JPH10112949A - Ammonia refrigerant electric compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric compressor which has a resistance to ammonia refrigerant. SOLUTION: A refrigerant electric compressor 1000 has a compressing section 300 driven by a motor 200 in a sealed container 900. An ammonia refrigerant 600 put inside through an inlet port 500 is compressed in the compressing section 300 and the compressed refrigerant fluid 601 is discharged through an outlet section 700. An insulating material for insulating each section of the motor 200 is formed of polyphenylene sulfide resin, synthetic polystyrene resin, polyether ether ketone resin, a copolymer of fluorine resin, or polyparaphenylene benzobisoxazole resin. As for the material for lubricating oil 401, ether oil which has a compatibility with ammonia is used. A winding 211 of a stator 210 is provided with a cover which has an opening in its upper part to reserve the lubricating oil 401 sprinkled through a central hole 231 of a rotor shaft 230 and keep the winding 211 dipped in the lubricating oil 401 to keep the winding 211 away from direct contact with ammonia.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to an air conditioner
Cooling unit for home use, showcase, freezer, cooling unit for prefabricated storage, vending machine, frozen dessert manufacturing machine, commercial cooling storage, ice making machine, etc., that is, used in a wide range of industrial fields such as home use or industrial use The present invention relates to a configuration in a case where an ammonia-based fluid is used as a refrigerant fluid in a refrigerant electric compression device used for a refrigeration device, a cryogenic refrigeration device, or the like.

[0002]

2. Description of the Related Art In a refrigerant electric compressor of this type, for example, as a structure of a hermetic refrigerant electric compressor 1000 mainly used for an industrial refrigeration system or the like, a structure as shown in FIGS. Japanese Patent Application No. Hei 4-72074 and Japanese Patent Laid-Open No. 7-2 based on the application of the applicant of the present application.
08364 and the like.

Referring to FIGS. 7 and 8, a hermetic-type refrigerant electric compressor 1000 includes a refrigerant fluid 600 supplied from a suction part 500 by a compression part 300 connected to a motor 200 driven by electric power supplied from a power supply terminal 100. ,
For example, a configuration in which CFCs are compressed and discharged from the discharge unit 700 as the compressed refrigerant fluid 601 is provided inside the closed container 900.

[0004] After passing the compressed refrigerant fluid 601 through an oil separating section (not shown) or the like, the compressed refrigerant fluid 601 is supplied to a cooling load (not shown) or a refrigeration load (not shown), and a low pressure is applied by a cooling operation or a refrigeration operation. After buffered refrigerant fluid 600 is stored in an accumulator (not shown),
The circulation operation of returning to 00 is performed.

The configuration shown in FIGS. 7 and 8 is an example of a configuration in which a single Rotasco-type compression mechanism, that is, a rotary pump-type compression unit 300 is directly connected to and driven by an electric motor 200. The outer shell portion 310 mainly includes a cylindrical chamber 311, that is, a cylinder frame portion 311 </ b> A for forming the cylinder chamber, and an upper bearing portion 312 and a lower bearing portion 31 for supporting the rotor shaft 230 of the electric motor 200.
3, and required portions of the outer peripheral portion are welded and held to the sealed container 900.

The compression mechanism in the cylindrical chamber 311 is mainly composed of an eccentric rotor 320 serving as a piston, a vane 325 serving as a sliding pendulum, and a spring 236 for pushing the vane 325 by elastic force. The eccentric rotor 325 includes an eccentric rotor main body 321 and a concentric cylindrical slide ring 322 surrounding an outer periphery 321A of the eccentric rotor main body 321.
Reference numeral 22 denotes an outer periphery 321A of the eccentric rotor main body 321 formed integrally with the rotor shaft 230, and an inner wall 31 of the cylindrical chamber 311.
This is interposed in order to improve the slip with respect to 1B.

Then, the eccentric rotor 321 is changed from the state shown in FIG.
Rotates clockwise, a suction chamber partitioned by vanes 236 is formed between the outer periphery 322A of the slide ring 322 and the inner wall 311B of the cylindrical chamber 311. The refrigerant fluid 600 is sucked into the suction chamber. , The suction chamber changes to a compression chamber, compresses the refrigerant fluid 600 inside, and discharges the compressed refrigerant fluid 601 from the discharge port 701 to the closed container 9.
After the ink is ejected to the space portion 901 of 00, the ink is ejected from the ejection section 700.

The electric motor 200 is a motor in which a naked induction motor is fixed in a sealed container 900 and includes a rotor 220.
The center hole is fixed to the outer periphery of the rotor shaft 230, for example, by press-fitting and fixed, and the outer periphery of the stator 210 is, for example, press-fitted and fixed to the inner wall of the outer shell 900A of the closed casing 900.

The rotor 220 is formed by casting a “cage” type winding 221 into a laminated magnetic core 222.
0 is formed by applying a winding 211 to a laminated magnetic core 212. In addition, after the compression unit 300 and the electric motor 200 are housed and fixed in the closed container 900, the upper lid portion 910 is welded and fixed to form a closed shape.

Then, a lubricating oil 401, for example, a naphthenic mineral oil is supplied from a lubricating oil inlet 410 provided at the bottom side of the closed vessel 900, and the lubricating oil 401 is positioned at an intermediate position of the height of the cylindrical chamber 311, that is, A The lubricating oil 401 is stored up to a position of about −A, and the lubricating oil 401 separated and radiated by the oil separating unit (not shown) is returned from the lubricating oil inlet 410.

The rotor shaft 230 has a through hole 231 at the center.
The lubricating oil suction pump 420 is formed by press-fitting and fixing the vertical screw 421 and the suction port 422 at the lower end side of the through hole 231.
Of the lubricating oil 40 from the bottom of the closed container 900.
And lubricating oil 401 through the through-hole 231.
In addition to being sprinkled from the upper end side as shown by an arrow 403, a small oil guide hole 231A
231B, a portion of the motor 200 and the compression unit 300 that causes friction of each motion mechanism, that is,
By supplying the lubricating oil to the mechanical kinetic friction portion, a lubricating oil circulation system is formed.

Further, the rotary pump type compression portion in the configuration of the first prior art is changed to a scroll pump type compression portion 300 for rotating a spiral movable blade in a fixed side spiral groove. (Hereinafter referred to as “second prior art”) is disclosed in Japanese Patent Application Laid-Open No.
925.

In the first and second prior arts described above,
As the refrigerant fluid, CFCs or CFC alternatives for avoiding pollution of CFCs are used. When this CFC alternative is used, it is used at each location of the electric motor 200 that requires electrical insulation (referred to as insulation in the present invention). Japanese Patent Application Laid-Open No. Hei 8-149729 discloses a configuration in which the use of a melt-anisotropic aromatic polyester as the material of the insulating material improves the resistance of the electrically insulating portions (hereinafter referred to as a third conventional technique).
Is disclosed.

Further, when ammonia, that is, NH3 is used as a refrigerant fluid, if a bare motor is used as the motor 200 as in the first prior art and the second prior art, the insulation of the motor 200 can be reduced. Since each required part has no resistance, the electric motor 200 and the compression unit 300 are housed in separate sealed cans, respectively, and ammonia leaked from a shaft passing through the sealed can of the compression unit 300 is removed at a predetermined position. (Hereinafter, referred to as a fourth prior art) is disclosed in Japanese Patent Application Laid-Open No. 7-71382. Further, in the fourth prior art, the stator 210 and the rotor 220 of the electric motor 200 are connected to each other. (Hereinafter referred to as a fifth related art)
And to avoid danger from leaking ammonia,
Japanese Patent Application Laid-Open No. H07-107572 discloses a configuration in which the operation is stopped after reducing the pressure of ammonia by no-load operation (hereinafter, referred to as a sixth conventional technique).
35074.

[0015]

In the case of the refrigerant electric compressor 1000 using ammonia as a refrigerant fluid, the configuration in which the electric motor 200 is housed in a sealed can as in the fourth and fifth prior arts described above is as follows. In addition to the complicated sealing structure, heat generated during operation of the motor 200 is trapped in the sealed can.
As the limit for heat generation from the magnetic core becomes stricter, it is necessary to take measures such as making the current capacity of the winding sufficiently large for the required current amount, or making the size of the sealed can sufficiently large. Cannot be provided in a small size and at low cost.

In the case where the stator 210 and the rotor 220 are separated by a sealed can, the magnetic force gap between the stator 210 and the rotor 220 is increased by the amount of the sealed can, so that the substantial driving force is generated. In the case where the entire motor 200 is partitioned by a sealed can, the driving force is reduced by the frictional resistance of the mechanical seal to protrude the rotor shaft 230 out of the can in a sealed state, so that the efficiency as a whole is reduced. However, there is a disadvantage that it is inferior in energy saving.

In order to cope with this inconvenience, even if a bare electric motor 200 is used and the material used for the insulating portion is made of the above-mentioned melt-anisotropic aromatic polyester according to the fourth conventional technique, it does not react with ammonia. Is not resistant,
The winding 211 of the stator 210 and / or the winding of the rotor 220 (in the present invention, referred to as the winding of the electric motor) may cause inconvenience such as peeling of the insulating film of the winding due to corrosion of the wire itself. .

Further, in the first prior art to the sixth prior art, since mineral oil is used as the lubricating oil, the compatibility with ammonia is poor, so that the pipes circulating to the cooling load or the refrigeration load are placed at low places. The pool is collected in a lubricating oil reservoir, and each time the amount exceeds a predetermined amount, the on-off valve is opened to return the refrigerant to the refrigerant electric compressor 1000. There is a disadvantage that a complicated configuration such as a fluid and ammonia is required. For this reason, there is a problem that it is desired to provide a compact and inexpensive ammonia refrigerant electric compressor that eliminates such disadvantages.

[0019]

SUMMARY OF THE INVENTION The present invention provides an ammonia refrigerant in which a compression section for compressing a refrigerant fluid by ammonia as described above and a naked electric motor for driving the compression section are housed in a closed container. In the electric compression device, an insulating material for insulating each part of the above-mentioned electric motor is made of polyphenylene sulfide resin, synsystec polystyrene resin, polyether ether ketone resin, copolymer of fluorine resin, polyparaphenylene benzobisoxazole resin. A first means for providing an insulating material means formed by using any one of them;
Configuration and

In the ammonia refrigerant electric compressor similar to the ammonia refrigerant electric compressor of the first configuration, the element wire in which the winding wire of the motor is formed using a nickel-plated copper wire or a tin-plated copper wire. Forming means and using the insulating film of the above-mentioned wire, using any one of polyphenylene sulfide resin, syntectic polystyrene resin, polyether ether ketone resin, copolymer of fluororesin, polyparaphenylene benzobisoxazole resin A second configuration having an insulating film forming means formed by

In the ammonia refrigerant electric compressor similar to the ammonia refrigerant electric compressor of the first configuration, the insulating intervening layer for interposing and insulating the outer periphery of the wire bundle of the electric motor is made of polyphenylene sulfide. Any one of a resin, a syntectic polystyrene resin, a polyetheretherketone resin, a copolymer of a fluororesin, and a polyparaphenylenebenzobisoxazole resin
A third configuration in which means for forming an insulating intervening layer formed by using one is provided;

In the ammonia refrigerant electric compressor similar to the ammonia refrigerant electric compressor in the first configuration, the binding string for binding the wire bundle of the electric motor winding is made of a polyphenylene sulfide resin, a thin systec polystyrene resin, A fourth configuration in which a tying string forming unit is formed by using any one of a polyether ether ketone resin, a copolymer of a fluororesin, and a polyparaphenylene benzobisoxazole resin;

In the ammonia refrigerant electric compressor similar to the ammonia refrigerant electric compressor of the first configuration, the tubular cover for insulating and protecting the connection portion of the winding of the electric motor is made of a polyphenylene sulfide resin, a syntectic polystyrene resin. A fifth configuration in which a tubular cover forming means is formed by using any one of a polyether ether ketone resin, a copolymer of a fluororesin, and a polyparaphenylene benzobisoxazole resin;

A compression section for compressing the refrigerant fluid by ammonia, a naked motor for driving the compression section, and a circulation for circulating a lubricating oil for lubricating a mechanical frictional movement between the compression section and the motor. And a sixth container provided with a lubricating means for performing the above-described lubrication using an oil material having compatibility with the above-mentioned ammonia in an ammonia refrigerant electric compressor in which the system is housed in a closed container, for example, ,

A seventh structure in which a lubricating means for performing the above-mentioned lubrication using ether-based oil as the above-mentioned lubricating oil is provided in place of the lubricating means in the sixth structure;

In the ammonia refrigerant electric compression device similar to the ammonia refrigerant electric compression device in the sixth configuration, the insulating material of each part of the electric motor is made of polyphenylene sulfide resin, syncysteic polystyrene resin, polyether ether ketone resin, An insulating material means formed using any one of a copolymer of a fluororesin and a polyparaphenylenebenzobisoxazole resin, and a lubricating means performing the above lubrication using an ether oil as the lubricating oil. An eighth configuration to be provided;

In the ammonia refrigerant electric compressor similar to the ammonia refrigerant electric compressor of the sixth configuration, the above lubrication is performed by using the oil material having compatibility with the ammonia as the lubricating oil. A ninth configuration including: a lubricating unit; and a lubricating oil spraying unit that positively sprinkles the circulating lubricating oil on the winding portion of the electric motor;

A lubricating means for performing the above-mentioned lubrication by using the above-mentioned oil material having compatibility with ammonia as the above-mentioned lubricating oil; The tenth configuration in which a winding oil immersion means for storing a part of the lubricating oil is provided inside the cover solves the above problem.

[0029]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG.
An embodiment in which the present invention is implemented by changing the refrigerant fluid in the refrigerant electric compression device 1000 having the configuration of FIG. 7 to ammonia will be described.

[0030]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment will be described below with reference to FIGS.
In these figures, the portions denoted by the same reference numerals as those in FIGS. 7 and 8 are portions having the same functions as the portions denoted by the same reference numerals described in FIGS. 7 and 8, and in FIGS. The portions denoted by the same reference numerals have the same functions as the portions denoted by the same reference numerals described in any of FIGS.

The rotor 220 shown in FIG. 7 is formed by casting a thick "cage type" winding wire of aluminum by die casting. However, depending on the type of the motor, the rotor 220 may also be provided with a winding. Here, a configuration in which the present invention is applied to the winding 211 of the stator 210 will be described. .

In FIG. 1, a stator 210 is formed by winding a single conducting wire 211A as shown in FIG. 2 in a slot 213 provided in a laminated magnetic core 212 a required number of times.
A plurality of wire bundles 211y are sequentially stacked and pushed in, and are configured as respective exciting windings.
11A is formed by applying an insulating film 211b to the outside of the wire 211a.

Further, an insulating layer 211B for insulating the outer circumference of the wire bundle 211y of each winding 211 and an insulating layer 211C for insulating between the outer circumference surrounding the plurality of wire bundles 211y and the wall surface of the slot 213. And an insulating layer 211 packed between them to fix each winding 211 so as not to move.
D (these insulating layers are referred to as insulating interlayers in the present invention) are provided as insulating interlayers 211x formed of a thin sheet-like insulating material having a required size.

Further, in order to withstand vibration, a plurality of wire bundles 211y in a portion protruding outside the magnetic core 212 are bundled by tying a plurality of wire bundles 211y with a tying string 211J. Connection part 21 between terminal 211E of terminal 211 and the connection part of terminal 211E of another winding 211
An insulating tubular cover 211H for covering and insulating these portions 1F and the connection portion 211G of the predetermined winding 211 with the terminal 206F is provided. Note that the terminal 206F for supplying drive power is connected to the power supply terminal 100 via the connector 250, for example.

A test as shown in FIG. 2 was conducted in order to select from among various materials materials having excellent corrosion resistance to ammonia in the refrigerant fluid as materials to be used for insulating each part. The English abbreviations of the tested materials are as shown in Fig. 3.
It is well-known by "Plastics Age Co., Ltd." published in September 1989, "Real Plastic Glossary". As for the polyparaphenylene benzobisoxazole resin, for example, “Textile and Industry” magazine Vo
l. 52, no. 3, 1996 and the like.

First, in order to solve the above-described problem with respect to the lubricating oil 401, if the ammonia and the lubricating oil 401 are made to have a property of being mutually soluble at the operating temperature, that is, having compatibility, the compressed refrigerant fluid 601 can be obtained. Even if the oil is discharged with lubricating oil mixed therein, the cooling load or the refrigeration load can be treated as a dry evaporator.

For this reason, for example, the size of the test tube 1 and the protective container 4 in the test configuration of the sample test shown in FIG. 2 to be described later is increased so as to correspond to the amount of the sample. Without adding the required amount of the lubricating oil 401 and the ammonia solution 603 at a mixed ratio of 150 °
An aging test in which the sample was left standing at a constant temperature of about C for 14 days was performed, and a test result as shown in FIG. 5 was obtained by visual judgment. As a result, the ether-based oil had good compatibility with ammonia, and was selected as the lubricating oil 401. In the case of a conventional mineral oil, for example, a naphthenic mineral oil, no compatibility was observed at all.

The test results shown in FIG. 5 are for the case of ether-based oil, and are plotted at the time when the boundary between the lubricating oil 401 and the ammonia 603 starts to become cloudy, that is, the temperature at which the ammonia 603 starts to dissolve into the lubricating oil 401. Is defined as the "separation boundary", and the temperature is lower than the "separation boundary".
The characteristic is that ammonia 603 exceeding the threshold value begins to dissolve into the lubricating oil 401.

Next, using the lubricating oil 401 and the ammonia selected in the above test, the material of the portion where the corrosion resistance of the electric motor 200 becomes a problem is subjected to the sample test shown in FIG. Was selected.

In FIG. 2, in [first step], a lubricating oil 401 and ammonia 60 are placed on the bottom of a glass test tube 1.
After inserting 3, sample 2 is selected from among the samples shown in FIG.

In the second step, the test tube 1 is placed in a Jwar bottle 3, that is, a stainless steel thermos bottle, and liquid nitrogen 11 is placed in the bottom of the Jwar bottle 3, cooled, and evacuated by a dry vacuum pump. Then, the narrow neck portion 1A of the test tube 1 is heated and melted by a burner and sealed. That is, it is processed into an ampoule under vacuum.

In the third step, the sealed test tube 1 is
After being placed in a stainless steel protective cylinder 4 and left at a constant temperature of about 150 ° C. for 7 days and aged, the sample 2 is taken out and a visual inspection is performed to determine whether the material is usable or not. I do.

As a result of the test performed in the above-described test process, the judgment result in the judgment column of FIG. 4 was obtained. In addition,
In the sample of FIG. 4, the aluminum wire is not suitable for the stator 210 winding 211 because of its high electrical resistance, but the “cage” winding of the rotor 220 is used as a conventional technique, The rotor 220 was good as it was. In addition, the formation of the film | membrane in each film wire was formed using an appropriate coating method among varnish-like coating, electrostatic coating, powder coating, extrusion coating and the like.

From the results of the above-mentioned sample tests, it was determined that good insulation resistance could be obtained in a configuration in which the refrigerant fluid was ammonia by selecting the material of each part as follows.

{Circle over (4)} Generally, an insulating material for insulating each part of the electric motor is made of polyphenylene sulfide resin, synstec polystyrene resin, polyether ether ketone resin, copolymer of fluorine resin, polyparaphenylene benzobisoxazole. It is formed using any one of the resins.

(5) A nickel-plated copper wire or a tin-plated copper wire is used for the element wire 211a. The following members are formed by using any one of polyphenylene sulfide resin, synthetic polystyrene resin, polyetheretherketone resin, copolymer of fluorine resin, and polyparaphenylenebenzobisoxazole resin. ☆ Insulating coating 211b of element wire 211a ☆ Insulating intervening layer 211x interposed on the outer periphery of winding 211 to insulate ☆ Binding strap 21 for binding wire bundle 211y of winding 211
1J ☆ Tubular cover 211H for insulating and protecting the connection portion of winding 211. Insulating intermediate layer 211x may be, for example, a single film or a single film obtained by bonding a plurality of films. Can be used.

Next, the configuration of an embodiment in which the winding 211 of the electric motor 200 is protected by the lubricating oil 401 is shown in FIG.
This will be described below. First, in the first configuration, the lubricating oil 401 is supplied from the upper end side of the rotor shaft 230 as indicated by an arrow 403A.
Distributing member 23 for positively distributing to winding 211 side
0A, for example, provided with a "collar-like" overhanging portion having an upward inclination.

In other words, the lubricating oil 401 sucked up to the upper end side of the rotor shaft 230 is sprinkled as much as possible on the winding 211 using centrifugal force. The winding 211 is always covered with the lubricating oil 401 so as not to directly contact the compressed refrigerant fluid 601, that is, ammonia.

In the second configuration, a part of the lubricating oil 401 is stored inside the cover 215 by surrounding the winding 211 with a cover 215 having an upper opening.
Is immersed in the lubricating oil 401 and the winding 21
The portion 1 does not directly contact the compressed refrigerant fluid 601, that is, the ammonia.

The stored lubricating oil 401 overflows from the edge of the upper opening portion as shown by an arrow 403B and flows downward, or a small hole (not shown) provided on the bottom side of the cover 215. Alternatively, the cover 215 is configured to flow downward from a gap at an appropriate position.

Specifically, the cover 215 is made of a non-magnetic material, for example, an appropriate one of the above-mentioned resin materials, and the lower cover 215A is formed in an annular U-shaped cross section with an upward section. It is formed in a saucer shape and covers a portion of the winding 211 protruding to the bottom side of the magnetic core 212, and an upper cover portion 215B is formed by providing a comb-shaped portion 215B1 in a cylindrical lower portion. Is inserted into the slot 213 of the magnetic core 212 so that the magnetic pole surface 212A of the magnetic core 212 is exposed, and the lower end portion 215B2 of the comb-like portion 215B1 is attached to the inner edge portion 215A1 of the lower covering portion 215A, for example, by a small protrusion. It is fixed by a mechanical holding method such as hooking with 215B3, or hooking with an appropriate entry claw, or caulking.

According to this configuration, since the magnetic pole surface 212A is exposed, the lubricating oil 401 can be stored without reducing the magnetic force of the magnetic pole surface between the stator 210 and the rotor 220. In addition, the lower cover 215A
The upper cover portion 215B may be formed using an austenitic stainless steel material, for example, a stainless steel plate material such as SUS316 standard.

[Summary of Configuration of the Embodiment] In summary of the configuration of the above-described embodiment, a compression unit 300 for compressing a refrigerant fluid by ammonia and a naked motor 200 for driving the compression unit 300 are hermetically sealed. In the ammonia refrigerant electric compression device 1000 housed in the container 900, the insulating material for insulating each part of the electric motor 200 is made of polyphenylene sulfide resin, synstec polystyrene resin,
A first configuration in which an insulating material means is formed using any one of a polyetheretherketone resin, a copolymer of a fluororesin, and a polyparaphenylenebenzobisoxazole resin;

A refrigerant electric compressor 1000 similar to the ammonia refrigerant electric compressor 1000 in the first configuration.
, The wire 21 of the winding 211 of the electric motor 200
A wire forming means for forming 1a using a nickel-plated copper wire or a tin-plated copper wire; and forming an insulating film 211b of the wire 211a by using a polyphenylene sulfide resin, a syntectic polystyrene resin, a polyetheretherketone resin, a fluorine-based resin. A second configuration in which an insulating film forming unit formed using any one of a resin copolymer and a polyparaphenylene benzobisoxazole resin is provided;

In the ammonia refrigerant electric compressor 1000 similar to the ammonia refrigerant electric compressor 1000 in the first configuration, the winding 21 of the electric motor 200 is used.
The insulating intervening layer 211x for interposing and insulating the outer periphery of the single wire bundle 211y is formed of polyphenylene sulfide resin.
A third configuration in which an insulating intervening layer forming means formed by using any one of a syntectic polystyrene resin, a polyetheretherketone resin, a copolymer of a fluorine-based resin, and a polyparaphenylenebenzobisoxazole resin,

In the ammonia refrigerant electric compressor 1000 similar to the ammonia refrigerant electric compressor 1000 in the first configuration, the winding 21 of the electric motor 200 is used.
The binding string 211J for binding the single wire bundle 211y is made of any one of a polyphenylene sulfide resin, a synthetic polystyrene resin, a polyetheretherketone resin, a copolymer of a fluororesin, and a polyparaphenylenebenzobisoxazole resin. A fourth configuration for providing a tying string forming means formed by

In the ammonia refrigerant electric compressor 1000 similar to the ammonia refrigerant electric compressor 1000 in the first configuration, the winding 21 of the electric motor 200 is used.
The tubular cover 211H that insulates and protects the connection portion 1 is made of any one of a polyphenylene sulfide resin, a syntectic polystyrene resin, a polyetheretherketone resin, a copolymer of a fluororesin, and a polyparaphenylenebenzobisoxazole resin. A fifth configuration in which a tubular cover forming means formed by forming is formed;

A compression unit 300 for compressing the refrigerant fluid by ammonia, a naked electric motor 200 for driving the compression unit 300, and a mechanical frictional motion between the compression unit 300 and the electric motor 200, for example, a compression unit Lubricating oil 4 for lubricating the compression mechanism portion of portion 300 and the bearing portion of electric motor 200
01, for example, in the ammonia refrigerant electric compressor 1000 in which a circulation system for sucking the bottom lubricating oil 401 from the lower end side of the through hole 231 and dispersing it from the upper end side is housed in a closed container 900. A sixth configuration in which a lubricating unit that performs the above-described lubrication using an oil material having compatibility with the above-described ammonia, for example, an ether-based oil,

A seventh structure in which a lubricating means for performing the above-mentioned lubrication by using an ether-based oil as the above-mentioned lubricating oil 401 is provided in place of the lubricating means in the sixth structure,

In the ammonia refrigerant electric compression device 1000 similar to the ammonia refrigerant electric compression device 1000 in the sixth configuration, the insulating material of each part of the electric motor 200 is made of polyphenylene sulfide resin, syncysteic polystyrene resin, polyether ether. Insulating means formed using any one of a ketone resin, a copolymer of a fluororesin, and a polyparaphenylenebenzobisoxazole resin, and performing the above lubrication using an ether oil as the lubricating oil 401 An eighth configuration including a lubrication unit;

In the ammonia refrigerant electric compression device 1000 similar to the ammonia refrigerant electric compression device 1000 in the above-described sixth configuration, an oil material having compatibility with the above-described ammonia, for example, an ether-based oil is used as the lubricating oil. A lubricating means for performing the above-described lubrication by using the lubricating oil 401 and the circulating lubricating oil 401 are provided, for example, on the winding portion of the electric motor 200, for example, on the winding portion 211, by distributing a member 230 A for distribution. A ninth configuration in which lubricating oil sprinkling means for actively sprinkling is provided;

A lubricating means for performing the above-described lubrication by using an oil material compatible with the above-mentioned ammonia, for example, an ether-based oil as the above-mentioned lubricating oil 401, and the above-mentioned electric motor 200
, For example, a portion of the winding 211 is surrounded by a cover having an open top, such as a cover 215.
And a tenth configuration in which a winding oil immersion means for storing a part of the lubricating oil 401 is provided inside.

[Modification] The present invention can be modified as follows. (1) The above-mentioned winding 21
It is configured by using the same material as the material used for 1.

(2) The winding provided on the rotor 220 is also provided with a cover similar to the cover 215 described above. (3) A configuration in which the first to tenth configurations are applied to the ammonia refrigerant electric compression device 1000 in which the compression unit 300 is configured by another compression mechanism, for example, the compression mechanism of the second related art. I do.

(4) A configuration in which the above-described first to tenth configurations are applied to an ammonia refrigerant electric compression device 1000 having a configuration in which the compression unit 300 is disposed on the upper side and the electric motor 200 is disposed on the lower side. I do.

[0066]

According to the present invention, as described above, the element wire of the winding of the electric motor, the insulating film, the insulating intervening layer for the winding of the winding, the binding cord of the winding of the winding, and the terminal connection of the winding. The tubular cover for insulating and protecting the parts is made of a material resistant to ammonia, and the lubrication of the mechanical friction movement parts of the electric motor and the compression part is made of lubricating oil compatible with ammonia. Therefore, the ammonia refrigerant electric compression device can be configured using a naked motor, so that there are features such as providing a small and inexpensive device and prolonging its life.

[Brief description of the drawings]

FIGS. 1 to 6 show an embodiment of this invention, and FIGS. 7 and 8 show a prior art. The contents of each figure are as follows.

FIG. 1 is a perspective view and a cross-sectional view of a main part configuration.

FIG. 2 Test process diagram

[Figure 3] List of English abbreviations

FIG. 4 Test evaluation chart

FIG. 5 is a test evaluation chart

FIG. 6 is a longitudinal sectional view of a main part configuration.

FIG. 7 is a longitudinal sectional view of the entire configuration.

FIG. 8 is a cross-sectional view of a main part configuration.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Test tube 1A Narrow neck part 2 Sample 3 Jawa bottle 4 Protective cylinder 11 Liquid nitrogen 100 Power supply terminal 200 Motor 206F Terminal 210 Stator 211 Winding 211A Conductive wire 211B Insulating layer 211C Insulating layer 211D Insulating layer 211E Terminal 211F Connecting part 211G Connecting part 211H Insulated tubular cover 211J Tying cord 211a Element wire 211b Insulating film 211y Wire bundle 211x Insulating intermediate layer 212 Magnetic core 212 Magnetic pole surface 213 Slot hole 215 Cover 215A Lower cover portion 215A1 Inner edge portion 215B Upper cover portion 215B1 Comb portion 215B2 Lower end portion Rotor 221 “Cage-type” winding 222 Magnetic core 230 Rotor shaft 230A Spreading member 231 Through hole 231A Oil guide hole 231B Hole guide hole 250 Connector 300 Compressor 310 Outer shell 311 Cylindrical chamber 3 1A Cylinder frame part 311B Inner wall 312 Upper bearing part 313 Lower bearing part 320 Eccentric rotor 321 Eccentric rotor body 321A Outer circumference 322 Slide ring 322A Outer circumference 325 Vane 326 Spring 401 Lubricant 403 Arrow 403A Arrow 410 Lubricant inlet 420 Lubricant suction pump Type screw 422 Suction port 500 Suction part 600 Refrigerant fluid 601 Compressed refrigerant fluid 603 Ammonia liquid 700 Discharge part 701 Discharge port 900 Sealed container 900A Outer shell 901 Space part 910 Top lid part 1000 Refrigerant electric compressor

Claims (10)

[Claims] 1. An ammonia refrigerant electric compressor in which a compression unit for compressing a refrigerant fluid by ammonia and a naked electric motor for driving the compression unit are housed in a hermetically sealed container, wherein each part of the electric motor is An insulating material formed using any one of a polyphenylene sulfide resin, a synthetic polystyrene resin, a polyetheretherketone resin, a copolymer of a fluororesin, and a polyparaphenylenebenzobisoxazole resin. Ammonia refrigerant electric compressor characterized by comprising means. 2. An ammonia refrigerant electric compressor in which a compression section for compressing a refrigerant fluid by ammonia and a naked electric motor for driving the compression section are housed in a hermetically sealed container, wherein a winding of the electric motor is provided. Wire forming means for forming a wire using a nickel-plated copper wire or a tin-plated copper wire; and forming an insulating film of the wire by using a polyphenylene sulfide resin, a syntectic polystyrene resin, a polyetheretherketone resin, a fluororesin. And an insulating film forming means formed by using any one of the above-mentioned copolymer and polyparaphenylene benzobisoxazole resin. 3. An ammonia refrigerant electric compressor in which a compression section for compressing a refrigerant fluid by ammonia and a naked electric motor for driving the compression section are housed in a hermetically sealed container, wherein a winding of the electric motor is provided. The insulating intervening layer to be interposed and insulated on the outer periphery of the wire bundle of any one of polyphenylene sulfide resin, synthetic polystyrene resin, polyether ether ketone resin, copolymer of fluororesin, polyparaphenylene benzobisoxazole resin An ammonia refrigerant electric compressor, comprising: an insulating intervening layer forming means formed by using one. 4. An ammonia refrigerant electric compressor in which a compression section for compressing a refrigerant fluid by ammonia and a naked electric motor for driving the compression section are housed in a hermetically sealed container, wherein a winding of the electric motor is provided. The binding string for binding the wire bundle is formed using any one of polyphenylene sulfide resin, syntectic polystyrene resin, polyether ether ketone resin, copolymer of fluororesin, and polyparaphenylene benzobisoxazole resin. An ammonia refrigerant electric compression device, comprising a binding string forming means. 5. An ammonia refrigerant electric compressor in which a compression section for compressing a refrigerant fluid by ammonia and a naked electric motor for driving the compression section are housed in a hermetically sealed container, wherein a winding of the electric motor is provided. A tubular covering that insulates and protects the connection
A tubular covering forming means formed by using any one of a polyphenylene sulfide resin, a syntectic polystyrene resin, a polyetheretherketone resin, a copolymer of a fluororesin, and a polyparaphenylenebenzobisoxazole resin is provided. Ammonia refrigerant electric compressor. 6. A compressor for compressing a refrigerant fluid by ammonia, a naked motor for driving the compressor, and a circulation for circulating lubricating oil for lubricating a mechanical frictional motion portion between the compressor and the motor. An ammonia refrigerant electric compression device containing a system in an airtight container, comprising: a lubricating means for performing the lubrication using an oil material compatible with the ammonia. Electric compression device. 7. A compression section for compressing a refrigerant fluid by ammonia, a naked electric motor for driving the compression section, and a circulation for circulating lubricating oil for lubricating a mechanical frictional motion portion between the compression section and the electric motor. An ammonia-refrigerant electric compressor, comprising a system and a system housed in a hermetically sealed container, comprising: a lubricating means for performing the lubrication using ether-based oil as the lubricating oil. 8. A compression section for compressing a refrigerant fluid by ammonia, a naked electric motor for driving the compression section, and a circulation for circulating lubricating oil for lubricating a mechanical friction motion portion between the compression section and the electric motor. And a system in which the system is housed in a hermetically sealed container, wherein the insulating material of each part of the electric motor is made of a polyphenylene sulfide resin, a synthetic polystyrene resin, a polyetheretherketone resin, and a fluorine-based resin. Ammonia, comprising: an insulating material means formed by using any one of a coalesced and polyparaphenylene benzobisoxazole resin; and a lubricating means for performing the lubrication by using an ether-based oil as the lubricating oil. Refrigerant electric compressor. 9. A compressor for compressing a refrigerant fluid by ammonia, a naked motor for driving the compressor, and a circulation for circulating lubricating oil for lubricating a mechanical frictional motion portion between the compressor and the motor. And a lubricating means for performing the lubrication by using an oil material having compatibility with the ammonia as the lubricating oil, wherein the circulating means comprises: An ammonia refrigerant electric compressor, comprising: a lubricating oil sprinkling means for positively sprinkling lubricating oil on a winding portion of the electric motor. 10. A circulation section for circulating a lubricating oil for lubricating a compression section for compressing a refrigerant fluid by ammonia, a naked electric motor for driving the compression section, and a mechanical frictional motion section between the compression section and the electric motor. And a system for housing the system in a hermetically sealed container, wherein the lubricating means performs the lubrication using an oil material having compatibility with the ammonia as the lubricating oil, and a winding of the electric motor. An ammonia refrigerant electric compressor, wherein the wire portion is surrounded by a cover having an open top, and winding oil immersion means for storing a part of the lubricating oil is provided inside the cover.