JP3118971B2 - Hermetic electric compressor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hermetic electric compressor used in refrigerators and the like.

[0002]

2. Description of the Related Art As a compressor used in a refrigerator or the like, FIG.
There is known a hermetic electric compressor 1 as shown in FIG. A compression element (not shown) for compressing the refrigerant in the closed container 2;
An electric element 4 for operating the compression element via the drive shaft 3
Is provided, and a mixed liquid 5 of the refrigerant and the refrigerating machine oil is stored at the bottom. The compression element is connected to an electric element 4 by a drive shaft 3, and the electric element 4 is supplied with power from a power supply terminal 6.

[0003] The electric element 4 has an outer peripheral surface formed in a closed container 2.
And a rotor 8 supported by the drive shaft 3 so as to keep a constant gap from the inner peripheral surface of the stator 7.

The stator 7 is composed of a core 9 in which iron plates are laminated in a cylindrical shape, and a magnet wire 10 which passes through a number of slots formed in the cylindrical direction of the core 9. Magnet wire 1 protruding from the end face of core 9
The coil ends 11 which are bundled with zeros are bound by a binding thread 12.

Since the binding yarn 12 needs to be tightly bound to prevent the coil end 11 from being disturbed by vibration or the like and without reducing productivity, it has high mechanical strength and high flexibility. Yarn woven from polyester fibers is used. This polyester fiber has a nonionic surfactant, an anionic surfactant,
An oil agent emulsified with a cationic surfactant is applied.
This oil agent is applied for the purpose of improving workability at the time of knitting the yarn and preventing dust from adhering to the fiber due to generation of static electricity, and is essential for manufacturing the binding yarn 12. . In addition, it is a well-known matter in the textile industry for the above-mentioned reason that, in general, the use of raw yarns coated with an oil containing these surfactants is also used for clothing fabrics, strings and yarns. In the prior art, the purpose of the preparation of the surfactant is to improve the workability when knitting the yarn and to prevent adhesion of dust, and the electrical insulation in the refrigerant has not been considered at all.

[0006]

However, when the binding yarn 12 is used for binding the coil end 11 in a state where the surfactant adhering to the surface thereof is not washed off, the binding yarn 12 and the binding yarn 12 are sealed. The surfactant is brought inside the electric compressor 1. Further, a part of the coil end 11 is immersed in the mixed liquid 5 of the refrigerant and the refrigerating machine oil. During the operation of the hermetic electric compressor 1, the rotation of the rotor 8 stirs the mixed liquid 5 of the refrigerant and the refrigerating machine oil. A phenomenon such as washing out of 11 occurs. As a result, the surfactant adhering to the binding yarn 12 is mixed into the mixed liquid 5 of the refrigerant and the refrigerating machine oil.

When the insulation resistance of the mixture 5 of the refrigerant and the refrigerating machine oil is sufficiently large, the dissolved surfactant is not a problem, but a refrigerant having a small volume resistivity such as HFC134a is used as the refrigerant. When a nonionic surfactant / cationic surfactant is used for the above, the decrease in volume resistivity due to the incorporation of the surfactant cannot be ignored. This decrease in volume resistivity leads to a decrease in electrical insulation between the closed casing 2 of the hermetic electric compressor 1 and the power supply terminal 6, and has a problem that a leak current increases.

An object of the present invention is to solve the above-mentioned conventional problems, and an object of the present invention is to provide a hermetic electric compressor using a binding yarn which does not cause an increase in leakage current of the hermetic electric compressor.

[0009]

In order to achieve the above object, the hermetic electric compressor according to the present invention comprises a nonionic surfactant or a cationic surface-active agent applied to a binding yarn during the production of the binding yarn. A binding yarn coated with an antistatic agent emulsified only with an anionic surfactant without using an activator is bound to a coil end. Further, the binding yarn obtained by applying an antistatic agent having the total amount of the nonionic surfactant and the cationic surfactant smaller than the amount of the anionic surfactant is bound to the coil end.

[0010]

According to the present invention, therefore, nonionic surfactants or cationic surfactants are not mixed into the mixture of the refrigerant and the refrigerating machine oil from the binding yarn, or even if mixed, less than half of the total amount. , It is possible to prevent a decrease in the volume resistivity of the mixture of the refrigerant and the refrigerating machine oil,
An increase in leakage current of the hermetic electric compressor can be prevented.

FIG. 2 is a characteristic diagram showing an experimental example of the effect of suppressing the increase in leakage current of the binding yarn 12 used in the present invention. First,
An electrode to which an AC voltage of 100 V and 60 Hz was applied was installed in the refrigerant HFC134a, and a leakage current at this time was measured for 50 minutes. Thereafter, the same length of the case where one motor of the binding yarn 12 coated with the oil agent emulsified only with the nonionic surfactant is injected into the refrigerant, and the same length of the binding yarn 12 coated with the oil agent emulsified only with the cationic surfactant. Three kinds of leak currents were measured when charged into the refrigerant, and when the binding yarn 12 coated with the oil agent emulsified only with the anionic surfactant was injected into the refrigerant for the same length. As a result, as is apparent from FIG. 3, the binding yarn coated with the oil agent emulsified only with the anionic surfactant hardly increased the leak current.
The binding yarn 12 coated with the oil agent emulsified with each of the nonionic surfactant and the cationic surfactant alone clearly increased the leak current.

[0012]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
The description of points that are the same as those of the related art will be omitted with reference to FIG.

(Embodiment 1) The first embodiment of the present invention is different from the prior art in that an antistatic agent which must be applied in the production process of the binding yarn 12 is replaced with a nonionic surfactant or a cationic interface. A binder yarn emulsified with only an anionic surfactant not containing an activator and treated with the antistatic agent for use in binding the coil end 11;
As shown in detail in FIG. 3, the coil end 11 protruding from the end face of the core 9 is
Are united. This binding is performed on the entire circumference of the stator 7 in the circumferential direction.

As described above, in the hermetic electric compressor 1 using the binding yarn 12 in the present embodiment, the antistatic agent containing the nonionic surfactant or the cationic surfactant is not attached to the binding yarn 12. An antistatic agent is not mixed into the mixture 5 of the refrigerant and the refrigerating machine oil. Therefore, since the volume resistivity of the mixture 5 of the refrigerant and the refrigerating machine oil does not decrease, the electrical insulation between the closed casing 2 and the power supply terminal 6 of the hermetic electric compressor 1 does not decrease, and the leak current increases. do not do.

FIG. 4 shows an example of the effect of this embodiment. The leak current of the stator 7 using the binding yarn 12 in this embodiment is clearly lower than that of the conventional stator using the binding yarn to which the antistatic agent is attached. In the figure, the region where the leakage current monotonously increases has nothing to do with the presence or absence of the antistatic agent.

(Embodiment 2) Next, a second embodiment of the present invention will be described. This embodiment is different from the first embodiment in that instead of using the binding yarn 12 coated with an antistatic agent emulsified only with a nonionic surfactant or an anionic surfactant containing no cationic surfactant. , Binding yarn 12
Bound yarn produced by applying an antistatic surfactant whose total sum of nonionic surfactant and cationic surfactant is smaller than the amount of anionic surfactant to the antistatic surfactant applied during the production process 12 is to be used. FIG. 5 is a characteristic diagram showing a change in leakage current in the second embodiment of the present invention, and shows a closed type when the ratio of a surfactant used as an antistatic agent of the binding yarn 12 is changed as shown in FIG. It can be seen that the leakage current characteristics of the electric compressor rapidly decrease when the total amount of the nonionic surfactant and the cationic surfactant is reduced to 50% of the total amount of the surfactant.

As described above, in the hermetic electric compressor 1 using the binding yarn 12 in the present embodiment, the nonionic surfactant and the cationic surfactant are contained in the mixture 5 of the refrigerant and the refrigerating machine oil from the binding yarn 12. HFC is added to the refrigerant by preventing it from being mixed or by controlling it to less than half of the total amount even if mixed.
Even when a material having a small volume resistivity such as 134a is used, its volume resistivity does not decrease, so that the electrical insulation between the sealed container 2 and the power supply terminal 6 of the hermetic electric compressor 1 does not decrease. Also, the leakage current does not increase.

Next, the leakage current characteristic of the hermetic electric compressor having the above configuration will be described. A fixed amount of a mixture 5 of refrigerant and refrigerating machine oil was sealed in the hermetic electric compressor 1 having the configuration of the present invention, and an AC voltage of 100 V and 50 Hz was applied between the hermetic container 2 and the power supply terminal 6. At this time, the leak current was reduced to one-fourth as compared with a conventional hermetic electric compressor using a nonionic surfactant or a cationic surfactant as an antistatic agent for the binding yarn 12.

[0019]

As is clear from the above examples, according to the present invention, as the antistatic agent applied in the production process of the binding yarn, one emulsified with only an anionic surfactant is used and treated with this antistatic agent. Since the coil ends are tied by the tied binding yarn, the antistatic agent containing a nonionic surfactant or a cationic surfactant is not mixed into the mixture 5 of the refrigerant and the refrigerating machine oil, or the total Less than half. As a result, a decrease in the volume resistivity of the mixture of the refrigerant and the refrigerating machine oil can be prevented, the electrical insulation between the sealed container and the power supply terminal of the sealed electric compressor is kept good, and the leak current does not increase. .

In addition, a binding yarn produced using only an anionic surfactant without using a nonionic surfactant or a cationic surfactant as a surfactant to be applied in the production process of the binding yarn is bound to a coil end. Non-ionic surfactants and cationic surfactants do not mix into the mixture of refrigerant and refrigerating machine oil from the binding yarn because the closed type electric compressor is configured, and the volume resistivity of this mixture does not decrease. It is possible to realize a hermetic electric compressor having a small leak current without lowering the electrical insulation between the hermetic container and the power supply terminal of the hermetic electric compressor.

[Brief description of the drawings]

FIG. 1 is a partial cutaway view of a hermetic electric compressor according to one embodiment of the present invention.

FIG. 2 is a characteristic diagram showing a change in leakage current due to each binding yarn in the first embodiment of the present invention and a conventional example.

FIG. 3 is a front view showing details of a stator and a stator coil end of the hermetic electric compressor of the embodiment.

FIG. 4 is a characteristic diagram showing a change in leakage current in the first embodiment of the present invention and a conventional example.

FIG. 5 is a characteristic diagram showing a relation between a component ratio of a surfactant and a leak current in a second embodiment of the present invention.

[Explanation of symbols]

 2 Closed container 4 Electric element 5 Refrigerant and refrigerating machine oil 7 Stator 8 Rotor 11 Coil end 12 Bundling thread

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Claims (2)

(57) [Claims] 1. A hermetic electric compressor in which an electric element comprising a stator and a rotor is provided in a hermetically sealed container, and a refrigerant and a refrigerating machine oil are enclosed therein, wherein a non-ionic surfactant is used as a binding thread at a coil end of the stator. Alternatively, a hermetic electric compressor using a binding yarn coated with an antistatic agent emulsified with only an anionic surfactant containing no cationic surfactant. 2. A hermetic electric compressor in which an electric element comprising a stator and a rotor is provided in an airtight container, and a refrigerant and a refrigerating machine oil are enclosed therein, wherein a non-ionic surface active agent is used as a binding yarn at a coil end of the stator. A closed electric compressor using a binding yarn coated with an antistatic agent in which the total amount of the agent and the cationic surfactant is smaller than the amount of the anionic surfactant.