JP2825438B2 - Motor tying strap - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor tying strap, and more particularly to a motor tying strap for binding a copper wire (coil end) of a motor of a compressor of a refrigerator or an air conditioner using alternative Freon.

[0002]

2. Description of the Related Art Conventionally, a motor binding cord has been used to bind a copper wire of a motor of a compressor of a refrigerator, a freezer, an air conditioner or the like. This motor tying cord is used by being immersed in the refrigerant or in contact with the refrigerant. When Freon 11, 12, 114, 115 or the like is used as a refrigerant, the motor tying cord is made of a synthetic fiber such as a polyester fiber made of commercially available polyethylene terephthalate, which can be used as it is as a twisted or braided product. There was no performance problem with.

[0003] However, the above-mentioned conventional chlorofluorocarbon may destroy the ozone layer of the earth, and its use will be regulated in the future by laws and voluntary regulations of the industry. These alternative Freons include Freon 134a
(Ozone depletion coefficient 0) and Freon 22 (Ozone depletion coefficient 0.05) are being studied.

[0004]

However, when a conventional tying string is used as a refrigerant using these alternative fluorocarbons as a refrigerant, monomers and oligomers existing in the fibers are extracted by the refrigerant, and as a result, the refrigerant is extracted into the refrigerant. The current leaks, causing an abnormal current to blow the fuse. Under such circumstances, there is a strong demand from many electric appliance manufacturers to develop a motor tying string that exhibits the same performance as the conventional one even when the alternative fluorocarbon is used.

In response to these demands, the present inventors have disclosed in JP-A-6-024 that an emulsifier and an antistatic agent constituting an oil agent for synthetic fibers may be selected from anionic ones.
No. 461.

In Japanese Utility Model Laid-Open No. 4-128063, it has been proposed to use a conventional motor tying cord by removing the oil agent by boiling washing. However,
In these methods, the problem of current leakage can be solved under specific conditions, but another major problem, that of foreign matter clogging in the capillary that vaporizes the refrigerant, has not been improved. found. If this problem is not remedied, the refrigerant will not be sufficiently circulated due to clogging, so that cooling will not be sufficiently performed, and the use of alternative CFCs will not progress. Further, in the case of a rotary type motor in which the motor is immersed in a refrigerant, the situation is not necessarily completed.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and provides a motor tying string which is suitable as a substitute for chlorofluorocarbon, does not reduce electrical insulation, and does not cause foreign matter to be clogged in a capillary for vaporizing a refrigerant. The purpose is to:

[0008]

In order to achieve the above object, a motor tying cord of the present invention comprises a methane or ethane type
Fluorocarbon 1 in which carbon contains hydrogen atoms in addition to halogen atoms
34a, 123, 141b, 22, 142b and 152
a refrigerant containing at least one selected from a
Multi-filler made of synthetic fiber for motor application
Motor tying string consisting of
The synthetic fiber is polyethylene naphthalate or ethylene.
It is a copolymer containing a naphthalate component, and the amount of xylene extracted after removing the oil agent attached to the synthetic fibers is 0.30% by weight or less.

In the above construction, the amount of xylene extracted is
It must be in the range of 0.01% by weight to 0.25% by weight.
Is preferred. Monomers and oligomers present in the fiber
Is more difficult to be extracted into the refrigerant.

In the above construction, the synthetic fiber multi-layer
Twist the filament or spun yarn to form a braid.
It is preferable that it is looked up. Also, set the string
After lifting, it is preferable that the oil agent is removed.

[0011]

According to the structure of the present invention, the motor tying cord is made of synthetic fiber and has an xylene extraction amount of 0.30% by weight or less after removing the oil agent contained in the synthetic fiber. Further, it is possible to realize a motor tying string that does not lower the electrical insulation and does not cause foreign matter to be clogged in the capillary that vaporizes the refrigerant. In the above description, the removal of the oil agent includes, for example, washing with water, warm water, boiling water, etc., scouring with a surfactant or the like, or treatment with a solvent or the like. Further, the motor tying string of the present invention is a Freon that does not contain chlorine atoms that is considered to be a cause of destruction of the ozone layer, and a Freon that contains hydrogen atoms so as to be decomposed in the atmosphere before reaching the stratosphere, for example, Freon 134a, 123, 1
41b, 22, 142b, 152b and the like can be suitably used for a motor or the like using refrigerant as a substitute. As a result,
It can be suitably used for refrigerators, freezers, air conditioners and the like using alternative Freon. Further, if at least one synthetic fiber selected from an ethylene naphthalate-based polymer, polyphenylene sulfide, and an aromatic polyamide is used, it can be used for a motor using an alternative chlorofluorocarbon as a refrigerant,
It is possible to realize a motor tying cord that does not reduce electrical insulation and does not cause foreign matter to be clogged in a capillary that vaporizes a refrigerant. In addition, if a fiber made of polyethylene naphthalate or a copolymer containing an ethylene naphthalate component is used, the amount of xylene extracted is extremely low. In addition, it is possible to realize a particularly excellent motor binding cord that does not cause foreign matter clogging in the capillary that vaporizes the refrigerant.

[0012]

The present invention will be described more specifically with reference to the following examples. The present inventors, in order to solve the problems of the prior art, the occurrence of foreign matter clogging in the capillary to vaporize the refrigerant, and after removing the oil agent attached to the synthetic fiber,
As a result of a detailed study of the relationship with the amount of xylene extracted, it was found that the amount of xylene extracted should be 0.01 or more and 0.30% by weight or less in order to prevent foreign matter clogging.

[0013] Next, the amount of xylene extracted from various synthetic fibers available on the market and the tying string obtained by combining these synthetic fibers after removing the oil agent attached to the synthetic fibers was measured. The amount of xylene extracted was measured by washing the tie with petroleum ether, removing the oil agent attached to the synthetic fiber, drying, and measuring the weight to four decimal places (this weight is defined as A). Extraction treatment was performed in boiling xylene for 8 hours. Then, after washing with warm new xylene and drying, the weight was measured to four decimal places (this weight is defined as B), and the amount of xylene extraction was determined by the following equation (Equation 1).

[0014]

(Equation 1)

The main measurement results are shown in (Table 1).

[0016]

[Table 1]

From Table 1, it can be seen that it is extremely difficult with current polyethylene terephthalate fibers to reduce the xylene extraction to 0.30% by weight or less after removing the oil agent adhering to the synthetic fibers. I understand. In addition, high-viscosity polyethylene terephthalate, which is generally used for industrial materials, also reduces xylene extraction,
It can also be seen that it is not enough to prevent the foreign matter from clogging in the capillary that vaporizes the refrigerant. Furthermore, even when these polyethylene terephthalate fibers are used in combination with polyphenylene sulfide or metaphenylene terephthalamide ("NOMEX" manufactured by DuPont), the objective of the present invention is attained although it is superior to current polyethylene terephthalate fibers. Can not.

On the other hand, polyphenylene sulfide, metaphenylene terephthalamide and paraphenylene terephthalamide ("Kevlar" manufactured by DuPont) can easily reach the object of the present invention. In particular, polyethylene naphthalate has an extremely low xylene extraction amount of 0.05% by weight, and is suitable as a material for the motor tying cord. Further, the glass transition point and the melting point of the polyethylene naphthalate fiber are 113 ° C. and 273 ° C., respectively, which are higher than the 67 ° C. and 265 ° C. of the polyethylene terephthalate fiber, which is further advantageous for a motor tie that requires heat resistance. The flexibility of the tying string made of these synthetic fibers is slightly more rigid than polyethylene terephthalate fiber, but it is hard to fluff, and the tying property with an automatic racing machine is almost the same as current products. It is suitable.

The polyethylene naphthalate used in the present embodiment is a polyester fiber containing naphthalene-2,6-dicarboxylic acid as a main acid component and ethylene glycol as a main diol component. Further, a polyester synthesized by adding a third component and copolymerizing or mixing polyester may be used. As the third component, for example, alicyclic dicarboxylic acid such as adipic acid, or isophthalic acid,
Aromatic dicarboxylic acids such as diphenyldicarboxylic acid can be used. Further, additives such as a matting agent such as titanium dioxide may be contained.

As a specific method for manufacturing the motor tying string, a method proposed in Japanese Patent Publication No. 46-30972, Japanese Patent Publication No. 46-30973, Japanese Patent Application Laid-Open No. 52-107319, or the like is employed. The fibers may be made of spun yarn using filaments (long fibers) or staples (short fibers). The obtained fiber is twisted and twisted into two or three children, or four, eight, sixteen, twenty-four,
Used in the state of braids such as 32 braids. Further, a string-like body in which a sewing thread or the like is sewn into a twisted thread may be used. The obtained string-like body can be used as it is. However, it is desirable that the oil agent attached to the fibers be removed by washing before use. Water, hot water, boiling water and the like can be easily removed, but if a scouring agent and a cleaning agent are used in combination, the removal can be performed more efficiently. At this time, if the scouring agent / cleaning agent used in combination is selected from anionic surfactants,
This is advantageous in preventing current leakage. Specific examples of the anionic surfactant include soap, N-acyl amino acid salt, alkyl ether carboxylate, carboxylate such as acylated peptide, alkyl sulfonate, alkylbenzene and alkylnaphthalene sulfonate, sulfosuccinate. Acid salts, α-olefin sulfonates, sulfonates such as N-acyl sulfonates, sulfated oils, alkyl sulfates, alkyl ether sulfates, sulfates such as alkyl amide sulfates, alkyl phosphates, Phosphate salts such as alkyl ether phosphates and alkyl allyl ether phosphates.

Of course, higher processing such as dyeing and heat setting may be applied. By having the above-described configuration, it exhibits excellent electrical insulation even when used in a motor using a CFC alternative, and prevents foreign matter from being clogged in a capillary that evaporates a refrigerant. The problem that the function of the air conditioner stops functioning halfway was prevented.

Hereinafter, specific embodiments will be described. (Example 1) Two polyethylene naphthalate filament fibers (250 denier, 48 filaments) were drawn together and assembled into a squared structure by eight-stroke using a cording machine. As an oil detergent, scouring was performed at 60 ° C. for 20 minutes using sodium alkylbenzene sulfonate as an anionic surfactant.

The tensile strength of the obtained braid is 28.3k.
g, the elongation percentage was 10.8%, and the knot strength was 12.4 kg. The basis weight and the number of pitches are 0.505 g / m and 2 respectively.
4.0 p / in. Met. The amount of xylene extracted from this braid was 0.045% by weight. The obtained braid was immersed in Freon 134a containing 10% by weight of polyalkylene glycol, and the leakage current was measured.
Both before and after the immersion were unchanged at 0.4 mA or less, and the insulating properties were excellent. No difference was observed in the lacing property of the automatic lacing machine for assembling the copper wire of the tying string motor as compared with the current polyethylene terephthalate fiber, and no fuzziness and other problems were found.

A refrigerator incorporating a motor using the motor tying string obtained in this manner was mounted, and a refrigerator using Freon 22 as a refrigerant was operated for several months. No clogging was observed and no problems occurred.

(Example 2) Four polyethylene naphthalate filament fibers (1000 denier, 192 filaments) were assembled into a squared structure by four strokes using a cording machine. The resulting braid has a tensile strength of 30.1k
g, the elongation percentage was 13.7%, and the knot strength was 15.4 kg. The basis weight and the number of pitches are 0.468 g / m and 8.0 p / in. Met. The scouring for removing the oil agent was performed in the same manner as in Example 1. As a result of measuring the amount of xylene extracted from this braid, it was 0.060% by weight. The obtained braid was immersed in Freon 134a containing 10% by weight of a polyalkylene glycol, and the leakage current was measured. As a result, before and after immersion, it was 0.4 mA or less, and the insulation properties were excellent. No difference was observed in the lacing property of the automatic lacing machine for assembling the copper wire of the tying string motor as compared with the current polyethylene terephthalate fiber, and no fuzziness and other problems were found.

A refrigerator incorporating a motor using the motor tying string thus obtained was mounted, and a refrigerator using Freon 134a as a refrigerant was operated for several months. No clogging was observed and no other problems occurred.

As described above, according to the present embodiment, the motor made of synthetic fiber and having the xylene extraction amount of 0.30% by weight or less after removing the oil agent attached to the synthetic fiber is used. Even if a tying string, for example, a motor tying string made of polyethylene naphthalate fiber is used for a motor using a refrigerant such as Freon 134a, the electric insulation does not decrease, and foreign matter clogging in a capillary that vaporizes the refrigerant is prevented. It is possible to realize a motor tying string that does not cause the motor binding string.

[0028]

As described above, according to the above-described motor tying cord of the present invention, the amount of xylene extracted from synthetic fibers after removing the oil agent attached to the synthetic fibers is 0.3.
When the content is 0% by weight or less, it is possible to provide a motor tying string that does not reduce electrical insulation and does not cause foreign matter to be clogged in a capillary that vaporizes a refrigerant. Therefore, chlorofluorocarbons 134a, 123, 141b, 22, which contain hydrogen atoms in addition to halogen atoms in methane or ethane-based carbon,
It can be suitably used for motors and the like that use refrigerants such as 142b and 152a as alternative refrigerants. Also, when binding to the motor, the work can be performed efficiently and rationally and can be provided at a low cost.

Further, the synthetic fibers is ethylene naphthalate <br/> polymer over, without reducing the electrical insulation properties, can provide a motor binding string that does not generate a foreign matter clogging of a capillary vaporizing refrigerant.

When the synthetic fiber is a polyethylene naphthalate or a copolymer containing an ethylene naphthalate component, the amount of xylene extracted is extremely low, the electrical insulation is not reduced, and foreign matter is clogged in a capillary for vaporizing a refrigerant. , A particularly excellent motor tying cord that does not cause the

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) D04C 1/06 H02K 3/50 H02K 15/04

Claims (4)

(57) [Claims] 1. A methane or ethane carbon having a halogen.
Freon 134a, 12 containing hydrogen atoms in addition to atoms
3, 141b, 22, 142b and 152a.
Motor using as an alternative Freon containing at least one refrigerant
Multifilament yarns made of synthetic fibers for application to
Is a motor binding string made of a spun yarn, wherein the synthetic fiber
Is polyethylene naphthalate or ethylene naphthale
The xylene extraction amount after removing the oil agent adhering to the synthetic fiber , which is a copolymer containing a salt component, is 0.
A motor tying cord having a content of 30% by weight or less. 2. The motor tying cord according to claim 1, wherein the amount of xylene extracted is in the range of 0.01% by weight or more and 0.25% by weight or less. 3. A multifilament yarn made of synthetic fiber or
A spun yarn that is twisted and assembled into a braided state
The motor binding string according to claim 1. 4. An oil agent is removed after assembling into a string state.
The motor tying string according to claim 1, wherein