JP3357607B2 - Rotary electric machine combined with ammonia rotary machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotating electric machine coupled to a rotating machine for compressing and expanding an ammonia refrigerant, and more particularly, to a compressor or an expansion machine for cooling using ammonia as a refrigerant. The present invention relates to a rotating electric machine serving as a motor or a generator that is integrally connected to a rotating machine that performs an operation and that constitutes a hermetic rotating device.

[0002]

2. Description of the Related Art CFCs have been used as refrigerants in cooling systems because they are harmless to humans, have excellent insulation properties, and have stable properties that do not easily decompose. Since its use causes destruction of the earth's ozone layer and global warming, its use has been restricted, and the use of conventionally used ammonia has been reviewed again.

[0003] Ammonia is flammable and toxic and is highly corrosive, and copper wires and existing organic insulating materials are not usable because they are attacked by ammonia. Therefore, in a rotating electric machine that forms a rotating device by being connected to a rotating machine for ammonia refrigerant, the rotating machine and the rotating shaft of the rotating electrical machine are used by being coupled with a coupling. A mechanical shaft sealing device is used to prevent the refrigerant from leaking between the rotating shaft and the body and to shut off the outside air. However, completely preventing the leakage of ammonia,
It was difficult to shut off the outside air.

Therefore, when using a CFC-based refrigerant, a so-called hermetic type rotating electric machine having a hermetic structure in which a rotating machine and a rotating electric machine are housed in a pressure-resistant sealed casing has been put to practical use. It is conceivable to use a simple hermetic rotating electric machine.

Further, in a rotating electric machine, a thin metal plate cylindrical can is inserted into a gap between the stator and the rotor to isolate the rotor from the stator, and refrigerant enters the stator. A so-called canned motor that prevents the above has been put to practical use.

[0006]

However, in the above-described hermetic-type rotating electric machine, ammonia is flammable and toxic as described above, and is highly corrosive, and copper wire and existing organic insulating materials are converted to ammonia. Invaded and unbearable for use. In addition, according to the above-described canned motor, the efficiency is lower and the temperature rise is larger than that of a general-purpose machine due to a can loss generated in the can.

Further, when the rotating electric machine is used as a generator for power recovery using an expander or the like, it is difficult to form a candid like a motor due to the structure of a field rotor or the like, and a completely sealed rotating electric machine is used. Was difficult to put into practical use.

SUMMARY OF THE INVENTION An object of the present invention is to solve such a conventional problem, and is directed to a rotating electric machine constituting a hermetic type rotating device having a hermetically sealed structure integrated with a rotating machine. An object of the present invention is to provide a rotating electric machine that can be continuously operated for a long period of time by using high-purity aluminum and using a coating material that is chemically stable with respect to ammonia.

Still another object of the present invention is to provide a rotating electric machine which can be operated continuously for a long period of time by using a chemically stable fluororesin as an insulating material for electric components.

[0010]

SUMMARY OF THE INVENTION The present invention is a rotating electric machine coupled to a rotating machine for ammonia, and is configured as follows to solve the above-mentioned technical problem. That is, in a rotating electric machine that is integrally connected to a rotating machine that compresses or expands the refrigerant ammonia and that is housed in a pressure-resistant sealed casing and that constitutes a hermetic rotating device having an airtight structure, the winding of the rotating electric machine has a purity. Is 99.
6% or more of aluminum intermediate softening material or soft material
Aluminum wire directly coated with fluorine resin
The aluminum intermediate softening material
Wire obtained by drawing high purity aluminum ingot
After drawing the aluminum hard material, the first annealing is performed.
It is an electric wire obtained by drawing again, and the soft material is
A wire obtained by further performing a second annealing with a softener.
Characterized in that that. In this case, from the intermediate softening material
The wire before annealing becomes hard material and intermediate softening before the annealing.
The wire obtained by further performing the second annealing on the material is a soft material.
The elongation of the intermediate softened material is greater than that of the soft material
And a value close to that of a hard material.
Twice and higher torsion value than hard and soft materials
It is an electric wire that is a numerical value.

In the present invention, the rotary machine acts as a compressor or an expander as described above, and a rotary machine having an appropriate structure such as a screw type, a turbo type, a rotary type, and a reciprocating type may be used. Can be.

The hard copper wire for electrical use widely used for wound conductors is easily attacked by ammonia. Therefore, in the present invention, an aluminum wire having good corrosion resistance is used.
A high-purity aluminum wire having a purity of 99.6% or more in terms of electrical conductivity, tensile strength, twist value, and bending value was used.
The electrical insulating material directly covering the aluminum wire is a fluorine resin which is not affected by ammonia or hydraulic oil of a rotating machine and has excellent mechanical properties even at extremely low temperatures. Fluororesin also has the effect of increasing the flexibility of the conductive wire, has a very small coefficient of friction, is extremely excellent in electrical properties, and has good insulation properties.

Further, the fluororesin has excellent heat resistance (for example, -250 to 260 ° C. for tetrafluoroethylene), and particularly has excellent mechanical properties even at extremely low temperatures. Also, the coefficient of friction is very small. Further, the fluororesin has extremely excellent electrical properties and good insulating properties. Moreover, from very low temperature to 20
Maintains electrical properties over a wide temperature range up to 0 ° C. Furthermore, it has excellent chemical properties and is chemically inert to many industrial chemicals and solvents, not only at ordinary temperature but also at high temperature and high pressure. Therefore, it is most suitable as an insulating member for a motor in an ammonia refrigerant and a bearing for a rotating shaft of a motor requiring continuous rotation.

A crosslinked polyethylene-coated wire is an example of an ammonia-resistant wire, and a crosslinked polyethylene-coated wire is superior to a fluorine resin-coated wire at room temperature in terms of gas permeability coefficient showing ammonia resistance. As a wound wire, when rising due to heat generation, the gas permeability coefficient of the fluororesin-coated wire is smaller and the melting point of the resin is higher, so the fluororesin is used as the electrical insulating material in the present invention. .

Further, in the present invention, a groove insulating sheet in a wire groove for accommodating the winding made of the aluminum wire, a wedge of a wire presser, and a terminal connected to the wire and passing through a pressure-resistant sealed casing. insulating portion, at least one insulating material for electric parts such bondage means for pressing the vibration of Senwa mutual that is formed by fluorine resin insulating material. Specifically, c
-The rotating electric machine that composes the
Cylinder type pressure-resistant sealed casing
The stator fitted and fixed to the inner peripheral surface of the
After applying a base resin and laminating to the desired thickness,
The stator according to claim 1, wherein the stator has a core.
To form a stator wire loop.
The ends of the strands are projected axially from both sides of the stator core.
Penetrating stud connected to the end of the wire loop
Airtightly sealed with a pressure-resistant sealed casing with fluorine resin
It is configured to be insulated.

Furthermore, Te present invention smell, the intermediate softener
An electric wire consisting of a hard material, an intermediate
The softened material is further subjected to a second annealing to soften the wire obtained.
When the softened material is used, the elongation of the intermediate softened material is higher than that of the soft material.
The value is significantly smaller and close to that of the hard material.
Approximately twice and twist value is higher than hard and soft materials
An electric wire with a high number is good. The desired bending value can be obtained by annealing high-purity aluminum at an appropriate temperature and for an appropriate time.However, regarding the flexibility of the bare wire of the intermediate softening material and the flexibility of the fluorine resin-coated wire, the fluorine resin-coated wire is bare. There are test results that show three times the flexibility of the line.

According to the rotary electric machine coupled to the rotary machine for ammonia of the present invention, the rotary electric machine is housed in the pressure-resistant sealed casing and connected to the compressor as the rotary machine to form a hermetic rotary device. The rotating electric machine is operated in a state filled with ammonia and completely shut off from the atmosphere. At this time, since the aluminum winding of the rotating electric machine is covered with the fluorine resin, stable continuous operation is performed for a long time without contaminating the ammonia of the refrigerant and without being affected by the ammonia.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will now be described in detail with reference to the drawings. However, the dimensions, materials, shapes, and other relative arrangements of the components described in this embodiment are not intended to limit the scope of the present invention unless otherwise specified, and are merely illustrative examples. Only.

FIG. 1 shows a schematic cross section of a compression device which is a hermetic type rotary device according to an embodiment of the present invention, and FIG. 2 shows a developed cross section of a stator and a rotor of a motor which is a rotary electric machine.

First, in FIG. 1, a hermetic type rotary device A comprises a screw type compressor 1 as a rotary machine and a hermetic type motor 2 as a rotary electric machine integrally connected to the rotary machine. The screw type compressor 1 has a pair of male and female screw rolls 15a having different cross sections,
15b are engaged with each other in a cylindrical cylinder 16 so as to be rotatable with each other.

A suction port 18 and a discharge port 19 are formed in the cylinder 16. Ammonia gas, which is a refrigerant vapor sucked between the pair of screws 15 a and 15 b and the wall of the cylinder 16 via the suction port 18, is provided. Screw 15
The pressure of the refrigerant is increased by compressing the volume of the refrigerant by rotation with a and 15b, and the refrigerant is sent from the discharge port 19 to a condenser (not shown).

In the hermetic type motor 2, a stator 3 is fitted and fixed to the inner peripheral surface of a cylindrical pressure-resistant sealed casing 8, and the rotor 3 is provided with a small gap with respect to the inner diameter of the stator 3. 4 are arranged. The rotating shaft 20 mounted through the center of the rotor 4 is rotatably supported by bearings 21 in the pressure-resistant sealed casing 8. Further, in the hermetic type motor 2, the insulating material of all the electric components is formed of a fluorine resin. Although not shown, a side face of the pressure-resistant sealed casing 8 is provided with a suction port and a discharge port for the refrigerant.

The rotating shaft 20 of the rotor 4 is connected to the rotating shaft 17 of the screw roll 15 a of the screw compressor 1 by the coupling 9. The coupling part is located between the cylinder 16 and the pressure-resistant sealed casing 8 and is located inside the connecting casing 22 which completely integrates the screw compressor 1 and the hermetic motor 2 in a gas-tight manner.

The iron core constituting the stator 3 is formed by applying a fluorine resin to the surface of a thin iron plate or the like for each iron plate, laminating it to a desired thickness, and then integrating it. Thereby, the insulation is maintained and the occurrence of iron loss is prevented.

The insulated wire 5 is composed of an aluminum wire having a purity of 99.6% or more, the surface of which is directly coated with a fluorine resin, and the insulated aluminum wire 5 is wound around a fixed iron core to a desired size. Thus, the stator wire loop 6 is formed.
In the embodiment of the present invention, the aluminum wire is 9
9.7% high purity aluminum base metal is drawn, drawn from φ9.7 mm aluminum hard material to φ3.2 mm, and annealed at 350 ° C. for about 3 hours.
It was drawn to 1.2 mm to obtain an intermediate softened material. Further, the intermediate softened material was annealed at 350 ° C. for about 3 hours to obtain a soft material. Incidentally, the tensile strength, elongation, bending value and the like of the hard material, the intermediate softening material and the soft material are as shown in Table 1.

[0026]

[Table 1]

In order to test the bending value, JIS G 352
1 (hard steel wire) and JIS G 3522 (piano wire) as shown in FIG.
This is to measure the number of cycles until the film is broken by repeating 0 ° bending. Incidentally, R indicates the radius of curvature. Further, as shown in the JIS, the twist value is a measured value of the number of twists until the wire is twisted and broken while holding both ends of the aluminum wire. D indicates a wire diameter.

When the aluminum winding of the rotating electric machine has a large elongation, the cross-sectional area is reduced and the heat generation is increased, and when the bending value is large, the workability of the winding is good. Therefore, it is preferable that the aluminum electric wire has a relatively small elongation and a relatively large bending value. As is clear from Table 1, the elongation of the hard aluminum wire is smaller than that of the intermediate softening material or the soft material, and the bending value is relatively small. In the intermediate softened material, the elongation is relatively small, and the bending value is about twice that of the hard material.

The elongation of a soft material is as large as about 20 times that of a hard material, but the bending value is three times or more that of a hard material. However,
Insufficient tensile strength to withstand current fluororesin coating. However, if the fluorine resin coating can be performed with the tensile strength of the soft material, the bending value is sufficiently large, and there is no problem if the cross-sectional area in consideration of the elongation is selected. From the above, the use of the intermediate softening material and the soft material is suitable, but the intermediate softening material is optimal. Therefore, in the present embodiment, the aluminum electric wire 5 formed from the intermediate softening material is used.

The insulated terminal 7 penetrates the side surface of the pressure-resistant sealed casing 8 and is connected to the stator wire 6 to supply electric power to the stator wire 6. Further, the stator wire loop 6 is wound around the iron core of the stator 3, and the ends of the wire loop 6 are projected from both sides of the iron core of the stator 3 in the axial direction. Also, a through stud 25 connected to the end of the wire loop 6
Is hermetically sealed and insulated from the pressure-resistant sealing casing 8 by a fluorine resin.

FIG. 2 is a cross-sectional view in which the stator 3 and the rotor 4 of the motor 2 are developed. A wire loop groove 10 is provided in the iron core of the stator 3. An insulated wire 5 whose surface is insulated with a fluorine resin is wound in a wire groove 10, and a wire 6 formed by bundling the insulated wires 5 is wrapped by a groove insulating sheet 11, and an iron core of the stator 3 is laminated. And electrically insulated. Wire 6 in wire groove 10
Fluorine resin is used as the material of the wedges 12 for storing the components. At the end of the wire loop 6 from the wire groove 10 to the next wire groove 10, the insulated wire 5 is exposed to prevent the wires from being separated, and they are collectively secured by a binding means such as a binding string or tape (not shown). Is fixed.

This prevents the insulator on the surface of the insulated wire 5 from being worn or damaged by the vibration between the respective wires. All of these materials for insulation use a fluorine resin. The rotor 4 is provided with a permanent magnet 24.

According to the above-described embodiment of the present invention, the motor as the rotary electric machine is housed in the pressure-resistant sealed casing 8 and connected to the compressor 1 as the rotary machine to form a hermetic compressor. The motor is operated in a state filled with ammonia and completely shut off from the atmosphere. At that time, since the winding of the motor is covered with fluororesin,
A stable continuous operation is performed without being attacked by or contaminating the ammonia of the refrigerant.

In the above-described embodiment of the present invention, the case where the rotary machine 1 is a screw type compressor and the rotary electric machine is used as a motor to constitute a hermetic type compression apparatus has been described. Is not limited to such a configuration. Therefore, it is needless to say that the rotary machine 1 can be used as an expansion device for expanding ammonia, and the rotary electric machine can be used as a hermetic expansion device as a generator for recovering power in expanding the refrigerant. However, the configuration is the same as that shown in FIG.

[0035]

As described above, according to the rotary electric machine coupled to the rotary machine for ammonia of the present invention, the aluminum winding of the rotary electric machine has a hermetic structure in which ammonia is filled and completely shut off from the atmosphere. Since the wire is directly covered with the fluorine resin, there is no possibility that the refrigerant leaks. Furthermore, the rotating electric machine does not lower the efficiency, is not affected by the ammonia of the refrigerant, does not contaminate the ammonia, enables stable continuous operation for a long time, and has a reliable and economical cooling. Can perform functions. In addition, since the aluminum electric wire only covers the aluminum electric wire directly with the fluorine resin, the coating process is very simple.

Further, according to the present invention, the insulation of the surface of the electric iron plate through which the AC magnetic flux is transmitted, the insulation film for covering the outer periphery of the wire wound and wound in the wire groove, and the wire groove for housing the wire ring Groove insulation sheet inside, wedges for holding the wire loop, insulating material for the insulation terminal connected to the wire loop and penetrating the pressure-resistant sealed casing, preventing wear and tear of the wire ring coating due to mutual vibration of the wire ring at the wire end Attachment means such as binding straps or tapes, electrical insulation for electrical parts to the material of the insulation tapes at the wire connection point at least one of the heat resistance, chemical resistance, strength and high stability Since we decided to use fluororesin,
The continuous operation of the rotating electric machine can be stably performed for a long time in combination with the fluorine resin-coated winding. Since the fluororesin covering the winding is excellent in electrical insulation and flexibility,
Fluororesin-coated windings are easy to process.

Further, by using an aluminum electric wire having a bending value of the intermediate softening material, the workability such as winding workability of the rotating electric machine is further improved.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view of a hermetic rotary device formed by connecting a rotary electric machine according to an embodiment of the present invention to a rotary machine.

FIG. 2 is an expanded sectional view of a stator and a rotor of the rotating electric machine according to the embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Rotating machine (compressor or expander) 2 Rotating electric machine (motor or generator) 5 Winding (insulated electric wire) 6 Wire ring 7 Penetration insulating terminal 8 Pressure-resistant sealed casing 9 Coupling 10 Wire groove 11 Groove insulating sheet 12 Wedge A Hermetic rotating device

────────────────────────────────────────────────── ─── Continuation of front page (56) References JP-A-5-252680 (JP, A) JP-A-9-320357 (JP, A) JP-A-9-306247 (JP, A) JP-A-50- 59473 (JP, A) Japanese Utility Model Hei 5-67165 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) H02K 3/30 H01B 1/02 H02K 5/124

Claims (3)

(57) [Claims] 1. Compression or expansion of refrigerant ammonia
Pressure-tight casing that is integrated with rotating machinery
Hermetic rotating device housed in a housing and having an airtight structure
Wherein the winding of the rotating electric machine has a purity of 99.6% or more.Armini
Aluminum electrode made of intermediate softened material or soft material
The wire has a two-layer structure in which the wire is directly covered with fluororesin.
To The wire of the aluminum intermediate softening material is made of high-purity aluminum.
Aluminum hard material obtained by drawing indium metal
After wire drawing, the first annealing was performed, and the wire was drawn again.
An electric wire, and the soft material is obtained by further adding the intermediate softener to the second
It is an electric wire obtained by performing dulling A.
A rotating electric machine that is connected to a rotating machine for Mononia. 2. An electric wire made of the intermediate softening material,
The wire before dulling is hardened, and the intermediate softened
When the wire obtained by dulling is made of soft material,
For softened materials, the elongation is much smaller than for soft materials and close to that of hard materials.
The bending value is about twice that of the hard material,
For wires with a twist value higher than that of hard and soft materials
The rotary machine for ammonia according to claim 1, wherein
Rotating electric machine combined with machine. 3. A rotation constituting a hermetic type rotation device.
When the electric machine is a hermetic motor, a cylindrical
Stator fitted and fixed to the inner peripheral surface of a pressure-sealed casing
However, a fluorine resin is applied to each iron plate and laminated to a desired thickness.
The stator is integrated after
A stator wire loop formed by winding the winding of claim 1;
2. The rotary machine for ammonia according to claim 1,
Rotating electric machine.