JPH1092252A - Sealed switching device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the contact reliability of a contact in a switching device such as a sealed relay and a sealed switch. SOLUTION: In a sealed switching device in which a contact part is sealed and housed in a housing 4, the inside of the housing 4 is formed in the atmosphere of a lubricant made of polyhydric alcohol having a plurality of OH groups. Lubricant molecules of polyhydric alcohols have strong polarity and are adsorbed on the surface of the contact part 1 prior to organic gas molecules, the surface of the contact part 1 is covered with the film of the lubricant molecules of polyhydric alcohols, and adsorption of the organic gas molecules to the surface of the contact part 1 is prevented.

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 When a corrosive gas enters the inside of a relay from the outside, the contacts and the like of the relay mechanism are adversely affected by the corrosive gas, so that the relay mechanism is sealed in a housing. 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 switch in which a contact portion is sealed and housed in a housing, wherein the polyhydric alcohol having a plurality of --OH groups in the housing. It is characterized in that it is formed in an atmosphere of a lubricant made of any of the following. The invention according to claim 2 is characterized in that the polyhydric alcohol is 2-methyl-2,
It is characterized by using 4-pentanediol.

The invention according to claim 3 is characterized in that a mixture of 2-methyl-2,4-pentanediol and 1,4-butanediol is used as the polyhydric alcohol. The invention of claim 4 is characterized in that a mixture of 2-methyl-2,4-pentanediol and glycerin is used as the polyhydric alcohol.

In a sealed switch according to a fifth aspect of the present invention, in the sealed switch having a contact portion sealed and housed in a housing, the interior of the housing is formed in an atmosphere of a lubricant composed of ethers having -O- bonds. It is characterized by comprising. The sealed switch according to claim 6 of the present invention is a sealed switch in which the contact portion is sealed in the housing and accommodated in a housing of a lubricant containing ether alcohol having an -OH group and an -O- bond in the housing. It is characterized by being formed in.

Further, the invention of claim 7 is characterized in that a 1-mol propylene oxide adduct of 2-methyl-2,4-pentanediol is used as the ether alcohol. The invention of claim 8 is characterized in that the housing is filled with the lubricant in a gaseous state.

According to a ninth aspect of the present invention, the lubricant is put into the housing in a liquid state. According to a tenth aspect of the present invention, the lubricant is accommodated in a housing in a solid state. The invention of claim 11 provides:
A sealed switch is formed by a sealed relay containing an electromagnet block having a contact portion and a coil portion in a housing.

According to a twelfth aspect of the present invention, a relay member formed by rotatably supporting an armature block so as to abut against and repel a magnetic pole portion of an iron core is hermetically sealed by a hermetically sealed relay housed in a housing. It is characterized in that a switch is formed. According to a thirteenth aspect of the present invention, the hermetic switch is formed by a hermetic switch in which a switch mechanism such as a contact portion is housed in a housing.

[0014]

Embodiments of the present invention will be described below. FIGS. 1 and 2 show an example of the structure of the sealed relay A. A coil portion 2 formed by winding a coil 12 around a coil bobbin 11 is provided on the outer periphery of an iron core 5 and has a substantially U-shape. A permanent magnet 13 is attached between the magnetic pole portions 6 at both ends of the iron core 5 to be formed. 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.

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 bottom 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 will be blocked.

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 way, the fixed contact 1a and the movable contact 1b of the contact section 1 can be opened and closed by contacting and separating the movable contact 1b with the rotation of the amateur block 7.

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 is formed in a box shape having 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 invention according to claim 1 of the present invention,
In the sealed switch such as the sealed relay A and the sealed switch B as described above, a plurality of -O
It is formed in an atmosphere of a lubricant made of a polyhydric alcohol having an H group. Examples of the polyhydric alcohols include ethylene glycol such as ethane-1,2-diol, propylene glycol such as propane-1,2-diol, and 2-methyl-2,4-pentanediol. 1)) hexylene glycol, such as
Glycerin and the like can be used.

[0021]

Embedded image

As described above, by making the inside of the housing 4 of the hermetic switchgear the atmosphere of the lubricant made of polyhydric alcohol, the contact reliability of the contact portion 1 can be improved. A description will be given based on FIG. 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. 5A, generated from an organic material constituting the coil portion 2, the housing 4, and the like. The organic gas molecules m ₁ and the water molecules m ₂ are adsorbed on the surface of the contact portion 1, and when the arc a is generated as shown in FIG. The organic gas molecules m ₁ attached to the contact point of the contact portion 1 are carbonized by the energy of the arc a, and the surface of the contact portion 1 is covered with the carbide c as shown in FIG. The generation of carbide c on the surface of contact portion 1 allows contact portion 1
And the contact reliability is reduced.

On the other hand, if the interior of the housing 4 is in an atmosphere of a lubricant made of polyhydric alcohols as described above, the gas phase lubricant molecules m _{3 in} addition to the organic gas molecules m ₁ and the water molecules m ₂ are not included. These molecules coexist, and these molecules are adsorbed in the form of surface energy possessed by the contact material, hydrogen bonds or secondary bonds to the contact surface, etc. Different in strength. Then, since the lubricant molecule m ₃ of polyhydric alcohol has a strong polarity due to its hydroxyl group, it is preferentially adsorbed on the surface of the contact portion 1 and FIG.
As shown in (a), the surface of the contact portion 1 is covered with a film of the lubricant molecule m ₃ , and the surface of the contact portion 1 has an organic gas molecule m 3.
₁ can be prevented from adhering. 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, lubricant molecules m ₃ polyvalent Since it is composed of alcohols, the lubricant molecule m ₃ is burned and decomposed into water and carbon dioxide gas, and only a small part is decomposed into low molecular carbon, and as shown in FIG. The lubricant molecules m ₃ disappear from the surface of the contact point, and the surface of the contact point of the contact portion 1 is activated by the combustion of the lubricant molecules m ₃ . At the contact point of the contact portion 1 activated in this way, the lubricant molecule m ₃ having a high adsorptivity is preferentially adsorbed, and is again covered with the film of the lubricant molecule m ₃ as shown in FIG. Thus, it is possible to prevent the organic gas molecules m _{1 from} being adsorbed.

As described above, by forming the inside of the housing 4 in an atmosphere of a lubricant made of polyhydric alcohols,
The organic gas can be prevented from adhering to the surface of the contact portion 1, and when the polyhydric alcohol is burned by the arc, it is decomposed into water and carbon dioxide gas and the carbide is removed.
Does not adhere to the surface of the contact portion 1, and it is possible to prevent the occurrence of poor contact of the contact portion 1 due to the arc at the time of opening and closing.

In the present invention, it is preferable to use 2-methyl-2,4-pentanediol among the above-mentioned polyhydric alcohols (claim 2). Since 2-methyl-2,4-pentanediol has no benzene ring, the chain is easily broken, and since it has a side chain having a weaker bonding force than the main chain as a methyl group, it is easily thermally decomposed. As a base, it contains oxygen that assists combustion in the molecule, and has good combustion efficiency and is easy to completely burn. Therefore, the carbide is not easily decomposed by the energy of the arc and the carbide does not remain on the surface of the contact portion 1, and the effect of preventing the occurrence of the contact failure of the contact portion 1 can be enhanced.

The above-mentioned 2-methyl-2,4-pentanediol can be used in a mixture with 1,4-butanediol (claim 3). 1,4-Butanediol, like 2-methyl-2,4-pentanediol, does not have a benzene ring and thus is apt to break its chain, and contains oxygen as an OH group in the molecule to assist combustion. It is a substance with good efficiency and easy to burn completely. Further, since 2-methyl-2,4-pentanediol has a high evaporation rate, there is a problem in maintaining the effect of preventing the occurrence of poor contact of the contact portion 1, while 1,4-butanediol has a problem. Due to the slow evaporation rate, this effect is long lasting.
-Butanediol has a problem of high hygroscopicity.
Therefore, 2-methyl-2,4-pentanediol and 1,1
By mixing and using 4-butanediol, the sustained effect and the hygroscopicity can be mutually complemented. The mixing ratio of 2-methyl-2,4-pentanediol and 1,4-butanediol is 2% by weight.
-Methyl-2,4-pentanediol: 1,4-butanediol = 1: 4 to 7: 1 is preferred. 1: 4 is the limit of hygroscopicity and 7: 1 is the limit of persistence.

Further, the above-mentioned 2-methyl-2,4-pentanediol can be used by mixing with glycerin (claim 4). Glycerin, like 2-methyl-2,4-pentanediol, does not have a benzene ring and thus is easily broken, and contains oxygen as an OH group in the molecule to help combustion. It is a substance that easily burns. The mixing ratio of 2-methyl-2,4-pentanediol and glycerin is 2-methyl-2,4
-It is preferable to set pentanediol in the range of 50 to 98% by weight and glycerin in the range of 50 to 2% by weight. If the amount of 2-methyl-2,4-pentanediol is less than 50% by weight, 2-methyl-2,4-pentanediol becomes an azeotrope with glycerin having a high boiling point (boiling point: 290 ° C.) There is a possibility that the effect of preventing the occurrence of contact failure of the contact portion 1 may be reduced due to a decrease in suction to the portion 1. Conversely, 2-
If the content of methyl-2,4-pentanediol exceeds 98% by weight, the contact point 1 is reduced because 2-methyl-2,4-pentanediol (boiling point: 198 ° C.) having a low boiling point has a high evaporation rate.
It is difficult to maintain the effect of preventing the occurrence of poor contact for a long time.

Next, according to the invention of claim 5, in the sealed switch such as the sealed relay A and the sealed switch B as described above, one or a plurality of -O-
It is formed in an atmosphere of a lubricant made of ethers having a bond. As the ethers, dimethyl ether, diethyl ether, methyl ethyl ether and the like can be used.

Since the ether molecules have a strong polarity due to the presence of the ether bond, similar to the case of the above-mentioned polyhydric alcohols, the film is formed by adsorbing on the surface of the contact portion 1 preferentially over the organic gas. However, it is possible to prevent the molecules of the organic gas from adhering to the surface of the contact portion 1, and furthermore, the ethers have good combustion efficiency, and no carbide remains on the surface of the contact portion 1. The contact reliability can be improved.

According to a sixth aspect of the present invention, in the sealed switch such as the sealed relay A or the sealed switch B, one or a plurality of OHs are sealed in the sealed housing 4.
It is formed in a lubricant atmosphere of ether alcohols having a group and one or more -O- bonds. As the ether alcohols, diethylene glycol, ethylene glycol monoethyl ether,
Ethylene glycol monobutyl ether or the like can be used.

Since ether alcohols have a strong polarity due to the presence of an ether bond and a hydroxyl group, similarly to the case of the above-mentioned polyhydric alcohols, the alcohol adsorbs on the surface of the contact portion 1 preferentially over the organic gas to form a film. It can prevent the organic gas molecules from adhering to the surface of the contact portion 1 by forming, and have an ether bond and a hydroxyl group of a side chain, so that the combustion efficiency is good and the carbide remains on the surface of the contact portion 1. Such a situation is eliminated, and the contact reliability of the contact portion 1 can be improved. As described above, the ether alcohol is preferentially adsorbed on the surface of the contact portion 1 over the organic gas, and is completely burned, so that no carbide remains on the surface of the contact portion 1. Therefore, it is not necessary to perform the degassing treatment. NO _x due to the combustion of N _{2 in} the air, which tends to be generated by performing the gas treatment, is not generated in the housing 4,
The contact failure of the contact portion 1 caused by NO _x can be prevented. Furthermore, the gas molecules of ether alcohols are randomly attached to the surface of the contact portion 1 to form a uniform film as a whole, and even in the case of a DC capacity load, the arc flies to various places and the arc points are concentrated at one point. The wear due to the arc is evenly performed on the surface of the contact portion 1, and the occurrence of the transfer phenomenon can be prevented.

As the ether alcohols, those exemplified above can be used. In addition to these, 1-mol propylene oxide adduct of hexylene glycol can be used. Hexylene glycol has a low hygroscopicity among crycols, so that moisture is less attracted into the housing 4, and the contact portion 1, the electromagnet block 3, and the switch mechanism 8 are exposed to moisture in the housing 4.
It is possible to prevent corrosion of metal parts such as.

The hexylene glycol 1 mol propylene oxide adduct is a 2-methyl-2,4-pentanediol isopropylene oxide 1 mol adduct represented by the following chemical structural formula. It is preferably used (claim 7).

[0034]

Embedded image

The propoxylated alkylene diol represented by the above formula (2) is a slightly yellow liquid in appearance and has a specific gravity of 0.960 (a
(t20 ° C.), viscosity 91.4 cst (at 20 ° C.), flash point 112 to 116 ° C., freezing point −30 ° C., boiling point 265 ° C., having no ignitability, oxidation, self-reactivity, or explosiveness. And since it does not have a benzene ring, the chain is easily broken, and furthermore, it has a side chain having a weaker bonding force than the main chain as a methyl group, so it is easily thermally decomposed, and further burns in the molecule as an OH group. It contains oxygen to help and has good combustion efficiency and is easy to burn completely. Therefore, the carbide is not easily decomposed by the energy of the arc and the carbide does not remain on the surface of the contact portion 1, and the effect of preventing the occurrence of the contact failure of the contact portion 1 can be enhanced.

The housing 4 can be formed into a lubricant atmosphere by filling the housing 4 with the lubricant composed of the above-mentioned polyhydric alcohols, ethers, and ether alcohols in a gaseous state in advance. (Claim 8). 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 housing 4 with a lubricant in a gas state as described above, the housing 4
It is possible to make the concentration of the lubricant inside the housing 4 uniform, and to reduce the variation in the effect such as the improvement in the contact reliability of the contact portion due to the variation in the concentration of the lubricant in the housing 4.

Further, by introducing a lubricant composed of polyhydric alcohols, ethers, and ether alcohols into the housing 4 in a liquid state, the interior of the housing 4 can be formed in an atmosphere of a lubricant. ). For example, by applying a liquid lubricant to the inner surface of the cover 22 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 surface of the cover 22.
After the lubricant 10 is applied to the lower end of the cover 6 as shown in FIG. 6A, the lubricant 10 is transferred from the contact pins 26 to the inner surface of the cover 22 as shown in FIGS. I do it. When the lubricant in a liquid state is introduced into the housing 4 as described above, the lubricant gradually evaporates in the housing 4 and fills the housing 4 for a long time.
The effect of improving the contact reliability of the contact portion can be maintained for a long time.

When the lubricant is applied to the housing 4 as described above, the lubricant shown in Chemical Formula 2 is used, and the lubricant is applied to the sealed relay A having a capacity of about 150 mm ^{3 in} the housing 4. , Small CR load high temperature (8
FIG. 7 shows the measurement results of the contact reliability of the contacts when the contacts are opened and closed (about 0 ° C.). FIG. 7 is a graph showing the relationship between the number of tests (the number of times the contacts are opened and closed) of the sealed relay A and the number of defective contacts.
FIG. 7A shows the result when no lubricant is applied, and FIG.
7 (b) shows the result when 0.1 μl of the lubricant was applied, FIG. 7 (c) shows the result when 0.3 μl of the lubricant was applied, and FIG. 7 (d) shows the result when 0.5 μl of the lubricant was applied. FIG. 7 (e) shows the result when liter application was performed, and FIG. 7 (e) shows the result when 1.0 μl lubricant was applied. It should be noted that a contact resistance (CR)> 100 mΩ was judged as a defective contact. As shown in FIGS. 7A and 7B, it is confirmed that the contact reliability of the contact is greatly improved by applying 0.1 μl of the lubricant as compared with the case where the lubricant is not applied. Further, as shown in FIGS. 7 (c), (d) and (e), by applying a lubricant of 0.3 μl or more, a defective contact does not occur, and the application of the lubricant is 0.3 μl.
Liters seem to be sufficient. Therefore, although not particularly limited, the application amount of the lubricant is 0.1 to
A range of 0.3 μl is preferred.

Further, by introducing a lubricant composed of polyhydric alcohols, ethers, and ether alcohols into the housing 4 in a solid state, the interior of the housing 4 can be formed in a lubricant atmosphere. ). As described above, the solid-state lubricant is easily disposed at a required place in the housing 4 and is easily incorporated into the housing 4. When the lubricant is in a liquid state, the 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 rotatingly supporting an armature block 7 so as to contact 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 (claim 12), the vaporized lubricant goes around the support portion of the amateur block 7, for example, the ridge 21, and a thin film of the lubricant molecules is formed. This allows the amateur block 7 to rotate smoothly. 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.

[0041]

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 inside of the housing is formed in an atmosphere of a lubricant composed of polyhydric alcohols having a plurality of -OH groups,
The lubricant molecules of polyhydric alcohols have a strong polarity and are adsorbed on the surface of the contact portion in preference to the organic gas molecules, and the surface of the contact portion is covered with a film of the lubricant molecule of polyhydric alcohol and the surface of the contact portion Can prevent organic gas molecules from adhering to the surface, and can prevent contact failure due to carbonization of organic gas molecules by an arc at the time of opening and closing, and improve the contact reliability of the contacts Is what you can do.

Further, in the invention of claim 2, 2-methyl-2,4-pentanediol is used as the polyhydric alcohol, so that 2-methyl-2,4-pentanediol has a benzene ring. Since it does not have it, it is easy to break the chain, and it has a side chain with a weaker bonding force than the main chain as a methyl group, so it is easily thermally decomposed, and further contains oxygen that helps combustion in the molecule as an OH group. It has good efficiency and is easy to burn completely, and it is not easily decomposed by the energy of the arc so that carbides do not remain on the surface of the contact portion, and it is possible to obtain a high effect of contact reliability of the contact. Things.

The invention according to claim 3 is characterized in that 2-methyl-2,4-pentanediol and 1,4 are used as polyhydric alcohols.
Since the mixture of butanediol is used, the effect of enhancing the contact reliability of the contact can be maintained for a long time. According to the invention of claim 4, since a mixture of 2-methyl-2,4-pentanediol and glycerin is used as the polyhydric alcohol, the effect of increasing the contact reliability of the contact can be maintained for a long time. It is.

According to a fifth aspect of the present invention, in the hermetically sealed switch in which the contact portion is sealed in the housing, the interior of the housing is formed in an atmosphere of a lubricant composed of ethers having an -O- bond. The lubricant molecules of ethers are strong in polarity, and are adsorbed on the surface of the contact part in preference to the organic gas molecules. It is possible to prevent molecules from adhering, and ethers have good combustion efficiency and are easy to burn completely. The contact reliability of the contact can be improved.

According to a sixth aspect of the present invention, in the hermetic switch having the contact portion sealed and housed in the housing, the interior of the housing is formed in an atmosphere of a lubricant comprising an ether alcohol having an -OH group and an -O- bond. I decided to
The lubricant molecules of ether alcohols have a strong polarity and are adsorbed on the surface of the contact portion in preference to the organic gas molecules, and the surface of the contact portion is covered with a film of the lubricant molecule of ether alcohols to form an organic layer on the surface of the contact portion. It can prevent gas molecules from adhering, and can prevent contact failure due to carbonization of organic gas molecules due to arc at opening and closing, and improve contact reliability of contacts. You can do it. In addition, ether alcohols have high combustion efficiency, so there is no need to perform degassing, NO _x is not generated in the housing, and the contact reliability of the contacts can be further improved. Kinds of molecules are randomly attached to the surface of the contact portion, so that even in the case of a DC capacitive load, the concentration of arc points is eliminated and the occurrence of a transition phenomenon can be prevented.

Further, in the invention of claim 7, since 1 mole of propylene oxide adduct of 2-methyl-2,4-pentanediol is used as the ether alcohol, this product has no benzene ring. The chain is easily broken, and has a side chain with a weaker bonding force than the main chain as a methyl group, so it is easily thermally decomposed.In addition, it contains oxygen as an OH group that helps combustion in the molecule, and the combustion efficiency is good. It is easily burnt completely, does not easily decompose by the energy of the arc, and does not leave carbide on the surface of the contact portion, so that the contact reliability of the contact can be highly enhanced. Moreover, 2-methyl-2,4
-Pentanediol has a lower hygroscopicity than other glycols, can reduce the hygroscopicity in the atmosphere of the housing, and can prevent corrosion of the contact points and metal parts.

According to the eighth aspect of the present invention, since the lubricant is filled in the housing in a gaseous state, the concentration of the lubricant in the housing can be made uniform, and the lubricant in the housing can be made uniform. It is possible to reduce the variation in the effect of improving the contact reliability of the contact due to the variation in the concentration. According to the ninth aspect of the present invention, since the lubricant is put into the housing in a liquid state, the lubricant gradually evaporates in the housing and fills the housing for a long time. The effect of improving the contact reliability can be maintained for a long time.

According to the tenth aspect of the present invention, since the lubricant is accommodated in the housing in a solid state, the lubricant in the solid state can be easily arranged at a required place in the housing.
Some are easier to incorporate into the housing. According to the eleventh aspect of the present invention, in a sealed relay in which an electromagnet block having a contact portion and a coil portion is sealed and housed in a housing, the inside of the housing is formed in the above-described lubricant atmosphere. A highly sealed relay can be obtained.

According to a twelfth aspect of the present invention, there is provided a sealed relay wherein a relay member formed by rotatably supporting an armature block so as to abut against and repel a magnetic pole portion of an iron core is hermetically housed in a housing. Since the inside is formed in the atmosphere of the above-described lubricant, a thin film of vaporized lubricant molecules is generated in the support portion of the amateur block so that the rotation of the amateur block can be performed smoothly, Further, a thin film of vaporized lubricant molecules is formed between the magnetic pole portion of the iron core and the armature, thereby reducing wear caused by opening and closing of the magnetic pole portion and the armature.

According to a thirteenth 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 improved. A highly reliable 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.

FIGS. 7A and 7B show the relationship between the number of test times of the sealed relay and the number of defective contacts, where FIG. 7A is a graph when no lubricant is applied, and FIG. 7B is a graph when 0.1 μL of the lubricant is applied. Graph, (c) is a graph when 0.3 μl of lubricant is applied, (d) is a graph when 0.5 μl of lubricant is applied, and (e) is a graph when 1.0 μl of lubricant is applied. It is a graph of.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Contact part 2 Coil part 3 Electromagnet block 4 Housing 5 Iron core 6 Magnetic pole part 7 Amateur block 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 Tomoya Hayashi 1048 Kadoma, Kazuma, Osaka Prefecture, Matsushita Electric Works, Ltd. 1048, Kazumasa, Kazumasa-shi, Matsushita Electric Works, Ltd. (72) Inventor Masahiko Sawa 1048, Kadoma, Kazumasa, Kadoma, Osaka

Claims (13)

[Claims] 1. 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 polyhydric alcohols having a plurality of -OH groups. Sealed switch. 2. The method according to claim 1, wherein the polyhydric alcohol is 2-methyl-2,4.
2. The hermetic switch according to claim 1, wherein the hermetic switch is pentanediol. 3. The method according to claim 1, wherein the polyhydric alcohol is 2-methyl-2,4.
The hermetic switch according to claim 1, wherein the hermetic switch is a mixture of pentanediol and 1,4-butanediol. 4. The method according to claim 1, wherein the polyhydric alcohol is 2-methyl-2,4.
2. The hermetic switch according to claim 1, wherein the hermetic switch is a mixture of pentanediol and glycerin. 5. A sealed switch in which a contact portion is sealed and housed in a housing, wherein the inside of the housing is formed in an atmosphere of a lubricant composed of ethers having an -O- bond. . 6. A sealed switchgear in which a contact portion is sealed and accommodated in a housing.
A sealed switch formed in an atmosphere of a lubricant composed of ether alcohols having a bond. 7. The method according to claim 7, wherein the ether alcohol is 2-methyl-
7. The hermetic switch according to claim 6, which is a propylene oxide 1 mol adduct of 2,4-pentanediol. 8. A sealed switch characterized by filling the housing with the lubricant according to claim 1 in a gaseous state. 9. A hermetic switch, wherein the lubricant according to claim 1 is put into a housing in a liquid state. 10. A hermetically sealed switch, wherein the lubricant according to claim 1 is contained in a solid state in a housing. 11. The sealed switch according to claim 1, wherein the sealed switch is a sealed relay in which an electromagnet block having a contact portion and a coil portion is housed in a housing. 12. A sealed relay, wherein a relay member formed by rotatably supporting an armature block so as to abut against and repel a magnetic pole portion of an iron core is hermetically sealed and housed in a housing. The sealed switch according to any one of 1 to 10. 13. 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 housed in a housing.