the stator core 23 can be increased by the thickness of the film 32b. Therefore, the stray capacitance of this portion can be reduced, which also has the effect of reducing the leakage current.

Further, in this embodiment, the coil side film 32a forming the insulating film 32 is folded back at both ends in the axial direction so that the other film 32b can be firmly sandwiched. Therefore, even under operating conditions in which the refrigerant in the refrigerant circuit returns to the interior of the compressor, it is possible to provide a structure in which the liquid refrigerant is unlikely to enter between the two films 32a and 32b. When a mixed refrigerant containing trifluoroiodomethane (CF ₃ I) and difluoromethane (HFC32) is used, HFC32 has a high relative dielectric constant, but in the present embodiment, the two films 32a and 32b are used. Since it is possible to make the structure in which the liquid refrigerant does not easily enter between them, there is also an effect that it is possible to suppress an increase in leakage current due to refrigerant flowing between the coil 24 and the stator core 23. That is, since the insulating film 32 having a lower relative permittivity than the mixed refrigerant and the refrigerating machine oil is disposed between the coil 24 and the stator core 23, the average value of the relative permittivity of that portion can be lowered. The leakage current can be reduced.

In addition, in the above-described embodiment, the insulating film 32 is described as being configured by a plurality of films 32a and 32b, but the present invention is not limited to this configuration, and as illustrated in FIG. 6, one insulating film 32 is provided. A film may be used, and a specific example thereof will be described below.

FIG. 6 shows another example of the insulating film 32 shown in FIG.

Similar to the film 32a shown in FIG. 4, the insulating film 32 shown in FIG. 6 has folded-back portions 32aa formed at both axial end portions (upper and lower end portions) of the insulating film 32. The folded-back portion 32aa is located closer to the stator core 23 than the coil 24 is. Therefore, at both ends of the stator core 23 in the bearing direction, the insulating films 32 are folded back and overlapped with each other, and are arranged between the stator core 23 and the coil 24 in the radial direction.

The insulating film 32 shown in FIG. 6 is composed of a single film, but since the coil 24 is supported by the folded-back portion 32aa of the insulating film 32, the coil 24 and the stator core 23 are also provided near the center. The distance can be twice the thickness of the insulating film 32. Therefore, even when the insulating film 32 shown in FIG. 6 is used, the insulating film 32 can be folded back to secure the distance between the coil 24 and the stator core 23, thereby reducing the stray capacitance and reducing the leakage current. It can be reduced.

FIG. 7 is a refrigeration cycle configuration diagram of a refrigeration air conditioner according to a second embodiment of the present invention, and a refrigeration air conditioner that employs the above-described hermetic electric compressor of the air conditioner as the refrigeration air conditioner. FIG.

As shown in FIG. 7, an air conditioner as a refrigerating and air-conditioning apparatus is a hermetic electric compressor (compressor) 50, and an oil separator provided in a discharge side refrigerant pipe (refrigerant pipe) 51 from the compressor 50. 52, an oil return pipe 53 for returning oil (refrigerating machine oil) accumulated in the oil separator 52 to an oil reservoir 9 (see FIG. 1) provided in the lower part of the hermetic container of the compressor 50, and a refrigerant circulation direction A four-way switching valve 54 for switching the air conditioner, an outdoor heat exchanger 56 provided with a blower 55, an electronic expansion valve (expansion valve) 57 for heating, a receiver 58, an electronic expansion valve (expansion valve) 59 for cooling, and a blower. An indoor heat exchanger 61 provided with 60, a suction side refrigerant pipe (refrigerant pipe) 62 of the compressor 50, and an accumulator 63 provided in the suction side refrigerant pipe 62 are sequentially connected by the refrigerant pipes 51 and 62. This constitutes a closed cycle refrigeration cycle.

As the refrigerant circulating in the refrigeration cycle, trifluoroiodomethane (CF ₃ I) alone or a mixed refrigerant containing the refrigerant is used.
As the hermetic electric compressor 50, the high pressure chamber type hermetic electric compressor 50 of the first embodiment described with reference to FIGS. 1 to 6 is used. The electric motor 7 is installed inside the hermetic electric compressor 50, the insulating film 32 shown in FIG. 4 or 6 is inserted into the stator core 23 (see FIG. 3) of the electric motor 7, and the coil is wound. Has been done.

That is, as shown in FIG. 3, the stator core 23 of the electric motor 7 includes a tooth portion 28 around which a coil is wound, and a slot 33 provided between the tooth portions and in which the coil is disposed. An insulating film 32 (see FIG. 4 and FIG. 6) as the resin insulating material is bent and inserted in the coil, and the coil is wound around the tooth portion via the insulating film 32. The insulating film 32 is made of polyethylene terephthalate (PET) or polyethylene naphthalate (PEN).

With such a configuration, the refrigerant is low GWP and flame-retardant. Therefore, even in a large-scale air conditioner such as a multi-air conditioner for buildings, even a refrigerating and air-conditioning apparatus that uses a large amount of refrigerant can cause a fire. Occurrence can be prevented. In addition, since the refrigerant has a water absorbing property, even if a material such as polyethylene terephthalate (PET) or polyethylene naphthalate (PEN) which is inexpensive and has good workability is used for the insulating film, the insulating film is hydrolyzed and deteriorated. Therefore, it is possible to prevent the occurrence of a malfunction, avoid a compressor failure, and stably maintain the performance of the refrigerating and air-conditioning apparatus for a long period of time.

In this embodiment, as the refrigerant, trifluoroiodomethane (CF ₃ I) alone or a mixed refrigerant containing trifluoroiodomethane and another refrigerant may be used, but the following refrigerants are exemplified. ..

That is, examples of other refrigerants include CO2, hydrocarbons, ethers, fluoroethers, fluoroalkenes, HFCs, HFOs, HClFOs, and HBrFOs. In addition, "HFC" shows hydrofluorocarbon. “HFO” is a hydrofluoroolefin composed of carbon atoms, fluorine atoms, and hydrogen atoms, and has at least one carbon-carbon double bond. "HClFO" consists of carbon, chlorine, fluorine, and hydrogen atoms and has at least one carbon-carbon double bond. "HBrFO" consists of carbon, bromine, fluorine, and hydrogen atoms and has at least one carbon-carbon double bond.

HFCs include difluoromethane (HFC32), pentafluoroethane (HFC125), 1,1,2,2-tetrafluoroethane (HFC134), 1,1,1,2-tetrafluoroethane (HFC134a), trifluoroethane. (HFC143a), difluoroethane (HFC152a), 1,1,1,2,3,3,3-heptafluoropropane (HFC227ea), 1,1,1,3,3,3-hexafluoropropane (HFC236fa), 1 , 1,1,3,3-pentafluoropropane (HFC245fa), and 1,1,1,3,3-pentafluorobutane (HFC365mfc).

Examples of the fluoroalkene include fluoroethene, fluoropropene, fluorobutene, chlorofluoroethene, chlorofluoropropene, and chlorofluorobutene. Examples of fluoropropene include 3,3,3-trifluoropropene (HFO1243zf), 1,3,3,3-tetrafluoropropene (HFO1234ze), 2,3,3,3-tetrafluoropropene (HFO1234yf), and HFO1225. Is exemplified. Examples of fluorobutene include C ₄ H ₄ F ₄ , C ₄ H ₃ F ₅ (HFO1345), and C ₄ H ₂ F ₆ (HFO1336). Examples of chlorofluoroethene include C ₂ F ₃ Cl(CTFE). Examples of chlorofluoropropene include 2-chloro-3,3,3-trifluoro-1-propene (HCFO1233xf) and 1-chloro-3,3,3-trifluoro-1-propene (HCFO1233zd). ..

As a refrigerant, trifluoroiodomethane, difluoromethane (HFC32), pentafluoroethane (HFC125), and hexafluoropropene are used to adjust the Global Warming Potential (GWP), vapor pressure, and flame retardant parameters. It is preferable to use at least one of (FO1216). In addition, in order to obtain a vapor pressure suitable for the capacity of the equipment, the refrigerant includes HFO1234yf, HFO1234ze, 1,1,1,2-tetrafluoroethane (HFC134a), HFO1123, etc., and influences the vapor pressure and efficiency related to the capacity. It is preferable to adjust the degree of temperature gradient to be applied by adjusting the mixture concentration.

The content of trifluoroiodomethane in the mixed refrigerant is, on a mass basis, 10% or more and 100% or less, preferably 20% or more and 80% or less, and more preferably 30% or more and 50% or less.

For the GWP, the value (100-year value) of the Intergovernmental Panel on Climate Change (IPCC) Fourth Assessment Report (AR4) is used. As the GWP of the refrigerant not described in AR4, the value of the IPCC Fifth Assessment Report (AR5) may be used, or the value described in other known documents may be used, or the known value The value calculated or measured using the method may be used. According to AR4, trifluoroiodomethane has a GWP of 0.4, HFC32 has a GWP of 675, and HFC125 has a GWP of 3,500.

The GWP of the refrigerant is 750 or less, preferably 500 or less, more preferably 150 or less, still more preferably 100 or less, and particularly preferably 75 or less.

The vapor pressure of the refrigerant at 25° C. is preferably in the range of 1.4 MPa to 1.8 MPa. Further, the flame retardant parameter of the refrigerant represented by the mathematical formula (1) is preferably 0.46 or less.

Fmix=ΣiFixi (1)
It should be noted that Fmix is a flame retardant parameter of the mixed refrigerant, Fi is a flame retardant parameter of each refrigerant component, and xi is a mole fraction of each refrigerant component.

As the refrigerator oil, a polyol ester oil or a polyvinyl ether oil having a kinematic viscosity at 40° C. of 30 to 100 mm ² /s is preferable. The kinematic viscosity is measured based on standards such as ISO (International Organization for Standardization) 3104, ASTM (American Society for Testing and Materials) D445, D7042. The low temperature side critical melting temperature of the refrigerant and the refrigerating machine oil is preferably +10°C or lower.

Examples of the refrigerating machine oil having the above characteristics include polyol ester oils represented by the chemical formulas (Chemical formula 1) and (Chemical formula 2), and polyvinyl ether oils represented by the chemical formula (Chemical formula 3). In formulas (Formula 1) and (Formula 2), R ^{1 to} R ¹⁰ represent an alkyl group having 4 to 9 carbon atoms, and may be the same or different. Further, in the formula (Formula 3), OR ¹¹ is a methyloxy group, an ethyloxy group, a propyloxy group or a butyloxy group, and n is 5 to 15.

It should be noted that the present invention is not limited to the above-described embodiments, but includes various modifications.
For example, in the above-described present embodiment, an example in which a hermetic scroll compressor is adopted as the hermetic electric compressor has been described. However, in addition to this, a hermetic rotary compressor, a swing type compressor, or a reciprocating compressor is used. You may use it. Further, although the vertical hermetic electric compressor has been described, it can be similarly applied to a horizontal hermetic compressor.

Further, the above-described embodiments have been described in detail for the sake of easy understanding in the present invention, and are not necessarily limited to those having all the configurations described.

1: closed container, 1a: cylinder part, 1b: lid part, 1c: bottom part, 2: compression mechanism part, 3: fixed scroll, 4: orbiting scroll, 4a: orbiting bearing, 4b: boss part, 5: frame, 5a : Cylindrical portion, 5b: main bearing, 6: rotating shaft, 6a: eccentric pin portion, 6b: through hole, 7: electric motor, 7a: rotor, 7b: stator, 8: refrigerating machine oil, 9: oil sump portion, 10: Oldham ring, 11: suction pipe, 12: suction port, 14: discharge port, 15: auxiliary bearing, 16: balance weight, 16a: upper balance weight, 16b: lower balance weight, 17: end coil, 18a, 18b. : Discharge gas passage, 22: discharge pipe, 23: stator core, 23a: central hole, 24: coil, 25: rotor core, 26: insulator, 27: stator core annular part, 28: teeth part, 30 : Insulator body, 32: Insulating film, 32a, 32b: Film, 32aa: Folding part, 33: Slot, 34: Lead wire, 35: Herme terminal, 36: Bundling member, 37: Insulating material for lead wire connecting part , 40: discharge chamber, 41: support member, 50: hermetic electric compressor (compressor), 51: discharge side refrigerant pipe, 52: oil separator, 53: oil return pipe, 54: four-way switching valve, 55: Blower, 56: outdoor heat exchanger, 57, 59: electronic expansion valve (expansion valve), 58: receiver, 60: blower, 61: indoor heat exchanger, 62: suction side refrigerant pipe, 63: accumulator, 100 : Refrigerating air conditioner (air conditioner).

Claims (8)

In a hermetic container, a high-pressure chamber type hermetic electric compressor including a compression mechanism section for compressing a refrigerant and an electric motor for driving the compression mechanism section,
The electric motor includes a stator and a rotor, and a polyethylene terephthalate (PET) or polyethylene naphthalate (PEN) material is used as a resin insulating material used for the stator.
The hermetically sealed electric compressor, wherein the refrigerant is trifluoroiodomethane (CF ₃ I) alone or a mixed refrigerant containing the trifluoroiodomethane (CF ₃ I). In the hermetic electric compressor according to claim 1,
The hermetic electric compressor is characterized in that the mixed refrigerant contains trifluoroiodomethane (CF ₃ I), difluoromethane (HFC32), and pentafluoroethane (HFC125). In the hermetic electric compressor according to claim 2,
The hermetic electric compressor is characterized in that the mixed refrigerant contains 30 to 50 wt% of trifluoroiodomethane (CF ₃ I) and 40 to 60 wt% of difluoromethane (HFC32). The hermetic electric compressor according to claim 2,
The hermetic electric compressor is characterized in that the mixed refrigerant contains 85 to 95 wt% of trifluoroiodomethane (CF ₃ I) and difluoromethane (HFC32) in total. The hermetic electric compressor according to claim 1,
The hermetic electric compressor uses polyol ester (POE) oil or polyvinyl ether (PVE) oil as refrigerating machine oil. The hermetic electric compressor according to claim 1,
The stator of the electric motor includes a tooth portion around which a coil is wound, and a slot provided between the tooth portions and in which the coil is arranged. An insulating film as the resin insulating material is inserted and arranged in the slot. The coil is wound around the teeth portion with the insulating film interposed therebetween. The hermetic electric compressor according to claim 6,
The insulating film is made of polyethylene terephthalate (PET), which can maintain the elongation retention at 50% in a high pressure steam atmosphere at 140° C. for 7.5 hours or more. Hermetic electric compressor. In a refrigerating air-conditioning apparatus that constitutes a refrigerating cycle in which a hermetically sealed electric compressor, an outdoor heat exchanger, an expansion valve, and an indoor heat exchanger are sequentially connected by a refrigerant pipe,
Trifluoroiodomethane (CF ₃ I) alone or a mixed refrigerant containing the trifluoroiodomethane (CF ₃ I) is enclosed as a refrigerant circulating in the refrigeration cycle,
A refrigerating and air-conditioning apparatus, wherein the hermetic electric compressor according to claim 1 is used as the hermetic electric compressor.

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