JPH10162673A - Sealed switchgear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the contact reliability of contacts of a sealed relay, a sealed switch, etc. SOLUTION: This switchgear is so constituted as to closely seal contact parts 1 in a housing 4. In this case, the inside of the housing 4 is kept in atmosphere of a lubricating agent of polyalcohols selected from hexamethyleneglycol and 2 ethyl-1,3-hexanediol. The polyalcohols selected from these materials are adsorbed on the surfaces of the contact parts 1 prior to organic gas molecules to cover the surfaces of the contact parts 1 with a film of the lubricating agent molecules and prevent adhesion of organic gas molecules to the surfaces of the contact parts 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealed switch such as a relay or a switch in which a contact portion is sealed in a housing.

[0002]

2. Description of the Related Art In a relay, if a corrosive gas enters the relay from the outside, the contacts of the relay mechanism are adversely affected by the corrosive gas, so that the relay mechanism is sealed in a housing. I have. However, in such a sealed relay, the coil portion of the electromagnet block, which forms a part of the relay mechanism, is treated with a resin or the like on its surface. The contact surface of the contact portion of the electromagnet block may be corroded by the organic gas, and the arc at the time of opening and closing the contact burns the organic gas, causing carbides to adhere to the surface of the contact. However, there is a problem that the contact reliability is lowered. Such an organic gas may be generated not only from the coil portion but also from an organic material constituting the relay, such as a resin molded product such as a coil bobbin and a housing.

Also, in a switch, when a corrosive gas enters from the outside, the contact portion of the switch mechanism is adversely affected by the corrosive gas, so that the switch mechanism is sealed in a housing. . However, even with such a sealed switch, when an organic gas is generated from a resin molded product such as a housing, the sealed housing is filled with the organic gas, and the contact surface of the contact portion of the switch mechanism is made of the organic gas. There has been a problem that corrosion may occur, and an organic gas is burned by an arc generated when the contacts are opened and closed, and carbides adhere to the surfaces of the contacts, thereby deteriorating the contact reliability of the contact portions.

In order to solve such a problem in a sealed switch such as a sealed relay or a sealed switch in which a contact portion is sealed in a housing, materials such as a coil portion, a coil bobbin and a housing which do not generate gas are selected. However, in this case, the cost of the material may increase, and it is difficult to completely prevent the generation of gas, which is not a very effective solution.

Therefore, a degassing process for removing the organic gas in advance by annealing the coil portion, the coil bobbin, the housing, and the like is performed. However, in this case, there is a problem that the manufacturing process becomes complicated. The organic gas amount inside the housing is reduced by performing a degassing process but, N ₂ in the air in the housing is burned by the opening and closing arc instead to those burning during arcing will decrease , poor contact of the contact portion NO _x is generated in the housing there is a problem in that there is a risk caused by the NO _x.

When a direct current is applied while the surface of the contact portion is clean, particularly when the contact is opened and closed with a capacitive load, the arc point at the time of opening and closing is concentrated at one point on the surface of the contact portion. A transition phenomenon occurs in which one of the contacts melts or evaporates and transfers to the other contact, causing irregularities on the surface of the contact portion, and the progress of the transition phenomenon causes rocking in which the contact is locked, causing a relay or the like. There is also a problem that a malfunction of the switch may occur.

[0007]

As described above, there is a possibility that a problem may occur in the contact reliability of the contacts in a conventional hermetic switch such as a hermetic relay or a hermetic switch. SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to improve the contact reliability of contacts in a sealed switch such as a sealed relay or a sealed switch.

[0008]

According to a first aspect of the present invention, there is provided a sealed switchgear having a contact portion sealed and housed in a housing, wherein the interior of the housing is selected from hexamethylene glycol and 2-ethyl-1,3-hexanediol. In a lubricant atmosphere composed of a polyhydric alcohol.

The invention of claim 2 is characterized in that the above-mentioned polyhydric alcohol is dissolved in hexylene glycol and used. The invention according to claim 3 is to dissolve the above-mentioned polyhydric alcohol in hexylene glycol and further add anthraquinone, anthraquinone-based dye,
Naphthoquinone, naphthoquinone derivative, perinaphthalone,
It is characterized by using a mixture selected from perinaphthalone dyes.

The invention of claim 4 is characterized in that the above-mentioned polyhydric alcohol is dissolved in ethyl alcohol and polypropylene glycol for use. Claim 5
The invention of the above (1) is characterized in that the interior of the housing is formed in an atmosphere of a lubricant composed of hexamethylene glycol and 2-ethyl-1,3-hexanediol in a hermetically sealed switch in which the contact portion is sealed and accommodated in the housing. It is assumed that.

According to a sixth aspect of the present invention, there is provided a sealed relay in which an electromagnet block having a contact portion and a coil portion is sealed and housed in a housing. The invention according to claim 7 is a sealed switch in which a switch mechanism such as a contact portion is sealed and housed in a housing.

[0012]

Embodiments of the present invention will be described below. 1 and 2 show the structure of an example of the sealed relay A. FIG. A coil portion 2 formed by winding a coil 12 around a coil bobbin 11 is provided on the outer periphery of the iron core 5, and a permanent magnet 13 is provided between the magnetic pole portions 6 at both ends of the iron core 5 formed in a substantially U-shape. Is attached. The electromagnet block 3 is formed from the iron core 5, the coil portion 2, the permanent magnet 13, and the like. This electromagnet block 3 has fixed contact terminals 15
a, together with a common contact terminal 15b and a coil terminal 15c for energizing the coil 12, are formed integrally with the synthetic resin body 14, and the magnetic pole portions 6 at both ends of the iron core 5 are projected on the upper surfaces of both ends of the body 14. is there. In addition, fixed contact terminal 15a
The fixed contacts 1a protruding from both ends of the body 14 protrude from the upper surface of the body 14, and the fixing pieces 16 connected to the common contact terminals 15c are exposed from the upper surface at the center of the body 14.

Reference numeral 18 denotes an amateur.
Contact springs 19 are integrally provided on both sides of a molded product 20 molded in the center of the
Is formed. At the center of each contact spring 19, a hinge spring piece 19a extends.
The movable contacts 1b are provided on the lower surfaces at both ends of the movable contact 1b. A projecting ridge 21 is provided on the lower surface of the molded product 20, and FIG.
The armature block 7 is rotatably mounted on the permanent magnet 13 of the electromagnet block 3 with the ridge 21 as a swing fulcrum, and the hinge spring piece 19a of the contact spring 19 is fixed to the fixing piece 16 as shown in FIG. By doing so, the amateur block 7 is attached, and the contact spring 19 and the common contact terminal 15b are electrically connected. When the amateur block 7 is attached in this manner, the fixed contact 1a and the movable contact 1b are vertically opposed, and the contact portion 1 is formed by the opposed fixed contact 1a and the movable contact 1b.

The cover 22 is made of a synthetic resin and is formed in a box shape having an open lower surface. The body 14 is fitted into the cover 22 and adhered to form the cover 22 and the body 14. It is possible to assemble a sealed relay A in which a relay member such as the electromagnet block 3 or the amateur block 7 is sealed in a housing 4 to be sealed. 24 in the figure is a hole for sealing the inside,
It is a blockage.

Next, the operation of the sealed relay A formed as a polarized relay will be briefly described. First, in a steady state in which energization of the coil 12 is stopped, the permanent magnet 1
The end of the armature 18 opposite to the side where the extension position of the hinge spring piece 19a is shifted by the magnetomotive force of 3 is attracted to the magnetic pole portion 6, and the armature block 7 is inclined as shown in FIG. . In this state, the left contact portion 1 in FIG. 2B is closed and the right contact portion 1 is open. Next, when the coil 12 is energized, the other end of the armature 18 is attracted to the magnetic pole portion 6, and the armature block 7 rotates to move the armature block 7 to the side opposite to the inclination in FIG. Is inclined, and the left contact portion 1 in FIG. 2A is opened and the right contact portion 1 is closed. In this state, the coil 12
Is maintained while power is supplied to the power supply. Next, the coil 12
When the power supply to the armature is stopped, the armature 18 returns to the original steady state against the attraction force between the armature 18 and the magnetic pole portion 6 by the permanent magnet 4 by the spring force of the hinge spring piece 19a. In this manner, the fixed contact 1a and the movable contact 1b of the contact portion 1 are brought into contact open 3 with the rotation of the amateur block 7.
It can be opened and closed.

FIG. 3 shows an example of the sealed switch B. A common terminal 31, a normally open terminal 32, and a normally closed terminal 33 are attached to a body 30 formed of a synthetic resin molded product by simultaneous molding, and a base of a contact spring 34 is attached to an upper portion of the common terminal 31. . A movable contact 1c is fixed to the upper and lower surfaces of the tip of the contact spring 34, and fixed contacts 1d, 1f extend from the normally closed terminal 33 and the normally open terminal 32 so as to face the upper and lower movable contacts 1c, 1c. It is provided in the exposed part. The contact portion 1 is formed by the movable contact 1c and the fixed contacts 1d, 1d, and the switch mechanism 8 is formed by the contact portion 1 and the contact spring 34.

The cover 35 is made of a synthetic resin and formed in a box shape with an open bottom surface. A push button 36 for driving a contact spring 34 is provided through an insertion hole 37 of the cover 35. An elastic cap 38 such as a rubber cap is attached to the insertion hole 37.
8 to seal. 39 is a push button cover. Then, the cover 35 is put on the body 30 and adhered or the like, whereby the sealed switch B in which the switch mechanism 8 is sealed in the housing 4 formed by the body 30 and the cover 35 can be assembled. Reference numeral 40 denotes a dustproof elastic material provided by secondary molding.

In the above-mentioned sealed switch such as the sealed relay A and the sealed switch B, the invention according to claim 1 is characterized in that the sealed housing 4 contains hexamethylene glycol or 2-ethyl-1,3-hexanediol. The lubricant is formed in a vapor phase atmosphere of a polyhydric alcohol. Hexamethylene glycol (also called 1,6-hexanediol) has a molecular formula of C ₆ H ₁₂ (OH) ₂ , a melting point of 42.8 ° C., a boiling point of 208 ° C. (1 atm), and a moisture absorption of 10%.
(40 ° C., 90% RH, 1 atm). 2-ethyl-1,3-hexanediol has a boiling point of 244.2 ° C. (1 atm) and a moisture absorption of 4% (40 ° C., 90 atm).
% RH, 1 atm) and has the following chemical structural formula:

[0019]

Embedded image

As described above, the inside of the housing 4 of the hermetic switch is filled with hexamethylene glycol or 2-ethyl-1,
The contact reliability of the contact portion 1 can be improved by setting the lubricant atmosphere to 3-hexanediol. The mechanism will be described with reference to FIGS. FIG. 5 shows a state in which such a lubricant is not used. Before opening and closing of the contact portion 1, as shown in FIG. 5 (a), organic gas molecules generated from an organic material forming the housing 4 and the like. m ₁ and has water molecules m ₂ is adsorbed on the surface of the contact part 1, a current when the contact part 1 is opened and closed, an arc a is generated as in FIG. 5 (b), the arc a
The organic gas molecules m ₁ adhering to the contact point of the contact portion 1 are carbonized by the energy of the contact portion 1, and as shown in FIG.
Is covered with carbide c. The occurrence of carbides c on the surface of the contact portion 1 causes poor contact of the contact portion 1 and lowers contact reliability.

On the other hand, when the interior of the housing 4 is an atmosphere of a lubricant such as hexamethylene glycol or 2-ethyl-1,3-hexanediol as described above, in addition to the organic gas molecules m ₁ and the water molecules m ₂ , The phase lubricant molecules m ₃ coexist in the housing 4, and these molecules are adsorbed in the form of the surface energy of the contact material, hydrogen bond or secondary bond to the contact surface, etc. The strength of adsorption varies depending on the polarity of the polarities. The lubricant molecule m ₃ of hexamethylene glycol or 2-ethyl-1,3-hexanediol is strongly adsorbed on the surface of the contact portion 1 because of its OH group, and is preferentially adsorbed on the surface of the contact portion 1, as shown in FIG. As described above, the surface of the contact portion 1 is covered with the film of the lubricant molecules m ₃ , and the adhesion of the organic gas molecules m ₁ to the surface of the contact portion 1 can be prevented. Then the arc a is generated during the opening and closing of the contact part 1, when the energy of the lubricant molecules m ₃ to the arc a to adhere to the surface of the contact point of the contact portion 1 acts, hexamethylene glycol and 2-ethyl - 1,
Lubricant molecules m ₃ consisting of 3-hexanediol, chain tends cut because they do not have a benzene ring, yet contains oxygen to aid combustion in a molecule as OH groups, easily combusted with water and carbon dioxide And only a small part is decomposed into low-molecular carbon, and as shown in FIG. 4B, the lubricant molecules m ₃ disappear from the surface of the contact point of the contact portion 2 and the contact portion 1 surface of the contact point is activated by the combustion of the lubricant molecules m _3. The contact point of the contact portion 1 thus activated is provided with a lubricant molecule m having a high adsorbing force.
₄ is preferentially adsorbed, and is again covered with the film of the lubricant molecule m ₃ as shown in FIG. 4C, so that the organic gas molecule m ₁ can be prevented from being adsorbed.

As described above, by forming the interior of the housing 4 in an atmosphere of a lubricant of hexamethylene glycol or 2-ethyl-1,3-hexanediol, the organic gas is prevented from adhering to the surface of the contact portion 1. In addition, when the lubricant is burned by the arc, the lubricant is not decomposed into water and carbon dioxide gas, and the carbide does not adhere to the surface of the contact portion 1. Therefore, it is necessary to perform a degassing process. NO _x due to the combustion of N _{2 in} the air, which is likely to occur with the degassing process, is not generated in the housing 4, and poor contact of the contact portion 1 caused by NO _x can be prevented. You can do it. Also, hexamethylene glycol or 2-ethyl-
1,3-Hexanediol has high lubricity and can effectively prevent sticking from fusing when the contacts are rubbed by minute vibration.

Here, hexamethylene glycol is solid at room temperature, and 2-ethyl-1,3-hexanediol has a high viscosity at room temperature, and neither is a liquid that is easy to use. Therefore, in the invention of claim 3, hexamethylene glycol and / or 2-ethyl-1,3-hexanediol are dissolved in hexylene glycol so that they can be used as an easy-to-use liquid. Hexylene glycol, which is used as a solvent, itself has a lubricating effect similar to hexamethylene glycol and 2-ethyl-1,3-hexanediol, and further enhances the effect of protecting the contact portion 1 described above. You can get high. As this hexylene glycol, it is preferable to use 2-methyl-2,4-pentanediol, and the amount of hexamethylene glycol or 2-ethyl-1,3-hexanediol added to hexylene glycol is based on hexylene glycol. It can be arbitrarily set within a range in which hexamethylene glycol or 2-ethyl-1,3-hexanediol is dissolved.

As described above, when hexamethylene glycol or 2-ethyl-1,3-hexanediol is used after being dissolved in hexylene glycol, hexamethylene glycol or 2-ethyl-1,3-hexanediol is converted into hexylene glycol. In the case of only mixing with glycol, the initial adhesion to the contact portion 1 occurs excessively, and the above-mentioned effect may be rather unstable. Therefore, in the invention of claim 3, hexamethylene glycol and / or 2-ethyl-1,3-hexanediol are mixed with hexylene glycol and further mixed with anthraquinone, anthraquinone-based dye, naphthoquinone, naphthoquinone derivative,
By mixing a substance selected from perinaphthalone and perinaphthalone-based dye, the initial adhesion to the contact portion 1 is suppressed from becoming excessive, and the effect can be stably obtained.

Specific examples of anthraquinone dyes include “CI Solvent Red 105”,
“CI Solvent Red 111”, “C.I.
I. Solvent Red 143 "," CIS
solvent Blue 21 "," CI Solv "
ent Blue 35 "," CI Solvent "
Blue 36 "," CI Solvent Blu "
e45 "," CI Solvent Blue 9 "
3 "," CI Smoke Dye (Orange)
e) "," CI Pigment Violet 1 "
2 ". Specific examples of perinaphthalone-based dyes include" Sumiplast O "manufactured by Sumitomo Chemical Co., Ltd.
range HRP "," CI Solvent R "
ed 150 ".

Further, in the invention of claim 4, hexamethylene glycol and / or 2-ethyl-1,3-hexanediol are dissolved in ethyl alcohol and polypropylene glycol so that they can be used as an easy-to-use liquid. . Ethyl alcohol has the effect of lowering the viscosity of the mixture to increase workability during mixing, but evaporates quickly after mixing. On the other hand, since the polypropylene glycol hardly evaporates, the mixed solution can always be kept in a liquid state even when the ethyl alcohol evaporates. Polypropylene glycol has a molecular weight (Mw) of 400-
4000 is preferable since it has almost no hygroscopicity or evaporation. The mixing amount at the time of mixing is not particularly limited. One example is hexamethylene glycol and / or 2-ethyl-1,3-hexanediol.
5% by weight, 45% by weight of ethyl alcohol and 10% by weight of polypropylene glycol.

As described above, by using ethyl alcohol and polypropylene glycol in combination as a solvent, the workability at the time of mixing can be improved and the ease of use as a liquid can be maintained. Moreover, polypropylene glycol itself is hexamethylene glycol or 2
-Ethyl-1,3-hexanediol has the same effect as a lubricant as hexylene glycol, and the effect of protecting the contact portion 1 can be further enhanced.

According to a fifth aspect of the present invention, the inside of the housing is formed in a gaseous atmosphere of a lubricant using hexamethylene glycol and 2-ethyl-1,3-hexanediol in combination. When hexamethylene glycol and 2-ethyl-1,3-hexanediol are used in combination as described above, since the two have different evaporation rates, the lubricating effect can be maintained for a long period of time, and the life of the closed switch can be extended. Can be achieved.

In order to form the inside of the housing 4 into the above-described atmosphere of the lubricant, the lubricant can be filled in the housing 4 in a gaseous state in advance. For example, the housing 4 can be filled with a gaseous lubricant by heating the lubricant into a gaseous state and pressing the lubricant into the housing 4 while expelling the internal air. By filling the lubricant in the housing 4 in the gaseous state as described above, the concentration of the lubricant in the housing 4 can be made uniform, and the contact of the contact portion due to the variation in the concentration of the lubricant in the housing 4 can be achieved. Variations in effects such as improvement in reliability can be reduced.

The housing 4 can be formed in an atmosphere of a lubricant by putting the above-mentioned lubricant into the housing 4 in a liquid state. For example, by applying a liquid lubricant to the inner surfaces of the covers 22 and 35 of the housing 4, the lubricant can be put into the housing 4. FIG. 6 shows an example of application of the lubricant 10 to the inner surfaces of the covers 22 and 35. After the lubricant 10 is attached to the lower end of the contact pin 26 as shown in FIG.
As shown in FIGS. 6B and 6C, the lubricant 1 is applied to the inner surface of the cover 22.
0 is transferred from the contact pin 26 to perform coating. When the lubricant in the liquid state is introduced into the housing 4, the lubricant gradually evaporates in the housing 4 and fills the housing 4 for a long time, thereby improving the contact reliability of the contact portion. And the like can be maintained for a long period of time.

Further, by putting the above-mentioned lubricant into the housing 4 in a solid state, the inside of the housing 4 can be formed in an atmosphere of a lubricant. The lubricant in the solid state can be easily arranged at a required position in the housing 4.
It is easy to incorporate into the inside. When the lubricant is in a liquid state, a porous body such as a sponge may contain the lubricant so that the same handling as in the solid state can be performed.

Here, a relay member formed by pivotally supporting an armature block 7 so as to abut against and repel the magnetic pole portion 6 of the iron core 5 as shown in FIGS. In the sealed relay A, the lubricant is gaseous or liquid as described above,
Alternatively, when the housing 4 is put in a solid state and the interior of the housing 4 is made to have a lubricant atmosphere, the vaporized lubricant wraps around the support portion of the armature block 7, for example, the ridge 21, and generates a thin film of the lubricant molecules to form the armature block. 7 can be smoothly rotated. Also, a thin film of vaporized lubricant molecules is formed between the magnetic pole portion 6 of the iron core 5 and the armature 18, so that wear caused by opening and closing of the magnetic pole portion 6 and the armature 18 can be reduced.

The substances constituting the lubricants according to the first to fifth aspects can be used alone or in combination of one or more.

[0034]

As described above, according to the first aspect of the present invention, there is provided a sealed switch in which a contact portion is housed in a housing in a sealed manner.
Since the interior of the housing is formed in a lubricant atmosphere composed of a polyhydric alcohol selected from hexamethylene glycol and 2-ethyl-1,3-hexanediol,
Hexamethylene glycol and 2-ethyl-1,3-hexanediol have a strong polarity due to their OH groups, and are adsorbed on the surface of the contact portion in preference to the organic gas, and molecules of the organic gas adhere to the surface of the contact portion. Can prevent the organic gas from protecting the contact portion from the organic gas.In addition, since these have oxygen as an OH group in the molecular structure, the combustion efficiency is good, and the carbide is formed on the surface of the contact portion. This does not remain, and the contact reliability of the contact portion can be improved. In addition, hexamethylene glycol and 2-ethyl-1,3-hexanediol have high lubricity and can prevent sticking from fusing when the contacts are rubbed by minute vibration. is there.

According to a second aspect of the present invention, the above-mentioned hexamethylene glycol or 2-ethyl-1,3-hexanediol is dissolved in hexylene glycol for use. , 3
-Hexanediol can be used in an easy-to-use liquid state, and the effect of contact reliability of the contact portion can be further enhanced by hexylene glycol.

The invention of claim 3 is to dissolve the above-mentioned hexamethylene glycol or 2-ethyl-1,3-hexanediol in hexylene glycol and further add anthraquinone, anthraquinone dye, naphthoquinone, naphthoquinone derivative, perinaphthalone Since perinaphthalone-based dyes are mixed and used, it is possible to suppress the initial adhesion to the contact portion from becoming excessive, and to stably obtain the effect.

According to a fourth aspect of the present invention, the above-mentioned hexamethylene glycol or 2-ethyl-1,3-hexanediol is dissolved in ethyl alcohol and polypropylene glycol for use. In addition, it is possible to enhance the workability at the time of mixing and maintain the ease of use as a liquid,
Moreover, the effect of the contact reliability of the contact portion can be further enhanced by the polypropylene glycol.

According to a fifth aspect of the present invention, in the hermetic switch in which the contact portion is sealed and housed in the housing, the interior of the housing is formed in an atmosphere of a lubricant composed of hexamethylene glycol and 2-ethyl-1,3-hexanediol. Hexamethylene glycol and 2-ethyl-
When 1,3-hexanediol is used in combination, the lubricating effect can be maintained for a long time, and the effect of improving the contact reliability of the contact portion can be obtained for a long time.

According to a sixth aspect of the present invention, in a sealed relay in which an electromagnet block having a contact portion and a coil portion is housed in a housing in a sealed manner, the interior of the housing is formed in the above-described lubricant atmosphere. A sealed relay having high contact reliability can be obtained. According to a seventh aspect of the present invention, in a sealed switch in which a switch mechanism such as a contact portion is sealed and housed in a housing, the inside of the housing is formed in an atmosphere of the lubricant, so that contact reliability of the contact is high. A sealed switch can be obtained.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing an example of an embodiment using a sealed relay of the present invention.

FIG. 2 shows an example of an embodiment using a sealed relay of the present invention, wherein (a) is a front view in which a cover is cut,
(B) is a front view in which a part of the cover and the electromagnet block is cut, and (c) is a schematic front view of the electromagnet block and the amateur block.

FIG. 3 is a sectional view showing an example of an embodiment using a sealed switch of the present invention.

FIGS. 4A and 4B show the state of the surface of the contact portion when the contact is opened and closed in the present invention, and FIGS. 4A, 4B, and 4C are schematic diagrams.

FIGS. 5A and 5B show the state of the surface of the contact portion when the contact is opened and closed in the related art, and FIGS. 5A, 5B, and 5C are schematic diagrams, respectively.

FIG. 6 shows the application of a lubricant to a cover;
(A), (b), (c) is a schematic diagram showing a procedure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Contact part 2 Coil part 8 Switch mechanism A Sealed relay B Sealed switch

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kazuhiro Shinnogi 1048 Kadoma Kadoma, Osaka Pref.Matsushita Electric Works, Ltd. Inventor Tomoyoshi Hayashi 1048 Kazuma Kadoma, Kadoma City, Osaka Pref.Matsushita Electric Works, Ltd. 1006 Oaza Kadoma Matsushita Electric Industrial Co., Ltd.

Claims (7)

[Claims] 1. A sealed switchgear in which a contact portion is sealed and housed in a housing, wherein the inside of the housing is exposed to an atmosphere of a lubricant comprising a polyhydric alcohol selected from hexamethylene glycol and 2-ethyl-1,3-hexanediol. A hermetic switch characterized by being formed. 2. The hermetic switch according to claim 1, wherein the polyhydric alcohol is dissolved in hexylene glycol for use. 3. The polyhydric alcohol is dissolved in hexylene glycol, and further anthraquinone,
3. The hermetic switch according to claim 2, wherein a mixture selected from an anthraquinone dye, naphthoquinone, a naphthoquinone derivative, perinaphthalone, and a perinaphthalone dye is used. 4. The hermetic switch according to claim 1, wherein said polyhydric alcohol is dissolved in ethyl alcohol and polypropylene glycol for use. 5. A sealed switch in which a contact portion is sealed and housed in a housing, wherein the interior of the housing is formed in an atmosphere of a lubricant composed of hexamethylene glycol and 2-ethyl-1,3-hexanediol. Sealed switchgear characterized. 6. The sealed switch according to claim 1, wherein the relay is a hermetically sealed relay in which an electromagnet block having a contact portion and a coil portion is housed in a housing in a sealed manner. 7. The sealed switch according to claim 1, wherein the switch is a sealed switch in which a switch mechanism such as a contact portion is sealed in a housing.