JP6914419B2 - Sealed electric compressor and refrigerating air conditioner using it - Google Patents

Description

The present invention relates to a closed electric compressor and a refrigerating and air-conditioning device using the same, and particularly a refrigerating cycle of a refrigerating and air-conditioning device (for example, an air conditioner, a refrigerator, a freezer, a refrigerator / freezing showcase, etc.) and a heat pump type hot water supply device. It is suitable as a closed electric compressor used as a constituent device of the above.

As the refrigerant used in refrigerators, air conditioners, refrigerators and the like, for example, R134a, R410A, R407C and the like are used. Although these refrigerants have little effect on the ozone layer, they have a large global warming potential (GWP). For example, R32 (difluoromethane) has been proposed as an alternative refrigerant. R32 has a global warming potential of about one-third that of R410A.

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

Japanese Unexamined Patent Publication No. 2011-94039 Japanese Unexamined Patent Publication No. 2011-52032

The HFO1234yf alone or a mixed refrigerant of this and HFC32 described in Patent Documents 1 and 2 can reduce GWP, but is slightly flammable. Further, HFO1234yf cannot exhibit the same ability as the refrigerant currently used as a refrigerant for an air conditioner. For this reason, there is a problem that it is difficult to adopt it because a large amount of refrigerant is used in a large air conditioner such as a multi air conditioner for buildings.

Further, when HFC32 is used as the refrigerant, in the closed electric compressor used in the refrigerating and air conditioner such as an air conditioner, the discharge temperature of the compressor becomes high, so that the inside of the closed electric compressor becomes high and further refrigerates. There is also a problem that the insulating film of the electric motor (motor) is hydrolyzed and deteriorates due to the presence of water contained in the cycle.

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

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

An object of the present invention is a closed electric compressor capable of suppressing hydrolysis and deterioration of the resin insulating material of an electric motor while using a refrigerant having a low global warming potential and a flame retardant property, and refrigeration using the same. To get an air conditioner.

In order to achieve the above object, the present invention is a high-pressure chamber type closed electric compressor including a compression mechanism unit for compressing a refrigerant and an electric motor for driving the compression mechanism unit in a closed container. It is provided with 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 global warming coefficient is low and the global warming coefficient is low as the refrigerant. It is characterized by using a flame-retardant and water-absorbent 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 the refrigerating air conditioner in which a closed electric compressor, an outdoor heat exchanger, an expansion valve, and an indoor heat exchanger are sequentially connected by a refrigerant pipe to form a refrigerating cycle. _{Trifluoroiodomethane (CF 3} I) alone or a mixed refrigerant containing the refrigerant is sealed as the refrigerant that circulates in the cycle, and the closed electric compressor is used as the closed electric compressor. It is a feature.

According to the present invention, a sealed electric compressor capable of suppressing hydrolysis and deterioration of the resin insulating material of the motor while using a refrigerant having a low global warming potential and a flame retardant, and refrigeration using the same. There is an effect that an air conditioner can be obtained.

It is a vertical sectional view which shows the whole structure of the closed type electric compressor which concerns on Example 1 of this invention. It is a partial cross-sectional plan view which shows the winding structure of the stator of the closed type electric compressor shown in FIG. It is a perspective view which shows the stator core of the motor shown in FIG. It is a developed view of the insulating film shown in FIG. It is sectional drawing in the circumferential direction of the teeth part of the stator core and the body part of an insulator. It is a developed view which shows another example of the insulating film shown in FIG. 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 can exhibit sufficient capacity as a refrigerant for a refrigerating air conditioner, uses a flame-retardant refrigerant having a low global warming potential (GWP), and suppresses hydrolysis and deterioration of the insulating film of a motor. In order to obtain a sealed electric compressor that can be used and a refrigerating and air-conditioning device using the same, the following configuration is used.

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

As the low GWP, flame-retardant, and water-absorbent refrigerant, non-flammable (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 to contain trifluoroiodomethane (CF 3} I) and difluoromethane (HFC32). In this case, in order to obtain appropriate GWP, nonflammability, and vapor pressure, _{it is preferable to contain 30 wt% or more of trifluoroiodomethane (CF 3} I), and 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 contain pentafluoroethane (HFC125), and the pentafluoroethane is preferably contained in the mixed refrigerant in an amount of 5 to 15 wt%.
It is preferable to use polyol ester (POE) oil or polyvinyl ether (PVE) oil as the refrigerating machine oil in the closed electric compressor because the compatibility with the trifluoroiodomethane and the above-mentioned HFC refrigerant is improved.

The stator of the motor includes a teeth portion around which a coil is wound and a slot provided between the teeth portions 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 teeth portion via the insulating film. As the insulating film, it is preferable to use polyethylene terephthalate having a elongation retention rate of 50% or more in an atmosphere of high-pressure steam at 140 ° C. for 7.5 hours or more.

In the conventional ones described in Patent Documents 1 and 2, it is described that HFO1234yf alone or a refrigerant obtained by mixing difluoromethane (HFC32) with the refrigerant is used as the refrigerant, and polyol estem oil is used as the refrigerating machine oil. .. Further, Patent Document 1 describes 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 for a stator in an electric motor, the moldability is deteriorated, and when the coil is wound, there is a problem that the coil surface is damaged at the end face of the film. Further, PPS and LCP are expensive materials, and there is a problem that the manufacturing cost is high. If a material such as polyethylene terephthalate (PET) or polyethylene naphthalate (PEN) is used for the insulating film of the stator, the compressor discharge temperature will be higher if a refrigerant mixed with HFC32 is used. Therefore, the temperature inside the closed container having a discharge gas atmosphere becomes high, and the moisture contained in the refrigeration cycle promotes hydrolysis of the insulating film and rapidly deteriorates.

Further, since HFO1234yf and HFC32 are slightly flammable refrigerants, there is a problem that it is difficult to adopt them in a large air conditioner such as a multi air conditioner for buildings where the amount of refrigerant is large. Further, when HFO1234yf is used alone as a refrigerant, there is a problem that sufficient capacity cannot be exhibited as a refrigerant for a refrigerating air conditioner such as a multi air conditioner for a building or a room air conditioner.

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

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

Further, in the present invention, since a material of polyethylene terephthalate or polyethylene naphthalate can be used for the insulating film which is a resin insulating material of the electric motor in the compressor, an inexpensive insulating film having good moldability (processability) can be used. There is also an effect.

By using a mixed refrigerant containing trifluoroiodomethane (CF ₃ I) and difluoromethane (HFC32) as the mixed refrigerant, it exhibits sufficient capacity as a refrigerant for refrigeration and air conditioning equipment such as large air conditioners. It is possible to obtain a highly efficient and highly reliable sealed electric compressor.

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

Further, by adopting the above-mentioned sealed electric compressor of the present invention in a refrigerating air conditioner, refrigeration with high reliability, high efficiency and stable performance while using a low GWP and flame-retardant refrigerant. An air conditioner can be obtained.

Hereinafter, specific examples of the closed electric compressor according to the present invention and the 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 examples, and various modifications and applications are included in the technical concept of the present invention. In each figure, the parts with the same reference numerals indicate the same or corresponding parts.

A case where the closed electric compressor according to the first embodiment of the present invention is applied to a high pressure chamber type closed 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 closed electric compressor according to the first embodiment, and the closed electric compressor of the present embodiment is a refrigerating cycle (refrigerant) constituting an air conditioner as a refrigerating air conditioner. It is used for the circuit). That is, in the air conditioner, a closed 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 this 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-absorbent refrigerant, and difluoromethane (HFC32). Is using. Further, as the closed electric compressor constituting the refrigeration cycle, a high pressure chamber type closed electric compressor (closed scroll compressor) described below is used.
[Overall configuration of sealed electric compressor]
As shown in FIG. 1, the closed electric compressor 50 of the first embodiment includes a closed container 1, a compression mechanism portion 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 top and bottom of the tubular portion 1a by welding, and the inside thereof is a high-pressure closed space. Further, the compression mechanism portion 2 and the electric motor 7 are housed in the closed container 1, and an oil sump portion 9 is formed at the bottom of the closed container 1.

The refrigerating machine oil (oil) 8 composed of ether-based or ester-based refrigerating machine oil or the like is stored in the oil sump portion 9. In this example, polyol ester (POE) oil or polyvinyl ether (PVE) oil is used as the refrigerating machine oil. The oil level of the refrigerating machine oil 8 is set to be located above the auxiliary bearing 15 that supports the lower part of the rotating shaft 6 that transmits the driving force of the electric motor 7 to the compression mechanism unit 2.

Reference numeral 11 denotes a suction pipe attached through the lid portion 1b of the closed container 1, and reference numeral 22 denotes a discharge pipe attached through the tubular 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 more than the outer peripheral surface of the end coil 17 in the motor 7. It is installed so that it protrudes to the center side and opens.

The compression mechanism unit 2 is installed in the upper part of the closed container 1 and sucks and compresses the gas refrigerant flowing through the refrigeration cycle and discharges it into the closed container 1. As the refrigerant, in this embodiment _{, a mixed refrigerant containing trifluoroiodomethane (CF 3} I) and difluoromethane (HFC32) is used.
The compression mechanism unit 2 includes a fixed scroll 3, a swivel scroll 4, a frame 5, and an old dam ring 10 as main components.

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

The swivel scroll 4 is configured by erecting a spiral wrap on an end plate, and the swirl scroll 4 is arranged so as to be sandwiched between the fixed scroll 3 and the frame 5, and is fixed. A compression chamber is formed by engaging the scroll 3 and the swirl scroll 4. A boss portion 4b in which the swivel bearing 4a is incorporated is provided on the back surface side (non-fixed scroll side) of the swivel scroll 4. An eccentric pin portion 6a of the rotating shaft 6 is fitted to the swivel bearing 4a in order to drive the swivel scroll 4 eccentrically.

The old dam ring 10 constitutes a rotation regulation mechanism of the turning scroll 4, and is installed between the turning scroll 4 and the frame 5 to prevent the turning scroll 4 from rotating and to prevent the turning scroll 4 from rotating in a circular orbit. It is for exercising.

The frame 5 is fixed to the closed container 1 by welding and supports the fixed scroll 3, the old dam ring 10, and the swivel scroll 4. A tubular portion 5a projecting downward is provided at the center of the frame 5. A main bearing 5b for supporting the rotating shaft 6 is provided in the tubular portion 5a.

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

The motor 7 has a rotor 7a integrally formed on the rotating shaft 6 by shrink fitting or the like, and a stator 7b fixed on the inner surface of the closed container 1 by shrink fitting or the like as main components, and the rotor 7a 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 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, respectively.

The stator 7b includes a stator 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 stator core 23 to pass an electric current to generate a rotating magnetic field. The coil (stator winding) 24 provided and the insulator 26 of a resin molded product provided at both ends of the iron core 23 in the axial direction and 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 in a concentrated winding system. Further, a large number of notches (not shown) in the axial direction are formed on the outer circumference of the stator 7b over the entire circumference, 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 rotational motion. The rotation 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 rotating shaft 6 is inserted into and fitted into the 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 to the compression mechanism portion 2, and the eccentric pin portion 6a formed at the end portion of the rotating shaft 6 is the compression mechanism portion. It is configured to engage with 2. 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 rotating shaft 6 extends from the rotor 7a to the oil sump 9 side at the bottom of the closed container 1. The rotating shaft 6 is supported by the main bearing 5b and the auxiliary 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 rotating 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 of the oil sump portion 9 is provided with the through hole. It is sucked up to the compression mechanism 2 side via 6b. The refrigerating machine oil 8 sucked up to the compression mechanism portion 2 side is supplied to the swivel bearing 4a and the main bearing 5b, and each sliding portion of the compression mechanism portion 2 (sliding portion of the old dam 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 to the discharge chamber 40 together with the refrigerant gas from the discharge port 14 provided in the central portion of the fixed scroll 3.

When the electric motor 7 is energized and the rotor 7a rotates, the rotating shaft 6 also rotates accordingly, and the eccentric pin portion 6a makes an eccentric rotational motion. As a result, the swivel scroll 4 is swiveled, and the compression chamber formed between the fixed scroll 3 and the swivel scroll 4 becomes smaller 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 unit 2, and the compressed refrigerant gas is discharged from the discharge port 14 at the center of the fixed scroll 3. Is discharged to the discharge chamber 40 at the upper part of the closed container 1. Reference numeral 34 is a lead wire, and 35 is a Herme terminal.
[Stator configuration]
Next, the structure of the stator 7b of the closed electric compressor shown in FIG. 1 will be described with reference to FIG.
The structure of the stator described here will be described as a 6-slot centralized winding motor. As shown in FIG. 2, the stator core 23 includes six teeth portions 28 extending in the axial direction of the motor, and a total of six slots 33 are formed between the teeth portions 28. An insulating film 32 as a resin insulating material is bent and inserted into each slot 33 as shown in FIG. 2, and a coil (stator winding) 24 is inserted into each slot 33 via the insulating film 32. It is wound directly around each of the parts 28. In this embodiment, the insulating film 32 uses a material of polyethylene terephthalate (PET) or polyethylene naphthalate (PEN).

In the stator wound by such a centralized winding method, windings (coils 24) having different phases (U phase, V phase, W phase) are wound around adjacent teeth portions 28, and are contained in one slot 33. There will be coils 24 with different phases. The coil (stator winding) 24 wound around the stator core 23 is connected to the lead wire 34, and the lead wire 34 is a herme terminal 35 provided in the closed container 1 of the closed electric compressor 50 (see FIG. 1). )It is connected to the.

The lead wire 34 is routed around the upper part of 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 motor 7 from the outside through the herme terminal 35 and the lead wire 34. Reference numeral 37 denotes an insulating material for the lead wire connecting portion.
[Structure of stator core and insulating film]
The configuration 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 motor 7 shown in FIG. As shown in FIG. 3, the stator core 23 is composed of a plurality of laminated steel plates, and protrudes inward in the radial direction from the annular portion 27 on the outer peripheral side and the inner peripheral surface of the annular portion 27 and in the circumferential direction. The teeth 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 and 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 teeth 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 the plurality of teeth portions 28. The so-called centralized winding method is adopted.

FIG. 4 is a developed view of the insulating film 32 shown in FIG. 2, in which 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 teeth portion 28 and arranged in the slot 33.
That is, the insulating film 32 is bent so as to match the shape of the slot 33 formed between the teeth portions 28 of the stator core 23 shown in FIG. 3 and inserted into the slot 33.

After inserting the insulating film 32 into the slot 33, the coil 24 is wound together with the teeth portion 28 and the insulator 26 (see FIG. 1) to obtain the state shown in FIG. FIG. 5 is a cross-sectional view of the teeth portion 28 of the stator core 23 and the body portion 30 of the insulator 26 in the circumferential direction.

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 this 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 the 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 developed view of FIG. 4, the insulating film 32 is an axial end portion (upper and lower end portions) 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 portions 32aa, and another film of the plurality of films, that is, a film 32b on the stator core 23 side is inserted and sandwiched in 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 ends in the axial direction of the stator core 23 (upper and lower ends in FIG. 5), and another film 32a on the stator core 23 side is folded back. The film 32b is sandwiched and fixed by 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 so as to match the shape of the slot 33 formed between the teeth portions 28 of the stator core 23 shown in FIG. 3 and inserted into the slot 33. After inserting the insulating film 32 into the slot 33, the coil 24 is wound together with the teeth portion 28 and the body portion 30 of the insulator 26 to obtain the state shown in FIG.

In this embodiment, the film 32a on the coil 24 side of the insulating film 32 is thicker than the film 32b on the stator core 23 side. Due to this difference in thickness, the formability of the vertically folded back portion 32aa of the film (insulating thin plate) 32a is improved, and the thinner film (insulating thin plate) 32b can easily follow the shape of the thicker film 32a. Can be done. 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 at the vertically folded portion 32aa of the film 32a in the vertical 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. As a result, it is possible to prevent the coil 24 from coming into contact with the edge portion, which is the end portion of the film 32b, and damaging the coil 24 when the coil is wound.

Further, in this embodiment, the insulating film 32 is composed of a plurality of films 32a and 32b, folded portions 32aa are provided at both ends in the axial direction of the film 32a on the coil side, and the other films 32b are fixed by the folded portions 32aa. It is configured to be. 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, since the stray capacitance of this portion can be reduced, there is also an effect that the leakage current can be reduced.

Further, in this embodiment, the coil-side film 32a constituting the insulating film 32 is folded back at both ends in the axial direction, and the other film 32b can be firmly sandwiched. Therefore, even under operating conditions such that the refrigerant in the refrigerant circuit returns to the inside of the compressor, the structure can be made so that the liquid refrigerant does not easily enter between the two films 32a and 32b. When a mixed refrigerant containing trifluoroiodomethane (CF ₃ I) and difluoromethane (HFC 32) is used, HFC 32 is a refrigerant having a high relative permittivity, but in this embodiment, the two films 32a and 32b Since the structure is such that it is difficult for the liquid refrigerant to enter between them, there is also an effect that the refrigerant flows between the coil 24 and the stator core 23 and the leakage current can be suppressed from increasing. That is, since the insulating film 32 having a relative permittivity lower than that of the mixed refrigerant and the refrigerating machine oil is arranged between the coil 24 and the stator core 23, the average value of the relative permittivity of the portion can be lowered. , Leakage current can be reduced.

In this embodiment, the insulating film 32 is composed of a plurality of films 32a and 32b, but the present invention is not limited to this configuration, and as shown in FIG. 6, the insulating film 32 is composed of one sheet. It may be composed of a film, 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 portions 32aa formed at both ends in the axial direction (both upper and lower ends) of the insulating film 32. The folded-back portion 32aa is located closer to the stator core 23 than the coil 24. Therefore, at both ends of the stator core 23 in the bearing direction, the insulating films 32 are arranged between the stator core 23 and the coil 24 in the radial direction in a folded and overlapped state.

The insulating film 32 shown in FIG. 6 is composed of one 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 located near the center. The distance can be double 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, the floating capacitance can be reduced, and the leakage current can be reduced. Can be reduced.

FIG. 7 is a refrigerating cycle configuration diagram of the refrigerating and air-conditioning apparatus according to the second embodiment of the present invention. An example is shown.

As shown in FIG. 7, the air conditioner as a refrigerating air conditioner is an oil separator provided in a closed electric compressor (compressor) 50 and a refrigerant pipe (refrigerant pipe) 51 on the discharge side from the compressor 50. 52, an oil return pipe 53 for returning the oil (refrigerant oil) accumulated in the oil separator 52 to the oil reservoir 9 (see FIG. 1) provided in the lower part of the closed container in the compressor 50, the refrigerant circulation direction. A four-way switching valve 54, an outdoor heat exchanger 56 equipped 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. The indoor heat exchanger 61 to which the 60 is attached, the suction side refrigerant pipe (refrigerant pipe) 62 of the compressor 50, and the accumulator 63 provided in the suction side refrigerant pipe 62 are sequentially connected by the refrigerant pipes 51 and 62. It constitutes a closed cycle refrigeration cycle.

As the refrigerant that circulates in the refrigeration cycle, trifluoroiodomethane (CF ₃ I) alone or a mixed refrigerant containing the refrigerant is used.
As the closed electric compressor 50, the closed electric compressor 50 of the above-mentioned Example 1 of the high pressure chamber type described with reference to FIGS. 1 to 6 is used. An electric motor 7 is installed inside the sealed electric compressor 50, an insulating film 32 shown in FIG. 4 or 6 is inserted into a stator core 23 (see FIG. 3) of the electric motor 7, and a coil is wound. Has been done.

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

With this configuration, the refrigerant has a low GWP and is flame-retardant. Therefore, even a refrigerating air conditioner that uses a large amount of refrigerant in a large air conditioner such as a multi air conditioner for buildings can cause a fire. Occurrence can be prevented. Further, since the refrigerant has water absorption, even if an inexpensive and highly processable material such as polyethylene terephthalate (PET) or polyethylene naphthalate (PEN) is used for the insulating film, the insulating film is hydrolyzed and deteriorated. This can be suppressed, the failure of the compressor can be avoided, and the performance of the refrigerating and air-conditioning apparatus can be stably maintained 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 are exemplified as other refrigerants. ..

That is, examples of other refrigerants include CO2, hydrocarbons, ethers, fluoroethers, fluoroalkenes, HFCs, HFOs, HClFOs, and HBrFOs. In addition, "HFC" indicates hydrofluorocarbon. "HFO" is a hydrofluoroolefin composed of a carbon atom, a fluorine atom, and a hydrogen atom, 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.

Examples of HFC include difluoromethane (HFC32), pentafluoroethane (HFC125), 1,1,2,2-tetrafluoroethane (HFC134), 1,1,1,2-tetrafluoroethane (HFC134a), and 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-pentafluoroethane (HFC365mfc) are exemplified.

Examples of fluoroalkenes include fluoroethane, fluoropropene, fluorobutene, chlorofluoroethane, chlorofluoropropene, and chlorofluorobutene. Fluoropropenes 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 (HFO 1345), and C ₄ H ₂ F ₆ (HFO 1336). The chlorofluorohydrocarbons _{ethene, C 2 F 3 Cl (CTFE} ) are exemplified. Examples of chlorofluoropropene include 2-chloro-3,3,3-trifluoro-1-propene (HCFO1233xf) and 1-chloro-3,3,3-trifluoro-1-propene (HCFO1233zd). ..

Trifluoroiodomethane, difluoromethane (HFC32), pentafluoroethane (HFC125), and hexafluoropropene as refrigerants to adjust global warming potential (GWP), vapor pressure, and flame retardant parameters. It is preferable to use one or more of (FO1216). In addition, in order to obtain a vapor pressure that matches the capacity of the equipment, the refrigerant includes HFO1234yf, HFO1234ze, 1,1,1,2-tetrafluoroethane (HFC134a), HFO1123, etc., and affects the vapor pressure and efficiency related to the capacity. It is preferable to adjust the degree of temperature gradient to be applied by the mixed concentration.

The blending amount of trifluoroiodomethane in the mixed refrigerant is 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 on a mass basis.

For the GWP, the value (100-year value) of the Intergovernmental Panel on Climate Change (IPCC) Fourth Assessment Report (AR4) is used. Further, as the GWP of the refrigerant not described in AR4, the value of the IPCC Fourth Assessment Report (AR5) may be used, or the value described in other publicly known documents may be used, or a known value may be used. Values calculated or measured using the method may be used. According to AR4, the GWP of trifluoroiodomethane is 0.4, the GWP of HFC32 is 675, and the GWP of HFC125 is 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. The flame retardant parameter of the refrigerant represented by the mathematical formula (1) is preferably 0.46 or less.

Fmix = Σi Fi xi ... (1)
Fmix indicates the flame retardancy parameter of the mixed refrigerant, Fi indicates the flame retardancy parameter of each refrigerant component, and xi indicates the mole fraction of each refrigerant component.

As the refrigerating machine 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 critical melting temperature on the low temperature side 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 oil represented by the chemical formulas (Chemical formula 1) and (Chemical formula 2), and polyvinyl ether oil represented by the chemical formula (Chemical formula 3). In the formulas (Chemical formula 1) and (Chemical formula 2), R ^{1 to} R ¹⁰ represent alkyl groups having 4 to 9 carbon atoms, which may be the same or different from each other. Further, in the formula (Chemical Formula 3), OR ¹¹ is a methyloxy group, an ethyloxy group, a propyloxy group or a butyloxy group, and n is 5 to 15.

The present invention is not limited to the above-described examples, and includes various modifications.
For example, in the above-described embodiment, an example in which a closed-type scroll compressor is adopted as the closed-type electric compressor has been described, but in addition to this, a closed-type rotary compressor, a swing-type or reciprocating-type compressor may be used. You may use it. Further, although the vertical type closed electric compressor has been described, the same applies to the horizontal type.

Further, the above-described embodiment has been described in detail in order to explain in an easy-to-understand manner in the present invention, and is not necessarily limited to the one including all the configurations described.

1: Sealed container, 1a: Cylinder part, 1b: Lid part, 1c: Bottom part, 2: Compression mechanism part, 3: Fixed scroll, 4: Swivel scroll, 4a: Swivel bearing, 4b: Boss part, 5: Frame, 5a : Cylinder part, 5b: Main bearing, 6: Rotating shaft, 6a: Eccentric pin part, 6b: Through hole, 7: Motor, 7a: Rotor, 7b: Stator, 8: Refrigerating machine oil, 9: Oil sump part, 10: Oldam ring, 11: Suction pipe, 12: Suction port, 14: Discharge port, 15: Secondary 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: Center hole, 24: Coil, 25: Rotor core, 26: Insulator, 27: Stator core annular part, 28: Teeth part, 30 : Insulator body, 32: Insulation film, 32a, 32b: Film, 32aa: Folded part, 33: Slot, 34: Lead wire, 35: Harme terminal, 36: Bundling member, 37: Insulation material for lead wire connection , 40: Discharge chamber, 41: Support member, 50: Sealed 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 : Refrigeration air conditioner (air conditioner).

Claims (7)

In a high-pressure chamber type closed electric compressor including a compression mechanism for compressing a refrigerant and an electric motor for driving the compression mechanism in a closed container.
The motor includes a stator and a rotor, and uses a material of polyethylene terephthalate (PET) or polyethylene naphthalate (PEN) as the resin insulating material used for the stator.
The refrigerant, trifluoroiodomethane _(CF 3 I) alone, or, Ri mixed refrigerant der containing the trifluoroiodomethane _(CF 3 I), and
The resin insulating material used for the stator is a sealed electric compressor characterized in that the elongation retention rate can be maintained at 50% in a high-pressure steam atmosphere at 140 ° C. for 7.5 hours or more. Machine. In the sealed electric compressor according to claim 1,
The sealed electric compressor, wherein the mixed refrigerant contains trifluoroiodomethane (CF ₃ I), difluoromethane (HFC32), and pentafluoroethane (HFC125). In the sealed electric compressor according to claim 2,
The mixed refrigerant is _{a closed electric compressor containing 30 to 50 wt% of trifluoroiodomethane (CF 3} I) and 40 to 60 wt% of difluoromethane (HFC32). In the sealed electric compressor according to claim 2.
The sealed electric compressor, wherein the mixed refrigerant _{contains 85 to 95 wt% of trifluoroiodomethane (CF 3} I) and difluoromethane (HFC32) in total. In the sealed electric compressor according to claim 1,
The sealed electric compressor is a closed electric compressor characterized in that polyol ester (POE) oil or polyvinyl ether (PVE) oil is used as the refrigerating machine oil. In the sealed electric compressor according to claim 1,
The stator of the motor includes a teeth portion around which a coil is wound and a slot provided between the teeth portions in which the coil is arranged, and an insulating film as a resin insulating material is inserted and arranged in the slot. A closed-type electric compressor, wherein the coil is wound around the teeth portion via the insulating film. In a refrigeration and air conditioner in which a closed 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.
As the refrigerant circulating in the refrigeration cycle, trifluoroiodomethane (CF ₃ I) alone or a _{mixed refrigerant containing the trifluoroiodomethane (CF 3} I) is sealed.
A refrigerating and air-conditioning apparatus characterized in that the sealed electric compressor according to claim 1 is used as the closed electric compressor.

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